DE102013220901A1 - Method for transmitting digital audio and / or video data - Google Patents

Method for transmitting digital audio and / or video data

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Publication number
DE102013220901A1
DE102013220901A1 DE201310220901 DE102013220901A DE102013220901A1 DE 102013220901 A1 DE102013220901 A1 DE 102013220901A1 DE 201310220901 DE201310220901 DE 201310220901 DE 102013220901 A DE102013220901 A DE 102013220901A DE 102013220901 A1 DE102013220901 A1 DE 102013220901A1
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DE
Germany
Prior art keywords
data
transmitted
signal
main
data block
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
DE201310220901
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German (de)
Inventor
Thomas Rosenstock
Alexander Stege
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Continental Automotive GmbH
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Continental Automotive GmbH
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Publication date
Application filed by Continental Automotive GmbH filed Critical Continental Automotive GmbH
Priority to DE201310220901 priority Critical patent/DE102013220901A1/en
Publication of DE102013220901A1 publication Critical patent/DE102013220901A1/en
Application status is Ceased legal-status Critical

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/41Structure of client; Structure of client peripherals
    • H04N21/414Specialised client platforms, e.g. receiver in car or embedded in a mobile appliance
    • H04N21/41422Specialised client platforms, e.g. receiver in car or embedded in a mobile appliance located in transportation means, e.g. personal vehicle
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/234Processing of video elementary streams, e.g. splicing of video streams, manipulating MPEG-4 scene graphs
    • H04N21/2343Processing of video elementary streams, e.g. splicing of video streams, manipulating MPEG-4 scene graphs involving reformatting operations of video signals for distribution or compliance with end-user requests or end-user device requirements
    • H04N21/23439Processing of video elementary streams, e.g. splicing of video streams, manipulating MPEG-4 scene graphs involving reformatting operations of video signals for distribution or compliance with end-user requests or end-user device requirements for generating different versions
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network, synchronizing decoder's clock; Client middleware
    • H04N21/44Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs
    • H04N21/44004Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs involving video buffer management, e.g. video decoder buffer or video display buffer
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network, synchronizing decoder's clock; Client middleware
    • H04N21/442Monitoring of processes or resources, e.g. detecting the failure of a recording device, monitoring the downstream bandwidth, the number of times a movie has been viewed, the storage space available from the internal hard disk
    • H04N21/44209Monitoring of downstream path of the transmission network originating from a server, e.g. bandwidth variations of a wireless network
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60Network 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 
    • H04N21/63Control 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
    • H04N21/637Control signals issued by the client directed to the server or network components
    • H04N21/6377Control signals issued by the client directed to the server or network components directed to server
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/80Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
    • H04N21/83Generation or processing of protective or descriptive data associated with content; Content structuring
    • H04N21/845Structuring of content, e.g. decomposing content into time segments
    • H04N21/8451Structuring of content, e.g. decomposing content into time segments using Advanced Video Coding [AVC]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/30Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using hierarchical techniques, e.g. scalability
    • H04N19/37Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using hierarchical techniques, e.g. scalability with arrangements for assigning different transmission priorities to video input data or to video coded data

Abstract

A transmission of digital audio and / or video data to a data receiver generating from the transmitted data a playback signal (W) is described by means of a packet-oriented data transmission. In this case, signals to be transmitted are transmitted as digital data blocks (1, 4) in a plurality of data streams which form at least one main data stream and one correction data stream, with which compressed data blocks (1, 4) of the signals are transmitted, the data blocks ( 1, 4) compress the signals to be transmitted such that the main data block (1) transmitted in the main data stream contains basic data (I) for generating the reproduction signal (W) for a certain playback duration in a reproducible form with a high compression and the correction data block (4) transmitted in the correction data stream comprises in each case signal supplementation data (K) belonging to a main data block (1), which supplement the strongly compressed basic data (I) of the main data block (1) for improving the quality of reproduction. It is provided that the signal supplement data (K) are then used in the generation of the reproduction signal (W), if they are already transmitted to the receiver at this time, and otherwise the reproduction signal only from those transmitted to the main data block (1) Basic data (I) is generated.

Description

  • The invention relates to a method for transmitting digital audio and / or video data, such. As broadcasting, music, etc., to one of the transmitted data generating a playback signal, in particular mobile data receiver by means of a packet-oriented data transmission. The moving data receiver may in particular be a multimedia unit in a motor vehicle with a radio function.
  • Due to the movement of the motor vehicle or the data receiver installed therein, during operation of an audio signal and / or video signal to be reproduced immediately or promptly, different reception conditions or different data widths in the transmission channel may occur.
  • In the proposed method is provided to be transmitted signals, d. H. Audio and / or video signals in the nature of digital audio and / or video data to be transmitted as digital data blocks in multiple data streams forming at least one main data stream and one correction data stream. With these data streams, respectively compressed data blocks of the signals are transmitted, i. H. the original audio and / or video signals are converted to compressed audio and / or video data in the data blocks. It is provided that the main data block transmitted in the main data stream contains basic data for generating the audio and / or video signal for a certain playback time in an already reproducible form, but with a high compression. The measure of the strong compression is a still tolerable reproduction quality of the audio and / or video signal without the playback disturbing events such as playback interruptions. Such high compression is known to those skilled in the art from so-called bitrate peeling methods, which achieves greater flexibility in the encoding of digital multimedia content. These bitrate peeling methods are based on hierarchically building up the coding for a compressed data block. For a video image, this means, for example, that the video image is first stored in a coarsely compressed form and then one or more supplemental data blocks are appended with correction data, each of which incrementally refines or enhances the previous block to improve image quality increase. The already known video standard "Scalable Video Coding" (SVC) implements this procedure. For audio data corresponding experimental methods are known, for. B. on the basis of Ogg Vorbis.
  • Accordingly, the band width of the data transmission channel which is necessary for the main data stream thus also represents the minimum bandwidth for the reception and the reproduction of a signal which is still qualitatively tolerable.
  • As part of the method, it is further provided that the correction data block transmitted in the correction data stream has signal supplementation data corresponding to the basic data, which supplement the strongly compressed basic data of the main data block for improving the reproduction quality, so that the combination of the audio and / or or video data of main data block and correction data block generate a reproduction signal of higher quality than the reproduction signal generated only from the main data block. Also, the reproduction signal generated by the combination of the audio and / or video data of main data block and correction data block is played back in the playback period of the main data block.
  • The preferred context of the invention relates to radio or multimedia data receiver with possibly also greatly varying reception conditions during operation. This occurs, for example, in multimedia units with radio and / or TV function of a motor vehicle. In accordance with the movement of the motor vehicle, the available signal quality changes continuously during operation. Not all transmission standards for media streaming, d. H. The transmission of an audio and / or video signal for direct playback, so can handle enough and ensure the best possible sound and / or image quality at each reception. In particular, in the case of packet-oriented transmission methods, such as the Internet radio, this leads either to frequent dropouts, if the bandwidth of the transmission channel is not sufficient for the data packets required for reproduction in the selected quality, or from the outset with very low bandwidth and thus Audio and / or video quality to minimize the frequency of dropouts. However, a durable low-quality transmission results in user acceptance problems.
  • The reception standard for radio, the analogue AM / FM radio, which is currently the most widespread in the automotive sector, automatically adapts to the respective transmission quality. In addition, the radio stations radiate the analogue radio signal in high bandwidth and quality. Under good reception conditions, the sound of this quality is reproduced by the receiver. In worse reception conditions distortions and noise increase in principle, because the analog signal is received with correspondingly poorer quality.
  • Most Internet streaming providers that provide audio and / or video for generating a video signal in packet-oriented transmission methods provide multiple streams of data with different bandwidths from which the user can choose the one that suits him best, ie corresponds to the current reception conditions. Some providers also perform a bandwidth test of the transmission channel before streaming, by measuring the data rate when downloading a test file, and then automatically selecting the data stream (stream) with the appropriate bandwidth. However, this only makes sense for stationary receivers with non-changing reception conditions, since only there does the bandwidth of the transmission remain reasonably constant during the streaming.
  • In further development of this streaming method describes the WO 98/37698 A1 a method of transmitting audio and video signals over a data connection. The signals are subdivided on a data server into basic data and auxiliary data based on this basic data. While basic and sub-base audio data are transmitted to a receiver via a base data stream, the auxiliary data may be sent to the receiver via auxiliary data streams and coupled to the data link as the bandwidth increases. As the number of auxiliary data streams transmitted increases, the quality of reproduction of the media signals is increased. At low bandwidth, less auxiliary data streams are transmitted, reducing the quality of the media content. This adaptation of the reproduction quality of the media signals to the available bandwidth can also take into account the computing power of the received device, for example if the computing power only allows a playback of the media signals with lower reproduction quality. For this purpose, the available bandwidth is determined and set the number of data streams to be transmitted.
  • Also the WO 2008/082375 A2 describes the use of a basic data stream and additional auxiliary data streams to match the quality of reproduction of audio and / or video content to the bandwidth of the data connection used for transmission. The disclosed method is for use in conferencing, wherein the conference participants communicate by exchanging audio and video signals over the data link.
  • The US 2005/0076136 A1 also discloses a method for matching the reproduction quality of multimedia signals to the bandwidth of a data link used to transmit the signals. In this case, the bandwidth of the data connection is determined by means of the transmission of metadata.
  • The WO 00/72599 A1 relates to a method for transmitting multimedia signals via an internet protocol and a data server providing the signals. After determining the available bandwidth, the playback quality of the media signals is adjusted to the bandwidth. The contents are compressed on the data server and then transmitted in compressed form.
  • Even with these methods, there is the problem that bandwidth fluctuations may under certain circumstances not be recognized flexibly, so that the methods proposed there are also not suitable for multimedia data receivers whose reception conditions regularly change significantly during operation.
  • The object of the invention is therefore to propose a method for the transmission of digital audio and / or video data, which allows a possible uninterrupted playback signal even when operating conditions vary greatly during reception.
  • This object is achieved with the features of claim 1. For this purpose, it is provided in a method of the type mentioned in particular that the signal supplementation data are then used in the generation of the playback signal, if at this time, d. H. in the generation of the playback signal, already transferred to the receiver. For the purposes of the invention, this is equivalent to the fact that the signal supplementation data are present at the reproduction time of the playback signal in a format that can be utilized for the reproduction. Otherwise, the reproduction signal is generated only from the basic data transmitted with the main frame. Thus, according to the present invention, the signal supplement data from the correction data block refines the basic data of the signal to be reproduced from the basic data block, so that the reproduction signal generated by the receiver is qualitatively better in case of considering the correction data (signal complement data of the correction data block) , if the correction data block was received on time.
  • This also makes it possible according to the invention to spontaneously change the signal quality "on the flight", ie during the successive reproduction of the different data blocks after the playback period of a data block, if the signal supplement data is not available due to a fluctuation in the bandwidth. An interruption of the playback signal, as it results, for example, by short pauses in the playback when the can not be provided for the playback signal at the desired playback time necessary data can be avoided in this way, if the transmission quality is sufficient to transmit the highly compressed audio and video data of the main data block in a timely manner. Optionally, a change in signal quality for the playback signal may also depend on certain criteria, which will be discussed later.
  • In addition, according to a particularly preferred embodiment, it can be provided that during the reception of at least the main data stream, but preferably of all main and correction data streams, the bandwidth of the transmission or of the transmission channel by means of a fill level monitoring of the receiving buffer for the received data, in particular the basic data and, if appropriate, the signal supplementation data from one or more inventive correction data streams is detected. Thus, the compression format proposed according to the invention can be used in accordance with the bitrate peeling in combination with a fill level monitoring for the receive buffer in order to continuously and easily determine a measure of the currently available bandwidth and adapt the data rate to it.
  • This means in particular that for the playback duration of a main data block, which is firmly defined due to the time dependence of the playback signal, can be optimally used to optimally exploit signal complement data in a correction data stream or according to the invention also several, each further complementary correction data streams , In this case, use is made of the fact that each data block, in particular each main data block with the basic data, is assigned a playback period determined by the playback signal. If the time for receiving the data exceeds the playback time, the level of the receiving buffer decreases. Otherwise he will rise. The receiver can now decide after each received data block due to the time required for loading or past time, whether there is still time to load one or possibly another correction data block within the playing time of this block. This will provide the quality level of the media signal that best matches the current bandwidth.
  • In this respect, it can therefore be provided according to the invention that, during the transmission, an adaptation of the charged signal supplement data takes place as a function of the playback time of the data in relation to their reception duration. The adaptation is made by loading a different number of correction data blocks to the main data block. The number may vary between zero correction frames, if there is no supplemental bandwidth in the transmission channel, up to the number of frames with which the digitized output will result in uncompressed transmission. As a result, uncompressed means that the base data of the main data block is improved by the complementary data addition complement data of the correction data blocks that despite the compression in the main data block and the individual correction data blocks a total uncompressed digitized signal in the receiver for Is available, which can be played back.
  • Accordingly, it can be provided according to the invention that a correction data block is loaded and / or taken into account when the loading time for the main data block and / or possibly proceeding correction data blocks is shorter than the playback time of the playback signal generated by the data block (s). The playback time of a data block is thus defined in accordance with the above explanations by the playback time of the main data block, which is predetermined by the time-correct reproduction of the compressed audio and / or video signal contained in the main data block. The signal supplementation data of the correction data block or also a plurality of iteratively applied successive correction data blocks do not change the playback time of the playback signal, but only influence the reproduction quality within the defined playback time.
  • In this context, it can be provided particularly advantageously that the data receiver itself controls the transmission and / or reception of correction data blocks. This can be done by the data receiver explicitly requesting correction data blocks, timing the data stream of the data transmitter by sending acknowledgment signals (possibly delaying acknowledgment signals to reduce the bandwidth of the data transmitted by the receiver), or an iteration depth of the correction Data blocks is specified. The latter means that, for example, only a first or second of a total of seven or eight possible signal additions takes place corresponding to the respective correction data blocks.
  • In this context, it corresponds to a preferred embodiment of the present invention that a plurality of correction data streams can be provided in a hierarchical structure such that the signal supplementation data of a correction data block of a higher, ie rank lower, hierarchy level, the data of the main data block already by at least one correction Data block of a lower, ie higher hierarchical levels have been added. In other words, the signal complement data of a hierarchy level correction data block complements the signal supplement data of previously received, lower, ie higher ranked, hierarchical levels by incrementally refining or enhancing the playback signal with each additional received hierarchy level of signal supplement data so as to enhance the rendering quality.
  • According to the invention, it can also be provided that the use of correction data blocks depends on a predetermined quality level of the transmission, which can be determined in particular by a threshold value, for example loading time of a data block and / or bandwidth. If necessary, the quality level can be determined by a time averaging or a consideration of the quality levels achieved in the near past and / or a level of fluctuation of the quality levels in the near past. The term "near past" is understood to mean, in particular, a definable period of time which, if appropriate, can also be defined taking into account the movement of the recipient. The time span can easily be determined by a specific number of received data blocks (main and / or correction data blocks). This can also be done, for example, within the scope of a statistic described below.
  • As a result, too frequent changes between the different quality levels of the playback signal are avoided, since these can also be associated with artifacts. In this respect, a kind of hysteresis algorithm is suggested that binds the use of the correction data blocks to a threshold value for reproduction.
  • In this case, for example, a statistic can be kept as to how often the last received data data blocks, the first, second, third, etc. correction data block (i.e., the correction data blocks of a hierarchy level) could also be loaded. The number of considered, last received data blocks is specified. Only if this (for the correction blocks of a hierarchy level) sufficiently often (defined by a threshold value) was the case, the respective correction data blocks from this or up to this hierarchy level are also used for playback, if necessary, regardless of whether this Play time of the recipient are present.
  • In this respect, the playback quality during a playback period is possibly reduced from a maximum possible value to a value which can be achieved permanently in the context of the current transmission quality (seen over the playback period of several time blocks, for example the last 100 time blocks). Insofar, according to the invention, statistics can therefore be kept as to how often in the past, preferably with respect to a predefined number of the last received main data blocks, at least one correction data block could be received for a main data block and taken into account in the generation of the reproduction signal.
  • Instead of querying whether at least one correction data block could be received, a threshold value can also be specified as to which number of hierarchically structured correction data blocks could be received.
  • By evaluating the above-described statistics, it is thus easy to regulate how many correction data blocks are used and / or received or requested. This produces a certain hysteresis effect which avoids continuous quality changes in the playback signal. These could also be interpreted as disturbing by a user.
  • In order to ensure that the transmission of correction data blocks does not hinder the transmission of main data blocks which are absolutely necessary for the generation of a reproduction signal, it can be provided according to the invention that the main data blocks in the transmission are transmitted with a higher priority than the correction data blocks. Additionally or alternatively, by controlling the number of correction frames to be transmitted to a main frame, the receiver may attempt to ensure that at least the main frame is transmitted within the available bandwidth, if the bandwidth is sufficient.
  • The invention also relates to a data receiver for the reception of digital audio and / or video data, in particular integrated in a multimedia unit of a motor vehicle, with a data memory and a computing unit, in particular a processor or equipped with a processor, wherein the computing unit according to the invention by means of the arithmetic unit executable program code means for implementing the method described above or parts thereof is established. Accordingly, the invention also relates to a computer program product with program code means which are suitable, when implemented on a computing unit, to set them up for carrying out the above-described method or parts thereof.
  • Further advantages, features and possible applications of the present invention will become apparent from the following Description of an embodiment and the drawing. All described and / or illustrated features, alone or in any combination form the subject of the present invention, regardless of their summary in the response or their back references. Show it:
  • 1 a schematic representation of a preferred embodiment of the inventive method in which the playback signal is generated from a main data block and a correction data block; and
  • 2 a schematic representation of a preferred embodiment of the method according to the invention, in which the playback signal is generated only from the main data block.
  • Hereinafter, a preferred embodiment of the method for transmitting digital audio and / or video data to a data receiver generating a reproduction signal from the transmitted data will be described by means of a packet-oriented data transmission with reference to the drawing.
  • In 1 are schematically the main data blocks 1 shown consecutively as main data blocks 1 with the numbering n, n + 1, n + 2, n + 3 and so on. Every single main data block 1 of the many main data blocks 1 formed main data stream contains base data I, which are derived as compressed data from an audio and video signal and are used to generate the playback signal W for a certain playback time in which the base data receiving data receiver.
  • The basic data I contains the audio or video signal in a reproducible form, but with a high degree of compression. This strong compression means that the playback signal W is reproduced in a manner that is recognizable to the user and is still acceptable in terms of quality, but that certain quality losses can be detected.
  • After receiving 2 of a main data block I, in 1 Shown in the example of the main data block I (n), the basic data I of the main data block 1 for playback as a playback signal W (n) divided and edited, and then during playback 3 of the reproduced signal W (N) based on the main frame I (n) in the data receiver or a multimedia device connected to the data receiver.
  • During the preparation of the basic data I (n) of the corresponding main data block 1 the data receiver receives further main data blocks 1 with the basic data I (n + 1) etc .. In 1 Here, the basic data I (n + 1), I (n + 2) and I (n + 3) are shown. This basic data I is stored in a receive buffer of the data receiver.
  • From the (temporal) size of the main data block 1 With the basic data I (n) and the associated reproduction signal W (n) (length in each case related to the time stream t), it can be seen that the reception of the basic data I (n) at the in 1 illustrated example over the data transmission channel requires less time than the playback time of the playback signal W (n). As a result, that is due to the sequence of main data blocks 1 symbolized receive memory of the data receiver fills and at the time of playback 3 of the playback signal W (n) already the main data blocks 1 are completely received with the basic data I (n + 1) and I (n + 2). Thus, the data receiver recognizes that at the time of reception 2 of the main data block 1 with the basic data I (n) there is enough bandwidth on the transmission channel to make one out of correction data blocks 4 Receive existing correction data stream, each correction data block 4 Signal complement data K to respective basic data I of a main data block 1 contains. For easy identification of the signal supplementation data K belonging to the basic data I, see 1 the same counting index "n" used.
  • The data receiver, as in 1 Thus, it recognizes that the receive buffer fills and is still sufficiently filled to also receive a correction data stream in addition to the main data stream and to use the signal completion data K (n) received in the correction data stream to obtain the base data I (n) and the supplemented data I (n) + K (n) as the reproduction signal W (n) at the time of reproduction 3 of the playback signal. A criterion suitable for this purpose is, for example, the comparison of the length of the reception of the main data block 1 with the basic data I (n) and the playback time of the associated playback signal W (n), in the drawing respectively represented by the width of the blocks I (n) and W (n).
  • If this is the case, the data receiver starts at the data transmitter, for example a streaming server, which provides the audio and / or video data for playback as a playback signal, the retrieval of a corresponding correction data block 4 with the correction data K (n). This request causes the data transmitter to apply correction data also to the following main data blocks with the basic data I (n + 1), etc. as correction data blocks 4 with the signal supplement data K (n + 1), etc. available so that a corresponding correction data stream is generated.
  • At the request 5 the signal supplement data thus finds a transmission 6 this signal supplementation data K (n) in a correction data block 4 instead of. These signal supplementation data K (n) are also stored in the in 1 in the case represented before the time of the reproduction signal W (n) based on the basic data I (n), so that a reproduced signal W (n) qualitatively improved by the signal supplementation data K (n) can be reproduced as the reproduction signal W (n). The same applies to the reproduction of the further reproduction signals W, as long as the bandwidth of the transmission channel allows the timely transmission of the signal supplementation data K in a main data stream.
  • In contrast, in 2 a situation illustrated in which the signal supplementation data K at the time of playback 3 have not been completely received by the data receiver. This is in 2 Remember that the duration of receiving a main data block 1 This is due to a poorer bandwidth of the transmission channel at the time of transmission of the base data I (n), for example, because the motor vehicle has moved with acting as a data receiver radio receiver to another location at which the mobile data transmission link is qualitatively worse and thus provides only a lower bandwidth.
  • At a request 5 a correction data block 4 Although the data transmitter transmits a corresponding correction data block 4 in a transmission 6 the signal supplement data K (n). However, this becomes in the data receiver only after the time of the reproduction 3 receive the corresponding playback signal W (n) and therefore no longer considered in the playback according to the invention.
  • In addition, in such a case, the data transmitter stops the correction data stream completely around the bandwidth available in the transmission channel for that with the main data blocks 1 transmitted base data I in the main data stream to use. This can be done for example by a response from the data recipient.
  • Such feedback may be initiated when a transmitted correction frame 4 in fact only after the time of playback 3 the corresponding playback signal arrives. Alternatively, the data receiver can already from the reception time of the basic data I (n) in a main data block 1 and the associated playing time during playback 3 of the playback signal W (n) determine that the bandwidth for a correction or signal supplementation of the base signal is not sufficient. This can also be done, for example, by means of a decreasing receive buffer memory of the main data blocks 1 be determined.
  • As soon as the transmission quality and thus the bandwidth in the transmission channel changes, the method according to FIG 1 be switched back.
  • By the method proposed according to the invention, therefore, the best possible audio or video reception quality for the streaming service is available under all reception conditions. If the lowest quality level of the coding with the basic data I is chosen to be sufficiently low, picture or sound interruptions in transmitted audio or video signals can often be avoided. If the precaching of the stream with the lowest quality level is also preceded, the length of time T d for the precaching and thus the duration until the beginning of the reproduction 3 of the playback signal W after receiving the associated basic data I are minimized. Receive buffers may in this case have a smaller memory size, which at the same time reduces the cost and latency of the playback.
  • LIST OF REFERENCE NUMBERS
  • 1
    Main data block
    2
    Receiving a main data block with the basic data I (n)
    3
    Playback of the playback signal based on the basic data I (n)
    4
    Correction data block
    5
    Request signal supplement data
    6
    Transfer signal supplementation data
    I
    Basic data in a main data block
    W
    Playback signal
    K
    Supplementary data signal
    n
    Count index of related base and signal supplement data
    t d
    Duration until the beginning of playback of the playback signal
    W
    after receiving the basic data I
  • QUOTES INCLUDE IN THE DESCRIPTION
  • This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.
  • Cited patent literature
    • WO 98/37698 A1 [0009]
    • WO 2008/082375 A2 [0010]
    • US 2005/0076136 A1 [0011]
    • WO 00/72599 A1 [0012]

Claims (11)

  1. Method for transmitting digital audio and / or video data to a data receiver which generates from the transmitted data a playback signal (W) by means of a packet-oriented data transmission, in which signals to be transmitted are stored as digital data blocks ( 1 . 4 ) are transmitted in a plurality of data streams which form at least one main data stream and one correction data stream with which compressed data blocks ( 1 . 4 ) of the signals are transmitted, the data blocks ( 1 . 4 ) compress the signals to be transmitted in such a way that the main data block transmitted in the main data stream ( 1 ) Contains basic data (I) for generating the reproduction signal (W) for a certain playback time in a reproducible form with a high compression and that the correction data block transmitted in the correction data stream ( 4 ) to a main data block ( 1 ), which comprises the strongly compressed basic data (I) of the main data block (K) 1 to supplement the reproduction quality, characterized in that the signal supplementation data (K) are then used in the generation of the reproduction signal (W) if they have already been transmitted to the receiver at that time, and otherwise the reproduction signal only from those with the main Data block ( 1 ) transmitted basic data (I) is generated.
  2. A method according to claim 1, characterized in that during the reception of at least the main data stream, the bandwidth of the transmission is detected by means of a fill level monitoring of a receiving buffer for the received data.
  3. A method according to claim 2, characterized in that during the transmission of an adaptation of the charged signal supplement data (K) takes place as a function of the playback time of the data in relation to their reception time.
  4. Method according to Claim 3, characterized in that a correction data block ( 4 ) is loaded and / or taken into account when the load time for the main data block ( 1 ) and / or possibly previous correction data blocks ( 4 ) is shorter than the playback time of the generated playback signal (W).
  5. Method according to one of the preceding claims, characterized in that the data receiver transmits and / or receives correction data blocks ( 4 ) controls.
  6. Method according to one of the preceding claims, characterized in that a plurality of correction data streams are provided in a hierarchical arrangement such that the signal supplementation data (K) of a correction data block ( 4 ) of a higher hierarchical level the data of the main data block ( 1 ), which already have at least one correction data block ( 4 ) have been added to a lower hierarchical level.
  7. Method according to one of the preceding claims, characterized in that the use of correction data blocks ( 4 ) depends on a given quality level of the transmission.
  8. A method according to claim 7, characterized in that a statistic is kept, as often in the past to a main data block ( 1 ) at least one correction data block ( 4 ) and / or which number of hierarchically structured correction data blocks ( 4 ) could be received.
  9. Method according to one of the preceding claims, characterized in that the main data blocks ( 1 ) are transmitted in the transmission with a higher priority than the correction data blocks ( 4 ).
  10.  Data receiver for receiving digital audio and / or video data, in particular integrated in a multimedia unit of a motor vehicle, with a data memory and a computing unit, in particular a processor or equipped with a processor, characterized in that the arithmetic unit means executable on the arithmetic unit program code means for implementing the method according to one of claims 1 to 9 is set up.
  11.  Computer program product with program code means which are suitable, when implemented on a computer unit, for setting up the method according to one of Claims 1 to 10.
DE201310220901 2013-10-15 2013-10-15 Method for transmitting digital audio and / or video data Ceased DE102013220901A1 (en)

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