Tone signal generation device having a tone sampling function

Details Tone signal generation device having a tone sampling function Tone signal generation device having a tone sampling function

1988-01-05

1990-08-14

Witkowski, Stanley J.

Music

Instruments

Electrical musical tone generation

84604, 84627, 84630, 84633, 84DIG26, 381 51, 381 63, 360 741, G10H 1057, G10H 146, G10H 702

Patent

active

049477234

ABSTRACT:
A tone signal applied from outside is sampled by a tone sampling device and the sampled waveshape data is written into a memory. During this writing operation and in parallel with the writing operation, a zero crossing point of the waveshape in terms of the sample data of the tone signal is detected. A final address detection circuit stores, each time a zero cross has been detected, a write address of the waveshape sample data with respect to the memory. Address data which is stored in the final address detection circuit when the writing of the waveshape sample data in the memory has been completed is detected as a final address of the sampled waveshape data. The waveshape data in the memory is read out either in a forward direction in a reverse direction using this final address as a start point or an end point and a tone signal corresponding to the sampled waveshape data is sounded. Such address constituting the start point or end point of reading, i.e., a reference address, can be adjusted by a reference address adjuster. It is also possible, upon completion of the writing into the memory, to read out waveshape data immediately from the memory thereby to immediately and automatically sound the sampled waveshape data which has just been written into the memory.

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patent: 4681008 (1987-07-01), Morikawa et al.
patent: 4768413 (1988-09-01), Fujimori

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