[sdiy] Walsh Generators

[Scott Gravenhorst]

"Barry Klein" <Barry.L.Klein at wdc.com> wrote:
>Naïve question - can't this stuff be accomplished in software?

I think it was ASSI who posted that high computing power is required and that
general purpose CPU chips aren't fast enough for a significant number of
Walsh functions.

He also mentioned that there is no simple or perhaps even any discovered way
to manipulate Walsh coefficients based on standard FFT style input
information, i.e., to have a slider for the fundamental _sine_, another for a
2F _sine_, etc.  Without this, the human interface will lack the easy
intuitiveness that is present in sinewave additive synthesis.  Basically, the
interface will suck.

>
>-----Original Message-----
>From: owner-synth-diy at dropmix.xs4all.nl
>[mailto:owner-synth-diy at dropmix.xs4all.nl] On Behalf Of Glen
>Sent: Friday, March 18, 2005 9:20 AM
>To: music.maker at gte.net; synth-diy at dropmix.xs4all.nl
>Subject: Re: [sdiy] Walsh Generators
>
>At 12:07 PM 3/18/2005 , Glen wrote:
>
>>I wonder if several of these chips could easily be ganged together somehow,
>>for better quality results?
>
>I just did some calculating, and it seems that it would cost about $1280 to
>achieve an SNR equivalent to a good cassette tape deck (66dB), assuming
>that those chips could be easily ganged together. Surely, the situation
>isn't that bleak? Please, show me that I've made a terrible mistake in my
>estimate somewhere.
>
>The assumptions that I made for that estimate:
>
>1)   $20 per 31-function Walsh chip
>
>2)   You get a 6dB boost in SNR, for every DOUBLING of the number of Walsh
>functions. (I think that was on Neil's site, somewhere.)
>
>3)   These Walsh chips could simply be added together for higher levels of
>Walsh functions.
>
>
>thanks,
>Glen
>

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