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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 hypothetical decoder that is conceptually connected to the output of the encoder. Its purpose is to provide a constraint on the variability of the data rate that an encoder or editing process may produce (ISO13818-2 Annex C). This postulates the existence of a buffer in the receiver and a prediction mechanism in the encoder. This mechanism will predict the buffer fullness due to the constant fill from the constant bit rate (CBR) stream and the variable empty due to the variation in decoder bit demand. This latter factor can be controlled at the encoder by varying the quality of the encoding process (quantization factor, mainly).
Industry:Software
The change in gain (amplitude) of the color burst signal relative to the gain (amplitude) of the chrominance subcarrier, in the active line time, caused by processing the video signal.
Industry:Software
A synchronizing generator on a module that is used to adjust the timing of a specific piece of source equipment. It is kept in time by a reference sync pulse generator.
Industry:Software
Ready to use for transmission or videotaping, this is the PGM output.
Industry:Software
The erasure of high frequencies which occurs during recording due to the formation of a secondary gap after the trailing edge of the record head. Self-erasure is increased by excess bias and by excess high-frequency signal levels (especially at low tape speeds).
Industry:Software
Equipment that generates synchronizing pulses needed by source equipment. Also called sync generator or SPG.
Industry:Software
A camera which contains an electronic image sensor rather than photographic film. The lens focuses an image on an electronic tube or CCD chip. A camera has electronic circuitry which generates color and sync pulses. Most portable consumer cameras are equipped with a full complement of audio circuitry, e.g., microphone, audio amplifier, and additional audio electronics. In order to obtain better quality images, a professional camera has three tubes or a triple CCD system, one for each basic color. Most professional cameras have a genlock input, which allows the camera to be synchronized to an external source. Some cameras also include basic character generators for titling purposes.
Industry:Software
