By Peter Hodges
What will we degree and why? Peter Hodges explains the reply to this query in approachable language and with transparent illustrations. beginners to the video undefined, in addition to these already verified, will locate this uniquely readable consultant to the fundamentals of a fancy topic. construction at the luck of the 2 prior variants of this well known name and protecting either analog and electronic video, the 3rd version comprises new sections on audio dimension, excessive definition video, and cutting edge recommendations of try and dimension.
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Extra info for An Introduction to Video and Audio Measurement
When time synchronism is to be measured we must choose one of the cameras to be master and compare the timing position of the other to it. It is the latter situation that provides the WFM with a large part of its duties. Signal time values are standard and as such are designed into the picture generating equipment, whatever that may be. Such parameters are unlikely to vary unless a fault condition arises. On the other hand, synchronism is a system feature, with operational requirements. g. 10 The complete waveform monitor.
9 Positioning the signal against the graticule. Shift controls are additive inputs to the deflection amplifiers that allow variable DC (positive or negative) to be added to both the signal and timebase deflection drives. They make the display position adjustable against the graticule. produce signals in synchronism. If not, then, as the switcher cuts or mixes the two pictures, confusing synchronising information will be sent out. We have already seen the importance attached to the signal’s sync pulses.
Signals take specific times to pass through systems and where these time delays, as they are called, are altered, we get signals arriving out of sync. Remember, that video is a time-based system. The implications of this will be gone into later. Video is generated and sent as a voltage; we therefore require a voltmeter to measure it. Voltmeters are usually associated with steady-state conditions 42 Measuring video but video is not steady state. It is a constantly varying signal derived from a scanned picture.