Hi,
As David pointed out, please read my blog post on the quantizer:
http://jmspeex.livejournal.com/10446.html
The fact that it combines VQ and prediction means that there is no
precise "resolution" on the pitch. The pitch error depends not only on
the frequency, but also on how continuous the original pitch is.
In general, I would say that one shouldn't expect codec2 to sounds
anything other than atrocious on music. That's just not what vocoders
are meant to code and it's not worth making voice worse just to make
music slightly less awful.
Cheers,
Jean-Marc
On 12-06-01 05:49 AM, Rick van Rein wrote:
> Hello Gullik,
>
>> I feel you are into something here. From what I believe, it is not
>> the absolute pitch though (unless you have absolute hearing ?? )
>> but the relation between various frequencies that is percieved
>> as on key or false.
>
> Indeed. Still, there is a need to use absolute frequencies
> for a codec, so there's nothing wrong with supporting the
> absolute values by incorporating the 440 Hz and vary around
> it.
>
>> How would this impact the necessary math? Working from sampling, discrete
>> time, what is the "natural" result in frequency?
>>
> David already corrected me that the current Codec2 actually
> uses a log scale, which is good. I am going to look into it to see
> if the steps of the scale work, or if mild modifications would
> make it work better for music, if needed. (And I am checking up
> on non-Western musical scales.)
>
>
> Cheers,
> -Rick
>
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