[sdiy] vocoder filters

[ColinMuirDorward]

I think maybe this has branched off from it's parent thread now, so I will
respond here. Thanks for the replies!

Take a look at speech CODECs like linear predictive coding, CELP, SPEEX,
etc. ...
A variant of this digital "vocoder" is used in the GSM baseband processing
that conveys speech over mobile phone networks with minimal bitrate

Oh I never correlated vocoding so directly with the telecom industry, but
of course it makes perfect sense that's where the tech would be developed.

Also check out Ray Wilson’s take with a very detailed writeup:
http://musicfromouterspace.com/index.php?CATPARTNO=NONE&PROJARG=VOCODER2013%2FVOCODER2013.php&MAINTAB=SYNTHDIY&SONGID=NONE&VPW=1024&VPH=500

Am I missing something? Ray Wilson's looks like fixed frequency BPFs.

If applied to music, probably one thinks of synthesizing singing or some
DESIRABLE vocal effect.  I tried this:

http://electronotes.netfirms.com/AES4.PDF


Inspiring read! I think I'll build that sawtooth phase shifter.


-Colin






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On Sat, Aug 31, 2019 at 7:25 PM Bernard Arthur Hutchins, Jr <
bah13 at cornell.edu> wrote:

> Of courses vocoders have “dynamic poles” (not fixed resonances) – else
> what is the point?  In the original application (Voice-Coder) the idea
> was to exploit the redundancy in human speech (10:1 to 50:1 - - said
> redundancy being the repetition of many very similar “cycles” in time that
> constitute a particular vowel/phoneme/syllable). Instead as few as three
> bandpass resonances might well represent a “frame” of 1/5 a second.  A
> loss of quality of stored/transmitted speech for a vast reduction of memory
> required (expensive in the early days). But clearly the resonant
> frequencies changed with each new frame encoded.
>
>
> If applied to music, probably one thinks of synthesizing singing or some
> DESIRABLE vocal effect.  I tried this:
>
>
> http://electronotes.netfirms.com/AES4.PDF
>
>
> The “animator” worked through a series of (LFO controlled – see Fig. 7) of
> POSSIBLE formant frequencies (phonemes both used and unused in a particular
> language).  It worked - it sounded human!  BUT basically like a human
> suffering from food poisoning!   Lesson learned.
>
>
> -Bernie
>
>
>
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