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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

Hi,

 

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.

https://wiki.analog.com/resources/tools-software/sigmastudio/toolbox/adialgorithms/pitchmodification/pitchtransposer

 

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!

Jim.

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