Invisible acoustic screen for open-plan offices and the like

Details Invisible acoustic screen for open-plan offices and the like Invisible acoustic screen for open-plan offices and the like

1996-07-17

1999-03-30

Kuntz, Curtis A.

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Counterwave generation control path

381 711, 381 947, 36472419, H03B 2900, A61F 1106

Patent

active

058898697

ABSTRACT:
The invisible acoustic screen for reducing sound leakage from handsfree telephones, loudspeaking computer terminals, and the like in a workspace includes a sound reducing apparatus comprising: a sound producing loudspeaker; a cancelling loudspeaker; a sensing microphone having an output; a delay circuit; and, an adaptive filter circuit having a value determined by a transfer function between the sound producing loudspeaker and the sensing microphone and by a transfer function between the cancelling loudspeaker and the sensing microphone; and the output of the sensing microphone being fed back to the adaptive filter circuit; and the received signal coupled through a delay circuit to the sound producing loudspeaker.

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