Headset for hands-free wireless telephone
First Claim
1. A wireless telephone having an RF receiver unit for receiving digitized voice information transmitted at a radio frequency and converting the received digitized voice information into a received audio signal on a speaker audio line, the wireless telephone also having an RF transmitter unit for 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, wherein the RF transmitter unit is switched on and off at a frequency less than twenty kilohertz, the wireless telephone comprising:
- a headset jack for receiving a headset plug, the headset jack having a ground conductor, first and second movable conductors, and first and second stationary conductors, wherein each of the movable conductors are electrically isolated from the stationary conductors when a headset is plugged into the headset jack and the second movable conductor is coupled to the microphone audio line;
a first RF attenuation network coupled to the speaker audio line, the first movable conductor, and ground;
a second RF attenuation network coupled to the microphone audio line and ground; and
an audio amplifier having an input coupled to the second RF attenuation network and having an output coupled to the RF transmitter unit.
8 Assignments
0 Petitions
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.
135 Citations
13 Claims
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1. A wireless telephone having an RF receiver unit for receiving digitized voice information transmitted at a radio frequency and converting the received digitized voice information into a received audio signal on a speaker audio line, the wireless telephone also having an RF transmitter unit for 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, wherein the RF transmitter unit is switched on and off at a frequency less than twenty kilohertz, the wireless telephone comprising:
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a headset jack for receiving a headset plug, the headset jack having a ground conductor, first and second movable conductors, and first and second stationary conductors, wherein each of the movable conductors are electrically isolated from the stationary conductors when a headset is plugged into the headset jack and the second movable conductor is coupled to the microphone audio line; a first RF attenuation network coupled to the speaker audio line, the first movable conductor, and ground; a second RF attenuation network coupled to the microphone audio line and ground; and an audio amplifier having an input coupled to the second RF attenuation network and having an output coupled to the RF transmitter unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A headset for a wireless telephone operating in a time division duplex or a time division multiple access environment, the headset having an earphone capsule encasing a headset speaker and a microphone amplifier, and having a microphone cartridge housing a microphone wherein the microphone cartridge is mounted on a boom extending from the earphone cartridge, the headset comprising:
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a multi-conductor wire having a ground conductor, a speaker conductor, and a microphone conductor, wherein a lower portion of the multi-conductor wire is shielded and is adapted for coupling to a wireless telephone and an upper portion of the multi-conductor wire extends to the earphone capsule, wherein the headset speaker is electrically coupled between the speaker conductor and the ground conductor of the upper portion of the multi-conductor wire and the microphone amplifier has an output coupled to the microphone conductor; a first wire coupling to the ground conductor in the earphone capsule and passing from the earphone capsule through the boom to electrically couple to the microphone; a second wire coupling to an input of the microphone amplifier and passing from the earphone capsule through the boom to electrically couple to the microphone; a headset microphone positioned in the microphone cartridge and having a pair of leads coupled across the first wire and the second wires; and a first capacitor electrically coupled to the pair of leads of the microphone.
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Specification