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Audio phase shift circuit design wanted.

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magic:

--- Quote from: Jim-0000 on July 10, 2019, 01:01:26 pm ---So, the phase shift (of 180 deg) will need to be adjustable for any frequency over the audible spectrum.

--- End quote ---
Then you simply want an inverting opamp stage.

But as others pointed out, you can't cancel a signal that you can't measure in real time.

SiliconWizard:
What are still commonly used as a way of relief for tinnitus are masking signals. They are often some kind of broadband noise, such as filtered and/or modulated white noise.
For those interested in knowing a bit more: http://www.tinnitusjournal.com/articles/use-of-masking-for-tinnitus.pdf
( https://www.tinnitus123.com/tinnitus-maskers/ )

ogden:

--- Quote from: Jim-0000 on July 10, 2019, 01:01:26 pm ---I want to invert the phase of perceived (or actually heard) frequency of a Tinnitus sufferer.
So, the phase shift (of 180 deg) will need to be adjustable for any frequency over the audible spectrum.

--- End quote ---

180 degree phase shift for any frequency or just broadband noise is simple DSP task - invert polarity of waveform/signal. Problem in your case is - you do not have waveform nor signal to invert. Basically your idea of creating 180-degree phase shifted sound to cancel Tinnitus sufferer is impossible. If you say that it is possible then why don't you earn money winning lotteries and trading stocks?

[edit] Audiogury pretty much explained why (it is not possible).

Audioguru:
I hate to hear acid rock or Rap because they are broadband noise. Instead of hearing noise to mask tinnitus then maybe good music would be better.

Jim-0000:

--- Quote from: SiliconWizard on July 11, 2019, 01:19:48 pm ---What are still commonly used as a way of relief for tinnitus are masking signals. They are often some kind of broadband noise, such as filtered and/or modulated white noise.
For those interested in knowing a bit more: http://www.tinnitusjournal.com/articles/use-of-masking-for-tinnitus.pdf
( https://www.tinnitus123.com/tinnitus-maskers/ )

--- End quote ---

Thanks for the reply. I will read the link. More later.

Jim.

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