Communication unit for code generation and voice communication

Details Communication unit for code generation and voice communication Communication unit for code generation and voice communication

1977-07-20

1978-08-29

Claffy, Kathleen H.

Oscillators

Relaxation oscillators

179 84VF, 331116M, H04M 150

Patent

active

041105613

ABSTRACT:
Communication units for hand-held use, combining a microphone for voice communication with means for generating at least two code frequencies for signaling, are made more compact and economical by dual capability of a single amplifying circuit in oscillating mode for tone generation and in substantially linear mode for amplifying the microphone output.

REFERENCES:
patent: 3713045 (1973-01-01), Usuda et al.
patent: 3939418 (1976-02-01), Morrison et al.
patent: 3970801 (1976-07-01), Ross et al.

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