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:
Aug. 02, 2005
Filed:
Jun. 15, 2001
Masato Horaguchi, Tokyo, JP;
Naoki Hongo, Tokyo, JP;
Takashi Uchida, Tokyo, JP;
Masaki Suto, Tokyo, JP;
Toshio Takada, Tokyo, JP;
Masato Horaguchi, Tokyo, JP;
Naoki Hongo, Tokyo, JP;
Takashi Uchida, Tokyo, JP;
Masaki Suto, Tokyo, JP;
Toshio Takada, Tokyo, JP;
Hitachi Kokusai Electric Inc., Tokyo, JP;
Abstract
To update the control value to a value of higher precision in a predistortion type distortion compensation apparatus for compensating the distortion occurring in an amplifier for amplifying an input signal by the control using a control value corresponding to the level of the input signal. Distortion generating means () generates distortion in an input signal, input signal level detecting means () detects the level of the input signal, distortion control means () controls the distortion generated by the distortion generating meansby using a control value corresponding to the level of the detected input signal, distortion component level detecting means () detects the level of distortion component contained in the amplified signal issued from the amplifier (), integrating means Kto KN integrate the level of the distortion component detected at every level of the detected input signal, and control value updating means () updates the control value corresponding to the level so that the integration result at every level of the input signal may be small.