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Old 07-19-2007, 08:22 AM
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Default Re: A more rational approach -- how I would like to change the cell phone industry.

Jeff,

He typed the message on his Commodore 64 with an Atari floppy drive!



Jeff Liebermann <jeffl@cruzio.com> wrote:
> Radium <glucegen1@gmail.com> hath wroth:
>
> >On Jul 1, 7:24 am, shawn.cormi...@gmail.com wrote in
> >http://groups.google.com/group/sci.e...696d6abf90c8ed
> >13?hl=en&
> >> how would u like to change the cell phone industry?

>
> >Analog cell phones should stop using FM and should start using AM at
> >whatever practical radio frequencies available.

>
> Why bother? Analog cell phones are going away on Valentine's Day
> 2008.
> <http://dialzero.blogspot.com/2007/06...ice-to-end-aft
> er.html> I won't be sending you a valentine card. You're not my type.
> Are you also working on whale oil products and sealing wax?
>
> >Digital cell phones should stop using the compression they use and
> >start using monaural WMA compression with a CBR of 20 kbps or less and
> >a sample rate of at least 44.1 KHz.

>
> Oh, you want music over your cell phone? Of course that means fewer
> users per MHz. Very roughly, the current 8Kbits/sec encoding rate,
> compared to your 44Kbit/sec, will only handle about 1/5th the number
> of users. So, your cell phone bill goes up about 5 times. Of course
> you don't mind because you'll have hi-fi oozing out of your phone. You
> might want to research variable rate codecs, such as EVRC.
>
> >1. In its uncompressed form, the audio must have a bit-resolution of
> >at least 16-bit

>
> The encoding resolution is not changed by compression. If you encode
> something with 16 bit resolution, and compress it, you still have 16
> bit data coming out. It's the data rate or thruput that changes with
> compression.
>
> >2. The sample-rate of the compressed and the uncompressed version of
> >the audio must be the same.

>
> Not possible. If the rate in and rate out are identical, then there's
> no compression happening.
>
> At least you're consistent. You got everything wrong, again.


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