Noise Shaping for high rez files and streams
 

I've continued to think about ways to reduce the excess 'sea of noise bits'
that tend to occuply the least significant bits per sample of 'high rez'
streams and files. These tend to bloat FLACing, etc, so waste space, money,
time, etc. Occurred to me that Noise Shaping down the sample size whilst
keeping the high sample rate might help. So I did some simple experiments.

If anyone is interested you can see the results at

http://www.audiomisc.co.uk/MQA/intos...ngHighRez.html

All being well, I'll put up a tidied version of the demo program as well in
case any computer programmers want to have a play with it.

Jim

--
Please use the address on the audiomisc page if you wish to email me.
Electronics http://www.st-and.ac.uk/~www_pa/Scot...o/electron.htm
Armstrong Audio http://www.audiomisc.co.uk/Armstrong/armstrong.html
Audio Misc http://www.audiomisc.co.uk/index.html

Noise Shaping for high rez files and streams
 

In the very start of digital some recordings looked fantastic on specs but
sounded crap, seeming like they had some kind of noise gate on them. then
came dither, which made recordings sound right again. I'll just leave this
hanging there....
Brian

--
From the Sofa of Brian Gaff Reply address is active
Remember, if you don't like where I post
or what I say, you don't have to
read my posts! :-)
"Jim Lesurf" wrote in message
...
I've continued to think about ways to reduce the excess 'sea of noise
bits'
that tend to occuply the least significant bits per sample of 'high rez'
streams and files. These tend to bloat FLACing, etc, so waste space,
money,
time, etc. Occurred to me that Noise Shaping down the sample size whilst
keeping the high sample rate might help. So I did some simple experiments.

If anyone is interested you can see the results at

http://www.audiomisc.co.uk/MQA/intos...ngHighRez.html

All being well, I'll put up a tidied version of the demo program as well
in
case any computer programmers want to have a play with it.

Jim

--
Please use the address on the audiomisc page if you wish to email me.
Electronics
http://www.st-and.ac.uk/~www_pa/Scot...o/electron.htm
Armstrong Audio http://www.audiomisc.co.uk/Armstrong/armstrong.html
Audio Misc http://www.audiomisc.co.uk/index.html

Noise Shaping for high rez files and streams
 

Brian-Gaff wrote:

In the very start of digital some recordings looked fantastic on specs but
sounded crap, seeming like they had some kind of noise gate on them. then
came dither, which made recordings sound right again. I'll just leave this
hanging there....




** One of the first CDs I bought was of solo classical piano on the Erato label. At the end of each track, as the final note faded down it turned into a fizzing sound. This was noticeable at other quiet times too.

Reminded of crossover distortion in an amplifier.

So I returned the CD to the store because of the defect and was offered another copy by the sales person - who must have thought is was a bad pressing.

I knew better and asked for a credit instead.

I got a very funny reaction to doing that.


..... Phil

Noise Shaping for high rez files and streams
 

"Brian-Gaff" wrote in message
...
In the very start of digital some recordings looked fantastic on specs but
sounded crap, seeming like they had some kind of noise gate on them. then
came dither, which made recordings sound right again. I'll just leave this
hanging there....
Brian

Yes. Dither is required when converting from
32, 24 or 20 bits to16bits. It is done in the mastering
process, (not mixdown) and without it, mastering
software truncates all signals to which
wordlength reduction is applied.

My first experiences of digital recording
were back in the mid/late 1970's when
I heard some recordings made on the
Denon DN34. The machine's predecessor
had apparently been demonstrated as early
as 1972. I was very impressed!

Shortly after that, Decca,the record
company where I worked in the UK,
designed and built their own digital
recording/editing system for in-house use.

http://www.kolumbus.fi/iain.churches...alRecorder.jpg

Details from a Decca promo leaflet:

** The top rack housed an 18 bit D/A converter
for SPDIF, AES. The second rack housed a
20 bit A/D which converted the studio line level
signal to digital data stream in the Decca format.
SR 48kHz A signal processing unit (euro card frame)
that takes the digital data stream and converts it into a
signal that a modified video transport can record
(such as adding the various video sync pulses).
It also generates timecode and error correction data.
Working simultaneously in record and playback it also
displays off-tape record level via a peak hold PPM. It
reads the off-tape timecode and monitors the overall
quality of the recording (by counting lost samples).
It also has a limited amount of system
self-diagnostics.**

Iain

Noise Shaping for high rez files and streams
 

In article , Iain Churches
wrote:

http://www.kolumbus.fi/iain.churches...alRecorder.jpg

Details from a Decca promo leaflet:

** The top rack housed an 18 bit D/A converter for SPDIF, AES. The
second rack housed a 20 bit A/D which converted the studio line level
signal to digital data stream in the Decca format. SR 48kHz A signal
processing unit (euro card frame) that takes the digital data stream and
converts it into a signal that a modified video transport can record
(such as adding the various video sync pulses). It also generates
timecode and error correction data. Working simultaneously in record and
playback it also displays off-tape record level via a peak hold PPM. It
reads the off-tape timecode and monitors the overall quality of the
recording (by counting lost samples). It also has a limited amount of
system self-diagnostics.**

UKHHSoc would be interested in good scans of that leaflet. Would you be
willing to provide them or loan the leaflet?

BTW given the title of this thread people may find

http://jcgl.orpheusweb.co.uk/temp/shaped.png

of interest. It stems from a simple demo program I've written so that
people can experiment with DIY shaping 'high rez' files from 24 bit
down to 16bit in order to deal with the over-specifed 'noise' that
bloats FLACed versions

Jim

--
Please use the address on the audiomisc page if you wish to email me.
Electronics http://www.st-and.ac.uk/~www_pa/Scot...o/electron.htm
Armstrong Audio http://www.audiomisc.co.uk/Armstrong/armstrong.html
Audio Misc http://www.audiomisc.co.uk/index.html

Noise Shaping for high rez files and streams
 

"Phil Allison" wrote in message
...
Brian-Gaff wrote:

In the very start of digital some recordings looked fantastic on specs
but
sounded crap, seeming like they had some kind of noise gate on them. then
came dither, which made recordings sound right again. I'll just leave
this
hanging there....




** One of the first CDs I bought was of solo classical piano on the Erato
label. At the end of each track, as the final note faded down it turned
into a fizzing sound. This was noticeable at other quiet times too.

Reminded of crossover distortion in an amplifier.

So I returned the CD to the store because of the defect and was offered
another copy by the sales person - who must have thought is was a bad
pressing.

I knew better and asked for a credit instead.

I got a very funny reaction to doing that.

A bad pressing? I like that :-))
The sales person could have checked the bad pressing as
below. Pic taken 2010 by Keith G )

http://www.kolumbus.fi/iain.churches...rafidelity.jpg


Iain

Noise Shaping for high rez files and streams
 

In article ,
Phil Allison wrote:
Brian-Gaff wrote:

In the very start of digital some recordings looked fantastic on specs
but sounded crap, seeming like they had some kind of noise gate on
them. then came dither, which made recordings sound right again. I'll
just leave this hanging there....




** One of the first CDs I bought was of solo classical piano on the
Erato label. At the end of each track, as the final note faded down it
turned into a fizzing sound. This was noticeable at other quiet times
too.

It was also common practice on early CDs made from older analogue tapes to
have a steeper fade out at the end of a track than on the original vinyl
so you got silence between tracks. Never did see the point of that.

Reminded of crossover distortion in an amplifier.

So I returned the CD to the store because of the defect and was offered
another copy by the sales person - who must have thought is was a bad
pressing.

I knew better and asked for a credit instead.

I got a very funny reaction to doing that.


Of course there was plenty vinyl sold too with faults. That couldn't be
fixed by a new copy.

--
*It's o.k. to laugh during sexŒ.Œ.just don't point!

Dave Plowman London SW
To e-mail, change noise into sound.

Noise Shaping for high rez files and streams
 

On 17/02/2017 09:42, Iain Churches wrote:
A bad pressing? I like that :-))

I did have one once. It so happened we had a CD tester at work, and it
showed multiple errors scattered all over the surface. I contacted the
manufacturer, and they sent me a new disc. Pressed somewhere else... I
don't know if they did anything with the tester report I sent them.

Andy

Noise Shaping for high rez files and streams
 

In article , Vir
Campestris wrote:
On 17/02/2017 09:42, Iain Churches wrote:
A bad pressing? I like that :-))

I did have one once. It so happened we had a CD tester at work, and it
showed multiple errors scattered all over the surface. I contacted the
manufacturer, and they sent me a new disc. Pressed somewhere else... I
don't know if they did anything with the tester report I sent them.

I still have a CD which shows visible fingerprints in the information
layer. It does play OK.

Jim

--
Please use the address on the audiomisc page if you wish to email me.
Electronics http://www.st-and.ac.uk/~www_pa/Scot...o/electron.htm
Armstrong Audio http://www.audiomisc.co.uk/Armstrong/armstrong.html
Audio Misc http://www.audiomisc.co.uk/index.html

Noise Shaping for high rez files and streams
 

"Jim Lesurf" wrote in message
...
In article , Vir
Campestris wrote:
On 17/02/2017 09:42, Iain Churches wrote:
A bad pressing? I like that :-))

I did have one once. It so happened we had a CD tester at work, and it
showed multiple errors scattered all over the surface. I contacted the
manufacturer, and they sent me a new disc. Pressed somewhere else... I
don't know if they did anything with the tester report I sent them.

I still have a CD which shows visible fingerprints in the information
layer. It does play OK.

There was a subscriber on the valve/tube audio group RAT
who bought a Chinese KT88 that had a cigarette butt inside.

One wag asked "Was it still alight?"
Another replied "Alight? In a vacuum?"

:-))

Iain

Noise Shaping for high rez files and streams
 

"Dave Plowman (News)" wrote in message
...
In article ,
Phil Allison wrote:
Brian-Gaff wrote:

In the very start of digital some recordings looked fantastic on specs
but sounded crap, seeming like they had some kind of noise gate on
them. then came dither, which made recordings sound right again. I'll
just leave this hanging there....




** One of the first CDs I bought was of solo classical piano on the
Erato label. At the end of each track, as the final note faded down it
turned into a fizzing sound. This was noticeable at other quiet times
too.

It was also common practice on early CDs made from older analogue tapes to
have a steeper fade out at the end of a track than on the original vinyl
so you got silence between tracks. Never did see the point of that.

Tracks on analogue tapes are separated by a
three second leader (silence) so no fade of any kind
is required for either lacquer or CD mastering.

But, the 30dB lower noise floor on CD may have
given you that impression.


Iain

Noise Shaping for high rez files and streams
 

"Vir Campestris" wrote in message
o.uk...
On 17/02/2017 09:42, Iain Churches wrote:
A bad pressing? I like that :-))

I did have one once. It so happened we had a CD tester at work, and it
showed multiple errors scattered all over the surface. I contacted the
manufacturer, and they sent me a new disc. Pressed somewhere else... I
don't know if they did anything with the tester report I sent them.

:-))

Did the multiple errors affect the replay, or prevent
the disc from playing? Quite often they do not.

CD plants produce in "lines", so the replacement disc does
not have to be made somewhere else just on a different line.

A Reed Solomon reader (probably like the one you had at
work) is used for QC. One of these two gentlemen
(Reed or Solomon) is quoted as saying "without error
correcting codes digital audio would not be technically
feasible"

Iain

Noise Shaping for high rez files and streams
 

On 18/02/2017 12:00, Iain Churches wrote:
"Vir Campestris" wrote in message
o.uk...
On 17/02/2017 09:42, Iain Churches wrote:
A bad pressing? I like that :-))

I did have one once. It so happened we had a CD tester at work, and it
showed multiple errors scattered all over the surface. I contacted the
manufacturer, and they sent me a new disc. Pressed somewhere else... I
don't know if they did anything with the tester report I sent them.

:-))

Did the multiple errors affect the replay, or prevent
the disc from playing? Quite often they do not.

CD plants produce in "lines", so the replacement disc does
not have to be made somewhere else just on a different line.

A Reed Solomon reader (probably like the one you had at
work) is used for QC. One of these two gentlemen
(Reed or Solomon) is quoted as saying "without error
correcting codes digital audio would not be technically
feasible"

Which is complete bollox.

Anyway, a CD will play perfectly even after drilling a few 2mm holes in it.

--
Eiron.

Noise Shaping for high rez files and streams
 

On Sat, 18 Feb 2017 14:21:48 +0000, Eiron
wrote:

On 18/02/2017 12:00, Iain Churches wrote:
"Vir Campestris" wrote in message
o.uk...
On 17/02/2017 09:42, Iain Churches wrote:
A bad pressing? I like that :-))

I did have one once. It so happened we had a CD tester at work, and it
showed multiple errors scattered all over the surface. I contacted the
manufacturer, and they sent me a new disc. Pressed somewhere else... I
don't know if they did anything with the tester report I sent them.

:-))

Did the multiple errors affect the replay, or prevent
the disc from playing? Quite often they do not.

CD plants produce in "lines", so the replacement disc does
not have to be made somewhere else just on a different line.

A Reed Solomon reader (probably like the one you had at
work) is used for QC. One of these two gentlemen
(Reed or Solomon) is quoted as saying "without error
correcting codes digital audio would not be technically
feasible"

Which is complete bollox.

Anyway, a CD will play perfectly even after drilling a few 2mm holes in it.

Yup, and the reason it will is the error correction, specifically
trellis coding that splits a byte up into individual bits then dots
them all over the place so something like a hole won't destroy
complete bytes which would be hard to rebuild. The R&S coding plus a
heap of redundancy means you can reassemble valid data from some
pretty awful damage. They are right that not many CDs would survive
more than a few plays and still be readable without this error
correction.

d

---
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus

Noise Shaping for high rez files and streams
 

In article , Don Pearce
wrote:
Which is complete bollox.

Anyway, a CD will play perfectly even after drilling a few 2mm holes in
it.

Yup, and the reason it will is the error correction, specifically
trellis coding that splits a byte up into individual bits then dots them
all over the place so something like a hole won't destroy complete bytes
which would be hard to rebuild. The R&S coding plus a heap of redundancy
means you can reassemble valid data from some pretty awful damage.

Yes. Something I've been confirming over the last few days. c.f 'aside'
below...

They are right that not many CDs would survive more than a few plays and
still be readable without this error correction.

Not sure what you meant there. A conventionally made CD (i.e. not a CD-R/W)
shouldn't be degraded by being played a few times.

Aside:

A couple of days ago a musician we know brought a CDR they'd got from a
recent concert they'd made being recorded. This was covered with gunk which
took some cleaning off before it would play reliable even in some Audio CDR
players I use. It then played despite having an obvious 'hole' in the
polycarb covering one part of the disc. Fortunately the hole is smaller
than a mm or so.

But the disc was clearly still 'difficult' as one of the Audio CDR machines
players still a fuss about reading the TOC and deciding what it was. (The
other was happy.) Similarly, an experimental try and ripping it see what
I'd get using a standard drive in my main Linux box struggled.

However the drive in my RISC OS box read it, no worries. I used two
different ripping processes and the results, when compared, were
bit-identical. So I have now edited one work to have a track per movement.

I suspect the disc was written at far too high a rate as well as then
having been covered in gunk.

FWIW I also noticed that the recording has peaks that go right up to within
a gnat's crotchet of clipping. So I'll try and find out more about who
recorded it and if there is a source version to compare with. Curious to
see what I can find out.

However all the Audio CDRs I'd written a decade or so ago continue to be
playable with no problems - although I have now transferred almost all to
flac files anyay.

Jim

--
Please use the address on the audiomisc page if you wish to email me.
Electronics http://www.st-and.ac.uk/~www_pa/Scot...o/electron.htm
Armstrong Audio http://www.audiomisc.co.uk/Armstrong/armstrong.html
Audio Misc http://www.audiomisc.co.uk/index.html

Noise Shaping for high rez files and streams
 

On Sat, 18 Feb 2017 16:58:17 +0000 (GMT), Jim Lesurf
wrote:

They are right that not many CDs would survive more than a few plays and
still be readable without this error correction.

Not sure what you meant there. A conventionally made CD (i.e. not a CD-R/W)
shouldn't be degraded by being played a few times.

I was really referring to the random little marks and scratches that a
CD accumulates in less-than-careful hands. Without error correction
even minor marks make a CD unplayable.

d

---
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus

Noise Shaping for high rez files and streams
 

"Eiron" wrote in message
...
On 18/02/2017 12:00, Iain Churches wrote:
"Vir Campestris" wrote in message
o.uk...
On 17/02/2017 09:42, Iain Churches wrote:
A bad pressing? I like that :-))

I did have one once. It so happened we had a CD tester at work, and it
showed multiple errors scattered all over the surface. I contacted the
manufacturer, and they sent me a new disc. Pressed somewhere else... I
don't know if they did anything with the tester report I sent them.

:-))

Did the multiple errors affect the replay, or prevent
the disc from playing? Quite often they do not.

CD plants produce in "lines", so the replacement disc does
not have to be made somewhere else just on a different line.

A Reed Solomon reader (probably like the one you had at
work) is used for QC. One of these two gentlemen
(Reed or Solomon) is quoted as saying "without error
correcting codes digital audio would not be technically
feasible"

Which is complete bollox.

Anyway, a CD will play perfectly even after drilling a few 2mm holes in
it.

Indeed it will.
It is the error correction which makes that possible.

Do you remember Keith G who was one of the more
"interesting" subscribers to this group some years back?
When the drilling of small holes in CDs, and the fact that
they still played, was mentioned. He wrote: "That' nothing!
Every LP I own has a much bigger hole, and right through the
centre. The only error correction they have is an occasional
wipe with a DustBug. and they all play perfectly"

:-)

Iain

Noise Shaping for high rez files and streams
 

On 18/02/2017 12:00, Iain Churches wrote:
Did the multiple errors affect the replay, or prevent
the disc from playing? Quite often they do not.

I only put it in the tester because I had so much trouble playing it.

CD plants produce in "lines", so the replacement disc does
not have to be made somewhere else just on a different line.

The format of the ID number in the centre was different. I suspect a
different plant.

A Reed Solomon reader (probably like the one you had at
work) is used for QC. One of these two gentlemen
(Reed or Solomon) is quoted as saying "without error
correcting codes digital audio would not be technically
feasible"

It would give back analogue level data - pit/land lengths and
reflectivity, that sort of stuff - as well as the number of corrected
and uncorrectable errors. It was also stupidly expensive. My memory has
failed me though, and I can't recall the name!

Andy

Noise Shaping for high rez files and streams
 

In article , Iain Churches
scribeth thus

"Eiron" wrote in message
...
On 18/02/2017 12:00, Iain Churches wrote:
"Vir Campestris" wrote in message
o.uk...
On 17/02/2017 09:42, Iain Churches wrote:
A bad pressing? I like that :-))

I did have one once. It so happened we had a CD tester at work, and it
showed multiple errors scattered all over the surface. I contacted the
manufacturer, and they sent me a new disc. Pressed somewhere else... I
don't know if they did anything with the tester report I sent them.

:-))

Did the multiple errors affect the replay, or prevent
the disc from playing? Quite often they do not.

CD plants produce in "lines", so the replacement disc does
not have to be made somewhere else just on a different line.

A Reed Solomon reader (probably like the one you had at
work) is used for QC. One of these two gentlemen
(Reed or Solomon) is quoted as saying "without error
correcting codes digital audio would not be technically
feasible"

Which is complete bollox.

Anyway, a CD will play perfectly even after drilling a few 2mm holes in
it.

Indeed it will.
It is the error correction which makes that possible.

Do you remember Keith G who was one of the more
"interesting" subscribers to this group some years back?
When the drilling of small holes in CDs, and the fact that
they still played, was mentioned. He wrote: "That' nothing!
Every LP I own has a much bigger hole, and right through the
centre. The only error correction they have is an occasional
wipe with a DustBug. and they all play perfectly"

:-)

Iain



Yes met him at home once bought a brace of QUAD II's off him. Was a real
character Keith he had a sort of bedroom with most of the gear in, all
units piled on top of each other not an audio purist by any means but
very much an enthusiast, and that in abundance!.


Been dead now some time, lovely bloke and his wife Swimm was she
called?..
--
Tony Sayer

Noise Shaping for high rez files and streams
 

"tony sayer" wrote in message
...
In article , Iain Churches

Do you remember Keith G who was one of the more
"interesting" subscribers to this group some years back?
When the drilling of small holes in CDs, and the fact that
they still played, was mentioned. He wrote: "That' nothing!
Every LP I own has a much bigger hole, and right through the
centre. The only error correction they have is an occasional
wipe with a DustBug. and they all play perfectly"

:-)
Yes met him at home once bought a brace of QUAD II's off him. Was a real
character Keith he had a sort of bedroom with most of the gear in, all
units piled on top of each other not an audio purist by any means but
very much an enthusiast, and that in abundance!.

Yes a hi-fi enthusiast in the real sense. We never met,
but corresponded regularly. I got the impression
he was a very practical chap, good at carpentry,
and handy with the soldering iron. Quite rare
attributes for an audiophile in these plug-and-play
days.

He was interested in SET and FR speakers.
Such a system would have certainly
done justice to the kind of music he liked.

Unbeknown to Keith, I fixed him up with an invite to
a Lowther get-together. He told me: "Can ya believe it?
An invite right out of the blue, just arrived in the post"
He probably had an inkling, but I never let on:-).
He tucked some of his beloved recordings
under his arm, and went along, met some interesting
people, heard some fine music on some amazing
systems and by all account had a very good day.

Been dead now some time,
Five years.

lovely bloke and his wife Swimm was she
called?..

An acronym:-)
She is a very gifted pianist and clarinet player.

When I told Keith I was thinking about taking up the
saxophone, with a view to joining a band, he sent me
an .mp3 (from vinyl of course) of "Frankie and Johnny"
by the Count Basie Orchestra. He said, "It would
be great if you could play this" The band's second
CD "Mosaics" on which Frankie and Johnny (an accurate
transcription of the Basie original) is the opening title,
will be released this summer.

Keith would have been tickled pink :-)

Iain

Noise Shaping for high rez files and streams
 

On Wed, 22 Feb 2017 10:05:14 +0200, "Iain Churches"
wrote:


"tony sayer" wrote in message

Been dead now some time,
Five years.

lovely bloke and his wife Swimm was she
called?..

An acronym:-)

SWMBO

She who must be obeyed

from Rider Haggard via John Mortimer.

Noise Shaping for high rez files and streams
 

On 22/02/2017 09:13, Bill Taylor wrote:
On Wed, 22 Feb 2017 10:05:14 +0200, "Iain Churches"
wrote:


"tony sayer" wrote in message

Been dead now some time,
Five years.

lovely bloke and his wife Swimm was she
called?..

An acronym:-)

SWMBO

She who must be obeyed

from Rider Haggard via John Mortimer.


Sounds better than 'er indoors.

--
Graeme Wall
This account not read.

Noise Shaping for high rez files and streams
 

On 22/02/2017 08:05, Iain Churches wrote:
"tony sayer" wrote in message
...
In article , Iain Churches

Do you remember Keith G who was one of the more
"interesting" subscribers to this group some years back?
When the drilling of small holes in CDs, and the fact that
they still played, was mentioned. He wrote: "That' nothing!
Every LP I own has a much bigger hole, and right through the
centre. The only error correction they have is an occasional
wipe with a DustBug. and they all play perfectly"

:-)
Yes met him at home once bought a brace of QUAD II's off him. Was a real
character Keith he had a sort of bedroom with most of the gear in, all
units piled on top of each other not an audio purist by any means but
very much an enthusiast, and that in abundance!.

Yes a hi-fi enthusiast in the real sense. We never met,
but corresponded regularly. I got the impression
he was a very practical chap, good at carpentry,
and handy with the soldering iron. Quite rare
attributes for an audiophile in these plug-and-play
days.


Nil nisi bonum and all that, but there are limits.

--
Eiron.

Noise Shaping for high rez files and streams
 

"Bill Taylor" wrote in message
...
On Wed, 22 Feb 2017 10:05:14 +0200, "Iain Churches"
wrote:


"tony sayer" wrote in message

Been dead now some time,
Five years.

lovely bloke and his wife Swimm was she
called?..

An acronym:-)

SWMBO

She who must be obeyed

from Rider Haggard via John Mortimer.

In this case it was definately
SWIMM

Noise Shaping for high rez files and streams
 

On 22/02/2017 11:23, Iain Churches wrote:
"Bill Taylor" wrote in message
...
On Wed, 22 Feb 2017 10:05:14 +0200, "Iain Churches"
wrote:


"tony sayer" wrote in message

Been dead now some time,
Five years.

lovely bloke and his wife Swimm was she
called?..

An acronym:-)

SWMBO

She who must be obeyed

from Rider Haggard via John Mortimer.

In this case it was definately
SWIMM





She Who I Must Marry?

--
Graeme Wall
This account not read.

Noise Shaping for high rez files and streams
 

Iain Churches wrote:

Bill Taylor wrote:

SWMBO
She who must be obeyed
from Rider Haggard via John Mortimer.

In this case it was definately
SWIMM

She who I mistakenly married?

Noise Shaping for high rez files and streams
 

On Wed, 22 Feb 2017 13:23:28 +0200, "Iain Churches"
wrote:


"Bill Taylor" wrote in message
.. .
On Wed, 22 Feb 2017 10:05:14 +0200, "Iain Churches"
wrote:


"tony sayer" wrote in message

Been dead now some time,
Five years.

lovely bloke and his wife Swimm was she
called?..

An acronym:-)

SWMBO

She who must be obeyed

from Rider Haggard via John Mortimer.

In this case it was definately
SWIMM




He used Swimm and SWMBO interchangeably - I think swimm was just the
one he could pronounce easily.

d

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Noise Shaping for high rez files and streams
 

In article ,
Eiron wrote:
On 22/02/2017 08:05, Iain Churches wrote:
"tony sayer" wrote in message
...
In article , Iain Churches

Do you remember Keith G who was one of the more
"interesting" subscribers to this group some years back?
When the drilling of small holes in CDs, and the fact that
they still played, was mentioned. He wrote: "That' nothing!
Every LP I own has a much bigger hole, and right through the
centre. The only error correction they have is an occasional
wipe with a DustBug. and they all play perfectly"

:-)
Yes met him at home once bought a brace of QUAD II's off him. Was a real
character Keith he had a sort of bedroom with most of the gear in, all
units piled on top of each other not an audio purist by any means but
very much an enthusiast, and that in abundance!.

Yes a hi-fi enthusiast in the real sense. We never met,
but corresponded regularly. I got the impression
he was a very practical chap, good at carpentry,
and handy with the soldering iron. Quite rare
attributes for an audiophile in these plug-and-play
days.


Nil nisi bonum and all that, but there are limits.

Quite. I remember him best for going on an on about how much better vinyl
was than CD.

And how his 'firewood' single driver speakers beat all. With each new
variation being miles better than the previous one.

But as a character, much missed.

--
*Why is it that doctors call what they do "practice"?

Dave Plowman London SW
To e-mail, change noise into sound.

Noise Shaping for high rez files and streams
 

In article ,
Eiron wrote:
On 22/02/2017 08:05, Iain Churches wrote:
"tony sayer" wrote in message
...
In article , Iain Churches

Do you remember Keith G who was one of the more
"interesting" subscribers to this group some years back?
When the drilling of small holes in CDs, and the fact that
they still played, was mentioned. He wrote: "That' nothing!
Every LP I own has a much bigger hole, and right through the
centre. The only error correction they have is an occasional
wipe with a DustBug. and they all play perfectly"

:-)
Yes met him at home once bought a brace of QUAD II's off him. Was a
real
character Keith he had a sort of bedroom with most of the gear in, all
units piled on top of each other not an audio purist by any means but
very much an enthusiast, and that in abundance!.

Yes a hi-fi enthusiast in the real sense. We never met,
but corresponded regularly. I got the impression
he was a very practical chap, good at carpentry,
and handy with the soldering iron. Quite rare
attributes for an audiophile in these plug-and-play
days.


Nil nisi bonum and all that, but there are limits.

I wonder, is there anyone these days who builds their
own equipment?. Back in the day, I knew dozens of
people who built turntable plinths, speaker cabinets,
valve amps, preamps, and transistor preamps in tobacco
tins.


Halycon days :-)

Iain

Noise Shaping for high rez files and streams
 

On Wed, 22 Feb 2017 19:57:52 +0200, "Iain Churches"
wrote:


In article ,
Eiron wrote:
On 22/02/2017 08:05, Iain Churches wrote:
"tony sayer" wrote in message
...
In article , Iain Churches

Do you remember Keith G who was one of the more
"interesting" subscribers to this group some years back?
When the drilling of small holes in CDs, and the fact that
they still played, was mentioned. He wrote: "That' nothing!
Every LP I own has a much bigger hole, and right through the
centre. The only error correction they have is an occasional
wipe with a DustBug. and they all play perfectly"

:-)
Yes met him at home once bought a brace of QUAD II's off him. Was a
real
character Keith he had a sort of bedroom with most of the gear in, all
units piled on top of each other not an audio purist by any means but
very much an enthusiast, and that in abundance!.

Yes a hi-fi enthusiast in the real sense. We never met,
but corresponded regularly. I got the impression
he was a very practical chap, good at carpentry,
and handy with the soldering iron. Quite rare
attributes for an audiophile in these plug-and-play
days.


Nil nisi bonum and all that, but there are limits.

I wonder, is there anyone these days who builds their
own equipment?. Back in the day, I knew dozens of
people who built turntable plinths, speaker cabinets,
valve amps, preamps, and transistor preamps in tobacco
tins.


Halycon days :-)


I'm holding my hand up. I learned Solidworks, and got a laser cutter
and 3D printer. And I have access any time I want to a CNC mill and a
lathe. So yes, plenty of things - mostly controlled using an Arduino
micro. Most of the electronics is for interfaces, but two months ago I
built a mic preamp specially for a high impedance mic I have.
Commercial pre-amps are all aimed at low impedance mics, and totally
unsuited to this one. Not in a tobacco tin - much better, an Altoids
tin.

d

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In article ,
Don Pearce wrote:
I'm holding my hand up. I learned Solidworks, and got a laser cutter
and 3D printer. And I have access any time I want to a CNC mill and a
lathe. So yes, plenty of things - mostly controlled using an Arduino
micro. Most of the electronics is for interfaces, but two months ago I
built a mic preamp specially for a high impedance mic I have.
Commercial pre-amps are all aimed at low impedance mics, and totally
unsuited to this one. Not in a tobacco tin - much better, an Altoids
tin.

Just waiting for some PCBs for some of the electronics on the old car to
arrive. I made a prototype to improve on the '70s Lucas design, and
several have expressed interest, so I'd had a batch made for the first
time. Previously, I've made my own from scratch.
Only need 20 for the initial run, but even for that modest quantity, it's
cheaper to have them made than DIY.

--
*Do infants enjoy infancy as much as adults enjoy adultery? *

Dave Plowman London SW
To e-mail, change noise into sound.

Noise Shaping for high rez files and streams
 

On Thu, 23 Feb 2017 01:08:51 +0000 (GMT), "Dave Plowman (News)"
wrote:

In article ,
Don Pearce wrote:
I'm holding my hand up. I learned Solidworks, and got a laser cutter
and 3D printer. And I have access any time I want to a CNC mill and a
lathe. So yes, plenty of things - mostly controlled using an Arduino
micro. Most of the electronics is for interfaces, but two months ago I
built a mic preamp specially for a high impedance mic I have.
Commercial pre-amps are all aimed at low impedance mics, and totally
unsuited to this one. Not in a tobacco tin - much better, an Altoids
tin.

Just waiting for some PCBs for some of the electronics on the old car to
arrive. I made a prototype to improve on the '70s Lucas design, and
several have expressed interest, so I'd had a batch made for the first
time. Previously, I've made my own from scratch.
Only need 20 for the initial run, but even for that modest quantity, it's
cheaper to have them made than DIY.

Who do you use? My favourites are these people

http://dirtypcbs.com/store/pcbs

Really quick and cheap service as long as you follow the rules.

d

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"Dave Plowman (News)" wrote in message
...
In article ,
Don Pearce wrote:
I'm holding my hand up. I learned Solidworks, and got a laser cutter
and 3D printer. And I have access any time I want to a CNC mill and a
lathe. So yes, plenty of things - mostly controlled using an Arduino
micro. Most of the electronics is for interfaces, but two months ago I
built a mic preamp specially for a high impedance mic I have.
Commercial pre-amps are all aimed at low impedance mics, and totally
unsuited to this one. Not in a tobacco tin - much better, an Altoids
tin.

Just waiting for some PCBs for some of the electronics on the old car to
arrive.

Motoring, like hi-fi used to be very much a hands-on affair.
Not much to be done these days. Modern cars have most
of the engine enclosed, and a large D connector socket:-)

When I was a nipper, my brother had an MGA.
On Sunday morning, he and Dad used to "balance the carbs"
with a pair of rubber tubes, one in each ear. Then a spot
of oil in each dashpot, and off they went.

Iain

Noise Shaping for high rez files and streams
 

On 23/02/2017 08:55, Iain Churches wrote:

Motoring, like hi-fi used to be very much a hands-on affair.
Not much to be done these days. Modern cars have most
of the engine enclosed, and a large D connector socket:-)

When I was a nipper, my brother had an MGA.
On Sunday morning, he and Dad used to "balance the carbs"
with a pair of rubber tubes, one in each ear. Then a spot
of oil in each dashpot, and off they went.

How fortunate he didn't have an XKE, as then he would have had to buy
the correct tool for the job.

Eiron.

Noise Shaping for high rez files and streams
 

"Eiron" wrote in message
...
On 23/02/2017 08:55, Iain Churches wrote:

Motoring, like hi-fi used to be very much a hands-on affair.
Not much to be done these days. Modern cars have most
of the engine enclosed, and a large D connector socket:-)

When I was a nipper, my brother had an MGA.
On Sunday morning, he and Dad used to "balance the carbs"
with a pair of rubber tubes, one in each ear. Then a spot
of oil in each dashpot, and off they went.

How fortunate he didn't have an XKE, as then he would have had to buy the
correct tool for the job.

For MGs at least, rubber tubing was the common if not
correct tool:-)

Dad was a great MG enthusiast. He had owned a TC and TF
before the slighlty more sedate Magnette and so the MGA
seemed an appropriate choice for my brother.

I guess balancing the carbs puts the thread "Noise Shaping"
back on track :-)

Iain

Noise Shaping for high rez files and streams
 

In article ,
Eiron wrote:
When I was a nipper, my brother had an MGA.
On Sunday morning, he and Dad used to "balance the carbs"
with a pair of rubber tubes, one in each ear. Then a spot
of oil in each dashpot, and off they went.

How fortunate he didn't have an XKE, as then he would have had to buy
the correct tool for the job.

If you've got a decent ear, you can balance carbs like that just as
accurately as by using a flow meter. But using one tube to one ear, and
moving it carb to carb.

However, SU carbs don't need tweaking every Sunday. If they do, they are
faulty.

--
*'Progress' and 'Change' are not synonyms.

Dave Plowman London SW
To e-mail, change noise into sound.

Noise Shaping for high rez files and streams
 

In article ,
Don Pearce wrote:
Just waiting for some PCBs for some of the electronics on the old car to
arrive. I made a prototype to improve on the '70s Lucas design, and
several have expressed interest, so I'd had a batch made for the first
time. Previously, I've made my own from scratch.
Only need 20 for the initial run, but even for that modest quantity, it's
cheaper to have them made than DIY.

Who do you use? My favourites are these people

http://dirtypcbs.com/store/pcbs

Really quick and cheap service as long as you follow the rules.

I went for PCB Train (Newbury Electronics) on a recommendation after being
told they were very helpful to a newbie. And so they were. I'm not using a
pukka PCB prog to produce the gerber files, so needed a little guidance.
Now I've got just what those are a bit clearer in my mind, I could
probably use a cheaper alternative. I went for the cheaper 4 week
turnround as there's no rush for them. So they should arrive next week.

--
*Why were the Indians here first? They had reservations.*

Dave Plowman London SW
To e-mail, change noise into sound.

Noise Shaping for high rez files and streams
 

"Dave Plowman (News)" wrote in message
...
In article ,
Eiron wrote:
When I was a nipper, my brother had an MGA.
On Sunday morning, he and Dad used to "balance the carbs"
with a pair of rubber tubes, one in each ear. Then a spot
of oil in each dashpot, and off they went.

How fortunate he didn't have an XKE, as then he would have had to buy
the correct tool for the job.

If you've got a decent ear, you can balance carbs like that just as
accurately as by using a flow meter. But using one tube to one ear, and
moving it carb to carb.

However, SU carbs don't need tweaking every Sunday. If they do, they are
faulty.

Necessary or not, that was their routine,
before they went out together on a Sunday morning.

Iain

Noise Shaping for high rez files and streams
 

On Thu, 23 Feb 2017 11:20:13 +0000 (GMT), "Dave Plowman (News)"
wrote:

In article ,
Don Pearce wrote:
Just waiting for some PCBs for some of the electronics on the old car to
arrive. I made a prototype to improve on the '70s Lucas design, and
several have expressed interest, so I'd had a batch made for the first
time. Previously, I've made my own from scratch.
Only need 20 for the initial run, but even for that modest quantity, it's
cheaper to have them made than DIY.

Who do you use? My favourites are these people

http://dirtypcbs.com/store/pcbs

Really quick and cheap service as long as you follow the rules.

I went for PCB Train (Newbury Electronics) on a recommendation after being
told they were very helpful to a newbie. And so they were. I'm not using a
pukka PCB prog to produce the gerber files, so needed a little guidance.
Now I've got just what those are a bit clearer in my mind, I could
probably use a cheaper alternative. I went for the cheaper 4 week
turnround as there's no rush for them. So they should arrive next week.

I use all free software for this. LTSpice creates the schematic and
simulates it, and it creates a netlist. Then Freepcb reads the netlist
and lets you create the artwork really easily. It generates the
Gerbers in exactly the format that dirtypcbs want. But you are
probably right to use PCBtrain - dirtypcb offer no help.

d

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Noise Shaping for high rez files and streams
 

In article ,
Don Pearce wrote:
I went for PCB Train (Newbury Electronics) on a recommendation after being
told they were very helpful to a newbie. And so they were. I'm not using a
pukka PCB prog to produce the gerber files, so needed a little guidance.
Now I've got just what those are a bit clearer in my mind, I could
probably use a cheaper alternative. I went for the cheaper 4 week
turnround as there's no rush for them. So they should arrive next week.

I use all free software for this. LTSpice creates the schematic and
simulates it, and it creates a netlist. Then Freepcb reads the netlist
and lets you create the artwork really easily. It generates the
Gerbers in exactly the format that dirtypcbs want. But you are
probably right to use PCBtrain - dirtypcb offer no help.

Basically I've got lots and lots of drawings of PCBs on file. All done for
the standard photo process you can use at home. Not involved multi-layer
surface mount stuff. So needed to know what was required for gerber, so I
could convert them. (My CAD prog will load them, and produce gerber from
them. But you do need to make sure things in the original files translate
OK, and modify if needed) It's been quite fun learning.

It's only a hobby, and I enjoy doing (fairly simple) layouts etc by hand.
Obviously if doing the sort of things you do, I'd have to learn up the
standard software for that.

--
*A journey of a thousand sites begins with a single click *

Dave Plowman London SW
To e-mail, change noise into sound.