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'[PICLIST] TV's highest frequency'
2000\12\09@172650 by Pedro Drummond

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Do any of you know how high a pitch can an FM station or TV station
broadcast ? Maybe 8 or 10 kHz ?

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2000\12\09@182827 by Matt Bennett

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Pedro Drummond wrote:
>
> Do any of you know how high a pitch can an FM station or TV station
> broadcast ? Maybe 8 or 10 kHz ?
>
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FM stereo stations are normally band limited to about 15 KHz, to give
the 19 KHz stereo pilot tone a guard band.  In mono, it is theoretically
possible to go way beyond human hearing, though it is usually never
done.

The aural band on TV is not as good- about 12KHz or so.  These numbers
apply to North American stations, they probably vary from country to
country, but I'd guess that they don't vary too far.

Matt

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2000\12\09@183237 by David VanHorn

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At 08:26 PM 12/9/00 -0200, Pedro Drummond wrote:
>Do any of you know how high a pitch can an FM station or TV station
>broadcast ? Maybe 8 or 10 kHz ?

They do stereo audio, that involves a subcarrier somewhere 20-30 kHz or so,
I'd be suprised if the decoded audio channels went much beyond 10-15 kHz.

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2000\12\09@193839 by hgraf

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> Do any of you know how high a pitch can an FM station or TV station
> broadcast ? Maybe 8 or 10 kHz ?

    AFAIK the highest theoretical is 15kHz although I doubt there is much
response at that frequency. TTYL

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2000\12\10@061932 by Nigel Goodwin

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In message <000901c0622f$286d2380$04646464@diretor>, Pedro Drummond
<spam_OUTprd2TakeThisOuTspamINTERNETCOM.COM.BR> writes
>Do any of you know how high a pitch can an FM station or TV station
>broadcast ? Maybe 8 or 10 kHz ?

Going from memory, I seem to recall that FM radio reaches as high as
16KHz, limited by the use of a 19KHz pilot tone used for the stereo
multiplexing at 38KHz. As for TV, it depends which type of TV system is
in use, the UK uses NICAM Digital Stereo, this gives very high quality
digital sound - advertised as 'CD quality', but certainly of higher
quality than FM radio. Normal inter-carrier mono TV sound is slightly
less than FM radio, but still very acceptable.
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2000\12\13@002845 by Harold Hallikainen

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       TV stations not running BTSC stereo may modulate the aural carrier with
up to 120 kHz. Stations running BTSC stereo must keep their audio clear
of the 15.734 kHz pilot subcarrier and the stereo subcarrier. Stations
are also allowed to run other subcarriers (such as the SAP or other
subcarriers up to the 120 kHz instantaneous frequency max).  See
http://www.hallikainen.com/cgi-bin/section.pl?section=73.682 .
       Monaural FM stations can run subcarriers up to 100 kHz. Typical
subcarriers are 57 kHz, 67 kHz and 92 kHz. FM stereo uses a 19 kHz pilot
subcarrier and a DSBSC AM subcarrier at 38 kHz (carrying the L-R audio).
For more info, see
http://www.hallikainen.com/cgi-bin/section.pl?section=73.319 FM
subcarriers
http://www.hallikainen.com/cgi-bin/section.pl?section=73.322 FM stereo

Harold

On Sat, 9 Dec 2000 18:31:00 -0500 David VanHorn <dvanhornspamKILLspamCEDAR.NET>
writes:
{Quote hidden}

FCC Rules Online at http://www.hallikainen.com/FccRules/

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