JPH10257525A - Digital broadcast receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a digital broadcast receiver that receives broadcast signal of a plurality of broadcast systems including a stereoscopic broadcast system. SOLUTION: A frame memory 3 stores pixel data outputted from a decode circuit 2. A discrimination circuit 4 receives the pixel data outputted from the decode circuit 2 and compares the pixel data in a specific area AR1 in a frame with the pixel data in a specific area AR2 respectively and discriminates whether or not received video data correspond to a stereoscopic broadcast system based on the result of comparison. An output signal format circuit 5 uses the pixel data stored in the frame memory 3 based on the result of discrimination to generate an output signal for displaying a video image on a monitor connected to a post stage.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital broadcast receiver, and more particularly to a digital broadcast receiver capable of receiving a plurality of broadcast systems including a stereoscopic broadcast system.

[0002]

2. Description of the Related Art Conventionally, as an example of a digital broadcasting system, there is a 525p progressive scanning digital broadcasting system (hereinafter referred to as a non-interlaced digital broadcasting system).

[0003] Such a non-interlaced digital broadcasting system is described in, for example, February 27, 1996.
Details are shown in "Development of CS Digital Broadcasting System Compatible with 525 Progressive Scanning Signals" by Urano et al. On pages 25 to 30 of the Television Society Technical Report Vol. Detailed description is omitted. The non-interlaced digital broadcasting system provides a broadcasting service using video data compatible with the non-interlaced scanning method, which is different from the current interlaced scanning method (NTSC).

Further, a digital stereoscopic broadcasting system for providing a stereoscopic broadcasting service using the non-interlaced digital broadcasting system has been proposed by the applicant of the present application (Japanese Patent Application No. 08-326721), but it has not been known yet. The proposed digital three-dimensional broadcasting system converts video signals for the right and left eyes that are compatible with the interlaced scanning method into video data that is compatible with the non-interlaced scanning method. Is transmitted, and this is to be displayed three-dimensionally.

[0005]

However, the conventional digital three-dimensional broadcasting system proposed as described above cannot receive video data transmitted and received by the conventional non-interlaced digital broadcasting system.
On the other hand, the conventional non-interlaced digital broadcasting system cannot receive video data transmitted and received by the proposed digital stereoscopic broadcasting system (hereinafter, referred to as video data compatible with the stereoscopic broadcasting system).

Therefore, for example, in providing a normal broadcasting service and a three-dimensional broadcasting service, the user (reception side) needs to have a tuner for a non-interlace digital broadcasting system and a tuner for a digital three-dimensional broadcasting system. There is a problem that the equipment and circuit configuration are significantly large.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an object of the present invention is to provide a digital broadcast receiver capable of receiving a plurality of broadcast systems including a three-dimensional broadcast system. It is in.

Another object of the present invention is to provide a digital broadcast receiver capable of receiving a three-dimensional broadcast service and a normal broadcast service with simple equipment and circuit configuration.

[0009]

A digital broadcast receiver according to claim 1 demodulates and expands received video data.
A receiving unit that outputs pixel data, and a determining unit that determines whether the video data is video data compatible with the stereoscopic broadcast system based on the pixel data output by the receiving unit.

A digital broadcast receiver according to claim 2 is
2. The digital broadcast receiver according to claim 1, wherein the video data is first video data corresponding to a stereoscopic broadcasting system or second video data corresponding to a broadcasting system different from the first video data. The determination means determines whether the received video data is the first video data or the second video data.

A digital broadcast receiver according to claim 3 is
3. The digital broadcast receiver according to claim 2, wherein the video data includes pixel data arranged in a matrix in a horizontal direction and a vertical direction, and the first video data includes pixel data for a right eye. And the second block including pixel data for the left eye constitutes an array.

A digital broadcast receiver according to claim 4 is
4. The digital broadcast receiver according to claim 3, wherein the discriminating means includes pixel data of a specific area of the first block and pixel data of a specific area of a second block corresponding to the specific area of the first block. Comparing the pixel data of the specific area of the first block stored in the storage means with the pixel data of the specific area of the second block stored in the storage means. Processing means for determining whether the received video data is the first video data or the second video data and outputting the same.

A digital broadcast receiver according to claim 5 is
2. The digital broadcast receiver according to claim 1, wherein the video data is reproduced and displayed by a non-interlace scanning method.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION

[Embodiment 1] Embodiment 1 of the present invention enables a digital broadcast receiver to receive and play back a plurality of broadcast systems including a stereoscopic broadcast system.

The digital broadcast receiver according to the first embodiment of the present invention includes a video data (hereinafter, referred to as a broadcast system 1) provided by a non-interlaced digital broadcast system or a digital stereo broadcast system (Japanese Patent Application No. 08-32672).
The video data corresponding to the stereoscopic broadcast system provided by 1) is received.

FIG. 1 is a diagram showing a screen configuration of video data received by the digital broadcast receiver according to the first embodiment of the present invention, and FIG. FIG. 1B shows a screen of video data compatible with the stereoscopic broadcasting system.

Referring to FIG. 1, the screen (FIG. 1B) of the video data corresponding to the stereoscopic broadcasting system has a horizontal pixel number of 704 pixels.
The number of pixels (I = 1 to 704) × the number of pixels in the vertical direction is 480 pixels (J = 1 to 480), and the screen of the video data corresponding to the broadcast system 1 (FIG. 1A), It matches the screen of the scanning method. Further, the screen of the video data corresponding to the three-dimensional broadcasting system (FIG.
One of the blocks B1 and B2 corresponds to the screen of the right-eye video signal acquired by the interlaced scanning method, and the other corresponds to the screen of the left-eye video signal acquired by the interlaced scanning method (hereinafter, referred to as a screen). For simplicity, block B1 corresponds to the right eye and block B2 corresponds to the left eye).

For reference, the configuration and operation of the transmitting side of the digital three-dimensional broadcasting system 200 proposed by the applicant of the present application and the generation of video data (FIG. 1B) corresponding to the three-dimensional broadcasting system will be described.

FIG. 2 shows a digital three-dimensional broadcasting system 20.
FIG. 2 is a block diagram schematically showing a basic configuration of a transmission side of 0. With reference to FIG.
The transmission side of 0 includes cameras 23a and 23b compatible with the interlaced scanning method for inputting video and a frame memory device 20 on the transmission side.

The transmission-side frame memory device 20 converts two-field video signals received from each of the cameras 23a and 23b into one-frame video data (see FIG. 1B) compatible with the stereoscopic broadcast system. .

More specifically, the transmission side frame memory device 2
0 includes two field memories (not shown), and writes the right-eye video signal R received from the camera 23a to one field memory, and writes the left-eye video signal L received from the camera 23b to the other field memory. Then, by reading the right-eye video signal R and the left-eye video signal L from each field memory at twice the writing speed, video data compatible with the stereoscopic broadcast system is generated.

FIG. 3 shows a digital three-dimensional broadcasting system 20.
3A and 3B are schematic diagrams for explaining the operation of the transmission side frame memory device 20 of FIGS. 3A and 3B, and FIGS. 3A and 3B show examples of the screen configuration of the right-eye video signal R and the left-eye video signal L, respectively. FIG. 3C shows a screen configuration of video data output from the transmission-side frame memory device 20.

Referring to FIGS. 3A and 3B, the number of effective pixels on the screen corresponding to the right-eye video signal R and the left-eye video signal L is calculated as 704 horizontal pixels (horizontal pixel number I). : I = 1 to 704) × 240 pixels in the vertical direction (vertical direction pixel number J: J = 1 to 240), and the horizontal synchronization frequency FH of the video signal R for the right eye and the video signal L for the left eye is 15.75 kHz. , The vertical synchronization frequency FR is 5
9.94 Hz.

In this case, if the write frequency to the field memory is FH and the read frequency is (2 × FH),
The horizontal frame frequency having the screen configuration described with reference to FIG.
Video data having a frequency of 59 kHz and a vertical synchronization frequency of 59.94 Hz is generated.

Referring to FIG. 2, the transmitting side of digital stereoscopic broadcast system 200 further includes a video encoder 22,
Sound collecting device 24, audio encoder 25, multiplexing device 21,
A digital modulator 26 and a satellite communication device 27 are provided. The video data generated by the transmission side frame memory device 20 complies with the MPEG2 standard (Motion Picture).
e Coding Expert Group pha
se2: International standard for full-color video compression
After being compressed in accordance with the above, the data is modulated and transmitted via the communication satellite 28.

Next, the digital three-dimensional broadcasting system 200
The configuration and operation of the digital broadcast receiver 100 according to Embodiment 1 of the present invention, which corresponds to the receiving side, will be described.

FIG. 4 is a block diagram schematically showing a basic configuration of digital broadcast receiver 100 according to Embodiment 1 of the present invention. Referring to FIG. 4, digital broadcast receiver 100 includes receiving circuit 1, decoding circuit 2, frame memory 3, discriminating circuit 4, output signal format circuit 5, and CPU 6.

The digital broadcast receiver 100 transmits one channel of video data (FIGS. 1A and 1B) to the antenna 1
2 to receive. The receiving circuit 1 includes a tuner (not shown) and a digital demodulation circuit, and digitally demodulates the received video data.

The decoding circuit 2 receives the output of the receiving circuit 1, decompresses (eg, decodes according to MPEG2), and outputs pixel data.

The frame memory 3 stores the pixel data output from the decoding circuit 2 for each frame.

The discriminating circuit 4 receives the pixel data output from the decoding circuit 2 and receives the video data corresponding to the stereoscopic broadcasting system (FIG. 1B) or to the broadcasting system 1 (FIG. 1). (A)) It is determined whether or not to perform.

The output signal format circuit 5 formats the pixel data stored in the frame memory 3 based on the determination result of the determination circuit 4 to generate an output signal. The output signal is sent to a monitor located at a subsequent stage (not shown).

The CPU 6 controls each constituent circuit. FIG.
FIG. 5 is a diagram for explaining an example of a target of a determination process in the determination circuit 4 according to the first embodiment of the present invention. Referring to FIG. 5, determination circuit 4 uses pixel data of specific area AR1 and specific area AR2 in one frame of video data for determination.

The specific areas AR1 and AR2 are determined corresponding to the blocks B1 and B2 (see FIG. 1B), respectively. As an example, when the blocks B1 and B2 have the relationship shown in FIG.
Is defined as P pixels (P = X2−X1 + 1) × Q pixels (P = X2−X1 + 1) in the horizontal direction, where the horizontal pixels are X1 to X2 (= I) and the vertical pixels are Y1 to Y2 (= J). Q = Y2-Y1 + 1) and the specific area AR2
Is defined as P pixels in the horizontal direction (P = X2-X1 + 1) × Q pixels in the vertical direction (X = X1-X2 (= I) and Y1 + 240-Y2 + 240 (= J) in the vertical direction) Q = Y2-Y1 + 1).

That is, when the block B1 is overlapped with the block B2, the area of the block B2 overlapping the specific area AR1 is defined as the specific area AR2.

FIG. 6 is a diagram showing an example of the relationship between the specific area AR1 and the specific area AR2 determined by the determination circuit 4. FIG. FIG. 6B shows a case where the video data to be determined corresponds to the stereoscopic broadcast system.

Referring to FIG. 6, video data is broadcast system 1
(FIG. 6A), the pixel data of the specific area AR1 and the pixel data of the specific area AR2 generally have a low correlation. On the other hand, when the stereoscopic broadcasting method is supported (FIG. 6B), the specific area AR1 is composed of pixel data based on the right-eye video signal, as described above.
The specific area AR2 includes pixel data based on the left-eye video signal. Therefore, in this case, the pixel data of the specific area AR1 and the pixel data of the specific area AR2 do not match due to the binocular parallax, but have a high correlation.

Therefore, the pixel data of the specific area AR1
By examining the relationship with the pixel data of the specific area AR2, it is determined whether or not the data is video data compatible with the stereoscopic broadcast system.

FIG. 7 is a block diagram schematically showing a basic configuration of an example of the determination circuit 4 according to the first embodiment of the present invention. Referring to FIG. 7, determination circuit 4 includes CPU 10,
The memory 11 is included.

The CPU 10 receives an address value ad from the decode circuit 2 via the address line L1 and pixel data via the data line L2. Then, the pixel data of the specific areas AR1 and AR2 is sent to the memory 11. The memory 11 receives the pixel data from the CPU 10 and stores it. Further, the CPU 10 determines the video data using the pixel data stored in the memory 11, and outputs a control signal CON as a determination result. As an example of the determination method, there is a method of measuring a color difference (difference) between pixel data forming the specific area AR1 and pixel data forming the specific area AR2.

FIG. 8 is a flowchart showing a processing procedure in the determination circuit 4 according to the first embodiment of the present invention. Hereinafter, with reference to FIG. 8, an operation in the case where the CPU 10 determines based on the difference will be described.

At step s1, the CPU 10 receives the address value ad. In step s2, it is checked whether or not the obtained address value ad indicates the specific area AR1 or the specific area AR2 to be compared. If the address value ad does not correspond to the specific areas AR1 and AR2,
Returning to step s1, the next transmitted address value ad is obtained.

On the other hand, if the address value ad corresponds to the specific areas AR1 and AR2, the process proceeds to step s3.
The pixel data corresponding to the address value ad is stored in the memory 11.

In step s4, specific areas AR1, AR
It is checked whether or not all the pixel data that constitutes No. 2 have been stored in the memory 11.

If not, the process returns to step s1. If all the pixel data constituting the specific areas AR1 and AR2 are stored in the memory 11, step s5
, The pixel data of the specific area AR1 and the specific area A
Compare with R2 pixel data (take difference).

At step s6, upon receiving the comparison result (difference result) at step s5, it is compared with a predetermined reference value.

If the comparison result is equal to or larger than the reference value, the received video data is video data compatible with the stereoscopic broadcasting system (step s7). Step s8) is determined, and the result of this determination is set in the control signal CON and output.

The output signal format circuit 5 formats the pixel data stored in the frame memory 3 based on the control signal CON to generate an output signal.

That is, the digital broadcast receiver 100 according to Embodiment 1 of the present invention can determine the broadcast system (including the stereoscopic broadcast system) of the received video data, and perform appropriate formatting based on the determination result. By doing so, the received video data can be reproduced and displayed.

In this embodiment, the case where the difference is used as the discriminating method has been described, but other methods may be used.

[0051]

As described above, according to the digital broadcast receiver of the present invention, by analyzing the received video data, it is possible to convert the received video data into video data compatible with a stereoscopic broadcast system or video data compatible with a normal broadcast system. Can be determined.

Further, according to the digital broadcast receiver of the present invention, the received video data can be appropriately displayed on a monitor connected to the subsequent stage by using the result of the determination of the broadcast system.

Further, according to the digital broadcast receiver of the present invention, whether any video data is received is determined by determining whether or not the video data is compatible with the stereoscopic broadcast system.
Since the information can be appropriately displayed on the monitor located at the subsequent stage, the reception of the stereoscopic broadcast service and the ordinary broadcast service can be realized with simple equipment and a simple circuit configuration.

[Brief description of the drawings]

FIG. 1 is a diagram showing a screen configuration of video data received by a digital broadcast receiver according to a first embodiment of the present invention.

FIG. 2 is a block diagram schematically illustrating an example of a basic configuration on a transmitting side of the digital stereoscopic broadcast system 200.

FIG. 3 is a diagram for explaining an operation of a transmission-side frame memory device 20 of the digital three-dimensional broadcasting system 200.

FIG. 4 is a block diagram schematically showing a basic configuration of digital broadcast receiver 100 according to Embodiment 1 of the present invention.

FIG. 5 is a diagram for explaining a target of a determination process in a determination circuit 4 according to the first embodiment of the present invention.

FIG. 6 is a diagram illustrating an example of a relationship between a specific area AR1 and a specific area AR2 that are determined by the determination circuit 4 according to the first embodiment of the present invention.

FIG. 7 is a block diagram showing an example of a basic configuration of a discrimination circuit 4 according to the first embodiment of the present invention.

FIG. 8 is a flowchart illustrating a procedure of a determination process in the determination circuit 4 according to the first embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Receiving circuit 2 Decoding circuit 3 Frame memory 4 Discrimination circuit 5 Output signal format circuit 6, 10 CPU 11 Memory 12 Antenna 100 Digital broadcasting receiver 200 Digital stereo broadcasting system

Claims (5)

[Claims] 1. A receiving means for demodulating and decompressing received video data and outputting pixel data, and based on the pixel data output by the receiving means, the video data is the video data compatible with a stereoscopic broadcast system. A digital broadcast receiver, comprising: a determination unit configured to determine whether or not the digital broadcast is received. 2. The video data is the first video data corresponding to a three-dimensional broadcasting system or the second video data corresponding to a broadcasting system different from the first video data. The digital broadcast receiver according to claim 1, wherein the digital broadcast receiver determines whether the received video data is the first video data or the second video data. 3. The video data includes the pixel data arranged in a matrix in a horizontal direction and a vertical direction; the first video data includes a first block including the pixel data for a right eye; The digital broadcast receiver according to claim 2, wherein the array is constituted by a second block including the pixel data for the left eye. 4. The method according to claim 1, wherein the determining unit determines the pixel data of the specific area of the first block and the pixel data of the specific area of the second block corresponding to the specific area of the first block. Storage means for receiving and storing from the receiving means; the pixel data of the specific area of the first block stored in the storage means; and the specific area of the second block stored in the storage means Processing means for comparing the received image data with the pixel data to determine whether the received image data is the first image data or the second image data, and outputting the image data. 3. The digital broadcast receiver according to 3. 5. The digital broadcast receiver according to claim 1, wherein said video data is reproduced and displayed by a non-interlaced scanning method.