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视音频专业术语表

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视音频专业术语表(17)

2017-02-13 09:15 admin 人关注

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Q
Q-factor (Quality factor) - A measure of the “quality” of a resonant system. Resonant systems respond to frequencies close to the natural frequency much more strongly than they respond to other frequencies. On a graph of response versus frequency, the bandwidth is defined as the 3 dB change in level besides the center frequency.
QoS - Quality of service. Performance, such as transmission rates and error rates, of a communications channel or system. A suite of features that configure queuing and scheduling on the forwarding path of an E-Series router. QoS provides a level of predictability and control beyond the best-effort delivery that the router provides by default. (Best-effort service provides packet transmission with no assurance of reliability, delay, jitter, or throughput.). Also see "CoS."
QS-FPC™ - QuickSwitch Front Panel Controller. This is a front panel controller on Extron matrix switchers. The panel allows easy set up and control of the matrix switchers through a series of buttons on the front panel.
Quad standard - A term used for video products that are compatible with the following four standards: NTSC 3.58, NTSC 4.43, SECAM, and PAL.
Quantization - The process of sampling an analog signal to convert its values into digital data.
Quantizing error - Inaccuracies in the digital representation of an analog signal. These errors occur as a result of limitations in the resolution of the digitizing process.
Quantizing noise - The noise (deviation of a signal from its original or correct value) that results from the quantization process. In serial digital video, it is a granular type of noise that occurs only in the presence of a signal.
QUXGA - Quad UXGA, a computer resolution of 3200 x 2400 pixels (four times 1600 x 1200)
QXGA - Quantum extended graphics array. A graphics standard with 2048 x 1536 pixels.
 

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