- Industry:
- Number of terms: 20560
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- Company Profile:
Tektronix provides test and measurement instruments, solutions and services for the computer, semiconductor, military/aerospace, consumer electronics and education industries worldwide.
A) The ratio of signal to noise expressed in dB. In general, the higher the signal to noise ratio the better. If there is a low signal-to-noise ratio, the picture can appear grainy, snowy, and sparkles of colour may be noticeable. Equipment will not be able to synchronise to extremely noisy signals. b) It may not be possible to directly compare SNRs for ATV and for NTSC as the eye’s sensitivity to noise varies with the detail of the noise. c) The measurement of the dynamic range of a piece of equipment, measuring from the noise floor (internally generated noise) to the normal operating level or the level prior to limiting.
Industry:Software
The maximum video signal excursion in the white direction permitted by the system.
Industry:Software
When the studio and distribution standard are identical, and/or programme urgency is great, simplified post-production is frequently conducted with all programme segment decisions made in real-time review. For such applications, the programme is usually in distribution or emission/transmission format.
Industry:Software
A compression scheme. A run of pixels or bytes of the same colour or value are coded as a single value recording the colour or byte value and the number of duplications in the run.
Industry:Software
Code-words that may be inserted into the compressed bit stream that are discarded in the decoding process.
Their purpose is to increase the bit rate of the stream.
Industry:Software
A dedicated ISO keyer on the Vista switcher for use of a digital effects unit or character generator.
Industry:Software
A compressor compatible with Indeo video interactive that handles data more quickly than the offline compressor. Videos that compress in hours can take minutes using the quick compressor. Compare Offline Encoder.
Industry:Software
A type of scalability where the enhancement layer(s) contain only coded refinement data for the DCT coefficients of the base layer. SNR scalability is aimed at transmission in noisy environments, and offers a form of graceful degradation. Under poor reception conditions, only the lower layer (which is covered by the highest error protection) is decoded.
The picture quality is then not the best, of course, but at least a picture is available. The alternative is a total loss of picture (the “brick wall” effect) below a certain SNR. The lower layer and the enhancement layer operate with the same resolution, but the enhancement layer may contain the higher frequencies of the picture.
Industry:Software
A) A visual defect that occurs when the image being sampled moves too fast for the sampling rate. A common example is waggon wheels that appear to rotate backwards. b) An alias caused by violation of the Nyquist limit on sampling in time with frames.
Industry:Software
A) Amplitude compression of the signals corresponding to the white regions of the picture, thus modifying the tonal gradient.
b) The reduction in gain applied to a picture signal at those levels corresponding to light areas in the picture, with respect to the gain at the level corresponding to the midrange light value in the picture. Note: The gain referred to in the definition is for a signal amplitude small in comparison with the total peak-to-peak picture signal involved. A quantitative evaluation of this effect can be obtained by a measurement of differential gain.
The overall effect of white compression beyond bandwidth limiting is to reduce contrast in the highlights of the picture as seen on a monitor.
Industry:Software
