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- Number of terms: 20560
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Tektronix provides test and measurement instruments, solutions and services for the computer, semiconductor, military/aerospace, consumer electronics and education industries worldwide.
A scanning process in which the distance from center to center of successively scanned lines is two or more times the nominal line width, and in which the adjacent lines belong to different fields. For a given number of active vertical lines per frame, and a given frame-rate, interlaced scanning provides system-limited definition for still images. Moving images, however, provide reduced perceived spatial definition.
Although the interlaced scanning field-rate at a multiple of the framerate could improve temporal resolution, this is seldom perceived. When scanning interlaced 2:1 in either capture or display mode, the lines constituting one frame of the image are scanned and/or presented in two successive fields one-half the lines in one field and the other half interleaved as the following field. In a system based upon a nominal 60 Hz, for example, the generation and presentation of the two fields in succession require a total of 1/30 sec per frame, with a continual temporal progression from start to finish of the scanning. Note: Interlaced scanning may be introduced in the original scanning for image capture, or may be developed from progressive scanning of the original.
Industry:Software
a) The final combining and enhancing of a video program’s audio tracks. b) Electronically improving the quality of an audio or video signal, such as by adding sound effects, laugh tracks, and captions.
Industry:Software
A pulse at field rate used in TV cameras. Its leading edge is coincident with the leading edge of the vertical blanking pulse and its duration may be 10.5 lines.
Industry:Software
An indicator that responds to short transient signals, often used to supplement Recording Level Meters which usually indicate average signal levels.
Industry:Software
An indicator on a tape recorder that provides some idea of the signal levels being applied to the tape from moment to moment. It is intended as an aid in setting the recording levels.
Industry:Software
Operating instructions loaded into computer memory from disk that controls how system hardware will execute its operation. See Programs.
Industry:Software
A term that indicates the time of a specific action such as the arrival of a byte or the presentation of a presentation unit.
Industry:Software
a) The tilt of the head relative to a direction perpendicular to the tape travel. b) Major U.S. consumer electronics manufacturer and proponent of the 3XNTSC ATV scheme, also possibly the first organization to suggest pre-combing for NTSC.
Industry:Software
a) A rectilinear scanning process in which the distance from center to center of successively scanned lines is equal to the nominal line width. b) A display mode for electronic imaging in which all of the scanned lines are presented successively, and each field has the same number of lines as a frame. Also known as sequential scanning. For a given number of active vertical lines per frame, and a given frame rate, progressive scanning requires the same bandwidth as interlaced scanning.
When compared at a given field rate, progressive scanning requires twice the bandwidth of 2:1 interlaced scanning. Note: Most image processing in electronic post-production requires that a progressive scanned image first be captured or created. The image information may have originated in progressive scanning, or it may have been interpolated from an origination in interlaced scanning.
Industry:Software
General term for a device used to select different signals (audio, video, or RF) from various sources. See Video Switcher.
Industry:Software
