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:
Feb. 15, 2005
Filed:
Apr. 12, 2001
Takahiro Okada, Saitama, JP;
Yoshikazu Miyato, Chiba, JP;
Yasunari Ikeda, Kanagawa, JP;
Tamotsu Ikeda, Tokyo, JP;
Takahiro Okada, Saitama, JP;
Yoshikazu Miyato, Chiba, JP;
Yasunari Ikeda, Kanagawa, JP;
Tamotsu Ikeda, Tokyo, JP;
Sony Corporation, Tokyo, JP;
Abstract
The time required for switch the channel can be remarkably curtailed. When broadcasting signals through a plurality of information channels with an OFDM system, the plurality of information channels are multiplexed in the sense of frequency and collectively subjected to IFFT modulation for connected transmission instead of subjecting the plurality of information channels independently to OFDM modulation for transmission. With this arrangement, the efficiency of exploitation of frequencies is improved. According to the invention, the OFDM frames are synchronized for each information channel for the purpose of connected transmission. Then, the OFDM receiver can switch the information channel for signal reception, maintaining the frame synchronizing signals.