Acoustic detection of machinery malfunction

Details Acoustic detection of machinery malfunction Acoustic detection of machinery malfunction

2006-08-15

2006-08-15

Goins, Davetta W. (Department: 2632)

Communications: electrical

Audible indication

Electronic

C340S384500, C340S540000, C340S692000, C324S225000, C381S058000, C700S094000

Reexamination Certificate

active

07091832

ABSTRACT:
A sound variation indication apparatus includes a comparison element, an interval checker, and an indication generator. The comparison element receives an audio signal and compares it to a check value to provide a status signal indicating a presence and absence of an expected sound input. The interval checker detects the status signal at predetermined intervals, to provide an interval output. The indication generator generates an indication if the interval output is an absence representation. A process of generating an indication on absence of a sound input includes providing an audio signal based on a sound input and comparing the audio signal to a check value, providing a status signal indicating a presence and absence of the sound input. A status signal value is determined at predetermined intervals, to provide an interval output. An indication is generated if the interval output is an absence representation.

REFERENCES:
patent: 5164840 (1992-11-01), Kawamura et al.
patent: 5550925 (1996-08-01), Hori et al.
patent: 6718217 (2004-04-01), Shinohara et al.
patent: 6940986 (2005-09-01), Belenger et al.

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