Cascadia Digital video recorder Manual de usuario descargar pdf (Pagina 36)

CCTV Glossary

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Time lapse video recording. - The intermittent recording of video signals at intervals to extend the

recording time of the recording medium. It is usually measured in reference to a 3-hr (180-min)

tape.

Time multiplexing. - The technique of recording several cameras onto one time lapse VCR by

sequentially sending camera pictures with a timed interval delay to match the time lapse mode

selected on the recorder.

T-pulse to bar. - A term relating to frequency response of video equipment. A video signal

containing equal amplitude T-pulse and bar portions is passed through the equipment and the

relative amplitudes of the T-pulse and bar are measured at the output. A loss of response is

indicated when one portion of the signal is lower in amplitude than the other.

Tracking. - The angle and speed at which the tape passes the video heads.

Transcoder. - A device that converts one form of encoded video to another, e.g., to convert NTSC

video to PAL. Sometimes mistakenly used to mean translator.

Transducer. - A device that converts one form of energy into another. For example, in fiber optics,

a device that converts light signals into electrical signals.

Translator. - A device used to convert one component set to another, e.g., to convert Y, R-Y, B-Y

signals to RGB signals.

Transponder. - The electronics of a satellite that receives an uplinked signal from the earth,

amplifies it, converts it to a different frequency and returns it to the earth.

TTL. 1. Transistor-transistor logic. - A term used in digital electronics mainly to describe the

ability of a device or circuit to be connected directly to the input or output of digital equipment. Such

compatibility eliminates the need for interfacing circuitry. TTL signals are usually limited to two

states, low and high, and are thus much more limited than analog signals. 2. Thru-the-lens viewing

or color measuring.

Twisted-pair. - A cable composed of two small insulated conductors twisted together. Since both

wires have nearly equal exposure to any interference, the differential noise is slight.

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Cascadia Digital video recorder Manual de usuario Pagina 36