SEGA Confidential
2
1. SEGA Custom Sound Processor (SCSP)
1. Overview
· The clock speed of the SCSP chip is 22.58 MHz.
· The playback sampling frequency is 44.1 kHz.
· DMA is built in.
2. Generator
· PCM waveforms can be assigned individually to the 32 slots (oscillators)
separately. The standard AIFF format is used for the PCM waveform data, and
16-bit and 8-bit linear data are used. The ADPCM format is also supported. Each
of the slots has a completely independent LFO and envelope, and loop playback
of PCM waveforms can be set to any one of four modes: ONESHOT, FORWARD,
REVERSE and ALTERNATE.
·FM
One slot can be freely assigned as a carrier or a modulator, and a self-feedback
feature is also available. A waveform that can sufficiently stand up to
practical use can be output by the use of the self-feedback feature alone, in which
case the maximum FM output polyphony is 32 notes.
3. Built-in Sound DSP
· A sound DSP that can be programmed up to 128 steps is built in the SCSP. The 16
effects that are standard in the DSP library include Reverb, Early Reflection (ER),
Delay, Pitch Shift, Chorus, Flanger, Symphonic (type of Chorus), Surround (type of
Reverb), Voice Canceler, Auto Pan, Phaser, Distortion, Filter (high-pass, low-pass,
band-pass), Dynamic Filter, Parametric EQ, and Mixer. The addition of an expansion
library that includes 3D sound is currently under development.
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