Music – Instruments – Electrical musical tone generation
Patent
1994-04-26
1995-10-31
Witkowski, Stanley J.
Music
Instruments
Electrical musical tone generation
84622, 84627, G10H 1057, G10H 106, G10H 700
Patent
active
054631831
ABSTRACT:
A musical tone forming apparatus employed by an electronic musical instrument, comprises an external storage unit, a transfer DMA, a waveform RAM and a sound-source circuit. The external storage unit stores data representing a waveform of a musical tone, wherein the waveform comprises an attack portion and its remaining portion. The waveform RAM provides an attack-waveform storage area, exclusively used for storing attack-waveform data representing the attack portion, and a buffer storage area exclusively used for storing other waveform data representing the remaining portion. Before the production of the musical tone, the transfer DMA transfers the attack-waveform data to the waveform RAM, so that the attack-waveform data is stored in the attack-waveform storage area in advance. Thereafter, when a tone-generation instruction is given, the sound-source circuit reads out the attack-waveform data from the waveform RAM, so that the sound-source circuit forms a former part of the musical tone signal on the basis of the read attack-waveform data. At the same time, the transfer DMA transfers the other waveform data to the waveform RAM, so that the other waveform data are stored in the buffer storage area. After completely reading out the attack-waveform data, the sound-source circuit starts to read out the other waveform data from the waveform RAM, so that a latter part of the musical tone signal is formed on the basis of the read other waveform data. The former and latter parts of the musical tone signal are sequentially outputted from the sound-source circuit, so that one musical tone is produced.
Witkowski Stanley J.
Yamaha Corporation
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