Kawai K4 Owner's Manual page 28

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WAVE FORMS
mw The K4/K4r's Internal Waveforms
m AM (Ring Modulation)
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By combining the characteristics of PCM and DC waveforms, the K4/K4r allows free
creation of a wide variety of tones.
@ PCM Waveforms
Conventional synthesizers were able to produce only waveforms such as triangle or
sawtooth waves having comparatively simple harmonic configurations. They could
not produce metallic sounds and other tones with complicated harmonic
components. The K4/K4r has solved this problem by making use of PCM
waveforms.
Note: PCM, or Pulse Code Modulation, is a method of reproducing sounds such
as those of acoustic instruments by converting them into a digital signal and
recording them. The K4/K4r's internal PCM waveforms have a reproduction
quality equal to that of a CD.
@ DC (Digital Cyclic) Waveforms
DC waveforms consist of Cyclical PCM sounds which have been analyzed and
recombined so that they are easy to process. It is useful to combine DC waveforms
with PCM waveforms or with other DC waveforms for best results.
AM (Ring Modulation) is a system which combines two signals to create a single,
more complex signal. One waveform is used to modulate or cause a change in the
other, so unlike the DCF, which reduces harmonics, this system can produce new
harmonics which were not included in either original waveform, allowing the
creation of metallic, distorted or otherwise forceful sounds.
Note: Keep in mind that it is important to give careful consideration to the extent
of level modulation when using AM. (See P. 35)
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