Sound surge detector for alerting headphone users

Details Sound surge detector for alerting headphone users Sound surge detector for alerting headphone users

1988-03-15

1989-05-02

Tarcza, Thomas H.

Communications, electrical: acoustic wave systems and devices

Receiver circuitry

Responsive to intruder energy

381 57, 340566, H04R 300

Patent

active

048274585

ABSTRACT:
A sound reproducing system including a portable appliance reproducing sound from a recording and a transmission path transmitting reproduced sound to headphones worn by a user, and an apparatus for indicating to the user the occurrence of an abnormal event, causing a surge of ambient sound. The apparatus and a related method pick up ambient sound, transduce the ambient sound to an electrical signal, amplify the electrical signal, provide as a first output signal an envelope of the amplified signal, differentiate the first output signal, produce a second output signal with an amplitude which is a function of the slope of the first output signal, comparing the amplitude of the second output signal to a preset threshold level, and produce a control signal when the second output signal exceeds the threshold level indicating the occurrence of a surge in ambient sound having an amplitude, duration, and rising leading edge exceeding certain minimum characteristics, and indicating to the user the occurrence of an abnormal event through the transmission path.

REFERENCES:
patent: 3068319 (1962-12-01), Fletcher et al.
patent: 3158835 (1964-11-01), Hipkins
patent: 3271520 (1966-09-01), Fletcher et al.
patent: 4088836 (1978-05-01), Tech
patent: 4250499 (1981-02-01), Kienzle
patent: 4475230 (1984-10-01), Fukuyama et al.
patent: 4531229 (1985-07-01), Coulter
patent: 4712093 (1987-12-01), Reichel

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