JP2007214864A - Digital broadcast receiver using channel scan accelerating method of terrestrial digital broadcasting - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a digital broadcast receiver capable of accelerating scan by reducing object channels for measuring received signal quality in an area capable of receiving different physical channels in the same network. <P>SOLUTION: The digital broadcast receiver is provided with a means 301 for acquiring a receivable channel in channel scan of terrestrial digital broadcasting, a means 302 for determining a channel with channel selecting operation information overlapped, a means 303 for measuring the received signal quality of the overlapped channel, and a means 304 for comparing the received signal quality with each other and storing the channel with the better quality, measures, acquires and compares the received signal quality of only a channel with channel selecting operation information overlapped and stores the channel with the better received signal quality. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a receiving apparatus (international patent classification H04N17 / 00) used for digital broadcasting.

In terrestrial digital broadcasting, each network does not pass information on other networks, so it is necessary to scan all frequencies of terrestrial digital broadcasting and acquire network information of receivable channels. Further, in a region where different physical channels can be received in the same network by Multi Frequency Network (hereinafter referred to as MFN), it is required to store a channel having good reception C / N or BER in the “receivable frequency table”. As known in Japanese Patent Application Publication No. 2004-208186, the received signal quality is stored when it is determined that reception is possible at the time of scanning, and when a channel having broadcast information with overlapping channel selection operation information is received, these are duplicated. Realization is achieved by comparing the received signal quality of the broadcast and storing the channel with the better received signal quality.
JP 2004-208186 A ARIB-TR-B14 Ver.2 Ver1.5 Digital Terrestrial Television Broadcasting Receiver Functional Specification

  However, in order to acquire the received signal quality, it is necessary to wait for the signal quality to stabilize, and in the conventional technology, it is determined that reception is possible at the time of scanning even if there is no channel with overlapping channel selection operation information. Since the received signal quality is measured and stored each time, there is a problem that a stabilization waiting time of the received signal quality always occurs and it takes time until the scanning is completed.

  In order to solve the above problems, a digital broadcast receiving apparatus according to the present invention (Claim 1) scans all frequencies of terrestrial digital broadcasting in the digital broadcast receiving apparatus that performs channel scanning of terrestrial digital broadcasting and stores it in a channel list. Means for acquiring a receivable channel, means for determining a channel with overlapping channel selection operation information, means for measuring the received signal quality of the channel only when there is a channel with overlapping channel selection operation information, Means for comparing the received signal quality and storing the better channel.

  According to the present invention (Claim 2), in a digital broadcast receiving method for performing channel scan of terrestrial digital broadcast and storing it in a channel list, a step of scanning all the frequencies of terrestrial digital broadcast and acquiring receivable channels, The step of judging the channel where the station operation information is duplicated, the step of measuring the received signal quality of the channel only when there is a channel where the channel selection operation information is duplicated, and the channel for which the received signal quality is compared are stored. And a step to perform.

  A recording medium according to the present invention (Claim 3) records a computer program for executing the above digital broadcast receiving method (Claim 2), and the present invention (Claim 4) is the computer program itself. It is about.

  According to the digital broadcast receiving apparatus of the first aspect of the present invention, at the time of channel scanning of digital terrestrial broadcasting, the channel selection operation information is measured in order to measure the received signal quality of only the channel having the broadcast information in which the channel selection operation information overlaps. If there are no channels with overlapping channels, there will be no waiting for the measurement time, and even if there are channels with overlapping channel selection information, only the overlapping channels will measure the received signal quality. As a result, the scanning speed can be increased.

  The present invention relates to a digital broadcast receiving apparatus that scans a channel of terrestrial digital broadcasting and stores it in a channel list, wherein the channel selection operation information overlaps with a means for acquiring all receivable channels by scanning all frequencies of terrestrial digital broadcasting. Means for determining the channel to be used, means for measuring the received signal quality of the channel only when there is a channel with overlapping channel selection operation information, and means for storing the channel whose signal signal quality is better compared The digital broadcast receiving apparatus is characterized in that the channel scanning of digital terrestrial broadcasting can be speeded up by not measuring the received signal quality in the case of a channel where channel selection operation information does not overlap.

  FIG. 1 is a hardware block diagram of a digital broadcast receiving apparatus according to an embodiment of the present invention. Hereinafter, the configuration of the digital broadcast receiving apparatus will be described with reference to FIG. Tuner 101 that receives the signal selected by the user, IF signal detection 102 that detects the presence or absence of the signal level, demodulator 103 that demodulates the modulated signal, and separates the demodulated signal into video, audio, and additional information TS decoder 104 for decoding, AV decoder 105 for decoding separated video signal / audio signal, flash ROM 106 for storing program and program information, RAM 107 for storing internal information of program, user-specific EEPROM 109 which is a storage device for storing information and system setting information of digital broadcast receiving device, infrared remote control signal transmitting device 110 for transmitting remote control signals to external devices, infrared remote control receiving device 111 for receiving remote control signals, LAN Use An Ether control device 112 for performing interactive services, an IEEE 1394 control device 113 for controlling external devices and transmitting / receiving data in conformity with the IEEE 1394 standard, and a CPU 108 for controlling these devices through the system bus 100 are included.

  Embodiment 1 of the present invention in the digital broadcast receiving apparatus having the above configuration will be described below with reference to the processing flow of FIG.

In step 21 in FIG. 2, the channel selection data of the channel to be scanned first is set in Tuner 101 in FIG. 1, and the process proceeds to step 22 in FIG. Next, in step 22 in FIG. 2, the presence or absence of the synchronization signal (TS synchronization) of the TS decoder 104 in FIG. 1 is detected. If there is no TS synchronization, the process proceeds to step 25 in FIG. 2 to scan the next channel. If there is TS synchronization, this channel is added to the channel list as a receivable channel in step 23 of FIG. 2, the channel list is stored in the EEPROM of FIG. 1, and the next channel is scanned to scan the next channel. The process proceeds to step 25. Next, in step 25 in FIG. 2, if the scanned channel is a channel with a lath, the process proceeds to step 26 in FIG. 2, and if the scanned channel is not a channel with a lath, in step 24 in FIG. Channel selection data of the next channel to be scanned is set in one Tuner 101, and the process proceeds to Step 22 in FIG. Next, in step 26 in the figure, the presence / absence of channels with overlapping channel selection operation information is checked from the channel list constructed at the time of scanning. If there is a channel with channel selection operation information overlapping, the process proceeds to step 27 in FIG. If there is no channel with the duplicated station operation information, the channel scan process ends. Next, in step 27 of FIG. 2, the channel selection data of the channel in which the channel selection operation information is duplicated is set in the tuner 101 of FIG. 1, and the process proceeds to step 28 of FIG. Next, in step 28 in FIG. 2, the presence or absence of the synchronization signal (TS synchronization) of the TS decoder 104 in FIG. 1 is detected. If there is TS synchronization, the process proceeds to step 29 in FIG. The transition to step 28 in FIG. 2 is repeated until there is TS synchronization. Next, in step 29 in FIG. 2, a predetermined time is waited for the received signal to stabilize. In step 290 in FIG. 2, the received signal quality is acquired and stored in the RAM 107 in FIG. In 291, the received signal qualities of the channels having the same channel selection operation information are compared. In step 292 in FIG. 2, the channel having the poor received signal quality is deleted from the channel list, and the channel list is stored in the EEPROM in FIG. 1. Then, the process proceeds to step 293 in FIG. Next, in step 293 in FIG. 2, if there is a channel with overlapping channel selection operation information, in step 294 in FIG. 2, channel selection data for the channel with the next channel selection operation information is set, and step 28 in FIG. If there is no channel in which the channel selection operation information overlaps, the channel scan process ends.

  Next, FIG. 3 shows a means for acquiring a receivable channel (step 301), a means for determining a channel with overlapping channel selection operation information (step 302), and a means for measuring the received signal quality of the overlapping channel (step 303). ), A step for each means is shown as means (step 304) for storing the channel whose reception signal quality is better to be compared.

  Although the channel list is stored in “EEPROM” in the first embodiment, “FlashROM” may be used.

  The first embodiment is not limited to a fixed receiver as a receiver, and the same applies to mobile receivers and partial receivers.

  The present invention is not limited to the embodiment described above.

  As described above, the function in the best mode for carrying out the present invention is realized by a predetermined program, and this is recorded on a recording medium such as an FD and transferred, so that it can be easily executed by another independent computer system. In the product, the program is written in a built-in memory, and can be operated by the user with a hard key or a remote controller of the receiving apparatus.

  According to the terrestrial digital broadcasting channel scan speed-up method of the present invention, in a region where different physical channels can be received in the same network, reception is performed by measuring the received signal quality of only the channels with overlapping channel selection operation information. Since the number of target channels waiting for signal quality measurement time is reduced, it has the effect of speeding up the scan, and is useful as a receiving device used for digital broadcasting.

Hardware block diagram of a digital broadcast receiver in an embodiment of the present invention The flowchart which shows the process of the digital broadcast receiver in Embodiment 1 of this invention. The flowchart which shows the process of the digital broadcast receiver in Embodiment 1 of this invention.

Explanation of symbols

100 system bus 101 tuner
102 IF signal detection 103 Demodulator 104 TSDecoder
105 AVDecoder
106 FlashROM
107 RAM
108 CPU
109 EEPROM
110 Infrared Remote Control Transmitter 111 Infrared Remote Control Receiver 112 Ether Controller 113 IEEE 1394 Controller

Claims (4)

In a digital broadcast receiving apparatus that performs channel scanning of terrestrial digital broadcasting and stores it in a channel list, means for scanning all frequencies of terrestrial digital broadcasting to obtain receivable channels, and means for determining channels with overlapping channel selection operation information And means for measuring the received signal quality of the channel only when there is a channel with overlapping channel selection operation information, and means for storing the better channel for comparing the received signal quality. Digital broadcast receiver. In a digital broadcast receiving method of performing channel scan of terrestrial digital broadcast and storing it in a channel list, a step of scanning all frequencies of terrestrial digital broadcast and acquiring receivable channels, and a step of determining channels where channel selection operation information overlaps And a step of measuring the received signal quality of the channel only when there is a channel with overlapping channel selection operation information, and a step of storing the better channel by comparing the received signal quality. Digital broadcast receiving method. Digital broadcast reception step of scanning digital terrestrial broadcast channel to computer and storing in channel list, step of acquiring all receivable channels by scanning all frequencies of digital terrestrial broadcast, and determining channel with overlapping channel selection operation information For measuring the received signal quality of the channel only when there is a channel with overlapping channel selection operation information, and storing the better channel by comparing the received signal quality A computer-readable recording medium on which is recorded. Digital broadcast receiving means for scanning a digital terrestrial broadcast channel and storing it in a channel list, means for acquiring all receivable channels by scanning all terrestrial digital broadcast frequencies, and means for determining a channel with overlapping channel selection operation information A program for functioning as a means for measuring the received signal quality of a channel only when there is a channel with overlapping channel selection operation information, and as a means for storing a better channel for comparing the received signal quality.

Images