Communications – electrical: acoustic wave systems and devices – Selective – Humanly generated sound or speech responsive
Patent
1985-02-01
1987-06-02
Weldon, Ulysses
Communications, electrical: acoustic wave systems and devices
Selective
Humanly generated sound or speech responsive
34030915, 368 73, G10K 1100, G04B 2302
Patent
active
046708642
ABSTRACT:
An alarm device especially suitable for alarm clocks or timers is described, whose alarm signal can either be interrupted for a certain period of time or shut off by an acoustic signal, for example that formed by the human voice. As a result of its low power consumption, the alarm device according to the invention can also be used in battery-powered devices; when installed in an alarm clock or timer, inexpensive mass production is also made possible by using already existing integrated circuits. The alarm device according to the invention is functional even when the acoustic signal produced by the user is only of very short duration or when the alarm signal is delivered as a continuous tone. Advantageously, the alarm device can also be so designed that it delivers an alarm signal at least for a short time when someone is speaking when the alarm signal is triggered and other noises with frequencies outside the frequency range of fundamental tone of the human voice interrupt or shut off the alarm signal.
REFERENCES:
patent: 3582671 (1971-06-01), Ott
patent: 3725602 (1973-04-01), Hoffman
patent: 3784496 (1973-07-01), Hedin et al.
patent: 3855574 (1974-12-01), Welty
patent: 4408308 (1983-10-01), Smith et al.
patent: 4476554 (1984-10-01), Smith et al.
Roginsky, M. L. "Circuit Turns on Tape Recorder Only When Sound is Detected" Electronic Design, vol. 23, No. 20, (Sep. 27, 1975), p. 100.
Braun Aktiengesellschaft
Smith Ralph
Weldon Ulysses
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