JP3863858B2 - Digital broadcast receiver - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a digital broadcast receiving apparatus that receives a digital broadcast.
[0002]
[Prior art]
A digital broadcast receiver that receives a digital broadcast using a satellite or a terrestrial wave selects an arbitrary broadcast wave from a plurality of broadcast waves received through a satellite antenna or a terrestrial antenna with a digital tuner, and selects the selected broadcast wave. An arbitrary channel is selected from among a plurality of channels included in the image by demultiplexing processing, a digital signal of the selected channel is taken out and decoded to output a video / audio signal.
[0003]
By the way, in such digital broadcasting, a key (one touch key, preset key, etc.) is assigned to each broadcaster, and a desired broadcaster's channel can be directly selected by operating the assigned key. Is considered. As a related art related to this, there is one that selects one channel from among a plurality of channels of one broadcaster assigned corresponding to a predetermined button (see Patent Document 1).
[0004]
In digital terrestrial broadcasting, broadcast information (region identifier, service type, broadcast station identification, service number) is multiplexed on the broadcast wave, and a three-digit channel number is calculated and assigned to each broadcast by the following formula. A technique is used.
[0005]
3-digit number = (service type × 200) + (remote control key ID × 10) + service number + 1
[0006]
Broadcast information: multiplexed on radio waves transmitted from a broadcast station, and the receiver determines various attributes of the broadcast station based on this.
Regional identifier: This is for associating a broadcast with a region. The receiver compares the value set for specifying the installation location with the region identifier, and the broadcast is broadcast for this region. Determine whether or not.
Service type: 0-7
It indicates whether the broadcast is a television type service or a data type broadcast.
Remote control key ID: 0-12
It is a number assigned to each broadcasting station in the area, and is also used for assignment to a remote control one-touch key. It is unique within a region, but the same number may be used in other regions.
Service number: 0-7
A number that a broadcast station sets for identification when the broadcast station operates multiple broadcasts.
[0007]
[Patent Document 1]
JP-A-10-149451
[Problems to be solved by the invention]
However, in a digital terrestrial broadcast receiving apparatus, there is a possibility that a broadcast outside the area may be received depending on the installation location. Therefore, the three-digit number calculated by the above formula is duplicated in a plurality of broadcasts. There may be cases. Therefore, even if the user inputs a three-digit channel number for channel selection, it is unclear which broadcast will be selected.
[0009]
In view of the above circumstances, the present invention provides a digital broadcast receiver capable of receiving broadcasts outside the region and receiving a desired broadcast without problems even when channel numbers are duplicated in a plurality of broadcasts. The purpose is to provide.
[0010]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the digital broadcast receiving apparatus of the present invention has a means for scanning a broadcast transmitted from a terrestrial digital broadcast station, and based on information multiplexed on the broadcast detected by the scan. In a digital broadcast receiving apparatus comprising: means for associating a broadcast with a channel number; and means for selecting a broadcast corresponding to a channel number input by a user, wherein the channel number is duplicated in a plurality of broadcasts Means for distinguishing the overlapping broadcasts by attaching different branch numbers to the channel number, means for selecting a broadcast corresponding to the branch number input by a user operation, and when performing the channel selection. Storage means for storing the branch number; time measuring means for measuring time after the duplicate channel number is input; Control means for selecting the broadcast of the branch number stored in the storage means when the input of the branch number is not detected even if the passage of a predetermined time is measured by the time measurement means. It is characterized by.
[0011]
If it is said structure, a different branch number will be attached | subjected to each of several broadcast with which a channel number mutually overlaps. Then, when a predetermined time elapses after the input of overlapping channel numbers, the broadcast of the branch number selected last time is automatically selected.
[0012]
If the input of the branch number is not detected even if the passage of a predetermined time is measured by the time measuring means, and the branch number is not stored in the storage means, a display prompting the user to input the branch number is displayed. Means may be provided. Further, when the input of the branch number is not detected even if the passage of a predetermined time is measured by the time measuring unit, and the branch number is not stored in the storage unit, a predetermined reference branch number is determined. It may be configured to select a broadcast.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
A digital broadcast receiver according to an embodiment of the present invention will be described below with reference to FIGS.
[0014]
In FIG. 1, a terrestrial antenna 1 is disposed outdoors in a predetermined direction and receives a terrestrial digital broadcast signal. The terrestrial antenna 1 gives the received signal to the terrestrial digital tuner 2.
[0015]
The terrestrial digital tuner 2 extracts a signal having a specific frequency from the high-frequency digital modulation signal including video / audio data. The terrestrial digital tuner 2 includes a demodulation circuit, a deinterleave circuit, an error correction circuit, etc., and demodulates the selected digital modulation signal to output a transport stream.
[0016]
The demultiplexer (DEMUX) 3 converts the transport stream into MPEG2 (Moving Picture Experts Group 2) video stream, audio stream, PSI / SI (Program Specific Information / Service Information) and broadcast information (region identifier, service type). , Broadcast station identification, service number). The demultiplexer 3 supplies the video stream and the audio stream to the AV decoder 4 and supplies PSI / SI, broadcast information, and the like to the CPU 13.
[0017]
The AV decoder 4 includes a video decoder that decodes a video stream and an audio decoder that decodes an audio stream. The video decoder decodes the input variable length code to obtain a quantization coefficient and a motion vector, and performs inverse DCT conversion, motion compensation control based on the motion vector, and the like. The audio decoder decodes the input encoded signal to generate audio data. The video data generated by the decoding is output to the video processing circuit 5, and the audio data is output to the audio processing circuit 6.
[0018]
The video processing circuit 5 receives video data from the AV decoder 4 and performs D / A conversion, for example, to convert it into a composite video signal. The audio processing circuit 6 receives the audio data output from the AV decoder 4 and performs D / A conversion to generate, for example, a right (R) sound analog signal and a left (L) sound analog signal.
[0019]
The video output circuit 7 and the audio output circuit 8 include an output resistor, an amplifier, and the like. The AV output terminal 9 is provided with an output unit (a set of left and right audio output terminals and video output terminals), and a monitor 16 having a CRT 16a and a speaker 16b by a video / audio code 17 is provided in this output unit. Connected.
[0020]
The OSD (On Screen Display) circuit 12 outputs video data based on character information and color information instructed to be output from the CPU 13 to the adder 20. The adder 20 performs processing for incorporating the video data into the received video data output from the AV decoder 4. The OSD circuit 12 can display a menu screen and various setting screens.
[0021]
As shown in FIG. 2, the remote control transmitter 10 is provided with various keys and sends various commands to the broadcast receiving apparatus 30. When the key is operated, the remote control transmitter 10 means a command corresponding to the key. Signal light (remote control signal) is transmitted from the light emitting unit. The remote control light receiver 11 receives the signal light, converts it into an electric signal, and gives it to the CPU 13. In this embodiment, the keys with numbers “1” to “12” provided on the remote control transmitter 10 are set as one-touch keys, and broadcasting is assigned to each one-touch key. Further, when the “numeric input” key of the remote control transmitter 10 is operated, the channel selection by the channel number input can be performed by subsequently performing the key operation for three digits.
[0022]
In a memory (for example, RAM, EEPROM, flash memory, etc.) 14, information for displaying an EPG screen, a channel table (a channel list in which frequency information, broadcasting station name, etc. are associated with remote control key IDs and channel numbers), A database in which broadcasts and remote control key IDs in each region of the country are associated is stored.
[0023]
The CPU 13 performs overall control in the digital broadcast receiving apparatus 30. In particular, as processing according to the present invention, channel scan processing, broadcast information acquisition processing in this scan, one-touch key assignment processing, one-touch key operation Channel selection processing, channel table contents OSD display processing, three-digit number input channel selection processing, and the like.
[0024]
The digital broadcast receiver 30 normally performs a process of detecting a receivable broadcast by scanning a target frequency band at the time of start-up (or only once at the time of installation), and broadcast information multiplexed in each broadcast. The channel table is created by associating the information necessary for channel selection of the broadcast with the channel number according to the calculation formula described above, and the channel table is stored in the memory 14. At this time, it is determined whether or not the calculated channel number is duplicated in a plurality of broadcasts. A branch number is not added to the channel number for a non-overlapping broadcast, and 0, 1, Branch numbers are assigned (assigned) in order like 2,. Further, the initial value of the branch number storage area is set to, for example, 8 bits as “FF”, and if “FF” is maintained, it can be determined that no branch number is given. Of course, the initial value of the branch number storage area may be set to “00” with, for example, 8 bits. If it remains “00”, no branch number may be assigned, and “01” and thereafter may indicate duplication. . In the channel list shown in FIG. 3A, channel numbers of xx digital broadcasting and OO digital television are duplicated. The branch number 0 is assigned to the xx digital broadcast, and the branch number 1 is assigned to the OO digital television.
[0025]
In order to view the above channel list, the user performs an input operation using the remote control transmitter 10. For example, the “menu” key of the remote control transmitter 10 is pressed. In response to this key operation, the CPU 13 outputs a memory control signal and takes out the channel table from the memory 14 as memory data. Then, the OSD display circuit 12 generates an OSD video signal for displaying a channel list according to the channel table. The created OSD video signal is superimposed on the received video output from the video processing circuit 5 and output via the video output circuit 7. Thereby, as shown in FIG. 3A, an on-screen display of the channel list is made on the screen.
[0026]
When the user inputs a channel number and selects a channel, the remote control transmitter 10 is operated to perform necessary input processing. Specifically, the “numeric input” and “1” to “0” keys of the remote control transmitter 10 are pressed. First, when the “number input” key is pressed, the CPU 13 displays a three-digit input frame as shown in FIG. When the numeric keypad “1” to “0” is continuously pressed, the CPU 13 displays it one by one, and when the three-digit input is completed, selects the broadcast corresponding to the input three-digit input. Information is acquired from the channel table described above, and a tuner control signal is output in accordance with this information so as to select a designated channel.
[0027]
Here, when there are a plurality of broadcasts associated with the input channel number in the channel table, it is unclear which channel should be selected as it is. ), A message indicating that is displayed on-screen, and the three-digit input frame is changed to an input frame for branch number input. The user inputs a branch number by operating the numeric keypad of the remote control transmitter 10 with reference to the above-described channel list. The CPU 13 receives the remote control signal indicating the branch number, identifies the broadcast, and controls the tuner to select the designated broadcast. In the channel list illustrated in FIG. 3A, if the 0 key is operated as the branch number, xx digital broadcasting is selected, and if the 1 key is operated, XX digital television is selected. .
[0028]
Further, as shown in FIGS. 5A and 5B, when the three-digit input is completed, all of the plurality of broadcasts associated with the input channel number are displayed together with a message indicating duplication. It may be. The user looks at this list display, changes the color of the notation of the desired broadcast by operating the arrow keys of the remote control transmitter 10 (moves the cursor), and decides with the “OK” key, It can be determined by pressing the same numeric key as the branch number displayed at the left end.
[0029]
When the CPU 13 executes a process of selecting one broadcast with an overlapping channel number based on the input of the branch number, the memory 14 indicates that the branch number has been selected by the user for the channel number (previous branch number information). Remember it. Further, the CPU 13 instructs the timer 21 to measure time (for example, 5 seconds) when a display for prompting input of branch numbers (an input frame for branch number input, a list, etc.) is performed. When the branch number input cannot be detected even when a signal indicating the passage of time is received from the timer 21, it is determined whether or not the previous branch number information is stored in the memory 14 for the channel number.
[0030]
(1) When the previous branch number information is stored in the memory 14, the CPU 13 reads the channel selection information from the channel table based on the previous branch number information read from the memory 14, and controls the tuner 2 based on the channel selection information to broadcast. Process to receive. In this case, once the branch number is entered, the previous branch number broadcast is automatically received without any input in response to the subsequent branch number input request. Time and effort is reduced.
[0031]
(2) When the previous branch number information is not stored in the memory 14 In such a case, when it is programmed to select the branch number with the smallest number, the branch number with the smallest number is selected and this selection is performed. A channel selection process is performed based on the branch number. The branch number with the smallest number is not limited to the reference number. For example, a process of receiving a broadcast to which the number “0” is assigned (based on the number “0”) is performed. It may be. For example, a “reference branch number setting menu” is provided on the menu screen, and the numbers and settings input on the menu screen are stored in the memory 14 for subsequent processing. If there is no such setting, the default value may be used. Even in such a configuration, a broadcast having a predetermined branch number is automatically received, thereby reducing the user's operation. In addition to performing such automatic channel selection, the process of continuing the display for prompting the input of the branch number shown in FIG. 4 or FIG. 5 or the display form is slightly changed (for example, the message portion is displayed in a blinking manner). Continuous display may be performed. The branch number input by the user in this continuous display is used as the previous branch number information, and is used for automatic channel selection when the next channel number is duplicated.
[0032]
For the broadcast receiving apparatus 30, an area identification number for specifying the installation location can be set by a function such as a user setting menu of the receiving apparatus 30. In addition, the broadcast receiving apparatus 30 has a function (so-called one-touch key channel selection function) for selecting a broadcast assigned thereto by simply pressing one key of the remote control transmitter 10. In addition, a remote control key ID indicating which one-touch key of the remote control transmitter 10 should be assigned to each broadcast is determined for each region, and the receiving device 30 stores a correspondence between the broadcast and the remote control key ID in each region throughout the country. Is stored in the memory 14. When the receiving device 30 performs the above-described scanning, it extracts the broadcast area identifier and broadcast station identification from the broadcast information, and if the area identifier and the area identification number set in the receiving device 30 match, The remote control key ID is referenced from the database, and the corresponding one-touch key is assigned for receiving the broadcast. If a broadcast in which the area identification number and the area identifier do not match is received, an empty remote control key ID (one touch key) is automatically assigned to the broadcast. A list of one-touch keys when assigned in this way is illustrated in FIG. Here, XX digital broadcasting and XX digital television remote control key ID were originally duplicated, but XX digital television is broadcast outside the region, so it is assigned to the vacant remote control key ID (5). The association is performed, and the one-touch key 5 is assigned. The channel number in the OO digital is associated with the vacant remote control key ID (5), so that another channel number that does not overlap with other channel numbers is calculated based on the remote control key ID. (005) is assigned. As a result, when the user wants to select a channel of XX digital television by inputting the channel number, it is only necessary to input 005, and even when broadcasting outside the area can be received, duplication of broadcasting tuning occurs. There will be no.
[0033]
【The invention's effect】
As described above, according to the present invention, it is possible to receive broadcasts outside the region and receive desired broadcasts without problems even when channel numbers are duplicated in a plurality of broadcasts. Play.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a digital broadcast receiving apparatus according to an embodiment of the present invention.
FIG. 2 is a plan view showing a remote control transmitter.
FIG. 3A is an explanatory diagram of a channel list display screen, and FIG. 3B is an explanatory diagram of a one-touch key list screen.
FIG. 4A is an explanatory diagram showing a screen on which a 3-digit input frame for inputting a channel number is displayed, and FIG. 4B is an explanatory diagram of a screen that prompts input of branch numbers. It is.
FIG. 5A is an explanatory diagram showing a screen on which a three-digit input frame for inputting a channel number is displayed, and FIG. 5B is an explanatory diagram of a screen prompting selection of broadcast. is there.
[Explanation of symbols]
1 Antenna 2 Tuner 3 Demultiplexer (DEMUX)
4 AV decoder 12 OSD circuit 13 CPU
14 memory

Claims (1)

Means for scanning a broadcast transmitted from a terrestrial digital broadcasting station; means for associating the broadcast with a channel number based on information multiplexed in the broadcast detected by the scan; and a channel number input by a user Means for selecting a broadcast corresponding to a digital broadcast receiving apparatus comprising:
When the channel number is duplicated in a plurality of broadcasts, a means for distinguishing the duplicate broadcasts by attaching different branch numbers to the channel numbers and a broadcast corresponding to the branch number input by the user operation are selected. Means for storing, storage means for storing the branch number when the channel is selected, time measuring means for measuring time after the duplicate channel number is input, and a predetermined time by the time measuring means. If the input of the branch number is not detected even if the passage of time is measured, the control means for selecting the broadcast of the branch number stored in the storage means, and the passage of the predetermined time by the time measuring means Means for displaying a message prompting the user to input a branch number when the branch number input is not detected even if the measurement is performed and the branch number is not stored in the storage means. Ijitaru broadcast receiver.

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