Method and apparatus for option control in a radio accessory

Details Method and apparatus for option control in a radio accessory Method and apparatus for option control in a radio accessory

1995-07-28

1997-07-15

Eisenzopf, Reinhard J.

Telecommunications

Transmitter and receiver at same station

Radiotelephone equipment detail

455 90, 455123, 455350, 455351, 4552001, 379420, 331103, 331109, 331123, H04B 138

Patent

active

056493070

ABSTRACT:
An option select scheme (300) and circuit (200) allows a single analog-to-digital (A/D) line (211) to be used between an accessory (204) and a portable radio (202) to control first and second accessory features (234, 236). First and second variable resistive devices (226,228) are used in conjunction with a push-to-talk switch (PTT) (230) to control the first and second accessory features (234, 236). The PTT switch (230) allows the first variable resistive device (226) to present a first voltage range to the A/D line (211) in a first state when the PTT switch (230) is depressed. The PTT switch (230) allows the second variable resistive device (228) along with bias resistor (224) to present a second voltage range to the A/D line (211) in a second state when the PTT switch (230) is not depressed. A third state exists when the accessory (204) is disconnected from the radio (202) and a third voltage range is presented to the A/D line (211).

REFERENCES:
patent: 4006396 (1977-02-01), Bogut
patent: 4792986 (1988-12-01), Garner et al.
patent: 5038400 (1991-08-01), Baracat et al.
patent: 5118309 (1992-06-01), Ford
patent: 5173795 (1992-12-01), Branan, Jr. et al.
patent: 5212722 (1993-05-01), Murata
patent: 5301360 (1994-04-01), Goldberg
patent: 5535433 (1996-07-01), Kurokawa et al.

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