Musical tone generator utilizing digital sliding formant filter

Details Musical tone generator utilizing digital sliding formant filter Musical tone generator utilizing digital sliding formant filter

1977-10-06

1981-05-19

Witkowski, Stanley J.

Music

Instruments

84 119, 364724, G10H 100, G10H 102, G06F 738

Patent

active

042677610

ABSTRACT:
In a digital tone synthesizer of a type using digital data representing the amplitudes of a predetermined fixed number of sample points along one cycle of the audio waveform of a musical tone and an oscillator controlling the sampling frequency as well as the pitch of the tone, a digital filter for transferring the digital data to a digital-to-analog converter at the sampling rate. The digital filter, in response to applied input coefficient values, operates as a low pass or high pass filter in which the cut-off frequency is a predetermined harmonic of the pitch frequency of the tone. By changing the coefficient values, the cut-off harmonic can be changed for a tone independently of the pitch of the tone. Thus any tone of the musical scale may be filtered to modify the harmonic content independently of the pitch of the tone.

REFERENCES:
patent: 3515792 (1970-06-01), Deutsch
patent: 3878749 (1975-04-01), Woron
patent: 3939750 (1976-02-01), Inoue et al.
patent: 4101964 (1978-07-01), Betts
patent: 4114498 (1978-09-01), Chieana et al.
patent: 4122742 (1978-10-01), Deutsch
patent: 4149258 (1979-04-01), Yahata et al.
Rabiner & Gold, Theory and Application of Digital _Signal Processing, 1975, pp. 3, 9-10, 553-557, 663.
Hal Chamberlin, "A Sampling of Techniques for Computer _Performance of Music," BYTE, Sep. 1977, pp. 66-83.

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