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ADSP 21489: Talkthrough_IIR_Accelerator - Channel inversion?

Question asked by TABWE on Apr 30, 2012
Latest reply on May 3, 2012 by Mitesh

Dear all,

 

I'm working with a ADSP 21489 EZ-Kit Board and did some testing with the Talkthrough_IIR_Accelerator example included with Visual DSP. However, I'm stuck on a problem with seperating left and right channel talkthrough.

 

When I disable one channel in the process_audio.c file by multiplying the IIR accelerator's result with filter gain 0 (see function process_audio, line 135ff) the OTHER channel is cancelled out while the one multiplied by zero stil talks through. I've checked that my test setup (wiring) is correct by using one of the TDM-based examples, e.g. "21489 AD1939 C Block-Based Talkthru 48 or 96 kHz".

 

I haven't done any other modifications to the supplied example and would be happy if someone could try to reproduce this and/or come up with a solution on how to fix this inversion.

 

Every help is appreciated,

 

Regards.

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