By Frederick Wilkinson
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This article is quantity I of a five-volume reference paintings that surveys the whole literature on legislations and economics. The entries include parts: a assessment of the literature via an expert within the box and a bibliography which covers lots of the released fabric within the specific sector.
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- Standard Catalog of Military Firearms
- Guide Book of United States Coins
- German Army Uniforms: Heer 1933-1945
- Encyclopedia of Statistical Sciences
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In our simple example a word consists of four bits. 2 shows a typical quantization stage characteristic. In fact, quantization can be regarded as a mechanism in which some information is thrown away, keeping only as much as necessary to retain a required accuracy (or fidelity) in an application. Quantization Error By definition, because all voltages in a certain quantization interval are represented by the voltage at the centre of this interval, the process of quantization is a non-linear process and creates an error, called quantization error (or, sometimes, round-off error).
Differential PCM, in fact, is a special type of predictive encoding. In such encoding schemes, a prediction is generated for the current sample, based upon past data; the correcting signal is simply the difference between the prediction and the actual signal. As sampling rate increases, the differences between previous and present samples become smaller, so that, in the extreme for very high sampling rates, only 1 bit is needed for the error signal to indicate the sign of the error; in this case we talk about delta modulation.
Thus, for a 1MHz clock, a 12-bit converter would take 12 ^s to convert an applied analog signal. A successive approximation converter consists of a comparator, a register, control logic and a D/A converter. 3). Each bit line in the D/A converter corresponds to a bit position in the register. Initially, the converter is clear. When an input signal is applied the control logic instructs the register to change its MSB to 1. This is changed by the D/A converter to an analog voltage equivalent to one-half the converter's full-scale range.