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Minimum number of samples with AD1939 codec

Question asked by emi.rein on Nov 5, 2013
Latest reply on Nov 20, 2013 by emi.rein



The 21469-EZkit Lite board is equipped with an AD1939 codec. It appears that the minimum number of samples is 256. That is rather large with respect to latency between incoming and outgoing signals. In my application the overlap-save algorithm is used, which doubles the length of the FFT vectors to 512. That means that the "small" FFT accelerator cannot be used, only the >=512 version.

Doubling the sample frequency to 96 kHz is no option, because the length of some vectors doubles again and the needed amount of memory does not fit into internal memory.

Is there a method to lower the sample block length to 128 or 64?

Thank you for your response.