- Industrie:
- Number of terms: 20560
- Number of blossaries: 0
- Company Profile:
Tektronix provides test and measurement instruments, solutions and services for the computer, semiconductor, military/aerospace, consumer electronics and education industries worldwide.
Nearly identical to HSI and HSL except Intensity and Lightness are called Value. All three serve the same function.
Industry:Software
Method of data compression that is independent of the data type, i.e., the data could represent an image, audio, or spread sheet.
This compression scheme is used in JPEG and MPEG-2. Huffman Coding works by looking at the data stream that makes up the file to be compressed.
Those data bytes that occur most often are assigned a small code to represent them (certainly smaller than the data bytes being represented).
Data bytes that occur the next most often have a slightly larger code to represent them. This continues until all of the unique pieces of data are assigned unique code words. For a given character distribution, by assigning short codes to frequently occurring characters and longer codes to infrequently occurring characters, Huffman’s minimum redundancy encoding minimises the average number of bytes required to represent the characters in a text. Static Huffman encoding uses a fixed set of codes, based on a representative sample of data, for processing texts. Although encoding is achieved in a single pass, the data on which the compression is based may bear little resemblance to the actual text being compressed. Dynamic Huffman encoding, on the other hand, reads each text twice; once to determine the frequency distribution of the characters in the text and once to encode the data. The codes used for compression are computed on the basis of the statistics gathered during the first pass with compressed texts being prefixed by a copy of the Huffman encoding table for use with the decoding process. By using a single-pass technique, where each character is encoded on the basis of the preceding characters in a text, Gallager’s adaptive Huffman encoding avoids many of the problems associated with either the static or dynamic method.
Industry:Software
This type of smooth shading has no true “specular” highlights and is faster and cheaper than Phong shading (which does).
Industry:Software
Undesirable coupling of 50 Hz (PAL) or 60 Hz (NTSC) power sine wave into other electrical signals.
Industry:Software
The United States grouping, formed in May 1993, to produce “the best of the best” initially proposed HDTV systems. The participants are: AT&T, General Instrument Corporation, Massachusetts Institute of Technology, Philips Consumer Electronics, David Sarnoff Research Center, Thomson Consumer Electronics, and Zenith Electronics Corporation. The format proposed is known as the ATSC format.
Industry:Software
A set of standards and suggestions for making the working environment more comfortable and healthy.
Industry:Software
This ITU recommendation defines an 8-bit A-law (European companding) and μ-law (American companding) PCM audio format with 8 kHz sampling used in standard telephony. G.711 audio is also used in H.320 videoconferencing.
Industry:Software
An ITU-T recommendation which embraces 7 kHz audio coding at 64 kbit/s. G.722 uses an adaptive differential PCM (ADPCM) algorithm in two sub-bands, and is widely used for news and sports commentary links.
The sound quality is normally considered inferior compared to MPEG audio coding, but has the advantage of low coding delay in comparison with MPEG. Due to the low delay, and because of the large installed base of G.722 equipment, the algorithm will continue to be in service.
Industry:Software
This ITU-T recommendation is entitled “40, 32, 24, 16 kbit/s adaptive differential pulse code modulation (ADPCM).” It defines the conversion between 64 kbit/s A-law or μ-law PCM audio and a channel of the rates stated in the title, by using ADPCM transcoding.
Industry:Software
