Telephone exchange apparatus and tone sending method in telephon

Details Telephone exchange apparatus and tone sending method in telephon Telephone exchange apparatus and tone sending method in telephon

1992-11-10

1996-06-25

Hofsass, Jeffery

Telephonic communications

Centralized switching system

With generating of call associated substation signal

379283, 379418, 379231, H04M 306

Patent

active

055307434

ABSTRACT:
In a telephone exchange apparatus for performing exchange processing by a memory time switch, first tone signals are generated, and second tone signals are generated by sequentially exchange-controlling the memory time switch in synchronism with the zero-crossing points of the generated first tone signals. Furthermore, when the second tone signals are sent to corresponding output time slots, the switching operation is performed in synchronism with the zero-crossing points of the second tone signals, so that high-quality tones including no harmonic component can be sent to an extension telephone set or to another system through an outside line.

REFERENCES:
patent: 5185738 (1993-02-01), Kelly
patent: 5249220 (1993-09-01), Moskowitz et al.

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