WO2002080562A1 - Dispositif de communication multimedia - Google Patents

Dispositif de communication multimedia Download PDF

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Publication number
WO2002080562A1
WO2002080562A1 PCT/JP2001/005593 JP0105593W WO02080562A1 WO 2002080562 A1 WO2002080562 A1 WO 2002080562A1 JP 0105593 W JP0105593 W JP 0105593W WO 02080562 A1 WO02080562 A1 WO 02080562A1
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WIPO (PCT)
Prior art keywords
encoding
data
coding
information
decoding
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PCT/JP2001/005593
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English (en)
Japanese (ja)
Inventor
Midori Ono
Original Assignee
Mitsubishi Denki Kabushiki Kaisha
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Publication of WO2002080562A1 publication Critical patent/WO2002080562A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/24—Systems for the transmission of television signals using pulse code modulation
    • H04N7/52—Systems for transmission of a pulse code modulated video signal with one or more other pulse code modulated signals, e.g. an audio signal or a synchronizing signal

Definitions

  • the present invention relates to a multimedia communication device capable of transmitting and receiving moving images and sounds.
  • a conventional multimedia communication device exchanges information with a partner terminal device at the start of a call, and the coding type such as video is basically fixed during a call.
  • a method of transmitting and receiving a video coded according to the fixed coding type is adopted.
  • the encoding type defines the internal format of data encoded by, for example, MPEG-4, H261, H'263, etc., and the functions used in encoding.
  • the transmitting side can freely determine the parameters used for encoding. For example, the transmission period of an intra-frame coded image described in Japanese Patent Application Laid-Open No. 2000-23015 / the quantization characteristic described in Japanese Patent Application Laid-Open No. 8-213139 is The sending terminal can be changed freely.
  • FIG. 1 is a block diagram showing a configuration of a conventional multimedia communication device described in Japanese Patent Application Laid-Open No. 2000-231354.
  • reference numeral 51 denotes a system control unit.
  • 52 A is the video encoder 1
  • 52 B is the video encoder 2
  • 52 C is the video encoder 3
  • 53 is the encoded data output selector.
  • 54 is an input terminal
  • 55 is an output terminal.
  • the system control unit 51 sets the encoding parameters in the moving image encoding units 1 (52A), 2 (52B), and 3 (52C) that operate in parallel.
  • the moving picture coding unit 1 (52A) is set to perform coding with the period of the intra-frame coded picture (I picture) as 3
  • the moving picture coding unit 2 (52B) It is set so that encoding is performed with the period of the intra-frame coded image (I-picture) as 2
  • the video encoding unit 3 (52C) performs encoding with the period of the intra-frame coded image (I-picture) as 1.
  • the system control unit 51 is set to perform encoding, and the moving image input from the input terminal 54 is encoded in parallel by each moving image encoding unit, and the encoding from each moving image encoding unit is performed.
  • the optimal coding parameters are determined at certain intervals while evaluating the data representing the obtained image quality, and the encoding is performed so as to select the encoded output data corresponding to the optimal coding parameters. Controls the data output selector 53.
  • the encoding type and the encoding parameters relating to the entire encoding process cannot be changed immediately during a call. For example, if an H324 terminal tries to change the encoding type or the encoding parameters for the entire code during a call, the H324 protocol message is used to obtain the permission of the receiving terminal. After that, it becomes possible to transmit video data in a new encoding type. When returning to the coding type before the change, it is necessary to obtain permission of the partner terminal device using the H245 protocol message in the same manner. For this reason, a time lag occurs between when the protocol message is transmitted from the own terminal device and arrives at the partner terminal device, and when the response is transmitted from the partner terminal device and received by the own terminal device.
  • a video encoding method generally employs a method of encoding a difference between a previously transmitted image and a current image in order to increase transmission efficiency.
  • a method for encoding the difference is also used for voice.
  • the coding efficiency is generally high when the input image has many still parts, but the image quality deteriorates or the coding efficiency deteriorates when the input image has many moving images. And other phenomena.
  • the appearance of these phenomena varies depending on the type of encoding and the parameters at the time of encoding. If the optimal encoding method can be selected at the time of transmission, better image quality in a limited transmission amount range Should be obtained.
  • the present invention has been made in order to solve the above-described problem, and has been made by switching the encoding method for each screen using a protocol message. It is another object of the present invention to provide a multimedia communication apparatus that can select an optimal coding method at the time of transmission and can obtain better image quality within a limited transmission amount.
  • a multimedia communication apparatus includes: a plurality of encoding means for encoding the same moving image; and one of encoded data output from the encoding means selected as a selected encoded data. And transmission data generating means for generating a video data composed of information on the encoding of the selected coded data and the selected coded data.
  • the information on the encoding of the selected encoded data is obtained from encoding method information representing the encoding method and encoded parameter information representing the encoding parameter.
  • the transmission data generation means includes: coding method information indicating the coding method of the selected coded data, coding parameter information indicating the coded parameters, and the selected coded data. And a notifying unit for generating video data composed of the following.
  • the information on the encoding of the selected encoded data is composed of type number information indicating an encoding method and a type number assigned to the encoded parameter.
  • the data generation means includes: a coding method notification means for assigning a type number to the coding method and the coding parameters; and a coding method and coding parameters used for coding the selected coded data. And a type number notifying means for generating video data including type number information indicating the allocated type number and the selected coded data.
  • the encoding method information and the encoding parameter information are added to the head of the selected encoded data.
  • the partner terminal device can decode the encoded data before decoding it. It is possible to obtain information on coding and receive encoded data with optimum image quality.
  • the type number information is added to the head of the selected encoded data.
  • the partner terminal apparatus can obtain information about the coding before decoding the coded data and receive the coded data with the optimum image quality.
  • a multimedia communication device includes: a plurality of decoding units for decoding encoded data; and a plurality of decoding units according to information on encoding of video data received from a partner terminal device. And receiving data analysis means for selecting and transmitting the encoded data of the video data to the selected decoding means.
  • the information on encoding is composed of encoding method information indicating an encoding method and encoding parameter information indicating an encoding parameter
  • the reception data analyzing means includes: It comprises a decoding type selection means for selecting a decoding means according to the data encoding method and the encoding parameters.
  • the information on encoding includes type number information indicating a type number corresponding to an encoding method and an encoding parameter, and the reception data analyzing means determines that communication has started.
  • the encoding method received from the partner terminal device the encoding method based on the encoding parameters and the type number Decoding setting means for storing information indicating the correspondence between the expression and the encoding parameter and the type number, and using the type number information of the video data for decoding by collating with the information indicating the correspondence stored in the decoding setting means
  • decoding number selecting means for selecting decoding means to be decoded.
  • the video data is composed of encoded data, encoding method information and encoded parameter information added to the head of the encoded data.
  • the video data includes encoded data and type number information added to the head of the encoded data.
  • FIG. 1 is a block diagram showing a configuration of a conventional multimedia communication device.
  • FIG. 2 is a block diagram showing a configuration of the multimedia communication terminal device according to the first embodiment of the present invention.
  • FIG. 3 shows a video according to the first and third embodiments of the present invention. It is a data block diagram.
  • FIG. 4 is a block diagram showing a configuration of a multimedia communication terminal device according to Embodiment 2 of the present invention.
  • FIG. 5 is a configuration diagram of the video data according to the second and fourth embodiments of the present invention.
  • FIG. 6 is a block diagram showing a configuration of a multimedia communication terminal device according to Embodiment 3 of the present invention.
  • FIG. 7 is a block diagram showing a configuration of a multimedia communication terminal device according to Embodiment 4 of the present invention.
  • FIG. 2 is a block diagram showing a configuration of the multimedia communication terminal device according to the first embodiment of the present invention.
  • reference numeral 1 denotes a CCD camera as a video input means for capturing a video and generating a video signal 30, and 10, 11, and 12 encode the video signal 30 and generate encoded data.
  • a video (moving image) encoding means for generating 104a, 104b, and 104c, for example, 10 is an encoding means for encoding by the H263 encoding method;
  • Reference numeral 1 denotes an encoding unit that performs encoding by using the MPEG-4 Visua 1 encoding system, and 12 denotes an encoding unit that performs encoding by using the H 2 62 encoding system.
  • Reference numeral 14 denotes transmission data selection means for selecting the coded data and outputting the selected coded data 104 and the selection result 33, and 15 denotes the selected coded data 1
  • Transmission data generation means for generating video data 16 based on 0 4 and selection result 3 3
  • 16 is coded data 104 and selection result 3 3 is a video data generated on the basis of 3
  • 17 is a data type notifying means constituting the transmission data overnight generating means 15
  • 2 is a microphone which takes in audio and generates an audio signal 3 2
  • Reference numeral 13 denotes an audio encoding means to be encoded by the GSM encoding method.
  • Reference numeral 18 denotes a multimedia communication control protocol for notifying the transmission of voice and video with the partner terminal and determining the multiplexing parameters
  • 3 is a communication that operates the multimedia communication control protocol 18 to perform communication.
  • a terminal control unit for starting the start procedure, 19 is a media demultiplexer for setting the determined multiplexing parameters.
  • the transmission data generating means 15 is constituted by the data type notifying means 17.
  • FIG. 3 is a diagram showing the configuration of the video server 16.
  • 101 is encoding method information (1 byte) indicating the encoding method
  • 102 is encoding parameter information (2 knots) indicating the encoding parameter.
  • Yes 104 is the encoded data (n bytes).
  • the encoding method information 101 and the encoding parameter information 102 become information relating to encoding in the first embodiment and the third embodiment described later.
  • Encoding method information 101 is a one-byte data, and represents a number indicating a video encoding method. For example, if ITU-TH2661, the number indicating the coding method is 0, if ITU-TH2662, the number indicating the coding method is 1, and if ITU-TH263, the number indicating the coding method is 1. If there is, the number indicating the encoding method is 2.
  • the code parameter information 102 is a 2-byte data, and represents the coding parameters related to the entire coding process. The content of this parameter depends on the encoding method.For example, in H263, it is determined whether there is a restriction on the length of the motion compensation vector used in differential encoding, and whether or not to use arithmetic encoding. It is indicated by setting the value of a specific bit to 0 or 1.
  • the coded data 104 is an output coded by the coding means 10, 11, and 12 using the coding method indicated by the coding method information 101 and the coding parameter information 102. This is the encoding of the image of one screen of video (n bytes).
  • the terminal control unit 3 When the communication line 50 is opened and digital data can be transmitted (arrow (1) in FIG. 2), the terminal control unit 3 operates the multimedia communication control protocol 18 to start a communication start procedure.
  • the multimedia communication control protocol 18 notifies the transmission of voice and video with the partner terminal, and determines the multiplexing parameters.
  • the determined multiplexing parameters are set in the media multiplexing / demultiplexing unit 19 by the terminal control unit 3 as setting contents (arrow (2) in FIG. 2). At this time, a specific coding method is not determined between the terminal and the partner terminal.
  • the media demultiplexer 19 When the multiplexing parameter is set, the media demultiplexer 19 is ready to transmit audio and video. When transmission becomes possible, data is requested from the source of each media (audio and video) (arrow (3) in Fig. 2), and the obtained data is multiplexed and transmitted.
  • the source of the audio is the encoding unit 13
  • the source of the video is the data type notifying unit 17 of the transmission data generating unit 15.
  • the data type notifying means 17 of the transmitting data generating means 15 requests the data from the transmitting data selecting means 14 in response to the data request from the media multiplexing / demultiplexing 19 (arrow (4) in FIG. 2). ), To obtain the encoded data 104 and the selection result 33.
  • the data type notifying means 17 forms the video data 16 according to the obtained selection result 33 and passes it to the media demultiplexer 19.
  • the composed video data 16 is encoded data as shown in FIG. It represents the encoding method information that indicates the encoding method added before the encoding data (104 bytes (n bytes) and 104), and represents the encoding parameters (1 byte) and the encoding parameters. It consists of encoded parameter overnight information 102 (2 notes).
  • the information indicating the encoding method and the encoding parameters of the received encoded data represents the encoded data is added to the head as information relating to encoding.
  • the encoding method and the encoding parameter represented by the encoding method information 101 and the encoding parameter information 102 are encoding means in which the selected encoding data 10 is encoded.
  • the encoding method and the encoding parameters are added before the encoding data 104 based on the selection result 33 generated by the transmission data selecting means 14.
  • the transmission data selection means 14 sends data to the encoding means 10, the encoding means 11, and the encoding means 12 in response to a data request from the data type notifying means 17 of the transmission data generating means 15. 'Request (arrow (5) in Figure 2).
  • the transmission data selection means 14 obtains the encoded data 104 a, 104 b, and 104 c from the three coding means 10, 11, and 12.
  • One of the encoded data is selected, and the selected result 33 and the selected encoded data 104 are sent to the data type notifying means 17 of the transmission data generating means 15.
  • the selection result 33 is information for specifying the encoding unit that has generated the selected encoded data 104, and may be, for example, a number representing the encoding unit.
  • the encoding means 10, 11, and 12 respectively perform video encoding processing on the video signal 30 from the CCD camera 1 to encode data 10 4 a, 10 4 b, and 10 4. c, and generates the encoded data 104a, 104b, and 104b according to the request of the transmission data selection means 14 (arrow (5) in FIG. 2). Pass c to transmission means overnight selection means 14.
  • the audio captured by the microphone 2 is input to the encoding means 13 as an audio signal 32.
  • the encoding means 13 encodes the audio signal 32 according to the GSM method to generate an encoded data 105.
  • the encoded data 105 is input to the demultiplexer 19.
  • the media demultiplexer 19 multiplexes the input coded audio data 105 and video data 16 and transmits the multiplexed data to the partner terminal device via the communication line 50.
  • encoding is performed using different encoding methods and encoding parameters using a plurality of encoding means, and one of the Coded data coded by the coding means is selected, and the coding system and coding parameters of the selected coded data are added to the head of the coded data as coding information. Therefore, it is possible to obtain the effect that the encoded data can be transmitted to the partner terminal device with the optimal image quality at the time of transmission.
  • the encoding method information and the encoding parameter information indicating the encoding method and the encoding parameter of the selected encoded data is added to the head of the coded data, so that the other terminal device can obtain the information on the coding before decoding the coded data and receive the coded data with the optimum image quality. Fruit is obtained.
  • FIG. 4 is a block diagram showing a configuration of a multimedia communication terminal device according to Embodiment 2 of the present invention. Since the same reference numerals as those in FIG. 2 indicate the same or corresponding parts, the description is omitted.
  • reference numeral 201 denotes an encoding means of encoding means 10, 11, and 12, and a series of encoding parameters and a type number are stored in association with each other, and a multimedia communication control protocol 1 is stored.
  • 8 is a coding method notifying means for transmitting the coding method, the coding parameters and the type number of each coding means to the other terminal device via the communication device 8.
  • Reference numeral 202 denotes a type number notifying means for generating a video data 16 based on the coded data 104 and the selection result 33, and the coding method and code stored in the coding method notifying means 201. The correspondence between the parameterized parameter and the type number is also stored in the type number notification means 202.
  • the encoding method notifying means 201 and the type number notifying means 202 constitute the transmission data generating means 15.
  • FIG. 5 is a diagram showing a configuration of the video data 16 of FIG.
  • reference numeral 310 denotes type number information (1 byte)
  • reference numeral 104 denotes encoded data (n bytes) as in the video data 16 of the first embodiment shown in FIG. is there.
  • the type number information 301 corresponds to the encoding method represented by the encoding method information 101 in FIG. 3 and the encoding parameter information represented by the encoding parameter information 102. This corresponds to encoding information in the second embodiment and the fourth embodiment described later.
  • the type number information 301 indicates the type number in the correspondence between the encoding method and the encoding parameter stored in the encoding method notifying means 201 and the type number notifying means 202 and the type number. Represents.
  • the transmission data overnight generating means 15 That the type number notifying means 202 and the encoding method notifying means 201, and that the video data 16 consist of the type number information 301 and the encoded data 104 Since it is the same as the first embodiment except for the difference from the first embodiment, the following mainly describes differences in operation based on this difference.
  • the communication line 50 is opened and transmission of digital data is enabled (arrow (1) in FIG. 4), and the multiplexing parameter is determined. (Arrow (2) in FIG. 4), and audio and video can be transmitted.
  • the encoding method notification means 201 when transmission becomes possible, sends the encoding means 10, 11, and 12 via the multimedia communication control protocol 18.
  • the correspondence between the encoding method and the encoding parameters and the assigned type number is transmitted to the partner terminal device (arrow (6) in FIG. 4).
  • the media demultiplexer 19 transmits the data to the transmission source of each media (audio and video). A request is made (arrow (3) in FIG. 4), and the obtained data is multiplexed and transmitted.
  • the source of the audio is the encoding unit 13
  • the source of the video is the data type notifying unit 17 of the transmission data generating unit 15.
  • the type number notification means 202 of the transmission data generation means 15 requests data from the transmission data selection means 14 in response to a data request from the media multiplexing / demultiplexing device 19 (arrow (4) in FIG. 4). )), And obtain the encoded data 104 and the selection result 33.
  • the type number notifying means 1 ⁇ composes the video data 16 according to the obtained selection result 33 and passes it to the media demultiplexer 19.
  • the generated video data 16 includes encoded data 104 and type number information 301 added before the encoded data 104. . That is, type number information 310 representing the encoding method and the type number corresponding to the encoding parameter of the selected encoded data 104 is added to the beginning of the encoded data 104.
  • the type number represented by the type number information 301 is the type number assigned to the encoding method and the encoding parameter of the encoding means in which the selected encoded data 104 has been encoded, and transmitted. Based on the selection result 33 generated by the data selection means 14, the transmission data selection means 14 added before the encoded data 104 is composed of: and the encoding means 10, 11, and Since the operation of 12 is the same as that of the first embodiment, the description is omitted.
  • the operation related to audio is also the same as in the first embodiment, and a description thereof will be omitted.
  • the encoding method of the selected encoded data and the type number information indicating the type number corresponding to the encoding parameter are used as the information related to the encoding. Since the function is added at the beginning, the same function as in the first embodiment can be realized with a reduced load during a call.
  • type number information indicating a type number corresponding to the selected encoding method and the encoding parameter is encoded data. Therefore, the other terminal can obtain the information on the encoding before decoding the encoded data and receive the encoded data with the optimum image quality.
  • Embodiment 2 three encoding means are used for video. Although the description has been given of the case of using at the same time, the same processing can be performed by using two encoding units or four or more encoding units at the same time. In addition, the same processing as video can be performed on audio using multiple encoding means.
  • FIG. 6 is a block diagram showing a configuration of a multimedia communication terminal device according to Embodiment 3 of the present invention.
  • 3 15 receives video data 16 and sends the encoded data 104 of the video data 16 to the decoding means for the corresponding encoding method and encoding parameter.
  • Decoding type selecting means 314 is a received data analyzing means comprising decoding type selecting means 315.
  • Reference numerals 310, 311 and 312 denote video decoding means for decoding the coded data sent from the decoding type selecting means 315 of the received data analyzing means 314.
  • 0 is a decoding means for decoding in the H266 encoding method
  • 311 is a decoding means for decoding in the MPEG-4 visual coding method
  • 312 is an H266 encoding method. Is decoding means for decoding.
  • Reference numeral 313 denotes audio decoding means for decoding encoded audio data transmitted from the media demultiplexer 19.
  • Reference numeral 320 denotes a monitor for displaying the decoded video.
  • 3 2 1 is the speed at which the decoded sound is pronounced.
  • the received data analysis means 314 comprises decoding type selection means 315.
  • the terminal control unit 3 sets the multimedia communication control protocol 1 Operate 8 to start the communication start procedure.
  • the multimedia communication control protocol 18 notifies voice and video transmission to and from the partner terminal and determines the separation parameters.
  • the determined separation parameters are set to the media multiplex separation 19 by the terminal control unit 3 as setting contents (arrow (2) in FIG. 6). No specific coding scheme is determined with the partner terminal.
  • the media demultiplexer 19 sets the demultiplexing parameter to be receivable and, when receiving the demultiplexing from the partner terminal via the communication line 50, separates the video or audio demultiplexing. Pass the data to the destination of each media (arrow (3) in Fig. 6).
  • the audio receiving destination is the decoding means 3 13
  • the video receiving destination is the decoding type selecting means 3 15 of the received data analyzing means 3 14. .
  • the decoding type selection means 3 15 of the received data analysis means 3 14 determines the encoding method and the changing parameter of the video data 16 passed from the media multiplex separation 19 and performs the corresponding decoding. Pass the encoded data 104 to any of the means 310, 311 and 312 (arrow (4) in FIG. 6).
  • the video data 16 passed from the media demultiplexer 19 is, as shown in FIG. 3, the encoded data 104 (n bytes) and the encoded data 104 before the encoded data 104. It consists of coding method information 101 (1 byte) indicating the coding method and coding parameter information 102 (2 bytes) indicating the coding parameter added to. That is, information indicating the received encoding scheme and encoding parameters is added to the beginning of the encoding scheme.
  • the decoding type selection means 3 15 of the reception data analysis means 3 14 uses the coding method information 101 and the coding parameter information 102 of the video data 16 as information relating to coding, and Decoding means for decoding the encoded data 104 of the video data 16 based on the information on The encoded data 104 is passed to the decoding means.
  • '' Encoding which is selected by decoding type selection means 3 15 of received data analysis means 3 14 among decoding means 3 10, 3 1 1 and 3 1 2
  • the means decodes the passed encoded data 104 and causes the monitor 320 to display an image.
  • the data demultiplexed by the media demultiplexer 19 is a video data — the video 16.
  • the data demultiplexed by the media demultiplexer 19 is the audio data
  • the sound is sent to the decoding means 3 13, and the decoded sound is emitted through the speaker 3 21.
  • the coding method represented by coding method information 101 and coding parameter information 102 which is information related to coding of video data 16
  • decoding means for decoding the encoded data of the video data 16 based on the encoding parameters and the encoding parameters, the video data 16 encoded by a plurality of encoding methods are selected. This provides the effect of decoding and displaying in real time.
  • FIG. 7 is a block diagram showing a configuration of a multimedia communication terminal device according to Embodiment 4 of the present invention.
  • the same reference numerals as those in FIGS. 2 and 6 denote the same or corresponding parts, and a description thereof will be omitted.
  • Figure 7
  • 33 0 is a decoding setting means for storing the encoding method and the encoding parameters received from the multimedia communication control protocol 18 and the corresponding type number
  • 3 3 1 is decoding setting means 3 3 0
  • Decoding number selection means for selecting the encoded data 104 of the video data 16 received from 19 and passing it to the decoding means.
  • the decryption setting means 330 and the decryption number selecting means 331 constitute the reception data analyzing means 314. Next, the operation will be described.
  • the configuration of the fourth embodiment is the same as that of the third embodiment except that the received data analyzing means 3 14 includes a decoding number selecting means 331 and a decoding setting means 3330. Therefore, the following description focuses on differences in operation due to this difference in configuration.
  • the multimedia communication control protocol 18 When the communication line 50 is opened and the transmission of digital data becomes possible (arrow (1) in FIG. 7), the multimedia communication control protocol 18 notifies the other terminal of the transmission of audio and video. Is performed.
  • the separation parameter is determined and the set content is set to the media multiplex / demultiplex 19 by the terminal control unit 3 (arrow (2) in FIG. 7)
  • the media multiplex / demultiplex 19 becomes a receivable state.
  • Information indicating the correspondence between the encoding method and the encoding parameters transmitted from the partner terminal and the assigned type number is transferred to the multimedia communication control protocol 18 via the media multiplex / demultiplex 19.
  • ⁇ 8 is the coding method and coding Information indicating the correspondence between the lame and the assigned type number is passed to the decryption setting means 330 of the reception data analyzing means 314 (arrow (6) in FIG. 6).
  • the decoding setting means 330 stores information indicating the correspondence between the encoding method and the encoding parameter and the assigned type number.
  • the media multiplex / demultiplex 19 when the information indicating the correspondence between the encoding method and the encoding parameter and the assigned type number is stored in the decoding setting means 330, performs the video or audio decoding. And pass the data to the destination of each media (arrow (3) in Fig. 7).
  • the decoding number selecting means 3 3 1 of the receiving data overnight analyzing means 3 1 4 sends the type number information 3 0 1 of the video data 16 passed from the media multiplex separation 19 and the decoding setting means 3 3 0 to
  • the stored coding method and the coding parameter are compared with the information indicating the correspondence between the assigned type number and the coding method in which the coded data 104 of the video data 16 is coded.
  • the encoding parameter is determined, and the encoded data 104 is passed to any of the corresponding decoding means 310, 311 and 312 (arrow (4) in FIG. 7).
  • the video data 16 passed from the media demultiplexer 19 is composed of encoded data 104 (n bytes) and encoded data 104 It consists of type number information 3 0 1 (1 note) that indicates the type number added to. That is, the type number information 301 representing the received type number is added to the beginning of the encoded data 104.
  • the decoding type selection means 3 15 of the received data analysis means 3 14 uses the type number information 3 0 1 of the video data 16 as information relating to the encoding, and sends the information relating to this encoding to the decoding setting means 3 3 0.
  • Decoding means for decoding the encoded data 104 of the video data 16 is selected by comparing the stored encoding method and information indicating the correspondence between the encoding parameters and the assigned type numbers, Pass the encoded data 10.4 to the selected decoding means.
  • the operations of the decoding means 310, 311 and 312, and the monitor 320 are the same as those of the third embodiment, and therefore the description thereof is omitted. Also in the fourth embodiment, if the data separated by the media demultiplexer 19 is audio data, the audio data is sent to the decoding means 3 13, and the decoded audio is sent to the speaker 3 2 1 Pronounced through
  • a decoding unit to be used for decoding is selected based on the type number represented by the type number information 301 as information relating to encoding of the video data 16
  • video data 16 encoded by a plurality of encoding schemes can be decoded and displayed in real time with a lower communication load than in the third embodiment.
  • the type number information indicating the type of encoding corresponding to the encoding method and encoding parameters of the received encoded data is added to the beginning of the encoded data.
  • the multimedia communication device is suitable for obtaining better image quality within a limited transmission amount range in transmitting and receiving moving images and sounds.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Compression Or Coding Systems Of Tv Signals (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)

Abstract

L'invention concerne un dispositif de communication multimédia comprenant une pluralité de dispositifs de codage (10, 11, 12, 13), un dispositif de sélection de données de transmission servant à sélectionner une donnée à transmettre parmi les données codées (104) engendrées par ledit dispositif de codage, et un dispositif de génération de données (15) servant à produire des données vidéo (16) qui englobent les données codées sélectionnées (104) et l'information de codage (101, 102 ou 301) dans les données codées (104) sélectionnées par le dispositif de sélection de données (14).
PCT/JP2001/005593 2001-03-28 2001-06-28 Dispositif de communication multimedia WO2002080562A1 (fr)

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JP2001093646A JP2002290973A (ja) 2001-03-28 2001-03-28 マルチメディア通信装置

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110381320A (zh) * 2019-07-25 2019-10-25 深圳市玩视科技有限公司 信号传输系统、信号编解码方法及装置

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4447197B2 (ja) * 2002-01-07 2010-04-07 三菱電機株式会社 動画像符号化装置および動画像復号装置
WO2005074291A1 (fr) 2004-01-28 2005-08-11 Nec Corporation Procédé, dispositif et système de codage, de diffusion et de réception de contenu, et programme
CN1947407A (zh) * 2004-04-09 2007-04-11 日本电气株式会社 音频通信方法和装置
WO2006025489A1 (fr) * 2004-09-01 2006-03-09 Matsushita Electric Industrial Co., Ltd. Procédé de reproduction d’image et dispositif de reproduction d’image
KR101215615B1 (ko) * 2006-01-10 2012-12-26 삼성전자주식회사 동일 채널 내에서 서로 다른 코덱을 이용하여 부호화된 비디오 및 오디오 데이터 스트림의 재생을 위한 코덱 변경 방법 및 장치
JP4736877B2 (ja) * 2006-03-16 2011-07-27 日本電気株式会社 多重分離装置および多重分離方法
CN101615910B (zh) * 2009-05-31 2010-12-22 华为技术有限公司 压缩编码的方法、装置和设备以及压缩解码方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0646404A (ja) * 1992-03-17 1994-02-18 Sony Corp 画像データ処理装置及び画像データ処理方法
JPH06303438A (ja) * 1993-04-19 1994-10-28 Matsushita Electric Ind Co Ltd 映像符号化装置
JPH0884329A (ja) * 1994-09-13 1996-03-26 Canon Inc 画像通信端末装置
JPH09154131A (ja) * 1995-11-29 1997-06-10 Sharp Corp 画像符号化装置
JPH09252462A (ja) * 1996-01-08 1997-09-22 Canon Inc 送信処理装置、テレビ会議システム、送信処理方法及び記憶媒体

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0646404A (ja) * 1992-03-17 1994-02-18 Sony Corp 画像データ処理装置及び画像データ処理方法
JPH06303438A (ja) * 1993-04-19 1994-10-28 Matsushita Electric Ind Co Ltd 映像符号化装置
JPH0884329A (ja) * 1994-09-13 1996-03-26 Canon Inc 画像通信端末装置
JPH09154131A (ja) * 1995-11-29 1997-06-10 Sharp Corp 画像符号化装置
JPH09252462A (ja) * 1996-01-08 1997-09-22 Canon Inc 送信処理装置、テレビ会議システム、送信処理方法及び記憶媒体

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110381320A (zh) * 2019-07-25 2019-10-25 深圳市玩视科技有限公司 信号传输系统、信号编解码方法及装置

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