Announcement and tone code generator for telephonic network and

Details Announcement and tone code generator for telephonic network and Announcement and tone code generator for telephonic network and

1989-05-03

1990-12-18

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

379 88, H04J 300, H04J 312

Patent

active

049791710

ABSTRACT:
An announcement and tone generator (10) for use with a telephonic network stores binarily encoded tone samples in a nonvolatile memory (22), such as a PROM or ROM, so that tones are immune to loss of memory due to power loss and, stores the binarily encoded announcements in a volatile memory, such as a DRAM, which is protected against memory loss by means of a back-up battery circuit. A microprocessor (20) provides successive samples of preselected binarily encoded tones or announcements for each of a plurality of time division multiplex channels which are coupled to the telephone network (12) through a digital interface (18).

REFERENCES:
patent: 4205203 (1980-05-01), Metha et al.
patent: 4558181 (1985-12-01), Blanchard et al.
patent: 4644476 (1987-02-01), Bergeron
patent: 4720848 (1988-01-01), Akiyama
patent: 4782510 (1988-11-01), Szlam

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