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Discussion Groups | Analog Devices DSPs | Moving an adaptive filter from 2115 to 2189
Technical discussions related to Analog Devices DSPs (including Blackfin, TigerSHARC, SHARC and ADSP-21xx DSPs).
Moving an adaptive filter from 2115 to 2189 - Dave Tiefenbrunn - Mar 24 16:17:00 2003
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Hi, all. I am new to DSP - started about Jan 1 '03. I am working with the 2189 EZ-LITE and EZ-ICE. We have an LMS line echo canceller running on an ADSP2115 with SGS ETC5064 uLaw codecs (with built in 300-3KHz band pass filters). I have adapted the assembler code to run on the ADSP2189 with the AD73322 codec. The echo cancellation does not work as well as the original system, especially on lower frequencies. If I put an analog high pass filter on the pink noise generator, I get better cancellation than full bandwidth pink noise, but not as good as the original system. The slope of the analog filter is not as steep as the filter built into the ETC codec. Could this be what I am fighting? Thank you, Dave |
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