Multi-band radio receiver

Claim 2

A multi-band radio receiver adapted to receive amplitude modulated radio frequency signals on a first waveband simultaneously with frequency modulated radio frequency signals on a second waveband which automatically selects audio signals for translation into an audio output from one of said wavebands in preference to audio signals from the other of said wavebands, said multi-band radio receiver including in combination: first receiver means for receiving said amplitude modulated radio frequency signals on said first waveband, second receiver means for receiving said frequency modulated radio frequency signals on said second waveband simultaneously with the receipt of said first radio frequency signals by said first receiver means, tuning means for tuning said first and second receiver means simultaneously to receive a particular one of said radio frequency signals on each of said wavebands, first detector means connected to said first receiver means for providing a first output voltage proportional in magnitude to the signal strength of a radio frequency signal received by said first receiver means, second detector means connected to said second receiver means for providing a second output voltage proportional in magnitude to the signal strength of a radio frequency signal received by said second receiver means, and comparator means connected to said first and second detector means for comparing the magnitudes of said output voltages including means for translating audio frequency signals from one of said receiver means into an audio output in accordance with said comparison, said comparator means including voltage magnitude adjustment means for altering the relative magnitudes of the output voltages from said detector means to select audio frequency signals of one of said receiver means for translation into an audio output in preference to audio frequency signals from the other of said receiver means.

Claim 3

A multi-band radio receiver as claimed in claim 1 wherein a first one of said detector means is connected to one of said first and second receiver means for providing a positive output voltage proportional to the strength of said radio frequency signals received by said receiver means and the second one of said detector means is connected to the other one of said first and second receiver means for providing a negative output voltage proportional to the signal strength of said radio frequency signals received by said receiver means, and wherein said comparator means includes summing means for adding the voltage ouTputs of said detector means and comparing the sum thereof to a reference voltage.

Claim 4

A multi-band radio receiver as claimed in claim 2 wherein said comparator means includes a bistable switch means operable to a first state upon receipt of an input signal positive with respect to said reference voltage and operable to a second state upon receipt of an input signal negative with respect to said reference voltage and a pair of audio output means connected to said bistable switch means and one of which is connected to said first receiver means for translating audio frequency signals therefrom into an audio output and the other of which is connected to said second receiver means for translating audio frequency signals therefrom into an audio output, said first one of said audio output means being operable in accordance with the operation of said bistable switch means to said first state and said other audio output means being operable in accordance with the operation of said bistable switch means to said second state.

Claim 5

A radio receiver adapted to receive amplitude modulated radio frequency signals on a first waveband simultaneously with frequency modulated radio frequency signals on a second waveband, which selects automatically for translation into an audio output, audio signals on one of said wavebands in preference to audio signals on the other of said wavebands, said radio receiver including in combination: first receiving means for receiving said amplitude modulated radio frequency signals on said first waveband, second receiving means for receiving said frequency modulated radio frequency signals on said second waveband simultaneously with the receipt of said first radio frequency signals, tuning means for tuning said first and second receiving means simultaneously to receive a particular one of said radio frequency signals on each of said wavebands, first detector means connected to one of said first and second receiving means for providing a positive polarity output voltage proportional to the strength of the radio frequency signals received by said one receiving means, second detector means connected to the other of said first and second receiving means for providing a negative polarity output voltage proportional to the strength of the radio frequency signals received by said other receiving means, voltage summing means coupled to the outputs of said first and second detectors for adding proportionally the voltage outputs therefrom, and bistable means coupled to said voltage summing means and to said first and second receiving means, said bistable means receiving an output voltage from said voltage summing means and being operable to first and second states in accordance with the magnitude of said output voltage to translate audio frequency signals from a corresponding receiving means into an audio output, said bistable means being operable to a first state upon receipt of a voltage output from said voltage summing means having at least a predetermined magnitude and to a second state upon receipt of a voltage output from said voltage summing means of a magnitude less than said predetermined magnitude, said voltage summing means further including adjustable voltage dividing means connected to the outputs of said detector means and to said bistable means for adjusting the ratio of the voltage outputs of said detector means comprising the voltage output of said voltage summing means, thereby to alter the signal strength requirement of radio frequency signals on a preferred waveband for translation of corresponding audio frequency signals therefrom into an audio output.

Claim 6

A radio receiver adapted to receive amplitude modulated radio frequency signals on a first waveband simultaneously with frequency modulated radio frequency signals on a second waveband, which selects automatically for translation into an audio output, audio signals on one of said wavebands in preference to audio signals on the other of said wavebands, said radio receiver including in combination: first receiving means for receiving said amplitude modulated radio frequency signals on said first waveband, second receiving means for receiving said frequency modulated radio frequency signals on said second waveband simultaneously with the receipt of said first radio frequency signals, tuning means for tuning said first and second receiving means simultaneously to receive a particular one of said radio frequency signals on each of said wavebands, first detector means connected to one of said first and second receiving means for providing a positive polarity output voltage proportional to the strength of the radio frequency signals received by said one receiving means, second detector means connected to the other of said first and second receiving means for providing a negative polarity output voltage proportional to the strength of the radio frequency signals received by said other receiving means, voltage summing means coupled to the outputs of said first and second detectors for adding proportionally the voltage outputs therefrom, and bistable means coupled to said voltage summing means and to said first and second receiving means, said bistable means receiving an output voltage from said voltage summing means and being operable to first and second states in accordance with the magnitude of said output voltage to translate audio frequency signals from a corresponding receiving means into an audio output, said bistable means being operable to a first state upon receipt of a voltage output from said voltage summing means having at least a predetermined magnitude and to a second state upon receipt of a voltage output from said voltage summing means of a magnitude less than said predetermined magnitude, said voltage summing means further including adjustable voltage dividing means connected to the outputs of said detector means and to said bistable means for adjusting the ratio of the voltage outputs of said detector means comprising the voltage output of said voltage summing means, thereby to alter the signal strength requirement of radio frequency signals on a preferred waveband for translation of corresponding audio frequency signals therefrom into an audio output.

Claim 7

A multi-band radio receiver adapted to receive amplitude modulated radio frequency signals on a first waveband simultaneously with frequency modulated signals on a second waveband which automatically selects for translation into an audio output, audio signals from one waveband in preference to audio signals from the other waveband, said radio receiver including in combination: first receiving means For receiving amplitude modulated radio signals on said first waveband, second receiving means for receiving frequency modulated radio signals on said second waveband simultaneously with the receipt of said first radio signals, tuning means for tuning said first and second receiving means simultaneously to receive a particular radio frequency signal on each of said wavebands, first detector means connected to one of said first and said second receiving means for providing a positive polarity output voltage proportional to the signal strength of a radio frequency signal received by said one receiving means, second detector means connected to the other of said first and second receiving means for providing a negative polarity output voltage proportional to the signal strength of a radio frequency signal received by said other receiving means, comparator means coupled to said first and second detector means for receipt of said output voltages therefrom, said comparator means providing a voltage of a resultant polarity in accordance with the receipt of said voltages from said first and second detector means, bistable means coupled to said comparator means for sensing said resultant voltage and in accordance with the polarity thereof being operated to a first or second stable state, and first and second signal translation means coupled to said bistable means, said first signal translation means operated to translate audio signals of said first receiver means into an audio output upon said bistable means being operated to said first stable state and the second signal translating means being operated to translate audio signals of said second receiving means upon said bistable means being operated to said second stable state, said comparator means further including voltage adjustment means for altering the relation of said output voltages from said first and second detector means to select audio signals from one of said receiving means for translation by one of said first and second signal translation means in preference to audio signals from the other of said receiving means.

Claim 8

A multi-band radio receiver adapted to receive amplitude modulated radio frequency signals on a first waveband simultaneously with frequency modulated signals on a second waveband which automatically selects for translation into an audio output, audio signals from one waveband in preference to audio signals from the other waveband, said radio receiver including in combination: first receiving means For receiving amplitude modulated radio signals on said first waveband, second receiving means for receiving frequency modulated radio signals on said second waveband simultaneously with the receipt of said first radio signals, tuning means for tuning said first and second receiving means simultaneously to receive a particular radio frequency signal on each of said wavebands, first detector means connected to one of said first and said second receiving means for providing a positive polarity output voltage proportional to the signal strength of a radio frequency signal received by said one receiving means, second detector means connected to the other of said first and second receiving means for providing a negative polarity output voltage proportional to the signal strength of a radio frequency signal received by said other receiving means, comparator means coupled to said first and second detector means for receipt of said output voltages therefrom, said comparator means providing a voltage of a resultant polarity in accordance with the receipt of said voltages from said first and second detector means, bistable means coupled to said comparator means for sensing said resultant voltage and in accordance with the polarity thereof being operated to a first or second stable state, and first and second signal translation means coupled to said bistable means, said first signal translation means operated to translate audio signals of said first receiver means into an audio output upon said bistable means being operated to said first stable state and the second signal translating means being operated to translate audio signals of said second receiving means upon said bistable means being operated to said second stable state, said comparator means further including voltage adjustment means for altering the relation of said output voltages from said first and second detector means to select audio signals from one of said receiving means for translation by one of said first and second signal translation means in preference to audio signals from the other of said receiving means.

Claim 9

A multi-band radio receiver as claimed in claim 5 wherein said comparator means includes voltage summing means for summing the voltages derived from said first and second detector means to provide said resultant voltage.

Claim 10

A multi-band radio receiver as claimed in claim 6 wherein said voltage summing means includes a variable resistor adjustable to alter the ratio of the voltages from said detector means used to produce said resultant voltage sensed by said bistable means, so as to change the required signal strength of the radio signals received at a preferred one of said first and second receiving means for translation of corresponding audio signals therefrom into an audio output.

Claim 11

A multi-band radio receiver as claimed in claim 5 wherein each said receiving means includes an IF signal producing means for producing signals having a magnitude proportional to the strength of said radio signals and wherein a corresponding detector means is connected for receipt of said IF signals, and wherein the magnitude of each of the output voltages of said detector means is proportional to the strength of the IF signals received thereby.

Claim 12

A multi-band radio receiver as claimed in claim 8 wherein said first and second signal translation means each include a transistor coupled between a corresponding receiving means for passing audio signals derived in said receiving means from radio frequency signals received thereby, to said audio output, the emitter electrodes of both said transistors being connected to the audio output of said receiver, and wherein said bistable means includes means for providing a voltage of a predetermined value at said emitter electrodes regardless of the state of operation thereof, and for providing a voltage of a second predetermined value at the base electrode of said first transistor upon being operated to a first stable state so as to bias said transistor to a state of conductiOn, thereby to pass audio signals from said first receiving means to said audio output and for providing a voltage of said second predetermined value at the base electrode of said second transistor to bias said transistor to a state of conduction upon being operated to said second stable state, thereby to pass audio signals from said second receiving means to said receiver output.