Life safety audio system having a voice synthesizer and a constant volume telephone network
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United States of America Patent
Stats
-
Jul 21, 1987
Grant Date -
N/A
app pub date -
May 16, 1985
filing date -
May 16, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A life safety system for monitoring a building has a plurality of detectors for detecting alarm conditions located throughout the building, a plurality of speakers located throughout the building, a source of pre-stored voice messages which can be broadcast over the speakers, and a telephone network. The improvement is a voice synthesizer for providing the source of pre-stored voice messages and a constant volume telephone system. The constant volume telephone system has a telephone line and a plurality of telephones which can be connected to the telephone line, and a power supply having an adjustable output voltage which provides the voltage for the telephone line. A sensing and adjusting circuit senses the number of telephones off-hook and causes the power supply to be adjusted in response to the number of telephones off-hook.
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