Search

A coder-decoder (codec) converts the human voice from analog to digital (encoding) and from digital to analog (decoding). Codecs are now available with programmable features accessible to the microprocessor. This makes them more powerful and versatile. Other advanced features include digital signal processing, subscriber line data link interface, loopback test modes, three-party conferencing, and more. Noise is the most important transmission characteristic to consider, others are gain, frequency response, and distortion. It is important to understand units of measuring noise levels when comparing codecs.

Economical, High-Performance Optical Encoders A HIGH-RESOLUTION, HIGH-SPEED printer like the HP DeskJet printer needs an electronic ruler to know where it is one the page. For this function, the DeskJet […]

Position-control devices are governed by the strict demands of robotic, computer, medical, and other maximum performance electronic-equipment applications. The manufacturers of digital optical encoders are providing smaller components under various guises to improve implementation and use in order to meet user needs. Also, many of the optical encoders now sold are not as expensive as their predecessors. An incremental encoder is a basic component that will produce a repeated signal for equal increments of shaft angle. Sequential Information, Disc Instruments, and Data Technology all sell encoders that are completely assembled.

Disk drives can be designed to offer 50 percent greater storage capacity than drives which implement the industry standard MFM code if the design uses software to define programmable logic devices (PLDs) as run-length-limited (RLL) encode-decode systems. During the decoding process, circuitry is used to RLL 2,7 code patterns with RLL 2,7's seven code strings in order to provide the corresponding decoded data string. Due to the fact that RLL 2,7 code has two bits for every single bit of data, a data clock is produced when the timing circuitry divides the signal for the coded data. The disk drive system has to synchronize with the data clock to ascertain the moment when the data bits begin before it can decode the data on the disk. The circuit will reset and restart the initializing process should the decoder detect a pattern before it finds the address marker.

To ease customer concerns that NetWare 3.11 would fade away after the next release of NetWare, Novell has announced the next version will be NetWare 4.0, not 3.2 as previously […]

Putting correction algorithms on chip Today's ASIC design technologies enable single-chip versions of vital encoder/decoder circuits, which previously required complex and software-intensive board-level design efforts. As storage density and data-transfer [...]

BEI's Industrial Encoder Div., Goleta, Calif. (www.beiied.com), marked a milestone by shipping their 1 millionth optical encoder. The Industrial Encoder Div. (IED), started in 1977 to service the factory-automation industry, [...]

Encoders find increased application in servo control loops Performance requirements of instrumentation and control systems continue to become more demanding to improve production efficiency. Perhaps the most critical requirement is […]

Absolute encoders find increased application Absolute encoders are becoming more popular as technological advancements upgrade new models. Improvements include advanced sealing protection, easier mounting, and lower cost. Due to some […]