Independent wideband RF transmission detector for cellular telephone
First Claim
1. A device for controlling an accessory based on the detection of carrier frequency transmissions of appropriate input frequency exceeding a minimum threshold amplitude from a nearby cellular telephone, comprising:
- (a) an independent receiver for directly detecting the transmissions from the nearby cellular telephone, said receiver including a wideband front end; and
,(b) a controller connected to said receiver for controlling the accessory device based on said detection of the transmission from the nearby cellular phone, wherein said frequency discriminator serves to determine whether the input frequency is greater than a certain pre-determined threshold frequency and amplitude;
said frequency discriminator comprises a clock oscillator, a counter for counting incoming pulses from the received carrier frequency, an accumulator for determining whether the number of counter pulses exceeds a minimum number, M, a transfer flip-flop connected to the output of the accumulator, a memory element for storing the accumulator output and a clock delay element connected between the clock oscillator and transfer flip-flop for transferring the accumulator output to the memory element.
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Accused Products
Abstract
A device for controlling an accessory based on the detection of transmissions of appropriate input frequency exceeding a minimum threshold amplitude from a nearby cellular telephone. The device includes an independent receiver for directly detecting the transmissions from the nearby cellular telephone and a controller connected to the receiver for controlling the accessory device based on the detection of the transmission from the nearby cellular phone. The independent receiver includes a frequency discriminator of a totally digital design for detecting a signal which is greater than a predetermined threshold frequency and amplitude.
96 Citations
20 Claims
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1. A device for controlling an accessory based on the detection of carrier frequency transmissions of appropriate input frequency exceeding a minimum threshold amplitude from a nearby cellular telephone, comprising:
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(a) an independent receiver for directly detecting the transmissions from the nearby cellular telephone, said receiver including a wideband front end; and
,(b) a controller connected to said receiver for controlling the accessory device based on said detection of the transmission from the nearby cellular phone, wherein said frequency discriminator serves to determine whether the input frequency is greater than a certain pre-determined threshold frequency and amplitude;
said frequency discriminator comprises a clock oscillator, a counter for counting incoming pulses from the received carrier frequency, an accumulator for determining whether the number of counter pulses exceeds a minimum number, M, a transfer flip-flop connected to the output of the accumulator, a memory element for storing the accumulator output and a clock delay element connected between the clock oscillator and transfer flip-flop for transferring the accumulator output to the memory element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification