JP2007306455A - Digital broadcasting receiver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a digital television receiver capable of making the selection of channels clearly understandable. <P>SOLUTION: The digital television receiver is provided with: a receiving circuit 10 for receiving a digital television broadcast and outputting a video signal and an audio signal of a prescribed channel; first and second operation keys 42N, 42P; a preset table; an OSD circuit for forming a prescribed video signal; and a control circuit 30 for controlling the selection and display of channels. When the first operation key 42N or the second operation key 42P is operated, the control circuit 30 supplies station name data registered in the preset table to the OSD circuit 33 as display data, and the OSD circuit 33 generates a video signal for displaying a station name in a list form, and supplies the video signal, superimposed on the video signal outputted from the receiving circuit 10 to a display means 30, or in place of the video signal outputted from the receiving circuit 10. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a digital broadcast receiver.

  Terrestrial digital broadcasting, BS broadcasting, and CS broadcasting are performed as digital television broadcasting. The receiver for digital television broadcasting is generally provided with a channel (service) preset function and a channel up / down function.

  In the channel preset function, when any of the numeric keys is pressed, a channel preset (registered) 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.

For example, there are the following prior art documents.
JP 2001-45399 A

  By the way, in the case of a digital television broadcast receiver, it takes time to process the received digital data. For this reason, in a digital TV broadcast receiver, compared to an analog TV broadcast receiver, it takes a lot of time from the key operation for channel change to the actual output of the changed video (and audio). During that time, the screen remains black.

  Therefore, in some receivers, when a channel change key operation is performed, the TV station name or logo of the channel is displayed until the video of the target channel can be output.

  In this case, if the channel is selected by the preset function, the channel is selected by designating the target channel, so that there is no problem. However, when selecting a channel with the channel up / down function, pressing the key changes the channel while the black screen and the next channel screen are displayed alternately, so which channel will be selected next. Confusing. Alternatively, in order to select a channel that is far away from the channel currently being viewed, it is necessary to check the TV station name and logo that are displayed each time the key is pressed.

  The present invention is intended to solve such problems.

In this invention,
A receiving circuit that receives a digital television broadcast and outputs a video signal and an audio signal of a predetermined channel;
First and second operation keys;
A preset table,
An OSD circuit for forming a predetermined video signal;
A control circuit for controlling the selection and display of the channel,
The preset table is
Channel data for specifying the above channel,
Multiple sets of station name data for displaying the station name of the TV station corresponding to the channel are registered,
The control circuit is
When the first or second operation key is operated, a video signal for supplying the station name data registered in the preset table as display data to the OSD circuit and displaying the station name in a list format. Form the
The video broadcast signal is supplied to the display means instead of or superimposed on the video signal output from the receiving circuit.

  According to the present invention, which channel is currently being processed for reception, how far the target channel is, how many times the target channel should be pressed, or when the key is pressed, It is easy to know which channel is selected, and channel selection is easy to understand.

  Also, the correspondence between keys and selected channels is easy to understand. Furthermore, even if it takes time until the video of the channel after the change is actually output after the key operation for the channel change is performed, the target channel can be appropriately selected.

[1] Configuration FIG. 1 shows an example in which the present invention is applied to a receiver for digital terrestrial television broadcasting. 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 digital data (transport stream) in the MPEG2 format is demodulated and taken out. This digital data is supplied to the TS decoder circuit 15 for the purpose. The video and audio data streams of the channels to be selected are selected and decoded.

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

  The audio data stream decoded by the TS decoder circuit 15 is decoded into the original digital audio signal supplied to the audio decoder circuit 21 and is also 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, the receiver has a system control circuit 30. The system control circuit 30 is for controlling the channel received by the receiving circuit 10 and the display of the LCD panel 18. For this reason, the system control circuit 30 includes a microcomputer (not shown). Then, a tuning signal is supplied from the system control circuit 30 to the tuner circuit 12, a control signal is supplied to the demodulation circuit 14 and the TS decoder circuit 15, and a status is sent from the demodulation circuit 14 and the TS decoder circuit 15 to the system control circuit 30. A signal is supplied.

  In addition, various operation switches 31 are connected to the system control circuit 30 and a receiving unit 32 of a remote controller (remote operation) is connected. The receiving unit 32 is paired with a remote control transmitter 40, and the transmitter 40 and the receiving unit 32 realize a remote control using infrared rays, for example. The transmitter 40 includes numeric keys 41 of “1” to “12” and a next key 42N and a previous key 42P for realizing a channel up / down function as a part of the operation switch. The numeric key 41 is also a preset key for realizing a preset function, as will be described later.

  Further, the OSD circuit 33 is connected to the system control circuit 33. The OSD circuit 33 forms a predetermined digital video signal according to display data from the system control circuit 30 and supplies it to the LCD panel 18 through the drive circuit 17.

  The system control circuit 30 is provided with a routine 100 as shown in FIG. 2, for example, as a part of a program executed by the CPU (not shown). The routine 100 is for realizing a channel up / down function. Details of the routine 100 will be described later. In FIG. 2, the routine 100 shows only the portion related to the present invention.

  Further, the system control circuit 30 has a nonvolatile memory 30A, and a preset table PTBL as shown in FIG. 3, for example, is prepared in the nonvolatile memory 30A. This preset table PTBL is for realizing channel selection by the preset function and channel selection by the channel up / down function.

  That is, in the example of FIG. 3, the preset table PTBL includes channel data DCH, station name data DNAME, channel number data DNO, and a selection flag FSEL as a set, and this set of data is transmitted to the remote control transmitter. Each of the 40 numeric keys 41 (“1” to “12” key) is provided.

  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. The station name data DNAME is data for displaying a television station name, a logo, and the like on the LCD panel 18, and the channel number data DNO is data for displaying a channel number on the LCD panel 18.

  Further, the selection flag FSEL is a flag that is “1” for the currently selected channel and the numeric keys to which the channel is preset, and “0” otherwise. FIG. 3 shows a case where the selection flag FSEL corresponding to the numeric key “3” is set to “1” and the selection flags FSEL corresponding to the other numeric keys are reset to “0”.

  Each data in the preset table PTBL can be registered in the same manner as a general synthesizer receiver. Further, the station name data DNAME can be obtained through broadcasting of the corresponding channel.

[2] Operation [2-1] Channel Selection by Preset Function In this case, of the numeric keys 41 of the remote control transmitter 40, the numeric key in which the target channel is preset is pressed.

  That is, of the numeric keys 41, for example, when the “3” key is pressed, this is transmitted from the transmitter 40 to the receiver 32 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 of the memory 30A, and the extracted channel data DCH3 is supplied to the tuner circuit 12 and the TS decoder circuit 15. Supplied.

  As a result, the tuner circuit 12 selects a received signal including a channel preset in the “3” key, and the TS decoder circuit 15 selects video and audio data of the channel preset in the “3” key. A stream is selected and decoded. Accordingly, the digital video signal of the channel preset in the “3” key is taken out from the video decoder circuit 16 and supplied to the LCD panel 18 through the drive circuit 17. The video of the channel preset in the “3” key is displayed.

  The audio decoder circuit 21 outputs an analog audio signal of a channel preset to the “3” key, and this audio signal is supplied to the speaker 22. Therefore, the sound of the channel preset to the “3” key is output from the speaker 22.

  Further, at this time, the station name data “XX TV” is extracted from the “3” key set and the channel number data “* 4 *” is extracted from the preset table PTBL, and these data are sent to the OSD circuit 33. Supplied as display data. As a result, a predetermined digital video signal corresponding to the display data is formed in the OSD circuit 33, and this video signal is supplied to the LCD panel 18 through the drive circuit 17. 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

  Further, as shown in FIG. 3, in the preset table PTBL, the selection flag FSEL corresponding to the “3” key, that is, the flag FSEL corresponding to the channel selected by the current channel selection operation is set to “1”. The selection flag FSEL corresponding to the channel selected so far is reset to “0”.

  In this way, when any one of the “1” to “12” keys of the numeric key 41 is pressed, a channel preset to the pressed key is selected, and the channel can be received.

[2-2] Channel Selection by Channel Up / Down Function In this case, when viewing an arbitrary channel among the channels preset in the preset table PTBL, the next key 42N of the remote control transmitter 40 or the previous key Press the key 42P.

  Then, in the same way as in the case of [2-1], the system control circuit 30 is notified that the next key 42N or the previous key 42P has been pressed. A routine (100) is executed by a CPU (not shown), and channels registered in the preset table PTBL are sequentially selected.

  That is, when the system control circuit 30 is notified that the next key 42N or the previous key 42P has been pressed, the CPU processing starts from step 101 of the routine 100. Next, in step 102, the system control circuit 30 The decoder circuit 16 is controlled and the digital video signal supplied to the drive circuit 17 is subjected to blanking processing, so that the LCD panel 18 has a black screen, for example.

  Subsequently, in step 111, the selection flag next to the selection flag set to “1” in the selection flag FSEL of the preset table PTBL (when the next key 42N is pressed) or the previous selection flag (previous key). (When 42P is pressed) is set to “1”, and the selection flag of “1” is set to “0” until then. Note that “next” means the direction in which the number on the number key 41 increases (downward direction in FIG. 3), and “previous” indicates the direction in which the number on the number key 41 decreases (in FIG. Direction).

  In step 112, the channel data DCH is extracted from the preset table PTBL in which the selection flag FSEL is “1”. In the case of FIG. 3, since FSEL = "1" is a "3" key set, channel data DCH3 of this "3" key set is taken out. Further, in step 113, the channel data DCH extracted in step 112, in the case of FIG. 3, the channel data DCH3 is set in the tuner circuit 12 and the TS decoder circuit 15.

  Therefore, thereafter, the tuner circuit 12 and the TS decoder circuit 15 start processing for selecting the channel data DCH extracted in step 112, that is, the channel preset in the “3” key in the case of FIG. In other words, when the next key 42N or the previous key 42P is pressed while viewing an arbitrary channel, the process of selecting the next or previous channel from the channels preset in the preset table PTBL is started. Become.

  During this process, the CPU proceeds from step 113 to step 114, where all station name data DNAME and channel number data DNO registered in the preset table PTBL are extracted. The extracted data is supplied to the OSD circuit 33 as display data. As a result, a predetermined digital video signal corresponding to the display data is formed in the OSD circuit 33, and this video signal is supplied to the LCD panel 18 through the drive circuit 17, for example, as shown in FIG. The channel number is displayed as a station name list 18L.

  Further, at this time, in the station name list 18L, the station name and channel number display position where FSEL = "1" is displayed. In the case of FIG. 3, in the group where FSEL = "1", the station name and channel are displayed. Since the numbers are “XX TV” and “* 4 *”, as shown in FIG. 4, a cursor 18C is displayed as an index at the display positions of “XX TV” and “* 4 *”. The cursor 18C can be displayed in reverse video.

  That is, when the next key 42N or the previous key 42P is pressed while viewing an arbitrary channel, the next or previous channel selection process is started and, as shown in FIG. Is displayed in the form of the list 18L, and the cursor 18C is displayed at the display position of the channel currently being selected.

  As described below, the cursor 18C moves up and down in the station name list 18L. However, as described above, the direction in which the number key 41 increases is “next”, and the number key 41 Since the direction in which the number decreases is “Previous”, as shown in FIG. 4, the downward direction is “Next” and the upward direction is “Previous” as viewed from the cursor 18C.

  Subsequently, in step 115, it is determined whether or not the next key 42N or the previous key 42P is pressed. If not, the process proceeds from step 115 to step 116. In step 116, the TS decoder circuit 15 is determined. By checking the status signal obtained from the above, it is determined whether or not the channel selection started in step 113 has been completed and the video signal and the audio signal can be normally obtained. When the video signal and the audio signal are not yet obtained normally, the process returns from step 116 to step 115.

  Accordingly, steps 115 and 116 are repeated for a period until the selection of the channel started in step 113 is completed and the video signal and the audio signal are normally obtained.

  When the next key 42N or the previous key 42P is pressed during this repetition period, this is determined in step 115, and the process returns from step 115 to step 111. Accordingly, step 111 is executed again and the selection flag FSEL is updated. In the case of FIG. 3, the selection flag FSEL of the “4” key or the “2” key is set to “1”, and the selection flag of the “3” key. FSEL is set to “0”. That is, the selection flag FSEL next to or before the selection flag FSEL previously set to “1” is set to “1”, and the selection flag FSEL of “1” is set to “0” until then.

  Then, since step 112 and subsequent steps are executed, processing for selecting the next or previous channel is started in response to the selection flag FSEL updated in step 111, and the channel being selected is selected. The cursor 18C is displayed at the station name display position. Thereafter, steps 115 and 116 are repeated.

  Thus, when the next key 42N or the previous key 42P is pressed, the channels registered in the preset table PTBL are sequentially selected, the station name list 18L is displayed, and the cursor 18C corresponds to the channel being selected. Move.

  The next data set in the preset table PTBL is followed by the first data set, and before the first data set is the last data set. Therefore, when the next key 42N or the previous key 42P is continuously pressed, or when it is continuously pressed many times, the channels registered in the preset table PTBL are selected in a circulating manner.

  When the selection of the channel started in step 113 is completed and the video signal and the audio signal are normally obtained during the period in which steps 115 and 116 are repeated, this is determined by the status signal from the TS decoder circuit 15. In addition to being notified to the system control circuit 30, this notification is determined in step 116, and the process proceeds from step 116 to step 121.

  In step 121, the blanking process of the video decoder circuit 16 is canceled and a digital video signal is output from the video decoder circuit 16 and supplied to the LCD panel 18. As a result, the video of the channel selected in step 113 is displayed. It is displayed on the LCD panel 18. Further, in step 122, the OSD circuit 33 is controlled, and the display of the station name list 18L displayed in step 114 is terminated. Thereafter, the routine 100 is terminated in step 123.

  Thus, according to this routine 100, when the next key 42N or the previous key 42P is pressed or kept pressed, the channels are sequentially selected in the next direction or the previous direction according to the channel data DCH registered in the preset table PTBL. Go. At this time, the station name list 18L is displayed on the LCD panel 18 in accordance with the station name data DNAME registered in the preset table PTBL, and the cursor 18C moves to the station name display position of the selected channel. To go.

  Therefore, when the channel is changed by pressing the next key 42N or the previous key 42P, how far the target channel is from the currently selected channel, or which channel is selected when the keys 42N, 42P are pressed. It is easy to know whether the channel is selected, and the channel selection is easy to understand.

[3] Summary According to the above television receiver, when the channel is changed by pressing the next key 42N or the previous key 42P, the channel is changed according to the channel data DCH registered in the preset table PTBL. As shown in FIG. 4, during the channel change, the television station names are displayed as a list 18L, and the name of the channel currently being received is indicated by the cursor 18C.

  Therefore, which channel is currently being processed for reception, how far the target channel is, how many times the target channel should be pressed the keys 42N and 42P, or when the keys 42N and 42P are pressed In addition, it is easy to know which channel is selected, and the selection of the channel is easy to understand.

  When the next key 42N or the previous key 42P is pressed, for example, as shown in FIG. 4, a list 18L of television station names is displayed, and the cursor 18C moves in the list 18L to be selected. Since the station name is instructed, the correspondence between the keys 42N and 42P and the selected channel is easy to understand. Furthermore, even if it takes time until the changed video is actually output after the channel change key operation, the target channel can be selected appropriately.

[4] Others In the above description, when the channel is changed by pressing the next key 42N or the previous key 42P, the station name of the channel currently being received is indicated by the cursor 18C. For example, as shown in FIG. It is also possible to indicate by displaying the mark 18 in front of the station name to be performed. Alternatively, it can be used as an indicator by changing the character color of the corresponding station name or by highlighting it.

  In the above description, the broadcast video is prohibited or permitted in steps 102 and 121. However, this may be executed by the video decoder circuit 16. Further, the operation switch 31 may include a switch that functions similarly to the keys 41, 42N, and 42P of the transmitter 40. When the station name list 18L is displayed, the data sets of the preset table PTBL can be sorted and displayed in the order of channel numbers, for example.

[List of abbreviations]
BS: Broadcasting Satellite
CPU: Central Processing Unit
CS: Communication Satellite
D / A: Digital to Analog
LCD: Liquid Crystal Display
MPEG: Motion Picture Experts Group
MPEG2: MPEG Phase 2
OSD: On Screen Display
TS: Transport Stream

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 which shows the data table which can be used for this invention. It is a figure which shows an example of a screen display. It is a figure which shows the other example of a screen display.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Reception circuit, 30 ... System control circuit, 31 ... Operation switch, 32 ... Remote control receiver, 33 ... OSD circuit, 40 ... Remote control transmitter, 41 ... Number key, 42N ... Next key, 42P ... Previous key

Claims (3)

A receiving circuit that receives a digital television broadcast and outputs a video signal and an audio signal of a predetermined channel;
First and second operation keys;
A preset table,
An OSD circuit for forming a predetermined video signal;
A control circuit for controlling the selection and display of the channel,
The preset table is
Channel data for specifying the above channel,
Multiple sets of station name data for displaying the station name of the TV station corresponding to the channel are registered,
The control circuit is
When the first or second operation key is operated, a video signal for supplying the station name data registered in the preset table as display data to the OSD circuit and displaying the station name in a list format. Form the
A digital broadcast receiver in which this video signal is supplied to the display means instead of or superimposed on the video signal output from the receiving circuit. The digital broadcast receiver according to claim 1, wherein
When the first operation key is operated, the next set of the data sets registered in the preset table is selected,
The selected next set of channel data is supplied to the receiving circuit to select a corresponding channel,
A video signal of an index indicating a station name displayed by the selected next set of station name data is formed and supplied to the display means,
When the second operation key is operated, the previous set of the data sets registered in the preset table is selected,
The selected previous set of channel data is supplied to the receiving circuit to select the corresponding channel,
A digital broadcast receiver configured to form an image signal of an index indicating a station name displayed by the selected previous set of station name data and to supply it to the display means. The digital broadcast receiver according to claim 2,
Have numeric keys,
When any number key among these number keys is operated, a set corresponding to the operated number key is selected from among the data sets registered in the preset table,
A digital broadcast receiver configured to supply the selected set of channel data to the receiving circuit and select a corresponding channel.

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