About The Sy77: Rcm Hybrid Synthesis - Yamaha SY77 Operating Manual

About the SY77: RCM
The SY77's RCM hybrid tone generation system fuses the realism of digital samples with the expressive
power of FM. It uses Advanced Wave Memory 2 (AWM2) and Advanced Frequency Modulation (AFM) in
conjunction with digital filters to allow a wide variety of sound creation techniques.
Advanced Wave Memory
2 (AWM2)
Advanced Frequency
Modulation (AFM)
Dynamic touch and control
The possibilities of RCM
hybrid synthesis
10
AWM2 uses 16 bit linear sample reproduction with proprietary Yamaha con-
volution technology (digital filtering) that allows you to emphasize or cut any
desired portion of the frequency spectrum with full realtime control.
In addition to advancing beyond the FM synthesis capabilities of the DX7 and
previous Yamaha synthesizers, AFM allows you to filter and envelope any
AWM waveform and use the shaped waveform it as part of an FM algorithm to
apply frequency modulation, creating partials that were not present in the
original AWM waveform. This modulated waveform can be processed by addi-
tional digital filtering.
One of the greatest advantages of RCM hybrid tone generation is that it fuses
the realism of digital sampling with the expressive power of FM. Keyboard
dynamics and controllers can be used to control nearly any aspect of the sound,
allowing great musical expressiveness.
The SY77 allows a wide variety of synthesis techniques to be used, and digital
filtering is always provided for each AFM or AWM element. The following dia-
grams show how the RCM hybrid synthesis system can simulate many of the
analog and digital synthesizers of the past.
System diagram
Filter style "analog" synthesis: Single cycle AWM waveforms can be
enveloped and filtered to simulate analog synthesizers. (Various sawtooth
and pulse waves are provided, and the SY77's filters can be configured as
24dB/octave filters with resonance adjustable into oscillation.)
synthesis
hybrid