Re: Real-time sound cyphering algorithm

From: Joseph Ashwood (ashwood_at_msn.com)
Date: 05/27/05 

Date: Thu, 26 May 2005 22:33:46 GMT

"Nicol So" <anonymous@no.spam.please> wrote in message
news:6Gble.225$zb.20@trndny04...
> Joseph Ashwood wrote:
>>
>> the
>> highest frequency that can be safely held by a CD is 22.05KHz, so you'd
>> only
>> have 22.05Kbps
>
> You confused bandwidth with channel capacity.

It was my impression that generally they functioned by oscillating between
+1/-1 to send a 1/0, not being an expert in modem technology I could be
wrong. Even going to the far reaches of current standard analog modem
technology (56Kbps) that still puts the bandwidth below the level of
acceptable MP3 (64Kbps). If you can achieve 112.5Kbps (which I would expect
to be extremely difficult with a speaker and microphone) you're now in
acceptable transfer speeds for real time voice. Come to think of it, I
believe there are codecs available that perform better than either MP3 or
Ogg when encoding a human voice (my assumption for the transfer I don't
remember it being originally stated), and even under different assumptions I
would assume there are possible codecs optimized for the various expected
transmissions.
                Joe