JP2007336408A - Terrestrial digital broadcast receiver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate registration of a preset table in a digital receiver. <P>SOLUTION: There are provided: a transmission spot table indicating correspondence between a transmission spot identifier indicating a transmission spot of digital broadcast and a broadcast area wherein the transmission spot indicated by the transmission spot identifier takes charge of transmission; a channel table indicating correspondence between a broadcast area and a channel receivable in the broadcast area; and a control circuit 30. When an information signal is received while a frequency band of digital broadcast is scanned, the control circuit 30 extracts a transmission spot identifier from the received information signal. By referring to the transmission spot table, a corresponding broadcast area is discriminated from the extracted transmission spot identifier. By referring to the channel table, data of a channel receivable in the broadcast area of a discrimination result are registered in the preset table and scanning is stopped thereafter. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a receiver for digital terrestrial broadcasting.

  Digital terrestrial television broadcasting receivers are provided with channel preset channel selection and channel up / down functions. In the preset channel selection function, when one of the numeric keys provided in the transmitter of the remote controller (remote operation) is pressed, a channel preset in the pressed key is selected. The channel up / down function is such that preset channels are sequentially selected when a channel up key or a channel down key is pressed.

  In order to realize these functions, a stationary terrestrial digital television broadcast receiver is prompted to input information indicating the place of use, such as a postal code, when the receiver is installed. When the user inputs information indicating the place of use, channels that can be received in the area of the place of use are automatically registered in the preset memory.

  Therefore, the preset channel selection function and the channel up / down function can be used thereafter. In addition, the program guide can be displayed by combining with program information.

For example, there are the following prior art documents.
JP 2004-343235 A

  By the way, a receiver mounted on a mobile body such as an automobile, or a receiver built in a so-called laptop computer or mobile phone, that is, a mobile receiver does not have a fixed place to use it. For this reason, in order to be able to use the preset channel selection function and the channel up / down function in the mobile receiver, it is necessary to input information indicating the use place of the receiver every time the mobile receiver moves. However, this is not easy to use.

  Therefore, it is conceivable that a scan key is provided, and when this scan key is pressed, the frequency band of digital television broadcasting is scanned, and the broadcast channel is sequentially registered in the preset memory. It is also conceivable to detect the position of the receiver using GPS or the like and register in the memory a channel that can be received at the location indicated by the detected position information.

  However, in the case of using the scan key, it is necessary for the user to operate the scan key for each moving place, or it is necessary to operate the scan key after moving to a place where broadcasting can be received, which is inconvenient. It becomes a thing.

  Further, when presetting is performed by scanning all channels, it takes two to three minutes, which is also unusable. However, if all the past scan results are stored, a large memory capacity is required.

  Furthermore, since the broadcast area is not a simple shape, in the case of using GPS, the configuration and processing for determining which broadcast area includes the latitude and longitude indicated by the GPS are complicated. Absent.

  In addition, it is conceivable to use network identification, transport stream identification, or service identification included in broadcasting, but in the case of transmission via relay, it is often impossible to specify the actual broadcasting area. After all, it is not realistic.

  The present invention is intended to solve the above problems.

In this invention,
A receiving circuit that receives terrestrial digital broadcasting and outputs a video signal, a sound signal of a predetermined channel, and an information signal of information relating to the channel being received;
Numeric keys and
A preset table in which channel data for selecting a channel of the terrestrial digital broadcast supplied to the receiving circuit is registered;
A transmitting station table indicating the correspondence between the transmitting station identifier indicating the transmitting station of the terrestrial digital broadcasting and the broadcasting area in which the transmitting station indicated by the transmitting station identifier is responsible for transmission;
A channel table showing the correspondence between the broadcast area and the receivable channels in the broadcast area;
Control circuit,
The control circuit is
Perform a scan of the above digital terrestrial broadcast frequency band,
When the information signal is received during the scan, the transmitting station identifier is extracted from the received information signal,
By referring to the transmitting station table, from the extracted transmitting station identifier, the transmitting station indicated by the transmitting station identifier determines the broadcast area responsible for transmission,
By referring to the channel table, the channel data for selecting a receivable channel in the broadcast area of the determination result is registered in the preset table, and the preset table is updated.
When this update is finished, stop the scan,
When the numeric key is pressed after the scan is stopped, channel data corresponding to the pressed numeric key is extracted from the channel data registered in the preset table,
The extracted channel data is set as a receiver for digital terrestrial broadcasting in which the receiving circuit is set.

  According to the present invention, since the broadcasting area is specified by receiving the transmitting station identifier, the actual broadcasting area can be specified reliably. Further, since the transmitting station identifier can be obtained from the transport stream received first after the scan is started, the time required for the preset can be greatly shortened.

[1] Information signal and terminology transmitted In digital terrestrial television broadcasting, various information signals are transmitted in addition to the original video signal, audio signal or data signal. There is “Transmitter identifier (Transmitter_ID)”. This transmitting station identifier is an identification code for identifying the transmitting station, and is assigned a unique value nationwide.

  In the present invention, the transmitting station identifier is received, the current broadcasting area is determined from the transmitting station identifier, and the preset is executed from the determination result.

[2] Configuration FIG. 1 shows an example of a receiver for digital terrestrial television broadcasting to which the present invention is applied. Reference numeral 10 denotes a receiving circuit thereof. That is, a broadcast wave of digital terrestrial television broadcasting is received by an antenna 11, and the received signal is supplied to a tuner circuit 12 configured in a synthesizer system, and a received signal including a target channel (service) is converted into an intermediate frequency signal. Is done.

  Then, this intermediate frequency signal is supplied to the demodulation circuit 14 through the intermediate frequency circuit 13, and the transport stream in the MPEG2 format is demodulated and extracted. This transport stream is supplied to the TS decoder circuit 15 for the target channel. Video and audio data streams are selected and decoded and retrieved.

  Then, the extracted video data stream is decoded into the original digital video signal supplied to the video decoder circuit 16, and this digital video signal is passed through the OSD circuit 17 to digital input display means such as an LCD panel 18. The video of the target channel is displayed.

  The OSD circuit 17 controls the supply of the video signal supplied from the video decoder circuit 16 to the LCD panel 18 in accordance with a control signal from the system control circuit 30 described later. Further, the OSD circuit 17 forms a digital video signal for displaying predetermined characters (including numbers and symbols) according to display data from the system control circuit 30 and supplies the digital video signal to the LCD panel 18. is there.

  Further, the audio data stream extracted from the TS decoder circuit 15 is decoded into an original digital audio signal supplied to the audio decoder circuit 21 and D / A converted into an analog signal. The sound corresponding to the video displayed on the LCD panel 18 is output from the speaker 22.

  Further, an information signal including the above-mentioned transmitting station identifier is taken out from the TS decoder circuit 15, and this information signal is supplied to the system control circuit 30, and a status signal is sent from the demodulation circuit 14 and the TS decoder circuit 15 to the system control circuit 30. Is supplied. Further, a channel selection signal is supplied from the system control circuit 30 to the tuner circuit 12 and a control signal is supplied to the TS decoder circuit 15.

  In this case, the system control circuit 30 controls the reception channel of the reception circuit 10 and the display on the LCD panel 18. For this reason, the control circuit 30 is constituted by a microcomputer, and includes a CPU 31, a ROM 32 in which various programs are written, a work area RAM 33, and a nonvolatile memory 34.

  The system control circuit 30 is connected to various operation keys 41 and a receiver 42 of a remote controller (remote operation). The receiving unit 42 is paired with a remote controller transmitter 50, and the transmitter 50 and the receiving unit 42 realize a remote controller using, for example, infrared rays. The transmitter 50 includes numeric keys 51 of “1” to “10” and a next key 52N and a previous key 52P for realizing a channel up / down function as part of the operation keys. Note that the numeric key 51 is also a preset key for realizing a preset channel selection function, as will be described later.

  Further, in the ROM 32 of the system control circuit 30, for example, a routine 100 as shown in FIG. 2 is prepared as a part of the program. This routine 100 is for registering data for preset channel selection, and details thereof will be described later. In FIG. 2, the routine 100 shows only the portions related to the present invention.

  Further, the ROM 32 of the system control circuit 30 is provided with a transmitting station table TXTBL and a channel table CHTBL as shown in FIGS. 3 and 4, for example. In this case, the transmitting station table TXTBL is a correspondence table between a transmitting station identifier and a broadcasting area in which the transmitting station indicated by the transmitting station identifier is in charge of broadcasting.

  The channel table CHTBL is a correspondence table between a broadcast area and channel data DCH necessary for receiving a channel broadcast in the broadcast area. Here, the channel data DCH is supplied to the tuner circuit 12 as a channel selection signal and data for selecting a received signal including a target channel, and is supplied to the TS decoder circuit 15 as a control signal and is used as a target channel. And data for selecting a video and audio data stream.

  Furthermore, a preset table PTBL as shown in FIG. 5 is prepared in the memory 34 of the system control circuit 30. This preset table PTBL is for realizing channel selection by the preset channel selection function.

  In other words, in the example of FIG. 5, the preset table PTBL includes channel data DCH, station name data, and channel number data as one set, and this set of data is assigned to each numeric key 51 of the remote control transmitter 50. ("1" to "10" keys). Here, the channel data DCH is as described above, the station name data is data for displaying a television station name or the like on the LCD panel 18, and the channel number data is for displaying a channel number on the LCD panel 18. It is data of.

[3] Operation [3-1] Automatic preset When an arbitrary channel is received and the receiver moves out of the broadcast area, the channel cannot be received. Is notified to the system control circuit 30. Then, in the system control circuit 30, the processing of the CPU 31 starts from step 101 of the routine 100. Next, in step 102, the loop counter i is set to “1”, and in step 103, the system waits for a predetermined period. Is called.

  Subsequently, in step 104, it is determined whether or not the broadcast can be received by checking the status signal from the demodulation circuit 14. When the broadcast cannot be received, the process proceeds from step 104 to step 105. In step 105, the loop counter i is incremented by “1”. Thereafter, in step 106, whether the counter i is 4 or more, for example. Is determined, and when it is not 4 or more, the process returns from step 106 to step 103. In this way, the time waiting in step 103 and the confirmation of the broadcast reception in step 105 are repeated.

  If the broadcast can be received in step 105, the process proceeds from step 105 to step 107, and the routine 100 is terminated by this step 107. Therefore, if the receiver cannot temporarily receive the broadcast due to the car moving in a tunnel or behind a building, nothing will be executed for the preset, and it has not been received until then. Reception of the selected channel is continued.

  However, when the receiver moves out of the broadcast area, the broadcast cannot be received, and the number of repetitions of steps 103 to 106 exceeds the upper limit, which is 4 in the case of FIG. 2, so this is determined by step 106 and processed. Advances from step 106 to step 111.

  In step 111, the reception channel of the tuner circuit 12 is set to the lowest channel in the digital terrestrial television broadcasting by the channel selection signal from the system control circuit 30, and in step 112, the status signal from the demodulation circuit 14 is set. By checking, it is determined whether or not the broadcast can be received on the reception channel set at this time.

  If the broadcast cannot be received, the process proceeds from step 112 to step 113, where it is determined whether or not the channel set at this time in the tuner circuit 12 is the highest channel, and is not the highest channel. Sometimes, the process proceeds from step 113 to step 114, and the tuner circuit 12 is set to a reception channel that is one channel higher than the reception channel set at this time, and then the process returns to step 111.

  Accordingly, since steps 111 to 114 are repeated thereafter, the presence / absence of broadcasting is checked one by one from the lowest channel with respect to the frequency band of terrestrial digital television broadcasting, that is, scanned. become.

  If a broadcast can be received on a certain channel during this scan, this is determined in step 112, and the process proceeds from step 112 to step 121. In step 121, the transmitting station identifier is extracted from the received transport stream information signal. In step 122, the transmitting station identifier extracted in step 121 is obtained by referring to the transmitting station table TXTBL. , Converted into data indicating the corresponding broadcast area.

  Subsequently, in step 123, channel data DCH that can be received in the broadcast area of the conversion result in step 122 is extracted from the channel table CHTBL, and the extracted channel data DCH is transferred to the preset table PTBL. Accordingly, the preset table PTBL is updated in steps 121 to 123. At this time, the preset table PTBL is updated with the channel data DCH of the broadcast area where the broadcast can actually be received.

  Thereafter, in step 124, the first channel data DCH is extracted from the channel data of the preset table PTBL, and the extracted channel data DCH is supplied to the tuner circuit 12 and the TS decoder circuit 15.

  As a result, the tuner circuit 12 starts receiving the first channel registered in the preset table PTBL, and the TS decoder circuit 15 selects and decodes the video and audio data streams of the first channel. . Accordingly, the digital video signal of the head channel is taken out from the video decoder circuit 16, and this digital video signal is supplied to the LCD panel 18 through the OSD circuit 17, so that the LCD panel 18 is preset at the head of the preset table PTBL. The video of the current channel is displayed.

  The audio decoder circuit 21 outputs an analog audio signal of the first channel, and this audio signal is supplied to the speaker 22. Therefore, audio corresponding to the video at this time is output from the speaker 22.

  Next, in step 125, all the station name data and channel number data registered in the preset table PTBL are extracted, and the extracted data is supplied to the OSD circuit 17 as display data. As a result, in the OSD circuit 17, a predetermined digital video signal corresponding to the display data is formed and supplied to the LCD panel 18. For example, as shown in FIG. The name list 18L is displayed. At this time, in the station name list 18L, the cursor 18C is displayed as an index, for example, in an inverted display at the display position of the head station name and channel number.

  When a predetermined short time has elapsed, the display of the channel list 18L is erased and only the video of the channel selected at step 124 is displayed, and then the routine 100 is ended at step 126.

  In step 113, when the channel set in the tuner circuit 12 is the highest channel, the process proceeds from step 113 to step 115. In this step 115, predetermined display data is supplied to the OSD circuit 17 and the LCD panel is displayed. A text indicating that the update of the preset has failed is displayed at 18, and then the routine 100 is terminated at step 126.

  Thus, according to the routine 100, the broadcasting area is determined using the transmitting station identifier, and the channel data DCH of the determined broadcasting area is automatically registered in the preset table PTBL. In this case, the transmitting station identifier is assigned a unique value nationwide, and the broadcasting area is specified from the transmitting station identifier that can be actually received.

  In addition, the transmitting station identifier can be obtained from the transport stream received first in the repetition of steps 112 to 114, so that it is possible to know the broadcast area. The required time can be greatly reduced. For example, when presetting is performed by scanning all the channels, the presetting can be performed in several tens of seconds or less as compared with the case where 2-3 minutes are required as described above.

  Furthermore, it is possible to always select only the channels that can be received at the destination regardless of where it moves, and the channel list 18L becomes easy to see. Also, scanning for presetting can be started automatically, which is easy to use. Further, since the channel table CHTBL and the preset table PTBL are necessary even when the receiving location is designated from the postal code or the like, the transmitting station table TXTBL and the routine 100 are used when the above receiver is realized. It is only necessary to provide a new one, which is simple and can suppress an increase in cost.

[3-2] Channel Selection by Preset Tuning Function In this case, of the numeric keys 51 of the remote control transmitter 50, the numeric key in which the target channel is preset is pressed.

  That is, of the numeric keys 51, for example, when the “3” key is pressed, this is transmitted from the transmitter 50 to the receiving unit 42 by infrared rays, and the system control circuit 30 is notified that the “3” key has been pressed. Then, in the system control circuit 30, the channel data DCH3 is extracted from the “3” key set in the preset table PTBL, and the extracted channel data DCH3 is supplied to the tuner circuit 12 and the TS decoder circuit 15. .

  Therefore, the image of the channel preset to the “3” key is displayed on the LCD panel 18. The speaker 22 outputs the sound of the channel preset to the “3” key.

  Further, at this time, the station name data “XX TV” is extracted from the set of “3” keys in the preset table PTBL, and the channel number data “* 4 *” is extracted, and these data are sent to the OSD circuit 17. Supplied as display data. As a result, the OSD circuit 17 forms a predetermined digital video signal corresponding to the display data, and this video signal is supplied to the LCD panel 18. As a result, the TV station name “XX TV” and the channel number “* 4 *” of the channel preset in the “3” key are displayed on the LCD panel 18 over a predetermined period while being superimposed on the broadcast video. The

  Thus, when any one of the numeric keys 51 “1” to “10” is pressed, a channel preset to the pressed key is selected, and the channel can be received.

[3-3] Channel Selection by Channel Up / Down Function In this case, when an arbitrary channel is selected from the channels preset in the preset table PTBL, the next key of the remote control transmitter 50 is received. 52N or the previous key 52P is pressed.

  Then, the press of the next key 52N or the previous key 52P is notified to the system control circuit 30 in the same manner as in [3-2], and the channel data currently being received out of the channel data of the preset table PTBL. The channel data DCH of the next or previous channel is extracted, and the extracted channel data DCH is supplied to the tuner circuit 12 and the TS decoder circuit 15. As a result, in the same manner as in [3-2], selection of the next or previous channel of the channel currently being received is started.

  At this time, all the station name data and channel number data registered in the preset table PTBL are extracted, and the extracted data is supplied to the OSD circuit 17 as display data. As a result, in the OSD circuit 17, a predetermined digital video signal corresponding to the display data is formed and supplied to the LCD panel 18. For example, as shown in FIG. 6, the station name and its channel number are displayed in the station name list. 18L is displayed.

  Further, in this station name list 18L, the display position of the station name and channel number of the channel next to or previous to the channel currently being received, in the case of FIG. 6, the display positions of "XX TV" and "1 **" The cursor 18C is displayed as an index.

  When a predetermined short period of time elapses after video and audio of the channel next to or currently being received can be obtained, the OSD circuit 17 is controlled, and the station name list 18L shown in FIG. 6 is displayed. Disappear.

  Therefore, each time the next key 52N or the previous key 52P is pressed, the next channel or the previous channel is selected, and the video and audio of the channel where the next key 52N or the previous key 52P is finally pressed can be viewed. become.

[4] Summary According to the above-mentioned television receiver, paying attention to the fact that the transmitting station identifier is assigned a unique value nationwide, the broadcasting area is determined using the transmitting station identifier, and this determined broadcasting is determined. Since the channel data DCH of the area is registered in the preset table PTBL, that is, the broadcast area is specified from the transmitting station identifier that can be actually received, the broadcast area can be specified reliably.

  In addition, the transmitting station identifier can be obtained from the transport stream received first after the scan is started, so that the broadcast area can be known, so that it is not necessary to perform the subsequent scan and is necessary for the preset. Time can be greatly reduced.

  Furthermore, it is possible to always select only the channels that can be received at the destination regardless of where it moves, and the channel list 18L becomes easy to see. Also, scanning for presetting can be started automatically, which is easy to use. Furthermore, there is no need to detect the position of the receiver using GPS or to determine which broadcast area the reception position is included in based on the detection result, so that the configuration and processing are not complicated. .

[5] Others For example, in the case of a receiver in a car audio device, when playing a cassette or CD, or when watching a television broadcast like when using a navigation device, The routine 100 can always be automatically executed behind the scenes.

  Further, in the routine 100, when moving from step 106 to step 111, the transmitting station identifier so far is temporarily saved, and when the transmitting station identifier is acquired in step 121, the acquired transmitting station identifier is saved. The transmitting station identifier may be compared with each other, and step 122 and subsequent steps may be executed only when they are different.

  Furthermore, after displaying that the update of the preset has failed in step 114, the user may wait for an instruction, and when the user instructs an update again, the process from step 111 onward may be repeated. Alternatively, the scan may be automatically repeated without requesting the user's instruction, and the scan may be repeated until the number of repetitions and the total repetition time become a preset value.

  Further, when the user presses the scan key of the operation keys 41, for example, step 111 and subsequent steps of the routine 100 can be executed. In this case, the preset table PTBL can be forcibly updated with one touch. . Furthermore, the present invention can also be applied to a terrestrial digital audio broadcast receiver.

[List of abbreviations]
CD: Compact Disc
CPU: Central Processing Unit
D / A: Digital to Analog
GPS: Global Positioning System
LCD: Liquid Crystal Display
MPEG: Motion Picture Experts Group
MPEG2: MPEG Phase 2
OSD: On Screen Display
RAM: Random Access Memory
ROM: Read Only Memory
TS: Transport Stream
Remote control: Remote Control

It is a systematic diagram showing one embodiment of the present invention. It is a flowchart which shows one form of this invention. It is a figure of the data table which can be used for this invention. It is a figure of the data table which can be used for this invention. It is a figure of the data table which can be used for this invention. It is a figure which shows the example of a display.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Reception circuit, 30 ... System control circuit, 31 ... CPU, 34 ... Non-volatile memory, 41 ... Operation key, 42 ... Remote control receiver, 50 ... Remote control transmitter, 51 ... Number key, 100 ... Routine

Claims (3)

A receiving circuit that receives terrestrial digital broadcasting and outputs a video signal, a sound signal of a predetermined channel, and an information signal of information relating to the channel being received;
Numeric keys and
A preset table in which channel data for selecting a channel of the terrestrial digital broadcast supplied to the receiving circuit is registered;
A transmitting station table indicating the correspondence between the transmitting station identifier indicating the transmitting station of the terrestrial digital broadcasting and the broadcasting area in which the transmitting station indicated by the transmitting station identifier is responsible for transmission;
A channel table showing the correspondence between the broadcast area and the receivable channels in the broadcast area;
Control circuit,
The control circuit is
Perform a scan of the above digital terrestrial broadcast frequency band,
When the information signal is received during the scan, the transmitting station identifier is extracted from the received information signal,
By referring to the transmitting station table, from the extracted transmitting station identifier, the transmitting station indicated by the transmitting station identifier determines the broadcast area responsible for transmission,
By referring to the channel table, the channel data for selecting a receivable channel in the broadcast area of the determination result is registered in the preset table, and the preset table is updated.
When this update is finished, stop the scan,
When the numeric key is pressed after the scan is stopped, channel data corresponding to the pressed numeric key is extracted from the channel data registered in the preset table,
A digital terrestrial broadcast receiver configured to set the extracted channel data in the receiving circuit. The receiver of claim 1,
A terrestrial digital broadcast receiver configured to start the scan when the reception status of the terrestrial digital broadcast deteriorates. The receiver according to claim 1 or claim 2,
When the transmitting station identifier is obtained by the scan, the transmitting station identifier is compared with the transmitting station identifier obtained by the previous scan,
A terrestrial digital broadcast receiver that executes the update of the preset table only when the comparison shows that the two are different.

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