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Re: Hardware Sound Compression?

From: (Eric LaForest)
Date: Mon, 2 Nov 1998 11:29:39 -0500 (EST)

>
>On Sun, 1 Nov 1998, Rodney Arne Karlsen wrote:
>
>> I think if you converted the audio to 1bit information like in an audio CD
>> that would bring down the size. 1 bit  vs. 16 bit at same quality. I am not
>> shure how the 1 bit DAC works, baybe somone in the group could explain it to
>> us.

I'm just beginning to grok DSP, and this is one aspect of it.
There are some methods for doing D/A conversion which invlove downsampling
from 16bits to 1 bit but at a much higher rate, this stream can then be
low-pass filtered directly to get audio.  The advantage is that more of
the process can be integrated into digital circuitry.  No audio space
saving is done. 

>I'm not sure about how 1-bit DAC works, either, although I suspect that it
>is something that decreases a manufacturer's costs more than it increases
>sounds quality. I think they put it on portable CD players for purely
>marketing reasons, eg. "Now with 1-bit DAC and Fritzen Jammin circuits!"
>In any case, CDs still store the audio information in 16 bit per sample
>per channel, 44,000 (or is it 48,000? I forget) samples per second. Sum
>total: about 10MB per minute of music.

<snip>

>
>Paul Archer
>
>----------------------------------------------------
>A key to the understanding of all religion is that
>a god's idea of amusement is Snakes And Ladders with
>greased rungs.   -- Terry Pratchett, "Wyrd Sisters"
>----------------------------------------------------

--
Eric LaForest      Nascent Linux Borg     -www.ncf.carleton.ca/~di458-
#define Hacker !(Cracker)  //FYI: http://sagan.earthspace.net/~esr/
Breaking into computers does not make one a hacker, for the same reasons
that hotwiring cars does not make one a mechanic... paraphr. from ESR

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