This paper introduces a new HDTV coder based on motion compensation, subband codling, and high order conditional entropy coding. The proposed coder exploits the temporal and spatial statistical dependencies inherent in the HDTV signal by using intraand inter-subband conditioning for coding both the motion coordinates and the residual signal. The new framework provides an easy way to control the...

| Model-based video synthesis is combined with block-based motion-compensated video coding for rate-distortion eecient transmission of head-and-shoulder sequences. Two frames are utilized for block-based motion-compensated prediction of the current video frame where one frame is the previously reconstructed one and the other frame is provided by a model-based coder. The model-based coder uses a...

The paper deals with an efficient coder structure being appropriate for scalable coding of video. The coder consists of two motion-compensated hybrid coders with independent motion estimation and compensation. The structure implements spatial scalability or mixed spatial and temporal scalability that can be combined with fine granular SNR scalability. The encoder exhibits extended capabilities ...

Due to high data rates and limited bandwidth as well as limited battery power, wireless multimedia communications systems must be optimized in every possible way. We develop a generic matching scheme for wireless image and video communication in which the three most significant components: the source coder, the channel coder, and hardware power consumption, are jointly optimized. That is, we ma...

The reconstructed speech quality in a low bit-rate CELP coder is very dependent on the performance of the pitch filter. In this paper, we present an improved pitch filter, a fractional pseudethree-tap pitch synthesis filter, which performs better than a conventional one-tap pitch filter. We discuss the frequency response of the improved pitch filter. We explore stability issues for three-tap pi...

Real-time audio and video data streamed over unreliable IP networks, such as the Internet, may encounter losses due to dropped packets or late arrivals. This paper reviews error-concealment schemes developed for streaming realtime audio and video data over the Internet. Based on their interactions with (video or audio) source coders, we classify existing techniques into source coder-independent...

The CAUSAL, RESTART and RESET mode switches, previously used to enable microscopic parallelism and improve throughput, are examined in terms of the memory requirements of the JPEG2000 block coder. An Extended Pass Switching Arithmetic Encoder (EPSAE) is introduced that aids in the reduction of memory by providing the ability to partially process code-blocks. We show how the use of these switche...

Advances in speech coding technologies have enabled speech coders to achieve bit-rate reductions at a great extent while maintaining roughly the same speech quality. One of the most important driving forces behind this feat is the analysis-by-synthesis paradigm. Code Excited Linear Predictive coder (CELP) is the quite efficient closed loop analysis-by-synthesis method for narrow and medium band...