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. 20, 1999
Filed:
Apr. 01, 1997
Hitoshi Yoshinobu, Kanagawa, JP;
Sony Corporation, Tokyo, JP;
Abstract
A multiplex broadcasting system and a multiplex broadcast signal receiver for receiving multiplex broadcast signals. composes second broadcast information of multi-frequency signals each of a combination of one tone in a first frequency group of audio bands unrelated with each other in articulation and one tone in a second frequency group of audio bands unrelated with each other in articulation, and multiplexes the second broadcast information and main broadcast audio signals. The multiplex broadcast signal receiver includes a decoder for continuously monitoring the audio signal included in the received multiplex broadcast signal, detecting multi-frequency signals to identify the combination of the multi-frequency signals, a receiver for receiving the output of the decoder as second broadcast information, and a memory for storing the second broadcast information. The stored second broadcast information is used automatically for accessing a two-way program involving the viewers.