Method and apparatus for overriding a PTT switch to activate a microphone
First Claim
Patent Images
1. An apparatus, comprising:
- a microphone operable with a direct current (DC) bias voltage in both a first voltage range and a second voltage range;
a push to talk (PTT) switch electrically coupled in series with the microphone between the microphone and a microphone input; and
a voltage controlled switch circuit comprising a first transistor switch element coupled in parallel with the PTT switch, and a second transistor switch coupled to the first transistor switch that is operable to close the first transistor switch only when an input voltage on the microphone input is in the first voltage range, and to open the first transistor switch when the input voltage on the microphone line is not in the first voltage range.
2 Assignments
0 Petitions
Accused Products
Abstract
A method and apparatus for operating a bypass switch (124, 202) for bypassing a PTT switch (120) when a two-way radio device system (100) is to be operated in a hands-free mode responsive to a voltage applied to a microphone input line (114) in a pre-selected range.
-
Citations
18 Claims
-
1. An apparatus, comprising:
-
a microphone operable with a direct current (DC) bias voltage in both a first voltage range and a second voltage range; a push to talk (PTT) switch electrically coupled in series with the microphone between the microphone and a microphone input; and a voltage controlled switch circuit comprising a first transistor switch element coupled in parallel with the PTT switch, and a second transistor switch coupled to the first transistor switch that is operable to close the first transistor switch only when an input voltage on the microphone input is in the first voltage range, and to open the first transistor switch when the input voltage on the microphone line is not in the first voltage range. - View Dependent Claims (2, 3, 4)
-
-
5. A method, comprising:
-
detecting connection of an audio accessory to a two-way radio, the audio accessory containing a push to talk (PTT) switch coupled in series between a microphone and a microphone input of the audio accessory, a voltage controlled bypass switch connected in parallel with the PTT switch and operable to be closed upon application of a voltage above a threshold level on the microphone input; applying a first voltage level to the microphone input, the first voltage level being below the threshold level; detecting an indication to operate the microphone in a hands-free mode; and responsive to detecting the indication to operate in the hands-free mode, applying a second voltage level to the microphone input, the second voltage level being above the threshold level causing the voltage controlled bypass switch to close. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14)
-
-
15. A two-way radio device system, comprising:
-
a two-way radio operable to transmit and receive radio signals and including an accessory connector that has a speaker connection and a microphone input, and configured to apply a first voltage level to the microphone input for operating in a push to talk (PTT) mode and to apply a second voltage level to the microphone input for operating in a hands free mode; an audio accessory configured to be coupled to the two-radio at the accessory connector and including; a speaker operably coupled to the speaker connection; a microphone; a PTT switch operably coupled in series between the microphone and the microphone input; and a voltage controlled switch, including a PTT bypass switch element coupled in parallel with the PTT switch of the audio accessory, that is operable to close the PTT bypass switch element responsive to the second voltage level being applied to the microphone input, and to open the PTT bypass switch element responsive to the first voltage being applied to the microphone input. - View Dependent Claims (16, 17, 18)
-
Specification