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Casio SD Synthesizers
Casio's SD ("Spectrum Dynamic") Synthesizers were a late-1980s line of hybrid digital-analog synthesizers featuring a resonant analog filter. SD synthesis was very similar to traditional DCO-analog synthesis, with the main difference being that some of the SD digital waveforms' harmonic spectrums changed temporally, or dynamically in relation to the amplitude envelope. SD synthesis is used in six Casio synthesizers and home keyboards released in 1987 and produced until 1991, when Casio exited the synthesizer market completely and focused solely on pure consumer keyboards. Due to some programming limitations plus Casio's poor marketing, the SD synths never gained wide popularity and are now fairly rare in the second-hand marketplace (which adds to their charm, according to some). There still exists a small but devoted fanbase who insist that SD synthesis, particularly as expanded in the high-end model HT-6000, was overlooked and highly underrated.
== Background ==
SD Synthesis followed on the heels of the more advanced Phase-Distortion (PD) Synthesis employed in the successful line of Casio CZ synthesizers. When Casio decided to retire the CZ line, they decided to go in two directions: more complex (the VZ "Interactive" Phase Distortion line), and more traditional (SD synthesis, starting with the HZ-600). In turning to SD synthesis Casio meant to create a synthesis engine that was more comprehensible and accessible than Phase Distortion synthesis. Yamaha's then-active lawsuit against Casio's PD synthesis method, which claimed PD synthesis infringed on patents of Yamaha's including their famous frequency modulation synthesis, may also have contributed to Casio's development of SD synthesis to diversify their offering.
The 1987 Casio HZ-600 was the initial model and was considered an entry-level offshoot of the "Z" series of synthesizers that included the CZ and VZ lines. The subsequent SD syntheizers were marketed as advanced home keyboards (i.e., including speakers and programmable accompaniment) launched under the HT prefix (with the notable exception of the non-editable, preset-only Casiotone version, the MT-600).
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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