Communications: electrical – Land vehicle alarms or indicators – Of burglary or unauthorized use
Patent
1976-03-16
1977-10-04
Pitts, Harold I.
Communications: electrical
Land vehicle alarms or indicators
Of burglary or unauthorized use
179 1P, 340261, G08B 2900
Patent
active
040527204
ABSTRACT:
A dynamic sound controller is designed to automatically adjust and shape the spectral distribution and amplitude of random masking noise before delivery via speakers to the environment of a room according to a preprogrammed timing sequence. In addition, the sound controller is capable of operating as a security and fire alarm system and is further capable of mixing a predetermined amount of background music and paging signals into the same set of speakers. The sound controller of the present invention is further adaptable to a variety of environmental detectors which adjust and shape the noise in response to such factors as temperature, humidity, light level, ionization level and background noise level. A method for shaping spectral distribution and for adjusting amplitude of masking noise in relation to the measured ambient and intrusion noise levels is disclosed.
REFERENCES:
patent: 3205316 (1965-09-01), Hechler
patent: 3304368 (1967-02-01), Ford
patent: 3410958 (1968-01-01), Cohen
patent: 3567863 (1971-03-01), Morrissey
patent: 3833897 (1974-09-01), Bell
patent: 3838408 (1974-09-01), McMaster
Chanaud Robert Charles
McGregor Howard Norman
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