quad-speed CD-ROM drive
A CD-ROM drive designed to run four times as fast as original models. Often denoted as 4X CD players, they provide data transfer rates of 600K per second and data access times as low as 125 milliseconds (ms).
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- quadraphonic sound
Quadraphonic sound uses four channels to output sound; right front, left front, right rear, and left rear. The goal of a quadraphonic sound system is to reproduce sounds in both the front and back of the listener, which simulates 360-degree sound. Quadraphonic sound became the more common and popular choice in the late 1950s to […]
- quality backlink
In search engine optimization (SEO) terminology, a quality backlink is a backlink that links to your Web site using your keywords or keyword phrase, and also appears on a Web site that has the same theme or similar content topic as your own Web site.
- quantization
The process of converting, or digitizing, the almost infinitely variable amplitude of an analog waveform to one of a finite series of discrete levels. In video compression, quantization is a process that attempts to determine what information can be discarded safely without a significant loss in visual fidelity. The quantization process is inherently lossy because […]
- quantize
A lossless encoding process where a value or range of values is converted into smaller values or ranges by using integer division. The values are converted back by multiplying. However, when converting back the values may be close to the original but not exactly the same.
- quantize matrix
The 8×8 blocks of numbers used by the encoder to perform the best optimization for the appropriate video format. Quantization matrices are used to decide how accurately the frequencies present in the image need to be represented. Lower frequencies use lower quantization and produce a higher accuracy.