An Introduction to Video and Audio Measurement by Peter Hodges

By Peter Hodges

What can we degree and why? Peter Hodges explains the reply to this question in approachable language and with transparent illustrations. novices to the video undefined, in addition to these already tested, will locate this uniquely readable consultant to the fundamentals of a posh topic. construction at the good fortune of the 2 prior versions of this well known name and masking either analog and electronic video, the 3rd variation contains new sections on audio size, excessive definition video, and leading edge innovations of attempt and dimension.

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2 Additive colour. The ramp test signal is sent to the three colour channels of a picture display and produces continuous variation of grey tone. 60 Adding colour The video standard states that when all the colour signals have the same level the result is grey. Therefore: when R = B = G = 0 the result is black when R = B = G = 100% the result is white when xR + xB + xG = XY where XY is the equivalent luminance, or grey, value. Where the scene has only one colour present, say, red, neither green nor blue will be present.

1 cm are usually added. 4 Terms in common usage. The line blanking period contains the line sync pulse, with back and front porches. The porches also represent video black level that separates the sync period from the picture. The line period may be measured between any two similar points, but it is usual to measure from leading edge to leading edge, of line sync. 44 Measuring video Black level Chapter 3 made reference to ‘black’; that value in the picture where no light leaves the screen. We must now define this more carefully for it is crucial that the picture display knows exactly what this value really is.

10 Ramp waveform and line sync pulses. Line sync pulses are inserted below black level in the blanked portion of the line and are therefore quite separate from the actual picture signal. They take the form of unseen voltage pulses outside the picture area and below black. Electronics and video make unreal concepts, such as blacker than black, perfectly possible when actual voltage values are added to the waveform. NA picture period line / white level. OV. OV. The picture, however, always occupies 70% of the waveform and the sync 30%.

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