Tone signal generating device for interpolating and filtering st

Details Tone signal generating device for interpolating and filtering st Tone signal generating device for interpolating and filtering st

1991-09-04

1993-10-12

Shoop, Jr., William M.

Music

Instruments

Electrical musical tone generation

84661, 84DIG9, G10H 700, G11C zzzz, H03M 0000

Patent

active

052527735

ABSTRACT:
There are provided a waveform generating section for generating waveform sample data at a frequency corresponding a designated pitch, a coefficient generating section for generating n coefficients that correspond to a desired interpolation characteristic, a characteristic-controlling section for changing the coefficients to be generated in the coefficient generating section so as to variably control the interpolation characteristic, and an interpolation operation section for operating the coefficients with n digital waveform sample data generated sequentially from the waveform generating section and synthesizing operated data to produce one sample data. With this arrangement, it becomes possible to control the interpolation characteristic and therefore a resultant filter characteristic in accordance with a desired mode, when generating a tone signal of a smooth waveform by waveform interpolation operation utilizing digital filter operation. For example, the interpolation characteristic can be controlled in accordance with a pitch or tone range so that a filter characteristic to be obtained as the result of the interpolation operation can be prevented from shifting as a pitch or tone range changes. Further, by controlling the interpolation characteristic in correspondence with a specific tone range, such characteristic can be established as to reliably eliminate an aliasing noise.

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patent: 5157623 (1992-10-01), Hayashi

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