Telecommunications – Interference signal transmission
Patent
1997-04-01
1999-04-20
Grant, Chris
Telecommunications
Interference signal transmission
455 62, 348 10, 348 12, H04N 7173
Patent
active
058965556
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.
REFERENCES:
patent: 5357276 (1994-10-01), Banker et al.
patent: 5438355 (1995-08-01), Palmer
patent: 5570295 (1996-10-01), Isenberg et al.
patent: 5649284 (1997-07-01), Yoshinobu
Grant Chris
Maioli Jay H.
Sony Corporation
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