[speex-dev] Higher Bandwidth at lower quality settings

Trevor Yensen tyensen at sympatico.ca
Wed Feb 26 19:00:49 PST 2003

        I was wondering if anyone has experimented with Speex's wideband (16kHz)
mode at lower quality settings.  In particular I have been using quality 3,
and with wideband input files the resultant frequency spectrum is limited to
about an upper end around 3.5kHz (almost telephony quality bandwidth).  Has
anyone tried increasing the spectral bandwidth at the expense of lowering
the narrowband quality (ie using two very low bitrate codebooks, one for
narrowband and one for the 4-8kHz band - to match the same bitrate at
quality 3)? If you have can you comment on the quality?  (Looking through
the Speex code, I noticed that at lower quality settings wideband mode
basically reverts to narrowband.)
        Anyway, this is an experiment I plan on trying, but I was wondering if
anyone had any tips.


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