Music – Instruments – Electrical musical tone generation
Patent
1994-03-24
1995-08-15
Witkowski, Stanley J.
Music
Instruments
Electrical musical tone generation
84604, 84607, G10H 702, G10H 712
Patent
active
054421276
ABSTRACT:
A memory stores waveform sample data for plural sample points forming a given tone waveform, and one of the stored waveform sample data stored for every two adjacent sample points is expressed in PCM representation while the other is in difference value representation that is based on the PCM values stored for two sample points on both sides of the sample point of the other sample data. The number of bits in each address of the memory is greater than the number of bits in each of the PCM data, and each of the PCM data is stored at some bit positions of one address, while the difference value data is stored at the remaining bit positions of one or more addresses. The waveform sample data stored in the memory are read out at a readout rate corresponding to a designated pitch and in the order of the sample points, but when at least the waveform sample data expressed in the difference value is read out, the PCM data stored for two sample points adjacent thereto are also read out along with the difference value data. The read-out difference data is reproductively demodulated into PCM representation, using the PCM data read out along with the difference data.
Shimizu Masahiro
Wachi Masatada
Witkowski Stanley J.
Yamaha Corporation
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