ECHO CANCELLATION S/W FOR TMS320C54X

This application note describes how to realize an Electrical Echo Canceller using the LMS instruction of the TMS320LC54x series DSP. Thanks to this compact instruction, it is possible to perform the Prediction Filter (FIR) and the weight updating at the same time. The software described is based on the Leaky Normalized Least Mean Square adaptive (LNLMS) filter with single precision (16 bit) coefficients. This software is able to cancel an echo path of up to 64 ms using only a few MIPS. It is also possible to implement more than one channel on the same LEAD without external memory (using LC548/9). This software can be easily customized to any echo path length.

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