Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1985-10-18
1987-03-31
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
73646, 307117, 340540, 340687, G08B 2100
Patent
active
046546421
ABSTRACT:
A tamperproof noise alarm for use in a school classroom to detect noise exceeding a predetermined intensity and duration and, in turn, warn both teacher and students when excessive noise has been detected. The noise alarm aids the instructor in preventing excessive classroom noise which can and does disrupt and destroy a given learning situation. A sensitivity control is provided to allow the instructor to determine the noise level at which the alarm will automatically respond. Alarm circuitry is not enabled until a first excessive noise occurs. A closely spaced second excessive noise causes an audible alarm to sound. When switched to a "delay" mode, the noise alarm is more tolerant of occassional classrool noise and will not sound a warning unless additional noise occurs subsequent to a timed delay of several seconds. The noise alarm also provides a digital readout, displaying how many times the audible alarm has been triggered, thus providing the instructor with a temporary record which can be used to reinforce acceptable classroom noise levels. Other controls are provided, allowing the instructor to reset the digital readout to zero, or to place the alarm in a "hold" mode, so that the alarm is temporarily disabled without disturbing any count which is displayed by the digital readout. Tamperproof circuitry within the noise alarm causes a two-tone alarm to sound repeatedly when a student attempts to tamper with any of the alarm's controls, including turning off its power switch or unplugging its power cord.
REFERENCES:
patent: 4307385 (1981-12-01), Evans et al.
patent: 4346374 (1982-08-01), Groff
patent: 4416155 (1983-11-01), Kirby
patent: 4481504 (1984-11-01), Scott, II
patent: 4529973 (1985-07-01), Blamberg
Mullen Jr. Thomas J.
Swann III Glen R.
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