JP6553964B2 - Video signal transmitting apparatus and video signal receiving apparatus - Google Patents

Description

  The present invention relates to a video signal transmitting apparatus that transmits a video signal to a transmission path, and a video signal receiving apparatus that receives a video signal from the transmission path.

  In digital television broadcasting provided from a broadcasting station to each home, it is common to compress and encode a video signal in order to increase the efficiency of the occupied frequency and transmission bit rate. On the other hand, in the case of wired transmission between studio devices in a broadcasting station or between studios, non-compressed transmission is often used so as not to cause image quality deterioration and delay.

  Conventionally, a technique of quantizing a luminance / color difference signal of each pixel constituting an image with 10 bits or less has been mainly used for an uncompressed digital high-definition signal in a broadcasting station. As an interface corresponding to this signal, the ST29 standard is defined by SMPTE (American Institute of Motion Picture and Television Engineers), and HD-SDI (High Definition-Serial Digital Interface) is used to connect studio devices. Widely used.

  In recent years, research and development of 4K images having 4 times the pixels of Hi-Vision (registered trademark) and 8K images having 16 times the pixels have been actively promoted. In 2012, ITU-R (International Telecommunication Union, Radio Communication Division) will conduct BT. 2020 was recommended. In Japan, STD-B56 has been standardized by the Radio Industries Association (hereinafter referred to as ARIB). Furthermore, in March 2014, STB-ST58 was standardized by ARIB as an inter-device interface capable of transmitting all the images defined in STD-B56.

  The STD-B58 standard specifies that a 4K / 8K video signal is transmitted using 3 to 24 10G link signals with an optical signal of about 10.7 Gbps as a transmission unit. Unlike the HD-SDI signal, the 10G link signal defined by STD-B58 employs a frame structure with 12 bits as one word.

  On the other hand, in the communication field, 100 Gbps 100 Gigabit Ethernet has been standardized by IEEE 802.3, and has already been widely used in business applications such as data center or trunk line communication. In addition, standardization work for the next-generation 400 Gigabit Ethernet is also in progress.

  Commercial communication equipment has more users than commercial broadcast equipment, and the cost reduction is expected to proceed at an early stage. Is expected.

  From such a background, in the broadcasting service, attention has been focused on a technique of transmitting a non-compressed video signal using a communication device, and development is in progress (see, for example, Patent Document 1 and Non-patent Document 1).

JP 2013-110454 A

Junichiro Kawamoto, Go Nakatogawa, Koyuki Koyamada, "Development of uncompressed super high-vision signal transmission technology using 100 Gigabit Ethernet", IEICE technical report, CS communication system, vol. 114, no. 119, CS 2014- 28, 2014, p.67-72

  The uncompressed video signal used in the broadcasting service is a large capacity signal reaching 1.2 Gbps or more in the case of high vision (registered trademark) and reaching up to 144 Gbps in the case of 8K video. In order to transmit this non-compressed video signal using a communication device, there is a problem that an expensive large-capacity communication line and device are required.

  In addition, in order to improve the efficiency of expenses, when using a best-effort type (line format that does not guarantee the transmission bit rate and that may cause an error) and a device, it is important in a general transmission method. An error may occur in the data. In order to perform stable transmission on a best effort type circuit, it is necessary to use an error correction code with high correction performance. For this reason, complicated signal processing is required and the apparatus becomes large, and there is a possibility that the apparatus can not be accommodated in a limited space such as a relay vehicle, which causes a problem of high power consumption and high cost.

  In addition, distribution control based on the priority of data is used in order to realize stable transmission by selecting particularly important data from various transmission data. However, there is a problem that expensive lines and devices are required because the number of switches and routers that support priority-based control is limited.

  Therefore, the present invention has been made to solve the above problems, and an object thereof is to realize transmission of a large-capacity video signal at low cost without performing complicated signal processing, and to achieve image quality due to the occurrence of an error. It is an object of the present invention to provide a video signal transmitting apparatus and a video signal receiving apparatus that can suppress adverse effects on the image.

In order to solve the above problem, a video signal transmitting apparatus according to claim 1 is a video signal transmitting apparatus for transmitting a video signal through M (M is an integer of 1 or more) transmission paths having different error rates. Of the plurality of bit data constituting the video signal, upper order bit data is defined to correspond to the transmission line having a low error rate, and lower order bit data is defined to correspond to the transmission line having a high error rate. A video bit string separation unit that separates a plurality of bit data constituting the video signal and generates N (N is an integer greater than M and an integer of 2 or more) bit strings in accordance with the above rules; A packet conversion unit that converts the N bit strings thus converted into N packet signals corresponding to a communication method of the corresponding transmission path, and the N packets converted by the packet conversion unit Packet multiplexing unit for multiplexing a plurality of packet signals to be multiplexed, packet signals excluding the plurality of packet signals to be multiplexed among the N packet signals converted by the packet conversion unit, A transmission path encoding section that performs transmission path encoding on the packet signal multiplexed by the packet multiplexing section according to the communication scheme of the corresponding transmission path, and the transmission path encoding is performed. Transmitting signals via the corresponding transmission path.

A video signal transmitting apparatus according to a second aspect of the present invention is a video signal transmitting apparatus for transmitting a video signal through M (M is an integer of 1 or more) transmission paths having the same error rate, wherein the video signal is configured. Corresponds to the error correction coding processing using the code of the correction performance with the lower bit data corresponding to the error correction coding processing using the code of the high correction performance among the plurality of bit data A plurality of bit data constituting the video signal is separated according to a rule defined so as to generate N bit strings (N is an integer greater than or equal to 2 greater than M) corresponding to the error correction coding process Video bit string separation unit, and a packet conversion unit for converting the N bit strings generated by the video bit string separation unit into N packet signals according to the communication system of the corresponding transmission path , Out of the N packet signals converted by the packet conversion unit, a packet signal including the higher-order bit data is subjected to error correction encoding processing with a code of high correction performance, and the lower-order side An error correction encoding unit that performs error correction encoding processing with a low correction performance code on a packet signal including bit data, and N packets that have been subjected to error correction encoding processing by the error correction encoding unit Among the signals, a packet multiplexing unit that multiplexes a plurality of packet signals to be multiplexed, and a plurality of packets to be multiplexed among N packet signals that have been subjected to error correction coding processing by the error correction coding unit Transmission line coding for packet signals excluding signals and packet signals multiplexed by the packet multiplexing unit according to the communication system of the corresponding transmission line Comprising an encoding unit, and the channel coding are M transmission signals made, transmitted via a corresponding said transmission path, characterized in that.

The video signal receiving apparatus according to claim 3, the video signal transmitter according to claim 1, M-number of the error rate is different (M is an integer of 1 or more) M number of transmission signal transmitted via the transmission path A transmission path decoding unit that performs transmission path decoding according to a communication scheme of the corresponding transmission path for the M transmission signals, and generates M packet signals; A packet separation unit that separates a plurality of original packet signals from the multiplexed packet signal of the M packet signals generated by the transmission line decoding unit, and the M pieces of M generated by the transmission line decoding unit Among packet signals, packet signals not to be separated by the packet separation unit and packet signals separated by the packet separation unit are converted again into N (N is an integer greater than M and an integer of 2 or more) bit strings Among the plurality of bit data constituting the video signal, the upper bit data corresponds to the transmission path having a low error rate, and the lower bit data corresponds to the transmission path having a high error rate And a video bit string combining unit for combining the N bit strings reconverted by the packet reconversion unit according to a reverse rule of a rule defined to correspond to generate the video signal. It features.

A video signal receiving apparatus according to a fourth aspect of the present invention is the video signal transmitting apparatus according to the second aspect , wherein the M transmission signals are transmitted via M (M is an integer of 1 or more) transmission paths having different error rates. A transmission path decoding unit that performs transmission path decoding according to a communication scheme of the corresponding transmission path for the M transmission signals, and generates M packet signals; A packet separation unit that separates a plurality of original packet signals from the multiplexed packet signal of the M packet signals generated by the transmission line decoding unit, and the M pieces of M generated by the transmission line decoding unit Among packet signals, packet signals that are not subject to separation by the packet separation unit and packet signals separated by the packet separation unit are higher than packet signals that include bit data on the upper side. An error correction decoding unit that performs error correction decoding processing with a correction performance code and performs error correction decoding processing with a low correction performance code on a packet signal including lower-order bit data, and the error correction decoding unit A packet reconversion unit that reconverts N (N is an integer of 2 or more integers greater than M) packet signals subjected to error correction decoding processing into N bit strings, and a plurality of bit data forming the video signal Among the above, the upper bit data is defined to correspond to the error correction coding process using the code with high correction performance, and the lower bit data is defined to correspond to the error correction coding process using the code with low correction performance. A video bit string synthesizing unit that synthesizes the N bit strings re-converted by the packet re-conversion unit according to a rule reverse to the rule, and generates the video signal. To.

  As described above, according to the present invention, transmission of a large-capacity video signal can be realized inexpensively without performing complicated signal processing, and an adverse effect on the image quality due to the occurrence of an error can be suppressed. .

1 is a block diagram illustrating a configuration example of a video signal transmission apparatus according to Embodiment 1. FIG. It is a figure explaining the separation process in the example of the quantized video data. FIG. 3 is a diagram illustrating a continuation of FIG. 2. It is a figure explaining the separation | isolation processing by a video bit string separation part. It is a figure explaining a general packetization method (prior art). 1 is a block diagram illustrating a configuration example of a video signal receiving device according to Embodiment 1. FIG. FIG. 6 is a block diagram illustrating a configuration example of a video signal transmission apparatus according to a second embodiment. FIG. 6 is a block diagram illustrating a configuration example of a video signal receiving apparatus according to a second embodiment. FIG. 10 is a block diagram illustrating a configuration example of a video signal transmission apparatus according to a third embodiment. 10 is a block diagram illustrating a configuration example of a video signal receiving apparatus according to Embodiment 3. FIG. FIG. 10 is a block diagram illustrating a configuration example of a video signal transmission apparatus according to a fourth embodiment. FIG. 10 is a block diagram illustrating a configuration example of a video signal receiving apparatus according to a fourth embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In general, quantized digital video data has a difference in significance between bits, and higher bits are more likely to detect data errors than lower bits. When the video in which the data error has occurred in the upper bit and the video in which the data error has occurred in the lower bit are compared, the person who looks at the video is more likely to feel uncomfortable with the former.

  In the present invention, the higher order bits of the video signal are handled as more important data, the higher order bits and the lower order bits of the video signal are separated, and each is converted into a packet. Then, in the present invention, when transmitting a video signal through a plurality of transmission paths of different quality, a packet in which the upper bit of the video signal is stored is transmitted through a transmission path of high quality and the lower order of the video signal A packet in which bits are stored is transmitted through a low-quality transmission path. Further, in the present invention, when transmitting through a plurality of transmission paths with almost equal quality, a packet in which the upper bits are stored is error correction coded with a code of high correction performance and transmitted, and the lower bits are stored. The packets are error-corrected with a low correction performance code and transmitted.

  Hereinafter, Examples 1-4 will be described. Both of the first and second embodiments are examples assuming that video signals are transmitted through a plurality of transmission paths of different qualities, and the second embodiment is applicable to a configuration in which the number of transmission paths is small. Both of the third and fourth embodiments are examples assuming that video signals are transmitted through a plurality of transmission paths of substantially the same quality, and the fourth embodiment is applied to a configuration in which the number of transmission paths is small.

Example 1
First, the first embodiment will be described. In the first embodiment, on the premise of a plurality of transmission paths of different qualities, a packet in which the upper bits of the video signal are stored is transmitted via a high quality transmission path, and a packet in which the lower bits of the video signal are stored , Is an example of transmission via a low quality transmission path.

(Video signal transmitter / Example 1)
The video signal transmission apparatus according to the first embodiment will be described in detail. FIG. 1 is a block diagram showing an example of the configuration of a video signal transmission apparatus according to the first embodiment. The video signal transmission device 1-1 includes a video bit string separation unit 11, N packet conversion units 12-1 to 12-N, and N transmission path encoding units 13-1 to 13-N. . N is an integer of 2 or more.

  The video signal transmission device 1-1 separates a video signal to be transmitted into N video signals, and the N video signals separated from the video signal transmission device 1-1 are transmitted through transmission lines 30-1 to 30-. N is transmitted to the video signal receiving apparatus 2-1 to be described later.

  It is assumed that the transmission lines 30-1 to 30-N have different qualities or different qualities. For example, the transmission path 30-1 is the transmission path of the highest quality, the transmission path 30-2 is the transmission path of the second highest quality, ..., and the transmission path 30-N is the transmission path of the lowest quality. Define as follows.

  Here, the quality of the transmission line is determined by the error rate (error occurrence probability) of the communication line. The transmission line with a low error rate of the communication line has high quality, and the transmission line with a high error rate has low quality. For example, when transmitting a wavelength division multiplexed packet signal using one optical fiber, the signal power to noise power ratio (SN ratio) of the transmission path differs for each wavelength. For this reason, the transmission path of each wavelength in which the packet signal is transmitted can be handled as the transmission paths 30-1 to 30-N. That is, the transmission paths 30-1 to 30-N are one optical fiber and are transmission paths corresponding to the respective wavelengths, and the higher the SN ratio, the higher the quality.

  The video bit string separation unit 11 inputs a video signal to be transmitted, and according to a preset rule, a plurality of bit data constituting video data which is a video signal is converted to the quality of the transmission paths 30-1 to 30-N. Accordingly, N (N channels) bit strings are generated so that the upper bit data corresponds to a high quality transmission path and the lower bit data corresponds to a low quality transmission path. The separation number N is a number corresponding to the transmission lines 30-1 to 30-N.

  The N series of bit strings generated by the video bit string separation unit 11 are input to the corresponding packet conversion units 12-1 to 12-N. That is, the first bit string is input to the packet converter 12-1, the second bit string is input to the packet converter 12-2, ..., the Nth bit string is the packet converter 12-N. Is input.

  Here, the video signal to be transmitted is a quantized digital video signal, for example, a signal defined in ARIB STD-B58.

  For example, as a preset rule, a plurality of bit data (a series of bit data from upper bits to lower bits) constituting video data which is a video signal are transmitted through transmission paths 30-1 to 30-N. Rule to equally divide into N groups (groups for the number of transmission lines 30-1 to 30-N) corresponding to the transmission lines 30-1 to 30-N according to the quality of Is defined.

  If the transmission line 30-1 has the highest quality, the quality sequentially decreases from the transmission line 30-1 to the transmission line 30-N, and the transmission line 30-N has the lowest quality, the transmission line 30-1 is selected. The corresponding bit string is generated so as to be composed of upper bit data in the video data, and the bit string corresponding to the transmission path 30 -N is generated so as to be composed of lower bit data. That is, as the quality of the transmission paths 30-1 to 30-N is higher, a bit string composed of higher order bit data in video data is generated, and as the quality is lower, a bit string composed of lower order bit data is generated.

  Further, for example, as a preset rule, a plurality of bit data (a series of bit data from the upper bits to the lower bits) constituting video data which is a video signal are transmitted through transmission paths 30-1 to 30. -N according to the quality of -N, corresponding to N groups (groups of transmission lines 30-1 to 30-N) corresponding to transmission paths 30-1 to 30-N, and transmission paths 30-1 to 30-N A rule is defined that separates the bit lengths to be proportional to the transmission speed of N and generates N bit strings.

  The transmission path 30-1 has the highest quality and high speed (capable of high speed transmission), and the quality sequentially decreases from the transmission path 30-1 to the transmission path 30-N, and the transmission path 30-1 to the transmission path 30 If the speed becomes slower in order to N and the transmission path 30-N has the lowest quality and low speed (the transmission can only be performed at low speed), the bit string corresponding to the transmission path 30-1 is the upper side in the video data. The bit string is generated so as to have a long bit length, and the bit string corresponding to the transmission path 30-N is formed so as to have a lower bit length and is formed so as to have a short bit length. That is, as the quality of the transmission paths 30-1 to 30-N is higher, a bit string composed of higher order bit data in video data is generated, and as the quality is lower, a bit string composed of lower order bit data is generated. A bit string having a longer bit length is generated as the transmission speed of the transmission paths 30-1 to 30-N is higher, and a bit string having a shorter bit length is generated as the transmission speed is lower.

  By using this rule, higher-order bit data having a large influence on video is allocated to a high-quality transmission path, and a large amount of bit data is allocated to a high-speed transmission path. It can be transmitted efficiently.

  Further, for example, as a preset rule, a plurality of bit data (a series of bit data from the upper bits to the lower bits) constituting video data which is a video signal are transmitted through transmission paths 30-1 to 30. A rule is defined that generates N bit strings by separating the bit lengths into preset N lengths. In this case, it may be separated into N bit strings having different bit lengths.

  By using this rule, the operator can freely set the bit length for each of the transmission paths 30-1 to 30-N, so that it is possible to realize transmission of video signals with a high degree of freedom.

  The packet conversion units 12-1 to 12-N receive the corresponding bit string from the video bit string separation unit 11, and transmit the bit string to a packet having a transmission frame structure according to the communication system of the corresponding transmission line 30-1 to 30-N. Convert to signal. For example, when the communication method of the transmission line 30-1 is Ethernet (registered trademark), the packet conversion unit 12-1 converts the bit string into a packet signal (Ethernet packet) having a transmission frame structure of Ethernet (registered trademark). .

  The packet signals converted by the packet conversion units 12-1 to 12-N are input to the corresponding transmission path coding units 13-1 to 13-N.

  The transmission path encoding units 13-1 to 13-N receive the packet signals from the corresponding packet conversion units 12-1 to 12-N, and the corresponding transmission paths 30-1 to 30-N are associated with the packet signals. Transmission path encoding according to the communication method is performed. For example, when the communication system of the transmission line 30-1 is 10 Gigabit Ethernet, the transmission line coding unit 13-1 performs 64B / 66B coding on the packet signal.

  Signals encoded on the transmission path by the transmission path encoding units 13-1 to 13-N are transmitted to the video signal receiving device 2-1 described later via the corresponding transmission paths 30-1 to 30-N as transmission signals. Sent.

(Video bit string separation unit 11)
Next, the video bit string separation unit 11 shown in FIG. 1 will be described in detail. FIG. 2 is a diagram for explaining separation processing in an example of quantized video data, and FIG. 3 is a diagram for explaining the continuation of FIG. The quantized video data is a video signal input by the video bit string separation unit 11.

  A 12-bit quantized Y data sequence defined in ARIB STD-B 56 will be described as an example of quantized video data which is a video signal. In the following, video data in accordance with the ARIB standard will be described for specific explanation, but the video signal of the present invention is not limited to video data in the ARIB standard. The present invention can be applied to, for example, linear quantized data or nonlinear quantized data, but is not applied to video data having different bit lengths according to data generation probabilities, such as entropy coding.

  The Y data series is obtained by quantizing the luminance signal of the video. As shown in FIG. 2, in the definition of STD-B56, the black level of the 12-bit quantized Y data sequence is set to 256 (decimal number) and the peak level is set to 3760 (decimal number). As shown in FIG. 3, a 12-bit quantized Y data sequence is treated equally to 12-bit video data by stuffing low-order 2 bits with zero during 10-bit quantization.

  In the case of video data of a 12-bit quantized Y data series, when an error of 1 bit occurs, if the error is the least significant bit, the luminance difference between the right and wrong data is only 1 (decimal number). On the other hand, if the error is the most significant bit, the luminance difference between the right and wrong data is 2048 (decimal number), and the degree of influence of the 1-bit error is largely different. That is, as shown in FIG. 3, the influence of the bit error increases as the upper bits out of the 12 bits constituting the video data, and the influence of the bit errors decreases as the lower bits.

  Therefore, in the first embodiment of the present invention, paying attention to this point, the most significant bit of the quantization bit is regarded as the most significant bit, and the video signal on the upper bit side is transmitted through the transmission path of high quality. Bit video signals are transmitted via a low-quality transmission line. This makes it possible to minimize the influence of bit errors in the transmission path on the image quality.

  FIG. 4 is a diagram for explaining separation processing by the video bit string separation unit 11. As shown in FIG. 4, the video bit string separation unit 11 separates a plurality of bit data on the highest order side from 12-bit data constituting quantized video data which is a video signal, and generates a bit string for the first packet. Generate. Further, the video bit string separation unit 11 separates the plurality of bit data on the upper side next to generate a bit string for the second packet, and similarly separates the plurality of bit data on the lowermost side, and generates the Nth packet. Generate a bit string for

  FIG. 5 is a diagram for explaining a general packetization technique (prior art). In the conventional packetization technique, the quantized video data is sequentially packetized. For this reason, there is an advantage that it is excellent in low delay property. However, in the most significant bit and the least significant bit of the quantized video data, the probability that an error occurs is equal. For this reason, there is a disadvantage that even a slight bit error can not exclude the case of being detected as a video error.

  As described above, in the first embodiment of the present invention, the upper bit data of the video data is separated by the video bit string separation unit 11 so as to correspond to the transmission path with high quality, and the lower bit data is It is separated to correspond to a low quality transmission line. This eliminates the need for complicated signal processing such as processing using an error correction code, allows the apparatus to be accommodated in a limited space such as a relay car without increasing the size, and reduces power consumption. be able to. The upper bit data is transmitted through a high quality transmission line, and the lower bit data is transmitted through a low quality transmission line.

  As described above, according to the video signal transmission device 1-1 of the first embodiment, the video bit string separation unit 11 transmits a plurality of bit data forming video data which is a video signal according to a preset rule. N pieces are separated according to the quality of the paths 30-1 to 30-N, so that the upper bit data corresponds to a high quality transmission path and the lower bit data corresponds to a low quality transmission path (N systems) bit strings are generated. Then, the packet conversion units 12-1 to 12-N convert the corresponding bit string into a packet signal, and the transmission path encoding units 13-1 to 13-N perform transmission path encoding on the corresponding packet signal.

  As a result, the transmission path encoded signal is transmitted to the video signal receiving apparatus 2-1 described later via the transmission paths 30-1 to 30-N having different qualities. Then, the video signal receiving device 2-1 restores the original video signal by performing a process reverse to that of the video signal transmitting device 1-1 on the transmission path coded signal.

  Therefore, practical video transmission can be realized using a part of inexpensive communication lines with a high bit error rate, without using a transmission line of an expensive band guarantee type high speed communication line. In general, a line with a very low bit error rate (bandwidth guaranteed communication line) is more expensive than a line with a relatively high bit error rate. However, since it is not necessary to transmit all the video data using a bandwidth guaranteed communication line, transmission using an economical line can be realized. Furthermore, since it is not necessary to change the communication devices such as switches or routers existing in the middle of the transmission paths 30-1 to 30-N, the introduction of the video signal transmission device 1-1 becomes easy, and It can be cheaper. Further, compared to transmission using compression encoding processing, the video signal transmission apparatus 1-1 itself can be simplified, and operation efficiency at a program production site can be improved by reducing power consumption and saving space. .

  That is, transmission of a large-capacity video signal can be realized at low cost without performing complicated signal processing, and adverse effects on image quality due to occurrence of errors can be suppressed.

(Video signal receiving apparatus / Example 1)
Next, the video signal receiving apparatus according to the first embodiment will be described in detail. FIG. 6 is a block diagram showing a configuration example of the video signal receiving apparatus of the first embodiment. The video signal receiving device 2-1 includes N transmission path decoding units 21-1 to 21-N, N packet re-conversion units 22-1 to 22-N, and a video bit string synthesis unit 23. . N is an integer of 2 or more.

  The video signal receiving device 2-1 receives the transmission signal transmitted from the video signal transmitting device 1-1 via the transmission paths 30-1 to 30-N, and the transmission path decoding units 21-1 to 21-N The transmission signals received from the corresponding transmission lines 30-1 to 30-N are input. The transmission path decoding units 21-1 to 21-N perform the reverse processing of the corresponding transmission path coding units 13-1 to 13-N of the video signal transmission device 1-1 shown in FIG. Specifically, the transmission path decoding units 21-1 to 21-N perform transmission path decoding on the transmission signal according to the communication method of the corresponding transmission paths 30-1 to 30-N, and corresponding transmission paths. A packet signal having a transmission frame structure corresponding to the communication schemes 30-1 to 30-N is generated.

  Packet signals that have been subjected to transmission path decoding by the transmission path decoding units 21-1 to 21-N are input to the corresponding packet re-conversion units 22-1 to 22-N.

  The packet re-conversion units 22-1 to 22-N receive the packet signals from the corresponding transmission line decoding units 21-1 to 21-N, and the corresponding packet conversions of the video signal transmission device 1-1 illustrated in FIG. The reverse process of the units 12-1 to 12-N is performed. Specifically, the packet reconversion units 22-1 to 22-N reconvert the packet signal of the transmission frame structure according to the communication system of the corresponding transmission path 30-1 to 30-N into a bit string.

  The N (N-system) bit strings reconverted by the packet reconverting units 22-1 to 22-N are input to the video bit string synthesizing unit 23.

  The video bit string synthesis unit 23 receives N (N sequence) bit strings from the packet reconversion units 22-1 to 22-N, and the video bit string separation unit corresponding to the video signal transmission device 1-1 shown in FIG. The reverse process of 11 is performed. Specifically, the video bit string combining unit 23 combines N (N channels) bit strings according to a preset rule (a reverse rule to the rule used in the video bit string separation unit 11). The original video signal is generated and output to the outside. That is, the video bit string combining unit 23 is an upper (bit) bit corresponding to a high quality transmission line separated according to the quality of the transmission lines 30-1 to 30-N, which is N (N systems) bit strings. A bit string composed of data and a bit string that is lower-order bit data corresponding to a low-quality transmission path are combined to generate an original video signal.

  Here, if the video bit string synthesizing unit 23 determines that a bit error has occurred in the transmission lines 30-1 to 30-N and that the packet signal has been lost or the bit error has occurred in the packet signal, the lost bit data is stored. Complement using adjacent bit data received without error. The complementing process uses, for example, a method of linear complementation.

  When the video bit string combining unit 23 determines that the adjacent bit data is erroneous for a long period when complementing the lost bit data, the video bit string combining unit 23 determines that the complementing is difficult, and the like. Bit data is complemented (stuffed) with zero data. Here, loss of a packet signal can be determined based on the sequence number of the packet signal, and bit errors of the packet signal can be determined based on an error detection code (for example, a frame check sequence) of the packet signal. .

  For example, since lower bit data among a plurality of bit data constituting video data, which is a video signal, is transmitted through a transmission path of low quality, a bit error due to packet signal loss or packet signal bit error Is likely to occur. By the complementing process of the video bit string synthesizing unit 23, it is possible to make it difficult to visually detect a bit error of the video signal by a simple process.

  As described above, according to the video signal receiving apparatus 2-1 of the first embodiment, the transmission path decoding units 21-1 to 21-N receive the transmissions received via the corresponding transmission lines 30-1 to 30-N. The signal is subjected to transmission path decoding to generate a packet signal, and the packet reconversion units 22-1 to 22-N reconvert the corresponding packet signal into a bit string. Then, the video bit string combining unit 23 combines the N (N channels) bit strings according to a preset rule (a reverse rule to a predetermined rule used in the video bit string separation unit 11). Generate the original video signal.

  As a result, practical and economical video transmission can be realized using a part of inexpensive communication lines with a high bit error rate, without using a transmission line of an expensive band guarantee type high speed communication line. Furthermore, since it is not necessary to change the communication devices such as switches or routers existing in the middle of the transmission paths 30-1 to 30-N, the introduction of the video signal receiving device 2-1 becomes easy, and It can be cheaper. Further, the video signal receiving apparatus 2-1 itself can be simplified, and the operation efficiency at the program production site can be improved by reducing power consumption and space.

  That is, transmission of a large-capacity video signal can be realized at low cost without performing complicated signal processing, and adverse effects on image quality due to occurrence of errors can be suppressed.

Example 2
Next, Example 2 will be described. In the second embodiment, on the premise of a plurality of transmission paths having different qualities, a packet in which the upper bits of the video signal are stored is multiplexed and transmitted through the transmission path with higher quality, and the lower bits of the video signal are stored. This is an example in which packets are multiplexed and transmitted via a low quality transmission path. In the second embodiment, transmission is realized when the separation number N for separating a video signal into bit strings is not the same as the number of transmission lines (when the number of transmission lines is smaller than the separation number N), and flexible operation is possible. I assume.

(Video signal transmitter / Example 2)
The video signal transmission apparatus according to the second embodiment will be described in detail. FIG. 7 is a block diagram showing an example of the configuration of a video signal transmission apparatus according to the second embodiment. The video signal transmission device 1-2 includes a video bit string separation unit 11, N packet conversion units 12-1 to 12-N, one or more packet multiplexing units 14-1, and the like, and M transmission path encoding units. The units 13-1 to 13-M are provided. N is an integer of 2 or more, and M is an integer of 1 or more. N is greater than M.

  Comparing the video signal transmitting apparatus 1-1 according to the first embodiment shown in FIG. 1 and the video signal transmitting apparatus 1-2 according to the second embodiment shown in FIG. 7, both the video signal transmitting apparatuses 1-1 and 1-2 are compared. The video bit string separation unit 11 and the N packet conversion units 12-1 to 12-N are the same.

  On the other hand, the video signal transmission device 1-1 of the first embodiment does not include one or more packet multiplexing units 14-1 and the like, whereas the video signal transmission device 1-2 of the second embodiment has one or more. Is different in that the packet multiplexing unit 14-1 is provided. Further, while the video signal transmitting apparatus 1-1 according to the first embodiment includes N transmission path encoding units 13-1 to 13-N, the video signal transmitting apparatus 1-2 according to the second embodiment , M different from N in that the transmission path encoding units 13-1 to 13-M are provided.

  The video bit string separation unit 11 and the packet conversion units 12-1 to 12-N are the same as those in the first embodiment shown in FIG.

  The packet signals generated by the packet conversion units 12-1 and 12-2 are input to the packet multiplexing unit 14-1, and the packet signals generated by the packet conversion unit 12-N are transmission path encoding units 13-M. Is input. The packet signals generated by the packet conversion units 12-3 to 12- (N-1) are input to the corresponding packet multiplexing unit 14-2 or the like or the transmission path coding units 13-2 to 13- (M-1). Is done.

  The packet multiplexer 14-1 receives the packet signal from the packet converter 12-1, and also receives the packet signal from the packet converter 12-2, and multiplexes these packet signals. The packet signal multiplexed by the packet multiplexing unit 14-1 is input to the transmission path coding unit 13-1.

  The packet multiplexing unit 14-2 or the like inputs and multiplexes the packet signal from the corresponding packet conversion unit 12-3 or the like. The packet signal multiplexed by the packet multiplexing unit 14-2 or the like is input to the corresponding transmission line encoding unit 13-2 or the like.

  The transmission path coding unit 13-1 receives the multiplexed packet signal from the packet multiplexing unit 14-1 and performs transmission path coding on the packet signal. The transmission path encoding unit 13-M receives the packet signal from the packet conversion unit 12-N and encodes the packet signal.

  The transmission path coding units 13-2 to 13- (M-1) are packet signals or packets multiplexed from the corresponding packet multiplexing unit 14-2 or the like or the packet conversion units 12-3 to 12- (N-1). A signal is input, and the packet signal is channel-coded.

  That is, among the packet signals generated by the packet conversion units 12-1 to 12-N, the transmission path encoding units 13-1 to 13-M are a plurality of packet signals to be multiplexed by the packet multiplexing unit 14-1 and the like. For the packet signal except for the above and the packet signal (packet signal after multiplexing) multiplexed by the packet multiplexing unit 14-1 and the like, according to the communication system of the corresponding transmission line 30-1 to 30-M Do.

  Signals encoded on the transmission path by the transmission path encoding units 13-1 to 13-M are transmitted to the video signal receiving device 2-2 described later via the corresponding transmission paths 30-1 to 30-M as transmission signals. Sent.

  Although the packet multiplexing unit 14-1 receives and multiplexes two packet signals, it may multiplex and input three or more packet signals. That is, the packet multiplexing unit 14-1 or the like inputs and multiplexes two or more packet signals. 7 shows a configuration example in which the number M of the transmission lines 30-1 to 30-M is plural, M may be 1. In this case, the video signal transmission device 1-2 includes only the video bit string separation unit 11, the packet conversion unit 12-1, and the like, the packet multiplexing unit 14-1, and the transmission path encoding unit 13-1.

  As described above, according to the video signal transmission device 1-2 of the second embodiment, the video bit string separation unit 11 and the packet conversion units 12-1 to 12-N perform the same processing as that of the first embodiment. The packet multiplexing unit 14-1 or the like multiplexes a plurality of corresponding packet signals, and the transmission path encoding units 13-1 to 13-M perform transmission path encoding of the corresponding multiplexed packet signals or packet signals.

  As a result, the transmission path encoded signals are transmitted to the video signal receiving apparatus 2-2, which will be described later, via transmission paths 30-1 to 30-M having different qualities. Then, the video signal reception device 2-2 restores the original video signal by performing processing reverse to that of the video signal transmission device 1-2 on the channel-coded signal.

  Therefore, it is possible to achieve the same effect as in the first embodiment, to realize transmission of a large-capacity video signal at a low cost without performing complicated signal processing, and to suppress adverse effects on image quality due to occurrence of errors. Become. Further, it is possible to realize transmission of video signals through a number M of transmission lines 30-1 to 30-M smaller than the separation number N.

(Video signal receiver / Example 2)
Next, the video signal receiving apparatus according to the second embodiment will be described in detail. FIG. 8 is a block diagram showing an example of the configuration of a video signal receiving apparatus according to a second embodiment. The video signal receiving apparatus 2-2 includes N packet re-conversion units 22-1 to 22- such as M transmission path decoding units 21-1 to 21-M, one or more packet demultiplexing units 24-1, and the like. N, and an image bit string synthesis unit 23. N is an integer of 2 or more, and M is an integer of 1 or more. N is greater than M.

  Comparing the video signal receiving device 2-1 of the first embodiment shown in FIG. 6 with the video signal receiving device 2-2 of the second embodiment shown in FIG. , N packet re-conversion units 22-1 and video bit string synthesis unit 23 are identical.

  On the other hand, the video signal receiver 2-1 of the first embodiment includes N transmission path decoding units 21-1 to 21-N, whereas the video signal receiver 2-2 of the second embodiment The difference is that M transmission path decoding units 21-1 to 21-M smaller than N are provided. Further, the video signal receiving device 2-1 of the first embodiment does not include one or more packet separation units 24-1, and the like, whereas the video signal receiving device 2-2 of the second embodiment has one or more. Is different in that the packet separation unit 24-1 and the like are included.

  The video signal receiver 2-2 receives the transmission signal transmitted from the video signal transmitter 1-2 via the transmission paths 30-1 to 30-M, and the transmission path decoding units 21-1 to 21-M The transmission signals received from the corresponding transmission lines 30-1 to 30-M are input. Then, the transmission path decoding units 21-1 to 21-M perform processing reverse to that of the corresponding transmission path encoding units 13-1 to 13-M of the video signal transmission device 1-2 illustrated in FIG.

  The packet signal subjected to transmission line decoding by the transmission line decoding unit 21-1 is input to the packet separation unit 24-1, and the packet signal subjected to transmission line decoding by the transmission line decoding unit 21-M is transmitted to the packet reconversion unit 22-. N is input. The packet signal subjected to transmission line decoding by the transmission line decoding unit 21-2 to 21- (M-1) is transmitted to the corresponding packet separation unit 24-2 or the like or the packet reconversion unit 22-3 to 22- (N-1). Is input.

  The packet separator 24-1 performs the reverse process of the corresponding packet multiplexer 14-1 of the video signal transmitter 1-2 shown in FIG. Specifically, the packet separation unit 24-1 receives a packet signal (multiplexed packet signal) from the transmission path decoding unit 21-1 and separates two packet signals from the multiplexed packet signal. One of the packet signals separated by the packet separation unit 24-1 is input to the packet reconversion unit 22-1, and the other is input to the packet reconversion unit 22-2.

  The packet separation unit 24-2 and the like perform the reverse process of the corresponding packet multiplexing unit 14-2 and the like of the video signal transmission device 1-2 illustrated in FIG. Specifically, the packet separation unit 24-2 or the like receives the packet signal (multiplexed packet signal) from the corresponding transmission path decoding unit 21-2 or the like, and transmits a predetermined number of packet signals from the multiplexed packet signal. To separate. The packet signal separated by the packet separation unit 24-2 and the like is input to the packet reconversion unit 22-3 and the like.

  The packet reconversion unit 22-1 receives the packet signal from the packet separation unit 24-1, and the packet reconversion unit 22-2 receives the packet signal from the packet separation unit 24-2, and the video shown in FIG. The inverse processing of the corresponding packet conversion units 12-1 and 12-2 of the signal transmission device 1-2 is performed. The packet re-conversion unit 22-N receives the packet signal from the corresponding transmission path decoding unit 21-M and performs the reverse process of the corresponding packet conversion unit 12-N.

  The packet re-conversion units 22-3 to 22- (N-1) input packet signals from the corresponding packet separation unit 24-2 or the like or the transmission path decoding units 21-2 to 21- (M-1), The reverse processing of the packet converting units 12-3 to 12- (N-1) is performed.

  That is, among the packet signals generated by the transmission path decoding units 21-1 to 21-M, the packet reconversion units 22-1 to 22-N are packet signals not to be separated by the packet separation unit 24-1 or the like ( The packet signal not input to the packet separator 24-1 and the like and the packet signal separated by the packet separator 24-1 and the like are reconverted into a bit string.

  The video bit string synthesizing unit 23 is the same as that of the first embodiment shown in FIG.

  Although FIG. 8 shows a configuration example in which the number M of the transmission lines 30-1 to 30-M is plural, M may be 1. In this case, the video signal receiving apparatus 2-2 includes only the transmission path decoding unit 21-1, the packet separation unit 24-1, the packet reconversion unit 22-1, and the like, and the video bit string combining unit 23.

  As described above, according to the video signal receiving apparatus 2-2 of the second embodiment, the transmission path decoding units 21-1 to 21-M receive the transmissions received via the corresponding transmission paths 30-1 to 30-M. The signal is subjected to transmission path decoding to generate a packet signal, and the packet separation unit 24-1 and the like separate a predetermined number of packet signals from the multiplexed packet signal, and the packet reconversion units 22-1 to 22-N and the video The bit string synthesis unit 23 performs the same processing as in the first embodiment.

  As a result, the same effects as in the first embodiment can be achieved, transmission of a large-capacity video signal can be realized at low cost without performing complicated signal processing, and adverse effects on image quality due to occurrence of errors can be suppressed. It becomes. Further, it is possible to realize transmission of video signals through a number M of transmission lines 30-1 to 30-M smaller than the separation number N.

[Example 3]
Next, Example 3 will be described. In the third embodiment, on the premise of a plurality of transmission paths having substantially the same quality, a packet in which the upper bits of the video signal are stored is error correction encoded with a code of high correction performance and transmitted, and the lower bits are stored. This is an example in which the packet is transmitted by error correction coding with a code of low correction performance. The first and second embodiments can not be applied to a plurality of transmission paths having substantially the same quality. Therefore, in the third embodiment, by adding a plurality of different error correction functions to the configuration of the first embodiment, application to such a transmission path is enabled.

(Video signal transmitter / Example 3)
The video signal transmission apparatus of the third embodiment will be described in detail. FIG. 9 is a block diagram showing an example of the configuration of a video signal transmission apparatus according to a third embodiment. The video signal transmitter 1-3 includes a video bit string separation unit 11, N packet conversion units 12-1 to 12-N, N error correction coding units 15-1 to 15-N, and N Transmission path coding units 13-1 to 13-N are provided. N is an integer of 2 or more.

  The video signal transmission device 1-3 separates the video signal to be transmitted into N video signals and performs error correction coding. The video signal separated into N pieces and error correction coded is transmitted from the video signal transmitter 1-3 to the video signal receiver 2-3 described later via the transmission paths 30-1 to 30-N. It is assumed that the quality of the transmission lines 30-1 to 30-N is substantially equal. That is, the error rates of the packet signals transmitted in the transmission paths 30-1 to 30-N take values within a predetermined range and are substantially the same. The same applies to transmission lines 30-1 to 30-M of Example 4 to be described later.

  Comparing the video signal transmitting apparatus 1-1 according to the first embodiment shown in FIG. 1 and the video signal transmitting apparatus 1-3 according to the third embodiment shown in FIG. 9, both the video signal transmitting apparatuses 1-1 and 1-3 are obtained. The video bit string separation unit 11, the N packet conversion units 12-1 to 12-N, and the N transmission line encoding units 13-1 to 13-N are the same.

  On the other hand, while the video signal transmitting apparatus 1-1 according to the first embodiment does not include the N error correction coding units 15-1 to 15-N, the video signal transmitting apparatus 1-3 according to the third embodiment And N error correction coding units 15-1 to 15-N. In addition, the video bit string separation unit 11 of the video signal transmission device 1-1 according to the first embodiment performs the separation process according to a rule according to the quality of the transmission lines 30-1 to 30-N, whereas the video bit stream according to the third embodiment. The video bit string separation unit 11 of the signal transmission device 1-3 is different in that separation processing is performed according to a rule according to the correction performance of the error correction coding units 15-1 to 15-N. The transmission paths 30-1 to 30-N of the first embodiment are different in quality, whereas the transmission paths 30-1 to 30-N of the third embodiment are different in that the quality is almost equal.

  The video bit string separation unit 11 inputs a video signal to be transmitted, and converts a plurality of bit data constituting the video data, which is a video signal, into error correction encoding units 15-1 to 15-N according to a preset rule. Corresponding to the error correction coding unit using the high correction performance code and the lower bit data corresponding to the low correction performance code. N (N systems) bit strings are generated so as to correspond. The separation number N is a number corresponding to the transmission lines 30-1 to 30-N.

  The N series of bit strings generated by the video bit string separation unit 11 are input to the corresponding packet conversion units 12-1 to 12-N.

  For example, as a preset rule, a plurality of bit data (a series of bit data from the upper bits to the lower bits) constituting video data which is a video signal, the error correction coding unit 15-1 N groups are equally divided into N groups (groups for the number of transmission lines 30-1 to 30-N) corresponding to the error correction coding units 15-1 to 15-N according to the correction performance of 15-N. Rules for generating bit strings of are defined.

  The error correction coding unit 15-1 has the highest correction performance, and the correction performance decreases in order from the error correction coding unit 15-1 to the error correction coding unit 15-N. When N has the lowest correction performance, the bit string corresponding to the error correction coding unit 15-1 is generated so as to be composed of upper bit data in the video data, and corresponds to the error correction coding unit 15-N. The bit string is generated so as to be composed of lower-order bit data. That is, as the correction performance of the error correction coding units 15-1 to 15-N is higher, a bit string composed of higher order bit data in the video data is generated, and as the correction performance is lower, a bit string composed of lower order bit data Is generated.

  Further, for example, as a preset rule, a plurality of bit data (a series of bit data from upper bits to lower bits) constituting video data which is a video signal is converted into an error correction encoding unit 15- Depending on the correction performance of 1 to 15-N, N groups (groups for the number of transmission lines 30-1 to 30-N) corresponding to the error correction coding units 15-1 to 15-N, and the transmission lines Rules are defined for generating N bit strings by separating the bit lengths in proportion to the transmission rates of 30-1 to 30-N.

  The error correction coding unit 15-1 has the highest correction performance, and the correction performance decreases in order from the error correction coding unit 15-1 to the error correction coding unit 15-N. N has the lowest correction performance, and transmission line 30-1 has the highest speed, and the speed from transmission line 30-1 to transmission line 30-N sequentially decreases in speed, and transmission line 30-N has the most. Assume a low speed. In this case, the bit string corresponding to the error correction encoding unit 15-1 (the bit string corresponding to the transmission line 30-1) is composed of higher-order bit data in the video data and is generated so as to have a long bit length. The bit string (bit string corresponding to the transmission path 30-N) corresponding to the correction encoding unit 15-N is composed of lower-order bit data and is generated so as to have a short bit length. That is, as the correction performance of the error correction coding units 15-1 to 15-N is higher, a bit string composed of higher order bit data in the video data is generated, and as the correction performance is lower, a bit string composed of lower order bit data Is generated. A bit string having a longer bit length is generated as the transmission speed of the transmission paths 30-1 to 30-N is higher, and a bit string having a shorter bit length is generated as the transmission speed is lower.

  By using this rule, the upper bit data having a large influence on the video is allocated to the transmission path of the video signal on which the error correction coding processing with high correction performance is performed, and the high speed transmission path is Since a lot of bit data is allocated, the video signal can be transmitted efficiently.

  For example, as a preset rule, as in the first embodiment, a plurality of bit data (a series of bit data from upper bits to lower bits) constituting video data which is a video signal are A rule is defined that generates a bit string of N systems by separating into a predetermined bit length for each of the error correction coding units 15-1 to 15-N (transmission paths 30-1 to 30-N). In this case, it may be separated into N bit strings having different bit lengths.

  By using this rule, the operator can freely set the bit length for each system (every transmission line 30-1 to 30-N) of the error correction coding process, so the video signal with high degree of freedom Can be realized.

  The N packet conversion units 12-1 to 12-N and the transmission path coding units 13-1 to 13-N are the same as in the first embodiment shown in FIG.

  The error correction coding units 15-1 to 15-N receive the packet signals from the corresponding packet conversion units 12-1 to 12-N, and generate a code with high correction performance with respect to the packet signal including bit data on the upper side. Then, error correction coding is performed, and error correction coding is performed on a packet signal including lower-order bit data with a code having low correction performance.

  The packet signals subjected to error correction coding by the error correction coding units 15-1 to 15-N are input to the corresponding transmission path coding units 13-1 to 13-N.

  For example, the packet signal input from the packet conversion unit 12-1 includes the most significant bit data, and the packet conversion unit 12-1 to the packet conversion unit 12-N include many lower order bit data in order. Assume that the packet signal input from the packet conversion unit 12-N includes the least significant bit data. In this case, the error correction coding unit 15-1 performs the error correction coding process with the code with the highest correction performance, and the error correction coding unit 15-N performs the error correction code with the code with the lowest correction performance. Process. That is, as the packet signal includes higher order bit data, error correction coding processing with higher correction performance is performed, and as the lower order bit data is included, error correction coding processing with lower correction capability is performed.

  The error correction coding units 15-1 to 15-N have high correction performance with respect to packet signals including bit data on the upper side, and have low correction performance with respect to packet signals including bit data on the lower side. The error correction coding method is preset. Assuming that the degree of redundancy of the error correction coding is the same, for example, an LDPC code is used as a method of error correction coding with high correction performance, and, for example, a BCH code is used as a method of error correction coding with low correction performance.

  Note that the correction performance of the error correction coding may be different in all the systems so that the correction performance of the error correction coding is higher for the upper bit data and lower for the lower bit data, or only a part of it. It may be different.

  In FIG. 9, the video signal transmitting apparatus 1-3 includes the error correction coding units 15-1 to 15-N, the packet conversion units 12-1 to 12-N, and the transmission path coding units 13-1 to 13-N. However, it may be provided between the video bit string separation unit 11 and the packet conversion units 12-1 to 12-N.

  As described above, according to the video signal transmitting apparatus 1-3 of the third embodiment, the video bit string separation unit 11 errors the plurality of bit data forming the video data which is a video signal according to a preset rule. It is separated according to the correction performance of the correction coding units 15-1 to 15-N, and the upper bit data corresponds to the error correction coding unit with high correction performance, and the lower bit data is an error with low correction performance. N (N channels) bit strings are generated to correspond to the correction encoding unit. Then, the packet conversion units 12-1 to 12-N convert the corresponding bit string into a packet signal, and the error correction coding units 15-1 to 15-N are higher than the packet signal including higher-order bit data Error correction coding is performed using a correction performance code, and a packet signal including lower-order bit data is subjected to error correction coding using a low correction performance code. Then, the transmission path coding units 13-1 to 13-N perform transmission path coding on the corresponding packet signals.

  Thus, the transmission line coded signals are transmitted to the video signal reception apparatus 2-3 described later via the transmission lines 30-1 to 30-N of substantially the same quality. Then, the video signal reception device 2-3 restores the original video signal by performing processing reverse to that of the video signal transmission device 1-3 on the channel-coded signal.

  Therefore, it is possible to achieve the same effect as in the first embodiment, to realize transmission of a large-capacity video signal at a low cost without performing complicated signal processing, and to suppress adverse effects on image quality due to occurrence of errors. Become. In addition, since a code with low correction performance is also used in the error correction coding units 15-1 to 15-N, the circuit scale of the LSI that performs the error correction coding process can be reduced, and the size reduction associated therewith In addition, low power consumption can be realized, and transmission efficiency can be improved by reducing the number of corrected parity bits.

(Video signal receiving apparatus / Example 3)
Next, the video signal receiving apparatus according to the third embodiment will be described in detail. FIG. 10 is a block diagram showing an example of the configuration of a video signal receiving apparatus according to the third embodiment. The video signal receiving apparatus 2-3 includes N transmission line decoding units 21-1 to 21-N, N error correction decoding units 25-1 to 25-N, and N packet reconversion units 22-1. To 22-N and a video bit string synthesis unit 23. N is an integer of 2 or more.

  When comparing the video signal receiving device 2-1 of the first embodiment shown in FIG. 6 with the video signal receiving device 2-3 of the third embodiment shown in FIG. , N transmission path decoding units 21-1 to 21 -N, N packet re-conversion units 22-1 to 22 -N, and video bit string synthesizing unit 23.

  On the other hand, while the video signal receiving apparatus 2-1 of the first embodiment does not include the N error correction decoding units 25-1 to 25-N, the video signal receiving apparatus 2-3 of the third embodiment The difference is that N error correction decoders 25-1 to 25-N are provided. Further, the video bit string combining unit 23 of the video signal receiving apparatus 2-1 in the first embodiment performs the combining process according to the rule according to the quality of the transmission paths 30-1 to 30-N, while the video in the third embodiment The video bit string synthesizing unit 23 of the signal receiving device 2-3 follows a rule according to the correction performance of the error correction decoding units 25-1 to 25-N (correction performance of the error correction coding units 15-1 to 15-N). The difference is that the synthesis process is performed. Further, the transmission paths 30-1 to 30-N of the first embodiment are different in quality, whereas the transmission paths 30-1 to 30-N of the third embodiment are different in that the quality is substantially the same.

  The video signal receiving device 2-3 receives the transmission signal transmitted from the video signal transmitting device 1-3 via the transmission paths 30-1 to 30-N. The transmission path decoding units 21-1 to 21-N are the same as the first embodiment shown in FIG.

  The error correction decoding units 25-1 to 25-N perform the reverse processing of the corresponding error correction coding units 15-1 to 15-N of the video signal transmission device 1-3 shown in FIG. Specifically, the error correction decoding units 25-1 to 25-N perform error correction decoding on a packet signal including higher-order bit data with a code having high correction performance, and a packet signal including lower-order bit data. On the other hand, error correction decoding is performed with a code having low correction performance.

  The packet signals error-corrected and decoded by the error correction decoders 25-1 to 25-N are input to the corresponding packet reconversion units 22-1 to 22-N. The packet reconversion units 22-1 to 22-N are the same as the first embodiment shown in FIG.

  The video bit string synthesizing unit 23 receives N (N series) bit strings from the packet re-conversion units 22-1 to 22-N, and the corresponding video bit string separating unit of the video signal transmission device 1-3 illustrated in FIG. The reverse process of 11 is performed. Specifically, the video bit string synthesizing unit 23 synthesizes N (N systems) bit strings in accordance with a preset rule (a rule reverse to the rule used in the video bit string separation unit 11). The original video signal is generated and output to the outside. That is, the video bit string combining unit 23 is a bit string of N (N channels), and the correction performance of the error correction decoding units 25-1 to 25-N (the correction performance of the error correction coding units 15-1 to 15-N) ) Are bit strings that are higher-order bit data corresponding to an error correction decoding unit with higher correction performance and lower-order bit data corresponding to an error correction decoding unit with lower correction performance. The bit sequence is synthesized to generate an original video signal.

  Here, as in the first embodiment, the video bit string synthesis unit 23 determines that a bit error has occurred in the transmission lines 30-1 to 30-N and a packet signal has been lost or a bit error has occurred in the packet signal. And complement the bit data that has been lost or the like using the adjacent bit data received without error.

  In FIG. 10, the video signal receiving apparatus 2-3 includes the error correction decoding units 25-1 to 25-N, the transmission line decoding units 21-1 to 21-N, and the packet reconversion units 22-1 to 22-. However, it may be provided between the packet re-conversion units 22-1 to 22-N and the video bit string synthesizing unit 23.

  As described above, according to the video signal receiving apparatus 2-3 of the third embodiment, the transmission path decoding units 21-1 to 21-N receive the transmissions received via the corresponding transmission paths 30-1 to 30-N. The packet is generated by decoding the signal through a transmission path. Then, the error correction decoding units 25-1 to 25-N perform error correction decoding on a packet signal including higher-order bit data with a code with high correction performance, and are lower than a packet signal including lower-order bit data. Error correction decoding is performed using a code of correction performance. Then, the packet re-conversion units 22-1 to 22-N re-convert the corresponding packet signal into a bit string, and the video bit string synthesizing unit 23 sets a predetermined rule (the video bit string separation unit 11 shown in FIG. 9). The original video signal is generated by combining N (N channels) bit strings according to the reverse rule to the rule used.

  As a result, the same effects as in the first embodiment can be achieved, transmission of a large-capacity video signal can be realized at low cost without performing complicated signal processing, and adverse effects on image quality due to occurrence of errors can be suppressed. It becomes. In addition, since the error correction decoding units 25-1 to 25-N also use codes with low correction performance, the circuit scale of the LSI that performs error correction decoding processing can be reduced, and the downsizing and reduction associated therewith. Power consumption can be realized, and transmission efficiency can be improved by reducing the number of correction parity bits.

Example 4
Next, Example 4 will be described. The fourth embodiment is based on the premise of a plurality of transmission paths having substantially the same quality, multiplexes packets storing the upper bits of the video signal, performs error correction encoding with a high correction performance code, and transmits the lower bits. In this example, the stored packets are multiplexed, error-corrected with a low correction performance code, and transmitted. The first and second embodiments cannot be applied to a plurality of transmission lines having substantially the same quality. Therefore, in the fourth embodiment, by adding a plurality of different error correction functions to the configuration of the second embodiment, application to such a transmission path is enabled. Further, in the fourth embodiment, transmission is realized when the number of separations N for separating a video signal into bit strings and the number of transmission lines are not the same (when the number of transmission lines is smaller than the number of separations N), and flexible operation Is possible.

(Video signal transmitter / Example 4)
The video signal transmission apparatus of the fourth embodiment will be described in detail. FIG. 11 is a block diagram showing an example of the configuration of a video signal transmission apparatus according to a fourth embodiment. The video signal transmitter 1-4 includes a video bit string separation unit 11, N packet conversion units 12-1 to 12-N, N error correction coding units 15-1 to 15-N, and one or more A packet multiplexing unit 14-1 and the like, and M transmission path coding units 13-1 to 13-M are provided. N is an integer of 2 or more, and M is an integer of 1 or more. N is greater than M.

  When the video signal transmitter 1-3 of the third embodiment shown in FIG. 9 is compared with the video signal transmitter 1-4 of the fourth embodiment shown in FIG. 11, both video signal transmitters 1-3 and 1-4 It is identical in that the video bit string separation unit 11, N packet conversion units 12-1 to 12-N, and N error correction coding units 15-1 are provided. On the other hand, while the video signal transmitting apparatus 1-3 of the third embodiment does not include one or more packet multiplexing units 14-1 and the like, the video signal transmitting apparatus 1-4 of the fourth embodiment includes one or more. Is different in that the packet multiplexing unit 14-1 and the like are included. The video signal transmitting apparatus 1-3 of the third embodiment includes N transmission path coding units 13-1 to 13-N, whereas the video signal transmitting apparatus 1-4 of the fourth embodiment has , M different from N in that the transmission path encoding units 13-1 to 13-M are provided.

  The video bit string separation unit 11, the packet conversion units 12-1 to 12-N, and the error correction coding units 15-1 to 15-N are the same as those in the third embodiment shown in FIG. To do.

  The packet signals generated by the error correction encoding units 15-1 and 15-2 are input to the packet multiplexing unit 14-1, and the packet signal generated by the error correction encoding unit 15-N is channel-coded. Input to the unit 13-M. The packet signals generated by the error correction coding units 15-3 to 15- (N-1) correspond to the packet multiplexing unit 14-2 or the like or the transmission line coding units 13-2 to 13- (M-1). Is input.

  The packet multiplexing unit 14-1 receives a packet signal from the error correction coding unit 15-1, and receives a packet signal from the error correction coding unit 15-2, and multiplexes these packet signals. The packet signal multiplexed by the packet multiplexing unit 14-1 is input to the transmission path coding unit 13-1.

  The packet multiplexing unit 14-2 and the like receive and multiplex the packet signal from the corresponding error correction coding unit 15-3 and the like. The packet signal multiplexed by the packet multiplexing unit 14-2 or the like is input to the corresponding transmission line encoding unit 13-2 or the like.

  The transmission path coding unit 13-1 receives the multiplexed packet signal from the packet multiplexing unit 14-1 and performs transmission path coding on the packet signal. The transmission path coding unit 13-M receives the packet signal from the error correction coding unit 15-N, and performs transmission path coding on the packet signal.

  Transmission path coding units 13-2 to 13- (M-1) are packet signals multiplexed from corresponding packet multiplexing unit 14-2 or the like or error correction coding units 15-3 to 12- (N-1). Alternatively, the packet signal is input, and the packet signal is channel-coded.

  That is, among the packet signals generated by the error correction coding units 15-1 to 15-N, the transmission path coding units 13-1 to 13-M include a plurality of multiplexing targets by the packet multiplexing unit 14-1 and the like. Transmission according to the communication system of the corresponding transmission path 30-1 to 30-M to the packet signal excluding the packet signal and the packet signal (packet signal after multiplexing) multiplexed by the packet multiplexing unit 14-1 and the like Perform path coding.

  Signals encoded on the transmission line by the transmission line encoding units 13-1 to 13-M are transmitted to the video signal receiving apparatus 2-4 described later via the corresponding transmission lines 30-1 to 30-M as transmission signals. Sent.

  Although the packet multiplexing unit 14-1 receives and multiplexes two packet signals, it may multiplex and input three or more packet signals. That is, the packet multiplexing unit 14-1 or the like inputs and multiplexes two or more packet signals. Further, although FIG. 11 shows a configuration example in which the number M of the transmission paths 30-1 to 30-M is plural, M may be one. In this case, the video signal transmission device 1-4 includes the video bit string separation unit 11, the packet conversion unit 12-1, etc., the error correction coding unit 15-1, etc., the packet multiplexing unit 14-1, and the transmission path coding unit 13-. 1 only.

  Further, in FIG. 11, the video signal transmitting apparatus 1-4 includes the error correction coding units 15-1 to 15-N, the packet conversion units 12-1 to 12-N, the packet multiplexing unit 14-1, and the like, and a transmission path. Although provided between the encoding units 13-1 to 13-M, it may be provided between the video bit string separation unit 11 and the packet conversion units 12-1 to 12-N.

  As described above, according to the video signal transmitting apparatus 1-4 of the fourth embodiment, the video bit string separation unit 11, the packet conversion units 12-1 to 12-N, and the error correction coding units 15-1 to 15-N The same processing as in the third embodiment is performed. The packet multiplexing units 14-1 and the like multiplex corresponding multiple packet signals as in the second embodiment, and the transmission path coding units 13-1 to 13-M perform corresponding multiplexing as in the second embodiment. The encoded packet signal or packet signal is subjected to transmission line encoding.

  Thus, the transmission line coded signals are transmitted to the video signal receiving apparatus 2-4 described later via the transmission lines 30-1 to 30-M with almost the same quality. Then, the video signal receiving apparatus 2-4 restores the original video signal by performing processing reverse to that of the video signal transmitting apparatus 1-4 on the channel-coded signal.

  Therefore, it is possible to achieve the same effect as in the first embodiment, to realize transmission of a large-capacity video signal at a low cost without performing complicated signal processing, and to suppress adverse effects on image quality due to occurrence of errors. Become. Further, as in the second embodiment, transmission of video signals by the number M of transmission paths 30-1 to 30-M smaller than the separation number N can be realized. Further, as in the third embodiment, since the code of low correction performance is also used in the error correction coding units 15-1 to 15-N, the circuit scale of the LSI that performs the error correction coding process is reduced. Thus, the reduction in size and power consumption can be realized, and the transmission efficiency can be improved by reducing the number of correction parity bits.

(Video signal receiver / Example 4)
Next, the video signal receiving apparatus according to the fourth embodiment will be described in detail. FIG. 12 is a block diagram illustrating a configuration example of the video signal receiving apparatus according to the fourth embodiment. The video signal receiving apparatus 2-4 includes N error correction decoding units 25-1 to 25- such as M transmission path decoding units 21-1 to 21-M, one or more packet separation units 24-1, and the like. N, N packet re-conversion units 22-1 to 22-N, and a video bit string combining unit 23 are provided. N is an integer of 2 or more, and M is an integer of 1 or more. N is greater than M.

  Comparing the video signal receiving apparatus 2-3 of the third embodiment shown in FIG. 10 with the video signal receiving apparatus 2-4 of the fourth embodiment shown in FIG. 12, both video signal receiving apparatuses 2-3 and 2-4 It is identical in that it includes N error correction decoding units 25-1 to 25-N, N packet reconversion units 22-1 to 22-N, and a video bit string synthesis unit 23.

  On the other hand, the video signal receiving apparatus 2-3 of the third embodiment includes N transmission path decoding units 21-1 to 21-N, whereas the video signal receiving apparatus 2-4 of the fourth embodiment The difference is that M transmission path decoding units 21-1 to 21-M smaller than N are provided. Also, while the video signal receiving apparatus 2-3 of the third embodiment does not include one or more packet separation units 24-1 and the like, the video signal receiving apparatus 2-4 of the fourth embodiment includes one or more. Is different in that the packet separation unit 24-1 and the like are included.

  The video signal receiving apparatus 2-4 receives the transmission signal transmitted from the video signal transmitting apparatus 1-4 shown in FIG. 11 via the transmission paths 30-1 to 30-M. The transmission path decoding units 21-1 to 21-M receive the transmission signals received from the corresponding transmission paths 30-1 to 30-M. The transmission path decoding units 21-1 to 21-M, the packet separation unit 24-1, and the like are the same as those of the second embodiment illustrated in FIG. 8, and thus the description thereof is omitted here.

  The error correction decoding units 25-1 to 25-N, the packet reconversion units 22-1 to 22-N, and the video bit string synthesizing unit 23 are the same as those of the third embodiment shown in FIG. To do.

  Here, the packet signal decoded by the transmission path decoding unit 21-1 is input to the packet separation unit 24-1, and the packet signal decoded by the transmission path decoding unit 21-M is subjected to error correction decoding. Input to section 25-N. The packet signal subjected to transmission line decoding by the transmission line decoding units 21-2 to 21- (M-1) is transmitted to the corresponding packet separation unit 24-2 or the like or the error correction decoding unit 25-3 to 25- (N-1). Is input.

  One of the packet signals separated by the packet separation unit 24-1 is input to the error correction decoding unit 25-1, and the other is input to the error correction decoding unit 25-2. The packet signal separated by the packet separation unit 24-2 or the like is input to the corresponding error correction decoding unit 25-3 or the like.

  Among the packet signals generated by the transmission path decoding units 21-1 to 21-M, the error correction decoding units 25-1 to 25-N are packet signals not to be separated by the packet separation unit 24-1 or the like (packet separation unit A packet signal not input to 24-1 and the like) and a packet signal separated by the packet separation unit 24-1 and the like are input. Then, the error correction decoding units 25-1 to 25-N perform error correction decoding on a packet signal including higher-order bit data with a code with high correction performance, and are lower than a packet signal including lower-order bit data. Error correction decoding is performed using a code of correction performance.

  Although FIG. 12 shows a configuration example in which the number M of transmission paths 30-1 to 30-M is plural, M may be one. In this case, the video signal receiving apparatus 2-4 includes the transmission path decoding unit 21-1, the packet separation unit 24-1, the error correction decoding unit 25-1, the packet reconversion unit 22-1 and the like, and the video bit string combining unit 23. With only.

  In FIG. 12, the video signal receiving apparatus 2-4 includes error correction decoding units 25-1 to 25-N, transmission path decoding units 21-1 to 21-N, a packet separation unit 24-1, and the like, and a packet reconversion unit. Although provided between 22-1 to 22-N, it may be provided between the packet re-conversion units 22-1 to 22-N and the video bit string synthesis unit 23.

  As described above, according to the video signal receiving device 2-4 of the fourth embodiment, the transmission path decoding units 21-1 to 21-M receive the transmissions received through the corresponding transmission paths 30-1 to 30-M. The signal is transmission path decoded to generate a packet signal, and the packet separator 24-1 and the like separate the multiplexed packet signal into a predetermined number of packet signals. Then, the error correction decoding units 25-1 to 25-N perform error correction decoding on a packet signal including higher-order bit data with a code with high correction performance, and are lower than a packet signal including lower-order bit data. Error correction decoding is performed using a code of correction performance. Then, the packet reconversion units 22-1 to 22-N and the video bit string combining unit 23 perform the same process as that of the third embodiment.

  As a result, the same effects as in the first embodiment can be achieved, transmission of a large-capacity video signal can be realized at low cost without performing complicated signal processing, and adverse effects on image quality due to occurrence of errors can be suppressed. It becomes. Similarly to the second embodiment, it is possible to realize transmission of video signals through a number M of transmission lines 30-1 to 30-M smaller than the separation number N. Further, as in the third embodiment, the code of low correction performance is also used in the error correction decoding units 25-1 to 25-N, so that the circuit scale of the LSI performing the error correction decoding process can be reduced. As a result, downsizing and low power consumption can be realized, and transmission efficiency can be improved by reducing the number of corrected parity bits.

  Although the present invention has been described with reference to the first to fourth embodiments, the present invention is not limited to the first to fourth embodiments, and various modifications can be made without departing from the technical idea thereof. For example, in the first to fourth embodiments, the video bit string separation unit 11 of the video signal transmission apparatuses 1-1 to 1-4 performs the video signal separation processing according to a preset rule. It is also possible to input priority setting information, change a preset rule, and perform video signal separation processing according to the changed rule. For example, the operator determines the quality of the video signal output by the video signal receiving devices 2-1 to 2-4. Then, the video bit string separation unit 11 of the video signal transmission devices 1-1 to 1-4 inputs the priority setting information in which the quality is reflected by the operation of the operator. In this case, the video signal transmitting devices 1-1 to 1-4 transmit the rule changed according to the input priority setting information to the video signal receiving devices 2-1 to 2-4, and the video signal receiving device 2-1. The video bit string combining unit 23 of 2 to 4 performs combining processing in accordance with the reverse rule of the changed rule.

  The video signal transmitting apparatus and the video signal receiving apparatus according to the present invention are used for a wide range of broadcasting business equipment in transmission within a broadcasting station or between broadcasting stations, and are particularly useful for downsizing and cost reduction of a transmission system.

DESCRIPTION OF SYMBOLS 1 video signal transmitter 2 video signal receiver 11 video bit string separation part 12 packet conversion part 13 transmission path coding part 14 packet multiplexing part 15 error correction coding part 21 transmission path decoding part 22 packet re-conversion part 23 video bit string synthesis part 24 packet separation unit 25 error correction decoding unit 30 transmission path

Claims (4)

In a video signal transmitting apparatus for transmitting a video signal through M (M is an integer of 1 or more) transmission paths having different error rates,
Of the plurality of bit data constituting the video signal, upper order bit data is defined to correspond to the transmission line having a low error rate, and lower order bit data is defined to correspond to the transmission line having a high error rate. A video bit string separating unit that separates a plurality of bit data constituting the video signal and generates N (N is an integer of 2 or more larger than M) bit strings;
A packet conversion unit that converts the N bit strings generated by the video bit string separation unit into N packet signals according to the communication system of the corresponding transmission path;
A packet multiplexing unit for multiplexing a plurality of packet signals to be multiplexed among the N packet signals converted by the packet conversion unit;
Among the N packet signals converted by the packet conversion unit, packet signals other than the plurality of packet signals to be multiplexed and packet signals multiplexed by the packet multiplexing unit A channel coding unit that performs channel coding according to the communication method;
A video signal transmitting apparatus, wherein the M transmission signals subjected to the channel coding are transmitted through the corresponding transmission channel. In a video signal transmitting apparatus for transmitting a video signal through M (M is an integer of 1 or more) transmission paths having an equal error rate,
Among the plurality of bit data constituting the video signal, the upper bit data corresponds to an error correction coding process using a code with high correction performance, and the lower bit data is error correction using a code with low correction performance A plurality of bit data constituting the video signal are separated according to a rule defined to correspond to the encoding process, and N (where N is an integer of 2 or more larger than M) corresponding to the error correction encoding process A video bit string separation unit that generates a bit string of
A packet conversion unit that converts the N bit strings generated by the video bit string separation unit into N packet signals according to the communication system of the corresponding transmission path;
Of the N packet signals converted by the packet converter, the packet signal including the bit data on the upper side is subjected to error correction coding processing using a code with high correction performance, and the bits on the lower side are processed. An error correction coding unit that performs error correction coding processing on a packet signal containing data using a code with low correction performance;
A packet multiplexing unit that multiplexes a plurality of packet signals to be multiplexed among the N packet signals that have been subjected to error correction coding processing by the error correction coding unit;
Among the N packet signals subjected to error correction coding processing by the error correction coding unit, packet signals other than the plurality of packet signals to be multiplexed and the packet signals multiplexed by the packet multiplexing unit A channel coding unit that performs channel coding according to the corresponding communication system of the channel,
A video signal transmitting apparatus, wherein the M transmission signals subjected to the channel coding are transmitted through the corresponding transmission channel. In the video signal receiving apparatus for receiving M transmission signals transmitted from the video signal transmitting apparatus according to claim 1 through M transmission paths (M is an integer of 1 or more) having different error rates,
A transmission path decoding unit that performs transmission path decoding on the M transmission signals according to the communication system of the corresponding transmission path to generate M packet signals;
A packet separation unit for separating a plurality of original packet signals from multiplexed packet signals of the M packet signals generated by the transmission path decoding unit;
Of the M packet signals generated by the transmission path decoding unit, N packet signals that are not subject to separation by the packet separation unit and packet signals separated by the packet separation unit (N is from M) A packet reconversion unit that reconverts into a larger (more than 2 integer) bit string,
Of the plurality of bit data constituting the video signal, the upper bit data is defined to correspond to the transmission path having a low error rate, and the lower bit data is defined to correspond to the transmission path having a high error rate. A video signal receiving apparatus comprising: a video bit string synthesizing unit that synthesizes the N bit strings re-converted by the packet re-conversion unit according to a rule opposite to the rule, and generates the video signal. . In the video signal receiving apparatus for receiving M transmission signals transmitted from the video signal transmitting apparatus according to claim 2 through M transmission paths (M is an integer of 1 or more) having different error rates,
A transmission path decoding unit that performs transmission path decoding on the M transmission signals according to the communication system of the corresponding transmission path to generate M packet signals;
A packet separation unit for separating a plurality of original packet signals from multiplexed packet signals of the M packet signals generated by the transmission path decoding unit;
Among the M packet signals generated by the transmission path decoding unit, packet signals not to be separated by the packet separation unit and packet signals separated by the packet separation unit include upper bit data An error correction decoding unit that performs error correction decoding processing on a packet signal with a code with high correction performance and performs error correction decoding processing on a packet signal including lower bit data with a code with low correction performance;
A packet re-conversion unit for re-converting N (N is an integer greater than M and an integer of 2 or more) packet signals subjected to error correction decoding processing by the error correction decoding unit into N bit strings;
An error correction code using an error correction coding process in which lower order bit data corresponds to an error correction coding process using a code with high correction performance among higher bit data among a plurality of bit data constituting a video signal And a video bit string combining unit that combines the N bit strings reconverted by the packet reconversion unit according to a reverse rule of a rule defined to correspond to the video processing and generates the video signal. A video signal receiving apparatus characterized by

Images