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:
Oct. 15, 2002
Filed:
Oct. 31, 2000
Hisayoshi Moriwaki, Tokyo, JP;
Takashi Kohashi, Tokyo, JP;
Yuji Kimura, Kanagawa, JP;
Akira Ogino, Tokyo, JP;
Nozomu Ikeda, Tokyo, JP;
Sony Corporation, Tokyo, JP;
Abstract
Video signals are converted into one or more blocks for each predetermined unit amount of data, and a Discrete Cosine Transform (DCT) process is performed in the blocks a convert the video signal from a time-base area signal to a DCT coefficient in a frequency area for data compression. One chip of a spread spectrum signal is allocated to each block of the video signal or to each of a plurality of blocks, and additional information is superimposed on the video signal at a constant level corresponding to the chip value for transmission. A video signal on which the additional information consisting of the spread spectrum signal transmitted has been superimposed is received, and from this received signal, a DC component of the DCT coefficient is extracted. Inverse spread spectrum processing is performed for the DC component of the DCT coefficient extracted to detect the additional information.