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Karaoke key change using ADI pitch transposer alogrithm

Question asked by jimyam on May 31, 2017
Latest reply on Jun 29, 2017 by jimyam



I would like to implement the key change function for a karaoke machine using ADAU1451.


I tried the ADI pitch transposer algorithm for the key change function.


First, I don't know how to set the parameters  'Delay Reserved', 'Frequency Shift Slider', and 'Max Shift' to achieve +/-4 semitones pitch change. The information in the wiki Analog Devices doesn't show clearly how to set those parameters.


Second, I set 'delay reserved' to 1000, while the 'max shift' is 100. I can heard obviously that the volume does not keep stable, like vibrato effect . Can it be more stable?


Thanks in advance!