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Discussion Groups | Speech Coding | Help reg. using full rate GSM test vectors from ETSI

Technical discussions related to Speech Coding (all itu and other vocoders, ACELP, CELP, AMR, etc)

  

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Help reg. using full rate GSM test vectors from ETSI - Rajith M G - Nov 8 4:38:00 2002

Hi all,

I am currently using full rate GSM codec for our audio conferencing solution. As
far as the audio quality is concerned it is degraded a little bit due to some
code optimisations. So i would like to verify the bit exactness of the codec
using the test vectors provided by the ETSI, which i have downloaded from their
site. The*.inp file contains 584 frames of 160 2 byte data which should be given
as input to the encoder. Actually the encoder compresses the 160 13 bit samples
to 260 bits , which when rounded will give 33 bytes. But the test vector output
specified in the ETSI doc says number of input frame *76 * 2 as output. Could
any body please clarify what this really means.

Thanks in advance,

With best regs

Rajith



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