Linear arithmetic synthesis

Sound structure of the D-50 (P=PCM and S=synthesizer sound generators)

Linear arithmetic synthesis, or LA synthesis, is a means of sound synthesis invented by the Roland Corporation when they released their D-50 synthesizer in March 1987. It is a hybrid oscillator technique that creates a complex waveform by using a sample for the attack portion of a sound's envelope followed by a smooth transition to a simpler digital oscillator waveform. LA synthesis combines conventional subtractive synthesis with PCM-based samples. It was invented by Ikutaro Kakehashi, President of Roland. It is implemented by a single IC chip inside a synthesizer. An example of this is the LA32 chip used in the Roland MT-32 and other LA synthesizers.

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