Method and apparatus for monitoring sound-conducting media

Details Method and apparatus for monitoring sound-conducting media Method and apparatus for monitoring sound-conducting media

1978-04-27

1980-09-30

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

Specific condition

340550, 367 93, G08B 1322

Patent

active

042258596

ABSTRACT:
A method of, and apparatus for, monitoring sound-conducting media wherein sound vibrations are transmitted to and absorbed by the sound-conducting medium. The frequency of the transmitted sound vibrations periodically pass through a predetermined frequency range. During an evaluation period the course of any one of the amplitude or phase of the received sound vibrations are compared with the course of the amplitude or phase during one of the preceding evaluation periods, and when there occur predetermined deviations of both amplitude courses or both phase courses from one another there is triggered an alarm signal.

REFERENCES:
patent: 3431551 (1969-03-01), Rollwitz et al.
patent: 3603919 (1971-09-01), Moore
patent: 3614719 (1971-10-01), Treacy
patent: 3794964 (1974-02-01), Katakura
patent: 3946377 (1976-03-01), Zetting
patent: 3967283 (1976-06-01), Clark et al.
patent: 4023156 (1977-05-01), Galvin
patent: 4034331 (1977-07-01), Menin et al.
patent: 4054867 (1977-10-01), Owens
patent: 4088989 (1978-05-01), Solomon
patent: 4112420 (1978-09-01), Mifune et al.

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