NEGATIVE EFFECT
NF
NICAM
NOISE
NOISE GATE
NOISE REDUCTION
NONLINEARITY
NRZ/NRZI
NTSC (National Television Standards Committee)
NYQUIST FREQUENCY
NEGATIVE EFFECT
The conversion of a video picture to a negative image. Black and white are reversed and colors are inverted. Red becomes a bluish tint and green becomes purple, etc. This is a typical special effect integrated into the some special effects generators or video cameras. Negative effect is also used to generate electronic color slides from color negatives. An electronic color filter is used for the fine adjustment of the hues.
0

NF
Noise Figure. A term used to measure and evaluate noise in various electronic systems such as amplifiers and processors. NF is the ratio between the input noise power and the output noise power of an amplifier, or an amplification stage in a more complex system.
0

NICAM
Nicam (728) stands for Near Instantaneous Companded Audio Multiplex, and is a system initially developed and adopted by the British BBC for Stereo TV transmissions. The system is being used now in most countries in Europe, and may become the standard in stereo TV transmissions. Audio information is digitally coded and transmitted alongside the video information, allowing mono sound reception in receivers not equipped with the NICAM system (down compatibility). A NICAM TV receiver is equipped with a decoder which converts the coded digital information into two stereo, analog sound channels.
0

NOISE
(рус. Шум)
A general term used in electronics to indicate any unwanted electrical disturbance or random signal, unrelated to the signal being processed and tending to modify it. Electronic noise may be the result of several factors: electrical currents and voltages randomly triggered in an electronic device by temperature and voltage applied to the device, avalanches of voltages in an imperfect chip, noise induced by external interfering sources such as the national power-line grid, electric motors, fluorescent lamps, etc. In the digital domain, noise is related to improper digitization processes, poor signal handling, exaggerated signal compression and incompatible signal logic levels.
0

NOISE GATE
Sophisticated circuitry, for discrimination between unwanted low energy noise signals and the \''real\'' signal being processed. Noise gates and automatic noise gates are integrated into high quality processing devices.
0

NOISE REDUCTION
An electronic process used to reduce noise level in audio and video. It can be performed either before or after recording. An encoding/decoding system, such as the Dolby noise reduction system, is used before recording. Noise reduction can be performed on an existing tape using DNR (dynamic noise reduction). In professional video production, the most effective means of noise reduction is by digitizing the video image and carrying out a computerized pixel by pixel analysis of the data. In this way most of the noise elements can be discarded.
0

NONLINEARITY
The amount by which the video output signal, when subjected to any load within its capacity, differs from an ideally linear output. The greater the deviance, the greater the distortion of the video signal, resulting in both black and white and color problems. All good amplifiers /processing devices are designed to contend with nonlinearity.
0

NRZ/NRZI
Non Return to Zero (NRZ) is a digital coding system used in RS-232 serial data links. This coding system is polarity sensitive. Non Return to Zero Inverse (NRZI) is a coding system which is insensitive to signal polarity. In this system, low signal levels mean no change in logical levels, and high signal levels represent a logic change from \''0\'' to \''1\'' or vice versa. The NRZI system is more immune to interference and is widely used in digital systems, like SDI.
0

NTSC (National Television Standards Committee)
Standard of color telecasting used in the United States and Japan, which takes its name from the American committee, which formulated it. The NTSC standard has the advantage of simplicity but there are several major drawbacks to its use such as limited video bandwidth which affects picture sharpness and faithfulness of colors.
0

NYQUIST FREQUENCY
The minimum frequency at which a signal may be digitally sampled, in order to allow for faithful reproduction. The Niquist criteria stipulates that sampling must be done at least at double the highest frequency available in the sampled signal. In practice, slightly higher than the Nyquist sampling frequency - or even over-sampling - is usually used.
0

Логин:
Пароль:
Контакты | ISO | Гарантия | Обработка персональных данных
Copyright © Kramer Electronics LTD. 1981—2017.
Yandex.Metrica