JP2007116321A - Digital broadcast receiver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a digital broadcast receiver for improved reliability of a system that can uniquely determine time setting of the digital broadcast receiver, and perform synchronous process such as updating of time display and program table and executing of program recording reservation. <P>SOLUTION: A TS decoder 15 is supplied with inputs or TS of digital broadcast waves from network interface modules (NIM) 13 and 14, and digital recorder/reproducer 10. A system controller 17 controls reflection of TOT information of arbitrary broadcast from additional information signals, and controls recording reservation at current time and data acquisition timing for a program table. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a digital broadcast receiver capable of receiving digital broadcast waves.

  Currently, services using digital broadcasting of broadcasting satellites (BS) and communication satellites (CS) have been started. For the digital broadcast wave, a method called a transport stream is used, and a digital broadcast wave in which program (program) data is multiplexed is transmitted by a plurality of transport streams. The digital broadcast wave includes various data in addition to the program data. Among these, the current time information includes the time date table (TDT: Time Data Table) and the actual time such as daylight saving time and the human system. A data group having a PID (Packet Indentification) called a time date offset table (TOT) that indicates the difference time of the display time is included.

  The TOT includes time offset values and the like as data when JST (Japan Standard Time) time, date, and daylight saving time are introduced. In the present terrestrial digital / BS / wide-area CS digital broadcasting, only TOT is transmitted, and TDT is not transmitted. This TOT always transmits the latest time information in a cycle of 5 seconds.

  As described above, since a digital broadcast wave includes a TOT for a digital broadcast receiver, a method for automatically adjusting the time of an electrical appliance using the TOT included in the digital broadcast wave has been proposed ( For example, see Patent Document 1.)

JP 2003-279777 A

  By the way, in ARIB (Association of Radio Industries and Businesses) standard, TOT is always assigned to BS digital broadcasting, CS digital broadcasting, and terrestrial digital broadcasting. However, a TOT is not normally assigned to a partial TS, which is a TS extracted from only a program packet used for a recording device generated by demodulating a digital broadcast wave on the digital broadcast receiver side.

  Therefore, when a partial TS from a digital recording / playback device such as a DVD recorder or a D-VHS deck is input to the digital broadcast receiver, the TOT cannot be acquired. In the meantime, the time adjustment of the digital broadcast receiver is such that the internal clock runs on its own, but since the internal clock of the digital broadcast receiver is used, there is a problem that the internal clock causes a deviation from the actual time.

When a plurality of digital broadcasts are received, a plurality of TOTs are acquired from a plurality of TSs. Since time date information in TOT is created by the transmission side, there is a slight error in the time information depending on the transmission destination. Therefore, if the internal clock is corrected for each acquired TOT, there is a possibility that the time may fluctuate frequently and the display time fluctuates frequently.
Furthermore, the time of the internal clock frequently fluctuates, affecting the system that performs the synchronization processing such as time display, program table update, and program recording reservation execution.

  The present invention has been made in view of the above points, and by acquiring the TOT used in the digital broadcast receiver from one digital broadcast wave, the time setting of the digital broadcast receiver can be uniquely determined, and the time display and It is an object of the present invention to provide a digital broadcast receiver capable of improving the reliability of a system that performs synchronization processing such as updating a program guide and executing program recording reservation.

In order to solve the above-mentioned problems, the present invention comprises the means described below.
That is,
In a digital broadcast receiver capable of inputting a plurality of digital broadcast wave inputs and a transport stream from an external digital device,
A plurality of network interface modules for demodulating the plurality of digital broadcast waves and obtaining respective transport streams;
Separation unit for separating an information signal including a time-date offset table compliant with the ARIB standard from the supplied demodulated digital broadcast wave transport stream and the transport stream from the external digital device When,
A plurality of separated time date offset tables, a control means for adjusting an internal clock as a current time by selecting the plurality of supplied time date offset tables;
A digital broadcast receiver comprising:

  According to the digital broadcast receiver of the present invention, the time setting of the digital broadcast receiver can be uniquely determined by acquiring the TOT to be used in the digital broadcast receiver from one digital broadcast wave. There is an effect that it is possible to provide a digital broadcast receiver with high reliability of a system that performs synchronization processing such as update and program recording reservation execution.

The best mode for carrying out the digital broadcast receiver according to the present invention will be described below with reference to preferred embodiments.
A digital broadcast receiver applied to the present embodiment will be described with reference to the accompanying drawings. FIG. 1 is a block diagram showing an embodiment of a digital broadcast receiver of the present invention, and FIG. 2 is a flowchart for explaining the operation of the digital broadcast receiver applied to this embodiment.

  First, a digital broadcast receiver applied to this embodiment will be described. The system configuration assumes the current digital broadcasting state. First, an RF signal is supplied from the BS / CS antenna 11 to the digital broadcast receiver 1, and the network interface module (NIM) 13 in the digital broadcast receiver 1 is tuned to a predetermined transponder frequency. Then, it is demodulated into a transport stream TS which is a digital bit stream signal and supplied to the TS decoder unit 15.

  Similarly, an RF signal is supplied from the terrestrial digital antenna 12 to the digital broadcast receiver 1, and is input thereto, and is tuned to a predetermined transponder frequency in the network interface module (NIM) 14 in the digital broadcast receiver 1. Then, it is demodulated into a transport stream TS which is a digital bit stream signal and supplied to the TS decoder unit 15.

  A transport stream (partial TS) is input to the digital broadcast receiver 1 from the digital recording / reproducing device 10 such as a DVD recorder or a D-VHS deck, and supplied to the TS decoder unit 15.

  The TS decoder unit 15 is supplied with the plurality of transport streams. First, if the transport stream is scrambled by pay broadcasting or the like, it is descrambled and converted into a regular transport stream. Thereafter, the regular transport stream is separated into a video signal, an audio signal, and an additional information signal (caption data, section data, etc.), and the video / audio signal to be viewed is output to the AV decoder 16. In the AV decoder 16, the video / audio signals to be viewed are converted into normal video / audio analog signals, respectively, and output to the monitor 110 and the speaker 111, respectively.

  The additional information signal is analyzed and converted by another software module. The section data includes a time date table TDT, a time date offset table TOT, and the like. After the caption data is stored in a temporary memory, the display control unit 18 outputs the caption to be viewed to the monitor 110. The system controller 17 controls which broadcast TOT information is reflected in the internal clock of the digital broadcast receiver 1 and execution of recording reservation at the current time and data acquisition timing used for the program guide. The memory 19 temporarily stores data extracted from the additional information signal, and stores a program for controlling the receiver and system environment setting information.

  The operation of the digital broadcast receiver 1 configured as described above will be described in more detail. In FIG. 2, a TOT from a plurality of broadcast waves is always obtained from a receiver that is operating normally with power ON (step 0). It is determined whether the TOT acquired from the TOT setting information is from a broadcast wave currently being viewed (step 1). If the TOT is from a broadcast wave currently being viewed (Yes in Step 1), the time / date information is reflected on the internal clock of the receiver as a reference, and the information is stored as TOT setting information (Step 2).

  In the case of a TOT from a broadcast wave that is not being viewed (No in step 1), it is determined from the TOT setting information whether it is being viewed (step 3). If viewing is in progress, the TOT is discarded (step 4). When it is determined from the TOT setting information that the TOT cannot be acquired from the broadcast wave to be viewed (viewing state from the external input TS, broadcast accident, etc.) or not in the viewing state (power off, etc.) The acquired time and date information of the TOT is reflected on the internal clock of the receiver as a reference, and the information is stored as TOT setting information (step 2).

  As described above, by acquiring the TOT used in the digital broadcast receiver from one digital broadcast wave, the time setting of the digital broadcast receiver can be uniquely determined, and the time display, program table update, and program recording reservation can be made. It is possible to improve the reliability of a system that performs synchronous processing such as execution.

It is a block diagram which shows one Example of the digital broadcast receiver applied to a present Example. It is an example of the flowchart explaining operation | movement of the digital broadcast receiver applied to a present Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Digital broadcast receiver 10 ... Digital recording / reproducing machine 11 ... BS / CS antenna 12 ... Terrestrial digital antenna 13, 14 ... Network interface module (NIM)
15 ... TS decoder unit 16 ... AV decoder 17 ... System controller 18 ... Display control unit 19 ... Memory

Claims (1)

In a digital broadcast receiver capable of inputting a plurality of digital broadcast wave inputs and a transport stream from an external digital device,
A plurality of network interface modules for demodulating the plurality of digital broadcast waves and obtaining respective transport streams;
Separation unit for separating an information signal including a time-date offset table compliant with the ARIB standard from the supplied demodulated digital broadcast wave transport stream and the transport stream from the external digital device When,
A plurality of separated time date offset tables, a control means for adjusting an internal clock as a current time by selecting the plurality of supplied time date offset tables;
A digital broadcast receiver comprising:

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