Envelope control apparatus

Details Envelope control apparatus Envelope control apparatus

1983-09-14

1985-08-27

Witkowski, Stanley J.

Music

Instruments

84 113, G10H 1057

Patent

active

045371105

ABSTRACT:
Under the presence of an internally generated mandolin clock (MDN) or an externally generated mandolin clock (MDN'), an envelope clock (ENV-CLK) obtained in accordance with a lower bit output having three-bit signals (including the LSB) is supplied through AND gates to an envelope counter. The counter is set in an up count state in response to an output from a flip-flop set in response to a key on pulse. When a carry signal is generated by the envelope counter, the counter is set in a down count state. In the latter case, the fourth-bit signal from the LSB of the output from the binary counter is gated through the AND gate. The envelope counter counts down the envelope clock (ENV-CLK) having a period twice that of the envelope clock (ENV-CLK) in the up count state.

REFERENCES:
patent: 3819844 (1974-06-01), Isii
patent: 4014238 (1977-03-01), Southard
patent: 4185532 (1980-01-01), Hiyoshi et al.
patent: 4253369 (1981-03-01), Hoskinson
patent: 4332183 (1982-06-01), Deutsch
patent: 4333377 (1982-06-01), Niezgoda et al.
patent: 4418601 (1983-12-01), Whitefield

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