[speex-dev] frame size

Jean-Marc Valin Jean-Marc.Valin at USherbrooke.ca
Thu Oct 23 08:32:50 PDT 2003

Sorry, there is only one frame size possible, (which you can get with
SPEEX_GET_FRAME_SIZE in the C version). Basically, it's 20ms for
"nominal rates":
narrowband: 160 samples
wideband: 320 samples
ultra-wideband: 640 samples


Le jeu 23/10/2003 à 09:29, Ulrich B. Staudinger a écrit :
> hello,
> i have a simple question about speex frame size.
> i work with jspeex - but i think it's speex generic, the question i have.
> can i use any frame size i want? or does the size have be in a certain 
> ratio to other numbers? and what does the frame size in the decoder 
> mean? encoded or decoded packet frame size?
> how much data can i hand to the encoder to encode?
> if i hand i.e. 400 bytes to the encoder, what will i have in return? 180 
> bytes of encoded data?
> in gsm it was all so simple... i have 320 bytes and get 133 in return 
> .... (i think those were the numbers).
> thanks for an answer,
> ulrich

Jean-Marc Valin, M.Sc.A., ing. jr.
LABORIUS (http://www.gel.usherb.ca/laborius)
Université de Sherbrooke, Québec, Canada

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