Tone signal generating system for use in communication apparatus

Details Tone signal generating system for use in communication apparatus Tone signal generating system for use in communication apparatus

1988-01-19

1989-09-12

Moore, David K.

Communications: electrical

Audible indication

Ultrasonic pest control

340384R, G08B 300

Patent

active

048664154

ABSTRACT:
A tone signal is formed by repeatedly reading out digital data stored in a memory device. Thus a predetermined tone wavefrom signal is stored in the memory device as data corresponding to the amplitude value at a plurality of sampling points and the data are repeatedly read out at a predetermined speed. A quasi sine wave signal is formed based on the read out signal. Harmonic components are eliminated from the quasi sine wave signal with a lowpass filter, thereby forming a desired tone signal.

REFERENCES:
patent: 3624302 (1971-11-01), Bishnu et al.
patent: 4271495 (1981-06-01), Scherzinger et al.
patent: 4351999 (1982-09-01), Nagamoto et al.
patent: 4386340 (1983-05-01), Satoh
patent: 4449232 (1984-05-01), Hashimoto et al.
patent: 4475228 (1984-10-01), Vickers
patent: 4560978 (1985-12-01), Lemelson
patent: 4577343 (1986-03-01), Oura

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