Microphone-controller with multifunction, single conductor

Details Microphone-controller with multifunction, single conductor Microphone-controller with multifunction, single conductor

1989-12-20

1991-05-21

Ng, Jin F.

Telephonic communications

Audio message storage, retrieval, or synthesis

379 58, H04M 1100

Patent

active

050181882

ABSTRACT:
The single power conductor carries audio and a serial data bus. The microphone's amplifier (102) is connected to the conductor (108). The incoming audio signal rides on the DC supply voltage from the radiotelephone. The supply voltage, through a voltage regulator (103), supplies power to the amplifier (102) and a microprocessor (105), used to transmit the serial data message on the conductor (108). Both the amplifier (102) and the voltage regulator (103) are isolated from the power conductor (108) by a FET switch (104) that is controlled by the microprocessor (105). The switch (104) is turned off, isolating the circuitry when the microprocessor (105) is transmitting.

REFERENCES:
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patent: 4317222 (1982-02-01), Bell et al.
patent: 4378467 (1983-03-01), Ferrontelli
patent: 4455454 (1984-06-01), Umebayashi
patent: 4455534 (1984-06-01), Gillig
patent: 4499335 (1985-02-01), Lyle
patent: 4614839 (1986-09-01), Umebayashi
patent: 4654655 (1987-03-01), Kowalski
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patent: 4870676 (1989-09-01), Lewo
Motorola Inc., Publication No. 68P81115E38-D, published Nov. 5, 1985, V.S.P. Hands-Free Option, Model T375A Series.
Motorola Inc., Publication No. 68P81117E63-O, published Nov. 8, 1985, V.S.P. Hands-Free Option, Model T944 Series.

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