RE: Nicam modulation (or not) (OT)

["Nick Broughton" <mail@xxxxxxx>]

Thanks Phil

It seems that it was my understanding at fault.  Everything you say
follows
>from
audio carrier.

Nick
> -----Original Message-----
> From: Phillip Harris [mailto:phil@xxxxxxx]
> Sent: 05 May 2002 23:11
> To: ukha_d@xxxxxxx
> Subject: RE: [ukha_d] Nicam modulation (or not) (OT)
>
>
>
> > In my experience if you record a Nicam broadcast on a mono
> > VCR (OK I know we are talking about stone age equipment, but
> > it's the technical aspect that bothers me), and then replay
> > it to a Nicam TV, why don't you get stereo?
>
> Because the NICAM carrier and signal is not recorded with the video
and
> mono audio.#
>
> > I believe that Nicam is modulated onto the 'normal' audio
> > carrier.  Nicam modulation is expensive so VCR's don't do
it,
> > but if the Nicam was never demodulated, why isn't it the
> > original modulated signal recorded and passed to the TV?
>
> Nope ... It's sent modulated onto a carrier offset by a frequency
which
> I cannot remember from the base UHF frequency of the channel.
>
> > As I'm writing something else ocurrs to me.  Even a Nicam
VCR
> > could record audio before decoding it, but again in my
> > experience they only playback mono if connected via RF, you
> > need to connect via something 'better' to get stereo.
>
> NICAM VCRs do decode the NICAM audio and record it as a HiFi
Stereo
> (separate to the linear mono) track ... They pass that signal out
as
> stereo audio on phonos or SCART sockets - they do not remodulate
as
> NICAM as there are no decent cheap domestic NICAM encoders
availsble.
>
> > What's wrong?  My experience or my logic?
>
> Your expectations?
>
> Phil
>
>
>
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