Audio-output for a portable radio telephone utilizing a vehicle's AM/FM radio
First Claim
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1. An accessory connectable to a portable radiotelephone, comprising:
- an input connection terminal for connecting to the portable radiotelephone;
a radio transmitter, adapted to receive audio signals produced in a receiving section of the portable radiotelephone, for modulating a radio frequency (RF) signal using the received audio signals and transmitting the modulated RF signal at low power in a commercial radio broadcast band for radios; and
a call activity detector detecting call activity at the portable radiotelephone.
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Abstract
A wireless telephone communication device is operated in a hands-free mode with detected received audio being relayed for output on the speakers of a radio. A single two-frequency FM transmitter or a multi-frequency transmitter that transmits simultaneously on a plurality of channels relays the audio to the FM radio.
115 Citations
19 Claims
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1. An accessory connectable to a portable radiotelephone, comprising:
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an input connection terminal for connecting to the portable radiotelephone; a radio transmitter, adapted to receive audio signals produced in a receiving section of the portable radiotelephone, for modulating a radio frequency (RF) signal using the received audio signals and transmitting the modulated RF signal at low power in a commercial radio broadcast band for radios; and a call activity detector detecting call activity at the portable radiotelephone. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An accessory for a portable radiotelephone, comprising:
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an input connection terminal for connecting to the portable radiotelephone; a radio transmitter, adapted to receive audio signals produced in a receiving section of the portable radiotelephone, modulating a radio frequency (RF) signal using the received audio signals and transmitting the modulated RF signal in a commercial broadcast band for radios, and a call activity detector detecting call activity at the portable radiotelephone, wherein said radio transmitter transmits simultaneously on a plurality of channels in the FM broadcast band. - View Dependent Claims (11)
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12. A communications system for use in an automobile, comprising:
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a mobile radio telephone unit including; a radio transceiver transceiving in a mobile radio frequency band, and a radio transmitter wirelessly transmitting at low power in a commercial radio broadcast band signals received from the radio transceiver, and a radio including; a first speaker, and a receiver for receiving wireless transmissions in the commercial radio broadcast band, processing the received transmissions, and providing the processed transmissions to the first speaker, wherein when a call is received by the mobile radio telephone unit, the radio transceiver provides an audio signal corresponding the call to the radio transmitter, the radio transmitter wirelessly transmits the audio signal in the commercial radio broadcast band, and the receiver receives the transmitted signal and provides the audio signal to the first speaker. - View Dependent Claims (13, 14, 15, 16)
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17. A method of radio communications of a voice signal modulated onto a radio frequency (RF) signal in a portable radiotelephone frequency band, comprising the steps of:
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receiving the voice-modulated, RF signal in a portable radiotelephone; converting the received, voice-modulated RF signal into a voice-modulated RF signal in a commercial radio broadcast frequency band different from the portable radiotelephone frequency band; wirelessly transmitting the voice-modulated RF signal in the commercial radio broadcast frequency band at low power; receiving in a radio receiver the wirelessly-transmitted, voice-modulated RF signal in the commercial radio broadcast frequency band; and extracting the voice signal from the wirelessly transmitted voice-modulated RF signal in the commercial radio broadcast frequency band and providing the extracted voice signal to a speaker coupled to the radio receiver. - View Dependent Claims (18, 19)
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Specification