System of connecting a wire telecommunication and a radio communication

• US 4,213,009 A
• Filed: 11/03/1978
• Issued: 07/15/1980
• Est. Priority Date: 11/03/1978
• Status: Expired due to Term

• Current Assignee: Whyte & Hirschboeck S C
• Original Assignee: Whyte & Hirschboeck S C
• Inventors: Suzuki, Koro
• Primary Examiner(s): Brigance, Gerald
• Application Number:
  US05/957,435
• Time in Patent Office: 620 Days
• Field of Search: 179/2 EA, 179/2 EB, 325/27, 325/47, 325/54, 325/55, 325/64, 325/65
• US Class Current: 455/462
• CPC Class Codes: H04M 1/72505 Radio link set-up procedures

Abstract

A portable telephone assembly has a portable assembly and a base assembly each provided with a radio transmitter and receiver. The portable unit is operative to generate first and second frequency signals one of which is interruptable upon dialing. The base unit includes frequency responsive means operable to connect the base unit to a telephone line when both signals have been received and for interrupting and reestablishing the connection during dialing.

Claims

1. A cordless telephone assembly including a portable assembly and coupling assembly for coupling the portable assembly to a telephone line, said portable and coupling assemblies each having a radio transmitter and a radio receiver for communicating with each other, said portable assembly being constructed and arranged to transmit a carrier wave and first and second modulating frequency signals applied to said carrier wave,

means for intermittently interrupting said second modulating frequency signal in accordance with a signal interrupting sequence, said coupling assembly comprising:

first circuit means including line seizure means operative to connect said coupling assembly to said telephone line and gating circuit means connected to said line seizure means,

second circuit means comprising first tone selective means operable in response to said first modulating frequency signal from said portable assembly for producing a first output signal,

third circuit means comprising second tone selective means operable in response to said second modulating frequency signal from said portable assembly for producing a second output signal,

said gating circuit means being connected to said second and third circuit means for receiving said first and second output signals and being operable in response thereto to actuate said line seizure means for connecting said coupling assembly to said telephone line whereby said coupling assembly operates to couple said portable assembly to said telephone line when said first and second modulating frequency signals are received by the radio receiver of said coupling assembly so that said coupling means will not be connected to said telephone line when an extraneous signal is received having either of said first or second frequency signals,

said third circuit means being responsive to the interruptions of said second frequency signal by interrupting and reestablishing its output signal for disabling and enabling said first means in correspondence to said signal interrupting sequence and fourth circuit means coupled to said gating means for maintaining said gating means in an enabled condition when said first output signal disappears, reset means for resetting said fourth circuit means to disable said fourth circuit means when said second signal disappears, and delay means for delaying the operation of said reset means when said second signal is interrupted during a signal interrupting sequence.

2. The assembly set forth in claim 1 wherein the portable assembly includes first and second tone generators for generating said first and second modulating frequency signals, each of said tone generators including a tuning fork reed for generating said modulating signals within a narrow band.

3. The assembly set forth in claim 1 wherein said gating means includes first and second gate means wherein said line seizure means is operative to connect said coupling assembly to said telephone line when each of said gate means is in a predetermined state, said first and second gate means being respectively connected to said second and third circuit means for respectively receiving the first and second output signals therefrom, said gate means each being placed in its predetermined state upon receipt of said signals.

4. The assembly of claim 3 and including fourth circuit means coupled to said third circuit means and responsive to the output signal thereof for maintaining said first gate means in its respective predetermined state when said first output signal disappears, and fifth circuit means coupled to said third and fourth circuit means for delaying the disablement of said first gate means when said second signal disappears during a signal interrupting sequence.

5. The assembly set forth in claim 4 and including reset means for returning said first gate means to an alternate state when said second output signal disappears, and time delay means for delaying the operation of said reset means for a time longer than the time between signal interrupting pulses.