JP2008005281A - Communication apparatus and system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform error correction in a synchronous network simultaneously operated with an asynchronous network, by comparing random data for error detection received from the synchronous network with a random data generated by using an identical rule to the above random data for error correction, and by inverting the corresponding bit value of media data synchronized with the random data for error detection when the above random data are different. <P>SOLUTION: A communication apparatus 10 includes a receiving means 10a for receiving from a synchronous network 31 the random data for error detection generated in conformity with the predetermined rule, and for receiving from an asynchronous network 32 the media data synchronized with the random data for error detection; a random data generating means 10b for generating the random data according to the identical rule to the random data for error detection; a comparing means 10c for comparing the generated random data with the random data for error detection received from the synchronous network 31; and an error data inverting means 10d for inverting the corresponding bit value of the media data synchronized with the random data for error detection, when the above random data are different. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a communication device connected to a network such as the Internet or a public line, and relates to a communication device such as a fixed telephone, a cellular phone, and a PHS using packet communication and line switching, and a communication system including the communication device.

  Conventionally, in packet communication, it is known that packet loss and jitter (delay fluctuation) occur due to the use of asynchronous communication. For this reason, even if the communication device that has received the data decodes the data as it is, the quality of the data may deteriorate.

  FIG. 9 is a block diagram showing the configuration of a conventional communication system. In FIG. 9, reference numeral 100 denotes a receiving communication device, 100 'denotes a transmitting communication device, and 200 denotes a line network. The line network 200 includes an asynchronous network (packet line network) 201. The reception side communication device 100 is connected to the asynchronous network 201 via the communication path N101, and the transmission side communication device 100 ′ is connected to the asynchronous network 201 via the communication path N102. The communication device 100 ′ can communicate via the asynchronous network 201.

  The transmission side communication device 100 ′ transmits voice data, image data, text data, and control data to the asynchronous network 201. The communication path N102 is a communication path from the transmission-side communication apparatus 100 ′ to the asynchronous network 201, and packet loss, jitter, and the like may occur on this path, which may degrade data quality. For example, in the case of a mobile phone, these packet loss and jitter are likely to occur when the environment is weak due to a weak electric field. The asynchronous network 201 acquires data from the transmission side communication device 100 ′, performs predetermined processing on the data, and transmits the data to the reception side communication device 100.

  The communication path N101 is a communication path from the asynchronous network 201 to the receiving-side communication apparatus 100. Like the communication path N102, packet loss, jitter, and the like may occur, and data quality may be degraded. The receiving communication device 100 receives data from the transmitting communication device 100 ′ via the asynchronous network 201, and performs processing for reproducing audio data, image data, text data, and the like.

  FIG. 10 is a flowchart for explaining an example of processing in the conventional communication system. Here, a communication process between the network 200 and the receiving-side communication apparatus 100 illustrated in FIG. 9 will be described.

  First, the asynchronous network (packet line network) 201 included in the line network 200 asynchronously transmits media data composed of voice, image, text, control data, and the like (step S101). At this time, in the communication path N101 from the asynchronous network 201 to the receiving-side communication device 100, an error may occur in data due to a communication environment such as a weak electric field.

  Next, the receiving communication device 100 receives media data sent from the asynchronous network 201 (step S102). Regardless of the occurrence of an error, the receiving-side communication device 100 performs the received media data reproduction process (step S103). In other words, even if an error occurs in the received asynchronous data, the receiving communication apparatus 100 reproduces the data in a state including the error, thereby degrading the data quality.

  FIG. 11 is a flowchart for explaining another example of processing in the conventional communication system. Here, communication processing between the transmission side communication apparatus 100 ′ and the line network 200 and between the line network 200 and the reception side communication apparatus 100 shown in FIG. 9 will be described.

  First, the transmission-side communication device 100 ′ transmits media data composed of voice, image, text, control data, and the like to the asynchronous network 201 (step S111). At this time, an error may occur in the data on the communication path N102 from the transmission side communication device 100 ′ to the asynchronous network 201.

  Next, the asynchronous network 201 receives the media data sent from the transmission side communication device 100 ′ (step S112). The asynchronous network 201 performs processing on the media data received from the transmission-side communication device 100 ′, and transmits the media data asynchronously (step S113). At this time, an error may occur in the data on the communication path N101 from the asynchronous network 201 to the receiving communication device 100.

  Next, the receiving side communication device 100 receives media data sent from the asynchronous network 201 (step S114). Regardless of the occurrence of an error, the receiving-side communication device 100 performs a reproduction process on the received media data (step S115). In other words, even if an error occurs in the received asynchronous data, the receiving communication apparatus 100 reproduces the data in a state including the error, thereby degrading the data quality.

  In order to prevent such deterioration of data quality in packet communication, a method of discarding / retransmitting a packet in which an error has occurred is generally used. For example, in a wireless packet communication system including a plurality of terminals, a receiving terminal receives a packet sent from a transmitting terminal with a destination address specified. The receiving terminal detects an error of the received packet, and when no error is detected, transmits an Ack signal for delivery confirmation to the transmitting terminal. On the other hand, when an error is detected, the received packet is discarded. For this error detection, for example, cyclic redundancy check (CRC) is used.

  When the transmitting terminal receives the Ack signal from the receiving terminal, the transmitting terminal confirms that the receiving terminal has successfully received the packet. On the other hand, when the receiving terminal does not receive the Ack signal for a certain period of time, the receiving terminal receives the packet. Judge that it failed and try to retransmit the packet. In this way, the data quality is guaranteed by retransmitting the packet.

  However, the above-described packet retransmission scheme has a problem that data transmission delay is large and is not suitable for data transmission that requires real-time property such as moving images in multimedia communication.

On the other hand, a wireless communication apparatus that guarantees the real-time property of data such as moving images in packet communication has been proposed (see, for example, Patent Document 1). This is because a switch for enabling or disabling error detection by CRC of the data link reception unit is provided in the wireless communication device. When the data included in the received packet is asynchronous data such as file access, the switch The error detection is enabled, and when it is isochronous data such as a moving image, the error detection is disabled by a switch. That is, if asynchronous data is received and the packet contains an error, the packet is discarded. If isochronous data is received, the packet is not discarded even if an error is detected in the packet. The Ack signal is transmitted to the transmitting terminal.
JP 2002-185550 A

  However, in the case of the invention described in Patent Document 1, in the case of asynchronous data such as file access, the packet is retransmitted and the data quality is guaranteed, but the real-time property is not maintained. In the case of isochronous data such as a moving image, the packet is not retransmitted and the real-time property is maintained, but the data quality is not guaranteed.

  As described above, in conventional packet communication including Patent Document 1, packet error, jitter, and the like occur due to the influence of asynchronous communication or the like. For this reason, the quality of media data composed of voice, image, text, control data, and the like deteriorates. Also, when retransmitting a packet, the data quality is guaranteed, but the real-time property of data such as a moving image cannot be guaranteed.

  The present invention has been made in view of the above circumstances, and operates the synchronous network and the asynchronous network at the same time, receives error detection random data generated according to a predetermined rule from the synchronous network, and from the asynchronous network. The media data synchronized with the error detection random data is received, the received error detection random data is compared with the random data generated according to the same rule as that data, and if they are different, the data is synchronized with the error detection random data. It is an object of the present invention to provide a communication device that performs error correction by inverting the value of a corresponding bit of media data, and a communication system having the communication device.

  In order to solve the above-mentioned problem, the first technical means of the present invention is to provide an error generated from a synchronous network according to a predetermined rule in a communication apparatus that performs data communication via a circuit network including a synchronous network and an asynchronous network. Receiving means for receiving random data for detection and receiving media data synchronized with the random data for error detection from the asynchronous network; and random data generating means for generating random data according to the same rules as the random data for error detection And comparing means for comparing the generated random data with the error detection random data from the synchronous network, and if both are different by the comparison means, the corresponding bit of the media data synchronized with the error detection random data An error bit inversion means for inverting the value is provided.

  According to a second technical means, in a communication device that performs data communication via a circuit network including a synchronous network and an asynchronous network, the error detecting random data generated according to a predetermined rule is received from the synchronous network, and the asynchronous Receiving means for receiving media data synchronized with the random data for error detection from a network; random data generating means for generating random data according to the same rules as the random data for error detection; and the generated random data and the synchronous network A comparison means for comparing the error detection random data from the counter, a counting means for counting the number of bits of the media data synchronized with the error detection random data, if the comparison means differs, and the count result Transmission data amount varying means for varying the transmission data amount according to It is obtained by the butterfly.

  According to a third technical means, in a communication device that performs data communication via a circuit network including a synchronous network and an asynchronous network, the error detecting random data generated according to a predetermined rule is received from the synchronous network, and the asynchronous Receiving means for receiving media data synchronized with the random data for error detection from a network; random data generating means for generating random data according to the same rules as the random data for error detection; and the generated random data and the synchronous network A comparison means for comparing the error detection random data from the counter, a counting means for counting the number of bits of the media data synchronized with the error detection random data, if the comparison means differs, and the count result Codec type changing means for changing the codec type accordingly It is obtained by the features and.

  A fourth technical means is a communication system having a communication control device that controls a line network composed of a synchronous network and an asynchronous network, and a communication device that performs data communication via the line network. Error detection random data generating means for generating error detection random data according to the rules of the above, and transmission means for synchronizing the generated error detection random data and media data and transmitting them from the synchronous network and the asynchronous network, respectively The communication device comprises: random data generating means for generating random data according to the same rules as the error detection random data; and comparing the generated random data with error detection random data from the synchronous network And the medium synchronized with the error-detecting random data when they are different by the comparison means It is obtained by it said that a error bit inverting means for inverting the value of the specified bit over data.

  According to a fifth technical means, in the fourth technical means, the communication device on the transmission side generates error detection random data generating means for generating error detection random data according to a predetermined rule, and the generated error detection random data. Transmission means for transmitting data and media data in synchronization with each other, and the communication control device generates random data according to the same rules as the error detection random data, and the generated random data Comparing means for comparing error detecting random data from the transmission side communication device and an error bit for inverting the value of the corresponding bit of the media data synchronized with the error detecting random data when both are different by the comparing means And a reversing means.

  A sixth technical means is a communication system having a communication control device for controlling a line network composed of a synchronous network and an asynchronous network, and a communication device for performing data communication via the line network. Error detection random data generating means for generating error detection random data according to the rules of the above, and transmission means for synchronizing the generated error detection random data and media data and transmitting them from the synchronous network and the asynchronous network, respectively The communication device comprises: random data generating means for generating random data according to the same rules as the error detection random data; and comparing the generated random data with error detection random data from the synchronous network And the comparison means, the media data synchronized with the error detection random data is different. Counting means for counting the number of relevant bits of the data is obtained by characterized by comprising a transmission data amount varying means for varying the amount of transmitted data in accordance with the count result.

  A seventh technical means is the sixth technical means, wherein the communication device on the transmission side generates error detection random data generating means for generating error detection random data according to a predetermined rule, and the generated error detection random data. Transmission means for transmitting data and media data in synchronization with each other, and the communication control device generates random data according to the same rules as the error detection random data, and the generated random data Comparison means for comparing the error detection random data from the communication device on the transmission side, and a counting means for counting the number of corresponding bits of the media data synchronized with the error detection random data if both are different by the comparison means, And a transmission data amount varying means for varying the transmission data amount according to the count result. It is obtained by it said.

According to an eighth technical means, in a communication system having a communication control device that controls a line network including a synchronous network and an asynchronous network, and a communication device that performs data communication via the line network, the communication control device is Error detection random data generating means for generating error detection random data according to the rules of the above, and transmission means for synchronizing the generated error detection random data and media data and transmitting them from the synchronous network and the asynchronous network, respectively The communication device comprises: random data generating means for generating random data according to the same rules as the error detection random data; and comparing the generated random data with error detection random data from the synchronous network And the comparison means, the media data synchronized with the error detection random data is different. Counting means for counting the number of corresponding bits of data,
Codec type changing means for changing the type of codec according to the count result is provided.

  According to a ninth technical means, in the eighth technical means, the communication device on the transmission side generates error detection random data generating means for generating error detection random data according to a predetermined rule, and the generated error detection random data. Transmission means for transmitting data and media data in synchronization with each other, and the communication control device generates random data according to the same rules as the error detection random data, and the generated random data Comparison means for comparing the error detection random data from the communication device on the transmission side, and a counting means for counting the number of corresponding bits of the media data synchronized with the error detection random data if both are different by the comparison means, Codec type changing means for changing the codec type according to the count result. It is obtained by said are.

  According to the present invention, the synchronous network and the asynchronous network are operated simultaneously, the error detection random data generated according to a predetermined rule is received from the synchronous network, and the media data synchronized with the error detection random data is received from the asynchronous network. The received error detection random data is compared with the random data generated according to the same rule as that data, and if they are different, the value of the corresponding bit of the media data synchronized with the error detection random data is inverted. Since error correction can be performed, it is possible to reduce the influence of packet errors and jitter (delay fluctuation) that have been a problem in packet communication networks. That is, it is possible to guarantee data quality by error correction and to guarantee real-time performance because processing such as packet retransmission is not performed.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of a communication device of the present invention and a communication system having the communication device will be described with reference to the accompanying drawings. In addition, the same code | symbol is attached | subjected to the part which has the same function, and repeated description is abbreviate | omitted.

  FIG. 1 is a block diagram illustrating a hardware configuration example of a communication apparatus according to an embodiment of the present invention. In the figure, reference numeral 10 denotes a communication device, and the communication device 10 includes an antenna 11, a communication unit 12, a communication control unit 13, a control unit 14, a memory 15, a display unit 16, and an operation unit 17. The communication device 10 transmits and receives media data and the like to and from an information providing server (such as a Web server) or another communication device via an antenna 11. The communication unit 12 demodulates reception data received via the antenna 11 or modulates transmission data to output from the antenna 11. The communication control unit 13 processes each communication protocol of the synchronous network and the asynchronous network (packet line network), and enables the communication unit 12 to transmit and receive data via the synchronous network and the asynchronous network. Note that the media data refers to so-called multimedia data composed of sound, images, text, control data, and the like.

  The control unit 14 includes a CPU (Central Processing Unit), is connected to the above-described units (communication control unit 13, memory 15, display unit 16, and operation unit 17), and stores programs that are means described below in the memory 15. By executing, various functions provided in the communication device 10 are realized. The display unit 16 is a display such as an LCD (Liquid Crystal Display), and can display characters, images, and the like. The operation unit 17 is configured by arranging a plurality of keys for performing various inputs.

  FIG. 2 is a block diagram showing a hardware configuration example of the communication control apparatus according to the present invention. In the figure, reference numeral 20 denotes a communication control apparatus. The communication control apparatus 20 includes a CPU 21 that controls the entire apparatus, a RAM 22 that is a work area for control programs, a ROM 23 that stores control programs and data, a hard disk, and the like. For controlling communication via the synchronous network and the asynchronous network among the storage unit 24, the input unit 25 such as a mouse or keyboard, the display unit 26 such as an LCD (liquid crystal display), and the communication device 10. The control unit 27 includes a CPU 21, a RAM 22, a ROM 23, a storage unit 24, an input unit 25, a display unit 26, and a system bus 29 that connects the communication control unit 27 to each other.

(First embodiment)
FIG. 3 is a block diagram illustrating a configuration example of a communication system including the communication device 10 according to the first embodiment of the present invention. In the figure, reference numeral 30 denotes a line network. The line network 30 includes a synchronous network (private line network) 31 and an asynchronous network (packet line network) 32. In this example, communication processing between the line network 30 and the receiving-side communication device 10 will be described. The communication control device 20 on the transmission side controls the line network 30 composed of the synchronous network 31 and the asynchronous network 32, and communication between the line network 30 and the reception side communication device 10 is possible via the communication path N1. And Although this communication path N1 enables wireless communication or wired communication, an error may occur in data due to the influence of a weak electric field communication environment or the like.

  The communication control device 20 includes error detection random data generation means 20a and transmission means 20b. The error detection random data generating means 20a uses the synchronous network 31 to generate error detection random data according to a predetermined rule. This random data is PN (Pseudo-Random-Noise) series pseudo-random data, and is generated based on a predetermined calculation formula. The transmission means 20b synchronizes the error detection random data generated by the error detection random data generation means 20a and the media data, and transmits them from the synchronous network 31 and the asynchronous network 32, respectively.

  The receiving side communication device 10 includes a receiving means 10a, a random data generating means 10b, a comparing means 10c, and an error bit inverting means 10d. The receiving unit 10a corresponds to the communication unit 12 shown in FIG. 1, receives error detection random data from the synchronous network 31, and receives media data synchronized with the error detection random data from the asynchronous network 32.

  The random data generation means 10b generates random data according to the same rules as the error detection random data. The comparison unit 10c compares the random data generated by the random data generation unit 10b with the error detection random data from the synchronous network 31. The error bit inversion means 10d determines that there is an error in the data when both are different by the comparison means 10c, and inverts the value of the corresponding bit of the media data synchronized with the error detection random data. On the other hand, if they match, it is determined that there is no error in the data, and the media data is left as it is.

  Based on FIG. 3, a specific example of the processing by the random data generation means 10b, the comparison means 10c, and the error bit inversion means 10d will be described below.

  When no data error occurs in the communication path N1, the error detection random data is the same on the transmission side and the reception side. For example, the error detection random data generated on the transmission side is “10101010110” and the media data is “1111111111”. These data are transmitted via the communication path N1 and received on the reception side. Assume that the data is “1010101010” and the media data is “1111111111”.

  The random data generated on the receiving side is “1010101010” because it is calculated by the same calculation formula as the error detection random data. Here, if no data error has occurred in the communication channel N1, the error detection random data is received as “1010101010”, so it matches the random data generated on the receiving side, and it is determined that there is no error in the media data. Is done.

  On the other hand, when a data error occurs in the communication path N1, the error detection random data is different between the transmission side and the reception side. For example, the error detection random data generated on the transmission side is “10101010110” and the media data is “1111111111”. These data are transmitted via the communication path N1 and received on the reception side. It is assumed that the data is “1010111010” and the media data is “1111101111”. Here, since a data error has occurred, the error detection random data on the transmission side is “1010101010” and the reception side is “1010111010”, which is different between the transmission side and the reception side.

  Since the random data generated on the receiving side is “1010101010” as in the case of no data error, the sixth bit does not match when both are compared (“1010111010” and “1010101010”) on the receiving side. I understand. In this case, it is determined that an error has also occurred in the corresponding bit (that is, the sixth bit) of the media data synchronized with the error detection random data.

  From the above, since the value of the 6th bit is incorrect with respect to the media data “1111101111” before error correction on the receiving side, if this is inverted from 0 to 1, it becomes “1111111111”, and the media data on the transmitting side And error correction is performed.

  FIG. 4 is a flowchart for explaining an example of processing in the communication system according to the first embodiment of the present invention. Here, a communication process between the network 30 shown in FIG. 3 and the receiving communication apparatus 10 will be described.

  First, the line network 30 synchronizes the error detection random data generated according to a predetermined calculation formula and the media data according to the control from the communication control device 20, and transmits them from the synchronous network 31 and the asynchronous network 32, respectively ( Step S1). At this time, an error may occur in the data on the communication path N1 from the network 30 to the receiving side communication device 10.

  Next, the receiving-side communication device 10 receives the error detection random data from the synchronous network 31 and the media data from the asynchronous network 32, and generates random data according to the same calculation formula as the error detection random data (step S2). ). The receiving side communication device 10 compares the generated random data with the error detection random data from the synchronous network 31, and checks for errors (step S3).

  Next, the receiving side communication device 10 determines whether or not an error has occurred by comparing the two in step S3 (step S4). If there is a data error (in the case of YES), the receiving side communication device 10 starts from the asynchronous network 32 of the same timing. The corresponding bit of the media data that is the received data is inverted (step S4). In step S4, if there is no data error (in the case of NO), the process is terminated without performing the inversion process.

  FIG. 5 is a block diagram illustrating another configuration example of the communication system including the communication device 10 according to the first embodiment of the present invention. In the figure, the receiving-side communication device 10 includes a counting means 10e, a transmission data amount varying means 10f, and a codec type changing means 10g in addition to the receiving means 10a, the random data generating means 10b, and the comparing means 10c. In this example, both the transmission data amount varying means 10f and the codec type changing means 10g are provided, but a structure provided with either one may be employed.

  The configuration of the communication system shown in FIG. 5 is different from the system configuration shown in FIG. 3 in that it includes a counting unit 10e, a transmission data amount varying unit 10f, and a codec type changing unit 10g instead of the error bit inverting unit 10d. When both data differ by the comparison means 10c, the counting means 10e counts the number of corresponding bits of the media data synchronized with the error detection random data.

  The transmission data amount varying unit 10f varies the transmission data amount according to the count result by the counting unit 10e. That is, when there is an error, it is estimated that low-quality and low-transmission amount data is being used, so that the transmission data amount between the receiving-side communication apparatus 10 and the network 30 is varied to be higher. Note that the count value for changing the transmission data amount can be arbitrarily set. However, for example, if there is one or more error bits, it may be changed. At this time, the receiving-side communication device 10 may include the error bit inversion means 10d and simultaneously perform error correction on the corresponding bits.

  On the other hand, the codec type changing unit 10g changes the codec type according to the count result by the counting unit 10e. That is, when there is an error, it is estimated that a low-quality codec type is being used, so the codec type between the receiving communication apparatus 10 and the network 30 is changed to a higher-quality codec. The count value for changing the type of codec can be arbitrarily set. However, for example, if there is one or more error bits, it may be changed. At this time, the receiving-side communication device 10 may include the error bit inversion means 10d and simultaneously perform error correction on the corresponding bits.

(Second Embodiment)
FIG. 6 is a block diagram illustrating a configuration example of a communication system including the communication device 10 according to the second embodiment of the present invention. In the figure, reference numeral 10 'denotes a transmission side communication apparatus, the transmission side communication apparatus 10' includes an error detection random data generation means 10h and a transmission means 10i, and 20 'denotes a reception side communication control apparatus. The control device 20 'includes a receiving unit 20c, a random data generating unit 20d, a comparing unit 20e, and an error bit inverting unit 20f. In this example, communication processing between the transmission side communication device 10 ′ and the line network 30 and between the line network 30 and the reception side communication device 10 will be described. For the sake of explanation, the communication control device 20 is divided into a reception side and a transmission side, but transmission / reception processing between the network 30 and the communication device 10 may be controlled by a single communication control device.

  The communication control device 20 on the transmission side controls the line network 30 composed of the synchronous network 31 and the asynchronous network 32, and communication between the line network 30 and the reception side communication device 10 is possible via the communication path N1. And The communication path N1 enables wireless communication or wired communication, but an error may occur in data on this path. The communication control device 20 ′ on the receiving side controls the line network 30 including the synchronous network 31 and the asynchronous network 32, and the communication between the transmission side communication device 10 ′ and the line network 30 is performed on the communication path N2. Made possible through. This communication path N2 enables wireless communication or wired communication, but an error may occur in data on this path.

  Since the processing between the network 30 on the receiving side and the receiving side communication device 10 is the same as the processing shown in FIG. 3 or FIG. 5 described above, description thereof is omitted here. Hereinafter, processing between the transmission side communication device 10 ′ and the network 30 on the transmission side will be described.

  The transmission side communication device 10 'includes error detection random data generation means 10h and transmission means 10i. The error detection random data generating means 10h generates error detection random data according to a predetermined rule. This random data is PN (Pseudo-Random-Noise) series pseudo-random data, and is generated based on a predetermined calculation formula. The transmission unit 10i corresponds to the communication unit 12 shown in FIG. 1, and synchronizes the error detection random data generated by the error detection random data generation unit 10h with the media data, so that the synchronous network 31 and the asynchronous network 32 are synchronized. To each.

  The reception-side communication control device 20 ′ includes a reception unit 20c, a random data generation unit 20d, a comparison unit 20e, and an error bit inversion unit 20f. The receiving means 20c receives the error detection random data in the synchronous network 31, and receives the media data synchronized with the error detection random data in the asynchronous network 32.

  The random data generation means 20d generates random data according to the same rules as the error detection random data. The comparison unit 20e compares the random data generated by the random data generation unit 20d with the error detection random data received by the synchronous network 31 (that is, from the transmission side communication device 10 '). The error bit inversion means 20f determines that there is an error when the comparison means 20e differs from each other, and inverts the value of the corresponding bit of the media data synchronized with the error detection random data. On the other hand, if they match, it is determined that there is no error, and the media data is left as it is.

  In this embodiment, instead of the error bit inverting means 20f, the counting means shown in FIG. 5, a transmission data amount varying means, and / or a codec type changing means may be provided. Further, in addition to the error bit inverting means 20f, the counting means shown in FIG. 5, and further the transmission data amount varying means and / or the codec type changing means may be provided.

  7 and 8 are flowcharts for explaining an example of processing in the communication system according to the second embodiment of the present invention. FIG. 8 is a continuation of the flow shown in FIG. Here, communication processing between the transmission side communication device 10 ′ and the line network 30 and between the line network 30 and the reception side communication device 10 shown in FIG. 6 will be described.

  First, the transmission-side communication device 10 ′ synchronizes the error detection random data generated in accordance with a predetermined calculation formula and the media data, and transmits them to the synchronous network 31 and the asynchronous network 32 (step S11). At this time, an error may occur in the data on the communication path N2 from the transmission side communication device 10 ′ to the network 30.

  Next, the reception-side communication control device 20 ′ receives the error detection random data by the synchronous network 31 and the media data by the asynchronous network 32 (step S12). Random data is generated according to the same calculation formula as the data (step S13). The reception side communication control device 20 ′ compares the random data generated by the synchronous network 31 with the error detection random data from the transmission side communication device 10 ′, and checks for errors (step S14).

  Next, the reception-side communication control device 20 ′ determines whether an error has occurred by comparing the two in step S14 (step S15). If there is a data error (in the case of YES), the asynchronous network having the same timing is determined. The corresponding bit of the media data which is the 32 received data is inverted (step S16), and the process proceeds to step S17. In step S15, if there is no data error (NO), the process proceeds to step S17 without performing the inversion process.

  Then, the line network 30 synchronizes the error detection random data generated according to a predetermined calculation formula and the media data according to the control from the communication control device 20, and transmits them from the synchronous network 31 and the asynchronous network 32, respectively (step). S17). At this time, an error may occur in the data on the communication path N1 from the network 30 to the receiving side communication device 10.

  Next, the receiving-side communication device 10 receives the error detection random data from the synchronous network 31 and the media data from the asynchronous network 32, and generates random data according to the same calculation formula as the error detection random data (step S18). ). The receiving-side communication device 10 compares the random data generated in step S18 with the error detection random data from the synchronous network 31, and checks for errors (step S19).

  Next, the receiving side communication device 10 determines whether or not an error has occurred by comparing both in step S19 (step S20). If there is a data error (in the case of YES), the receiving side communication device 10 starts from the asynchronous network 32 of the same timing. The corresponding bit of the media data which is the received data is inverted (step S21). In step S20, when there is no data error (in the case of NO), the process is terminated without performing the inversion process.

  As described above, according to the present invention, the synchronous network and the asynchronous network are operated simultaneously, the error detection random data generated according to a predetermined rule is received from the synchronous network, and the error detection random data is received from the asynchronous network. If the received error detection random data is compared with the random data generated according to the same rules as the received data, if the two are different, the corresponding bit of the media data synchronized with the error detection random data Therefore, it is possible to reduce the influence of packet errors and jitter (delay fluctuation), which are problems in the packet communication network. That is, it is possible to guarantee data quality by error correction and to guarantee real-time performance because processing such as packet retransmission is not performed.

It is a block diagram which shows the structural example of the hardware of the communication apparatus which concerns on one Embodiment of this invention. It is a block diagram which shows the structural example of the hardware of the communication control apparatus which concerns on this invention. It is a block diagram which shows the structural example of the communication system which has a communication apparatus which concerns on the 1st Embodiment of this invention. It is a flowchart for demonstrating an example of the process in the communication system which concerns on the 1st Embodiment of this invention. It is a block diagram which shows the other structural example of the communication system which has a communication apparatus which concerns on the 1st Embodiment of this invention. It is a block diagram which shows the structural example of the communication system which has a communication apparatus which concerns on the 2nd Embodiment of this invention. It is a flowchart for demonstrating an example of the process in the communication system which concerns on the 2nd Embodiment of this invention. FIG. 10 is a flowchart for explaining an example of processing in the communication system according to the second embodiment of the present invention, and is a continuation of the flow shown in FIG. 7. It is a block diagram which shows the structure of the conventional communication system. It is a flowchart for demonstrating an example of the process in the conventional communication system. It is a flowchart for demonstrating the other example of the process in the conventional communication system.

Explanation of symbols

10, 10 ', 100, 100' ... communication device, 10a, 20c ... receiving means, 10b, 20d ... random data generating means, 10c, 20e ... comparing means, 10d, 20f ... error bit inversion means, 10e ... counting means, 10f: Transmission data amount varying means, 10g: Codec type changing means, 11 ... Antenna, 12 ... Communication unit, 13, 27 ... Communication control unit, 14 ... Control unit, 15 ... Memory, 16, 26 ... Display unit, 17 ... Operation unit 20, 20 '... communication control device, 20a, 10h ... error detection random data generation means, 20b, 10i ... transmission means, 21 ... CPU, 22 ... RAM, 23 ... ROM, 24 ... storage section, 25 ... Input unit, 28... System bus, 30, 200... Network, 31... Synchronous network (private network), 32, 201 .. asynchronous network (packet network).

Claims (9)

In a communication device that performs data communication via a network composed of a synchronous network and an asynchronous network,
Receiving means for receiving random data for error detection generated according to a predetermined rule from the synchronous network, and receiving media data synchronized with the random data for error detection from the asynchronous network;
Random data generating means for generating random data according to the same rules as the error detection random data;
A comparison means for comparing the generated random data with the error detection random data from the synchronous network;
An error bit inversion means for inverting the value of the corresponding bit of the media data synchronized with the error detection random data when both are different by the comparison means. In a communication device that performs data communication via a network composed of a synchronous network and an asynchronous network,
Receiving means for receiving random data for error detection generated according to a predetermined rule from the synchronous network, and receiving media data synchronized with the random data for error detection from the asynchronous network;
Random data generating means for generating random data according to the same rules as the error detection random data;
A comparison means for comparing the generated random data with the error detection random data from the synchronous network;
If both are different by the comparison means, the counting means for counting the number of corresponding bits of the media data synchronized with the error detection random data;
A communication apparatus comprising: a transmission data amount varying means for varying a transmission data amount according to the count result. In a communication device that performs data communication via a network composed of a synchronous network and an asynchronous network,
Receiving means for receiving random data for error detection generated according to a predetermined rule from the synchronous network, and receiving media data synchronized with the random data for error detection from the asynchronous network;
Random data generating means for generating random data according to the same rules as the error detection random data;
A comparison means for comparing the generated random data with the error detection random data from the synchronous network;
If both are different by the comparison means, the counting means for counting the number of corresponding bits of the media data synchronized with the error detection random data;
A communication apparatus comprising codec type changing means for changing a codec type according to the count result. In a communication system having a communication control device that controls a line network composed of a synchronous network and an asynchronous network, and a communication device that performs data communication via the line network,
The communication control device comprises: error detection random data generating means for generating error detection random data according to a predetermined rule;
Transmission means for synchronizing the generated error detection random data and media data to be transmitted from the synchronous network and the asynchronous network, respectively.
The communication device comprises random data generating means for generating random data according to the same rules as the error detection random data;
A comparison means for comparing the generated random data with the error detection random data from the synchronous network;
A communication system comprising: error bit inversion means for inverting the value of a corresponding bit of media data synchronized with the error detection random data when both are different by the comparison means. The communication system according to claim 4,
The communication device on the transmission side includes error detection random data generating means for generating error detection random data according to a predetermined rule;
Transmission means for transmitting the generated error detection random data and media data in synchronization with each other,
The communication control device, random data generating means for generating random data according to the same rules as the error detection random data,
Comparison means for comparing the generated random data with the error detection random data from the transmission side communication device;
A communication system comprising: error bit inversion means for inverting the value of a corresponding bit of media data synchronized with the error detection random data when both are different by the comparison means. In a communication system having a communication control device that controls a line network composed of a synchronous network and an asynchronous network, and a communication device that performs data communication via the line network,
The communication control device comprises: error detection random data generating means for generating error detection random data according to a predetermined rule;
Transmission means for synchronizing the generated error detection random data and media data to be transmitted from the synchronous network and the asynchronous network, respectively.
The communication device comprises random data generating means for generating random data according to the same rules as the error detection random data;
A comparison means for comparing the generated random data with the error detection random data from the synchronous network;
If both are different by the comparison means, the counting means for counting the number of corresponding bits of the media data synchronized with the error detection random data;
A communication system comprising: a transmission data amount varying means for varying a transmission data amount according to the count result. The communication system according to claim 6,
The communication device on the transmission side includes error detection random data generating means for generating error detection random data according to a predetermined rule;
Transmission means for transmitting the generated error detection random data and media data in synchronization with each other,
The communication control device, random data generating means for generating random data according to the same rules as the error detection random data,
Comparison means for comparing the generated random data with the error detection random data from the transmission side communication device;
If both are different by the comparison means, the counting means for counting the number of corresponding bits of the media data synchronized with the error detection random data;
A communication system comprising: a transmission data amount varying means for varying a transmission data amount according to the count result. In a communication system having a communication control device that controls a line network composed of a synchronous network and an asynchronous network, and a communication device that performs data communication via the line network,
The communication control device comprises: error detection random data generating means for generating error detection random data according to a predetermined rule;
Transmission means for synchronizing the generated error detection random data and media data to be transmitted from the synchronous network and the asynchronous network, respectively.
The communication device comprises random data generating means for generating random data according to the same rules as the error detection random data;
A comparison means for comparing the generated random data with the error detection random data from the synchronous network;
If both are different by the comparison means, the counting means for counting the number of corresponding bits of the media data synchronized with the error detection random data;
A communication system comprising: a codec type changing means for changing a codec type according to the count result. The communication system according to claim 8,
The communication device on the transmission side includes error detection random data generating means for generating error detection random data according to a predetermined rule;
Transmission means for transmitting the generated error detection random data and media data in synchronization with each other,
The communication control device, random data generating means for generating random data according to the same rules as the error detection random data,
Comparison means for comparing the generated random data with the error detection random data from the transmission side communication device;
If both are different by the comparison means, the counting means for counting the number of corresponding bits of the media data synchronized with the error detection random data;
A communication system comprising: a codec type changing means for changing a codec type according to the count result.

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