Sound masking package

Details Sound masking package Sound masking package

1978-08-11

1980-01-22

Morrison, Malcolm A.

179 1E, 179 15M, H04R 300

Patent

active

041851676

ABSTRACT:
A self-contained sound masking package including a housing having an interior forming a loudspeaker enclosure in the bottom of which is disposed an electric circuit arranged to be connected to an associated source of electrical power for producing a voltage having a predetermined frequency range within the audible spectrum and with the frequencies at predetermined relative decibel levels, the voltage being applied to a transducer such as a loudspeaker having a coil supported in the housing interior adjacent the top of the housing for introducing an audible sound of the predetermined frequency range and decibel levels into the area surrounding the housing, together with means for connecting a remote signal source to the circuit to provide a supplementary audible output from the loudspeaker into the area and the electric circuit being preferably in the form of a printed circuit board and having filter means which may be selectively activated to provide an audible output from the loudspeaker throughout at least two separate frequency ranges and decibel levels.

REFERENCES:
patent: 2983790 (1961-05-01), Olson
patent: 2986140 (1961-05-01), Gardner et al.
patent: 3057960 (1962-10-01), Kaiser
patent: 3101391 (1963-08-01), Tomatis
patent: 3126450 (1964-03-01), Neil et al.
patent: 3213851 (1965-10-01), Currea
patent: 3229429 (1966-01-01), Conrad
patent: 3272198 (1966-09-01), Balkin
patent: 3392240 (1968-07-01), Parkin
patent: 3541452 (1970-11-01), DiSesa et al.
patent: 3567863 (1971-03-01), Morrissey
patent: 3826870 (1970-03-01), Wurm et al.
patent: 3911221 (1975-10-01), Wong

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