Hi, I have been following your posts an I am a little confused about your goal. On one hand you mention a color organ, then you discuss that the output sounds like modem noise.
This chip is only intended to separate the amplitude of each bin of frequencies with a peak detector, then send those values to the output pin in sequence (as the strobe is clicked). Finally, the peak that was detected is decreased by 10% each time the value is read until the value reaches zero or a newly read value is higher that the current value left on the peak detector capacitor.
This setup is best (originally intended) to be used with a multiplexer and seven lm3915 logrithmic display chips that convert the output voltage to display the value.
This filter chip is only intended to be part of a graphic display of the seven frequency ranges, not as a pass-through for channel separation. It is not intended to be listened to - it will have a lot of switching noise and terribly distorted since it is a peak-detected value that is decayed in steps with each read instead of in a linear (or log) fashion.
Finally, your concern about detecting the beat was answered above when you noticed the bleed from other channels. Also, drums and bass will have higher order harmonics so it will definately show a pulse across all your channels (bins)
This chip is only intended to separate the amplitude of each bin of frequencies with a peak detector, then send those values to the output pin in sequence (as the strobe is clicked). Finally, the peak that was detected is decreased by 10% each time the value is read until the value reaches zero or a newly read value is higher that the current value left on the peak detector capacitor.
This setup is best (originally intended) to be used with a multiplexer and seven lm3915 logrithmic display chips that convert the output voltage to display the value.
This filter chip is only intended to be part of a graphic display of the seven frequency ranges, not as a pass-through for channel separation. It is not intended to be listened to - it will have a lot of switching noise and terribly distorted since it is a peak-detected value that is decayed in steps with each read instead of in a linear (or log) fashion.
Finally, your concern about detecting the beat was answered above when you noticed the bleed from other channels. Also, drums and bass will have higher order harmonics so it will definately show a pulse across all your channels (bins)