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By M. A. Perry

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11 is self-explanatory. The frequency is swept from the voltage controlled local oscillator which can provide " c o " and " q u a d " phased outputs. Since the modulators are all referenced to the local oscillators the effective centre frequencies of the filters all correspond exactly νατΑοε RAMP GENERATOR LOCAL OSCILLATOR pnl 0· PHASE FREQUENCY TO VOUAQE I X-Y A(t)—4TCAMPLI F I E M — r - H MODULATOR RECORDER X-Y RECORDER A(waw)9o MODULATOR B(t)- X-Y FILTER RECORDB? SMOOTHER MULTIPLER MODULATOR FILTER X-Y RECORDER A|w)B{w\ / I A ( w ) B ( w g ^ lA(w)B(wJ9^1 FIG.

If, however, the scan rate is reduced to a figure of 1 cps/s and the time constant increased to 5 s a more consistent result is obtained (Fig. 9), in accordance with recognizing that it is the bandwidth of the process which controls the variance in such a case. In the second type of narrow band problem, the details of the spectrum shape are of 44 R. LAWSON AND A. M. STONE importance, for example, one may wish to examine in detail a narrow band filter shape. In Fig. 10 the filter characteristics of an audio-analyser are plotted.

The following decisions are then taken for the initial analysis. 1. The frequency band for analysis is selected. 2. The spectrum resolution required is estimated and the appropriate filter selected. 3. The appropriate averaging time constant is selected. 4. The maximum sweep rate is determined from 2 and 3 and (a). 38 R. LAWSON AND A. M. STONE Having taken these decisions the analysis is commenced and an experienced operator will soon detect whether or not the processing has been optimized for the problem in hand.

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