Video compression makes big gains

Article Abstract:

Three standards are under development for digital imaging data compression, which has applications in laser discs, electronic cameras, computers and high definition television. The Joint Photographic Experts Group (JPEG) is developing a still-picture-coding baseline algorithm that uses transform-based image coding. The Consultative Committee on International Telephony and Telegraphy (CCITT) Recommendation H.261 combines transform-based coding with predictive coding to produce a higher compression ratio for video teleconferencing. The Moving Pictures Experts Group (MPEG) is developing standards for full-motion compression on digital storage media including compact disk drives, digital audio tape drives and magnetic hard disks. Many chip sets are being developed for the new standards and digital video applications. The first JPEG solution was available from C-Cube Microsystems; LSI Logic Corp offers H.261 and MPEG products.

Standards, Standard, Standardization, Cover Story, Product development, Movies, Image processing, Data compression, Digital video, Videoconferencing, Image Generation, Image Encoding, Motion Pictures, Transforms, Chip Set, International Telegraph and Telephone Consultative Committee, Huffman Code, Moving Pictures Experts Group, Joint Photographic Experts Group

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Embedding spectral analysis in equipment

Article Abstract:

A variety of real-time spectral analysis technologies have been developed that improve the performance to Fast Fourier transforms (FFTs) while effectively running on the same digital signal-processing (DSP) chips as the FFTs. FFT-based spectral analysis is used in a wide range of applications, such as radar, telecommunications, nondestructive testing, vibrational analysis and remote measurements of physical dimensions. Existing FFT spectrum analysis technologies are generally based on algorithms for estimating power spectral density of sampled signals. Accuracy of a PSD system depends upon the selected rational system function model used to described the digital filters. Autoregressive, moving average and combined models are discussed. The effective use of floating-point DSP processors and applications of spectral analysis are discussed.

Digital signal processors, Modeling, Data modeling software, Signal processing, Products, Applications, Methods, Fast Fourier Transforms, Digital Signal Processor

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Fitting programmable logic: new synthesis software for user-programmable logic relieves designers of complex design fitting, placement, and routing

Article Abstract:

The newest generation of field-programmable gate arrays (FPGAs) and complex programmable logic devices (PLDs) bring capabilities to designers that were previously found only in gate array devices and programmable-array logic (PAL) devices. However, the architectures of the new devices are many and varied. To fully utilize the capabilities of the devices that are now available, synthesis software is needed. New synthesis software functions to manipulate a generic logic description to achieve the best fit with an FPGA or a PLD.

Innovations, Software, Design and construction, Computer-aided design, Computer aided design, Glossary, Gate arrays, Simulation, Logic design

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