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Table of Gain Modes: Difference between revisions
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The [[S-DSP]] has five gain modes, to which Nintendo gave official names [1], but they are numbered differently by different emulator authors. | The [[S-DSP]] has five gain modes, to which Nintendo gave official names<sup>[1]</sup>, but they are numbered differently by different emulator authors. | ||
[[nocash]] numbers the gain modes with bits 5 & 6 of VxGAIN. [2] Note that direct gain mode uses these bits for the fixed volume instead and thus has no number in this scheme. | [[nocash]] numbers the gain modes with bits 5 & 6 of VxGAIN.<sup>[2]</sup> Note that direct gain mode uses these bits for the fixed volume instead and thus has no number in this scheme. | ||
[[Near]] numbers the gain modes with the top 3 bits of ADSR(1).[3] Note that when bit 7 is clear, bits 5 & 6 are "don't care" and thus Modes 0-3 are actually all the same - direct gain. | [[Near]] numbers the gain modes with the top 3 bits of ADSR(1).<sup>[3]</sup> Note that when bit 7 is clear, bits 5 & 6 are "don't care" and thus Modes 0-3 are actually all the same - direct gain. | ||
{| class="wikitable" | |||
| Official Nintendo Name | |+ | ||
| | ! Official Nintendo Name !! nocash numbering/naming !! Near numbering/naming | ||
| Direct Designation | |+ | ||
| Increase Mode (Linear) | Mode 2 = Linear Increase | Mode 6 (linear increase) | | '''Direct Designation''' || Direct Gain || Modes 0-3 (direct) | ||
| Increase Mode (Bent Line) | Mode 3 = Bent Increase | Mode 7 (two-slope linear increase) | |+ | ||
| Decrease Mode (Linear) | Mode 0 = Linear Decrease | Mode 4 (linear decrease) | | '''Increase Mode (Linear)''' || Mode 2 = Linear Increase || Mode 6 (linear increase) | ||
| Decrease Mode (Exponential) | Mode 1 = Exp Decrease | |+ | ||
| '''Increase Mode (Bent Line)''' || Mode 3 = Bent Increase || Mode 7 (two-slope linear increase) | |||
|+ | |||
| '''Decrease Mode (Linear)''' || Mode 0 = Linear Decrease || Mode 4 (linear decrease) | |||
|+ | |||
| '''Decrease Mode (Exponential)''' || Mode 1 = Exp Decrease || Mode 5 (exponential decrease) | |||
|} | |||
=== References === | === References === | ||
# [https://archive.org/details/SNESDevManual/book1/page/n170 page 3-7-4 of Book I], "GAIN" of the official Super Nintendo development manual | |||
# https://problemkaputt.de/fullsnes.htm#snesapudspadsrgainenvelope | |||
# https://github.com/ares-emulator/ares/blob/master/ares/sfc/dsp/envelope.cpp | |||
[[Category:Audio]] | |||
Latest revision as of 18:56, 21 July 2023
The S-DSP has five gain modes, to which Nintendo gave official names[1], but they are numbered differently by different emulator authors.
nocash numbers the gain modes with bits 5 & 6 of VxGAIN.[2] Note that direct gain mode uses these bits for the fixed volume instead and thus has no number in this scheme.
Near numbers the gain modes with the top 3 bits of ADSR(1).[3] Note that when bit 7 is clear, bits 5 & 6 are "don't care" and thus Modes 0-3 are actually all the same - direct gain.
| Official Nintendo Name | nocash numbering/naming | Near numbering/naming |
|---|---|---|
| Direct Designation | Direct Gain | Modes 0-3 (direct) |
| Increase Mode (Linear) | Mode 2 = Linear Increase | Mode 6 (linear increase) |
| Increase Mode (Bent Line) | Mode 3 = Bent Increase | Mode 7 (two-slope linear increase) |
| Decrease Mode (Linear) | Mode 0 = Linear Decrease | Mode 4 (linear decrease) |
| Decrease Mode (Exponential) | Mode 1 = Exp Decrease | Mode 5 (exponential decrease) |
References
- page 3-7-4 of Book I, "GAIN" of the official Super Nintendo development manual
- https://problemkaputt.de/fullsnes.htm#snesapudspadsrgainenvelope
- https://github.com/ares-emulator/ares/blob/master/ares/sfc/dsp/envelope.cpp