JP2007195237A - Digital broadcast receiver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a digital broadcast receiver enabling a small display means having low resolution to display the contents of a digital broadcast program, especially, a data broadcast program. <P>SOLUTION: The broadcast receiver comprises means for calculating a thinning coefficient of display pixel data for allowing the number of vertically and horizontally displayed pixels of an original image to correspond to the number of vertically and horizontally screen pixels; means for executing thinning processing of the display pixel data so that the entire contents of the original image can be displayed in the display means on the basis of the calculated thinning coefficient; means for generating an image signal on the basis of the display image data subjected to the thinning processing; character data storing means storing data about characters; means for deciding the size of the characters to be displayed on the display means on the basis of the character size designated in the original image and the thinning coefficient; and means for reading characters corresponding to the decided character size from the character data storing means, and not thinning the read characters but drawing them after completion of the thinning processing of the display pixel data. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to a digital broadcast receiver, and more particularly to a digital broadcast receiver capable of displaying a broadcast program on a display means based on a demodulated signal obtained by demodulating a received broadcast wave.

The features of BS and CS digital broadcasting, which are currently being broadcast in Japan, include various channels such as multi-channel, high-definition and high-quality sound through high-definition broadcasting, and data broadcasting.
One example is the enhancement of functionality that can provide services. Digital broadcast receivers for realizing these functions and television devices incorporating digital broadcast receivers have been developed.

To faithfully reproduce the high-definition broadcast video, which is the biggest feature of digital broadcasting,
Since a high-definition display device compatible with the video format of high-definition broadcasting is required, the screen size and resolution of the display device are increasing along with improvements in the functions of digital broadcast receivers. As the display device, a large display of usually 30 inches or more is employed.

Also, in data broadcasting in digital broadcasting, multimedia encoding suitable for data broadcasting for controlling the display and synthesis of various monomedia such as characters, graphics, still images, video, and sound is controlled. A method is defined. For example, BS digital broadcasting employs a description language called BML (Broadcast Markup Language) to which functions necessary for broadcasting are added, based on XML (eXtensible Markup Language) that is compatible with the Internet.
Video / data signals of data broadcast programs described in BML are multiplexed together with video and audio signals of other programs and sent from the broadcasting station side.

The digital broadcast receiver is equipped with a BML browser which is a tool for interpreting and displaying BML, and the BML received by the BML browser is interpreted and displayed on the display means. .

For example, in the HD mode (display mode with an aspect ratio of 16: 9), a data broadcast program described in BML is sent as information having a resolution of 540 × 960 pixels. Then, at the time of program display processing in the digital broadcast receiver, the vertical and horizontal display pixel numbers are doubled and converted into a video format of vertical 1080 × horizontal 1920 pixels and displayed. .

Therefore, when a digital broadcast receiver is connected to a large-screen, high-definition display device that supports high-definition broadcasting and a data broadcast program including various mono-media is displayed, even small characters, symbols, figures, etc. are clearly displayed. Can be projected.

In addition to BS and CS digital broadcasting, preparations for terrestrial digital broadcasting are currently underway. In terrestrial digital broadcasting, a modulation system that is resistant to multipath interference, which is a cause of ghost problems in current analog broadcasting, is adopted. Therefore, digital broadcasting receivers for mobile TVs and mobile Digital broadcast receivers are said to be capable of high-quality reception.

By the way, there is still a long-standing need to install a small display in the car and watch television broadcasting. Even if the current analog broadcasting is switched to terrestrial digital broadcasting, watching television broadcasting in the car Needs remain high. Moreover, as described above, it is said that more stable radio wave reception is possible than the current analog broadcasting, and the disturbance of the display image such as a ghost failure is reduced. I think that the.

It can be easily guessed that many of these users want to be able to use high-performance services in the same way as when viewing digital broadcasts at home, even when viewing digital broadcasts in the car. The desire to view a data broadcast program, which is one of the characteristics of digital broadcasting even in the car, seems to be high.

However, there is a problem that the installation place of the display is limited in the car, and it is difficult to install a large screen display for home use, which is inevitably small (less than 10 inches) and low in resolution ( In most cases, a display is installed, and when a data broadcast program is selected, an image synthesized with various mono-media is displayed on a small, low-resolution display. Will be.

Therefore, when a data broadcast program composed of display pixels of a video format compatible with high-definition broadcasting is displayed on a small, low-resolution display, characters and the like are displayed small because the display itself is small. In addition, since the number of screen pixels of the display is small and the aspect ratio of the number of screen pixels is often different from that of the video format, when the display number of pixels of the video format is appropriately thinned and displayed, There is a problem that a part of the character is missing or the content is distorted and displayed, making it difficult to view and grasping the content.

Means for solving the problems and their effects

The present invention has been made in view of the above problems, and makes it possible to display a digital broadcast program, in particular, the contents of a data broadcast program in an easy-to-view manner on a small display device with a low resolution (small number of screen pixels). An object of the present invention is to provide a digital broadcast receiver capable of performing the above-described operation.

To achieve the above object, a digital broadcast receiver (1) according to the present invention includes a receiving means for receiving a broadcast wave, a demodulating means for demodulating the broadcast wave received by the receiving means, and a demodulating means by the demodulating means. A digital broadcast receiver comprising an image signal output means for outputting an image signal to a display means based on the demodulated signal, wherein the vertical and horizontal screens of the display means indicate the number of vertical and horizontal display pixels of the original image based on the demodulated signal. Based on the decimation coefficient calculation means for calculating the decimation coefficient of the display pixel data to correspond to the number of pixels, and the decimation coefficient calculated by the decimation coefficient calculation means,
Thinning processing means for thinning display pixel data so that the entire display content of the original image is displayed on the display means, and an image signal based on the display pixel data thinned by the thinning processing means. An image signal generating means for generating; a character data storing means for storing data relating to a font and size of the character; a character size designated by the original image and a character size to be displayed on the display means; Display character size determining means determined based on the thinning coefficient, and a character corresponding to the character size determined by the display character size determining means is read from the character data storage means, and the display pixel data by the thinning processing means is read out. And a first character drawing unit for drawing the read character without performing the thinning process after the thinning process is completed.

According to the digital broadcast receiver (1), the entire display content of the original image based on the demodulated signal can be displayed without distortion even if the display means is small and has a small number of screen pixels and a low resolution. Can do. Therefore, the viewer (user) can visually recognize the entire display content without feeling uncomfortable even on a small and low-resolution screen. Further, the size of the character to be displayed on the display means is determined based on the character size specified in the original image and the thinning coefficient, and the character corresponding to the determined character size is read from the character data storage means. Since the read and read characters are drawn without being thinned out, the display means is small, and even if the resolution is low, it is possible to eliminate partial omission and collapse of the characters due to thinning, and to display the characters clearly This makes it possible to display characters that are easy to read for viewers.

In the digital broadcast receiver (2) according to the present invention, in the digital broadcast receiver (1), a character having a size corresponding to the character size determined by the display character size determining means is stored in the character data storage. When not stored in the means, character size selection means for selecting a character having a size close to the character size from the characters stored in the character data storage means is provided.

According to the digital broadcast receiver (2), there is no need to perform a process of calculating the character size according to the character size determined by the display character size determining means, and the character having a size close to the character size. By using, the speed of drawing characters can be improved.

The digital broadcast receiver (3) according to the present invention comprises a receiving means for receiving broadcast waves, a demodulating means for demodulating broadcast waves received by the receiving means, and the demodulator in the digital broadcast receiver (1). A digital broadcast receiver comprising image signal output means for outputting an image signal to the display means based on the demodulated signal demodulated by the means, wherein the display means displays the number of vertical and horizontal display pixels of the original image based on the demodulated signal. A decimation coefficient calculation means for calculating a decimation coefficient of display pixel data to correspond to the number of vertical and horizontal screen pixels, and the entire display content of the original image based on the decimation coefficient calculated by the decimation coefficient calculation means Thinning processing means for thinning display pixel data so as to be displayed on the display means, and display image data based on the display pixel data thinned by the thinning processing means. Image signal generating means for generating a signal, character typeface data storing means for storing character typeface data, character size designated by the original image and character size to be displayed on the display means The display character size determining means determined based on the thinning coefficient, and the character font data to be displayed are read from the character font data storage means, the vector operation is performed based on the font data, and the display is performed. Character creating means for creating a character having a character size determined by the character size determining means, and display pixel data by the thinning processing means
And second character rendering means for rendering the character created by the character creating means without performing the thinning process after the character thinning process is completed.

According to the digital broadcast receiver (3), the typeface data of characters to be displayed on the display means is displayed.
Data is read from the character type data storage means, a character having a character size determined by vector operation is created based on the read type data of the character, and the character is drawn without being thinned out. Therefore, the display means is small, and even if the resolution is low, it is possible to eliminate partial omission and collapse of the character due to the thinning process, and the character can be displayed clearly. Further, it can be displayed as an easy-to-read character with an appropriate character size by vector calculation, and only the font data of the character need be stored, and the amount of stored character data can be reduced.

The digital broadcast receiver (4) according to the present invention includes the digital broadcast receiver (1) to
In any one of (3), an input unit capable of designating an arbitrary position on the screen of the display unit is connected, and an image signal is generated by the image signal generation unit based on the thinned display pixel data. And when the position designation signal from the input means is detected, the display content identification means for identifying the content displayed at the position designated by the position designation signal, and the display content identification means First redrawing means for cutting out the number of vertical and horizontal screen pixels of the display means from the number of vertical and horizontal display pixels of the original image about the position of the displayed content and redrawing without performing thinning processing. It is characterized by having.

According to the digital broadcast receiver (4), from the state where the entire display content is displayed on the display means, the display content at the position specified via the input means can be partially enlarged and displayed. it can. Therefore, even if the display content is difficult to see, it is possible to easily enlarge and display the portion simply by specifying the desired position via the input means, and the display means is small. However, it is possible to make the contents easy to see by displaying the display contents partially enlarged.

Further, in the digital broadcast receiver (5) according to the present invention, in the digital broadcast receiver (4), the first redrawing unit further extracts the region from the region cut out by the number of vertical and horizontal screen pixels of the display unit. The display pixel data thinned by a predetermined thinning coefficient is redrawn so that the display area of the display content is expanded step by step until the entire display content is displayed. Yes.

According to the digital broadcast receiver (5), the display area of the display content is gradually increased from a partially enlarged display state cut out by the number of vertical and horizontal screen pixels of the display means to a state where the entire display content is displayed. For example, in the partial enlarged display, when the content is enlarged too much, it can be displayed in an appropriate size that is easy to read according to the content. The contents around the display portion can be displayed in an easy-to-read manner.

The digital broadcast receiver (6) according to the present invention further comprises a thinning coefficient setting means that allows a user to set a thinning coefficient of the display pixel data in the digital broadcast receiver (4). The first redrawing means further performs display pixel data obtained by thinning out the data of the number of display pixels in the vertical and horizontal directions of the original image with the thinning coefficient set by the thinning coefficient setting means.
It is characterized by redrawing the data.

According to the digital broadcast receiver (6), the user can set an arbitrary thinning coefficient by the thinning coefficient setting means. Further, since the display pixel data obtained by thinning out the data of the number of display pixels in the vertical and horizontal directions of the original image with the set thinning coefficient is redrawn, it is cut out by the number of screen pixels in the vertical and horizontal directions of the display means. The display contents can be displayed so as to be easily sized according to the user's preference from the partially enlarged display state.

The digital broadcast receiver (7) according to the present invention includes the digital broadcast receiver (4) to
In any one of (6), after the predetermined time has elapsed from when the first redrawing means redraws without performing thinning processing by the number of vertical and horizontal screen pixels of the display means, the entire display content is displayed. The display pixel data thinned by the thinning coefficient calculated as described above is redrawn.

According to the digital broadcast receiver (7), it is possible to return to the state in which the entire display content is displayed without any special operation by the user, and the number of operations performed by the user can be reduced.

In the digital broadcast receiver (8) according to the present invention, the digital broadcast receiver (7) further comprises first redrawing time setting means for allowing the user to set the predetermined time to an arbitrary time. It is characterized by having.

According to the digital broadcast receiver (8), the redraw time setting means allows the user to set the predetermined time to an arbitrary time, and a desired time can be set according to the usage state of the user. It becomes.

Further, the digital broadcast receiver (9) according to the present invention is based on vehicle speed information capturing means capable of capturing vehicle speed information and vehicle speed information captured by the vehicle speed information capturing means in the digital broadcast receiver (7). And a second redrawing time setting means for setting the predetermined time.

According to the digital broadcast receiver (9), the predetermined time can be set by the redraw time setting means based on the vehicle speed information taken in by the vehicle speed information taking means. At 0), it is relatively safe to look at the screen, so the predetermined time is lengthened to make it easier to check the contents. On the other hand, if the vehicle is running, the predetermined time is shortened and the screen is not watched. Thus, safety can be improved.

Further, the digital broadcast receiver (10) according to the present invention is the digital broadcast receiver (5).
In any one of (9) to (9), when a predetermined input operation signal is detected from the input means, a display area size holding means for holding a display area size of display content when the input operation signal is detected It is characterized by having.

According to the digital broadcast receiver (10), the user can read the display content in the retained display area size without worrying about switching the display area size, and the display contents can be sufficiently confirmed. If it is not possible, the operation of repeatedly displaying is unnecessary.

The digital broadcast receiver (11) according to the present invention includes the digital broadcast receiver (10).
), When the display area size when the input operation signal is detected is held,
Further, when a predetermined input operation signal is detected from the input means, the display area of the display content is gradually increased from the display area size to an area size cut out by the number of screen pixels in the vertical and horizontal directions of the display means. And a second redrawing means for redrawing the display pixel data thinned by a predetermined thinning coefficient so as to narrow the image.

According to the digital broadcast receiver (11), the display area size is maintained in a stepwise manner until the area size is cut out and displayed by the number of vertical and horizontal screen pixels of the display means. Since the display area of the display contents is narrowed, the display contents can be displayed in a partially enlarged manner. For example, when the user wants to overlook the contents without checking the contents well and want to enlarge the contents again, the display contents can be displayed again. Can be enlarged and displayed, and the overlooked contents can be immediately enlarged and confirmed, which is convenient for the user.

The digital broadcast receiver (12) according to the present invention includes the digital broadcast receiver (10).
), When the display area size when the input operation signal is detected is held,
Further, when a predetermined input operation signal is detected from the input means, the display area of the display content is narrowed to be larger than the area size cut out from the display area size by the number of vertical and horizontal screen pixels of the display means. A third redrawing means for redrawing the display pixel data thinned by the thinning coefficient is provided.

According to the digital broadcast receiver (12), the display content can be partially enlarged and displayed more than the size of the display content which is cut out by the number of vertical and horizontal screen pixels of the display means and partially enlarged. For example, it can be used to check the contents of small characters and small patterns that are difficult to see even with partial enlargement display by cutting out only the number of pixels of the screen, and display the detailed display contents so that it is easy to read Can be made.

The digital broadcast receiver (13) according to the present invention includes the digital broadcast receiver (10).
), When a predetermined input operation signal is detected from the input means, a character string designation judging means for judging whether or not the character string on which the input operation signal is displayed is designated;
Speech synthesis means for synthesizing speech from data of the designated character string when the character string designation judgment means judges that the character string on which the input operation signal is displayed is designated; Voice output processing means for performing output processing of the voice synthesized by the voice synthesis means.

According to the digital broadcast receiver (13), since the display character string designated through the input means is synthesized by voice and output, the user watches the screen in order to read the displayed content. The content of the designated character string can be grasped by the voice read out. In particular, when employed for in-vehicle use, safety during driving can be improved.

The digital broadcast receiver (14) according to the present invention includes the digital broadcast receiver (13).
), An audio output stopping unit is provided for stopping the output of the audio when a predetermined input operation signal is detected from the input unit during the output of the audio output processed by the audio output processing unit. It is characterized by.

According to the digital broadcast receiver (14), the voice output stop means can stop reading out the designated character string by voice. For example, although the voice reading is started, a wrong character string is designated. If the content is undesired or unnecessary, the reading can be stopped immediately, and the user can efficiently listen only to the content that he / she wants to hear.

Embodiments of a digital broadcast receiver according to the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram schematically showing a main part of a digital broadcast receiver according to the embodiment (1).

The tuner 1 tunes and amplifies the broadcast wave desired by the user from the received radio wave received by the antenna 1a, and includes a high-frequency amplifier circuit, a tuning circuit, and the like. The demodulator 2 demodulates the received wave tuned by the tuner 1 and outputs a digital signal. For example, in terrestrial digital television broadcasting, OFDM (Orthogonal Frequency Div)
ision Multiplexing) includes an OFDM demodulation circuit for OFDM-demodulating a modulated broadcast wave.

The TS (Transport Stream) decoding unit 3 decodes the OFDM demodulated digital signal, that is, transmission error prevention processing, compression processing, and the like before modulation at the broadcasting station.
The digital signal that has been subjected to the coupling process is returned to the original digital signal, and is constituted by a logic circuit, a digital signal processor, and the like. The digital signals decoded by the TS decode unit 3 are respectively used as audio data, video data, and data broadcasting data as an audio decode unit 4 and a video decode unit. 5 and output to the BML decode unit 6.

The audio decoding unit 4 decodes audio data from the TS decoding unit 3, that is, data corresponding to transmission error prevention processing, compression processing, etc. applied to the audio data. -Digital operation processing such as restoration processing and decompression processing of data is performed to restore original voice data, and includes a logic circuit, a digital signal processor, and the like. The audio signal output from the audio decoding unit 4 is subjected to digital / analog conversion and power amplification (not shown), and is output from the speaker 14 as audio.

The video decode unit 5 decodes the video data from the TS decode unit 3, that is, data corresponding to transmission error prevention processing, compression processing, etc. applied to the video data. -Digital operation processing such as restoration processing and decompression processing of data is performed to restore original video data, and includes a logic circuit, a digital signal processor, and the like.

The video signal output from the video decoding unit 5 is subjected to processing such as synthesis / switching processing with other image data by the adder 7 and is connected via a connection terminal (not shown). It is displayed on a small display 15 composed of a liquid crystal display device or the like.

The BML decode unit 6 is a data broadcasting data described in BML from the TS decode unit 3.
Data decoding, that is, transmission error prevention processing applied to data broadcasting data,
It performs digital operation processing such as data error restoration processing and decompression processing corresponding to compression processing, etc., and restores the original data broadcasting data (data described in BML). It includes a logic circuit, a digital signal processor, and the like. The restored data broadcast data (BML document) is processed by the CPU 9 by the BML browser stored in the ROM 10, and a drawing processing command is supplied to the drawing processing unit 8.

The drawing processing unit 8 is based on a video / data signal for data broadcasting output from the BML decoding unit 6 and a drawing processing command supplied from the CPU 9. The display pixel data that has been thinned out is subjected to thinning processing of display pixel data, redrawing processing of character data, synthesis processing with other image data such as character graphics and still images, etc. An image signal (also referred to as drawing data) is generated based on the VRAM (not shown) built in the drawing processing unit 8
The drawing data is written into the VRAM, and the drawing data written in the VRAM is output to the small display 15 via the adder 7, and is constituted by a drawing processor or the like.

The microcomputer controls the operation of each part of the digital broadcast receiver. The microcomputer is a central processing unit (CPU) 9 that performs arithmetic processing, and a tool that interprets and displays BML documents. ROM 10 storing various data such as various programs such as a display control program executed by a certain BML browser or drawing processing unit 8 and data such as character type and size, and temporary storage of various data It includes a RAM 11 and the like that perform the above.

Also, a modem 12 is connected to the bus line BL, and the digital broadcast receiver is used for communication with the outside, for example, communication with a digital television broadcast station, or program data and download from Internet contents. Data (including programs and the like) can be obtained.

Further, an input / output interface (I / O) 13 is connected to the bus line BL so that it can be connected to an external device. For example, an input signal from a touch panel 16 provided on the small display 15 is taken in and an operation corresponding to the input signal is performed. The user operates the touch panel 16 to receive a digital broadcast. It is possible to cause the machine to perform a desired operation.

Next, a method for displaying a data broadcast program on the small display 15 will be described with reference to FIG. The data broadcasting program includes additional data broadcasting that complements television broadcasting and audio broadcasting, and independent data broadcasting that is independent of television broadcasting and audio broadcasting. Video and data signals for broadcasting and independent data broadcasting are transmitted as data described in BML.

FIG. 2A is an explanatory diagram for explaining an example of display pixel data of a received data broadcast program. FIG. 2B shows the data broadcast program of the display pixel data shown in FIG.
The display example when it is made to display on the small display 15 which has the screen pixel number of 0x side 480 is shown. FIG. 2C shows a display example when the data broadcast program of the display pixel data shown in FIG. 2A is displayed on the small display 15 having a screen pixel number of 270 × 480. Is shown.

The display pixel data of the data broadcast program shown in FIG. 2A is the BML display mode is HD mode (vertical 540 × horizontal 960 pixels), and is doubled vertically and horizontally during display processing. Thus, the number of display pixels in the vertical and horizontal directions of the original image can be converted into a video format of vertical 1080 × horizontal 1920 pixels and displayed.

Such an original image is a data broadcast program having a display pixel number of 1080 × height 1920 and shown in FIG.
) Shown in FIG. 2 (c) or 270 × horizontal 480 shown in FIG. 2 (c), the image is displayed on the small display 15 having an overwhelmingly small number of screen pixels. Therefore, the display pixel data must be thinned and displayed, and a thinning coefficient is calculated for this purpose.

In this case, the thinning coefficient is obtained by dividing the vertical and horizontal screen pixel count of the small display 15 by the vertical and horizontal display pixel count (1080 × horizontal 1920) of the data broadcast program as the original image. This is calculated as the ratio of the number of display pixels in the vertical and horizontal directions of the data broadcast program when the number of pixels is 1.

In the case of the small display 15 having the number of screen pixels of 240 × 480 shown in FIG. 2B, the thinning coefficient in the vertical direction is 240/1080 = 1 / 4.5, and the thinning coefficient in the horizontal direction is 480/1920 = 1/4. If the vertical and horizontal thinning coefficients do not have the same value in this way, the vertical 1080 × horizontal 1920 without changing the aspect ratio of the entire content of the data broadcast program.
In order to facilitate the thinning process of the display pixel data of the pixels, the thinning coefficient is corrected so that the denominator becomes the same integer value in both vertical and horizontal directions. That is, in this case, the vertical / horizontal thinning coefficient is 1/5.
To correct.

By this correction, on the small display 15, vertical 1080/5 = 216 pixels, horizontal 192
With 0/5 = 384 pixels, the entire contents of the thinned program can be displayed without distortion without changing the aspect ratio of the data broadcast program.

In FIG. 2B, a blank area is set so that a blank area (shaded area) where the program content is not displayed becomes a single color filled image. The extra white may be set according to the viewer's preference. For example, an extra white setting screen is provided, and each color of R (red), G (green), and B (blue) is 8 bits. It is also possible to set any R, G, B value so that it can be displayed in 256 gradations, or it is possible to provide a setting screen to select a favorite color from preset color schemes It is.

In addition, data broadcasting programs contain a lot of information such as characters and graphics, and when the display pixel data is simply thinned and displayed, some of the characters and graphics may be missing. In this embodiment, the character size for display is determined by multiplying the character size specified by BML by the thinning coefficient calculated by the above method. .

Then, a character having a size corresponding to the determined character size for display is read from a font ROM (not shown) in the ROM 10, and the read character is not thinned out on the drawing data written in the VRAM. It is designed to be overwritten.

For example, the character size specified in the BML document is 30 dots (vertical 30 dots, horizontal 30
Dot), the display character size is converted to 30/5 = 6 dots, and the 6-dot character is read from the font ROM and overwritten without thinning processing on the thinned drawing data. . In addition, when there is no character corresponding to the converted character size in the font ROM, a character having a size close to the character size is read from the font ROM.

In addition to the above-described multiplication method, the display character size determination method is based on a table storing display character size data using the designated character size and the thinning coefficient as parameters. A reading method or the like can also be employed.

In the case of the small display 15 having the screen pixel number of 270 × vertical 480 × horizontal 480 shown in FIG. 2C, the thinning coefficient in the vertical direction is 270/1080 = 1/4, and the thinning coefficient in the horizontal direction is 480 / It is calculated that 1920 = 1/4. As described above, when both the vertical and horizontal thinning coefficients have the same denominator integer value, the value is used as the thinning coefficient.

Therefore, on the small display 15, vertical 1080/4 = 270 pixels, horizontal 1920
/ 4 = 480 pixels, the entire program content thinned out without changing the aspect ratio of the original image of the data broadcast program can be displayed without generating a blank area as shown in FIG. . Further, the character display is performed by determining the character size for display by the same processing as described in FIG. 2B, reading out the character having a size corresponding to the character size for display from the font ROM, and performing the thinning process. The drawn data is overwritten without being thinned out.

As another character drawing method, only the font data of characters is stored in the font ROM, the font data of characters to be displayed is read, and vector calculation is performed based on the font data. Then, a character having a character size determined by the same processing as described above may be created, and thereafter, the character may be overwritten on the thinned drawing data in the same manner as described above. In this case, it can be displayed as an easy-to-read character with an appropriate character size by vector calculation,
Further, it is only necessary to store only the character type data, and the amount of stored character data can be reduced.

Next, the display processing operation of the data broadcast program performed by the CPU 9 in the digital broadcast receiver according to the embodiment (1) will be described based on the flowchart shown in FIG. This process is executed when a data broadcast program is selected.

First, in step S1, the data of the vertical and horizontal display pixel numbers of the data broadcast program as the original image specified by BML and the data of the vertical and horizontal screen pixel numbers of the small display 15 are fetched.
Proceed to step S2.

In step S2, the number of vertical and horizontal display pixels of the data broadcast program is compared with the number of vertical and horizontal screen pixels of the small display 15 to calculate a thinning coefficient, that is, the number of vertical and horizontal screen pixels is set to 1, respectively. In this case, the process of obtaining the ratio of the number of display pixels in the vertical and horizontal directions of the data broadcast program “1 / the ratio of the number of display pixels” is performed in the vertical and horizontal directions, and the process proceeds to step S3.

In step S3, it is determined whether or not the calculated vertical and horizontal thinning coefficients are both equal integers. If it is determined that both vertical and horizontal are equal integers, the process proceeds to step S5. On the other hand, if it is determined in step S3 that the thinning coefficient is not equal to one integer in both the vertical and horizontal directions, the process proceeds to step S4.

In step S4, a process of correcting the denominator value to an integer value rounded off is performed so that the decimation factor becomes 1 / integer in both the vertical and horizontal directions.

In step S5, a process of calculating a display pixel size for displaying the entire contents of the data broadcast program on the small display 15 is performed based on the calculated thinning coefficient, and step S6.
Proceed to

In step S6, it is determined whether or not the display pixel size is the same as the screen pixel size of the small display 15, and if it is determined that the display pixel size is the same as the screen pixel size of the small display 15, the process proceeds to step S9. .

On the other hand, if it is determined in step S6 that the display pixel size is not the same as the screen pixel size of the small display 15, the process proceeds to step S7. In step S7, the display pixel size is compared with the screen pixel size to calculate a blank area. Processing is performed, and the process proceeds to step S8. In step S8, a process for setting the fill color of the margin area is performed, and then the process proceeds to step S9.

In step S9, the display-related data including the calculated thinning coefficient, blank area, and the set blank white is stored in the RAM 11, and the process proceeds to step S10.

In step S10, display pixel data of the original image designated by the BML of the data broadcast program so that the entire content of the data broadcast program is displayed on the small display 15 based on the thinning coefficient (FIG. 2 ( The thinning process is performed (a) (vertical 1080 × horizontal 1920 display pixels) in step a), and the process proceeds to step S11. In step S11, a drawing process of writing drawing data, which is an image signal generated based on the thinned display pixel data, to the VRAM is performed, and the process proceeds to step S12.

In step S12, the character size to be displayed on the small display 15 is determined.
That is, the character size specified by BML of the data broadcast program is multiplied by the calculated thinning coefficient to determine the character size to be displayed on the small display 15, and the process proceeds to step S13.

In step S13, a process of reading characters corresponding to the calculated display character size from the font ROM is performed, and the process proceeds to step S14. In step S14, it is determined whether or not there is a character corresponding to the determined display character size. If it is determined that there is a corresponding character, the process proceeds to step S16.

On the other hand, if it is determined in step S14 that there is no corresponding character, the process proceeds to step S15. In step S15, a character having a size closest to the display character size is read, and then the process proceeds to step S16.
In step S16, a process of overwriting the read data on the drawing data written in the VRAM without performing a thinning process is performed, and the process proceeds to step S17.

In step S17, the drawing data written in the VRAM is output to the adder 7, the necessary video signals are added and output to the small display 15, and as shown in FIG. 2 (b) or (c). A process of displaying the entire program content of the original image of the data broadcast program on the small display 15 is performed, and then the process proceeds to step 18.

In step S18, whether or not there is an instruction to redraw the data broadcast program, that is, an instruction to perform dynamic control to change part of the currently displayed content in response to a predetermined input from the user. Or if there is an instruction to change the contents and attribute values of each element of the BML by using a script language, and if it is determined that there is such a redrawing instruction, the process returns to step S10. Using the same decimation factor, the data broadcast program display process is repeated.
On the other hand, if it is determined in step S18 that there is no instruction to redraw the data broadcast program,
End the process.

Next, the display area switching display (1) of the data broadcast program displayed on the small display 15 will be described based on the display example shown in FIG.
According to the display processing of the data broadcast program on the small display 15 as described above, the entire program content of the original image of the data broadcast program can be displayed without distortion and without missing characters or collapse. However, since the display 15 is a small display 15, when the entire display content is displayed, the display content is inevitably displayed small, and small characters and the like are difficult to see. In view of this, the display area switching display shown in FIG.

FIG. 4 (a) shows a display on a small display 15 having a screen pixel number of 240 × 480 in width.
This shows a state in which the entire program content of the data broadcasting program is displayed. When the user touches a predetermined position via the touch panel 16 in the state of FIG. 4A, the screen is switched to the screen of FIG.

In FIG. 4B, data of the number of screen pixels (vertical 240 × horizontal 480) is converted from data of the number of display pixels (vertical 1080 × horizontal 1920) of the original image designated by BML with the touched position as the center. -It is designed to be displayed without being thinned out by cutting out the data. Then, when a predetermined time elapses in the state of FIG. 4B, the screen display shown in FIG. 4A is switched.

The predetermined time may be set in advance to a predetermined value (for example, about 5 seconds), or a setting screen for the predetermined time is provided so that the user can set a desired time according to the usage mode. You may be able to set it. Alternatively, a terminal (not shown) capable of capturing vehicle speed information from a vehicle speed sensor or the like is provided in the digital broadcast receiver, and the vehicle speed connected to the terminal when the digital broadcast receiver is attached to the vehicle. Vehicle speed information from a sensor or the like may be taken in, and a predetermined time may be automatically set according to the taken vehicle speed information, for example, when the vehicle is stopped, at low speed, and at high speed.

Next, the display area switching processing operation (1) performed by the CPU 9 in the digital broadcast receiver according to the embodiment (1) will be described based on the flowchart shown in FIG. This process is
After the processing shown in FIG. 3 is performed, the processing is performed based on an input operation via the touch panel 16 of the user.

First, in step S21, it is determined whether a position designation signal from the touch panel 16 has been detected. If it is determined that a position designation signal has been detected, the process proceeds to step S22.
In step S22, a display content specifying process for specifying the position on the designated data broadcast program is performed based on the coordinate data on the screen included in the position specifying signal, and the process proceeds to step S23.

In step S23, the vertical and horizontal directions of the small display 15 are obtained from the data of the vertical and horizontal display pixel numbers (vertical 1080 × horizontal 1920) of the original image designated by the BML with the position on the specified data broadcast program as the center. Pixel data cut out for the data of the number of screen pixels (vertical 240 x horizontal 480)
A cut-out redrawing process for writing data into the VRAM without performing a thinning process is performed, and the process proceeds to step S24.

In step S24, the drawing data written in the VRAM is output to the small display 15 via the adder 7, and the program content at the specified position is partially enlarged and displayed.
Thereafter, the process proceeds to Step 25.

In step S25, it is determined whether or not a predetermined time has elapsed. If it is determined that the predetermined time has not elapsed, the process returns to step S24. If it is determined that the predetermined time has elapsed, the process proceeds to step S26.

In step S26, the display pixel data thinned by the thinning coefficient calculated so as to display the entire program content of the data broadcast program is redrawn to display the entire program content of the data broadcast program. Process is performed, and then the process ends.

Next, the display area switching display (2) of the data broadcast program displayed on the small display 15 will be described based on the display example shown in FIG. 6 (a) and 6 (b) are shown in FIG.
) And (b) are the same as those shown in FIG.

In the display area switching display (1), when a predetermined time elapses from the partially enlarged display state at the designated position shown in FIG. 4B, the screen display is switched to the screen display in FIG. ,
In the display area switching display (2) shown in FIG. 6, it is stepwise from the state of partial enlarged display at the designated position shown in FIG. 6 (b) until the screen display shown in FIG. 6 (a) is switched. A screen with an expanded display area is displayed. The display state is shown in FIGS.

In this way, by expanding the display area step by step, in the partial enlarged display of the screen shown in FIG. 6A, when the content is excessively enlarged, the display is appropriately sized according to the content. The contents can be displayed sequentially, and the contents around the partially enlarged display portion are also displayed in an easy-to-see manner.

Next, the display area switching processing operation (2) performed by the CPU 9 in the digital broadcast receiver according to the embodiment (1) will be described based on the flowchart shown in FIG. However, this display area switching processing operation (2) has a configuration in which step S31 is inserted between step S24 and step S25 in FIG. 5, and only the difference will be described here.

In step S24, the program content at the specified position is partially enlarged and displayed, and then the process proceeds to step 31.
In step S31, the display area of the program content is expanded stepwise from the display area of the data broadcast program that is currently partially enlarged to the display area where the entire program content of the data broadcast program is displayed. As described above, the pixel data of a predetermined pixel size (screen pixel size or larger) is read from the display pixel size of the original image specified by BML, thinned by the predetermined thinning coefficient that has been set, and the thinned display pixel A redrawing process for writing the data into the VRAM, and a process for outputting the redrawing data written in the VRAM to the small display 15 via the adder 7 to display the program content in the predetermined pixel size area. Then, the process proceeds to step 25.

In step S25, it is determined whether or not a predetermined time has elapsed. If it is determined that the predetermined time has not elapsed, the process returns to step S31, and the redrawing process for expanding the display area step by step, and the predetermined pixel size area Repeat the program content display process.

On the other hand, if it is determined in step S25 that the predetermined time has elapsed, the process proceeds to step S26, and in step S26, the display pixel subjected to the thinning process with the thinning coefficient calculated so as to display the entire contents of the data broadcast program. The data is redrawn to perform the process of displaying the entire contents of the data broadcast program, and the process is terminated.

As another display example, the display area of the data broadcast program may not be expanded stepwise as described above, but may be displayed in a display area designated in advance. In this case, the thinning coefficient may be set through the setting screen so as to be a user's favorite display area (for example, 360 × 640 pixels), and the thinning coefficient set by the user may be used. The pixel data obtained by thinning out the data of the number of display pixels of the original image specified by BML is VR.
It is also possible to perform a redrawing process for writing to the AM.

Next, the display area switching display (3) of the data broadcast program displayed on the small display 15 will be described based on the display example shown in FIG.
In the display area switching display (2), during the period from the partial enlarged display state at the designated position shown in FIG. 6B to the screen display shown in FIG. As shown in e), a screen with the display area expanded step by step is displayed.
), When a touch operation is detected via the touch panel 16 in the middle of displaying a screen in which the display area is expanded step by step (any state in FIGS. 6C to 6E), When the display area size being displayed is maintained (the state shown in FIG. 8A), and a touch operation is further detected while the display area size is maintained (the state shown in FIG. 8B), the reverse The display area is narrowed step by step, and redrawing is performed to return to the original enlarged display (state of FIG. 6B). The display state is shown in FIGS. 8 (c) and 8 (d).

By holding the display area as shown in FIG. 8 (b), it becomes easier to confirm the program contents, and by narrowing the display area step by step as shown in FIGS. 8 (c) and (d), the program contents are reduced. The partial enlarged display is displayed again so that the contents such as small characters that have been overlooked can be easily reconfirmed.

Next, the display area switching processing operation (3) performed by the CPU 9 in the digital broadcast receiver according to the embodiment (1) will be described based on the flowchart shown in FIG. However, this display area switching processing operation (3) has a configuration in which steps S41 to S45 are inserted between step S31 and step S25 in FIG. 7, and only the difference will be described here. To do.

In step S31, the display area of the program content is expanded stepwise from the display area of the data broadcast program currently being partially enlarged to the display area where the entire content of the data broadcast program is displayed. Then, pixel data of a predetermined pixel size (screen pixel size or larger) is read from the display pixel size of the original image specified by BML, thinned by a predetermined thinning coefficient, and the thinned display pixel data is displayed. A redrawing process for writing the data into the VRAM, and a process for outputting the redrawing data written in the VRAM to the small display 15 via the adder 7 to display the program contents in a predetermined pixel size area, Thereafter, the process proceeds to step 41.

In step S41, it is determined whether a touch operation on the touch panel 16 is detected,
If it is determined that a touch operation has been detected, the process proceeds to step S42.
In step S42, a process of holding the display area size when the touch operation is detected is performed, and the process proceeds to step S43.
In step S43, it is determined whether or not a touch operation on the touch panel 16 is further detected. If it is determined that a touch operation is further detected, the process proceeds to step S44.

In step S44, BML is specified so that the display area of the program content is gradually reduced from the current display area size to the area size cut out by the data of the number of vertical and horizontal screen pixels of the small display 15. Pixel data of a predetermined pixel size (below the current display pixel size) is read from the display pixel size of the original image, thinned by a predetermined thinning coefficient, and the thinned display pixel data is written to the VRAM. A redrawing process and a process of outputting the redrawing data written in the VRAM to the small display 15 via the adder 7 to display the program contents in the area of a predetermined pixel size are performed, and then step 25 Proceed to

On the other hand, if it is determined in step S41 or step S43 that no touch operation has been detected, the process proceeds to step S25.
In step S25, it is determined whether or not a predetermined time has elapsed. If it is determined that the predetermined time has not elapsed, the process proceeds to step S45.

In step S45, the number of touch operation detections is determined. If it is determined to be 0, the process returns to step S41. If it is determined to be 1 time, the process returns to step S43.
Returning to 44, each process is repeated until a predetermined time elapses.

As another display example, the display pixel data thinned with a predetermined thinning coefficient is redrawn from the state shown in FIG. 8D to further narrow the display area of the program display content. In this way, by further enlarging the display, for example, small characters and small patterns that are difficult to see even in partial enlargement display by cutting out only the number of screen pixels from the display pixel size of the original image. Etc. can be displayed in an easy-to-read manner.

According to the digital broadcast receiver according to the above embodiment (1), the entire program content of the data broadcast program can be displayed without distortion even if the display 15 is small and has a low resolution. Therefore, the viewer can view the entire program contents without feeling uncomfortable even on a small and low-resolution screen.
In addition, even when the aspect ratio of the display pixel number of the original image specified by BML is different from the aspect ratio of the screen pixel number of the small display 15, the aspect ratio of the display pixel number of the original image specified by BML is different. -The entire contents of the broadcast program can be displayed.
In addition, a blank area in which the content of the data broadcast program is not displayed can be set as a single-color filled image, and the viewer can easily understand that the blank area is the blank area.

In addition, when redrawing for rewriting part of the program contents is instructed, it can be redrawn without changing the spatial layout of characters and graphics of the original image specified in BML. It is possible to display without losing the linkage of the contents.

In addition, when the calculated decimation coefficient is not 1 / integer, the decimation coefficient is 1 / integer.
Because it is corrected to, it is easy to thin out, the entire program content can be displayed without distortion,
Screen pixels can be used effectively.

Further, the size of the character displayed on the small display 15 is determined based on the character size of the original image specified by BML and the thinning coefficient, and the character corresponding to the determined character size is read from the font ROM and read out. Since the characters are drawn without being thinned out, even the small display 15 can eliminate the partial omission and crushing of the characters due to the thinning out processing, and can clearly display the characters.

In addition, the display control program for realizing the above functions according to the size of the small display 15 is downloaded by broadcasting or the like, and the display control program is replaced, so that these functions can be easily used in other digital broadcast receivers. It can also be realized.

Further, in the display area switching display (1), from the state where the entire program content is displayed on the small display 15, the program content at the position specified via the touch panel 16 can be partially enlarged and displayed. Therefore, even if it is difficult to view the contents of the program, it is possible to easily enlarge and display the portion simply by designating the position to be viewed. By displaying it, it is possible to make the contents easy to see.

Further, in the display area switching display (2), the display area of the program contents is gradually expanded from the partially enlarged display state cut out by the number of vertical and horizontal screen pixels of the small display 15 to the state where the entire program contents are displayed. For example, in the partially enlarged display state, if the content is enlarged too much, it can be displayed in an appropriate size that is easy to read according to the content, and the periphery of the partially enlarged display portion The contents of can also be made easier to see.

In the display area switching display (3), the user can read the display contents with the retained display area size without worrying about switching of the displayed area size, and the program contents can be confirmed sufficiently. If it is not possible, the operation of repeatedly displaying is unnecessary.
Further, since the display area size is gradually reduced from the state in which the display area size is maintained to the area size to be cut out and displayed by the number of vertical and horizontal screen pixels of the small display 15, the program content is gradually reduced. For example, when you want to overlook without confirming the contents well and want to see the contents in an enlarged state again, you can enlarge the contents of the program and display it again. The contents can be enlarged and confirmed immediately,
This is convenient for the user.

FIG. 10 is a block diagram schematically showing a main part of the digital broadcast receiver according to the embodiment (2). However, component parts having the same functions as those of the digital broadcast receiver shown in FIG. 1 are denoted by the same reference numerals, description thereof is omitted, and CPUs 9a having different functions are denoted by different reference numerals.

The digital broadcast receiver according to the embodiment (2) is different from the digital broadcast receiver according to the embodiment (1) in that a speech synthesizing means 17 is provided.
In the CPU 9a, a character string touched by the user via the touch panel 16 is recognized. The voice synthesizer 17 synthesizes voice data based on the character data of the recognized character string, converts the voice data into voice, and outputs the voice. The digital signal processor, digital / analog converter It is configured to include a vessel.

Since the display processing operation of the data broadcast program performed by the CPU 9a in the digital broadcast receiver according to the embodiment (2) is substantially the same as the display processing operation shown in FIG. 3, the description thereof is omitted here.

The display area switching processing operation performed by the CPU 9a in the digital broadcast receiver according to the embodiment (2) will be described based on the flowchart shown in FIG. The present display area switching processing operation is further performed between step S41 and step S42 in FIG.
-S56 is inserted, and only the differences will be described below.

If it is determined in step S41 that a touch operation on the touch panel 16 has been detected, the process proceeds to step S51.
In step S51, it is determined whether or not the displayed character string is designated from the coordinate data in which the touch operation is detected. If it is determined that the display character string is not designated, step S51 is performed.
Go to 42. On the other hand, if it is determined in step S51 that the display character string is designated, the process proceeds to step S52.

In step S52, the character data of the designated display character string is recognized, and the speech synthesizer 17
Then, a process of synthesizing speech data from the recognized character data is performed, and the process proceeds to step S53.
In step S53, a voice output process (speech process for a designated character string) is performed for converting the synthesized voice data into a voice and outputting it from the speaker 14, and the process proceeds to step S54.

In step S54, it is determined whether a touch operation on the touch panel 16 is detected during voice output (during reading of a designated character string). If it is determined that a touch operation has been detected, the process proceeds to step S55. In step S55, a voice output stop process for stopping the reading process of the designated character string is performed, and the process proceeds to step S26.

On the other hand, if it is determined in step S54 that no touch operation has been detected during audio output, the process proceeds to step S56. In step S56, it is determined whether or not the voice output process for reading the designated character string has been completed. If it is determined that the process has not ended, the process returns to step S54. If it is determined that the process has ended, the process returns to step S26. move on.

According to the digital broadcast receiver according to the above embodiment (2), since the display character string designated via the touch panel 16 is synthesized by voice and output, the user can display the displayed program contents. There is no need to gaze at the screen to read, and the content of the character string specified by the read-out voice can be grasped, especially when it is adopted for in-vehicle use, which can improve safety during driving. it can.

Also, you can stop reading the specified text string by simple operation. For example, when you start reading aloud by voice,
If the contents are unnecessary, the reading can be stopped immediately, and the user can efficiently listen only to the contents that the user wants to hear.

It is the block diagram which showed roughly the principal part of the digital broadcast receiver which concerns on embodiment (1) of this invention. (A) is explanatory drawing for demonstrating an example of the display pixel data of the data broadcast program prescribed | regulated in the received BML, (b) is display pixel data shown to (a). A display example when a data broadcast program having data is displayed on a small display having 240 × vertical × 480 pixels, (c) is data having display pixel data shown in (a). A display example is shown when a broadcast program is displayed on a small display having a length of 270 × width of 480 pixels. 5 is a flowchart showing a data broadcast program display processing operation performed by a CPU in the digital broadcast receiver according to the embodiment (1). (A), (b) is the figure which showed the example of a display for demonstrating the display area switching display (1) of the data broadcast program displayed on the small display. It is a flowchart which shows the display area switching processing operation (1) which CPU performs in the digital broadcast receiver which concerns on embodiment (1). (A)-(e) is the figure which showed the example of a display for demonstrating the display area switching display (2) of the data broadcast program displayed on the small display. It is a flowchart which shows the display area switching process operation (2) which CPU performs in the digital broadcast receiver which concerns on embodiment (1). (A), (b) is the figure which showed the example of a display for demonstrating the display area switching display (3) of the data broadcast program displayed on the small display. It is a flowchart which shows the display area switching process operation (3) which CPU performs in the digital broadcast receiver which concerns on embodiment (1). It is the block diagram which showed roughly the principal part of the digital broadcast receiver which concerns on embodiment (2). 6 is a flowchart showing a display area switching processing operation performed by a CPU in the digital broadcast receiver according to the embodiment (2).

Explanation of symbols

1 Tuner 2 Demodulator 3 TS Decode Unit 4 Audio Decode Unit 5 Video Decode Unit 6 BML Decode Unit 7 Adder 8 Drawing Processing Units 9 and 9a CPU
10 ROM
11 RAM
12 Modem 13 I / O
14 Speaker 15 Small display 16 Touch panel 17 Speech synthesis means

Claims (14)

Receiving means for receiving a broadcast wave; demodulating means for demodulating the broadcast wave received by the receiving means; and image signal output means for outputting an image signal to the display means based on the demodulated signal demodulated by the demodulating means. A digital broadcast receiver,
Thinning coefficient calculation means for calculating a thinning coefficient of display pixel data for associating the number of vertical and horizontal display pixels of the original image based on the demodulated signal with the number of vertical and horizontal screen pixels of the display means;
Based on the thinning coefficient calculated by the thinning coefficient calculating means, thinning processing means for performing thinning processing of display pixel data so that the entire display content of the original image is displayed on the display means;
Image signal generating means for generating an image signal based on display pixel data thinned by the thinning processing means;
Character data storage means for storing data on the typeface and size of the character;
Display character size determining means for determining a character size to be displayed on the display means based on the character size specified in the original image and the thinning coefficient;
The character corresponding to the character size determined by the display character size determining means is changed to the character data.
And a first character drawing means for drawing the read character without performing the thinning process after the thinning process of the display pixel data by the thinning processing means is completed. Digital broadcast receiver. When a character having a size corresponding to the character size determined by the display character size determining means is not stored in the character data storage means, the characters stored in the character data storage means are selected from the characters stored in the character data storage means. 2. The digital broadcast receiver according to claim 1, further comprising character size selection means for selecting a character having a size close to the character size. Receiving means for receiving a broadcast wave; demodulating means for demodulating the broadcast wave received by the receiving means; and image signal output means for outputting an image signal to the display means based on the demodulated signal demodulated by the demodulating means. A digital broadcast receiver,
Thinning coefficient calculation means for calculating a thinning coefficient of display pixel data for associating the number of vertical and horizontal display pixels of the original image based on the demodulated signal with the number of vertical and horizontal screen pixels of the display means;
Based on the thinning coefficient calculated by the thinning coefficient calculating means, thinning processing means for performing thinning processing of display pixel data so that the entire display content of the original image is displayed on the display means;
Image signal generating means for generating an image signal based on display pixel data thinned by the thinning processing means;
Character type data storing means for storing character type data;
Display character size determining means for determining a character size to be displayed on the display means based on the character size specified in the original image and the thinning coefficient;
Character type data to be displayed is read out from the character type data storage means, and the type data is read out.
Character creation means for creating a character having a character size determined by the display character size determination means by performing a vector operation based on the data;
And a second character rendering unit that renders the character created by the character creating unit without performing the thinning process after the display pixel data thinning process by the thinning processing unit is completed. Digital broadcast receiver. Input means capable of designating an arbitrary position on the display means screen is connected,
The position designated by the position designation signal when the position designation signal from the input means is detected after the image signal generation means has produced the image signal based on the thinned display pixel data. Display content specifying means for specifying the content displayed in
First, the display contents specified by the display contents specifying means are approximately centered on the position of the display contents, and the original picture is cut out from the number of display pixels in the vertical and horizontal directions by the number of screen pixels in the vertical and horizontal directions and redrawn without thinning out. The digital broadcast receiver according to any one of claims 1 to 3, further comprising: a redrawing unit. The first redrawing means further expands the display area of the display content stepwise from the area cut out by the number of screen pixels in the vertical and horizontal directions of the display means to the area where the entire display content is displayed. 5. The digital broadcast receiver according to claim 4, wherein the display pixel data thinned with a predetermined thinning coefficient is redrawn. A decimation factor setting means for allowing a user to set a decimation factor for the display pixel data;
The first redrawing means redraws the display pixel data in which the number of vertical and horizontal display pixels of the original image has been thinned with the thinning coefficient set by the thinning coefficient setting means. 5. The digital broadcast receiver according to claim 4, wherein The thinning coefficient calculated so that the first redrawing unit displays the entire display content after a predetermined time has elapsed from the time when the first redrawing unit redraws without performing thinning processing by the number of vertical and horizontal screen pixels of the display unit. 7. The digital broadcast receiver according to claim 4, wherein the display pixel data subjected to the thinning process is redrawn. 8. The digital broadcast receiver according to claim 7, further comprising first redrawing time setting means that allows the user to set the predetermined time to an arbitrary time. Vehicle speed information capturing means capable of capturing vehicle speed information;
8. The digital broadcast receiver according to claim 7, further comprising second redrawing time setting means for setting the predetermined time based on the vehicle speed information fetched by the vehicle speed information fetching means. A display area size holding means for holding a display area size of display contents when the input operation signal is detected when a predetermined input operation signal is detected from the input means. Item 10. The digital broadcast receiver according to any one of Items 5 to 9. When the display area size when the input operation signal is detected is held, and when a predetermined input operation signal is detected from the input means, the vertical and horizontal screen pixels of the display means are calculated from the display area size. Second redrawing means for redrawing the display pixel data thinned by a predetermined thinning coefficient so as to narrow the display area of the display contents in stages until the area size cut out by several minutes is provided. The digital broadcast receiver according to claim 10, wherein the digital broadcast receiver is provided. When the display area size when the input operation signal is detected is held, and when a predetermined input operation signal is detected from the input means, the vertical and horizontal screen pixels of the display means are calculated from the display area size. And a third redrawing means for redrawing the display pixel data thinned by a predetermined thinning coefficient so as to narrow the display area of the display content to be larger than the size of the area cut out by several minutes. The digital broadcast receiver according to claim 10. A character string designation determining means for determining whether or not a character string on which the input operation signal is displayed when a predetermined input operation signal is detected from the input means;
Speech synthesis means for synthesizing speech from data of the designated character string when the character string designation judging means judges that the character string on which the input operation signal is displayed is designated;
11. The digital broadcast receiver according to claim 10, further comprising voice output processing means for performing output processing of the voice synthesized by the voice synthesis means. And a voice output stop unit that stops the output of the voice when a predetermined input operation signal is detected from the input unit during the output of the voice output by the voice output processing unit. The digital broadcast receiver according to claim 13.

Images