Re: (OT?): Could DTV become the new Radio
- From: mzenier@xxxxxxxxxx (Mark Zenier)
- Date: Mon, 24 Jul 2006 16:00:43 GMT
In article <44C3C60E.1070506@xxxxxxxxxxxxxxx>,
Doug Smith W9WI <w9wi@xxxxxxxxxxxxxxx> wrote:
Mark Zenier wrote:
Could the sub-channels available on digital Television become a competitor
to local radio.
Digital TV has high power broadband high bit rate (18-20 megabits per second)
transmitters that cover the metropolitan areas.
What's stopping a TV station from generating music channels that use the
high bandwidth MP3 audio and the minimum necessary video signal to go
along with it? If you got the bit stream down to around a half a megabit
per second or less, any or all TV stations could transmit a half a dozen
of these and still have room for HDTV. The video could be minimal,
a low frame rate "slide show" akin to what you could get over the web.
Then all you would need was another little widget with a tuner and
some minimal processing to feed it into a video iPod. Or no video
if don't want to bother with the pictures.
At least one PBS-affiliated DTV station is doing just that, carrying the
audio of an associated radio station.
There really doesn't need to be any video at all. The ATSC protocol
treats audio and video as separate streams; a mapping table tells the TV
receiver to pluck the video stream on protocol ID 0x0044 and the audio
stream on 0x0041 and combine them into a TV program called channel 4-1.
There is nothing that requires the 0x0044 video stream to exist - you
could transmit *only* the audio stream. How a typical ATSC TV would
handle that I don't know; my bet would be that it would show a blank
screen. (while playing the audio normally)
Ah, yes. That way they can have audio tracks for different languages.
With the possiblity of a couple dozen 200-350 kbps MP3 (or whatever)
audio broadcasts in each metro area, why are the IBOC guys even
bothering?
Mark Zenier mzenier@xxxxxxxxxx
Googleproofaddress(account:mzenier provider:eskimo domain:com)
.
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