420 results about "Signal compression" patented technology

Disclosed are scalable quantizers for audio and other signals characterized by a non-uniform, perception-based distortion metric, that operate in a common companded domain which includes both the base-layer and one or more enhancement-layers. The common companded domain is designed to permit use of the same unweighted MSE metric for optimal quantization parameter selection in multiple layers, exploiting the statistical dependence of the enhancement-layer signal on the quantization parameters used in the preceding layer. One embodiment features an asymptotically optimal entropy coded uniform scalar quantizer. Another embodiment is an improved bit rate scalable multi-layer Advanced Audio Coder (AAC) which extends the scalability of the asymptotically optimal entropy coded uniform scalar quantizer to systems with non-uniform base-layer quantization, selecting the enhancement-layer quantization methodology to be used in a particular band based on the preceding layer quantization coefficients. In the important case that the source is well modeled as Laplacian, the optimal conditional quantizer is implementable by only two distinct switchable quantizers depending on whether or not the previous quantizer identified the band in question as a so-called "zero dead-zone:" Hence, major savings in bit rate are recouped at virtually no additional computational cost. For example, the proposed four layer scalable coder consisting of 16 kbps layers achieves performance close to a 60 kbps non-scalable coder on the standard test database of 44.1 kHz audio.

Based on the Internet, such as video surveillance methods, the monitoring nodes, the nodes customer service nodes of these three types of nodes based on the existing Internet component video surveillance network, which is a joint monitoring with the video network devices, the digital video signal compression and coding, through the Internet and video data will be sent directly to customers node; customers nodes is a function of a network terminal equipment, directly through network access control node from the video surveillance data show that after the video decoder; service node is a public IP address with the network equipment to assist customers nodes and monitoring network nodes to establish direct links, so as to achieve control nodes directly with the client node data exchange. This invention does away with the existing network video monitoring system in the video server performance bottlenecks, a client node and control nodes, and so on (peer to peer) direct data exchange program, which completely resolve the existing video surveillance technology can not solve the contradiction.