In article , Don Pearce
scribeth thus
On Fri, 6 Aug 2010 20:48:21 +0100, tony sayer
wrote:

In article , Peter Chant
scribeth thus
Jim Lesurf wrote:


Does it? Stereo FM is limited to about 15kHz. I thought DAB exceeded that.
It does use a 48k sampling rate so in principle could reach 24kHz,
although I assume the data-reduction will throw away some of the HF end
depending on settings and content.

Where did you get the info? I've not measured DAB in ages. I guess I
should check.

I've not read it for a while but I through FM was 17.5 - 18 kHz

Its cut off at 15 kHz in most all systems to protect the pilot tone at
19 kHz..


The low cutoff in FM is not so much to do with the pilot tone as the
fact that it is distributed to the transmitters using NICAM, which has
a 32kHz sampling rate.

d

Don do bear in mind that the BBC isn't the only broadcaster in the UK and not
all use NICAM feeds;!.

Also FM stations elsewhere in the world aren't NICAM fed.. Usually line or
microwave radio link.

Still a couple of K up at that end aren't going to set the world alight;}..
--
Tony Sayer