Re: R3 on freeview, low audio ?

In article <4331b601$0$73621$ed2619ec@xxxxxxxxxxxxxxxxxxxxxxxxxx>,
Martin Underwood <news@xxxxxxx> wrote:
> Certainly my Pioneer OnDigital box gives consistently lower level audio
> on all channels (TV and radio) than the corresponding NICAM TV sound or
> FM radio sound. The difference varies, but it's typically about 6dB
> lower, which is enough to require me to adjust my headphones each time
> I switch between the two, to avoid deafening myself or being unable to
> hear.

I'm surprised you find that with some radio channels on DTTV. Some appear
to peak to 0dBFS. Including R1 - although not R3&4.

> I've recorded the same sound from NICAM and DTT onto my PC and I can see
> a very clear difference in peak level. Normalising the two samples so
> their peak level is roughly the same gives reasonably indistinguishable
> sound. Unfortunately it's not a true like-for-like comparison because I
> have to record one sound source to HiFi VHS (for later grabbing as a
> WAV file) while grabbing the other live, because there's only a second
> or so delay between the two.

> I wish there was a pot inside the OnD box that I could tweak to increase
> the level to one that sounded comparable with the NICAM or FM radio
> equivalent.

Yes. I've added an amp to my Sony DTTV box to make it match analogue or
NICAM off air through my set. But strangely, none of the (3) other DTTV
boxes I've got are low level.

It seems to be down to how the line up is implemented. Pro digital levels
allow approx 10dB of headroom *above* peak. Analogue or NICAM - who knows,
but nothing like that. Of course, outside the pro field, peak lights will
be flashing on any system. 'Twas ever thus.


There was a channel on DTTV transmitting tone and bars earlier tonight, so
I got a chance to look at the level in the workshop on a decent test set.
And the level I'd set from the Sony plus amp by expecting TV progs to peak
to maximum and ads to 4 dB less proved to be within 0.5 dB.

--
*OK, who stopped payment on my reality check?

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

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