JP2005318182A - Television broadcast receiver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a television receiver capable of easily detecting a channel through which a digital broadcast ground wave after passthrough is broadcast. <P>SOLUTION: This television receiver, which receives a broadcast radio wave of ground wave digital broadcasting broadcast in the UHF band through a passthrough device which outputs it by following passthrough to the VHF band or CATV band, is provided with: a 1st scanning means of deciding whether the broadcast radio wave is present in a channel selected in the VHF band and making a channel scan only in the VHF band when the broadcast radio wave is present or selecting a next channel when not; a 2nd scanning means of performing similar processes in the CATV band; a 3rd scanning means of performing similar processes in the UHF band; and a repeating means of repeating the processes by the 1st to the 3rd means one after another until a channel where the broadcast wave is present is detected. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a television broadcast receiver, in particular, a television that receives broadcast radio waves via a pass-through device that passes through and outputs broadcast radio waves of terrestrial digital broadcasts broadcast in the UHF band to the VHF band or CATV band. Concerning John receiver.

  In Patent Document 1, when a filter is set to a frequency corresponding to the third segment where the frequency fv of the analog broadcast radio wave is located, and the video carrier is detected, the channel is determined as an analog broadcast physical channel. On the other hand, there is described an automatic channel selection device that executes station detection for a digital broadcast wave in the physical channel when a video carrier wave is not detected.

  In Patent Document 2, an intermediate frequency signal is input to a detector, and the detector detects whether a received broadcast wave is an analog program or a digital program, and outputs the result to a CPU. Describes a receiver that controls to execute a demodulation scheme suitable for a received broadcast wave.

In Patent Document 3, when a channel scan is performed over the entire frequency band for terrestrial digital broadcasting and, as a result, one or more channels of terrestrial digital broadcasting are detected, the terrestrial analog method covers all frequencies. On the other hand, there is described a receiving apparatus that executes channel scan over all frequencies for gable wave analog broadcasting when channel scanning is performed and terrestrial digital broadcasting is not detected.
JP 2003-32562 A (page 8, FIG. 7) Japanese Unexamined Patent Publication No. 2003-46883 (page 3, FIG. 1) JP 2003-219289 A (6th page, FIG. 2)

  By the way, in terrestrial digital broadcasting, since the frequency band to be broadcast differs depending on the region, channel scanning is necessary. The frequency band over which terrestrial digital broadcasting is broadcast is generally UHF (UHF13 to UHF63). However, in a hearing facility such as an apartment or a difficult viewing area, a broadcast wave received in the UHF band is transmitted by VHF or CATV. There is a case where a broadcast wave is provided to each household by passing through the road. At that time, since the user does not know in which band the broadcast wave is flowing, in the worst case, it is necessary to perform a channel scan over all channels for all transmission paths of UHF, VHF, and CATV. There is a problem that it takes a very long time to find a channel on which terrestrial digital broadcasting is flowing. None of the above-mentioned Patent Documents 1 to 3 describes a problem when the terrestrial digital broadcast is passed through. In the receiver described in Patent Document 3, after a transmission path of a terrestrial wave or a cable wave is specified for a digital broadcast wave, an analog broadcast channel scan is executed on the transmission path in which the broadcast wave is flowing. However, for digital broadcast waves, channel scanning is performed over all channels.

  An object of the present invention is to provide a television receiver capable of easily detecting a channel through which a pass-through digital terrestrial broadcast wave flows.

The television receiver according to the first aspect of the present invention is provided via a pass-through device that passes through and outputs a broadcast wave of terrestrial digital broadcasting broadcast in the UHF band to the VHF band or the CATV band.
A television receiver for receiving the broadcast radio wave, wherein it is determined whether the broadcast radio wave is present in a channel selected in the VHF band, and if the broadcast radio wave is present, the channel is only in the VHF band. Performing a scan, and determining whether the broadcast radio wave exists in the channel selected in the CATV band, and a first scan means for selecting the next channel if the broadcast radio wave does not exist, If there is a broadcast radio wave, a channel scan of only the CATV band is executed, and if there is no broadcast radio wave, a second scan means for selecting the next channel, and the broadcast to the channel selected in the UHF band. It is determined whether or not a radio wave exists, and if the broadcast radio wave exists, a channel scan of only the UHF band is executed, and the broadcast radio wave exists. If a third scanning means for tuning the next channel,
Repeating means for sequentially repeating the processing by the first to third scanning means until a channel in which the broadcast wave exists is detected.

  According to this receiver, when the terrestrial digital broadcast is received by being passed through to the VHF band, the CATV band, or the UHF band, the number of channel scans required for detecting the channel in which the terrestrial digital broadcast exists can be reduced. As a result, the time required for channel scanning can be shortened.

  A television receiver according to a second aspect of the present invention is a television that receives a broadcast wave of a terrestrial digital broadcast broadcast in the UHF band via a pass-through device that outputs the broadcast wave of the terrestrial digital broadcast to the VHF band or the CATV band. A receiver that determines whether the broadcast radio wave is present in a channel selected in the VHF band, and if the broadcast radio wave is present, performs a channel scan of only the VHF band, If there is no radio wave, first scanning means for selecting the next channel, and determining whether the broadcast radio wave is present in the channel selected in the CATV band, and if the broadcast radio wave is present, A second scan means for performing a channel scan of only the CATV band and selecting the next channel if the broadcast radio wave is not present; and the broadcast wave Until it detects a channel that is present, characterized in that it comprises sequentially, a repeating unit repeating the processing by said first and second scanning means.

  According to this receiver, when the terrestrial digital broadcast is received by being passed through to the VHF band or the CATV band, the number of channel scans required for detecting the channel in which the terrestrial digital broadcast exists can be reduced. The time required for scanning can be shortened.

  A television receiver according to a third invention is the television receiver according to the second invention, wherein it is determined whether or not the broadcast radio wave is present in a channel selected in the UHF band, and the broadcast radio wave exists. If there is no broadcast radio wave, the third scan means for performing the channel scan only for the UHF band and selecting the next channel is further provided. The processing by the first to third scanning means is sequentially repeated until detection.

  According to this receiver, when the terrestrial digital broadcast is further passed through to the UHF band and received, the number of channel scans required for detecting a channel in which the terrestrial digital broadcast exists can be reduced.

(1) First Embodiment [Configuration]
FIG. 1 is a schematic configuration diagram of a television receiver 1 according to an embodiment of the present invention.

The television receiver 1 includes a tuner unit 2, a decoder 3, a D / A unit 4, a CPU 5, a RAM 6, a ROM 7, and a channel map memory 8. The tuner unit 2 receives a broadcast wave having a frequency set by the CPU 5. The decoder 3 demodulates the broadcast signal output from the tuner unit 2. The D / A unit 4 converts the demodulated signal into an analog signal and outputs it to a monitor or the like. The CPU 5 controls each unit such as the tuner unit 2 and the decoder 3. The D / A unit 4 converts a digital signal into an analog signal. The RAM 6 stores data necessary for the operation of the CPU 5, processing results, and the like. The ROM 7 stores programs executed by the CPU 5 and data necessary for various settings. As a result of the channel scan, the channel map memory 8 records the channel number of the channel in which the broadcast wave exists, the name of the broadcaster transmitting the broadcast wave, and the like in association with each other.

  The input terminal of the television receiver 1 is electrically connected to the pass-through device 9 and receives broadcast waves via the VHF band, CATV band, and VHF band transmission paths. The pass-through device is installed in a hearing facility such as an apartment or a condominium, a difficult-to-view facility, a CATV provider, and the like, and switches a transmission path through which a broadcast wave flows. The device 9 according to the present embodiment receives a terrestrial digital broadcast wave broadcast in the UHF band and switches to the VHF band. Here, a case where the terrestrial digital broadcast wave is switched from the UHF band to the VHF band will be described. However, the terrestrial digital broadcast wave flowing through any one or more transmission paths is any of the VHF band, the CATV band, and the UHF band. In the case of passing through one transmission line, the present embodiment is similarly applied. The case of being passed through to a plurality of transmission lines will be described in the second embodiment.

[Channel scan of terrestrial digital broadcasting]
FIG. 2 is a flowchart of channel scanning executed by the television receiver 1 of the present embodiment. The processing in FIG. 2 is executed by channel scan software executed in the CPU 5.

  Here, digital terrestrial broadcasting that flows through the UHF band (UHF13 to 63) is passed through to any of the transmission paths of the VHF band (VHF1 to 12), CATV band (CATV13 to 63), and UHF band (UHF13 to 63). It will be described as possible.

In S20, the channel x of the VHF band is initialized to 1, the channel y of the CATV band is set to 13, and the channel z of the UHF band is initialized to 13. In S21, it is determined whether or not a terrestrial digital broadcast wave is flowing through the channel x in the VHF band. If a terrestrial digital broadcast wave is flowing through the channel x, it is determined that the terrestrial digital broadcast has been passed through to the VHF band, the current channel x is recorded in the channel map memory, and the process proceeds to S28, where VHF Scan the remaining channels with only the band. On the other hand, when the terrestrial digital broadcast wave is not flowing in the channel x in S21, the process proceeds to S22 and the channel x is set as the next channel. Next, in S23, it is determined whether or not a terrestrial digital broadcast wave is flowing in the channel y of the CATV band. If a terrestrial digital broadcast wave is flowing in the channel y, the terrestrial digital broadcast is passed through to the CATV band. The current channel y is recorded in the channel map memory, the process proceeds to S29, and the remaining channels are scanned only in the CATV band. On the other hand, when the terrestrial digital broadcast wave is not flowing in the channel y in S23, the process proceeds to S24 and the channel y is set as the next channel. Next, in S25, it is determined whether or not a terrestrial digital broadcast wave is flowing in the channel z of the UHF band. If a terrestrial digital broadcast wave is flowing in the channel z, it is determined that the terrestrial digital broadcast wave is passed through to the UHF band, the current channel z is recorded in the channel map memory, and the process proceeds to S30. The remaining channels are scanned only in the UHF band. On the other hand, if the terrestrial digital broadcast wave is not flowing in the channel z in S25, the channel z is set to the next channel in S26. In step S26, it is determined whether z = 64, that is, whether the UHF band last channel 63 has been scanned. If the last channel has been scanned, the channel scanning process is terminated. On the other hand, if the UHF band last channel has not been scanned, the process proceeds to S27, where it is determined whether or not the VHF band last channel has been completed. If all the VHF band channels have been scanned, S23 is performed. , The CATV band and the UHF band are continuously scanned. If all the channels in the VHF band have not been scanned yet, the process returns to S21 to return to the VHF band, CATV band, UHF.
Continue to scan the band.

  FIG. 3 is a flowchart of the process in S28. In S31, the next channel x + 1 is set to the initial value of channel xx. In S32, it is determined whether or not terrestrial digital broadcasting is flowing in the channel xx. If it is flowing, the current xx is recorded in the channel map in S33, and the process proceeds to S34. On the other hand, if terrestrial digital broadcasting is not flowing in the channel xx, the process proceeds to S34 as it is. In S34, the channel xx is set as the next channel, and in S35, it is determined whether or not the channel xx is 14 and all the channels in the VHF band have been scanned. If all channels have been scanned, the channel scan is terminated. If all channels have not been scanned, the process returns to S32 and the channel scan is repeated.

  FIG. 4 is a flowchart of the process in S29. In S41, the next channel y + 1 is set to the initial value of the channel yy. In S42, it is determined whether or not a terrestrial digital broadcast wave is flowing in the channel yy. If it is flowing, the current yy is recorded in the channel map in S43, and the process proceeds to S44. On the other hand, if the terrestrial digital broadcast wave is not flowing through the channel yy, the process proceeds to S44 as it is. In S44, channel yy is set to the next channel, and in S45, it is determined whether all channels in the CATV band have been scanned. If all channels have been scanned, the channel scan is terminated and all channels have been scanned. Otherwise, return to S42 and repeat the channel scan.

  FIG. 5 is a flowchart of the process in S30. In S51, the next channel z + 1 is set to the initial value of the channel zz. In S52, it is determined whether or not a terrestrial digital broadcast wave is flowing in the channel zz. If it is flowing, the current zz is recorded in the channel map in S53, and the process proceeds to S54. On the other hand, if the terrestrial digital broadcast wave is not flowing through the channel zz, the process proceeds to S54 as it is. In S54, the channel zz is set to the next channel, and in S55, it is determined whether or not all channels in the UHF band have been scanned. If all channels have been scanned, the channel scan is completed and all channels have been scanned. Otherwise, the process returns to S52 and the channel scan is repeated.

[Function and effect]
In the present embodiment, the channels of the transmission paths of the VHF band, CATV band, and UHF band are scanned one by one, and when the channel in which the terrestrial digital broadcast wave flows is found, only the transmission path of that channel, Since the channels are scanned, the number of channel scans can be reduced and the processing time required for the channel scans can be shortened as compared with the case where all channels are scanned for each transmission path. In particular, when receiving a terrestrial digital broadcast wave passed through by a hearing facility, a difficult viewing facility, a CATV provider, etc., it is possible to quickly detect the transmission path and the channel in the transmission path, The number of channel scans can be reduced and the processing time required for the channel scan can be shortened.

(2) Second Embodiment In the first embodiment, the case where the signal is passed through to one transmission line has been described. However, when the signal is passed through to two transmission lines, the process shown in FIG. The same effect as the case can be obtained.

FIG. 6 is a flowchart of channel scanning executed by the television receiver 1 of the second embodiment. In FIG. 6, when scanning of all channels for any transmission path is completed in each step of S28, S29, and S30, the channel scan is not terminated, that is, the terrestrial digital signal is not transmitted in any transmission path. The processing is not terminated when the broadcast wave is detected, but the channel scan is continued for the remaining other transmission paths. That is, after discovering one transmission path through which terrestrial digital broadcast waves flow, an attempt is made to discover another transmission path through which terrestrial digital broadcast waves flow.

  When the processes of S28, S29, and S30 are completed, the flag 1 indicating the end of the VHF band scan, the flag 2 indicating the end of the CATV band scan, and the flag 3 indicating the end of the UHF band scan are respectively turned on. In S61, it is determined whether or not the UHF band scan has ended with reference to the flag 3, and if it has ended (flag 3 is on), S25 to S26 corresponding to the UHF band processing are omitted. To do. In S62, it is determined whether or not the scan of the VHF band has ended with reference to the flag 1, and if it has ended (flag 1 is on), S21 to S22 corresponding to the processing in the VHF band are executed. Without proceeding to S63. In S63, it is determined whether or not the CATV band scan has ended with reference to the flag 2, and if it has ended (flag 2 is on), S23 to S24 corresponding to the CATV band processing are omitted. In S64, it is determined whether or not two of the flags 1 to 3 are turned on. If the two flags are turned on, the process is terminated.

  According to the processing of FIG. 6, even when the terrestrial digital broadcast wave is passed through to two or more transmission paths, the channel through which the terrestrial digital broadcast wave flows is sequentially detected from the transmission path. Since the channel scan of the transmission path is completed and the processing is terminated when two transmission paths are found, the channel scan is compared with the case of scanning all the channels of each transmission path for all three transmission paths. The number of times can be reduced, and the processing time required for channel scanning can be shortened.

  Here, the case where all the transmission lines are three is illustrated as being passed through to two transmission lines. However, when all the transmission lines are four or more, the number of transmission lines is less than the number of all transmission lines. In such a situation, the number of channel scans can be reduced, and the processing time required for the channel scan can be shortened.

1 is a schematic configuration diagram of a television receiver. The flowchart of the channel scan which concerns on 1st Embodiment. The remaining processing in the VHF band. The remaining processing in the CATV band. The remaining processing in the UHF band. The flowchart of the channel scan which concerns on 2nd Embodiment.

Explanation of symbols

1 Television Receiver 2 Tuner 3 Decoder 4 D / A 5 CPU
6 RAM
7 ROM
8 Channel map memory 9 Pass-through device

Claims (3)

A television receiver that receives a broadcast wave of a terrestrial digital broadcast broadcast in the UHF band through a pass-through device that outputs the broadcast wave of the terrestrial digital broadcast to the VHF band or the CATV band,
It is determined whether or not the broadcast radio wave exists in the channel selected in the VHF band. If the broadcast radio wave exists, a channel scan of only the VHF band is executed. First scanning means for selecting a channel of;
It is determined whether or not the broadcast radio wave is present in a channel selected in the CATV band. If the broadcast radio wave is present, a channel scan of only the CATV band is executed. A second scanning means for selecting a channel of;
It is determined whether or not the broadcast radio wave exists in the channel selected in the UHF band. If the broadcast radio wave exists, a channel scan of only the UHF band is executed. A third scanning means for selecting a channel of;
Repeating means for sequentially repeating the processing by the first to third scanning means until a channel in which the broadcast wave exists is detected;
A television receiver comprising: A television receiver that receives a broadcast wave of a terrestrial digital broadcast broadcast in the UHF band through a pass-through device that outputs the broadcast wave of the terrestrial digital broadcast to the VHF band or the CATV band,
It is determined whether or not the broadcast radio wave exists in the channel selected in the VHF band. If the broadcast radio wave exists, a channel scan of only the VHF band is executed. First scanning means for selecting a channel of;
It is determined whether or not the broadcast radio wave is present in a channel selected in the CATV band. If the broadcast radio wave is present, a channel scan of only the CATV band is executed. A second scanning means for selecting a channel of;
Repeating means for sequentially repeating the processing by the first and second scanning means until a channel in which the broadcast wave exists is detected;
A television receiver comprising: It is determined whether or not the broadcast radio wave exists in the channel selected in the UHF band. If the broadcast radio wave exists, a channel scan of only the UHF band is executed. Further comprising third scanning means for selecting a channel of
3. The television receiver according to claim 2, wherein the repeating unit sequentially repeats the processing by the first to third scanning units until a channel in which the broadcast wave exists is detected.

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