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FM synthesis is a patented Yamaha method for using Frequency Modulation (FM) to produce complex
waveforms that can be controlled in musically useful ways.
Complex waveform
= interesting sound
Simple waveform
= boring sound
FM is a simple way to
make a complex
waveform
The advantage of FM synthesis is that waveforms with very complicated
harmonic structure can be simply and economically created, and controlled in
many different musically useful ways. In FM synthesis, one waveform is used to
modulate another waveform. Even if the two original waveforms are simple, the
result can be a complex and interesting sound.
In the following diagram, the upper oscillator is called the Modulator and the
lower oscillator is called the Carrier. The complexity or brightness of the result-
ing waveform that we hear will depend on the output level of the Modulator; i.e.,
as we increase the modulation, the complexity or brightness will increase.
Increasing the output level of the Carrier will simply increase the volume.
Interesting sounds change
over time
Many instruments have a characteristic pattern with which the sound changes
as time goes by. This "shape in time" is called the envelope. The following dia-
gram shows how a piano envelope differs from an organ envelope. A piano
begins loud and then gradually diminishes in volume and tonal complexity. An
organ however maintains the same volume and tone as long as the key is
pressed.
56
The basics of FM synthesis
Interesting sounds have
complex waveforms
The sounds produced by most musical instruments have a very complex wave-
form, which is constantly changing.
Electronic instruments use an oscillator to produce a waveform. Unfor-
tunately, electronic oscillators are best at producing simple and repetitive
waveforms. These waveforms sound "artificial" or "electronic", and are not
very interesting to listen to. A major concern of electronic musical instrument
design is to find a simple way to electronically produce a complex waveform and
be able to control it.
Содержание SY99
Страница 1: ...YAMAHA MUSIC SYNTHESIZER ...
Страница 13: ...1 ...
Страница 31: ...Front panel right side This page explains the front panel features to the right of the LCD 20 ...
Страница 43: ...32 ...
Страница 58: ...47 ...
Страница 61: ...50 ...
Страница 92: ...81 ...
Страница 93: ...82 ...
Страница 94: ...VOICE PLAY MODE 83 ...
Страница 95: ...VOICE PLAY MODE 84 ...
Страница 101: ...VOICE PLAY MODE 90 ...
Страница 189: ...VOICE EDIT MODE 178 ...
Страница 195: ...MULTI PLAY MODE 184 ...
Страница 196: ...MULTI EDIT MODE MULTI EDIT MODE This section explains the details of all Multi Edit parameters 185 ...
Страница 207: ...MULTI EDIT MODE 196 ...
Страница 211: ...SONG MODE Song Setup job directory Song Name 01 Receive Event 02 MIDI Control 03 Accent Level 04 Clock Beat 200 ...
Страница 259: ...PATTERN MODE 248 ...
Страница 300: ...APPENDIX 289 ...
Страница 301: ...APPENDIX 290 ...
Страница 314: ...APPENDIX Algorithm 13 Algorithm 14 Algorithm 15 Algorithm 16 Algorithm 17 Algorithm 18 Algorithm 19 Algorithm 20 303 ...
Страница 316: ...APPENDIX Algorithm 29 Algorithm 30 Algorithm 32 Algorithm 31 Algorithm 33 Algorithm 34 Algorithm 36 Algorithm 35 305 ...
Страница 317: ...APPENDIX Three carriers Algorithm 37 Algorithm 38 Algorithm 39 Algorithm 40 Algorithm 41 Algorithm 42 306 ...
Страница 318: ...APPENDIX Four carriers 307 ...
Страница 344: ...YAMAHA ...