ChengWei
2010-Aug-16 05:22 UTC
[Speex-dev] A question in the document of wide-band encoding.
Dear Jean-Marc: in Section Speex wideband mode (sub-band CELP), Subsection Bit allocation of the speex manual, you pointed out that the mode ID of wideband is 3 bits (it is consistent with the source code), however, in the following table (Table Quality versus bit-rate for the wideband encoder), there are 11 different modes (from 0 to 10). I am confused about this inconsistency, as 3 bits can only provide 0 to 7. Did I miss something in the document? Thanks a lot in advance. Best Regards, Cheng Wei
Jean-Marc Valin
2010-Aug-18 02:33 UTC
[Speex-dev] A question in the document of wide-band encoding.
The three bits are only for the high band. There are still four mode bits for the lower band. A wideband stream is made up of a narrowband stream and a high-band stream. Jean-Marc On 10-08-16 01:22 AM, ChengWei wrote:> Dear Jean-Marc: > > in Section Speex wideband mode (sub-band CELP), Subsection Bit > allocation of the speex manual, you pointed out that the mode ID of > wideband is 3 bits (it is consistent with the source code), however, > in the following table (Table Quality versus bit-rate for the wideband > encoder), there are 11 different modes (from 0 to 10). I am confused > about this inconsistency, as 3 bits can only provide 0 to 7. Did I > miss something in the document? Thanks a lot in advance. > > Best Regards, > Cheng Wei > _______________________________________________ > Speex-dev mailing list > Speex-dev at xiph.org > http://lists.xiph.org/mailman/listinfo/speex-dev > >