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| Television sound signal processor |
| What is claimed is: 1. In a video signal processing system including a section for processing an IF ... |
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| Apparatus for incorporating digital signals with a standard TV signal |
| The present invention includes apparatus for removing video signal from at least a portion of the ... |
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| Structure and method for supporting a flexible substrate |
| OF THE PREFERRED EMBODIMENTS FIG. 2 is a partial cross-sectional view of the present invention ... |
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| Television receiver control box that contains a card reader mounted directly to a motherboard |
| The present invention is a television receiver control box which has a motherboard located within ... |
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| Composite powdered metal component |
| OF PREFERRED EMBODIMENTS OF THE PRESENT INVENTION With reference first to FIG. 4, a component 19 ... |
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| Facsimile apparatus |
| The present invention has been made in consideration of the above situation, and has as its object ... |
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| Help service function control device added to a multi-channel monitor of a personal computer |
| The present invention provides a help service function control device which is added to a multi-... |
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Digital television broadcasting system
| Details |
Inventors: Kawaguchi, Toru; Tsukidate, Ryota; Takeuchi, Yoshiyasu;
Assignee: Matsushita Electric Industrial Co., Ltd. (Osaka, JP)
Primary Examiner: Eisenzopf; Reinhard J.
Assistant Examiner: Natnael; Paulos M.
Attorney, Agent or Firm: Gopstein; Israel
A digital television transmitter transmits a transport stream (hereinafter referred to as "TS") comprising content data for a plurality of channels to receivers. In the transmitter, program information is periodically inserted in the TS; and an expected time of program alteration is included in said TS. A television receiver comprises a first portion always supplied with an electric power, a second portion which, if supplied with a second electric power, becomes capable of collecting program information included in said TS in corporation with said first portion, and a third portion which. if supplied with a third electric power, becomes capable of displaying said program. At an expected time of program alteration previously received, the second power is supplied to the second portion to collect program information, which is preferably stored in nonvolatile memory. The transmitter sending an alert signal to the receiver via a second transmission media ensures the reception of changed or special program information. |
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DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG.
1 is a diagram showing an exemplary arrangement of a digital TV broadcasting system in accordance with an illustrative embodiment of the invention.
The present invention is applicable to any broadcasting system that frequently transmits program information together with the program contents in a multiplexed manner.
However, in FIG.
1, the digital TV broadcasting system 1 is assumed to be a satellite broadcasting system.
The broadcasting system 1 comprises at least one broadcasting satellite earth station or digital TV transmitter 2 for transmitting a transport stream comprising a plurality (M) of channels, a broadcasting satellite space station 3 which relays transport streams including the one from the digital TV transmitter 2, a multiplicity of digital TV receivers 4 for receiving the transport streams from the space station 3, and a second transmission media 5 which enables the digital TV transmitter 2 to inform the TV receivers 4 of irregular broadcasts such as special and emergency broadcasts and/or changes in the program information.
The second transmission media 5 may be any transmission media which is other than the broadcasting satellite 3 and which causes the power consumption in each TV receiver 4 during waiting for a communication from the earth station 2 to be less than the power consumption in each TV receiver 4 during receiving the program information without using program contents, i.
e.
, without displaying any program.
Some examples of the second transmission media 5 are a telephone network, a power line, an AM (amplitude modulation) or FM (frequency modulation) radio wave, a CATV, etc.
The digital TV transmitter 2 comprises M channel units 201 each for supplying a contents data stream of each of the programs for the channel; a computer 202 for preparing and storing PSI (Program Specific Information described later) data and SI/EPG (Service Information/Electronic Program Guide) data; a data buffer 203 for temporarily storing the PSI and SI/EPG data (or program data or information); a transmission unit 204 for multiplexing and transmitting the contents data streams and the program information; and a transmission controller 205 for controlling the data buffer 203 and the transmission unit 204
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