Headset for hands-free wireless telephone
First Claim
1. A wireless telephone for receiving digitized voice information transmitted at a radio frequency, converting the received digitized voice information into a received audio signal on a speaker audio line, converting a transmit audio signal of a users voice on a microphone audio line into digitized voice information, and transmitting the digitized voice information at the radio frequency, the wireless telephone comprising:
- a microphone for receiving the user'"'"'s voice and generating the transmit audio signal on a microphone output;
a switch coupled in series between the microphoneoutput and the microphone audio linemeans within the wireless telephone coupled to the microphone audio line for providing a bias current to the microphonemeans having an input coupled to the microphone audio line and a binary output for generating a microphone current detect logic signal on the binary output when current is in the microphone audio line; and
a digital logic circuit having an input coupled to the binary output, the digital logic circuit including means responsive to the binary output for generating a ringing signal on the speaker audio line when an incoming call is received, means responsive to the binary output for answering the incoming call, and means responsive to binary output for placing an outgoing call.
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Accused Products
Abstract
A wireless telephone using an RF receiver unit and an RF transmitter unit and having a removable headset, the telephone and headset particularly suitable for applications where the RF transmitter unit is switched on and off at a frequency less than twenty kilohertz. The wireless telephone is coupled to the headset using a conventional stereo plug and jack. A headset detect logic signal is generated from the speaker audio line. A microphone current detect logic signal is generated from the microphone audio line. A digital logic circuit, preferably including a microprocessor, monitors the headset detect logic signal and microphone current detect logic signals and generates a programmed response to the headset detect logic signal. The programmed response reduces audible noise to the headset user, generates a ringing signal on the speaker audio line when an incoming call is received and allows the headset user to answer incoming calls, and place outgoing calls while touching only the headset. The wireless telephone and headset include circuitry to reject RF noise and circuitry to attenuate RF noise passed into the wireless telephone by a long multi-conductor wire coupling the headset to the wireless telephone.
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Citations
9 Claims
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1. A wireless telephone for receiving digitized voice information transmitted at a radio frequency, converting the received digitized voice information into a received audio signal on a speaker audio line, converting a transmit audio signal of a users voice on a microphone audio line into digitized voice information, and transmitting the digitized voice information at the radio frequency, the wireless telephone comprising:
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a microphone for receiving the user'"'"'s voice and generating the transmit audio signal on a microphone output; a switch coupled in series between the microphone output and the microphone audio line means within the wireless telephone coupled to the microphone audio line for providing a bias current to the microphone means having an input coupled to the microphone audio line and a binary output for generating a microphone current detect logic signal on the binary output when current is in the microphone audio line; and a digital logic circuit having an input coupled to the binary output, the digital logic circuit including means responsive to the binary output for generating a ringing signal on the speaker audio line when an incoming call is received, means responsive to the binary output for answering the incoming call, and means responsive to binary output for placing an outgoing call. - View Dependent Claims (2, 3, 4, 5)
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6. A wireless telephone having a headset and a handset, said wireless telephone comprising:
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a microphone in the headset a microphone audio line connecting the microphone in the headset to the handset means in the handset coupled to the microphone audio line for providing a bias current to the microphone in the headset means in the headset having an input coupled to the microphone audio line and a binary output for generating a microphone current detect logic signal on the binary output when current is in the microphone audio line; and a digital logic circuit in the headset having an input coupled to the binary output, the digital logic circuit including means responsive to the binary output for generating a ringing signal when an incoming call is received, means responsive to the binary output for answering the incoming call, and means responsive to binary output for placing an outgoing call. - View Dependent Claims (7, 8, 9)
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Specification