Remote telephone system

• US 4,291,197 A
• Filed: 05/31/1979
• Issued: 09/22/1981
• Est. Priority Date: 05/31/1978
• Status: Expired due to Term

• Current Assignee: Abbott Laboratories Incorporated
• Original Assignee: Maruyoshi Sangyo KK
• Inventors: Yonaga, Yoshifumi
• Primary Examiner(s): Brigance, Gerald L.
• Application Number:
  US06/044,069
• Time in Patent Office: 845 Days
• Field of Search: 179/2 E, 179/2 EA, 179/2 EB, 179/18 DA, 325/37, 325/55, 325/64
• US Class Current: 455/411
• CPC Class Codes: H04M 1/72505 Radio link set-up procedures

Abstract

This invention relates to a cordless telephone system which includes a radiophone having a radio transmitter and a radio receiver, and a radio station wired to a communication line having a ratio transmitter and a radio receiver.

The radiophone is provided with a means which develops a pulse signal. The means may be a dial thereof, where the pulse signals is to be a dialing signal.

The pulse signal is emitted to the radiophone on a carrier wave.

The radiophone is provided with a means which detects and responds the pulse signal, and also a means which enables or disables a dialing signal demodulator therein as a function of the response of the means.

Claims

1. A remote telephone system comprising a remote station having a remote transmitter and receiver means, and a base station having a base transmitter and receiver means, wherein said remote station includes pulse code means for generating a pulse signal corresponding to at least one predetermined decimal number, said remote transmitter means transmitting said pulse signal to said base radio station, and said base receiver means receiving said transmitted pulse signal, and wherein said base radio station includes discriminator means, coupled to said base receiver means, for determining if said pulse signal corresponds to said at least one predetermined decimal number, a dialing signal demodulator means, and enabling means, responsive to said discriminator means, for enabling said dialing signal demodulator if said transmitted pulse signal corresponds to said at least one predetermined decimal number, and wherein said base station includes counter means for counting the pulses in said pulse signal and for providing an output corresponding to the number of pulses counted;

and gate means having one input coupled to the output of said counter means corresponding to said at least one predetermined decimal number and another input coupled to said dial signal demodulator means, whereinsaid base station includes means for disabling said counter means after its response to said pulse signal corresponding to said predetermined decimal number, and means for resetting said counter means in response to a carrier signal from said remote station and wherein the output of said gate means is coupled to a dialing relay means for controlling the opening and closing thereof.

2. A remote telephone system as set forth in claim 1 wherein said at least one predetermined decimal number is at least two decimal numbers and wherein said base radio station counter means includes at least two counters each of said counter means counting the pulses in said pulse signal corresponding to one of said decimal numbers and providing an output corresponding to the number of pulses counted;

and said gate means is coupled to all of said counters for producing an output when the outputs of said counters means correspond to said predetermined decimal numbers.

3. A remote telephone system as set forth in claim 2 wherein said base radio station disabling means includes means for disabling all of said counters after their response to said pulse signal corresponding to said predetermined pulse numbers, and said resetting means includes means for resetting all of said counters in response to said carrier signal from said remote station.

4. A remote telephone system comprising a remote station and a base station connected to a telephone line, said remote station comprising a dial means, first transmitter means, first receiver means, first pulse generator means for generating first pulses having a long pulse width, second pulse generator means for generating second pulses having a short pulse width wherein said first pulses represent one of a logic 1 or 0 and said second pulses represent the other of said logic 1 or 0, and encoder means for combining the outputs of said first and second pulse generator means in a predetermined sequence to produce a binary coded decimal signal corresponding to a predetermined decimal number wherein the output of said encoder means is transmitted to said base station by said first transmitter means;

and said base station comprises a second transmitter means, a second receiver means, detector means for detecting said binary coded decimal signal, a dialing signal demodulator means, and enabling means coupled to said detector means for enabling said dialing signal demodulator means in response to the detection of said binary coded decimal signal by said detector means.

5. A remote telephone system as set forth in claim 4 wherein said encoder means includes means for sampling said first and second pulses and providing a series of pulses corresponding to said predetermined decimal number;

and wherein said detector means includes means for converting said encoded serial pulses into encoded parallel pulses, and decoder means for decoding said parallel pulses and wherein said enabling means includes gate means having an input coupled to said decoder means.

6. A remote telephone system as set forth in claim 4 wherein said encoder means includes counter means having parallel outputs for counting said first pulses, switch array means for selectively sampling one of said first or second pulses and providing a code of parallel pulses corresponding to said predetermined decimal number, and AND gate means coupled to said counter means and said switch array means for receiving the outputs thereof and providing a series of pulses corresponding to said predetermined decimal number;

and wherein said detector means includes means for converting said series of pulses into parallel encoded pulses and decoder means for decoding said parallel encoded pulses and wherein said enabling means includes gate means.

7. A remote telephone system as set forth in claim 6 wherein said remote station includes hook switch means for resetting said counter means and initiating operation of said first pulse generator means.

8. A remote telephone system as set forth in claim 4 wherein said encoder means includes means for selectively sampling one of said first or second pulses and providing a code of serial pulses corresponding to said predetermined decimal number;

and wherein said detector means comprises counter means having a plurality of output terminals for counting said serial pulses, delay means for receiving said serial pulses and eliminating said second pulses therefrom, AND gate means having the inputs thereof coupled to said counter means and said delay means, and binary to decimal converter means coupled to said AND gate means for converting the output thereof to a decimal signal, and wherein said enabling means includes gate means for receiving said decimal signal.