Automatic rhythm generator

Details Automatic rhythm generator Automatic rhythm generator

1979-09-14

1981-01-06

Witkowski, S. J.

Music

Instruments

84DIG11, 84DIG12, G10H 142, G10H 700

Patent

active

042429366

ABSTRACT:
An automatic rhythm generator for use in an electronic organ is made more efficient, from the standpoint of rhythm pattern storage, by use of a zero suppression technique. Null instructions, the sole function of which is to allow a clock interval to pass without sounding an audible beat, are eliminated entirely from storage, and thus do not consume any memory capacity. In order to skip the necessary silent clock intervals before the next audible beat, each beat instruction which is stored at a memory address may include an encoded skip instruction commanding a number of clock intervals to be skipped before passing on to the next beat instruction at the next memory address. Alternatively, the skip instruction, in a stored program instrument, may come from software. In either case, the skip instruction controls a programmable frequency divider, which causes clock interval skipping by dividing down the clock frequency to a lower rate before it reaches the memory address counter. The number of clock intervals skipped, for a frequency division ratio of n, is n-1. Thus, a frequency division ratio of one causes zero clock intervals to be skipped. A maximum frequency division ratio of four, encoded in a two-bit word, skips three clock intervals, which is adequate for all practical situations.

REFERENCES:
patent: Re29144 (1977-03-01), Bunger
patent: 3743755 (1973-07-01), Watson
patent: 3958483 (1976-05-01), Borrevik et al.
patent: 4010667 (1977-03-01), Kniepkamp
patent: 4120225 (1978-10-01), Dietrich et al.
patent: 4127048 (1978-11-01), Schmoll
patent: 4135423 (1979-01-01), Gross
patent: 4138918 (1979-02-01), Kato
patent: 4163407 (1979-08-01), Solender
patent: 4186639 (1980-02-01), Robinson et al.

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