Research of multimedia integrated broadcast method base on application of unused bandwidth by compression variances

在视频压缩中，所需的带宽取决于场景的特性。当可用带宽像无线电广播一样保持恒定时，即使它执行缓冲，也会留下无用的时区。这一无用带宽适用于轮转式数据广播、点播等。研究了这种非流类型数据的利用方法和调度算法。本研究的目的是寻找最优的多媒体广播调度算法，为实际应用提供参考。我们是从这些观点出发进行研究的。首先，我们测量了各种视频的最大带宽和平均带宽，并观察了左带是如何出现的。我们考察了无用带宽缓冲时延与必要带宽平滑之间的关系，找出了这种关系的特点。接下来，如果假设轮播类型的数据广播是未使用的频带与流类型的数据广播的使用，则我们研究…当所提供的带宽平坦时，更多的Ched最优广播调度与最优调度相比较。结果表明，在提供平带大小的情况下，所使用的调度方法应该从最优调度改变。此外，还有一个问题，当视频服务器输出广播数据时，无用的带宽不清楚它被压缩到了多少。我们研究了解决此问题的两种方法。一种是在视频传输定时时仅延迟1个测量单位的方法。通过这种方法可以正确地测量未使用的带宽。另一种是根据过去所需带宽的变化来预测下一时刻所需带宽的方法。当前者用于体育转播等单向图像输出时，可以判断1个测量时间单位的延迟问题不大。当采用后者的方法传输带宽要求波动较大的视频时，预测带宽的估计误差较大。然而，当带宽变化不大时，如会议，预测是比较准确的，适合实际使用。作为一个应用实例，我以多媒体记录的操作为例，研究了一个应用程序的保护方法。较少

In video compression, the necessary bandwidth differs depend upon characteristics of the scene. When an available bandwidth is constant like radio broadcasting, useless time zones are left, even if it performs buffering. This useless bandwidth is applicable to carousel-type data broadcasting, on demand broadcasting and so on. We researched the utilization method of this non-stream type data and the scheduling algorism. The goal of the research was to discover the optimal multi-media broadcast scheduling algorithm and to offer the practical use. We started research from these viewpoints. At first, we measured the maximum bandwidth and the average bandwidth with various videos, and observed how to occur the left band. We examined the relationship of the delay by buffering of useless band between the smoothing of necessary band, and found out the characteristic. Next, if carousel type data broadcasting was assumed as a usage of the unused band with stream type data broadcasting, we resear … More ched optimal broadcast scheduling to compare with the optimal scheduling when supplied band is flat. As a result, it is cleared that used scheduling method should be changed from the optimal scheduling when flat band size is supplied. In addition, there was an issue that a useless bandwidth was unclear how much it was compressed to when the video server output broadcast data. We examined two methods for this solution. One is the method of delaying only 1 measurement unit at the time of video transmission timing. The unused bandwidth is correctly measurable by this method. Another is the method of predicting the required bandwidth of the following timing from change of the past required bandwidth. When the method of former is used for unidirectional image output like sport relay, it could judge that the delay of 1 measurement time unit is not big problem. When the method of latter is used for the transmission of the video with a large fluctuation of required bandwidth, the estimate error of predicted bandwidth is large. However, when there is little change of bandwidth like a meeting, the prediction is comparatively accurate and suitable for practical use. As an applied example, I took up manipulation of multi-Media record for an example and examined a protect method of an application. Less