Telephone voice frequency response system for message recording

Details Telephone voice frequency response system for message recording Telephone voice frequency response system for message recording

1977-08-10

1978-10-24

Konick, Bernard

179 6D, 179 6C, 179 2A, H04M 164

Patent

active

041223071

ABSTRACT:
A voice frequency response system consisting of a central voice frequency response device and a thermal unit, the central voice frequency response device including means for confirming a specific code allotted to the thermal unit, a PB signal receiver, a message drum and a trunk, and the terminal unit including a recorder recording message information transmitted from the central voice frequency response device, a PB signal oscillator, and a push button dial generating the specific code applied to the central voice frequency response device. In the system, a signal consisting of the combination of three frequencies in the voice frequency band is recorded on a portion of the message drum to be selectively applied to the terminal unit prior to transmission of important message information. The terminal unit includes a filter which detects this three-frequency signal so that the recorder is actuated by the output signal of the filter. In the terminal unit, a signal is generated in response to the normal operation of the recorder for actuating the PB signal oscillator. This PB signal is received by the PB signal receiver in the central voice frequency response device, and the central voice frequency response device detects that the recorder in the terminal unit has started its recording operation, and transmits the important message information to the terminal unit.

REFERENCES:
patent: 3376390 (1968-04-01), Hashimoto
patent: 3651267 (1972-03-01), Wittenberger

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