Analogue to digital conversion

Since the detection methodology was based on the deceleration of a large mass, early in the development it was typically defined that the frequency bandwidth of interest should be less than 400 Hz. This low bandwidth would reduce the need to perform extremely fast A/D (analogue to digital) conversions and mathematical calculations that would be needed to follow the higher frequency components of a crash signal. 

The analogue to digital conversion of the profile is usually a tedious manual task. However, transient recorders have recently become available as a commercial item [3]. The replacement of the oscilloscope with two Biomation Model 610 B units interfaced to a teletype and coupled to a... 

Many standard books explain the analogue to digital conversion process, for instance see Rabiner and Schafer [368]. 

As the final spectrophotometer reading (represented either by recorder pen deflection or by a digital value read into the computer from the ADC) is calibrated against standard concentrations, no calibration procedures are required to produce exact absolute absorbance outputs and absolute analogue to digital conversion. Any arbitrary signal output is acceptable as long as it is linearly related to the absorbance. 

Perform analogue-to-digital conversion of the selected signal and store the digitized data in an array in computer memory... 

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