JPH11312956A - Digital broadcast receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily select programs having high quality and various services and to enable the user to preferentially select a program which the user wants by rearranging stored header information by a prescribed classification of information and performing channel selection in the order of data thereafter. SOLUTION: In a TDM demodulation circuit 6, a TDM frame synchronous detection part establishes frame synchronism by a synchronizing signal, and header part data are stored in a memory of a microcomputer 4 by a TDM header read part 8 after this establishment. Memory contents are rearranged in order from the largest value by sampling frequency information of individual programs of header information, and first data are read in by channel selection key input from a key input part 10, and correspondent channel data are decoded by a channel decoder 9 and is outputted. This operation is repeated to reproduce data in order from the maximum value of sampling frequencies as first data in the memory, thus a broadcast desired by the user is selected.

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 for receiving a digital audio broadcast, and more particularly to a technical field of a channel selection technique for selecting a broadcast program to be received.

[0002]

2. Description of the Related Art In conventional digital audio broadcasting, the transmission method is fixed or about two types, so that the sound quality of a broadcast program does not greatly differ depending on the program.

[0003] However, with the advance of the digital technology of broadcasting, many program broadcasts of various contents can be transmitted, and the broadcast itself is greatly changed from the conventional limited uniform program transmission.

[0004] Accordingly, the user desires to receive a higher quality broadcast, for example, for a broadcast of a music program.

As described above, digital audio broadcasting adopts a high compression transmission standard having many sound qualities and compression levels.
There is a tendency to perform multi-channel transmission using an optimal transmission standard according to the sound quality content of the broadcast.

[0006] Therefore, it is preferable from the viewpoint of diversification of programs that broadcasting of various sound quality levels is performed under limited transmission capacity, but a desired program is selected from many broadcast programs. This requires complicated operations.

[0007] Therefore, the function of the digital broadcasting receiver needs to be more convenient and suitable for various program broadcasting.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a receiver for receiving a broadcast in which data of a large number of channels is multiplexed. It is an object of the present invention to make it possible to easily select a program in which a program is performed, and to enable a user to select a desired program preferentially.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a method in which data obtained by time-division multiplexing a plurality of program data and a digital broadcast signal to which a header section having information on each program is added. The receiving digital broadcast receiver has a header reading section for reading the information of the header section, and a memory for storing the header information read by the header reading section, and specifies the header information stored in the memory. Are rearranged based on the information of the type, and the channel selection operation is performed in the order of the rearranged data.

[0010] The specific type of information is a sampling frequency of a broadcast program, and the rearrangement is performed in descending order of the sampling frequency.

[0011] Further, the apparatus has a tuning key, and the specific type of information is made to correspond to the tuning key. When the tuning key is pressed, the memory is rearranged based on the specific type of information. Is performed.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a digital broadcast receiver according to the present invention will be described below with reference to FIGS.

FIG. 1 is a block diagram of a digital broadcast receiver according to the present invention.

In FIG. 1, (1) is an antenna for receiving radio waves from a broadcasting satellite.

Here, data of each channel of a broadcast wave from a broadcast satellite is multiplexed by a TDM (time division multiplex) method,
Transmitted after SK modulation.

As shown in FIG. 2, the frame structure of the channel data according to the TDM system is, as shown in FIG. 2, a broadcast signal divided into time slots following a synchronization signal for synchronizing the frame and a header section having various information relating to the channel data. It has a configuration.

(2) is an RF front-end processing unit which selects a specific broadcast wave from radio waves received by the antenna (1) and converts it into an intermediate frequency.

The RF front-end processing unit (2) performs processing by a synthesizer method using a PLL circuit (3) including a programmable frequency divider. At this time, the frequency division ratio of the programmable frequency divider is determined by a microcomputer (4). The receiving frequency is selected under the control of (3).

Reference numeral (5) denotes a QPSK demodulation circuit, to which an output of the RF front-end processing unit (2) is input, and a baseband signal is demodulated from a phase-modulated carrier.

This demodulation is performed by a synchronous detection method. This synchronous detection method is a well-known technique, and a detailed description thereof will be omitted.

(6) is a TDM demodulation circuit, which is QPSK
An output signal of the demodulation circuit (5) is supplied, and data for each channel is formed and output.

In the TDM demodulation circuit (6), a TDM frame synchronization detection section (7) first establishes frame synchronization based on a synchronization signal. After the frame synchronization is established, a TDM header reading section (8) reads the header section. The data is read by the microcomputer (4).

In this header part, as shown in FIG.
The slot identification number for identifying which channel each of the time slots 1 to n is data of, the broadcasting station name of the channel, the language used for broadcasting, the sampling frequency, information on the contents of the program, etc. include.

The microcomputer (4) reads out which time slot contains the data of the channel to be received from the header, and inputs the slot identification number (one or more) to the channel decoder circuit (9).

The channel decoder circuit (9) synthesizes time slot data based on the slot identification number input from the microcomputer (4) and reconstructs data of one channel.

As a result, the TDM demodulation circuit (6)
The operation shown in FIG.

This example shows a case where transmission is performed by being divided and multiplexed into seven time slots (slots 1 to 7).
4 and 6, and TDM for each frame.
The data of channel A is extracted by extracting the data of time slots 1, 4, and 6 from the bit stream and combining them.

An operation switch section (10) has a channel selection key switch for calling a broadcast station stored in the memory.

The microcomputer (4) performs the following tuning operation under program control.

In the first embodiment, the header information of each channel is read into the memory, the header information is rearranged in the order of the sampling frequency, and then the channel selection key is operated to select the channel in the order of the sampling frequency. It is possible.

First, when a broadcast wave is received by the antenna (1), the broadcast wave is converted into an intermediate frequency by the RF front processing unit (2), and the baseband signal is further demodulated by the QPSK demodulation circuit (5).

The demodulated data is processed according to the flowchart shown in FIG.

First, in step 1, a TDM demodulation circuit (6)
Frame synchronization is performed by the TDM frame synchronization detection unit (7).

When frame synchronization is established, in step 2, header information is extracted by TDM demodulation, and various header information is stored in the memory in the order in which the header information was extracted.

Further, in step 3, the contents of the memory are rearranged (sorted) in descending order of value based on the sampling frequency information of each program in the header information.

In this state, a standby state is entered until a tuning key is input.

When a channel selection key is input, channel selection reproduction of received data is performed according to the flow of FIG.

In step 4, the value of n meaning the n-th data in the memory is initialized to 1.

In step 5, the first data is read, and the corresponding channel data is decoded.

By outputting the data decoded in step 6 to the audio processing unit, the data is converted into an analog audio signal and output from the speaker.

In this state, if a tuning key is further input within a predetermined period, the value of n is incremented, and the processing from step 5 onward is performed similarly for the second data (steps 7 to 9).

As a result, the second channel data is reproduced in step 6.

If the channel selection key is not input within a predetermined period, this processing is terminated, and the n-th data is reproduced continuously.

Therefore, by repeating the operations of steps 5 to 9, data can be reproduced in order from the highest sampling frequency, which is the first data in the memory, and a broadcast desired by the user can be selected.

Next, a second embodiment of the present invention will be described.

In this embodiment, based on a plurality of pieces of information included in the header information, the priority of channel selection is determined under predetermined conditions and stored in a memory.

As in the first embodiment, when a broadcast wave is received by the antenna (1), the broadcast wave is converted into an intermediate frequency by the RF front processing unit (2), and the baseband signal is further converted by the QPSK demodulation circuit (5). Is demodulated.

Hereinafter, the control is performed according to the flowchart of FIG.

At step 11, TDM of the TDM demodulation circuit (6)
Synchronization is achieved by the DM frame synchronization detector (7).

In step 12, TDM demodulation is performed to extract header information.

In step 13, the contents of the memory are rearranged in descending order of value based on the sampling frequency information of each program in the header information.

In step 14, the contents of the memory are rearranged in descending order based on the sampling frequency information. Further, in step 15, the contents of the memory are rearranged according to the broadcast program information which is one of the header information.

For example, priorities of program categories desired by the user such as music programs, news, sports programs, etc. are set in advance, stored in a memory, and data is rearranged based on the priorities.

As a result, data is set in the memory for each program category in ascending order of the sampling frequency.

In this state, it waits for an operation key to be input.

When the channel selection key is input, channel selection reproduction of the received data is performed according to the flow of FIG.

This operation is the same as that of the first embodiment, and will not be described.

The rearrangement can be performed in the same manner based on the broadcast language information and the broadcast station information, and can also be performed in combination with the above operation.

In this way, when rearranging the data, it is possible to determine the priority based on the broadcast language and the program content information which are the header information set in advance.

[0060]

As described above, according to the digital broadcast receiver of the present invention, it is possible to select a digital broadcast program in which data of a large number of channels having different sound quality levels is multiplexed, from a program having a large bit rate. This makes it possible to easily select a channel that provides high-quality services, and to select a channel according to a preset order based on program information data such as a program genre, a language used, and a broadcasting station. This allows the operator to easily select a desired program.

[Brief description of the drawings]

FIG. 1 is a block diagram of a digital broadcast receiver according to the present invention.

FIG. 2 is a diagram illustrating a frame configuration of channel data.

FIG. 3 is a data configuration diagram of a header part.

FIG. 4 is a diagram showing a TDM demodulation operation;

FIG. 5 is a flowchart of control according to the first embodiment of the present invention.

FIG. 6 is a flowchart of a channel selection operation.

FIG. 7 is a flowchart of control according to a second embodiment of the present invention;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Antenna 2 RF front-end processing part 3 PLL circuit 4 Microcomputer 5 QPSK demodulation circuit 6 TDM demodulation circuit 7 TDM frame synchronization detection part 8 TDM header reading part 9 Channel decoder circuit 10 Key input part

Claims (6)

[Claims] 1. A digital broadcast receiver for receiving data obtained by time-division multiplexing of a plurality of program data and a digital broadcast signal to which a header having information on each program is added, wherein the information of the header is read. A header reading unit to take, and a memory for storing header information read by the header reading unit, and sort the header information stored in the memory based on a specific type of information of the header information, A digital broadcast receiver characterized by performing a channel selection operation in the order of data after sorting. 2. The digital broadcast receiver according to claim 1, wherein the specific type of information is a sampling frequency of a broadcast program, and the sorting is performed in descending order of the sampling frequency. 3. A memory having a channel selection key, wherein the specific type of information is made to correspond to the channel selection key, and when a key is input by the channel selection key, the memory is set based on the specific type of information. 3. The digital broadcast receiver according to claim 1, wherein the digital broadcast receiver performs sorting. 4. A digital broadcast receiver for receiving data obtained by time-division multiplexing of a plurality of program data and a digital broadcast signal to which a header having information on each program is added, wherein the information of the header is read. And a memory for storing header information read by the header reading unit. The header information stored in the memory is sorted based on a first specific type of information. A digital broadcast receiver that sorts the header information stored in the memory based on the second specific type of information, and performs a channel selection operation in the order of the sorted data. 5. The information of the first specific type is a sampling frequency of a broadcast program, the information of the second specific type is genre data of a broadcast program, and the sorting has a large sampling frequency value. 5. The digital broadcast receiver according to claim 4, wherein the broadcast is performed in order and the genre data of the broadcast program is performed in a predetermined order. 6. A tuning key, wherein the first and second specific types of information are made to correspond to the tuning key, and when a key input is performed by the tuning key, the specific type is selected. 6. The digital broadcast receiver according to claim 4, wherein said memory is sorted based on information.