WO2008072469A1 - メディア送受信方法、メディア送信方法、メディア受信方法、メディア送受信装置、メディア送信装置、メディア受信装置、ゲートウェイ装置、及びメディアサーバ - Google Patents
メディア送受信方法、メディア送信方法、メディア受信方法、メディア送受信装置、メディア送信装置、メディア受信装置、ゲートウェイ装置、及びメディアサーバ Download PDFInfo
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 177
- 238000000034 method Methods 0.000 title claims abstract description 100
- 238000012545 processing Methods 0.000 claims abstract description 41
- 230000005236 sound signal Effects 0.000 claims description 15
- 238000004891 communication Methods 0.000 claims description 10
- 238000000926 separation method Methods 0.000 claims description 4
- 230000015556 catabolic process Effects 0.000 abstract description 7
- 238000006731 degradation reaction Methods 0.000 abstract description 7
- 238000010586 diagram Methods 0.000 description 15
- 230000000694 effects Effects 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/08—Arrangements for detecting or preventing errors in the information received by repeating transmission, e.g. Verdan system
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/236—Assembling of a multiplex stream, e.g. transport stream, by combining a video stream with other content or additional data, e.g. inserting a URL [Uniform Resource Locator] into a video stream, multiplexing software data into a video stream; Remultiplexing of multiplex streams; Insertion of stuffing bits into the multiplex stream, e.g. to obtain a constant bit-rate; Assembling of a packetised elementary stream
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0041—Arrangements at the transmitter end
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
- H04N19/115—Selection of the code volume for a coding unit prior to coding
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/134—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or criterion affecting or controlling the adaptive coding
- H04N19/164—Feedback from the receiver or from the transmission channel
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/60—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding
- H04N19/61—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding in combination with predictive coding
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- H—ELECTRICITY
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- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/434—Disassembling of a multiplex stream, e.g. demultiplexing audio and video streams, extraction of additional data from a video stream; Remultiplexing of multiplex streams; Extraction or processing of SI; Disassembling of packetised elementary stream
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- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
- H04N21/637—Control signals issued by the client directed to the server or network components
- H04N21/6375—Control signals issued by the client directed to the server or network components for requesting retransmission, e.g. of data packets lost or corrupted during transmission from server
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
- H04N21/81—Monomedia components thereof
- H04N21/8106—Monomedia components thereof involving special audio data, e.g. different tracks for different languages
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/16—Analogue secrecy systems; Analogue subscription systems
- H04N7/173—Analogue secrecy systems; Analogue subscription systems with two-way working, e.g. subscriber sending a programme selection signal
- H04N7/17309—Transmission or handling of upstream communications
- H04N7/17318—Direct or substantially direct transmission and handling of requests
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0045—Arrangements at the receiver end
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0075—Transmission of coding parameters to receiver
Definitions
- Media transmission / reception method media transmission method, media reception method, media transmission / reception device, media transmission device, media reception device, gateway device, and media search
- the present invention relates to a method and apparatus for transmitting and receiving encoded media (such as audio and video) data in packets, and media that can be transmitted while preventing degradation of media quality even when packet loss occurs.
- the present invention relates to a transmission / reception method, a media transmission method, a media reception method, a media transmission / reception device, a media transmission device, a media reception device, a gateway device, and a media server.
- IETF RF C1889 Real-time Transport Protocol (RTP) and IETF RFC3016 AMR payload format are standardized for packetizing voice data encoded by AMR-NB.
- RTP Real-time Transport Protocol
- IETF RFC3016 AMR payload format are standardized for packetizing voice data encoded by AMR-NB.
- a mat is defined.
- the ITU-T standard H.263 encoding method and the MPEG standard MPEG-4 method have become widespread as image encoding methods.
- ITU-T H.264 MPEG-4 AVC
- the IETF is Intemet Engineering i ask Force. 7 RF, an abbreviation for Requestoror omments.
- ITU is an abbreviation for International Telecommunication Union.
- MPE G is an abbreviation for Motion Picture Experts Group.
- Patent Document 1 proposes a loss improvement method and system using packet redundancy.
- this method first, n packets obtained by dividing n-time data such as voice to be transmitted and n + 1 redundant packets composed of exclusive OR of the data are transmitted together. Next, even if a loss of one packet occurs, the lost packet is reproduced by exclusive OR of the remaining n-1 packets and the redundant packet to reduce the data loss. Also, even if two or more packet losses occur among n divided packets and redundant packet n + 1 packets, correct the packet if it receives! / Decrypt at time position.
- Patent Document 2 proposes a loss data compensation method in packet data communication.
- packet data including a plurality of N data pieces that are continuous in time series. Generate and send. Further, it receives packet data, and determines whether or not the packet data is subsequent packet data of the packet data received last time based on the sequence number in the received packet data. When the packet loss is determined that the packet data is not the packet data subsequent to the previously received packet data, the data related to the packet loss is compensated by using the data piece in the received packet data.
- Patent Document 3 proposes a wireless network system.
- This system is a wireless network system in which first and second wireless communication devices perform packet communication via a wireless network.
- the first wireless communication device copies the packet to be transmitted to generate a plurality of the same packets, and sends the plurality of the same packets to a plurality of different network paths.
- the second wireless communication device receives packets from one or more network routes, monitors the received packets, and discards the same received packets as those received in the past.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2002-261819
- Patent Document 2 JP 2003-163714 Koyuki
- Patent Document 3 Japanese Patent Laid-Open No. 2005-318395
- the receiving side of the speech coding scheme is equipped with error concealment means, and when it is determined that the packet loss is detected, error concealment is activated to prevent sound interruption and skipping. Since the coding efficiency is improved by using predictions from past signals, the bucket loss is in principle vulnerable to errors and the error concealment method itself is insufficient. For this reason, when the packet loss rate exceeds several percent, there is a problem that sound quality degradation can be clearly detected even if error concealment is performed.
- the present invention has been made in view of the above circumstances, and prevents deterioration of media quality even when packet loss occurs when media-encoded data is transferred in packets via an IP network. It is interesting to provide media transmission / reception methods, media transmission methods, media reception methods, media transmission / reception devices, media transmission devices, media reception devices, gateway devices, and media servers.
- a first media transmission / reception method of the present invention is a media transmission / reception method for performing communication between a transmission device and a reception device, wherein a signal input by the transmission device is transmitted. Is encoded into a predetermined frame length, each frame is encoded to generate encoded data, a redundant data generating step for generating redundant data for the encoded data in the transmission device, The transmitting device stores the encoded data and redundant data in one packet, and the transmitting device performs encoding using connection call processing.
- connection call processing step of notifying the receiver of the setting of at least one encoding bit rate of data and redundant data in the transmitter, in the packet transmission step of transmitting the packet to the receiver, and in the receiver A packet receiving process for receiving a packet transmitted from the transmitting device, and the encoded data stored in the packet and the redundancy based on the setting of the encoding bit rate exchanged between the transmitting device and the receiving device at the receiving device.
- the data supplementing process that compensates for the loss of the encoded data with redundant data, and the receiving device A decoding step of decoding at least one of the encoded data and the redundant data based on the setting of the encoding bit rate exchanged between the transmitting device and the receiving device. And wherein the door.
- a second media transmission / reception method of the present invention is characterized in that, in the first media transmission / reception method of the present invention, the signal is a signal including at least one of a sound and an image.
- a second media transmission / reception method of the present invention is characterized in that, in the first media transmission / reception method of the present invention, a transmitting device stores a plurality of redundant data in a packet and transmits the packet.
- a third media transmission / reception method of the present invention is characterized in that, in the first media transmission / reception method of the present invention, a transmission device stores a plurality of encoded data in a packet and transmits the packet.
- a fourth media transmission / reception method of the present invention is characterized in that, in the first media transmission / reception method of the present invention, encoded bit rates of encoded data and redundant data are different from each other.
- a first media transmission method of the present invention is a media transmission method in which communication is performed with a receiving device, wherein an input signal is divided into a predetermined frame length, each frame is encoded, An encoding process for creating encoded data, a redundant data generating process for generating redundant data for the encoded data, a packet storing process for storing the encoded data and redundant data in one packet, and a connection call A connection call processing step of notifying the reception device of a setting of at least one encoding bit rate of the encoded data and the redundant data, and a packet transmission step of transmitting the packet to the reception device.
- a second media transmission method of the present invention is the first media transmission method of the present invention, wherein the signal is a signal including at least one of sound and image.
- a third media transmission method of the present invention is the first media transmission method of the present invention, wherein the packet storing step stores a plurality of redundant data in the packet.
- a fourth media transmission method of the present invention is characterized in that, in the first media transmission method of the present invention, the packet storing step stores a plurality of encoded data in the packet.
- a fifth media transmission method of the present invention is characterized in that, in the first media transmission method of the present invention, encoded bit rates of encoded data and redundant data are different from each other.
- a first media reception method of the present invention is a media reception method for communicating with a transmission device, comprising: a packet reception step for receiving a packet transmitted from the transmission device; and the transmission device.
- a data separation process that separates the coded data stored in the packet from the redundant data based on the setting of the coded bit rate exchanged between them, and the coded data if a problem occurs during packet transmission.
- a data compensation process for compensating for the loss of data with redundant data, a decoding process for decoding at least one of the encoded data and the redundant data based on the setting of the encoding bit rate exchanged with the transmission device, It is characterized by having
- a second media reception method of the present invention is characterized in that, in the first media reception method of the present invention, the encoded data is data obtained by encoding either an audio signal or an image signal. To do.
- a third media reception method of the present invention is characterized in that, in the first media reception method of the present invention, encoded bit rates of encoded data and redundant data are different from each other.
- the first media transmission / reception device of the present invention divides an input signal into a predetermined frame length, creates an encoded data obtained by encoding each frame, and an encoded data Stored in each packet by a media transmitter / receiver having a redundant data generator for generating redundant data and a data transmitter / receiver for transmitting / receiving packets stored in the encoded data and redundant data packets.
- a media transmitter / receiver having a redundant data generator for generating redundant data and a data transmitter / receiver for transmitting / receiving packets stored in the encoded data and redundant data packets.
- connection call processing unit for exchanging the setting of the encoded data and redundant data and the setting of at least one encoding bit rate of the encoding unit and redundant data generation unit between the media transmission / reception devices.
- a decoding unit that decodes at least one of the encoded data and the redundant data based on the setting of the converted encoding bit rate, and the data transmission / reception unit is a packet exchanged between the media transmission / reception devices.
- the coded data stored in the packet is separated from the redundant data based on the data setting stored in the packet, and if a loss occurs during packet transmission, the loss of the coded data is compensated with the redundant data. It is characterized by that.
- the second media transmission / reception device of the present invention is characterized in that, in the first media transmission / reception device of the present invention, the signal is a signal including at least one of a sound and an image.
- a third media transmitting / receiving apparatus of the present invention is characterized in that, in the first media transmitting / receiving apparatus of the present invention, the data transmitting / receiving unit stores a plurality of redundant data in each packet and transmits the packets. .
- a fourth media transmission / reception device is the first media transmission / reception device according to the present invention, wherein the data transmission / reception unit stores a plurality of encoded data in each packet and transmits the packets. .
- a fifth media transmission / reception device of the present invention is characterized in that, in the first media transmission / reception device of the present invention, encoding bit rates for encoding data in the encoding unit and the redundant data generation unit are different. To do.
- a first media transmission device of the present invention is a media transmission device that communicates with a reception device, divides an input signal into a predetermined frame length, encodes each frame, An encoding means for creating encoded data; a redundant data generating means for generating redundant data for the encoded data; a packet storage means for storing the encoded data and redundant data in one packet; A connection call processing means for notifying a receiving apparatus of a setting of at least one encoding bit rate of encoded data and redundant data, and a packet transmitting means for transmitting a packet to the receiving apparatus. And
- a second media transmission device of the present invention is characterized in that, in the first media transmission device of the present invention, the signal is a difference between an audio signal and an image signal.
- a third media transmission device of the present invention is characterized in that, in the first media transmission device of the present invention, the packet storage means stores a plurality of redundant data in the packet.
- a fourth media transmission device of the present invention is the first media transmission device of the present invention.
- the packet storage means stores a plurality of encoded data in the packet.
- the fifth media transmission device of the present invention is characterized in that, in the first media transmission device of the present invention, the encoding bit rates of the encoded data and the redundant data are different from each other.
- a first media reception device of the present invention is a media reception device that communicates with a transmission device, and includes a packet reception unit that receives a packet transmitted from the transmission device, and a transmission device.
- Data separating means for separating the encoded data stored in the packet from the redundant data based on the setting of the encoded bit rate exchanged between them, and the encoded data if a problem occurs during packet transmission.
- Data compensating means for compensating for the loss of the data with redundant data, decoding means for decoding at least one of the encoded data and the redundant data based on the setting of the encoding bit rate exchanged with the transmitting device, It is characterized by having
- the second media reception device of the present invention is characterized in that, in the first media reception device of the present invention, the encoded data is data obtained by encoding either an audio signal or an image signal. To do.
- a third media reception device of the present invention is characterized in that, in the first media reception device of the present invention, encoded bit rates of encoded data and redundant data are different from each other.
- the gateway device of the present invention includes any one of the first to fifth forces of the present invention, one media transmission / reception device, any one of the first to fifth forces of the present invention, one media transmission device, Any one of the first to third forces and one of the media receiving devices is characterized.
- the media server of the present invention includes any one of the first to fifth forces of the present invention, one media transmission / reception device, any one of the first to fifth forces of the present invention, one media transmission device, and the first of the present invention. Any one of the powers from 1 to 3 and one media receiving device is provided. The invention's effect
- the present invention can prevent degradation of media quality even when packet loss occurs when media encoded data is transferred in packets via an IP network.
- FIG. 1 is a diagram showing a system configuration of a media transmission / reception apparatus according to the present embodiment.
- FIG. 8 is a diagram showing the operation of the media transmitting / receiving apparatus (transmitting side and receiving side) according to the present embodiment.
- an audio signal is handled as a media signal
- the present invention is not limited to this.
- it may be an image signal or a signal including at least one of sound and image (still image / moving image).
- audio transmitting / receiving apparatuses 101 and 109 each include both an audio data transmitting unit and an audio data receiving unit, but for simplification of description, only the audio transmitting unit is shown in 101. 109 shows only the voice receiver. Therefore, in the following description, the audio transmission / reception device 101 is described as the transmission side, and the audio transmission / reception device 109 is described as the reception side. Further, 101 may be configured to have a speech decoding unit. In the present embodiment, the audio transmission / reception devices 101 and 109 are connected to a transmission path 108 based on an IP (Internet Protocol) network. Moreover, the power transmission protocol that describes the IP transmission protocol as RTP (Rea Time Transport Protocol) / UDP (User Datagram Protocol) / IP is not limited to RTP / UDP.
- IP Internet Protocol
- the voice transmitting / receiving apparatus 101 divides the input voice signal into frames by the voice encoding unit 104 and encodes each frame to create voice encoded data (step S 1 in FIG. 8).
- a well-known method such as AMR-NB can be used as the speech encoding method.
- the frame length is 20 ms in the case of AMR-NB. In the case of other encoding methods, the frame length specific to the encoding method or a predetermined frame length is used.
- the redundant data generation unit 106 generates redundant data for the input voice signal or voice encoded data (step S2 in FIG. 8).
- There are various configurations for generating redundant data For example, a method in which the same audio encoded data created by the audio encoding unit 104 is used redundantly as redundant data, and an audio signal encoded at a bit rate lower than that of the audio encoded data is used as redundant data. And a method of shifting the frame timing of encoded speech data and redundant data.
- these settings can be determined in advance, or can be notified from the transmission side to the reception side or from the reception side to the transmission side using the connection call processing described later.
- the voice data transmitting unit 107 stores at least one (at least one frame) voice encoded data and at least one (at least one frame) redundant data in the same RTP / UDP packet (see FIG. 8 steps S3).
- the setting of the number of frames of voice data, the number of frames of redundant data, the setting of the amount of time shift between the voice data and the redundant data, etc. can be determined in advance, or the connection call processing described later. It can also be set.
- the connection call processing unit 102 notifies the voice transmission / reception device 109 of the setting (step S4 in FIG. 8).
- a method of notifying the setting there is a method of notifying using SDP (Session Description Protocol).
- SDP Session Description Protocol
- the contents of SDP can refer to IETF RFC2327.
- Other known methods besides SDP may be used.
- the above setting can be notified by adding a unique description to the RTP payload format header (the RTP payload format standard in the case of AMR is RFC3267).
- the voice data transmission management unit 103 sends the voice encoding unit 104 and the redundant data generation unit 106 to data of one frame of voice. On the other hand, it is instructed how many frames of redundant data are generated. Also, the voice data transmitting unit 107 is instructed by how many frames of redundant data are added to one frame of voice and how to arrange the order.
- connection call processing 110 of the reception side voice transmission / reception device 109 may be configured to perform the connection call processing to the connection call processing unit 102 of the transmission side voice transmission / reception device 101.
- connection call processing unit 110 of the voice transmitting / receiving apparatus 109 receives a notification about the setting from the connection call processing unit 102 (step S5 in FIG. 8), and sets the setting value (setting Information indicating the contents (setting information) is output to the audio data / redundant data receiving unit 111 and the audio decoding unit 112.
- the voice data 'redundant data receiving unit 111 transmits the packet from the transmission path 108. (Step S7 in FIG. 8), and the setting information from the connected call processing unit 110 is received. Received and based on the setting information, voice data and redundant data are separated from the packet (step S8 in FIG. 8).
- the audio data'redundant data receiving unit 111 has a buffer memory therein, and writes the separated audio data and redundant data into the buffer memory. The writing process to the no-fat memory is performed as follows.
- the audio data and the redundant data are stored in the packet one frame at a time, and are transmitted with a shift of one frame.
- Nth frame audio data and N ⁇ 1th frame redundant data are received.
- the N-1 frame audio data and the N-2 frame redundant data could not be received. Therefore, with the redundant data of the N-1st frame received at the present time, the lost audio data (N-1st frame of audio data) is compensated, and the N-1th frame of redundant data and the Nth frame of audio data are compensated.
- step S10 in Fig. 8 Data is input to the buffer (step S10 in Fig. 8). If both the previous packet and the current packet are received correctly without any packet loss (step S9 / NO in Fig. 8), the redundant data of the N-1st frame is discarded, Write the Nth frame of audio data to the buffer memory (step Sl l in Fig. 8). After such processing, the data written in the buffer memory is output to the audio decoding unit 112.
- the voice decoding unit 112 receives the data written in the buffer memory in the voice data 'redundant data receiving unit 111, and outputs the data to the voice decoder (voice decoder) in order for each frame.
- the reproduced audio signal is calculated by decoding the data and output (step S12 in FIG. 8).
- FIG. 2 is a diagram showing a system configuration of the media transmitting / receiving apparatus according to the present embodiment.
- FIG. 8 is a diagram showing the operation of the media transmitting / receiving apparatus (transmitting side and receiving side) according to the present embodiment.
- an image signal is handled as a media signal
- it may be an audio signal or a signal including at least one of audio and image (still image / moving image).
- the components denoted by the same reference numerals as those in FIG. 1 perform the same operations as those in FIG. 1, and thus the description thereof is omitted here.
- Image transmission / reception devices 601 and 709 each include both an image data transmission unit and an image data reception unit.
- image transmission / reception device 601 shows only image data transmission unit 607, and image transmission / reception is performed. In the device 709, only the image data / redundant data receiving unit 711 is shown. Therefore, in the following description, the voice transmission / reception device 601 is described as the transmission side, and the voice transmission / reception device 709 is described as the reception side. Further, 601 may be configured to include an image decoding unit.
- the image transmission / reception devices 601 and 709 are connected to a transmission path 108 using an IP (Internet Protocol) network.
- the IP transmission protocol is described as Ri'P (Realtime Yansport Protocol) / iJDP (User Datagram Protocol 1) / IP, and the transmission protocol is not limited to RTP / UDP.
- the image transmission / reception device 601 encodes the input image signal by the image encoding unit 604 to generate image encoded data (step Sl in FIG. 8).
- image encoding method a known method such as MPEG-4, H.263, H.264, or the like can be used.
- the redundant data generation unit 605 generates redundant data for the input image signal or image encoded data (step S2 in FIG. 8).
- There are various configurations for generating redundant data For example, a method in which the same image encoded data created by the image encoding unit 604 is used redundantly as redundant data, and an image signal encoded at a lower bit rate than the image encoded data is used as redundant data. And a method of shifting the time timing of image encoded data and redundant data. These settings can be determined in advance, or can be notified from the transmission side to the reception side or from the reception side to the transmission side using the connection call processing described later.
- the image data transmission unit 607 stores at least one (eg, at least one video packet) image encoded data and at least one (eg, at least one video packet) redundant data in the same RTP / UDP packet.
- the setting of the number of encoded image data for example, the number of video packets
- the number of redundant data for example, the number of video packets
- the setting of the amount of time shift between the encoded image data and the redundant data etc. It can be determined, or can be set by connection call processing described later.
- the call processing unit 602 notifies the image transmission / reception apparatus 709 of the setting (step S4 in FIG. 8).
- SDP can refer to IETF RFC2327.
- other well-known methods may be used. For example, an original description is added to the RTP payload format header (the standard of the RTP payload format in the case of MPEG-4 is RFC3267) and the setting is rejected.
- the image data transmission management unit 603 sends the data of one video packet of the image to the image encoding unit 604 and the redundant data generation unit 605. On the other hand, it indicates how many video packets of redundant data are generated. Also, the image data transmission unit 607 is instructed to add redundant data (redundant packet) to each video packet of the image, how to arrange them, and how to arrange them! / Do.
- connection call processing unit 710 can perform a connection call process to the connection call processing unit 602 of the image transmission / reception device 601 on the transmission side.
- connection call processing unit 710 of the image transmission / reception device 709 receives a notification of the setting from the connection call processing unit 602 (step S5 in FIG. 8), and the setting value is converted into image data.
- step S6 in FIG. 8 When a packet is transmitted from the image data transmission unit 607 of the image transmission / reception device 601 via the transmission path 606 (step S6 in FIG. 8), the image data 'redundant data reception unit 711 Is received (step S7 in FIG. 8) and the setting information is received from the call connection processing unit 710, the image data and the redundant data are separated from the packet based on the setting information (step S8 in FIG. 8).
- the image data 'redundant data receiving unit 711 has a buffer memory therein, and writes the separated image data and redundant data to the buffer memory. Write to the buffer memory by the following method.
- the image data 'redundant data receiving unit 711 includes the Nth video packet data and the Nth video packet data. Receive 1 redundant data.
- step S9 if a packet loss occurs at a time one video packet before the current time and the packet is not received (step S9 / YES in FIG. 8), the N-1st video packet data and the N-th video packet data are received. 2 redundant data could not be received. Therefore, the N-1th redundant data received at the present time is used to make up for the lost image data (N-1st frame image data), and the N-1 redundant data and the Nth video packet data Input to the buffer (step S10 in Fig. 8).
- step S9 if packet loss does not occur in both the packet before one video packet and the current packet and the packet can be received correctly (step S9 / NO in FIG. 8), the N 1st redundant data is stored. Discard and write only the Nth video packet data (image encoded data) to the buffer memory (step Sl l in Fig. 8). Thereafter, the data written in the buffer memory is output to the image decoding unit 712.
- the image decoding unit 712 receives the data written in the buffer memory in the image data 'redundant data receiving unit 711, and outputs the data to the image decoder (image decoder) in order for each video packet, for example.
- the image decoder decodes the data and outputs a reproduced image voice signal (step S12 in FIG. 8).
- FIG. 3 is a diagram showing a specific configuration of RTP payload data in audio data transmitting section 107 shown in FIG.
- the same configuration can be used for the force S and image data described when audio data is added to RTP payload data.
- the RTP payload data is composed of one speech encoded data S l (n) (Nth frame) and one redundant data Rl (n) (N-1st frame).
- RTP payload data includes one speech encoded data Sl (n) (Nth frame) and two redundant data Rl (n) (for example, the N-1st frame and the Nth frame).
- the second frame) shows the added configuration.
- the number of redundant data may be two or more. In this figure, the case of audio data is described, but the same configuration can be used for image data.
- a packet 401 shown in FIG. 5 stores a plurality of audio data and a plurality of redundant data in the same RTP packet.
- RTP payload data includes two encoded audio data S 1 (n) (the Nth frame and the (N + 1) th frame) and two redundant data Rl (n) (for example, the Nth ⁇ The first and Nth frames) are added.
- the number of encoded audio data may be two or more, and the number of redundant data may be two or more.
- the case of audio data is described. However, in the case of image data, it is possible to use a similar configuration with the force S.
- FIG. 6 is a diagram showing an example of how RTP payload data is arranged in an RTP packet.
- Figure 6 shows an example of collecting multiple RTP packets shown in Figure 3 and storing them in a single UDP packet.
- FIG. 6 shows an example of storing two RTP packets in one UDP, and two or more RTP packets may be stored in one UDP.
- the RTP packet may be a combination of RTP packets shown in FIGS. 3 and 4, a combination of RTP packets shown in FIGS. 3 and 5, or a combination of RTP packets shown in FIGS.
- the case of audio data is described, but the same configuration can be used for image data.
- FIG. 7 is a diagram showing a configuration when the media transmission / reception device according to the above-described embodiment is applied to a media server device or a gateway device. Although FIG. 7 describes the case of transmitting and receiving audio data, the same configuration can be used for image data.
- the media server device or gateway device outputs the input voice signal from the voice data transmission unit 107 to the IP network 108 as a packet.
- reference numeral 501 denotes a media server device or a gateway device.
- Media server device or gateway device In 501 an audio signal or an encoded bit stream is input.
- the media server device or the gateway device 501 outputs a bit stream in which an audio signal is encoded or an encoded bit stream.
- the speech encoding / redundancy data generation unit 520 is capable of generating redundant data by copying the encoded bit stream, or once decoding the encoded bit stream and re-generating it at a different bit rate. Encode to create and output redundant data.
- the voice data transmission management unit 503 When notified from the connected call processing unit 102 of the above settings, the voice data transmission management unit 503 provides redundancy to the voice encoding / redundancy data generation unit 520 for one frame of voice data. Indicates how many frames of data are to be generated. Also, the voice data transmitting unit 107 is instructed by how much redundant data (redundant frames) should be added to one frame of voice and how to arrange them in order.
- Reference numeral 509 denotes a terminal that receives media distribution, and is connected to the media server device or gateway device 501.
- components having the same numbers as in FIG. 1 operate in the same manner as in FIG. The configuration is the same when only the image signal is handled or when both the audio signal and the image signal are used.
- control operation in the above-described embodiment can be executed by hardware, software, or a combined configuration of both.
- software processing it is possible to install a program that records the processing sequence in the memory of a computer incorporated in the dedicated hardware and execute it, or to execute various processes.
- the program can be installed and executed on a general purpose computer.
- This program can be recorded in advance on, for example, a hard disk or ROM (Read Only Memory) as a recording medium.
- the program is a floppy (registered) (Registered trademark) disc, CD—ROM (Compact Disc Read Only Memory), MO (Magneto Optical) disc, DVD (Digital Versatile Disc), magnetic disc, semiconductor memory, and other removable recording media, temporarily or It can be stored (recorded) permanently.
- a removable recording medium can be provided as so-called package software.
- the program is installed on the computer from the above-mentioned removable recording medium, transferred from the download site to the computer wirelessly, or transferred to the computer via a network such as a LAN (Local Area Network) or the Internet.
- the computer can receive the transferred program and install it on a recording medium such as a built-in hard disk.
- the media transmission / reception system composed of the transmission / reception device on the transmission side and the media transmission / reception device on the reception side described in the above embodiment may be configured as a logical set of a plurality of devices, It is also possible to construct such that functions are mixed.
- FIG. 1 is a block diagram showing a system configuration of a media transmission / reception apparatus according to a first embodiment.
- FIG. 2 is a block diagram showing a system configuration of a media transmission / reception apparatus according to a second embodiment.
- FIG. 3 is a diagram showing a configuration of an RTP packet added to RTP payload data transmitted / received between media transmitting / receiving apparatuses according to the present embodiment.
- FIG. 4 is a diagram showing a configuration of an RTP packet added to RTP payload data transmitted / received between media transmitting / receiving apparatuses according to the present embodiment.
- FIG. 5 is a diagram showing a configuration of an RTP packet added to RTP payload data transmitted / received between media transmitting / receiving apparatuses according to the present embodiment.
- FIG. 6 is a diagram showing a configuration of an RTP packet added to RTP payload data transmitted / received between media transmitting / receiving apparatuses according to the present embodiment.
- FIG. 7 is a block diagram showing a configuration when the media transmission / reception device according to the present embodiment is installed in a media server device or a gateway device.
- FIG. 8 is a sequence diagram showing an operation of the media transmitting / receiving apparatus (transmitting side and receiving side) according to the present embodiment.
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Multimedia (AREA)
- Computer Networks & Wireless Communication (AREA)
- Quality & Reliability (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
- Detection And Prevention Of Errors In Transmission (AREA)
- Communication Control (AREA)
- Compression Or Coding Systems Of Tv Signals (AREA)
- Telephonic Communication Services (AREA)
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP07832598A EP2093920A1 (en) | 2006-12-11 | 2007-11-27 | Media transmission/reception method, media transmission method, media reception method, media transmission/reception device, media transmission device, media reception device, gateway device, and media server |
MX2009005900A MX2009005900A (es) | 2006-12-11 | 2007-11-27 | Metodo de transmision/recepcion de medios, metodo de transmision de medios, metodo de recepcion de medios, dispositivo de transmision/recepcion de medios, dispositivo de transmision de medios, dispositivo de recepcion de medios, dispositivo de acceso |
JP2008549238A JPWO2008072469A1 (ja) | 2006-12-11 | 2007-11-27 | メディア送受信方法、メディア送信方法、メディア受信方法、メディア送受信装置、メディア送信装置、メディア受信装置、ゲートウェイ装置、及びメディアサーバ |
BRPI0718336-4A2A BRPI0718336A2 (pt) | 2006-12-11 | 2007-11-27 | Método de transmissão/recepção de mídia, método de transmissão de mídia, método de recepção de mídia , aparelho de transmissão/recepção de mídia, aparelho de transmissão de mídia, aparelho de recepção de mídia, aparelho de gateway e servidor de mídia |
KR1020097012071A KR101153694B1 (ko) | 2006-12-11 | 2007-11-27 | 미디어 송수신 방법, 미디어 송신 방법, 미디어 수신 방법, 미디어 송수신 장치, 미디어 송신 장치, 미디어 수신 장치, 게이트웨이 장치 및 미디어 서버 |
US12/518,347 US20100027618A1 (en) | 2006-12-11 | 2007-11-27 | Media transmitting/receiving method, media transmitting method, media receiving method, media transmitting/receiving apparatus, media transmitting apparatus, media receiving apparatus, gateway apparatus, and media server |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006-333708 | 2006-12-11 | ||
JP2006333708 | 2006-12-11 |
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WO2008072469A1 true WO2008072469A1 (ja) | 2008-06-19 |
Family
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PCT/JP2007/072873 WO2008072469A1 (ja) | 2006-12-11 | 2007-11-27 | メディア送受信方法、メディア送信方法、メディア受信方法、メディア送受信装置、メディア送信装置、メディア受信装置、ゲートウェイ装置、及びメディアサーバ |
Country Status (9)
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US (1) | US20100027618A1 (ja) |
EP (1) | EP2093920A1 (ja) |
JP (2) | JPWO2008072469A1 (ja) |
KR (1) | KR101153694B1 (ja) |
CN (1) | CN101554007A (ja) |
BR (1) | BRPI0718336A2 (ja) |
MX (1) | MX2009005900A (ja) |
RU (1) | RU2009126574A (ja) |
WO (1) | WO2008072469A1 (ja) |
Cited By (1)
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JP2021057695A (ja) * | 2019-09-27 | 2021-04-08 | 沖電気工業株式会社 | 処理装置、処理システム、処理プログラムおよび処理方法 |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
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CN102223201B (zh) * | 2010-04-15 | 2014-01-01 | 中兴通讯股份有限公司 | 一种编解码器能力协商方法及终端 |
ITTO20120901A1 (it) * | 2012-10-15 | 2014-04-16 | Rai Radiotelevisione Italiana | Procedimento di codifica e decodifica di un video digitale e relativi dispositivi di codifica e decodifica |
KR102017746B1 (ko) * | 2012-11-14 | 2019-09-04 | 한국전자통신연구원 | 유사도 산출 방법 및 그 장치 |
US9756356B2 (en) * | 2013-06-24 | 2017-09-05 | Dialogic Corporation | Application-assisted spatio-temporal error concealment for RTP video |
CN112187817B (zh) * | 2020-10-09 | 2023-03-31 | 厦门亿联网络技术股份有限公司 | 流媒体数据传输方法、装置、设备及存储介质 |
CN116846038A (zh) * | 2023-08-29 | 2023-10-03 | 武汉船用电力推进装置研究所(中国船舶集团有限公司第七一二研究所) | 一种电池数据的采集与传输方法、装置、设备及存储介质 |
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- 2007-11-27 US US12/518,347 patent/US20100027618A1/en not_active Abandoned
- 2007-11-27 EP EP07832598A patent/EP2093920A1/en not_active Withdrawn
- 2007-11-27 KR KR1020097012071A patent/KR101153694B1/ko not_active IP Right Cessation
- 2007-11-27 CN CNA2007800455378A patent/CN101554007A/zh active Pending
- 2007-11-27 JP JP2008549238A patent/JPWO2008072469A1/ja active Pending
- 2007-11-27 RU RU2009126574/09A patent/RU2009126574A/ru not_active Application Discontinuation
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Also Published As
Publication number | Publication date |
---|---|
CN101554007A (zh) | 2009-10-07 |
JP2012165429A (ja) | 2012-08-30 |
KR20090089397A (ko) | 2009-08-21 |
JPWO2008072469A1 (ja) | 2010-03-25 |
BRPI0718336A2 (pt) | 2013-11-19 |
MX2009005900A (es) | 2009-06-19 |
US20100027618A1 (en) | 2010-02-04 |
EP2093920A1 (en) | 2009-08-26 |
KR101153694B1 (ko) | 2012-06-18 |
RU2009126574A (ru) | 2011-01-20 |
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