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More audio tomfoolery
In article ,
UnsteadyKen wrote: In article: Johnny B Good says... Unfortunately, I don't seem to have the article(s) in question Possibly not what you were thinking of, but an interesting article about digital headroom. http://benchmarkmedia.com/blogs/news...dio-goes-to-11 FWIW I use a Benchmark ADC. :-) I did try one of their DAC/preamps and liked it a lot. However I found that it was designed for a system that used AV 'triggering', etc so really aimed at an AV setup based on an AV 'receiver' approach. It worked well, but simply didn't suit the way I use my systems. 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 |
More audio tomfoolery
In article , John R Leddy
wrote: Now I've opened this can of worms, here's a real-world issue which will probably never occur again. I have a John Mayall "Blues Breakers With Eric Clapton" CD [EAN 0042284482721] http://tinyurl.com/plcu65u This CD contains both mono and stereo tracks which EAC has extracted to all being stereo. I have separated the tracks into two directories: John Mayall - 1966 - Blues Breakers With Eric Clapton (Mono), and John Mayall - 1969 - Blues Breakers With Eric Clapton (Stereo) I know you're aware I won't be held back by the minutiae, so whether all the tracks ultimately end up in one directory or two, those faux stereo tracks will be getting processed at some point. Before I drop them into Audacity [Tracks - Stereo Track to Mono], I would appreciate your best practice advice on what to do next. I'm not sure what you're asking me TBH. I'd probably use sox to make the tracks into flac files. And add the -c 1 option for the mono examples to get mono flac files. (Use stats at the end of the command to keep an eye on possible clipping, but it shouldn't happen.) FWIW someone in the past found they got clipping with using Audacity to do a stereo - mono conversion as it added the values before dividing them by 2 to average. But I think they were using fixed point mode. Didn't check myself as I always use sox for such tasks. I just use audacity for things like click removal or LP captures. 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 |
Quote:
Hopefully EAC will have created left and right channels which are effectively the same due to being from a singular mono source. All a bit academic now. The conversion sounds okay to my ears, on my equipment, in my room. Job done and move on I guess. Quote:
http://sourceforge.net/blog/sourcefo...e-restoration/ http://sourceforge.net/ allowed me to search for "SoX" leading me to http://sourceforge.net/directory/os:...updated/?q=SoX and http://sourceforge.net/projects/sox/?source=directory, so thanks, I'll have a play with SoX the next time I need to process files and time allows investigation. |
Meanwhile on a DAB station near you... was: More audio tomfoolery
So here we are worrying about whether 16 bits is good enough (I think it
is, just) or whether we should sample at 96kHz or 88.2... and I put our DAB stereo on today. I thought it sounds a bit off, so I checked. 80kbit mono. Try another station. Same. I think I might have to get a net streamer appliance and chuck the radio away! Andy |
Meanwhile on a DAB station near you... was: More audio tomfoolery
In article , Vir
Campestris scribeth thus So here we are worrying about whether 16 bits is good enough (I think it is, just) or whether we should sample at 96kHz or 88.2... and I put our DAB stereo on today. I thought it sounds a bit off, so I checked. 80kbit mono. Try another station. Same. I think I might have to get a net streamer appliance and chuck the radio away! Andy Theres a trial Mux being started from Cambridge shortly, AFAIK there are some 192K streams on there!... -- Tony Sayer |
Meanwhile on a DAB station near you... was: More audio tomfoolery
On Sun, 19 Jul 2015 21:21:05 +0100, Vir Campestris
wrote: So here we are worrying about whether 16 bits is good enough (I think it is, just) or whether we should sample at 96kHz or 88.2... and I put our DAB stereo on today. I thought it sounds a bit off, so I checked. 80kbit mono. Try another station. Same. I think I might have to get a net streamer appliance and chuck the radio away! Andy Use the radio streams on Freeview. Not entirely brilliant, but a sight better than DAB. d |
More audio tomfoolery
In article , John R Leddy
wrote: Just whether it would be advisable to avoid using the Amplify effect in Audacity on my music files. Ok, Understood. I've only even used the amplify effect to essentially 'mute' a section by appying a gain of -80dB. Sometimes do this (alongside a fade in/out) for sections of LP/tape background noise when there is no music. Can save time that would otherwise be occupied removing clicks, etc. If I wanted general gain changes I'd tend to apply them using sox as I'm satisfied that works well. But for all In know the amplify in Audacity is fine. I've never assessed it. Check, though, what mode Audacity is storing/processing the data. Ensure it is something in the range from 24 bit int to full floating point. That will help minimise any degrading during reprocessing. And if you are going to enlarge the sample values to get a louder result, I'd recommend ensuring no sample in the result exceeds about -2dBFS. That ensures the result stays clear of clipping during any later processing. e.g. in a DAC. Samples above about -1dBFS may lead to clipping at a later stage. Again, sox, will give you such info if you use its 'stats' option. FWIW Personally, with 24 bit 96k I tend to leave 6dB or more of headroom. But this is because I've set a standard 'reference' gain for my ADC so that I don't have to alter it from one LP/tape to the next. Most LPs then max sample at about -6 to -8dBFS. But a few reach up to around -1dBFS on rare occasions. (Usually bad clicks, but on one or two occasions, real musical peaks.) Given a good 24bit ADC this seems fine. 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 |
Meanwhile on a DAB station near you... was: More audio tomfoolery
In article , Don Pearce
wrote: On Sun, 19 Jul 2015 21:21:05 +0100, Vir Campestris wrote: So here we are worrying about whether 16 bits is good enough (I think it is, just) or whether we should sample at 96kHz or 88.2... and I put our DAB stereo on today. I thought it sounds a bit off, so I checked. 80kbit mono. Try another station. Same. I think I might have to get a net streamer appliance and chuck the radio away! Andy Use the radio streams on Freeview. Not entirely brilliant, but a sight better than DAB. Alas, less useful as advice in Scotland. :-/ 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 |
Meanwhile on a DAB station near you... was: More audio tomfoolery
In article ,
Jim Lesurf wrote: Use the radio streams on Freeview. Not entirely brilliant, but a sight better than DAB. Alas, less useful as advice in Scotland. :-/ FTA satellite? I don't much use mine, but pretty well every radio station seems to be up there if you look. -- *Yes, I am an agent of Satan, but my duties are largely ceremonial Dave Plowman London SW To e-mail, change noise into sound. |
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