Saturn Custom Sound Processor

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SCSP 1st version.

The Saturn Custom Sound Processor (SCSP) is manufactured by Yamaha and consists of several components.

The SCSP is a multi-function game sound generator LSI that consists of a PCM sound generator and DAC (Digital to Analog Converter). The SCSP creates and processes sound mixes. It contains a 32-slot sound generator and sound effect DSP, a 16-channel digital mixer and timer, and an interrupt controller. The Saturn's audio RAM is connected directly to the SCSP, and is used to store the sound programs (i.e. Cybersound) or raw waveform samples. The SCSP can support up to 32 channels for PCM playback, or eight channels for FM synthesis modulation. Maximum sample rate for PCM samples is 44.1 kHz (CD quality). The SCSP is MIDI compliant, and can be hooked up to external equipment (such as keyboards).

The 128 step DSP is capable of generating special effects such as reverberation and different room acoustics.

The entire SCSP is controlled by a single Motorola 68EC000 16-bit CPU running at 11.3 MHz. The MC68EC000 is essentially the same as (and compatible with) the M68000 used in the Sega Mega Drive and several other consoles, but without the eight-bit MC6800 interface. The SCSP can be directly accessed by the MC68EC000 and both SH2s.

The SCSP is limited by the small amount of RAM made available to it, and lack of hardware sample compression.

22.6 MHz Yamaha FH1 digital signal processor
Any of 32 slots can be linked together for multiple operators per FM sound channel
Usually four operators used per slot for eight FM channels total
44.1 kHz sampling rate