Mobile CB transceiver
First Claim
1. A mobile citizens band transceiver comprising:
- a chassis adapted to be installed in a remote location in a motor vehicle such as under the dashboard or seat or in the trunk thereof, or the like, so as to reduce the possibility of theft or the likelihood that the chassis could cause injury to the occupants of the vehicle in the event of an accident or sudden stop;
frequency synthesizer means mounted on said chassis and including phase-locked loop circuit means responsive to give channel selection control signals for generating and precisely maintaining predetermined desired radio channel frequencies;
receiver circuitry means mounted on said chassis for receiving a plurality of radio frequency signals at said predetermined radio channel frequencies and for converting said radio frequency signals into audio frequency electrical signals;
transmitter circuitry means mounted on said chassis for converting input audio frequency electrical signals into radio frequency signals to be transmitted at any one of said plurality of predetermined desired radio channel frequencies;
serial-to-parallel register means responsive to a given serially-received multibit signal pattern for generating a corresponding given channel selection control signal for operating said frequency synthesizer means;
a separate control means of a size which may be selectively held and operated in a person'"'"'s hand, said separate control means being mounted in a position within easy reach of the person operating the motor vehicle, said separate control means including;
means for storing a plurality of multibit signal patterns representative of a plurality of said predetermined desired radio channel frequencies;
manually-operable channel-selection means for selecting any one of said plurality of predetermined radio channel frequencies;
means responsive to said manually-operable channel-selection means for addressing a selected one of said multibit signal patterns indicative of a corresponding one of said predetermined desired radio channel frequencies;
parallel-to-serial register means for receiving said addressed multibit signal pattern in parallel from said storage means and for outputting said selected multibit signal pattern sequence in a serial manner; and
connector means electrically coupling said separate control means to said remotely located chassis for serially transmitting said outputted multibit signal pattern sequence to said serial-to-parallel register means of said frequency synthesizer means thereby significantly reducing the size of the electrical cable and the number of connecting wires normally required for the parallel transfer of channel selection data between said control means and said frequency synthesizer means.
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Accused Products
Abstract
A mobile citizens band radio transceiver having the circuitry partitioned so as to permit the chassis housing the receiver circuitry, transmitter circuitry and frequency synthesizer circuitry to be installed in a remote location in a motor vehicle such as behind the dashboard, under the seat or in the trunk thereof, or the like, so as to reduce the possibility of theft and/or the likelihood that the chassis could cause injury to the occupants of the vehicle in the event of an accident or sudden stop by efficiently housing all of the control circuitry in a combination microphone and control unit adapted to be held in the hand of the operator of the vehicle and operated by the same hand which is holding the combination unit. By having all of the controls located in the microphone, a jack plug arrangement or the like can be utilized so that the microphone can be easily removed when the operator is not in the vehicle so that no sign of the presence of the CB radio will be visible to a potential thief. The partitioning of the circuitry between the controls in the microphone and the frequency synthesizer located on the remote chassis is enabled by the use of a memory in the control circuit for storing data words corresponding to the various CB radio frequency channels to be selected, manually-operable channel selection circuitry for addressing a given word in the memory and circuitry for serially transmitting the data word indicative of the selected channel to the remotely located frequency synthesizer thereby significantly reducing the size and number of electrical connections therebetween. The remotely located frequency synthesizer serially receives the stored control word and uses one or more portions thereof to preset counters in the frequency synthesizer circuitry so as to operate a phase-locked loop at precisely the given channel selected by the operator.
23 Citations
27 Claims
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1. A mobile citizens band transceiver comprising:
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a chassis adapted to be installed in a remote location in a motor vehicle such as under the dashboard or seat or in the trunk thereof, or the like, so as to reduce the possibility of theft or the likelihood that the chassis could cause injury to the occupants of the vehicle in the event of an accident or sudden stop; frequency synthesizer means mounted on said chassis and including phase-locked loop circuit means responsive to give channel selection control signals for generating and precisely maintaining predetermined desired radio channel frequencies; receiver circuitry means mounted on said chassis for receiving a plurality of radio frequency signals at said predetermined radio channel frequencies and for converting said radio frequency signals into audio frequency electrical signals; transmitter circuitry means mounted on said chassis for converting input audio frequency electrical signals into radio frequency signals to be transmitted at any one of said plurality of predetermined desired radio channel frequencies; serial-to-parallel register means responsive to a given serially-received multibit signal pattern for generating a corresponding given channel selection control signal for operating said frequency synthesizer means; a separate control means of a size which may be selectively held and operated in a person'"'"'s hand, said separate control means being mounted in a position within easy reach of the person operating the motor vehicle, said separate control means including; means for storing a plurality of multibit signal patterns representative of a plurality of said predetermined desired radio channel frequencies; manually-operable channel-selection means for selecting any one of said plurality of predetermined radio channel frequencies; means responsive to said manually-operable channel-selection means for addressing a selected one of said multibit signal patterns indicative of a corresponding one of said predetermined desired radio channel frequencies; parallel-to-serial register means for receiving said addressed multibit signal pattern in parallel from said storage means and for outputting said selected multibit signal pattern sequence in a serial manner; and connector means electrically coupling said separate control means to said remotely located chassis for serially transmitting said outputted multibit signal pattern sequence to said serial-to-parallel register means of said frequency synthesizer means thereby significantly reducing the size of the electrical cable and the number of connecting wires normally required for the parallel transfer of channel selection data between said control means and said frequency synthesizer means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A multichannel mobile CB radio system adapted to be operatively installed in a motor vehicle comprising a transceiver means adapted to be mounted in a remote location on the motor vehicle such as in the trunk, behind the dashboard, under the seat, or the like, and a hand-held combination microphone and control unit mounted for easy access to the operator of the CB radio system, said hand-held microphone and control unit including housing means of a size so as to be capable of being held in the vehicle operator'"'"'s hand, microphone means for converting audio sound signals into audio electrical signals for transmission purposes, and control means;
- said control means including (a) memory means for storing a plurality of multibit digital words each of which corresponds to a predetermined discrete radio channel frequency;
(b) channel selection means for selecting a predetermined one of said plurality of stored digital words; and
(c) means for serially transmitting the individual bits of said selected stored digital word to said remotely located transceiver means; and
said transceiver means including a radio transmitter means;
a radio receiver means; and
a frequency synthesizer means including a phase-locked loop circuit means for generating and maintaining said predetermined selected radio channel frequency, said phase-locked loop circuit means including (a) means for serially receiving and temporarily storing said selected digital word transmitted by said control means, (b) counter means responsive to one or more bits of said temporarily stored digital word for establishing an initial count number and being operable for controllably counting up or down therefrom, (c) means for generating a predetermined reference frequency, (d) phase comparator means having a first input coupled for receiving said generated predetermined reference frequency, a second input, and an output for generating a phase detection control signal, (e) a voltage-controlled oscillator responsive to said generated phase detection control signal for outputting a precisely controlled radio channel frequency signal to said radio transmitter means, and (f) means responsive to the output of said voltage-controlled oscillator for controlling the counting of said counter means from said initially stored number and for outputting a programmed channel frequency control signal to the second input of said phase comparator means for completing the phase-locked loop control circuit. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
- said control means including (a) memory means for storing a plurality of multibit digital words each of which corresponds to a predetermined discrete radio channel frequency;
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27. In the combination of a transducer and control unit adapted to be coupled by a multi-conductor cable to a separate radio transceiver chassis which is capable of transmitting and receiving a plurality of radio signals at preselected frequencies, said combination transducer and control unit comprising a housing of a size which is conveniently adapted to be held by one hand, a multiconductor cable secured to said housing and adapted to electrically connect said combination transducer and control unit to said radio transceiver chassis, a manually positionable transmit/receive switching means mounted in said housing and connected to said multi-conductor cable for selectively enabling said transceiver to transmit or receive said radio signals, volume control means mounted on said housing and coupled to said multi-conductor cable and said transducer for varying the amplitude of the audio frequency electrical signal produced by said transceiver, control circuit means, manually-operable channel-selecting means mounted on said housing and coupled to said control means for selecting the desired one of said plurality of preselected radio frequencies at which said transceiver is to function, and frequency synthesizer means responsive to said control means for generating said selected desired radio frequency signal, the improvement comprising the remote separation of said control means from said frequency synthesizer means such that said control means comprises digital circuit means housed within said transducer and control unit while said frequency synthesizer means is housed proximate said remotely located separate radio transceiver chassis, said control means including memory means for storing a plurality of words of control data, each of said words of data representing one of said predetermined channel frequencies, said control means further including means responsive to said manually-operable channel selection means for addressing the selected word of data stored in said memory and serially transmitting said word of data to said frequency synthesizer means, said frequency synthesizer means including means for serially receiving said transmitted word of data and means including a phase-locked loop control circuit responsive to said serially received word of control data for synthesizing said preselected desired radio channel frequency.
Specification