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13 Aug 2020 19:03:56 UTC
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3e718888a9d02086d8cfbb16730652ad8fb23ffca163fe468849a2ad0e7e1f8d
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Phase Shifting with DSP using the Teensy
In this video I do some DSP Phase shift processing with the Teensy 4.0

Big shout out to Charlie Morris' channel for all the inspiration. Lots of great stuff on his channel
https://www.youtube.com/channel/UCSNPW3_gzuMJcX_ErBZTv2g

The Teensy and the Audio Shield
https://www.pjrc.com/store/teensy40.html
https://www.pjrc.com/store/teensy3_audio.html

Correction: I meant to say "I2S" not I2C

Here's the Iowa Hills software site
http://www.iowahills.com/
I am using the Hilbert Filter from this page
http://www.iowahills.com/8DownloadPage.html

Note I missed out a critical parameter in the Hilbert filter configuration and that is you have to put in the desired phase offset in the "Phase Add" field (i.e. +45 and -45)

Here's some DSP theory pages. The convolution algorithm
https://shulgadim.blogspot.com/2012/01/fir-filter-implementation.html

A good reference source
https://www.dsprelated.com/freebooks/filters/

Finally the code and coefficients
https://github.com/thaaraak/TeensyDSP
...
https://www.youtube.com/watch?v=DTO9gGOFIFY
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