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The Yamaha 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"). ==Sample-based synthesis component== The sample synthesis part is based on pulse-code modulation (PCM). It features: * Up to 24 simultaneous sounds (voices) * Output sampling frequency of 44.1 kHz (it can also accept 22.05-kHz samples – they are up-sampled to 44.1 kHz before output) * Waveform data lengths of 8, 12, or 16 bits * Stereo output (with a 4-bit/16-level pan for each voice) The PCM synthesizer part accepts: * Up to 4 MB of external memory for wave data * Up to 512 samples * External ROM or SRAM memory. If SRAM is connected, then wave data can be downloaded from the OPL4. * Chip select signals for 128 KB, 512 KB, 1 MB, or 2 MB memory can be output. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Yamaha YMF278」の詳細全文を読む スポンサード リンク
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