From the equation on the wiki, the max audible pulse channel frequency would be (1.79MHz/(16*(5+1)) = 18.64kHz. But I'm curious why BT's nessound.txt says the max square wave freq is only 12.4kHz. i know BT's stuff is old but it seems odd that he would get that wrong...am i missing something about the pulse channel that only allows it to go up to 12.4kHz?
Where'd you get the 5? Replace the 5 with an 8 and you have 12.4 kHz. Now where'd I get the 8? From APU Sweep: "When the channel's current period is less than 8 or the target period is greater than $7FF, the channel is silenced".
Aha!! Thanks tepples!! 
I picked 5 just because it was the minimum period value that would generate and audible frequency (i.e. under 20kHz).
tepples wrote:
Where'd you get the 5?
I picked 5 just because it was the minimum period value that would generate and audible frequency (i.e. under 20kHz).
This leads me to another question...should the noise channel also be silenced when the input period generates ultrasonic frequencies? For example, an input period of $0 to the noise channel results in a frequency of 1.79MHz/4 = ~447kHz.
It doesn't generate only ultrasonic frequencies, it's on or off irregularly enough that it makes audible noise.
Noise channel isn't just a simple square wave, it turns on and off whenever the shift register tells it to.
Noise channel isn't just a simple square wave, it turns on and off whenever the shift register tells it to.
Okay, awesome. I thought it might have something to do with the randomness but wanted to make sure. Thanks Dwedit!
What should be the best replacement for 5?
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tepples wrote:
Replace the 5 with an 8