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Yamaha YMF278
The Yamaha YMF278 or YMF278B, also known as the OPL4 (OPL is an acronym for FM Operator Type-L), is a sound chip that incorporates both FM synthesis and sample-based synthesis (often incorrectly called "wavetable synthesis") by Yamaha.
The FM part is essentially a YMF262 (OPL3) block; thus, it is also backward-compatible with the YM3526 (OPL) and the YM3812 (OPL2). Like the OPL3, it can operate in one of four ways:
Four-operator FM allows more complex sounds but reduces polyphony.
Eight waveforms are available for the FM synthesis:
Unlike the OPL3, which has four channels for sound output, the OPL4 features six channels.
The sample synthesis part is based on pulse-code modulation (PCM). It features:
The PCM synthesizer part accepts:
For ROM wave data access, the Yamaha YRW801 2MB ROM chip can be connected to the OPL4. It holds approximately 330 samples, mostly 22.05-kHz 12-bit samples with some drums at 44.1 kHz. It is compatible with the General MIDI standard (128 melody sounds, 47 percussion sounds).
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Yamaha YMF278
The Yamaha YMF278 or YMF278B, also known as the OPL4 (OPL is an acronym for FM Operator Type-L), is a sound chip that incorporates both FM synthesis and sample-based synthesis (often incorrectly called "wavetable synthesis") by Yamaha.
The FM part is essentially a YMF262 (OPL3) block; thus, it is also backward-compatible with the YM3526 (OPL) and the YM3812 (OPL2). Like the OPL3, it can operate in one of four ways:
Four-operator FM allows more complex sounds but reduces polyphony.
Eight waveforms are available for the FM synthesis:
Unlike the OPL3, which has four channels for sound output, the OPL4 features six channels.
The sample synthesis part is based on pulse-code modulation (PCM). It features:
The PCM synthesizer part accepts:
For ROM wave data access, the Yamaha YRW801 2MB ROM chip can be connected to the OPL4. It holds approximately 330 samples, mostly 22.05-kHz 12-bit samples with some drums at 44.1 kHz. It is compatible with the General MIDI standard (128 melody sounds, 47 percussion sounds).