Microprocessor tone synthesizer with reduced quantization error

Details Microprocessor tone synthesizer with reduced quantization error Microprocessor tone synthesizer with reduced quantization error

1978-09-18

1980-07-15

Malzahn, David H.

Boots, shoes, and leggings

328 14, 364703, G06F 102, H03B 1900

Patent

active

042131855

ABSTRACT:
The accuracy of a required tone set, digitally synthesized by a microprocessor, is improved beyond the theoretical limit of the microprocessor circuitry by producing each tone at a frequency which is a sub-multiple of the desired frequency, then multiplying to provide the desired frequency. With the addition of a multiplier such as a doubler, a better choice of oscillator frequency becomes possible which further increases the tone frequency accuracy. The microprocessor can also reduce the start up time and the time between tones, eliminating delays in transmitting a series of coded tones.

REFERENCES:
patent: 3446947 (1969-05-01), Overstreet, Jr.
patent: 3787836 (1974-01-01), Hagelbarger
patent: 3946321 (1976-03-01), Krolik
patent: 3982199 (1976-09-01), Green
patent: 3999049 (1976-12-01), Roche et al.

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