Sample rate display

[dangus]

Maybe a PLL (phase locked loop)? [edit] Yes, and you've explained the part I wasn't sure about: how to clean it up so the PLL would have something easier to digest.

If you don't need to measure the sample rate precisely, but just want to know if it's 32/44.1/48k, consider exploiting the VCO control voltage (from the PLL) rather than doing it all digital. That could (after some filtering and buffering) run a moving coil meter. (Get a cool vintage one from a ham radio swap meet.) Or, for a more "modern" (as in 1960s/'70s) look, use a linear scale bar graph display driver in dot mode to turn on lamps or LEDs for each rate of interest.

[staki]

Originally Posted by MiracleZZ

Here come the sch~

Ok ! very smart !! Thank you very much for the help ! I think I will use a PIC to make the counter.....

[staki]

Originally Posted by dangus

If you don't need to measure the sample rate precisely, but just want to know if it's 32/44.1/48k, consider exploiting the VCO control voltage (from the PLL) rather than doing it all digital. That could (after some filtering and buffering) run a moving coil meter. (Get a cool vintage one from a ham radio swap meet.) Or, for a more "modern" (as in 1960s/'70s) look, use a linear scale bar graph display driver in dot mode to turn on lamps or LEDs for each rate of interest.

That's funny indeed !
For something even funnier I could convert this voltage with an internal ADC from a PIC, and display it on a LCD.......