Karaoke key change using ADI pitch transposer alogrithm

Thread Summary

The user asked about implementing a key change function for a karaoke machine using the ADAU1451 and the ADI pitch transposer algorithm. The final answer explained that the standard pitch transposer causes vibrato due to splices in the circular buffer and suggested using a Lookup Table (LUT) to achieve +/-4 semitones pitch change, with the LUT values determined empirically. The user also inquired about evaluating base10 labs' advanced pitch shifter and whether the ADI pitch transposer uses PSOLA, to which the engineer confirmed the potential need for a custom developer for better performance and that the ADI pitch transposer likely uses a PSOLA-like method.
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