The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 30, 1987
Filed:
Oct. 22, 1985
Franciscus J Op de Beek, Eindhoven, NL;
Johannes W Kemna, Eindhoven, NL;
U.S. Philips Corporation, New York, NY (US);
Abstract
The noise-dependent volume control in accordance with the invention is capable of distinguishing between the real background noise and speech in a space (8). The gain (A) of the amplifier (1) is corrected only depending on the level of the background noise, so that once a difference in level between the background noise and a desired signal has been set this is maintained. The volume control is based on repeated measurements of the acoustic signal in the space (8). If it appears that in at least one frequency range the measured energy content (E.sub.i) has fallen at least N times within a range of values .DELTA.M around a value (M.sub.i) stored in a memory (26) the gain factor is adapted.