JP2001061144A - Transmission system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve efficiency of a transmission system at communication time. SOLUTION: A compression system discriminating processing section 11 of this transmission system classifies input data into a compressed data group 30 on the basis of an input 52 by an application and reception environment information 53, and a compression section 14 compresses the compressed data group 30 according to a proper compression system respectively. A reception system 200 conducts expansion processing according to an expansion system proper to this compression system. The reception environment information 53 has information as to a transmission environment of a transmission line 90 and controls the compression system, in response to the transmission environment and the application can enhance transmission efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for compressing and transmitting data, and more particularly to a technique for transmitting a plurality of types of data using various compression methods.

[0002]

2. Description of the Related Art Conventionally, when data corresponding to different types of media such as voices, texts, images, etc. are transmitted, different compression methods have been employed to increase the efficiency of communication. If it is necessary to transmit high-quality information, a compression method capable of performing reversible compression and decompression on the receiving side (hereinafter, referred to as a “lossless compression method”) is adopted. If transmission is of low quality, irreversible compression is performed on the receiving side. A compression method for expansion (“irreversible compression method”) is employed.

[0003]

However, the quality of data required on the receiving side is not fixed, and varies depending not only on the type of the medium but also on its use. Therefore, in the case where the cost is high or congestion occurs on the transmission path through which data is transmitted, there is a problem that the data transmission by the lossless compression method lowers the communication efficiency. This is true not only when the transmission side and the reception side are connected by a transmission line, but also when the two sides are transported using a medium on which data is recorded. It is desirable to save storage capacity.

[0004] The present invention has been made in view of the above problems, and the type of media to which data to be transmitted corresponds,
It is an object of the present invention to change the form of data to be transmitted in accordance with the use, the environment of a transmission path, and the storage capacity of a medium, to improve efficiency in communication, or to reduce the storage capacity of a medium.

[0005]

Means for Solving the Problems Claim 1 of the present invention
The present invention relates to a transmission system including a receiving unit and a transmitting unit that performs transmission based on a plurality of input data to the receiving unit. The transmission unit receives the input data, based on the transmission environment, a compression method determination unit that determines a compression method for each of the input data, based on the compression method, based on the compression method, the input data A compression unit for compressing each of them to generate compressed data. The receiving unit has an expansion unit that generates expanded data using an expansion method corresponding to the compression method based on the compressed data.

[0006] The invention according to claim 2 is as follows:
The transmission system according to claim 1, wherein the compressed data is transmitted via a transmission path provided between the transmission unit and the reception unit, and the reception unit detects an environment in the transmission path, The image processing apparatus further includes a detection unit that provides the result to the compression method determination unit of the transmission unit.

According to the third aspect of the present invention,
The transmission system according to claim 1, wherein the transmission unit includes:
A plurality of pieces of compressed data corresponding to the same input data are transmitted in ascending order of information.

According to a fourth aspect of the present invention,
The transmission system according to claim 1, wherein the transmission unit includes:
A plurality of post-compression data corresponding to the same input data is transmitted in descending order of priority.

[0009] According to a fifth aspect of the present invention,
5. The transmission system according to claim 4, wherein the input data is stereo audio data, and the transmission unit first transmits the first compressed data corresponding to a sum of both channels of the stereo audio data, Next, the second post-compression data corresponding to the difference between the two channels is transmitted.

[0010] The invention according to claim 6 is as follows:
The transmission system according to claim 1, wherein the transmission unit includes:
A first storage unit that registers the input data that has been the basis of transmission a predetermined number of times or more in the first storage unit, and the input that is substituted by the registered data registered in the first storage unit The data further includes a search / registration processing unit that sets the index of the registered data as a transmission target and notifies the compression unit that compression of the transmission data does not need to be performed. The receiving unit registers the decompressed data corresponding to the input data registered in the second storage unit and the input data registered in the first storage unit in the second storage unit, based on the received index. A read / registration processing unit for reading registered data registered in the second storage means;

[0011] The present invention according to claim 7 includes:
7. The transmission system according to claim 6, wherein, when the decompressed data obtained by the irreversible compression and decompression is registered in the second storage unit, the input data corresponding to the decompressed data is the input data. The data is separately transmitted from the first storage unit to the second storage unit.

[0012] The present invention according to claim 8 includes:
7. The transmission system according to claim 6, wherein the search / registration processing unit, when registering the input data in the first storage unit, determines that a compression method corresponding to the input data is a lossless compression method. Is also a condition for registration.

[0013]

DETAILED DESCRIPTION OF THE INVENTION 1 and 2 are block diagrams conceptually showing a transmission system according to the present invention. FIG. 1 shows the configuration of a transmission system 100 in detail, and FIG. 2 shows the configuration of a reception system 200 in detail. Is shown. In the transmission system, the transmission system 100 and the reception system 200 are mutually connected by a transmission line 90 of a closed system.

The transmission system 100 includes a compression method determination processing unit 11,
A compression unit 14 and a synthesis unit 15 are provided. The multimedia data 10 is input to the compression method determination processing unit 11. The multimedia data 10 is data in which data on a plurality of types of media used in recent multimedia are mixed and integrated, for example, text data 10
a, audio data 10b, digital watermark data 10c, still image 10d, sub-image 10e, moving image 10f, and other various data 10g. The various data 10g may specify, for example, a compression method.

The input multimedia data 10 is
The compression method is classified according to the compression method adopted in the compression method determination processing unit 11, and the lossy compressed data 31 and the low compressed data 3
2. Highly compressed data 33 and lossy compressed data 34 are classified. In this specification, these are referred to as compressed data group 30.
As a whole. The above-described classification by the compression method determination processing unit 11 is performed based on the input 52 about the use of the multimedia data 10 and the reception environment information 53 and 58 based on at least the environment of the transmission path 90.
The details will be described later in section B. The multimedia data 10 may include uncompressed data. This is shown as uncompressed data 39 in the figure. Whether the data is classified as uncompressed data is also determined in the compression method determination processing unit 11 as described later in section B.

The compressed data group 30 is input to the compression section 14. Then, the lossy compressed data 31 and the low compressed data 3
2. Highly compressed data 33 and irreversible compressed data 34
The data is compressed by the lossless compression unit 14a, the low compression unit 14b, the high compression unit 14c, and the irreversible compression unit 14d, and converted into the lossless compressed data 41, the low compression data 42, the high compression data 43, and the irreversible compression data 44, respectively. In this specification, these may be collectively referred to as compressed data 40. Information about which compression method is used is added to the data 40 after compression. Note that the compression unit 14 is not necessarily a reversible compression unit 14 that is independent of each other.
a, low compression section 14b, high compression section 14c, irreversible compression section 1
The compression method does not need to be configured from 4d, and a different compression method may be realized according to the classification in the data group 30 to be compressed.

The post-compression data 40 is input to the synthesizing unit 15, and the reversible compressed data 41, low-compressed data 42, high-compressed data 43, irreversible-compressed data 44 or further uncompressed data 39 are synthesized or time-sequentially. The transmission data 51 is provided to the transmission path 90. Various aspects of the synthesis are described below in Section C.

The receiving system 200 includes a transmission environment monitor 21
, A disassembly unit 22 and an extension unit 23. The transmission path 90 is connected to the transmission environment monitor 21 and receives the transmission data 51 or separately transmits the transmission path 9.
By monitoring the transmission state of the monitor signal given to 0, the environment of the transmission path 90, for example, the transfer rate is grasped. Then, the result is given to the decomposing unit 22 as the transmission path environment information 54. The decomposing unit 22 generates the reception environment information 53 based on at least the transmission path environment information 54 and feeds it back to the transmission system 100.

The transmission data 51 is further divided in time series by the decomposer 22, and the decompressed data group 60 classified into data for each compression system, or the uncompressed data 67
Is obtained. The decompressed data group 60 includes reversible compressed / decompressed data 61, low-compressed / decompressed data 62, and high-compressed / decompressed data 6 corresponding to the lossless compressed data 41, the low-compressed data 42, the high-compressed data 43, and the irreversible-compressed data 44, respectively.
3. Consisting of irreversible compression / decompression data 64. The uncompressed data 67 corresponds to the uncompressed data 39 of the transmission system 100. Various aspects of the division are also described below in section C.

The decompressed data group 60 is subjected to decompression processing in the decompression unit 23, and a compressed and decompressed data group 70 is obtained. Lossless compression / decompression data 61, low compression / decompression data 6
2. Since information regarding the compression method used in each of the high compression / decompression data 63 and the irreversible compression / decompression data 64 is added by, for example, an identifier, a resource fork, a header, or the like, each of them is decompressed. Reversible compression / decompression section 23a of the section 23, low compression / decompression section 2
3b, decompressed in the high compression / decompression unit 23c, and the irreversible compression / decompression unit 23d.
The data is converted into data 72 after low compression / expansion, data 73 after high compression / expansion, and data 74 after irreversible compression / expansion. The expansion unit 23 is not necessarily an independent reversible compression / expansion unit 23a, low compression / expansion unit 23b, high compression / expansion unit 23c, irreversible compression / expansion unit 23d.
The decompression method may be different depending on the classification in the data group 60 to be decompressed.

The contents of a post-compression data group 70 composed of data 71 after lossless compression / expansion, data 72 after low compression / expansion, data 73 after high compression / expansion, and data 74 after irreversible compression / expansion, or uncompressed data 67 , Receiving system 200
Output data 25, for example, text data 25
a, audio data 25b, digital watermark data 25c, still image 25d, sub-image 25e, moving image 25f, and other various data 25g. The output data 25 is provided for use by a use device 300 such as a person authentication device.

As described above, a plurality of types of data are compressed and transmitted according to different compression schemes according to the environment of the transmission path and its use, and the received data is decompressed by a decompression scheme corresponding to the compression scheme. The communication efficiency can be improved while securing a large amount of information. Of course, uncompressed data can also be transmitted.

Instead of using the transmission path 90, the transmission system 100 records the transmission data 51 on a recording medium, and conveys the recording medium to transport the recording medium 51 to the disassembling unit 22 of the receiving system 200.
The above-mentioned compression and decompression can also be applied to the case where the image data is supplied to a computer. In this case, the reception environment information 53 indicates the storage capacity of this recording medium, and the transmission environment monitor 21 is not required in the reception system 200.

In another case where it is not necessary to feed back the reception environment information 53 to the transmission system 100, the transmission environment monitor 16 can be provided in the transmission system 100. The transmission path 90 is connected to the transmission environment monitor 16. By receiving the transmission data 51 or monitoring the transmission state of a monitor signal separately given to the transmission path 90, the environment of the transmission path 90 is monitored. For example, the transfer rate is ascertained. The result is provided to the compression method determination processing unit 11 as transmission path environment information 58.
Therefore, the transmission system 100 can determine a compression method without requiring feedback from the reception system 200. For example, the compression method can be determined based on the determination that the transmission path 90 is for a mobile phone or an ISDN line.

B. Operation of Compression Method Judgment Processing Unit: FIG. 3 is a flowchart showing the operation of the compression method judgment processing unit 11. As described above, the compression method determination processing unit 11 is provided with the multimedia data 10 which is data to be transmitted, the input 52 having information on the use, and the reception environment information 53. The reception environment information 53 is transmitted from the transmission system 100 and the reception system 200 to the transmission line 90 as shown in FIGS.
When the connection is made by using the transmission line 90, not only the transfer rate of the transmission path 90 but also the cost in the transmission time zone may be included. Alternatively, it may further include a request signal requesting transmission of specific data. When a recording medium is carried between the transmission system 100 and the reception system 200, the storage capacity of the recording medium may be included.

Referring to FIG. 3, in step 110, the evaluation function and parameters used in the arithmetic processing are initialized so that there is no bias in the calculation and calculation of the evaluation function used hereinafter. In step 112, the logical sum of the initialized parameter and the input 52 is calculated. Table 1 shows an example of the correspondence between the numerical values of the input 52 and the use. In this way, information about the application is represented as a numerical value, and is used for generating an evaluation function later.

[0027]

[Table 1]

For example, the evaluation function is first selected in step 113 from the table stored in the application-specific parameter database 111 by the numerical value of the input 52. For example, when the numerical value of the input 52 takes 0, Table 1
The application of the multimedia data 10 is “general communication” as shown in FIG. In this case, a compression method suitable for general communication is read from the use-specific parameter database 111. However, the parameter database for each application 11
1 shows a plurality of compression methods corresponding to the contents of the reception environment information 53 and the type of the medium in which the data is used, for each application. Alternatively, it may indicate that a predetermined default compression method is adopted.
The evaluation function can be represented as a numerical sequence of multiple digits.

The evaluation function is updated in step 114 using the media information 118. Table 2 shows an example of the correspondence between the numerical values of the media information 118 and the types of media.

[0030]

[Table 2]

For example, in step 114, the evaluation function can be updated by adding the numerical value of the media information 118 to the end of the evaluation function generated in step 113.

On the other hand, in step 115, an arithmetic process is performed to digitize the reception environment information 53 for use in updating the evaluation function again. Then, based on the result, the evaluation function updated in step 114 is updated again in step 116. In steps 114 and 116, the type of media and the state of the environment are given, so that one of a plurality of compression methods presented in the use-specific parameter database 111 is selected.

However, the details of the compression method may be finely adjustable. Table 3 exemplifies the contents of the evaluation function 117 obtained in step 116.

[0034]

[Table 3]

Here, four types of setting items are illustrated, and the evaluation function can be set as a sequence of numerical values in which these numerical values are arranged in different digits. “Use of fixed combination”, which is indicated by the numerical value 1 in the upper left column of Table 3, indicates that a predetermined default compression method is adopted, and “there is compression processing determination” that the numerical value 0 means. , Which means that the compression method is set according to the compression processing determination in step 201 and subsequent steps.

In the upper right column of Table 3, numerical values corresponding to whether the compression method is reversible or irreversible are shown. In the lower left column, correspondences with numerical values for more specific compression methods are shown. The contents shown in the upper left column, the upper right column, and the lower left column of Table 3 can be adopted, for example, in a table stored in the application-specific parameter database 111.

However, the use-specific parameter database 111 may indicate that option data such as a compression ratio and a sampling rate for a certain use is determined based on the reception environment information 53. In that case, step 116 is executed for the option data.
Is set for the first time. For example, the compression ratio and the sampling rate can be calculated in the arithmetic processing of step 115. The lower right column of Table 3 illustrates the correspondence between such option data and numerical values. For a compression method for which the compression ratio cannot be specified, the compression ratio can be set to be ignored. As described above, the evaluation function 117 also includes parameters such as the type of compression method and its compression ratio.

As shown schematically in FIG. 1, when the compression section 14 is composed of a reversible compression section 14a, a low compression section 14b, a high compression section 14c, and an irreversible compression section 14d which are independent of each other. May not necessarily need to generate the evaluation function 117. However, the compression unit 14 does not necessarily need to adopt a configuration independent of each other for each compression method.
When such a configuration is not adopted, the compression unit 14 appropriately compresses the lossless compressed data 31, the low compressed data 32, the high compressed data 33, and the lossy compressed data 34 based on the evaluation function 117. Compression can be performed using parameters such as the method and the compression ratio.

C. Aspects of synthesis / decomposition: FIG. 4 is a conceptual diagram showing various aspects of synthesis. 11A shows the case of normal synthesis, FIG. 10B shows the case of superposition synthesis, FIG. 10C shows the case of difference addition synthesis, and FIGS. 11D and 11E show multi-progressive synthesis. FIG. 1F shows the first and second modes, and FIG. 1G shows the case of two-channel arithmetic synthesis, and FIG. 2G shows the case of two-channel arithmetic synthesis. 3 shows a mode of a series. Such a configuration is performed in the synthesizing unit 15. Generally, when transferring data, header information is added. The header information may be subjected to compression processing together with other data or independently. In the former case, the header information and other data can be grasped as one data in the multimedia data 10.

The normal composition is a general configuration method, and data is arranged in series in a time series (FIG. 4A).
After that, the still image 10d, the audio data 10b, and the moving image 1
0f each compressed. It can generate compressed still image data, compressed audio data, and compressed moving image data.
Further, an index described later in section D may be added.

In the superimposition synthesis, for example, a still image and digital watermark data are superimposed to obtain one still image data with a digital watermark, and, for example, a moving image and audio data are superimposed to form one moving image with audio. Image data is obtained (FIG. 4
(B)). As described above, by superimposing data according to a predetermined application, the amount of data required for transmission is reduced as compared with individual transmission. At this time, it is desirable to add control data for superimposition. For example, for still images with digital watermarks, watermark control data that specifies how strong a watermark is to be inserted, and for a moving image with audio, at what timing of the moving image the audio is inserted, etc. Are respectively added.

Of course, the still image and the digital watermark data can be superimposed before the compression processing, and the compression processing can be performed on the data integrated by the superimposition. In this case, the still image 10 is already included in the multimedia data 10.
Since the electronic watermark data 10c is superimposed on d, the data may be transmitted as one piece of data instead of the above-described superimposition synthesis. Then, it may be used while being superimposed on the use device 300, or the use device 300
, The still image and the digital watermark data may be separated.

In the case of the difference addition synthesis, the differences of the elements for deforming the still image are sequentially arranged (FIG. 4C). For example, data such as glasses and wigs are added to a still image of a person, which is a still image of a person. The glasses data and the wig data do not include data on the face of a person, but are data on the glasses or the wig alone. Although these transform still images, they are merely arithmetic differences,
For example, instead of a difference regarding a change in motion in a moving image, the image itself has a meaning as one image. The difference addition synthesis can be applied not only to images but also to audio. In this case, an index may be added.

In the first multi-progressive mode, certain information is compressed by a plurality of different compression methods (FIG. 4D). For example, in the illustrated example, for a certain still image, an alternative still image that can be replaced with this still image and has a small data amount, an image that is compressed by a high compression method regardless of lossless / irreversible, irreversible compression The image compressed by the method and the image compressed by the reversible method are transmitted in time series in this order. Since the data with the smaller data amount is transmitted first, if the data amount that satisfies the data amount necessary for the application on the receiving side is obtained, the transmission can be interrupted at that point, and the communication efficiency can be improved. Also, data obtained by different compression methods can be referred to each other.

In the second mode of multi-progressive, different data such as images and sounds are set as one set,
Compression is performed using a different compression method for each set (FIG. 4E). In the example shown in the figure, image data, audio data, and text data are one set, and three different compression methods are applied to the same set. For example, "image 1", "image 2", "image 3"
Are images obtained by compressing the same still image by different compression methods. The information amount of “image 2” is larger than that of “image 1”, and that of “image 3” is larger than that of “image 2”.
Therefore, as in the first aspect of the multi-progressive transmission, if a data that satisfies the data amount necessary for the application on the receiving side is obtained, the transmission can be interrupted at that point, and the communication efficiency can be improved. . And, for example, transmission line 9
Even if the transmission is stopped in the middle due to the state of 0, it is easy to secure all the data of one set for the time being.

Of course, the information of the image 2 may supplement the information of the image 1, and the information of the image 3 may further supplement the information of the image 1 and the information of the image 2. An example of this mode is a progressive format in the JPEG system. In this case, "image 2" is not necessarily "image 1"
, And “Image 3” does not always have a larger amount of information than “Image 2”. However, even if the transmission is interrupted in the same manner as described above, the information transmitted before Thus, it is easy to temporarily secure all data of one set.

In the present specification, not only the information amount is small, but also information to be supplemented by certain information is expressed as “coarse”. Accordingly, in the case of the progressive format as well as in the case of FIG. 4E, it can be said that the preceding information is coarser in information than the succeeding information. Also in the case of the difference addition synthesis, in the above example, it can be grasped that the personal photograph still image is supplemented by the glasses data or the wig data, so that it can be said that the information is transmitted in order from coarse data.

In the prioritized combination, priority information is added to each data (FIG. 4 (f)). Data is transmitted sequentially from the one with the highest priority. In the example shown in the figure, the fact that “compressed still image 1” has priority over “compressed still image 2” and “compressed audio data” is indicated by “priority A” and “priority B "to the receiving system 200. Therefore, in the receiving system 200, transmission can be interrupted in consideration of the priority, and the strength of error correction in the receiving system 200 can be controlled.

The two-channel arithmetic synthesis is used, for example, for transmitting stereo audio data. The left and right channels of the audio make a pair, and the sum and difference of the two are transmitted in this order (FIG. 4 (g)). “L + R compressed audio”, which is data indicating the sum of the left and right channels, corresponds to monaural audio. The “LR compressed voice” which is the data indicating the difference between the left and right channels may not have a significant meaning as the voice data itself, but is halved by adding “L + R compressed voice” in the use device 300. The left channel can be restored by calculation, and the right channel can be restored by subtracting from the “L + R compressed audio” and halving it. Therefore, when monaural audio is sufficient on the side of the use device 300, transmission can be interrupted when "L + R compressed audio" is transmitted, and communication efficiency can be improved. The “transmission determination flag” sandwiched between “L + R compressed voice” and “LR compressed voice” indicates that if monaural voice is sufficient, subsequent transmission is unnecessary.

On the other hand, regarding the disassembly, the transmission path environment information 5
4 is provided to the disassembly unit 22. Usage device usage information 55 about the usage of the usage device 300 and usage device environment information 56 indicating the environment of the usage device 300 may be further provided. For example, when the usage application of the usage device 300 is a person authentication and the digital watermark data 25c is required, the information amount may not be enough with the irreversibly compressed and decompressed data. On the other hand, even if the usage device 300 is a stereo reproduction device, if data is in an environment where one channel is out of order, data on both the left and right channels is unnecessary.

The reception environment information 53 is generated based on the use and environment of the utilization device 300 and the environment of the transmission path 90, and is fed back to the transmission system 100. Transmission can be suppressed.

FIG. 5 is a block diagram showing details of the structure of the disassembling section 22. In the decomposing unit 22, the receiving unit 221 is connected to the transmission path 90, and controls whether or not the transmission data 51 can be received based on the reception control information 57. Receiver 221
The transmission data 51 received by the transmission unit 51 is temporally divided by the separation unit 222 and output as the division data 60a indicated by each block in FIG.

The reception environment judgment unit 223 includes the transmission path environment information 54 obtained from the transmission environment monitor 21,
The receiving environment information 53 is generated based on the usage device usage information 55 and the usage device environment information 56 obtained from 0. In addition, the reception control information 5
7 is generated. Of course, for example, when data is transmitted by a recording medium without using the transmission line 90, the reception environment information 53 can be replaced with the usage device usage information 55 and the usage device environment information 56, and the transmission system 100 transmits the data. When the environment monitor 16 is provided, the reception environment information 53 need not be generated.

For example, as described above, when the use apparatus 300 uses not a person authentication but an image with a smaller amount of information, only the “alternative still image” shown in FIG. In some cases, it is not necessary to receive even a “lossless compressed still image”. Alternatively, it is sufficient to receive only “image 1”, “voice 1”, and “character 1” shown in FIG. 4E, and it is necessary to receive even “image 2”, “voice 2”, and “character 2”. May not be. In addition, it is sufficient to receive only the “compressed still image 1” shown in FIG. 4 (f) prefixed with “priority A”, and it may not be necessary to receive even the “compressed still image 2”. . In such a case, the reception environment judgment unit 223 monitors the segmented data 60a, so that the reception control information 57 interrupts the reception of the transmission data 51 of the reception unit 221.

If it is recognized from the use device environment information 56 that one of the channels of the stereo reproduction device as the use device 300 is out of order, the data of both the left and right channels become unnecessary. , It is sufficient to receive only the “L + R compressed voice”, and it may not be necessary to receive even the “LR compressed voice”. In such a case, the reception control information 57
The reception of the transmission data 51 by the receiving unit 221 is interrupted.

In the case shown in FIG. 4C,
Based on the “personal photograph still image”, the “glasses data”, and the “wig data”, it is possible to obtain an image in which the use device 300 causes the photographer to wear glasses or attach a wig.

The divided data 60a is sent to the error correction unit 2
The error correction data is also input to the data 24 and error correction is performed, and corrected segmented data 60b is generated. As described above, the strength of the error correction at this time can be controlled based on the priority of the transmission data 51 subjected to the priority-added synthesis.

The post-correction section data 60b is further provided to a synchronous data decomposition section 225. In the case shown in FIG. 4 (b), the moving image data and the audio data are not once divided, but become a group of corrected divided data 60b. However, the synchronous control data is partitioned, and the synchronous data decomposing unit 225 can partition both based on the synchronous control data. Similarly, still image data and digital watermark data can be separated by watermark control data. As described above, the synchronous data decomposing unit 2
Reference numeral 25 gives the decompressed data group 60 classified into data for each compression method to the decompression unit 23.

D. Use of existing content: FIGS. 6 and 7
FIG. 6 is a block diagram conceptually showing a modification of the transmission system according to the present invention. FIG.
FIG. 7 shows the configuration of the receiving system 200 in detail. Transmission system 100 and reception system 200 in a transmission system
Are interconnected by a transmission line 90.

As compared with the configuration shown in FIG. 1, the transmission system 100 shown in FIG. 6 has a search / registration processing unit 12 to which the compressed data group 30 inputs and a common content database 1
3 is additionally provided. Compared with the configuration shown in FIG. 2, the receiving system 200 shown in FIG. 7 additionally includes a read / registration processing unit 24 to which the compressed / decompressed data group 70 is input, and a common content database 26. ing.

When the data constituting the compressed data group 30 has been transmitted a predetermined number of times or more, the search / registration processing unit 12 registers the content in the existing content database 13. The number of times of transmission may be stored in the number of times registration database 13a in the existing content database 13, and may be updated each time transmission is performed. In addition, registration information 46 is provided to the compression unit 14 for data included in the compressed data group 30 and registered in the existing content database 13. The registration information 46 may be compressed together with the data.
5 may be given. FIG. 6 shows the former case.

The transmission data 51 having the registration information 46 is
The data is compressed / expanded or divided in the receiving system 200 to obtain registration information 66, and the read / registration processing unit 24
Given to. FIG. 7 shows a case where the registration information 66 is obtained by compression and decompression. The read / registration processing section 24 transmits the transmission system 100
In step (2), the data corresponding to the data stored in the existing content database 13 is detected based on the data registration information 66, and the detected data is registered in the existing content database 26. Therefore, of the data of the compressed data group 30, data corresponding to the data stored in the existing content database 13 is also stored in the existing content database 26 in the receiving system 200.

Here, "corresponding" does not necessarily mean that the contents of the data are completely the same. When the lossless compression / decompression is performed, the existing content databases 13, 26
This is because the data of the same content is stored in the, but not when the lossy compression / decompression is performed. The handling in the latter case will be described later.

For data transmitted a predetermined number of times or more as described above, the receiving system 200
Stored in the same way as 0. Therefore, for such data, the communication efficiency can be improved by transmitting only the index added when storing the data without transferring the data itself.

Specifically, the search / registration processing unit 12 performs a search as to whether or not to use data already stored in the existing content database 13 instead of the data constituting the compressed data group 30. During this search,
For example, character string recognition, image recognition, voice recognition, and keyword recognition are employed. The alternative still image shown in FIG. 4D is also employed in such a search.

For the data to be replaced, a compression unnecessary signal 47 is given to the compression section 14 to notify that compression processing does not need to be performed. On the other hand, the index 45 of the substitute data in the existing content database 13 is given to the synthesizing unit 15. Therefore, in this modification, the post-compression data 40 includes the index 45.

As described above, the transmission data 51 includes the index 45. In the receiving system 200, the decomposing unit 22 separates this as an index 65 and supplies it to the reading / registering processing unit 24. Based on the index 65, the read / register processing unit 24 adds the data stored in the existing content database 26 corresponding to the index 65 to the post-compression data group 70 as read data 75.

The uncompressed data 67 is transmitted without transmitting the uncompressed data 39, using the existing content databases 13 and 26 in the same manner as the compressed data, adopting the indexes 45 and 65, and reading out the read data. 75 can be obtained.

The search / registration processing unit 12 determines whether to use the data already stored in the existing content database 13 instead of the data constituting the compressed data group 30, for example, the same between the two. It is determined by whether or not there is sex. Alternatively, for example, a determination may be made that a still image is replaced by a sub-image already stored in the common content database. Such a determination is suitable when the environment of the transmission path is degraded. In that case, a signal 35 is given from the compression method determination processing unit 11 to the search / registration processing unit 12 so that the still image is It is desirable to be notified that substitution is permitted. Transmission line 90
Of the compression method determination processing unit 1 as the reception environment information 53
This is because 1 knows. Such a notification can also be included in the evaluation function 117. Of course, the reception environment information 53 may be directly supplied to the search / registration processing unit 12, and the search / registration processing unit 12 itself may make the above determination.

Now, in the case where data obtained by irreversible compression / decompression is stored in the existing content database 26, the following handling is conceivable. As a first handling, for example, data stored in the existing content database 26 is directly used as the output data 25. In this case, it is desirable not to transfer the output data 25 to another receiving system. This is to avoid cumulative deterioration of the data due to the function of the receiving system 200 as the transmitting system.

Alternatively, as a second handling, separately during a period when the transmission data 51 is not transmitted through the transmission line 90,
By transmitting the data stored in the existing content database 13 to the existing content database 26 via the transmission path 90, the existing content database 2
6 may be updated to data before the compression / decompression processing is performed. As a result, it is possible to prevent information from being degraded even when only the index is transmitted.

As still another or third handling, the existing content database 1 by the search / registration processing unit 12 is used.
3, the data constituting the compressed data group 30 has been transmitted not less than a predetermined number of times.
Lossless compression may be a necessary condition. In this case, also in the receiving system 200, the data subjected to the reversible pressure expansion is stored in the existing content database 26 by the read / register processing unit 24, so that the transmission data 51 is kept identical between the existing content databases 13 and 25. be able to.

The first handling is the simplest, the second handling is less likely to hinder communication efficiency by use of the index than the third handling, and the third handling is more efficient than the second handling. In addition, they are superior in that no separate transmission is required.

[0074]

According to the transmission system of the first aspect of the present invention, a plurality of input data are compressed and transmitted by different compression methods according to the transmission environment, and the received data is compatible with the compression method. Since it is expanded by the expansion method,
The communication efficiency can be improved while securing the necessary information amount.

According to the transmission system of the second aspect of the present invention, the compression method determination unit can determine the compression method based on the environment in the transmission path.

According to the transmission system according to claim 3 or the transmission system according to claim 4 of the present invention, the transmission can be interrupted when a necessary amount of information is obtained, thereby improving the communication efficiency. be able to.

According to the transmission system of the fifth aspect of the present invention, the audio data of both channels can be restored from the first compressed data and the second compressed data, while the first compressed data is restored. Even when only the subsequent data is received, it can be used as monaural audio data.

According to the transmission system of the present invention, it is possible to improve communication efficiency by transmitting only the index added when registering the input data without transferring the input data itself. it can.

According to the transmission system of the present invention, the information is not degraded and the efficiency of the communication by using the index is not hindered. Obtainable.

According to the transmission system of the eighth aspect of the present invention, the effect of the transmission system of the sixth aspect can be obtained without deteriorating information and without requiring separate transmission. .

[Brief description of the drawings]

FIG. 1 is a block diagram conceptually showing a transmission system according to the present invention.

FIG. 2 is a block diagram conceptually showing a transmission system according to the present invention.

FIG. 3 is a flowchart illustrating an operation of a compression method determination processing unit 11;

FIG. 4 is a conceptual diagram showing various synthesis modes.

FIG. 5 is a block diagram showing details of a configuration of a disassembling unit 22.

FIG. 6 is a block diagram conceptually showing a modification of the transmission system according to the present invention.

FIG. 7 is a block diagram conceptually showing a modification of the transmission system according to the present invention.

[Explanation of symbols]

 Reference Signs List 10 input data 10a text data 10b audio data 10b 10c digital watermark data 10d still image 10e sub-image 10f moving image 10g other various data 11 compression method determination processing unit 14 compression unit 14a lossless compression unit 14b low compression unit 14c high compression unit 14d Lossless compression unit 15 Synthesis unit 16, 21 Transmission environment monitor 22 Separation unit 23 Expansion unit 23a Reversible compression / expansion unit 23b Low compression / expansion unit 23c High compression / expansion unit 23d Irreversible compression / expansion unit 30 Compressed data group 31 Lossless compressed data 32 Received Low compression data 33 High compression data 34 Irreversible compression data 40 Compressed data 41 Lossless compression data 42 Low compression data 43 High compression data 44 Irreversible compression data 51 Transmission data 52 Input 53,58 Reception environment information 60 Decompression data group 61 Suffered Lossless compression / decompression data 62 Low compression / decompression data 63 High compression / decompression data 64 Irreversible compression / decompression data 71 Data after lossless compression / decompression 72 Data after low compression / decompression 73 Data after high compression / decompression 74 Data after lossy compression / decompression 90 Transmission path 100 Transmission system 200 Receiving system

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5C059 KK25 KK43 MA00 MA45 PP01 PP04 RC32 RC35 RE07 RE15 RE16 RE20 RF04 SS06 SS11 SS30 TA16 TA74 TA75 TB01 TC15 TC21 TC24 TC27 TC38 TC39 TD16 UA02 UA05 5J064 AA02 BA01 BC02 BC08 BD02

Claims (8)

[Claims] 1. A receiving unit comprising: a receiving unit; and a transmitting unit configured to perform transmission based on a plurality of input data to the receiving unit. The transmitting unit inputs the input data, and based on an environment of the transmission,
A compression scheme determination unit that determines a compression scheme for each of the input data; and a compression unit that compresses each of the input data to generate compressed data based on the compression scheme, A transmission system comprising: a decompression unit that generates decompressed data based on the post-compression data using a decompression method corresponding to the compression method. 2. The compressed data is transmitted via a transmission line provided between the transmission unit and the reception unit. The reception unit detects an environment in the transmission line, and transmits a result of the detection to the transmission unit. The transmission system according to claim 1, further comprising a detection unit provided to the compression method determination unit. 3. The transmission system according to claim 1, wherein the transmission unit transmits a plurality of pieces of compressed data corresponding to the same input data in descending order of information. 4. The transmission system according to claim 1, wherein the transmission unit transmits a plurality of pieces of compressed data corresponding to the same input data in descending order of priority. 5. The input data is stereo audio data, and the transmission unit first transmits the first post-compression data corresponding to the sum of both channels of the stereo audio data, and then transmits the two channels. The transmission system according to claim 4, wherein the second data after the compression corresponding to the difference is transmitted. 6. The transmission unit registers, in a first storage unit, the input data serving as a basis for transmission a predetermined number of times or more in the first storage unit, and the registration unit registers the input data in the first storage unit. A search / registration processing unit for notifying the compression unit that compression of the transmission data does not need to be performed with the index of the registered data as a transmission target for the input data substituted by the registered data; The receiving unit has a second storage unit, and registers the decompressed data corresponding to the input data registered in the first storage unit in the second storage unit;
2. The transmission system according to claim 1, further comprising: a read / registration processing unit that reads registered data registered in the second storage unit based on the received index. 7. When the decompressed data obtained by irreversible compression and decompression is registered in the second storage means, the input data corresponding to the decompressed data is stored in the first storage means. The transmission system according to claim 6, wherein the transmission is separately performed to the second storage unit. 8. The search / registration processing unit, when registering the input data in the first storage unit, also requires that a compression method corresponding to the input data be a lossless compression method. The transmission system according to claim 6, wherein: