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:
Jan. 22, 2002
Filed:
Aug. 28, 1998
Takashi Kohashi, Tokyo, JP;
Akira Ogino, Tokyo, JP;
Hisayoshi Moriwaki, Tokyo, JP;
Yuji Kimura, Kanagawa, JP;
Nozomu Ikeda, Tokyo, JP;
Sony Corporation, Tokyo, JP;
Abstract
A method and apparatus for detecting spectrum spread signals by reducing the correlation between the main information signal and the spread signal as much as possible, whereby the detection of a spectrum spread signal is made easier. From an input signal, in which a spectrum spread signal obtained by spectrum spreading an additional information signal has been superimposed on a main information signal, the spectrum spread signal is detected. Using a level adjusting circuit, the gain of the input signal, mainly the main information signal is controlled to reduce the change in the main information signal, or the input signal is sliced at a predetermined level by a slicing circuit to fetch a signal at a predetermined level or lower. A spectrum spread signal detecting unit performs an inverse spectrum spread on an input signal in which the change in the main information signal is reduced, or an input signal with the major portion of the main information signal removed to thereby detect the additional information spectrum spread signal.