Wireless telephone system with high level dial pulse signalling
First Claim
1. A wireless extension telephone system comprising:
- a remote unit including a radio transmitter, a signal generator operated to produce tone signals of a predetermined frequency, a modulator connected between said generator and said transmitter, operated to modulate said transmitter, said transmitter operated to transmit radio signals modulated at the frequency of said tone signals, amplitude control means connected to said modulator, limiting said modulated radio signals to a first amplitude, a dialing circuit connected to said amplitude control means, operated to generate a selected quantity of dial pulses and on response to each dial pulse, said amplitude control means operated to limit said modulated radio signals to a second amplitude; and
a base unit connected to a telephone line including, a radio receiver and dial pulse detection means connected between said receiver and said telephone line operated in response to receipt by said receiver of signals of said second amplitude to pulse said telephone line.
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Accused Products
Abstract
A wireless extension telephone system including a base unit connected to a telephone line and a remote extension unit. Both base and remote units each include a radio receiver and a radio transmitter. Also included in the remote unit is a modulator connected to the radio transmitter and circuitry limiting the amplitude of modulated signals produced by said transmitter. A dialing circuit connected to the modulator causes the amplitude of each outgoing signal representing a dial pulse to be transmitted at a level substantially higher than when no dial pulses are present. At the base unit a dial pulse detection circuit differentiates between the modulated signals received by the associated radio receiver, providing connections to the telephone line in response to signals of a first amplitude and breaking the line in response to each received pulse of a higher level amplitude.
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Citations
12 Claims
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1. A wireless extension telephone system comprising:
- a remote unit including a radio transmitter, a signal generator operated to produce tone signals of a predetermined frequency, a modulator connected between said generator and said transmitter, operated to modulate said transmitter, said transmitter operated to transmit radio signals modulated at the frequency of said tone signals, amplitude control means connected to said modulator, limiting said modulated radio signals to a first amplitude, a dialing circuit connected to said amplitude control means, operated to generate a selected quantity of dial pulses and on response to each dial pulse, said amplitude control means operated to limit said modulated radio signals to a second amplitude; and
a base unit connected to a telephone line including, a radio receiver and dial pulse detection means connected between said receiver and said telephone line operated in response to receipt by said receiver of signals of said second amplitude to pulse said telephone line. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
- a remote unit including a radio transmitter, a signal generator operated to produce tone signals of a predetermined frequency, a modulator connected between said generator and said transmitter, operated to modulate said transmitter, said transmitter operated to transmit radio signals modulated at the frequency of said tone signals, amplitude control means connected to said modulator, limiting said modulated radio signals to a first amplitude, a dialing circuit connected to said amplitude control means, operated to generate a selected quantity of dial pulses and on response to each dial pulse, said amplitude control means operated to limit said modulated radio signals to a second amplitude; and
Specification