DSP Memory Region: Difference between revisions
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These four audio channels feed into three intermediate mixers. Two of these intermediate mixers are used for effects and aux. | These four audio channels feed into three intermediate mixers. Two of these intermediate mixers are used for effects and aux. | ||
== | == Frame Count == | ||
== Input Config == | |||
A 192 byte long structure. There are 24 of them. | A 192 byte long structure. There are 24 of them. | ||
| Line 93: | Line 95: | ||
| 180 | | 180 | ||
| u16 | | u16 | ||
| bits[0:1]: 1 = mono, 2 = stereo; bits[2:3]: buffer format | | bits[0:1]: 1 = mono, 2 = stereo; bits[2:3]: buffer format, bits[5]: fade in | ||
|- | |- | ||
| 182 | | 182 | ||
| u16 | | u16 | ||
| ADPCM predictor | | ADPCM predictor/scale | ||
|- | |- | ||
| 184 | | 184 | ||
| s16 | | s16 | ||
| ADPCM | | ADPCM y[n-1] | ||
|- | |- | ||
| 186 | | 186 | ||
| s16 | | s16 | ||
| ADPCM | | ADPCM y[n-2] | ||
|- | |- | ||
| 188 | | 188 | ||
| u16 | | u16 | ||
| bit[0]: | | bit[0]: ADPCM updated?; bit[1]: Is looping? | ||
|- | |- | ||
| 190 | | 190 | ||
| Line 134: | Line 136: | ||
| 8 | | 8 | ||
| u16 | | u16 | ||
| ADPCM | | 4 bits: ADPCM Predictor, 4 bits: ADPCM Scale | ||
|- | |- | ||
| 10 | | 10 | ||
| s16[ | | s16 | ||
| ADPCM | | ADPCM y[n-1] | ||
|- | |||
| 11 | |||
| s16 | |||
| ADPCM y[n-2] | |||
|- | |- | ||
| 14 | | 14 | ||
| u8 | | u8 | ||
| | | ADPCM dirty? | ||
|- | |- | ||
| 15 | | 15 | ||
| Line 157: | Line 163: | ||
|} | |} | ||
=== Simple Filter | === Simple Filter === | ||
This is a standard single-pole filter. The fall-off is 6dB per octave as you would expect. | This is a standard single-pole filter. The fall-off is 6dB per octave as you would expect. | ||
| Line 175: | Line 181: | ||
| a1 | | a1 | ||
|} | |} | ||
== Input status == | |||
Read only. | |||
== Input ADPCM coefficients == | |||
== DSP configuration == | |||
=== Delay Effect === | |||
Delay with feedback. | |||
Length of delay is a multiple of audio frames. There are 160 samples per audioframe. | |||
Feedback arm only has a gain on it. Under the feedback arm is a single-pole filter with the delay. | |||
=== Reverb Effect === | |||
== DSP status == | |||
Read only. | |||
== Output samples == | |||
Read only. | |||
PCM16. | |||
== Intermediate mix samples == | |||
Read/Write. | |||
PCM32. Also serves an aux function, allowing the ARM11 to apply custom effects to audio. | |||
== Compressor table == | |||
A precomputed response curve lookup table for the compressor. | |||