If you have a way to modify the hardware, 8 bits at 8 KHz would work better
than 16 bits at 4 KHz.
On Sun, Jun 12, 2016 at 12:11 PM, Steve <[email protected]> wrote:
> The actual minimum speed in order to use the codec2 vocoder is the
> processing of 80 samples in 10 ms. The older speeds of 3200 and 2400 both
> use two of these segments, and the rest use four. These segments also
> require a lot of time to interpolate, and should be less than 20 ms for the
> older modes, and 40 ms for the newer modes.
>
> But that is only if you want to operate in real time. If you don't need
> real time, you can take as long as you want. I can think of a lot of
> communications, where non-real time would be "good enough".
>
> In playing with the vocoder, I have found the first few segments take more
> time, than after it gets going. So, the worse case is about the first 120
> ms of startup, then it averages much lower processing time.
>
> I did secure voice on a 10 MHz Z-80, but no vocoder :-) I just digitized
> the audio and shifted the time segments around, and then back to analog.
>
> Sometimes analog is good enough.
>
>
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