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:
Apr. 01, 1997
Filed:
Dec. 27, 1994
Toshio Yoshida, Tokyo, JP;
Michitaka Sisido, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
A telephone set comprises a noise detector, a noise level determining circuit, and a noise canceler. The noise detector detects a noise component from a transmitting acoustic signal by detecting signal recurrence of the transmitting acoustic signal. The noise level determining circuit determines a noise level by comparing the noise component with a first threshold. According to the noise level, the noise canoelet cancels the noise component from the transmitting acoustic signal when the noise level is not smaller than the first threshold. The telephone set further comprises a frequency characteristics controller for a received acoustic signal to obtain a desired speech articulation. The frequency characteristics controller, based on the noise level, determines a level change region, a level change value, and a level change direction of the spectrum of the received acoustic signal.