Acoustics – Anatomic or prosthetic relation – Ear and mouth
Patent
1975-09-19
1977-10-04
Birmiel, Howard A.
Acoustics
Anatomic or prosthetic relation
Ear and mouth
181153, 181199, 179 1AA, 179 1E, 312 7R, H04K 100
Patent
active
040525643
ABSTRACT:
Masking sound generating apparatus for use in a conventional room enclosure occupied by adult persons of average range of heights comprising a hollow enclosure having a top opening and a side opening, a speaker mounted inside the enclosure intermediate the top opening and the side opening and facing outwardly from the apparatus through the top opening, and a circuit in the enclosure operable to develop an electric signal which is converted to an audible sound signal emitted by the speaker. Modulation means are incorporated into the circuit to cyclically vary the amplitude of the sound signal which provides the masking sound signal with a pleasant, natural sound characteristic. The sound generating apparatus is located in the room at a height intermediate the head of a standing adult person and the ceiling, and is positioned so that the speaker faces in an upwardly direction to direct sound signals toward the ceiling. Other sound signals produced by the speaker eminate from the side opening to provide the masking sound with a slight undertone characteristic.
REFERENCES:
patent: D196679 (1963-10-01), Schaffer
patent: 3026955 (1962-03-01), Wilber
patent: 3213199 (1965-10-01), Snow
patent: 3371742 (1968-03-01), Norton et al.
patent: 3476880 (1969-11-01), Flanagan
patent: 3486578 (1969-12-01), Abarino
patent: 3497623 (1970-02-01), Todd
patent: 3541258 (1970-11-01), Doyle et al.
patent: 3879578 (1975-04-01), Wildi
Review of Harman-Kardon Citation 13 Speaker System, Audio, May 1972, pp. 69-71.
Propst Robert L.
Wodka Michael A.
Birmiel Howard A.
Herman Miller Inc.
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