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S-DSP/Noise
From SnesLab
Noise clock table
Hardware noise on the SNES is generated by a 15-bit Fibonacci linear feedback shift register. [1] Unlike the NES which has two hardware noise timbres, the SNES only has one.
Note that the noise sampling frequency is the perceived pitch (due to overtones) even though it is double (Nyquist) that of the fundamental. The Gaussian interpolator does not operate on the hardware noise generator.
| Value | Sampling Frequency | Pitch | Example |
|---|---|---|---|
| 00 | 0 Hz | off | |
| 01 | 16 Hz | C0 - 38¢ | |
| 02 | 21 Hz | E0 + 33¢ | |
| 03 | 25 Hz | G0 + 35¢ | |
| 04 | 31 Hz | B0 + 7¢ | |
| 05 | 42 Hz | E1 + 33¢ | |
| 06 | 50 Hz | G1 + 35¢ | |
| 07 | 63 Hz | B1 + 35¢ | |
| 08 | 83 Hz | E2 + 12¢ | |
| 09 | 100 Hz | G2 + 35¢ | |
| 0A | 125 Hz | B2 + 21¢ | |
| 0B | 167 Hz | E3 + 23¢ | |
| 0C | 200 Hz | G3 + 35¢ | |
| 0D | 250 Hz | B3 + 21¢ | |
| 0E | 333 Hz | E4 + 18¢ | |
| 0F | 400 Hz | G4 + 35¢ | |
| 10 | 500 Hz | B4 + 21¢ | |
| 11 | 667 Hz | E5 + 20¢ | |
| 12 | 800 Hz | G5 + 35¢ | |
| 13 | 1.0 kHz | B5 + 21¢ | |
| 14 | 1.3 kHz | E6 - 24¢ | |
| 15 | 1.6 kHz | G6 + 35¢ | |
| 16 | 2.0 kHz | B6 + 21¢ | |
| 17 | 2.7 kHz | E7 + 41¢ | |
| 18 | 3.2 kHz | G7 + 35¢ | |
| 19 | 4.0 kHz | B7 + 21¢ | |
| 1A | 5.3 kHz | E8 + 9¢ | |
| 1B | 6.4 kHz | G8 + 35¢ | |
| 1C | 8.0 kHz | B8 + 21¢ | |
| 1D | 10.7 kHz | E9 + 25¢ | |
| 1E | 16 kHz | B9 + 21¢ | |
| 1F | 32 kHz | B10 + 21¢ |
References
- page 3-7-8 of the official Super Nintendo development manual
- [1] https://github.com/ares-emulator/ares/blob/master/ares/sfc/dsp/dsp.hpp#L76