[Speex-dev] Re: AEC frame size

Jean-Marc Valin Jean-Marc.Valin at USherbrooke.ca
Mon Jun 26 06:31:40 PDT 2006

> I am using speex-1.1.12 version AEC with the following configuration
> SAMPLE RATE : 8000Hz
> FRAME LENGTH: 32 , i.e. 4msec(125usec*32)
> TAIL LENGTH : 256 , 32msec
> I have configured AEC for ARM-920T, 200MHz
> Here are my observations
> [a] AEC CPU usage 50%

Normal for an ARM chip.

> [b] Still 10%trace of echo is still present

Not sure how you define 10%, but that's likely normal as well.

> NOTE: I am not using preprocessor as my cpu usage goes upto 99%

Normal, the preprocessor is using float ops.

> What should i do to increase the efficiency of AEC

Reduce the tail size or write some assembly (or use an ARM-optimized


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