RS-PCM stands for ReSynthesized Pulse Code Modulation. Pulse Code Modulation (PCM) is a method used to digitally record waveforms. RS-PCM is a synthesis method developed by Roland in the late 1980s. Roland's U-series, including the U-220 sound module and the U-20 synthesizer, utilizes a form of RS-PCM synthesis. Simply recording and playing back the sound of an instrument using PCM does not suffice to produce a truly expressive and musical tone. RS-PCM sound generation leverages Roland's advanced signal processing technology to refine and resynthesize PCM-recorded sounds, resulting in realistic, dynamic, and highly playable musical tones. The RS-PCM approach is closely related to Additive Synthesis. It begins with recording audio using the PCM method, with the key process relying on Fast Fourier Transform (FFT). ReSynthesis analyzes the sine waves that were used to create the original sound by examining the FFT data from the recording. Using this analyzed data, the original sound is recreated through Additive Synthesis. While it is possible to perform transformation using the number of sine waves generated by Additive Synthesis, this method benefits from already prossessing a wealth of informaiton, enabling it to produce sounds that are remarkably close to the original.
Roland U-220 Sound Demos
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