Keypad/dialler interface for telephone test set

Details Keypad/dialler interface for telephone test set Keypad/dialler interface for telephone test set

1988-08-03

1989-09-19

Schreyer, Stafford D.

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Using portable test set

379350, 379360, H04M 124

Patent

active

048688584

ABSTRACT:
The functionality of the keypad of a telephone test set is augmented by an interface circuit arrangement which enables keys of the keypad to be used to control both dialing signal generation and prescribed test functions, while effectively preventing interference between the operation of a dialing signal generator, to which the keypad is coupled during a first mode of operation, and that of test function signal generator circuitry, provided exclusive of the dialing signal generator, during a second mode of operation. Additionally, the test set includes a ringing signal coupling circuit for enabling the test set microphone, through which a telephone craftsperson voices audio speech signals to a speech signal processing circuit, to be used to audiblize the ringing signal, without impacting the normal voice input functionality of the microphone and associated speech signal processor.

REFERENCES:
patent: 4194098 (1980-03-01), Carlson

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