JP2017112561A - Equipment and method for digital signal transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide equipment and a method for digital signal transmission, displaying information such as a reduced video on general video display equipment with appropriate mapping, even in transmission using image compression (video coding), to enable the confirmation of a transmitted video content.SOLUTION: The digital signal transmission method includes: performing the encoding processing of input non-compressed video data, to output a compressed bit stream; generating, based on the input non-compressed video data, the identification data of the non-compressed video data to respectively map the compressed bit stream and the identification data into each effective video region in a video interface; enabling viewing the mapped identification data on a monitor screen, and extracting the mapped compressed bit stream; and performing the decoding processing of the compressed bit stream to output as video data.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a video / audio digital signal transmission device and its transmission method, and more particularly, in the case of transmitting a compressed digital signal, a special measuring instrument and an analysis device are not required, and in a general video display device The present invention relates to a digital signal transmission device and a transmission method technique thereof that make it easy to visually recognize the contents of the digital signal image being transmitted.

  Conventionally, a bit stream (AV stream) generated by compressing a video / audio digital signal (AV signal) with an encoder, such as SDTI (Serial Data Transport Interface), is uncompressed video such as SDI (Serial Digital Interface). A method of mapping and transmitting to the interface data structure is used.

  By using such a technique, HDTV video (1920 × 1080, 1080i60 Hz, etc.) with a large capacity of 1.5 Gbps or 3 Gbps can be transmitted using a 270 Mbps SDI signal and a cable at the time of non-compression.

  Here, for example, Patent Document 1 discloses an HDTV signal and a reduced SDTV signal obtained by reducing an SDTV digital television signal using a transmission line capable of transmitting an HDTV digital television signal without compression. As for a system for multiplex transmission, a technique of mapping a compressed video signal of an HDTV signal to a video signal storage area in an HDTV transmission format is disclosed.

  In addition, ultra-high-definition 4K (3840 x 2160) video and 8K (7680 x 4320) video can be transmitted using 1.5 Gbps HD-SDI or 3 Gbps 3G-SDI signals and cables. Become. For example, Patent Document 2 discloses a basic technology in which data obtained by compressing an ultra-high definition video signal is transmitted using a 3G-SDI or HD-SDI serial digital interface.

  In this way, reducing the amount of data by compression eliminates the need for ultra-high-speed transmission, which makes signal quality compensation difficult, and allows the use of widely used video interfaces and cables. There is an advantage in that it can be used as it is to support new methods and services.

JP 2004-312489 A JP 2013-236211 A

  However, a video interface such as SDI can be connected to a video display device such as a monitor. However, when a compressed bit stream is assigned to data in the video area as described above, a compressed decoding process is performed. Otherwise, meaningless video such as noise will be displayed on the monitor, and the original video you want to watch will not be reproduced, that is, the content of the transmitted video will not be visible End up.

  Furthermore, because it is a compressed bit stream, it is difficult to determine whether the video is not displayed normally or whether the video is not displayed normally due to other causes such as a failure. A corresponding measuring instrument and analysis device are required, and the device configuration and method become very complicated.

  In the above Patent Document 1, the compression of the video signal of the HDTV signal is performed by reducing (thinning out) 1920 pixels in the horizontal direction of HDTV to 1/2 960 pixels or 3/4 1440 pixels. Although the image size is small, it can be displayed as it is. However, MPEG-2 and AVC / H. When image compression (video encoding) such as H.264 is used, the original video cannot be displayed as it is without decoding processing.

  Further, the compression of the video signal as in Patent Document 1 is “image compression by thinning”, and the pixel data after the processing is fixed length of 8 bits or 10 bits per pixel similarly to the pixel data before the processing. Therefore, mapping is relatively easy, but MPEG-2, H.264, etc. When image compression (video coding) such as H.264 is used, the data is not fixed length but variable length, and usually compressed in 8 × 8 pixels instead of one pixel unit. Therefore, the mapping is desired to be developed by an engineer who has at least a technique related to image compression and is familiar with the mapping.

  The present invention is for solving the above-described problems. Even in transmission using image compression (video coding) such as H.264, information such as reduced video is displayed and transmitted on a general video display device by appropriate mapping, without requiring a special device. It is an object of the present invention to provide a digital signal transmission device and a digital signal transmission method capable of easily confirming the content of a video to be transmitted.

In order to cope with the above-described problems, the present invention takes the following technical means.
That is, the invention described in claim 1 encodes input non-compressed video data and outputs a compressed bit stream, and identifies the non-compressed video data based on the input non-compressed video data. Mapping the identification data generation unit for generating the identification data, the compressed bit stream output from the encoding unit, and the identification data generated by the identification data generation unit to the effective video area in the video interface, respectively. A mapping unit, a monitor that makes the identification data mapped by the mapping unit visible on a screen, a data separation unit that extracts a compressed bitstream mapped by the mapping unit, and a data separation unit Decompress the compressed bitstream A decoding unit for outputting as over data, a transmission apparatus for digital signals, characterized in that it comprises a.

  Next, a second aspect of the present invention is the digital signal transmission apparatus according to the first aspect, wherein the identification data generation unit is configured to generate the uncompressed video data based on the input uncompressed video data. It is characterized by generating reduced video data. The invention according to claim 3 is the digital signal transmission device according to claim 1, wherein the identification data generation unit is configured to generate the uncompressed video data based on the input uncompressed video data. Characteristic information data including identification information is generated.

  According to a fourth aspect of the present invention, there is provided the digital signal transmission device according to any one of the first to third aspects, wherein the mapping unit converts the compressed bit stream and the reduced video data into video interface data. The effective image area in the structure is characterized by being mapped to a predetermined area.

  The invention according to claim 5 is the digital signal transmission apparatus according to any one of claims 1 to 3, wherein the mapping unit converts the compressed bit stream and the reduced video data into a frame of a video interface. Among the effective video areas in the structure, it is a predetermined area, and is mapped to a predetermined bit of each pixel in the area.

  Furthermore, the invention described in claim 6 encodes input non-compressed video data and outputs a compressed bit stream, and identifies the non-compressed video data based on the input non-compressed video data. Mapping the identification data generated by the identification data generation step for generating the identification data, the compressed bit stream output by the encoding step, and the identification data generated by the identification data generation step to the effective video area in the video interface, respectively. A mapping step, a data display step for recognizing the identification data mapped in the mapping step on a monitor screen, a data separation step for extracting the compressed bit stream mapped by the mapping unit, and the data The compressed bit stream extracted by the separation step and decoding, a method of transmitting a digital signal, characterized in that it comprises a decoding step of outputting as image data.

  The invention according to claim 7 is the digital signal transmission method according to claim 6, wherein the identification data generation step is based on the input uncompressed video data. The reduced video data is generated, and the reduced video data is used as identification data for the uncompressed video data.

  The invention described in claim 8 is the digital signal transmission method according to claim 6, wherein the identification data generating step is based on the input uncompressed video data. Character information data including identification information is generated, and the character information data is used as identification data for the uncompressed video data.

  According to a ninth aspect of the present invention, in the digital signal transmission method according to any of the sixth to eighth aspects, the mapping step uses the compressed bitstream and the reduced video data as an effective video in a data structure of a video interface. It is characterized in that each region is mapped to a predetermined region.

  Furthermore, the invention described in claim 10 is the digital signal transmission method described in claims 6-8, wherein the mapping step uses the compressed bit stream and the reduced video data in an effective frame structure of a video interface. The video region is a predetermined region and is mapped to a predetermined bit of each pixel in the region.

  According to the present invention, the identification data of the uncompressed video data is generated together with the bit stream obtained by encoding the input uncompressed video data, and both data are appropriately mapped to the data structure and the frame structure of the video interface. Therefore, it is possible to easily confirm the contents of transmitted video data visually by displaying identification data information on a general video display device without the need for special measuring instruments or analyzers. become able to.

1 is a block diagram illustrating a first embodiment of a digital signal transmission device according to the present invention. It is the flow which showed 1st Embodiment of the transmission method of the digital signal which concerns on this invention. It is the figure which showed the example of mapping in 1st Embodiment of the digital signal transmission apparatus and digital signal transmission method which concern on this invention. It is the block diagram which showed 2nd Embodiment of the transmission apparatus of the digital signal which concerns on this invention. It is the flow which showed 2nd Embodiment of the transmission method of the digital signal which concerns on this invention. It is the schematic which showed the structure of the flame | frame and pixel in 2nd Embodiment of the digital signal transmission apparatus and digital signal transmission method concerning this invention. FIG. 5 is a diagram illustrating a mapping example in the second embodiment of the digital signal transmission apparatus and the digital signal transmission method according to the present invention, where (a) represents a first mapping pattern and (b) represents a second mapping pattern. ing. It is an example figure which showed the layout of digital frame space.

  A first embodiment of a digital signal transmission apparatus and digital signal transmission method according to the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a first embodiment of a digital signal transmission apparatus according to the present invention, and FIG. 2 is a flowchart showing a first embodiment of a digital signal transmission method according to the present invention. is there. FIG. 3 is a diagram showing a mapping example in the first embodiment of the digital signal transmission apparatus and digital signal transmission method according to the present invention.

  As for codes, 10 is a digital signal transmission device, 12 is a first encoding unit, 14 is a second encoding unit, 16 is a third encoding unit, 18 is a first reduced video generation unit, and 20 is The second reduced video generation unit, 22 the third reduced video generation unit, 24 the mapping unit, 26 the video interface, 28 the monitor, 30 the data separation unit, 32 the first decoding unit, and 34 the second The decoding unit 36 is a third decoding unit.

  First, as shown in FIG. 1, a digital signal transmission apparatus 10 according to the present embodiment encodes uncompressed video data that is input, and outputs a compressed bit stream. Based on the uncompressed video data respectively input to the encoding unit 14 and the third encoding unit 16, a first reduced video generation unit 18 that generates reduced video data as identification data for the uncompressed video data, 2, a reduced video generation unit 20 and a third reduced video generation unit 22.

  Further, the compressed bit stream output by each encoding unit (12, 14, 16) and the reduced video data generated by each reduced video generation unit (18, 20, 22) are used as effective video areas in the video interface 26. , A mapping unit 24 that performs mapping, and a monitor 28 that enables the reduced video data mapped by the mapping unit 24 to be visually recognized on the screen.

  Then, a data separation unit 30 that extracts each compressed bit stream mapped by the mapping unit 24, and a first decoding unit 32 that decodes each compressed bit stream extracted by the data separation unit 30 and outputs the result as video data. , A second decoding unit 34 and a third decoding unit 36 are provided. In the present embodiment, data input / output is made up of three channels. However, this does not limit the present invention.

  Next, the digital signal transmission apparatus and digital signal transmission method in this embodiment will be described in more detail with reference to FIG. First, the first to third encoding units (12, 14, 16) encode the input uncompressed video data, and the compressed bits of a predetermined data amount that can be mapped to the data structure of the video interface 26. A stream is output (step 1). For example, MPEG-2, AVC / H. A method such as H.264 is adopted.

  Next, or in parallel, the first to third reduced video generation units (18, 20, 22) generate reduced video (thumbnail video) data as identification data for the input uncompressed video data. (Step 2). For example, when the uncompressed video data is HDTV, the number of pixels in one frame is 1920 pixels in the horizontal direction and 1080 lines in the vertical direction. When the horizontal direction and the vertical direction are reduced to 1/4, the horizontal direction is 480 pixels, A reduced image of 1/16 size composed of 270 lines in the vertical direction is generated.

  Then, as shown in FIG. 3, reduced video data having a size of 1/16 is allocated to one of the 16 divided areas. In addition, since the area is divided in this way, a plurality of video inputs can be handled. In other words, the reduced video of each input video and the compressed bit stream can be allocated in a separate area. In the figure, there are four areas to which the reduced video is allocated. However, the present invention is not limited to this, and the area may be appropriately defined according to the number of video inputs.

  As for a method for reducing uncompressed video data, for example, a method of simply thinning out pixels (when reducing to 1/4, one pixel out of four pixels is left and the other three pixels are discarded), a bilinear method, or the like As described above, a method of performing interpolation processing using a plurality of neighboring pixels is adopted. Note that mosaic processing, blurring processing, scramble processing, and the like can also be performed to protect the copyright of the video.

  In addition, in the case of high-definition video such as 4K or 8K, this can be dealt with by changing the reduction ratio of reduced video generation. For example, in the case of 4840 video of 3840 × 2160, the horizontal direction and the vertical direction are reduced to 1/8. In this way, the size of each reduced video and the size of each bitstream area can be arbitrarily changed according to the required application such as image quality. It should be noted that control may be performed to reduce the gradation by reducing the black-and-white image with only the luminance signal or the number of quantization bits per pixel.

  Here, in the subsequent processing, in order to perform mapping to the data structure of the video interface 26, a frame memory for storing the reduced video is required as a buffer. This memory capacity varies depending on the size of the video and the mapping method. If the capacity is one frame, it can be mapped to the next frame of the video interface 26.

  Instead of the first to third reduced video generation units, character information generation units that generate character information data such as an input video format, compression method, channel number, and title name are used as identification data for uncompressed video data. The character information data arranged and generated may be mapped to the data structure of the video interface 26. Further, the first to third reduced video generation units and the character information generation unit may be provided, and the character information data may be mapped to the effective video area in the data structure of the video interface 26 together with the reduced video data.

  Subsequently, the mapping unit 24 maps the reduced video data of the uncompressed video data to the effective video area of the data structure of the video interface 26 (step 3, see FIG. 8). The reduced video data is allocated and stored in the effective video area of the video interface 26 in a raster scanning format that can be correctly displayed on the monitor 28.

  In addition, data such as a compressed bit stream is stored in a usable area in accordance with specifications such as a synchronization code and a prohibition code defined by the video interface 26. In addition, since a use area can be increased / decreased by changing the compression rate by the 1st-3rd encoding part (12, 14, 16), for example, some areas, such as audio | voice data, control data, etc. It is also possible to assign various data.

  The reduced video data is read from the frame memory of the reduced video according to the video format of the video interface 26 and mapped. When the input uncompressed video data and the frame frequency of the video interface 26 are different, the same frame is repeated several times or deleted to match the output format.

  In other words, even if the format of the input video data is 1080i60Hz, 1080p24Hz, mixed, or an uncommon system, the output video interface 26 is compatible with many video display devices such as 1080i60Hz. The frame frequency of the reduced video is to be converted by a method of repeatedly outputting the same frame several times or deleting it. As described above, if the purpose is to confirm the content of the transmitted video data, it is not necessary to strictly manage the synchronization between the reduced video and the frame frequency of the compressed bit stream, and so on. Even if it is not necessary, simple processing is sufficient.

  The compressed bit stream is mapped to the data structure of the video interface 26 in a separately defined format (step 3). Note that when areas are defined as shown in FIG. 3, the amount of data that can be allocated per area is as follows. Here, it is assumed that the video interface is 8 bits per pixel, the luminance color difference (YUV) format is 4: 2: 2, and the frame frequency is 30 Hz.

  In this case, if the bit rate of the compressed bit stream is 60 Mbps, it can be mapped to one area (see the following equation). If three areas are used, 180 Mbps mapping is possible.

  Since the bit stream is not always input to the mapping unit 24 at the same time as the mapping process, a buffer memory for accumulating the bit stream for a certain period may be required. The memory capacity varies depending on the bit rate variation (data amount density) of the bit stream and the mapping method.

  Subsequently, the reduced video data mapped by the mapping unit 24 is displayed as a reduced video on the screen of the monitor 28 through the video interface 26 so that the user can visually recognize it (step 4). Since the reduced video is displayed on the screen of the monitor 28 in this way, the video data that has been encoded (compressed) and transmitted can be decoded, or the contents can be displayed without using a special measuring instrument or analyzer. It can be easily grasped visually.

  Next, the data separation unit 30 extracts and outputs each compressed bit stream mapped to the data structure of the video interface 26 by the mapping unit 24 (step 5). When a plurality of bit streams are mapped as in the present embodiment, a plurality of outputs are performed.

  Then, the first to third decoding units (32, 34, 36) receive the compressed bit streams respectively output by the data separation unit 30, and are the same as the first to third encoding units (12, 14, 16). Each decoding process is performed according to the system, and the uncompressed video data is output (step 6).

  Next, a second embodiment of the digital signal transmission apparatus and digital signal transmission method according to the present invention will be described with reference to the drawings. FIG. 4 is a block diagram showing a second embodiment of the digital signal transmission apparatus according to the present invention, and FIG. 5 is a flowchart showing the second embodiment of the digital signal transmission method according to the present invention. is there.

  FIG. 6 is a schematic diagram showing the structure of frames and pixels in the second embodiment of the digital signal transmission apparatus and digital signal transmission method according to the present invention, and FIG. 7 is the digital signal according to the present invention. FIG. 6 is a diagram illustrating a mapping example in the second embodiment of the transmission apparatus and the digital signal transmission method, in which (a) represents a first mapping pattern and (b) represents a second mapping pattern. In addition, about a code | symbol, it is the same as that of FIG.

  First, as shown in FIG. 4, the digital signal transmission apparatus 10 according to the present embodiment encodes uncompressed video data that is input, and outputs a compressed bitstream. A first reduced video generation unit 18 and a second reduced video generation unit 20 that generate reduced video data as identification data for the uncompressed video data based on the uncompressed video data respectively input to the encoding unit 14. It has.

  Further, the compressed bit stream output by each encoding unit (12, 14) and the reduced video data generated by each reduced video generation unit (18, 20) are mapped to the effective video area in the video interface 26, respectively. And a monitor 28 that makes the reduced video data mapped by the mapping unit 24 visible on the screen.

  Then, a data separation unit 30 that extracts each compressed bit stream mapped by the mapping unit 24, and a first decoding unit 32 that decodes each compressed bit stream extracted by the data separation unit 30 and outputs the result as video data. The second decoding unit 34 is provided. In the present embodiment, data input / output is made up of two channels, but this is not intended to limit the present invention.

  Next, the digital signal transmission apparatus and digital signal transmission method in this embodiment will be described in more detail with reference to FIG. First, the first to second encoding units (12, 14) encode each input uncompressed video data, and generate a compressed bit stream having a predetermined data amount that can be mapped to the data structure of the video interface 26. Output (step 1). For example, MPEG-2, AVC / H. A method such as H.264 is adopted.

  Next, or in parallel, the first and second reduced video generation units (18, 20) generate reduced video (thumbnail video) data as identification data for the input uncompressed video data. (Step 2). For example, when the uncompressed video data is HDTV, the number of pixels in one frame is 1920 pixels in the horizontal direction and 1080 lines in the vertical direction. When the horizontal direction and the vertical direction are reduced to 1/4, the horizontal direction is 480 pixels, A reduced image of 1/16 size composed of 270 lines in the vertical direction is generated.

  Further, the pixels constituting the frame have gradations (also referred to as depth and depth), and the quantization level is represented by the number of bits such as 8 bits (256 gradations) or 10 bits (1024 gradations). Is done. The larger the number of bits, the finer the gradation can be expressed (the image quality becomes better). Conversely, the smaller the number of bits, the more the gradation becomes rough (the image quality becomes worse).

  As for a method for reducing uncompressed video data, for example, a method of simply thinning out pixels (when reducing to 1/4, one pixel out of four pixels is left and the other three pixels are discarded), a bilinear method, or the like As described above, a method of performing interpolation processing using a plurality of neighboring pixels is adopted. Note that mosaic processing, blurring processing, scramble processing, and the like can also be performed to protect the copyright of the video.

  In addition, in the case of high-definition video such as 4K or 8K, this can be dealt with by changing the reduction ratio of reduced video generation. For example, in the case of 4840 video of 3840 × 2160, the horizontal direction and the vertical direction are reduced to 1/8. In this way, the size of each reduced video and the size of each bitstream area can be arbitrarily changed according to the required application such as image quality. It should be noted that control may be performed to reduce the gradation by reducing the black-and-white image with only the luminance signal or the number of quantization bits per pixel.

  Here, in the subsequent processing, in order to perform mapping to the frame structure of the video interface 26, a frame memory for storing reduced video is required as a buffer. This memory capacity varies depending on the size of the video and the mapping method. If the capacity is one frame, it can be mapped to the next frame of the video interface 26.

  In addition, as shown in FIG. 6, in the video layer, since the number of quantization bits is reduced for mapping (bits 4 to 7), only necessary bits are stored, thereby reducing memory capacity and circuit scale. It is possible. Further, if the number of quantization bits is reduced, the gradation change becomes rough and uncomfortable, so dither processing (color reduction processing) may be performed to reduce such uncomfortable feeling.

  In place of the first and second reduced video generation units, character information generation units that generate character information data such as an input video format, compression method, channel number, title name, etc. are used as identification data for uncompressed video data. The character information data arranged and generated may be mapped to the frame structure of the video interface 26. Further, the first and second reduced video generation units and the character information generation unit may be provided, and the character information data may be mapped to the effective video area in the frame structure of the video interface 26 together with the reduced video data.

  Subsequently, the mapping unit 24 maps the reduced video data of the uncompressed video data to predetermined bits of the pixels in the effective video area of the frame structure of the video interface 26 (see step 3, FIG. 8). The reduced video data is allocated and stored in the effective video area of the video interface 26 in a raster scanning format that can be correctly displayed on the monitor 28.

  In addition, data such as a compressed bit stream is allocated and stored in predetermined bits of a pixel in a usable area in accordance with specifications such as a synchronization code and a prohibition code defined by the video interface 26. In addition, since a use area | region can be increased / decreased by changing the compression rate by the 1st-2nd encoding part (12,14), some areas, such as audio | voice data, control data, etc., are various, for example. It is also possible to assign data.

  The reduced video data is read from the frame memory of the reduced video according to the video format of the video interface 26 and mapped. When the input uncompressed video data and the frame frequency of the video interface 26 are different, the same frame is repeated several times or deleted to match the output format.

  In other words, even if the format of the input video data is 1080i60Hz, 1080p24Hz, mixed, or an uncommon system, the output video interface 26 is compatible with many video display devices such as 1080i60Hz. The frame frequency of the reduced video is to be converted by a method of repeatedly outputting the same frame several times or deleting it. As described above, if the purpose is to confirm the content of the transmitted video data, it is not necessary to strictly manage the synchronization between the reduced video and the frame frequency of the compressed bit stream, and so on. Even if it is not necessary, simple processing is sufficient.

  The compressed bit stream is mapped to the frame structure of the video interface 26 in a separately defined format (step 3). As shown in FIG. 6, when 4 bits are used for the bitstream layer, the amount of data that can be allocated is as follows. Here, the video interface is assumed to be horizontal 1920 pixels × 1080 pixels, only the luminance signal (no color difference signal), and the frame frequency is 30 Hz.

  In this case, if the bit rate of the compressed bit stream is set to 60 Mbps, four types of bit streams can be mapped (see the following formula).

  Since the bit stream is not always input to the mapping unit 24 at the same time as the mapping process, a buffer memory for accumulating the bit stream for a certain period may be required. The memory capacity varies depending on the bit rate variation (data amount density) of the bit stream and the mapping method.

  Here, an example of mapping of the video interface 26 of the mapping unit 24 to the frame structure will be described with reference to FIGS. First, in the example shown in (a), the upper 4 bits (see FIG. 6) of the video layer divide the frame into left and right halves, and the lower 4 bits (see FIG. 6) of the bitstream layer are not divided into left and right. In addition, the compressed bit stream of video 1 and video 2 is divided into two layers (bit stream layer 1 and bit stream layer 2) each having 2 bits (bit 0 and bit 1 and bit 2 and bit 3). Assigned to separate layers.

  In the example shown in (a) above, in the upper 4 bits of the video layer, one frame is divided into right and left, the left side is the video 1 area, and the right side is the video 2 area. The division method can be arbitrarily determined. In this example, on the left side, the reduced video of the generated video 1 and the upper 4 bits (reduced color image) of a part of the clipped video are assigned to the left video layer, and on the right side, the generated video 2 is reduced. The upper 4 bits (color-reduced image) of the pixels of the video or a part of the cut-out video are allocated to the right video layer.

  Subsequently, in the example shown in (b), the upper 4 bits of the video layer are the same as the example shown in (a), but the lower 4 bits (see FIG. 6) of the bitstream layer are higher 4 bits. As with, it is divided into two equal parts. In other words, the compressed bit stream of video 1 is allocated to the left side (bit stream layer 1) of the lower 4 bits, and the compressed bit stream of video 2 is allocated to the right side (bit stream layer 2). In the present embodiment, the upper 4 bits are the video layer and the lower 4 bits are the bit stream layer, but the present invention is not limited to this.

  The generation method, size, cutout position, number of bits to be enabled, bit position, and video layer and bitstream layer configuration can be changed according to the display method, image quality, bit rate, etc. It is. Further, it may be a black and white image having only a luminance signal.

  Subsequently, the reduced video data mapped by the mapping unit 24 is displayed as a reduced video on the screen of the monitor 28 through the video interface 26 so that the user can visually recognize it (step 4). Since the reduced video is displayed on the screen of the monitor 28 in this way, the video data that has been encoded (compressed) and transmitted can be decoded, or the contents can be displayed without using a special measuring instrument or analyzer. It can be easily grasped visually.

  Next, the data separation unit 30 extracts and outputs each compressed bit stream mapped to the frame structure of the video interface 26 by the mapping unit 24 (step 5). When a plurality of bit streams are mapped as in the present embodiment, a plurality of outputs are performed.

  Then, the first and second decoding units (32, 34) receive the compressed bit streams respectively output by the data separation unit 30, and in the same manner as the first and second encoding units (12, 14), respectively. A decoding process is performed and output as uncompressed video data (step 6).

  Since the digital signal transmission apparatus and digital signal transmission method according to the present invention can easily see the content of the video data being transmitted on a monitor, special measuring instruments and analysis apparatuses are prepared. It can be suitably used at a site where there is not.

10 Digital Signal Transmission Device 12 First Encoding Unit 14 Second Encoding Unit 16 Third Encoding Unit 18 First Reduced Image Generation Unit 20 Second Reduced Image Generation Unit 22 Third Reduced Image Generation Unit 24 Mapping Unit 26 video interface 28 monitor 30 data separation unit 32 first decoding unit 34 second decoding unit 36 third decoding unit

Further, an invention according to claim 4, wherein a transmission apparatus for digital signals according to claim 2, wherein the mapping section, the compression bitstream, the effective image area of the reduced image data in the data structure of the video interface Of these, each is mapped to a predetermined area.

The invention according to claim 5 is the digital signal transmission apparatus according to claim 2 , wherein the mapping unit converts the compressed bit stream and the reduced image data into an effective image area in a frame structure of a video interface. Of these, a predetermined area is mapped to a predetermined bit of each pixel in the area.

A ninth aspect of the present invention is the digital signal transmission method according to the seventh aspect , wherein the mapping step includes: the compressed bit stream; and the reduced video data in an effective video area in a data structure of a video interface. Of these, each is mapped to a predetermined area.

The digital signal transmission method according to claim 10 is the digital signal transmission method according to claim 7 , wherein the mapping step uses the compressed bit stream and the reduced video data as an effective video area in a frame structure of a video interface. Among these, a predetermined area is mapped to a predetermined bit of each pixel in the area.

Claims (10)

An encoding unit that encodes the input uncompressed video data and outputs a compressed bitstream;
An identification data generation unit that generates identification data for the uncompressed video data based on the input uncompressed video data;
A mapping unit that maps the compressed bit stream output by the encoding unit and the identification data generated by the identification data generation unit to an effective video area in a video interface;
A monitor that makes the identification data mapped by the mapping unit visible on the screen;
A data separation unit for extracting the compressed bitstream mapped by the mapping unit;
A decoding unit that decodes the compressed bitstream extracted by the data separation unit and outputs the decoded data as video data;
A digital signal transmission apparatus comprising:   2. The digital signal transmission device according to claim 1, wherein the identification data generation unit generates reduced video data of the uncompressed video data based on the input uncompressed video data. .   2. The digital signal according to claim 1, wherein the identification data generates character information data including identification information of the uncompressed video data based on the input uncompressed video data. Transmission equipment.   The mapping unit is configured to map the compressed bit stream and the reduced video data to predetermined areas in an effective video area in a data structure of a video interface, respectively. The digital signal transmission device according to any one of claims 1 to 3.   The mapping unit is a predetermined area in the effective video area in the frame structure of the video interface for the compressed bit stream and the reduced video data, and for a predetermined bit of each pixel in the area The digital signal transmission apparatus according to claim 1, wherein the mapping is performed respectively. An encoding step of encoding input uncompressed video data and outputting a compressed bitstream;
An identification data generation step for generating identification data for the uncompressed video data based on the input uncompressed video data;
A mapping step of mapping the compressed bit stream output by the encoding step and the identification data generated by the identification data generation step to an effective video area in a video interface;
A data display step for displaying the identification data mapped in the mapping step on the screen of the monitor so as to be visible;
A data separation step of extracting the compressed bitstream mapped by the mapping unit;
A decoding step of decoding the compressed bitstream extracted in the data separation step and outputting as video data;
A method for transmitting a digital signal, comprising:   The identification data generation step generates reduced video data of the uncompressed video data based on the input uncompressed video data, and uses the reduced video data as identification data for the uncompressed video data. The digital signal transmission method according to claim 6, wherein:   The identification data generation step generates character information data including identification information of the uncompressed video data based on the input uncompressed video data, and the character information data is used to identify the uncompressed video data. 7. The digital signal transmission method according to claim 6, wherein the digital signal transmission step is data.   The mapping step is characterized in that the compressed bit stream and the reduced video data are respectively mapped to predetermined areas in an effective video area in a data structure of a video interface. The digital signal transmission method according to any one of claims 6 to 8.   In the mapping step, the compressed bit stream and the reduced video data are predetermined areas of the effective video area in the frame structure of the video interface, and the predetermined bit of each pixel in the area is determined. 9. The digital signal transmission method according to any one of claims 6 to 8, wherein the mapping is performed respectively.

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