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!