| Topic: |
Science > Physics |
| User: |
"Warrick FitzGerald" |
| Date: |
11 Apr 2005 10:02:31 AM |
| Object: |
Public Radio |
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Hi All,
I was just reading these two articles RE: Pulse Code Modulation
http://en.wikipedia.org/wiki/PSTN
http://en.wikipedia.org/wiki/Pulse_code_modulation
So I now know that phone audio is recorded \ transmitted at 8kHz.
Does anyone know how and at what quality normal radio audio is
transmitted at?
Thanks
Warrick
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<font size="-1"><font face="Arial">Hi All,<br>
<br>
I was just reading these two articles RE: Pulse Code Modulation<br>
<br>
<a class="moz-txt-link-freetext" href="http://en.wikipedia.org/wiki/PSTN">http://en.wikipedia.org/wiki/PSTN</a><br>
<a class="moz-txt-link-freetext" href="http://en.wikipedia.org/wiki/Pulse_code_modulation">http://en.wikipedia.org/wiki/Pulse_code_modulation</a><br>
<br>
So I now know that phone audio is recorded \ transmitted at 8kHz. <br>
<br>
Does anyone know how and at what quality normal radio audio is
transmitted at?<br>
<br>
Thanks<br>
Warrick<br>
<br>
<br>
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| User: "Jan Panteltje" |
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| Title: Re: Public Radio |
11 Apr 2005 02:12:38 PM |
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On a sunny day (Mon, 11 Apr 2005 11:02:31 -0400) it happened Warrick
FitzGerald <subs.nntp.wfitzgerald@crtman.com> wrote in
<ckw6e.15$Ua4.201@news.uswest.net>:
Hi All,
I was just reading these two articles RE: Pulse Code Modulation
http://en.wikipedia.org/wiki/PSTN
http://en.wikipedia.org/wiki/Pulse_code_modulation
So I now know that phone audio is recorded \ transmitted at 8kHz.
Does anyone know how and at what quality normal radio audio is
transmitted at?
Depends on what you mean by 'normal' radio.
These days there is satellite radio...
AM MW radio as Amplitude Modulated (that is what AM stands for).
And FM radio is Frequency Modulated (that is what FM stands for).
Neither is digital and has anything to do with sampling or PCM.
AM has some 5 kHz AUDIO bandwidth, FM (here) 15 kHz or so.
The signal to noise ratio for FM is a lot better then for AM.
Broadcast FM has a 19 kHz pilot for stereo.
Stereo FM has much worse signal to noise.
I am sure you know these things, you must have listened to a radio
sometimes.
These are little boxes, with knobs, and music or at least sound comes
out, if you twiddle the knobs in the right way.
Much like a piano, but less knobs and easier to play.
Sorry... LOL
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| User: "Paul Cardinale" |
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| Title: Re: Public Radio |
11 Apr 2005 05:48:16 PM |
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Jan Panteltje wrote:
[snip]
AM has some 5 kHz AUDIO bandwidth,
The spacing of the AM channels is at 10Khz intervals, so theoretically,
if stations are packed together, you can get up to 5Khz of bandwidth
(with brick-wall filters). However, in absence of nearby adjacent
stations, broadcasters are allowed to use more bandwidth; thus
theoretically allowing fairly high fidelity. Unfortunately, the AM
sections of most receivers (even high-end ones) are pathetic pieces of
crap that yield 3KHz or less of bandwidth.
Paul Cardinale
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| User: "" |
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| Title: Re: Public Radio |
11 Apr 2005 03:21:12 PM |
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The normal spacing of a.m radio stations in 10-Khz, so their
transmission bandwith is limited to slightly less to avoid sideband
splatter of adjacient broadcast channels.
FM bandwith is considerably higher, althoug I don't recall specific
values.
Harry C.
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| User: "Sam Wormley" |
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| Title: Re: Public Radio |
11 Apr 2005 10:12:03 AM |
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Warrick FitzGerald wrote:
Does anyone know how and at what quality normal radio audio is
transmitted at?
See: http://www.google.com/search?q=radio+modulation+bandwidth
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| User: "tadchem" |
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| Title: Re: Public Radio |
11 Apr 2005 01:48:12 PM |
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http://en.wikipedia.org/wiki/Band_%28radio%29
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