For each digital value, a voltage is chosen and the output signal's voltage is adjusted to that new voltage. The next digital value then results in another voltage. The resulting signal is a step like signal with sudden transitions from one voltage to another. It looks much like a Bar graph. Due to these sudden transitions, the resulting analog signal has unwanted high frequency components.
Further action is required to filter and integrate these samples to obtain a continuous approximation of the original signal, because analog decoding does not smooth the signal.
There are many methods to do analog decoding. Note that the term itself does not in any way specify the resulting voltage range, nor if the relationship between the input digital values and the resulting analog voltages is linear or has some other relationship.
Analog is usually thought of in an electrical context, however mechanical, pneumatic, hydraulic, and other systems may also use analog signals.
Most analog multiplier circuits are incorporated into integrated circuits designed for specific application functions, such as a True RMS converter When measuring the value of an alternating current signal it is often necessary to convert the signal into a direct current signal of equivalent value (known as the RMS, Root Mean square, value).
Analog Computer An analog/analogue computer is a form of computer that uses electronic or mechanical phenomena to model the problem being solved by using one kind of physical quantity to represent another.
This analog approach is well known in the art and is susceptible to all of the disadvantages inherent with analog signal processing such, problems with noise, drift with temperature, and overall circuit complexity.
One digitaldecoding approach which overcomes the disadvantages inherent with analogdecoding circuitry involves converting from the analog to the digital domain the composite FM stereo signal output from the FM discriminator.
To decode the digitized composite signal, the phase angle between the sampling frequency and the carrier and pilot signals is calculated.
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