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TIA Sound Question


walker7
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Can someone clearly explain the bit pattern for TIA audio distortions 2 and 3? This is what I know so far:

 

Distortion 2: 001010000111011->0100000000000000000100000000000 (465 bits long)
Distortion 3: 001010000111011->0010110011111000110111010100001 (465 bits long)

 

These are named "DIV31_POLY4" and "POLY5_POLY4" in the tiasound.c document.

<http://web.archive.org/web/20120705120940/http://mamedev.org/source/src/emu/sound/tiasound.c>

 

What exactly is going on here?

 

 

Also, I noticed that distortion 11 is called "POLY5_POLY5", even though it makes no sound (same as distortion 0). Any reason that name was chosen? The only reason I can think of is that it matches up with distortions 2, 3, and 10:

2 = "DIV31_POLY4"

3 = "POLY5_POLY4"

10 = "DIV31_POLY5"

11 = "POLY5_POLY5"

Edited by walker7
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