Switching system having tone trunk

Details Switching system having tone trunk Switching system having tone trunk

1986-03-28

1987-07-14

Brown, Thomas W.

Multiplex communications

Wide area network

Packet switching

H04J 312

Patent

active

046807586

ABSTRACT:
A switching system having a tone trunk which stores, in the digital memory thereof, a predetermined digital tone signal in the form of digital codes for supplying the corresponding analog tone signal to telephone sets of subscribers. The digital codes have been coded in such a way that the analog tone signal is accompanied by a quantizing noise having a characteristic of white noise.

REFERENCES:
patent: 4171466 (1979-10-01), Carbrey
patent: 4570260 (1986-02-01), Basehore

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