S-DSP/Pitch Counter

The Pitch Counter is a hidden register (not part of DSPRAM) that the S-DSP is modifying at the speed of 32kHz. It is at least 15 bits wide, of which:

• bits 4-11 are used as an index into the gaussian interpolation table (in one place fullsnes says bit 3 is used to index as well)
• bits 12-15 indicate which 4-bit sample-point within a BRR block

See Also

• The Infamous Bit-Of-Confusion

Reference

• https://problemkaputt.de/fullsnes.htm#snesapudspbrrpitch