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    • 92. 发明公开
    • Statistical multiplexing
    • Statischer多路复用器
    • EP0759667A2
    • 1997-02-26
    • EP96305955.5
    • 1996-08-14
    • DIGI-MEDIA VISION LIMITED
    • Budge, Michael Richard JosephJagger, Jonathan Rodney BullStedman, Robert Julian
    • H04J3/16H04N7/58
    • H04N21/4347H04J3/1688H04N19/115H04N19/146H04N19/152H04N19/154H04N19/172H04N19/182H04N19/61H04N21/234354H04N21/2365H04N21/23655H04N21/2385
    • The present invention relates to a transmitter for transmitting a plurality of digital signals through a plurality of channels, the channels having a predetermined total bitrate allocated to them, comprising a plurality of encoders one associated with each channel; a multiplexer for receiving the encoded digital signal and transmitting them as a stream of data and capable of adjusting the distribution of the bitrate allocation between the encoded signals; and processing means for providing an indication of a target quality and an actual quality for each channel and causing the multiplexer to repeatedly adjust the distribution of the bitrate allocation in response to differences between the indicated actual quality and the indicated target quality for each channel so as to tend to equalise the difference between the actual and target quality across some or all of the channels.
      In principle, by grouping encoders together in what will be termed herein "statistical multiplex groups", and making real time decisions about the bitrate requirements for those encoders, bitrate can be allocated to maximise picture quality for the group. The theory is that for a variety of different picture sources in a statistical multiplex grouping, to achieve a target picture quality the bitrate requirements of each will vary with coding difficulty. Thus a channel within the statistical multiplex group that is experiencing little difficulty in encoding its picture can free bits to channels that are having greater difficulty. The effect is to smooth the picture quality and to subjectively improve it.
    • 本发明涉及一种用于通过多个信道发送多个数字信号的发射机,所述信道具有分配给它们的预定总比特率,包括与每个信道相关联的多个编码器; 多路复用器,用于接收编码数字信号并将其作为数据流发送并且能够调整编码信号之间的比特率分配的分布; 以及处理装置,用于提供针对每个信道的目标质量和实际质量的指示,并且使多路复用器响应于指示的实际质量与每个频道的指示目标质量之间的差异重复地调整比特率分配的分布,以便 倾向于平衡部分或所有渠道的实际和目标质量之间的差异。 原则上,通过将编码器分组在这里将被称为“统计多路复用组”,并对这些编码器的比特率要求做出实时决定,可以分配比特率以最大化该组的图像质量。 理论是针对统计多路分组中的各种不同的图像源,为了实现目标图像质量,每个的比特率要求将随着编码难度而变化。 因此,在对其图像进行编码时几乎没有困难的统计多路复用组内的信道可以对具有更大困难的信道进行空闲比特。 效果是平滑画面质量,主观改善。