Re: [codec] Format for the codec specification

[Jean-Marc Valin <[e-mail]>]

Hi Roni,

Thanks for the correction on the case of G.719. Despite that, my point 
still stands: there *are* codecs for which the decoder is standardized 
without a bit-exact definition. As long as we define the amount of 
deviation permitted, then there is no problem.

Oh, and I do agree that the C code should take precedence over the 
mathematical description.

Cheers,

	Jean-Marc

On 10-09-24 06:06 PM, Roni Even wrote:
> 6.5 Description of the codec
> The description of the coding algorithm of this Recommendation is made in
> terms of bit-exact
> fixed-point mathematical operations. The ANSI-C code indicated in clause 10,
> which constitutes an
> integral part of this Recommendation, reflects this bit-exact, fixed-point
> descriptive approach. The
> mathematical descriptions of the encoder and decoder can be implemented in
> other fashions,
> possibly leading to a codec implementation which does not comply with this
> Recommendation.
> Therefore, the algorithm description of the ANSI-C code of clause 10 shall
> take precedence over the
> mathematical descriptions whenever discrepancies are found. A set of test
> signals, which can be
> used together with the ANSI-C code in order to verify bit-exactness, is
> available as an electronic
> attachment to this Recommendation.
>
>
> Roni Even
>
>
>