JP4374946B2 - Digital broadcast receiver - Google Patents

Description

  The present invention relates to a digital broadcast receiving system built in a CRT television receiver, a liquid crystal television receiver, a plasma television receiver, or the like.

  In a television receiver equipped with a digital broadcast receiving function, a digital broadcast having a digital reception board on which a microcomputer for controlling digital signal reception processing is mounted and a video signal processing board on which a microcomputer for controlling chassis of the television receiver is mounted. The receiving system is practically shared so that the system can be easily developed in various receiver groups such as a CRT television receiver, a liquid crystal television receiver, and a plasma television receiver.

  In a practical digital broadcast receiving system, the main microcomputer is mounted on the video signal processing board, the chassis-specific control data is held in the EEPROM on the video signal processing board, and the digital receiving board is classified into the corresponding chassis type. Only the data related to the independent digital reception is held in the EEPROM on the digital reception board.

  On the other hand, as a means for replacing a chassis board at the time of service or repair as a television receiver, as means for facilitating maintenance by omitting troublesome input of various setting values such as state values at the time of adjustment and microcomputer activation. No. -224706 is known.

  As shown in FIG. 2, a control composed of an input unit 201 for receiving input from a remote controller, a tuning microcomputer 202 for identifying and controlling the operation, and an EEPROM 204 for storing various setting values for starting the microcomputer. The printed circuit board 205, the receiving circuit unit printed circuit board 211 including the tuner 207 and the video circuit 208 are provided with the EEPROM 209, and various setting values immediately before the replacement of the control unit printed circuit board 205 are written in the EEPROM 209 on the received circuit unit circuit board 211. There is a technical example in which the EEPROM 204 on the control unit printed circuit board 205 replaced with the EEPROM 209 on the reception circuit unit printed circuit board 211 storing the setting value immediately before the replacement after replacing the control unit printed circuit board 205 is replaced with the receiving circuit. There is no microcomputer on the printed circuit board. Without the case of adding the digital reception function to the reception circuit section in a form with a main microcomputer, maintainability can not be secured with respect to the exchange of the reception circuit unit board.

In order to rationalize the microcomputer on the digital receiving board, the microcomputer on the video signal processing board, and the peripheral circuits such as OSD display, the microcomputer on the digital receiving board is the main microcomputer, and the microcomputer on the video signal processing board only performs chassis control. When a system that uses a sub-microcomputer is put into practical use, it is necessary to store setting data unique to the chassis in an EEPROM on the digital receiving board.
Japanese Patent Laid-Open No. 10-224706

  When the main microcomputer is mounted on the digital receiving board, it is necessary to write the standard values of various setting data unique to the chassis to the EEPROM on the digital receiving board for each corresponding chassis at the time of shipment. However, there is a problem that maintenance such as production and substrate management in the market becomes complicated.

  In order to solve the above problems, a digital broadcast receiving system according to the present invention includes an EEPROM for holding standard values of various setting data for operating the receiver on the digital reception board, and standard values of various setting data from the EEPROM. And a main microcomputer that controls the OSD display circuit to display the OSD on the display device and communicates with the chassis control microcomputer to control the chassis, and on the video signal processing board, the chassis discrimination data and the chassis specific A chassis control microcomputer for reading chassis-specific data from the EEPROM and controlling chassis by reading chassis-specific data or transmitting chassis determination data to the main microcomputer on the digital receiving board. Each EEPROM from the EEPROM on the digital receiving board. So that Yomiwakeru standard values of various setting data corresponding to the.

  As described above, in the digital broadcast receiving system of the present invention, the standard values of various setting data corresponding to the chassis are read from the EEPROM on the digital receiving board by the chassis determination data received from the chassis control microcomputer by communication. The standard values of various setting data for all compatible chassis can be stored in the EEPROM on the digital receiving board, and the maintainability such as production and board management in the market is improved without increasing the number of digital receiving boards. Can do.

  In the present invention, the standard values of various setting data for all the corresponding chassis are held in the EEPROM on the digital receiving board, and the chassis discrimination data are held in the EEPROM on the video signal processing board. The most important feature of the present invention is that the discrimination data is transmitted to the main microcomputer on the digital receiving board, and the standard values of the various setting data for the corresponding chassis are read out according to the received chassis discrimination data.

  FIG. 1 is a block diagram of an embodiment of the apparatus of the present invention, wherein 101 is a key input circuit such as a remote control or a body button, 102 is an analog input selection circuit such as a UV tuner or video input, 103 is a chassis control microcomputer, 104 is an EEPROM that holds chassis-specific control data and chassis discrimination data, 105 is a video signal processing circuit, 106 is a display device driving circuit, 107 is a video signal processing board, 108 is a digital broadcast receiving antenna, 109 is a digital tuner, 110 Is an AV decoder that decodes TS and converts it into a video signal, 111 is a main microcomputer that commands digital reception control, OSD display control, and chassis control, and 112 holds various setting data and standard values for all corresponding chassis EEPROM, 113 is an OSD display circuit, and 114 is a digital receiving board.

  The operation of the digital broadcast receiving system configured as described above will be described below.

  The chassis control microcomputer 103 receives a user operation from the key input circuit 101 and notifies the main microcomputer 111 of input information via a serial bus or the like. The main microcomputer 111 determines which input signal is to be displayed on the display device from the received input information, which channel is selected, and the like. When displaying the digital broadcast signal, the main microcomputer 111 controls the digital tuner 109 to input the user. The selected digital channel is selected, the AV decoder 110 is controlled, the obtained TS is decoded, converted into a video signal, and output to the video signal processing circuit 105. At the same time, the main microcomputer 111 reads various necessary setting data from the EEPROM 112, draws various OSD displays through the OSD control circuit 113, and transmits various control commands to the chassis control microcomputer 103. Upon receiving the control command, the chassis control microcomputer 103 controls the analog input selection circuit 102, reads various chassis specific data from the EEPROM 104, and controls the video signal processing circuit 105 according to the read data to select the video signal. Then, the output image signal is output to the display device driving circuit 106 after adjustment. The display device driving circuit 106 converts the received output video signal into an output signal form corresponding to the display device of the chassis such as CRT or liquid crystal, and drives the display device.

  Now, the standard values of various setting data of video and audio are held in the EEPROM 12, but this standard value is often different for each chassis, and considering the shipping state of the EEPROM 112 of the digital receiving board 114, it is used for various chassis. Since the types of digital receiving boards 114 are increased, it becomes necessary to manage each chassis for production and market, so that the management becomes complicated, and there is a problem in maintainability for repair.

  In order to avoid the problem of management complexity and maintainability, all the standard values of various setting data for each chassis are held in the EEPROM 12, and the standard values for each chassis are stored for each chassis combined with the digital receiving board. The OSD display may be performed separately and the command may be notified to the chassis control microcomputer.

  Therefore, the chassis control microcomputer 103 reads chassis determination data from the EEPROM 104 when the power is turned on, and notifies the main microcomputer 111 via a serial bus or the like. The main microcomputer 111 reads the standard values of various setting data corresponding to the chassis from the EEPROM 112 on the digital reception board 114 based on the chassis determination data received from the chassis control microcomputer 103 by communication.

  As described above, the standard values of various setting data for all the corresponding chassis are held in the EEPROM on the digital reception board, and the chassis determination data is transmitted from the chassis control microcomputer to the main microcomputer on the digital reception board. By distinguishing the standard values of the various setting data for the corresponding chassis according to the discrimination data, it is possible to improve maintainability without increasing the number of types of digital receiving boards.

  In addition, even when the digital receiving board 114 is sold on an OEM basis, the present invention can share a plurality of standard values of setting data according to the OEM destination, which is advantageous for sales development.

  The same effect can be obtained not only in the field of television receivers but also in various consumer devices incorporating a digital broadcast receiving function such as a DVD recorder / player and a hard disk recorder.

1 is a block diagram of a digital broadcast receiving system according to an embodiment of the present invention. Block diagram of a television receiver in one conventional example

Explanation of symbols

101 Key input circuit 102 Analog input selection circuit 103 Chassis control microcomputer 104 EEPROM
105 video signal processing circuit 106 display device drive circuit 107 video signal processing board 108 digital broadcast receiving antenna 109 digital tuner 110 AV decoder 111 main microcomputer 112 EEPROM
113 OSD display circuit 201 Input unit 202 Tuning microcomputer 203 Display circuit 204 EEPROM
205 Control Unit Printed Circuit Board 206 Antenna 207 Tuner 208 Video Circuit 209 EEPROM
210 CRT
211 Printed circuit board for receiving circuit

Claims (1)

A first EEPROM holding its own chassis discrimination data;
When the power is turned on, the chassis determination data is read from the first EEPROM, the chassis determination data is transmitted to a main microcomputer to be described later, a control command to be described later is received from the main microcomputer, and a video signal processing circuit is operated based on the control command. A chassis control microcomputer to control,
A video signal processing board comprising:
A second EEPROM for holding standard values of various setting data for all corresponding chassis for video and audio;
Based on the chassis discrimination data received from the chassis control microcomputer, the standard values of various setting data for the chassis corresponding to the chassis discrimination data are read from the second EEPROM.
A main microcomputer that transmits a control command based on the standard value to the chassis control microcomputer, and controls a digital tuner, an AV decoder, and an OSD display;
A digital receiving board comprising:
A digital broadcast receiver.

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