JP2008035317A - Digital broadcasting receiver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an in-vehicle digital broadcasting receiver capable of properly executing display associated with a broadcast wave viewable accompanying the situation of movement. <P>SOLUTION: A system controller 160 and a tuner section 120 of the receiver cooperatively scan a frequency band wherein a receivable broadcast wave that possibly exists so as to execute scanning operations for detecting a broadcast wave, containing a viewable broadcast signal at a present point at which the digital broadcast receiver is located and display a reception state detected as a result of the execution on a display section. Moreover, the system controller 160 displays characters or a pattern indicating the reception state on the display section, by interrupting the display of the video image, when a vehicle is in driving state, on the basis of a drive detection signal supplied from a drive detector 190 for detecting the driving state of the vehicle. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an in-vehicle digital broadcast receiving apparatus that can also take the form of being attached to a car navigation apparatus, for example.

In recent years, a digital broadcast receiving apparatus suitable for in-vehicle use, such as a digital broadcast receiving apparatus provided in a car navigation apparatus, is becoming widespread.
In such a digital broadcast receiving apparatus, the channel to be received (the frequency of the broadcast wave) changes as it moves between regions. For this reason, in order to perform optimal reception at the current location, it is necessary to scan and detect receivable broadcast waves in advance.

  In order to meet such a need, the tuning data is output from the control unit, the broadcast wave is sequentially scanned by the tuner unit, and information on the radio wave reception quality of each broadcast wave received at that time is obtained from the baseband processing unit. A technique has been proposed in which a plurality of radio wave reception quality information is arranged and displayed in advance on a display unit, thereby eliminating the need to search for a viewable channel for viewing.

  In this proposal, when the channel scan button provided in the keyboard of the main body configured as a mobile phone is pressed, the corresponding broadcast wave is selected sequentially from the lower channel (low channel number), and the received signal of the broadcast wave is selected. The RSSI information corresponding to the level is output from the baseband processing unit, and the output information is sequentially stored in the memory together with the channel number. Then, the channel number, broadcasting station name, and RSSI information are read from each storage area of the memory, and a plurality of the channel numbers and broadcasting station names are displayed side by side on the display. As an example of the display at this time, a method is disclosed in which the channel being scanned can be identified by a cursor moving below the channel number, and the reception quality for each channel is displayed in a bar graph form.

Based on this display, when a desired channel (channel number or broadcast station name) is selected from the keyboard, tuning in the tuner unit is executed, and the radio wave of the broadcast station desired to be viewed is selected. The signal of the selected broadcasting station is displayed on the display unit via the baseband processing unit, and the channel number or broadcasting station name, RSSI information, C / N information, and image information are displayed as necessary. (See Patent Document 1).
JP 2005-328246 A (paragraph 0036 to paragraph 0044, FIG. 1)

In the digital broadcast receiving apparatus (portable device) proposed in Patent Document 1 described above, manual full channel scanning needs to be performed as required. In addition, it cannot automatically respond to changes in reception conditions due to movement between regions, and no further proposal has been made on how to display viewable broadcast waves according to movement conditions. .
The present invention has been made in view of such circumstances, eliminates the complexity of searching for a viewable channel by performing a manual full channel scan every time it is viewed, and changes in the reception status accompanying movement between regions. It is another object of the present invention to provide a digital broadcast receiving apparatus that can automatically respond to the broadcast wave and that can appropriately display a broadcast wave that can be viewed according to the movement situation.

In order to solve the above problems, the present application proposes the following technologies.
(1) A tuner unit that selectively extracts a signal of a specific frequency from a received high-frequency digital modulation signal of a digital television broadcast and obtains a transport stream based on the extracted signal of the specific frequency; A decoder unit that obtains a video signal based on the transmitted transport stream, a system controller that comprehensively controls each unit including the tuner unit and the decoder unit, and a video display and display related to the reception status of the digital television broadcast. An in-vehicle digital broadcast receiving device configured to include a display unit, and the system controller and the tuner unit may have a frequency at which a receivable broadcast wave may exist due to their cooperation. The band is scanned and viewed at the current location where the digital broadcast receiver is located. It is configured to execute a scanning operation for detecting a broadcast wave including a signal of a possible broadcast, and to display a reception status detected as a result of the execution on the display unit, and the system controller When it is recognized that the vehicle is in a running state based on a running detection signal supplied from a running detector that detects the running status of the vehicle equipped with the receiving device, the display of the digital television broadcast image is cut off. A digital broadcast receiving apparatus configured to execute control to display characters or patterns representing a reception status on the display unit.

  In the digital broadcast receiver of (1) above, a tuner that selectively extracts a signal of a specific frequency from the received high-frequency digital modulation signal of the digital television broadcast and obtains a transport stream based on the extracted signal of the specific frequency. Unit, a decoder unit that obtains a video signal based on the transport stream obtained by the tuner unit, a system controller that comprehensively controls each unit including the tuner unit and the decoder unit, and the digital television broadcast The digital broadcast receiver is located by scanning a frequency band in which a receivable broadcast wave may exist by the cooperation of the system controller and the tuner unit. Broadcast waves including broadcast signals that can be viewed at the current location are detected. Run the scanning operation to be displayed on the display unit the detected reception status as a result of the execution.

Further, when the system controller recognizes that the vehicle is in a traveling state based on a traveling detection signal supplied from a traveling detector that detects the traveling state of the vehicle equipped with the digital broadcast receiving device, the digital television The control is executed so that the display of the character or pattern indicating the reception status is cut off on the display of the John broadcast video.
Considering the special characteristics of in-vehicle use, it prevents the viewer from generating stress by cutting off the video display while moving, which is difficult to maintain a good reception state, and also prevents the video from being disturbed by the driver. It is possible to prioritize ensuring safety without displaying.
On the other hand, when a channel selection operation such as a stop is allowed by displaying a pattern of characters or icons indicating the reception status on the display unit, the channel selection is promptly performed based on the display. The operation can be performed.

(2) A tuner unit that selectively extracts a signal of a specific frequency from a received high-frequency digital modulation signal of a digital television broadcast, and obtains a transport stream based on the extracted signal of the specific frequency; A decoder unit that obtains a video signal based on the transmitted transport stream, a system controller that comprehensively controls each unit including the tuner unit and the decoder unit, and a video display and display related to the reception status of the digital television broadcast. An in-vehicle digital broadcast receiving device configured to include a display unit for performing the system controller and the tuner unit. Scanning a frequency band to a relatively wide frequency band, the digital broadcast receiving apparatus Scanning operation in full scan mode that detects broadcast waves including broadcast signals that can be viewed at the current location and scanning at a relatively narrow frequency band that is a part of the entire frequency band allows viewing at the current location All of the broadcast waves including the viewable broadcast signals detected by the scanning operation in the local scan mode, selectively performing a scan operation in the local scan mode for detecting a broadcast wave including a simple broadcast signal The digital broadcast receiving apparatus is configured to display a symbolic display representing the message on the display unit.

  In the digital broadcast receiving apparatus of (2) above, a tuner that selectively extracts a signal of a specific frequency from the received high frequency digital modulation signal of the digital television broadcast and obtains a transport stream based on the extracted signal of the specific frequency. Unit, a decoder unit that obtains a video signal based on the transport stream obtained by the tuner unit, a system controller that comprehensively controls each unit including the tuner unit and the decoder unit, and the digital television broadcast A display unit that displays video and reception status, and scans the entire frequency band or a relatively wide frequency band where a receivable broadcast wave may exist by the cooperation of the system controller and the tuner unit. Can be viewed at the current location where the digital broadcast receiver is located. Scanning operation in full scan mode that detects broadcast waves including various broadcast signals and scanning a relatively narrow frequency band (a limited frequency band applied to a specific region) that is part of the entire frequency band A scanning operation in a local scan mode for detecting a broadcast wave including a broadcast signal that can be viewed at the current location is selectively executed.

A symbolic display representing all broadcast waves including viewable broadcast signals detected by the scanning operation in the local scan mode is displayed on the display unit.
For this reason, it becomes possible to grasp | ascertain the situation of the broadcast wave containing the signal of the broadcast which can be viewed in the specific area where the said digital broadcast receiver is located in a list.

(3) The system controller displays a symbolic display representing a broadcast wave including a viewable broadcast signal detected by the scanning operation on the display unit with a cursor display for selecting the broadcast. The digital broadcast receiver according to any one of (1) and (2), which is configured as described above.
In the digital broadcast receiver of (3) above, particularly in the digital broadcast receiver of any one of (1) or (2), a symbolic symbol representing a broadcast wave including a viewable broadcast signal detected by the scanning operation. Since the display is displayed on the display unit with a cursor display for selecting the broadcast, the user can easily select a desired broadcast.

(4) The system controller is configured to allow a digital television broadcast channel selection operation when it is recognized that the vehicle is stopped based on a travel detection signal supplied from a travel detector. (1) The digital broadcast receiver characterized by the above-mentioned.
In the digital broadcast receiving apparatus of (4) above, since the digital broadcast receiving operation of the digital television broadcast is permitted when the vehicle is recognized to be stopped in the digital broadcast receiving apparatus of (1), Safety related to the running of the vehicle is not hindered, and an accurate tuning operation can be performed.

(5) The system controller is configured to display, on the display unit, a symbolic display representing each individual broadcast wave targeted for detection at each corresponding time point by the scanning operation ( The digital broadcast receiver according to any one of 1) and (2).
In the digital broadcast receiver of (5) above, in particular, in the digital broadcast receiver of any one of (1) or (2), each broadcast wave that is targeted for detection at each relevant time point by the scanning operation is represented. Since the symbolic display is displayed on the display unit, the progress of the scanning operation can be easily monitored.

  (6) The system controller displays a symbolic display representing each broadcast wave targeted for detection at each corresponding time point in the scanning operation in the local scan mode on the display unit, and allows viewing of a viewable broadcast. The digital broadcast receiving apparatus according to (2), wherein a symbolic display representing a broadcast wave including a signal is continuously displayed on the display unit.

  In the digital television receiver of (6) above, in particular, in the digital broadcast receiver of (2), symbolic display representing each broadcast wave that is detected at each corresponding time in the scanning operation in the local scan mode. Is displayed on the display unit, and a symbolic display representing a broadcast wave including a viewable broadcast signal is continuously displayed on the display unit, so that the progress of the scanning operation can be easily monitored, In addition, it is possible to clearly grasp which broadcast is in a viewable state.

(7) The system controller is configured to display on the display unit a local area including each broadcast wave to be detected in the scanning operation in the local scan mode. (2) Digital broadcast receiving apparatus.
In the digital television receiver of the above (7), in particular, in the digital broadcast receiver of (2), a display indicating a local area including each broadcast wave to be detected in the scanning operation in the local scan mode is displayed on the display unit. Therefore, it is obvious which region the scanning operation is performed in the local scan mode.

(8) The system controller is configured to display on the display unit only a local area including a broadcast wave to be detected at a current time point in the scanning operation in the local scan mode. (2) The digital broadcast receiver.
In the digital television receiver of (8) above, in particular, in the digital broadcast receiver of (2), a display showing only the local area including the broadcast wave that is detected at the current time point in the scanning operation in the local scan mode. Since the image is displayed on the display unit, it is obvious at which time the scanning operation in the local scan mode is performed for the current region.

  (9) The system controller and the tuner unit may further perform a scanning operation in a slow scan mode in which scanning in the full scan mode and / or the local scan mode is performed at a lower speed than usual by the cooperation of both. The system controller is configured to display the number of a physical channel corresponding to each individual broadcast wave that is a detection target at each corresponding time in the scanning operation in the slow scan mode. The digital broadcast receiver according to (2), wherein the digital broadcast receiver is configured so as to be displayed on the screen.

  In the digital television receiver of the above (9), the scanning in the full scan mode and / or the local scan mode is slower than usual by the cooperation of the system controller and the tuner, particularly in the digital broadcast receiver of (2). Since the scanning operation in the slow scan mode executed at the predetermined timing is executed at a predetermined timing, the scanning operation in the slow scan mode is performed even under the condition that the detection of the viewable broadcast wave cannot be performed for a long time. Power is saved. In addition, in the scanning operation in the slow scan mode by the stem controller, the number of the physical channel corresponding to each broadcast wave targeted for detection at each corresponding time is displayed on the display unit, so that it can be viewed. The status of broadcast waves can be easily grasped.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings to be referred to below, for the sake of convenience, the main part that is the subject of the description is exaggerated as appropriate, and other than the main part is appropriately simplified or omitted.
FIG. 1 is a block diagram showing a configuration of a digital broadcast receiving apparatus as an embodiment of the present invention. This digital broadcast receiving apparatus takes the form of a digital television receiver attached to the car navigation apparatus, but illustration of a portion that functions exclusively as a car navigation apparatus is omitted.

  In FIG. 1, a tuner unit 120 that selectively extracts a signal of a specific frequency from a high frequency digital modulation signal of a digital television broadcast received by an antenna 110 and obtains a transport stream based on the extracted signal of the specific frequency; A decoder unit 130 for obtaining a video signal based on the transport stream obtained by the tuner unit 120 is provided, and the output of the decoder unit 130 includes character data formed by the OSD unit 140 and other various display data. The images are combined and supplied to a display unit 150 including, for example, a liquid crystal display, and an image is displayed.

  A system controller 160 is provided for comprehensively controlling each part of the apparatus including the tuner unit 120, the decoder unit 130, and the OSD unit 140. The system controller 160 is provided by the cooperation of the tuner unit 120 and the system controller 160. A memory unit 170 for holding data and other data as a detection result when a broadcast wave including a broadcast signal that can be viewed at the current location where the digital broadcast receiving apparatus is located, An operation unit 180 that receives an operation for performing the operation is connected. In addition, the memory unit 170 holds a local list table 171 in which channel information to be subjected to local scanning described later is recorded, and network ID data 172. The operation unit 180 is also provided with a power switch 181. The system controller 160 is configured to be supplied with a travel detection signal from a travel detector 190 that detects the travel status of a vehicle equipped with the digital broadcast receiving apparatus. The travel detector 190 itself is provided on the vehicle side, but may be provided in the digital broadcast receiving apparatus.

The configuration of the tuner unit 120 and the decoder unit 130 will be described in more detail. The tuner unit 120 includes a demodulation circuit, a deinterleave circuit, an error correction circuit, and the like, demodulates the selected digital modulation signal, outputs a transport stream, and supplies the output transport stream to the decoder unit 130.
The decoder unit 130 converts the supplied transport stream into a video stream such as MPEG2, an audio stream, PSI / SI (Program Specific Information / Service Information) and broadcast information (region identifier, service type, broadcast station identification, service A demultiplexer that separates the input signal into a number, a remote control key ID, etc., and obtains a quantization coefficient and a motion vector by decoding the input encoded signal, and performs motion compensation control based on inverse DCT transform and motion vector An MPEG2 decoder including a video decoder for generating video data is included.

  The OSD unit 140 includes an OSD (on-screen display) circuit and an adder. The OSD circuit outputs video data based on character information and color information instructed to be output from the system controller 160 to the adder. The adder performs processing for incorporating the video data from the system controller 160 into the received video data output from the decoding unit 130. With this OSD circuit, it is possible to display a menu screen and a receivable broadcast wave for channel selection (that is, a display as shown in FIG. 4 to be described later indicating a reception status detected by a scanning operation). .

The digital broadcast receiving apparatus of the present embodiment having the above configuration scans a frequency band in which a receivable broadcast wave may exist by the cooperation of the system controller 160 and the tuner unit 120. A scanning operation for detecting a broadcast wave including a broadcast signal that can be viewed at the current location where the apparatus is located is executed, and the reception status detected as a result of the execution is displayed on the display unit 150 via the OSD unit 140.

Furthermore, when the system controller 160 recognizes that the vehicle is in a traveling state based on a traveling detection signal supplied from a traveling detector 190 that detects the traveling state of the vehicle on which the digital broadcast receiving device is mounted. Control is performed so as to cut off the display of the digital television broadcast video and to display characters or patterns representing the reception status on the display unit.
Considering the special characteristics of in-vehicle use, it prevents the viewer from generating stress by cutting off the video display while moving, which is difficult to maintain a good reception state, and also prevents the video from being disturbed by the driver. It is possible to prioritize ensuring safety without displaying.

On the other hand, when a channel selection operation such as a stop is allowed by displaying a pattern of characters or icons indicating the reception status on the display unit, the channel selection is promptly performed based on the display. The operation can be performed.
On the other hand, by the cooperation of the system controller 160 and the tuner unit 120, the digital broadcast receiving apparatus is located by scanning the entire frequency band or the relatively wide frequency band in which a receivable broadcast wave may exist. Scanning operation in full scan mode that detects broadcast waves including broadcast signals that can be viewed at the current location and a relatively narrow frequency band that is part of the entire frequency band (a limited frequency band applied to a specific region) ) And a scanning operation in a local scan mode for detecting a broadcast wave including a broadcast signal that can be viewed at the current location is selectively executed.

  A symbolic display representing all broadcast waves including a viewable broadcast signal detected by the scanning operation in the local scan mode is displayed on the display unit 150 via the OSD unit 140. For this reason, it becomes possible to grasp | ascertain the situation of the broadcast wave containing the signal of the broadcast which can be viewed in the specific area where the said digital broadcast receiver is located in a list.

FIG. 2 is a flowchart showing the operation of the apparatus of FIG. 1 in the full scan mode.
When the apparatus is activated in response to an operation of turning on the power from the operation unit 180 in FIG. 1 at the beginning of using the digital broadcast receiving apparatus or after that, the channel number to be scanned is first set. The corresponding variable n is set to 1 (step S201). Next, a channel selection operation is attempted for channel n (ie, initially 1 and corresponding to channel 13 which is the first channel) (step S202). Next, an attempt is made to obtain a network ID for channel n targeted for channel selection in step S202 (step S203).

  It is determined whether or not the network ID has been acquired as a result of the execution of step S203 (step S204). When the network ID is acquired (step S204: Yes), the channel n (that is, initially 1 and 1) The data of the network ID is recorded for the channel 13 corresponding to the th channel (if the data has already been obtained, the data is rewritten with the newly acquired data (step S205).

After step S205, it is determined whether or not the variable n corresponding to the channel number has reached the rank N of the channel corresponding to the end scheduled for scanning (for example, 20 and this corresponds to channel 32) (step S205). Step S206).
As a result, when the variable n corresponding to the channel number has not reached the final channel number N scheduled for scanning (step S206: No), 1 is added to the current value of the variable n (step S207) and step S202. Return to.

On the other hand, when the network ID is not acquired in step S204 (step S204: No), the process skips to step S206 without passing through step S205.
Each time a network ID is acquired, the acquired data is stored in a predetermined form in the memory unit 170 as a network ID memory described with reference to FIG. 1 to create a local list table.
This local list table is a correspondence table between network IDs and reception channels (physical channels).

As described above with reference to FIG. 1, the network ID data 172 is also stored and held in the memory unit 170.
When it is determined in step S206 that the variable n corresponding to the channel number has reached the rank N of the channel corresponding to the end scheduled for scanning (for example, 20, which corresponds to channel 32) (step S206: Yes). ) Satisfies the scanning conditions in the full scan mode, such as satisfying the number of repetitions when the condition that the scan in the full scan mode is repeated, for example, for the sake of certainty is set. It is determined whether or not the condition is satisfied (step S208). When the scanning condition is satisfied (step S208: Yes), the scanning operation in the full scan mode is terminated.

Here, N is, for example, from 13 channels to a maximum of 62 channels, but may be up to 31 channels depending on circumstances.
On the other hand, when the scan condition is not satisfied (step S208: No), the process returns to step S201, and the operation from the beginning in the full scan mode is repeated.

FIG. 3 is a flowchart showing the operation in the local scan mode of the apparatus of FIG. First, the local list table formed while acquiring the network ID in the scanning process in the full scan mode described with reference to FIG. 2 is referred to (step S301).
Next, the channel number at the beginning of the local list table is set as a variable n corresponding to the channel number (step S302).

A channel selection operation is attempted for channel n set in step S302 (that is, the first channel listed in the local list table initially) (step S303). Next, an attempt is made to obtain a network ID for channel n targeted for channel selection in step S303 (step S304).
As a result of the execution of step S304, it is determined whether or not a network ID has been acquired (step S305). When the network ID is acquired (step S305: Yes), network ID data is newly acquired for that channel n. The data is rewritten (step S306).

Next, it is determined whether or not the variable n corresponding to the channel number has reached the channel number at the end of the local list table (step S307). As a result, when the variable n corresponding to the channel number has not reached the channel number at the end of the local list table scheduled for scanning (step S307: No), the value of the variable n is set to the next channel number in the local list table. (Step S308) and the process returns to step S303.
On the other hand, when the network ID is not acquired in step S305 (step S305: No), the process skips to step S307 without passing through step S306.

Each time the network ID is acquired, the local list table is updated with the acquired data.
When it is determined in step S307 that the variable n corresponding to the channel number has reached the channel number at the end of the local list table that is scheduled for scanning (step S307: Yes), the network is normally scanned by scanning in the local scan. It is determined whether or not the ID has been acquired (step S309). If the ID has not been acquired (step S309: No), the scanning operation in the local scan mode is terminated.

On the other hand, when the network ID is properly acquired (step S309: Yes), the process returns to step S301, and the processing in the local scan mode is repeated from the beginning.
As described above, the scanning operation in the full scan mode described with reference to FIG. 2 is to recognize a broadcast station that can be received at the point. For example, whether the point is the Osaka region or the Nagoya region. This is equivalent to identifying whether it is a Nagano area. In addition, the scanning operation in the local scan mode described with reference to FIG. 3 is to sequentially scan NHK 2 station and 4 commercial broadcast stations in the Nagano area, which should exist in that area. The result (reception status indicating reception quality) is displayed on the display unit 150. In this display, for example, the status of signals from each broadcasting station at a certain time in front of the Suwa station in the Nagano area is displayed.
In the in-vehicle digital broadcast receiving apparatus, the status of the received signal varies greatly depending on the location, so that there are some stations that are well received and some that cannot be received. This situation is particularly noticeable in the outdoors where there are many buildings. Corresponding to such a situation, by scanning at regular time intervals, stations that can be correctly received at the location can be displayed.

FIG. 4 is a diagram illustrating a display example when the display unit 150 of FIG. 1 performs display related to the scanning operation in the full scan mode.
FIG. 4A is a diagram illustrating a state in which each channel (each broadcast wave) to be scanned in the full scan mode is representatively displayed. Each channel (each broadcast wave) is represented by a corresponding symbol A, B, C, D, E, F, G, H, I, J, K, L, M, and is aligned horizontally along the bottom side of the screen. Are displayed in line. Corresponding to the symbol display of each of these channels, a rectangular icon indicating whether or not the network ID has been acquired is displayed on the lower side. These icons are displayed separately so that the color display is turned on for each channel (each broadcast wave) for which the network ID has been acquired, and the color display is turned off for those for which the network ID has not been acquired.

In the present specification, “lighting” corresponds to the case of high luminance display in the display screen, and “light off” corresponds to the case of low luminance display in the display screen. Further, the “color display” corresponds to the case of high luminance color display.
In addition, these icons are classified according to the color corresponding to each area to which they belong, and in the upper part of the screen, areas such as “Nagano Prefecture” and “Chukyo Wide Area” are displayed in the square icons with colors corresponding to each area. An indication is made.

In the example shown in the figure, the icons below the channel symbols B, C, D corresponding to “Nagano Prefecture” are displayed in the same color to indicate that the network ID has been acquired, and also corresponds to “Chukyo Wide Area”. The channel symbols H, I, and J are displayed in the same color to indicate that the network ID has been acquired.
Two triangular arrow keys facing left and right are displayed on the right side of the channel symbol display column, and each channel for which a network ID has been acquired by lighting a color icon by touching these arrow keys. About (each broadcast wave), it is comprised so that channel selection operation can be performed, moving a cursor display.

As described above, the system controller 160 in FIG. 1 determines whether the vehicle is in a traveling state based on a traveling detection signal supplied from a traveling detector 190 that detects the traveling state of the vehicle on which the digital broadcast receiving device is mounted. Is recognized, the display unit 150 is stopped from displaying the digital television broadcast video, and for example, control is performed to display characters or patterns representing the reception status as shown in FIG. 4A on the display unit. Execute.

Further, the system controller 160 is configured to allow a digital television broadcast channel selection operation when it is recognized that the vehicle is stopped based on a travel detection signal supplied from the travel detector 190. Therefore, the safety related to the traveling of the vehicle is not hindered, and an accurate tuning operation can be performed.
FIG. 4B is a diagram illustrating a state where each channel (each broadcast wave) to be scanned in the full scan mode is lit and displayed. Symbols A, B, C, D, E, F, G, H, I, J, K, L, and M that typically correspond to each channel (each individual broadcast wave) correspond to each scanning operation. The fact that it is a detection target at the time is performed by a lighting display as a symbolic display.

  In the example shown in the figure, A at the beginning of the order is a detection target, and this is recognized by lighting display. The lighting display changes in order of A → B → C → D... As the scanning operation progresses. On the other hand, the color display of each icon indicating that the network ID has been acquired under the channel symbols A, B, C, D,... Is continuously displayed. Therefore, the progress of the scanning operation can be easily monitored, and it is possible to clearly grasp which broadcast is in a viewable state.

FIG. 5 is a diagram showing a state in which each channel (each broadcast wave) to be scanned in the local scan mode is representatively displayed on the display unit 150 in FIG. Also in this mode, the meaning of display of each icon, symbol, etc. is the same as the display method described above with reference to FIG.
Corresponding to each channel symbol display A, B, C, D,..., A rectangular icon representing the presence / absence of network ID acquisition in color is displayed below it. These icons are displayed separately so that the color display is turned on for each channel (each broadcast wave) for which the network ID has been acquired, and the color display is turned off for those for which the network ID has not been acquired.

  In the case of FIG. 5A, the display of “Chukyo Wide Area”, which is the area to be scanned in the local scan mode at present, is lit in color, while the display of “Nagano Prefecture” is turned off. is doing. In other words, in this example, the display of the area with the history of scanning remains in the off state. Corresponding to “Chukyo Wide Area”, channel symbols H, I, and J are displayed in the same color to indicate that the network ID has been acquired.

Since the display showing the local area including each broadcast wave to be detected in the scanning operation in the local scan mode is displayed on the display unit, it is obvious at which area the scanning operation is performed in the local scan mode. It becomes.
In addition, regarding the symbol displays A, B, C, D,... Of each channel, the fact that they are the detection target at each corresponding time with the execution of the scanning operation is performed by lighting display as symbolic display. In the example shown in the figure, G in the middle rank is the detection target, and this is recognized by the lighting display.

In the case of FIG. 5 (B), only the display of “Chukyo Wide Area”, which is the area that is currently being scanned in the local scan mode, is lit in color, while the display of “Nagano Prefecture” And symbols A, B, C, D, E, and F representing channels that do not belong to the “Chukyo Wide Area”
There is no indication.

In other words, in this example, there is no display regarding areas that have been scanned but are not currently targeted for scanning. In the scanning operation in the local scan mode, a display showing only the local area including the broadcast wave to be detected at the current time point is displayed on the display unit. Therefore, the scanning operation in the local scan mode is performed for any region at the current time point. It will be obvious at a glance what will be done.
Note that the channel symbols H, I, and J are displayed in the same color in color corresponding to “Chukyo Wide Area” to indicate that the network ID has been acquired, which is the same as the display in the full scan mode of FIG.

  FIG. 6 is a flowchart showing the operation in the slow scan mode of the apparatus of FIG. First, the variable n corresponding to the channel number to be scanned is set to 1 (step S601). Next, a channel selection operation is attempted for channel n (ie, initially 1 and corresponding to channel 13 which is the first channel) (step S602). Next, an attempt is made to obtain a network ID for channel n targeted for channel selection in step S602 (step S603).

  It is determined whether or not the network ID has been acquired as a result of the execution of step S603 (step S604). When the network ID is acquired (step S604: Yes), the network ID data is recorded for the channel n (already When data is obtained, the data is rewritten with newly acquired data (step S605), and the slow scan is terminated.

On the other hand, when the network ID is not acquired in step S604 (step S604: No), the variable n corresponding to the channel number is the rank N of the channel corresponding to the end scheduled for scanning (for example, 20 and this is the channel 32). Is determined (step S606).
As a result, when the variable n corresponding to the channel number has not reached the final channel number N scheduled for scanning (step S606: No), 1 is added to the current value of the variable n (step S607) and step S602. Return to.

On the other hand, when the variable n corresponding to the channel number reaches the final channel number N scheduled for scanning (step S606: Yes), the slow scan is terminated.
Viewing in full scan mode and / or local scan mode is performed at a predetermined timing in slow scan mode, which is performed at a slower speed than usual, for example, in a long tunnel or in a multi-storey parking lot Even under conditions where possible broadcast waves cannot be detected over a long period of time, power saving is achieved by the scanning operation in the slow scan mode.

As described above, the recording or rewriting of the network ID data in the full scan mode, the local scan mode, and the slow scan mode described with reference to FIGS. This is performed when the operation of the broadcast receiving apparatus is started or when the reception is resumed after the slow scan.
At the start of the operation of the digital broadcast receiving apparatus, the network ID is recorded for the first time. When the full scan mode is executed after the scanning operation in the slow scan mode, for example, after moving from Tokyo to Nagano Prefecture, the ID of Tokyo is rewritten from the ID of Nagano Prefecture. If you are in a place where you cannot receive, such as in an underground parking lot, and you go outside, you will write the same ID again.

FIG. 7 is a diagram illustrating a display example when the display unit 150 of FIG. 1 performs display related to the scanning operation in the slow scan mode. The physical channel numbers 13, 13, 15, and 16 of each channel that is the target of the scanning operation in the slow scan mode are displayed, and the channel number that is the detection target at the present time (in this case, the channel number) 13) are sequentially lit and displayed.
Since the number of the physical channel corresponding to each individual broadcast wave to be detected at each corresponding time is displayed on the display unit, the status of the viewable broadcast wave can be easily grasped.

FIG. 8 is a flowchart showing an example of scan mode switching at the beginning of power-on in the apparatus of FIG.
In this example, when the power is turned on, the full scan mode described with reference to the flowchart of FIG. 2 is executed (step S801). It is determined whether or not the network ID is detected by the scanning operation in the full scan mode in step S801 (step S802). When the network ID is detected (step S802: Yes), the flowchart of FIG. The local scan mode described with reference to this is executed (step S803).

It is determined whether or not the network ID is detected by the scanning operation in the local scan mode in step S803 (step S804). When the network ID is detected (step S804: Yes), the local scan mode is repeated thereafter. (Step S803).
When it is determined in step S802 that the network ID has not been detected depending on the full scan mode (step S802: No), and when it is determined in step S804 that the network ID has not been detected depending on the local scan mode ( In any case, the scanning operation in the slow scan mode described with reference to the flowchart of FIG. 6 is executed (step S805).

    It is determined whether or not the network ID is detected by the scanning operation in the slow scan mode in step S805 (step S806). When the network ID is detected (step S804: Yes), the process returns to step S801, while the network is detected. When it is determined that the ID has not been detected (step S806: No), the slow scan mode is repeated (step S805).

  As described above, in the example described with reference to the flowchart of FIG. 8, initially, an operation of detecting a broadcast wave including a broadcast signal that can be viewed in the full scan mode is performed, and any of the broadcast signals that can be viewed is included. After the broadcast wave is detected, the mode shifts to the local scan mode (step S801 → step S802 → step S803). For this reason, the time required to automatically shift to the local scan mode from the point in time when conditions suitable for detecting broadcast waves including a broadcast signal that can be viewed are established, and the detection result is generally shortened, and power is saved. Figured.

  In addition, an operation of detecting a broadcast wave including a broadcast signal that can be viewed in the full scan mode is initially performed. When a broadcast wave including a broadcast signal that can be viewed is not detected in the full scan mode, the slow scan mode is selected. (Step S801 → Step S802 → Step S805). For this reason, it is possible to detect any broadcast wave including a viewable broadcast signal even under a condition in which a broadcast wave including a viewable broadcast signal is not detected depending on the normal full scan mode. Become.

  Further, when any broadcast wave including a viewable broadcast signal is detected by shifting to the slow scan mode, the mode shifts to the full scan mode (step S805 → step S806 → step S801), and quick channel selection is performed. A return to operation is performed, and a characteristic excellent in responsiveness to changes in the reception status is realized.

FIG. 9 is a diagram for explaining a scan interval in each scan mode.
In full scan mode, all channels are scanned at intervals of about 1 second. This may be repeated a plurality of times. Thereafter, a scanning operation is performed in the local scan mode after an interval of about 10 seconds.

Each channel scan interval in the local scan mode is about 1 second. This is repeated as a normal state. When the slow scan mode is entered, a predetermined channel scan is performed at an interval of about 10 seconds for each channel. This is repeated, but the repetition interval is about 100 seconds.
Therefore, in the slow scan mode as compared with the normal scanning mode, the frequency of channel detection is roughly one-tenth, and power saving is achieved according to this time interval.

  In the full scan mode, all channels assigned to terrestrial digital broadcasting, that is, 13 to 62 channels in the UHF band are sequentially scanned. However, in actuality, all of channels 13 to 62 are not used (in each region, about 10 to 15 channels at most and within 32 channels), and appropriate channels (for example, 32 channels) ) Is practically sufficient.

The example shown is drawn in the range where all the channels in the Tokyo suburbs and the Kanto area are scanned, and the reason why it jumps to the 20th channel after the 18th channel is because 19th channel is not used in Tokyo. . As described above, in the local scan mode, a part of the frequency band to be scanned in the full scan mode is received.
As described above with reference to the flowchart of FIG. 2, the full scan mode may be repeatedly executed a predetermined number of times in order to surely perform the detection.

In the full scan mode, each channel may be sequentially scanned, and the odd channel and the even channel may be alternately scanned.
In the slow scan mode, it is considered sufficient to scan up to 32 channels. Also in the slow scan mode, each channel may be scanned sequentially, and the odd channel and even channel may be alternately scanned.

It is a block diagram showing the structure of the digital broadcast receiver as embodiment of this invention. 2 is a flowchart illustrating an operation in a full scan mode of the apparatus of FIG. 1. 2 is a flowchart showing an operation in a local scan mode of the apparatus of FIG. 1. It is a figure showing the example of a display in the case of performing the display regarding the scanning operation | movement in a full scan mode in the display part of FIG. FIG. 2 is a diagram illustrating a state in which each channel to be scanned in the local scan mode is representatively displayed on the display unit in FIG. 1. It is a flowchart showing the operation | movement in slow scan mode of the apparatus of FIG. It is a figure showing the example of a display in the case of performing the display regarding the scanning operation | movement in slow scan mode in the display part of FIG. 2 is a flowchart showing an example of switching of scan modes at the beginning of power-on in the apparatus of FIG. It is a figure for demonstrating the scan interval in each scan mode.

Explanation of symbols

DESCRIPTION OF SYMBOLS 110 ... Antenna 120 ... Tuner part 130 ... Decoder part 140 ... OSD part 150 ... Display part 160 ... System controller 170 ... Memory part 180 ... Operation part 190 ... Travel detector

Claims (9)

  A tuner unit that selectively extracts a signal of a specific frequency from the received high-frequency digital modulation signal of the digital television broadcast and obtains a transport stream based on the extracted signal of the specific frequency, and a transformer obtained by the tuner unit Decoder unit for obtaining video signal based on port stream, system controller for comprehensively controlling each unit including the tuner unit and the decoder unit, and a display unit for displaying video display and reception status of the digital television broadcast The system controller and the tuner unit scan together a frequency band in which a receivable broadcast wave may be present by the cooperation of both of the system controller and the tuner unit. Can be viewed at the current location where the digital broadcast receiver is located. It is configured to execute a scanning operation for detecting a broadcast wave including a broadcast signal, and to display a reception status detected as a result of the execution on the display unit, and the system controller includes the digital broadcast receiving device When it is recognized that the vehicle is in a traveling state based on a traveling detection signal supplied from a traveling detector that detects the traveling state of the vehicle equipped with a digital television broadcast, the reception state is cut off. A digital broadcast receiving apparatus configured to execute control so as to display characters or patterns representing the characters on the display unit.   A tuner unit that selectively extracts a signal of a specific frequency from the received high-frequency digital modulation signal of the digital television broadcast and obtains a transport stream based on the extracted signal of the specific frequency, and a transformer obtained by the tuner unit Decoder unit for obtaining video signal based on port stream, system controller for comprehensively controlling each unit including the tuner unit and the decoder unit, and a display unit for displaying video display and reception status of the digital television broadcast And the system controller and the tuner unit are capable of receiving all broadcast frequencies that can be received by the combined operation of the system controller and the tuner unit. The digital broadcast receiver is positioned by scanning a relatively wide frequency band. Scanning operation in a full scan mode that detects broadcast waves including broadcast signals that can be viewed at the current location and scanning at a relatively narrow frequency band that is a part of the entire frequency band allows viewing at the current location And selectively performing a scanning operation in a local scan mode for detecting a broadcast wave including a broadcast signal, and all broadcast waves including a viewable broadcast signal detected by the scanning operation in the local scan mode. A digital broadcast receiving apparatus configured to display a symbolic display representing on the display unit.   The system controller is configured to display a symbolic display representing a broadcast wave including a viewable broadcast signal detected by the scanning operation on the display unit with a cursor display for selecting the broadcast. The digital broadcast receiving apparatus according to claim 1, wherein the digital broadcast receiving apparatus is provided.   The system controller is configured to allow a digital television broadcast channel selection operation when it is recognized that the vehicle is stopped based on a travel detection signal supplied from a travel detector. The digital broadcast receiver according to claim 1.   2. The system controller according to claim 1, wherein the system controller is configured to display on the display unit a symbolic display representing each broadcast wave to be detected at each corresponding time point by the scanning operation. 3. The digital broadcast receiver according to any one of 2 above. The system controller displays a symbolic display representing each broadcast wave detected at each corresponding time in the scanning operation in the local scan mode on the display unit, and includes a viewable broadcast signal. 3. The digital broadcast receiving apparatus according to claim 2, wherein a symbolic display representing a broadcast wave is continuously displayed on the display unit.   The system controller is configured to display on the display unit a local area including each broadcast wave to be detected in the scanning operation in the local scan mode. The digital broadcast receiver described in 1.   The system controller is configured to display on the display unit only a local area including a broadcast wave to be detected at a current time point in a scanning operation in the local scan mode. Item 3. The digital broadcast receiver according to Item 2.   The system controller and the tuner unit further perform scanning operation in a slow scan mode in which scanning in the full scan mode and / or the local scan mode is performed at a lower speed than usual by a cooperation of both at a predetermined timing. The system controller is configured to execute the scanning operation in the slow scan mode, and displays the number of the physical channel corresponding to each broadcast wave to be detected at each corresponding time on the display unit. The digital broadcast receiving apparatus according to claim 2, configured as described above.

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