JP2001245235A - Digital broadcast receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a digital broadcast receiver which can obtain network information and program information and can select service, even when desired TS-ID in TMCC information does not exist for some reason, such as a broadcast pause. SOLUTION: When power is turned on (S1), a BS-IF frequency, which is initialized is selected (S2), TMCC information which is transmission information is obtained (S3) and the presence or absence of initialized TS-ID is judged (S4). When initialized TS-ID is present (YES) in S4, network information and program information, which exist in TS data, are obtained (S6). When initialized TS-ID is absent ('NO'), other TS-ID is selected from TMCC information (S5), and network information and program information, which exist in TS data, are obtained (S6). Then, desired service is selected using the information (S7).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital broadcast receiver, and more particularly to a digital broadcast receiver which operates stably even when a desired transport stream does not exist in BS digital broadcast.

[0002]

2. Description of the Related Art In recent years, digitalization of broadcasting has been progressing.
In Japan, BS digital broadcasting using BS is scheduled from 2000. In BS digital broadcasting, a plurality of transport streams (hereinafter, referred to as TS) are provided for one frequency.
Is a unique system in Japan. FIG. 3 shows B
FIG. 2 is a diagram for describing an outline of a transmission system of S digital broadcasting. FIG. 3A shows a data frame configuration of BS digital broadcasting, where one frame is composed of a group of 48 TSs. FIG. 3B shows the frame structure of the TMCC signal in the header part of each TS in FIG. 3A, in which information relating to the structure of each TS is inserted into the 46-byte TMCC information. I have.

FIG. 3 (C) shows the internal structure of TMCC information, in which each slot specifies which transport (TS-I
D) relative TS / slot information of 144 bits and relative TS / TS-ID correspondence information of 128 bits, and transmission mode information of 40 bits on which transmission mode (modulation method) the TS-ID is transmitted. include. In a BS digital broadcast receiver, during normal tuning, first, a BS-IF frequency is selected, and then TMCC information, which is transmission information, is obtained. After confirming, a desired TS can be obtained by performing a selection process.
At the receiver, the BS-IF frequency where the desired service exists, T
Since the S-ID and the like are obtained in advance at an arbitrary time during energization based on the network information or the like existing in the TS data and temporarily stored, the channel selection operation is performed without any problem using this information.

However, when the above network information is not held, for example, immediately after the power is turned on, the BS-IF frequency and the TS-ID in which the service to be received exists exist.
Since it is not known, the setting of the selected BS-IF frequency and TS-ID in the initial state is generally fixedly determined, or the setting can be made in a user menu.

FIG. 4 is a flowchart for explaining the operation of a conventional BS digital broadcast receiver. First, when the power is turned on (S1: step 1), the initially set BS is set.
-Select an IF frequency (S2), acquire TMCC information as transmission information (S3), and determine whether or not there is an initially set TS-ID (S4). At S4, if there is an initially set TS-ID (YES), the network information existing in the TS data
The program information is acquired (S6), and a desired service is selected by using the acquired program information (S7), and the process ends (S8). In S4, if there is no initially set TS-ID (NO), a message such as "cannot select" or "no service" is displayed (S9), and the process returns to S4, where the desired TS-ID continues. Keep waiting to come.

[0006]

In a conventional BS digital broadcast receiver, the TMCC may be interrupted for some reason such as suspension of broadcasting.
If there is no desired TS-ID in the information, network information or program information cannot be obtained, and there is a major problem that service selection cannot be performed. The present invention has been made in order to solve the above-described problem, and even when a desired TS-ID in TMCC information does not exist for some reason such as a pause in broadcasting, the same BS-IF frequency arbitrarily set and selected. It is another object of the present invention to provide a digital broadcast receiver capable of acquiring network information, program information, and the like and selecting a service because another transport stream is selected.

[0007]

In order to achieve the above object, in a digital broadcast receiver for receiving a digital broadcast in which a plurality of transport streams are mixed in one transmission frequency, a digital broadcast receiver receives a desired BS from an input signal. A BS front end unit for selecting a signal of an IF frequency and outputting I and Q baseband signals, an AD unit for converting the I and Q baseband signals into digital signals and outputting the digital signals, and an output signal of the AD unit A PSK demodulation unit that performs demodulation processing of the demodulated digital signal and outputs a demodulated digital signal; an error correction unit that outputs TS data obtained by error-correcting the demodulated digital signal and TMCC information in the TS data; And a TMCC decoding unit that outputs transmission information and selected TS information obtained by decoding the TS data.Based on the selected TS information, a specific
A TS selection output unit that selects and outputs TS data, a DEMUX unit that decodes the specific TS data, performs a sorting process, and outputs audio data and video data, and controls various operations in the digital broadcast receiver. And a control unit that performs initialization when the power is turned on.
The BS-IF frequency is selected, the TMCC information is obtained, the presence / absence of the initially set TS-ID is determined, and if there is the initially set TS-ID, the network information / If program information is acquired and there is no TS-ID initialized, TMC
Provided is a digital broadcast receiver characterized by selecting another TS-ID in the same BS-IF frequency from C information and controlling to acquire network information and program information existing in the TS data. Things.

[0008]

FIG. 1 is a block diagram showing an embodiment of a BS digital broadcast receiver according to the present invention. In FIG. 1, a BS-IF signal received by a BS antenna (not shown) is supplied to a BS front end unit 1. The BS front-end unit 1 selects a desired BS-IF frequency according to a channel selection instruction from the control unit 13 and
/ Q detection, then output I and Q baseband signals,
It is supplied to the AD unit 2. The AD unit 2 converts the I and Q baseband signals into digital signals and supplies them to the PSK demodulation unit 3.

The PSK demodulation unit 3 performs demodulation processing such as carrier reproduction and clock reproduction to obtain a demodulated digital signal.
It is supplied to the error correction unit 4. The error correction unit 4 corrects the error of the demodulated digital signal and performs deinterleaving and the like.
The TS data is obtained and supplied to the TS selection output unit 5 together with the clock. At the same time, TMCC information in the header part of the TS data is extracted and supplied to the TMCC decoding unit 6. The TMCC decoding unit 6 decodes the obtained TMCC information and supplies transmission information and selected TS information to the control unit 13. The TS selection output unit 5 selects specific TS data from the digital signal based on the selected TS information from the control unit 13 and
To supply.

The DEMUX unit 7 decodes and sorts data, and supplies audio data to an audio decoding unit 8 and video data to an MPEG-VIDEO decoding unit 10, respectively. The audio decoder 8 decodes the audio data and supplies it to the D / A audio output processor 9. The D / A audio output processing unit 9 performs an analog conversion process, obtains an analog audio signal, and outputs it from an analog audio output terminal. On the other hand, the MPEG-VIDEO decoding unit 10
MPEG2 is decoded and supplied to the Graphic unit 11. The Graphic unit 11 adds a Graphic to this, and
/ A video output processing unit 12. The D / A video output processing unit 11 performs an analog conversion process to obtain an analog video signal, which is output from an analog video output terminal.
The control unit 13 also performs various controls in the BS digital broadcast receiver, such as ON / OFF control of the power supply unit 14. Hereinafter, the control operation by the control unit 13 will be described.

FIG. 2 is a flowchart for explaining the operation of the BS digital broadcast receiver according to the present invention. First, when the power is turned on (S1: step 1), the initially set BS is set.
-Select an IF frequency (S2), acquire TMCC information as transmission information (S3), and determine whether or not there is an initially set TS-ID (S4). At S4, if there is an initially set TS-ID (YES), the network information existing in the TS data
The program information is acquired (S6), and a desired service is selected by using the acquired program information (S7), and the process ends (S8). At S4, if there is no TS-ID initialized (NO), another T-ID is determined from the TMCC information.
An S-ID is selected (S5), network information / program information existing in the TS data is obtained (S6), and a desired service is selected using this information (S7), and the process is terminated (S8).

In the above description, the initially set TS
-If there is no ID, another TS-ID is automatically selected from the TMCC information, but if there is no initially set TS-ID, information about the program such as a program list display is first displayed, It goes without saying that another TS-ID designated by the user may be selected. As described above, in the present invention, the initial setting
After selecting the BS-IF frequency, if the desired TS-ID does not exist based on the TMCC information that is the transmission information, by selecting another existing TS-ID, the network information necessary for service selection can be obtained. Acquisition of program information etc. can be performed reliably, and even in the initial state such as when the power is turned on,
The problem that the service cannot be selected is solved. That is, even if the initially set TS does not exist for some reason, the TS can be reliably obtained and the program information necessary for the service selection can be obtained, so that the problem that the service cannot be selected is solved. .

[0013]

According to the digital broadcast receiver of the present invention, even if the desired TS-ID in the TMCC information does not exist for some reason, such as suspension of broadcasting, other digital broadcast receivers within the same BS-IF frequency arbitrarily set and selected can be used. Since the transport stream is selected, network information, program information, and the like can be obtained, and there is an extremely excellent effect that a service can be selected.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a flowchart for explaining the operation of the present invention.

FIG. 3 is a diagram for explaining an outline of a transmission method of BS digital broadcasting.

FIG. 4 is a flowchart for explaining the operation of the conventional example.

[Explanation of symbols]

 Reference Signs List 1 BS front end section 2 AD section 3 PSK demodulation section 4 Error correction section 5 TS selection output section 6 TMCC decoding section 7 DEMUX section 8 Audio decoding section 9 D / A audio output processing section 10 MPEG-VIDEO decoding section 11 Graphic section 12 D / A video output processing unit 13 Control unit 14 Power supply unit

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04N 7/08 H04N 7/08 Z 7/081

Claims (1)

[Claims] 1. A digital broadcast receiver for receiving a digital broadcast in which a plurality of transport streams are mixed in one transmission frequency, wherein a signal of a desired BS-IF frequency is selected from an input signal, and a signal of I and Q is selected. A BS front-end unit for outputting a baseband signal; an AD unit for converting the I and Q baseband signals into digital signals; and outputting the demodulated digital signals. A demodulation unit, an error correction unit that outputs TS data obtained by error-correcting the demodulated digital signal and TMCC information in the TS data, and transmission information and a selected TS obtained by decoding the TMCC information.
A TMCC decoding unit that outputs information; a TS selection output unit that selects and outputs specific TS data from the TS data based on the selected TS information; and decodes and sorts the specific TS data and performs audio processing. A DEMUX unit that outputs data and video data, and a control unit that controls various operations in the digital broadcast receiver.The control unit, when power is turned on, sets an initially set BS-IF frequency. Select, get the TMCC information and set the default TS
-Determine the presence or absence of the ID, if there is an initially set TS-ID, obtain the network information and program information present in this TS data, and if there is no initially set TS-ID, from the TMCC information A digital broadcast receiver which selects another TS-ID in the same BS-IF frequency and controls so as to acquire network information and program information existing in the TS data.