Re: [Freetel-codec2] Giving up natural sound for further bandwidth reduction

[Bruce Perens]

If I'm not mistaken, the version with statistical codebook training work by Jean-Marc runs at 1400 /without delta coding. /Delta coding would probably bring it to 1000 bits per second /without diminishing quality/. This is the "raw" codec without FEC, so this number goes up depending on how much FEC you insert.

    Thanks

    Bruce

To compare this to text, this is the equivalent of 200 5-bit teletype characters per second or 125 8-bit ASCII characters. So, we're around 5 to 8 times the rate we might achieve with "text robophone" - speech-to-text to text-to-speech, and maybe 3 to 5 times the rate we might achieve with "phoneme robophone" - the same but using phoneme data. Perhaps we could use a codebook approach to further compress the robophone data. But it hardly seems worthwhile, because we're already close to robophone rates with a real codec.

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