Announcement and tone code generator for telephonic network and method
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United States of America Patent
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-
Dec 18, 1990
Grant Date -
N/A
app pub date -
May 3, 1989
filing date -
May 3, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
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).
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