[sdiy] Hybrid (analog/digital) vocoder?

[cheater cheater]

Paul,
what filters you use for the carrier is completely up to you, also in
an analog design.

D.

On Mon, Feb 15, 2010 at 11:33, Paul Perry <pfperry at melbpc.org.au> wrote:
> My aim was to keep the carrier signal in the analog domain,
> and push the frequency spectrum detection into the digital part,
> and possibly construct the PWM control signals in the digital
> zone also.
> Optimistically, this would make feasible a MS20 filter style
> vocoder, surely a Good Thing ;D
>
> I don't deny that many very acceptable fully digital vocoders exist, of
> course.
>
> paul perry Melbourne Australia
>
> ----- Original Message ----- From: "cheater cheater" The digital domain will
> be much better for level detection of lower
> bands, and depending on how you realize it, the higher parts too. Of
> course you would need a separate audio ADC for each vocoder band. But
> one such chip is simpler than a whole level detector, and you can in
> that case also use different metering algorithms, which can change the
> character of the vocoder substantially. The signal can bypass the
> metering block and stay analog this way; the vca's shouldn't be
> difficult, simple multiplying DAC application.
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