Most with the signals encountered in science and engineering are analog in nature. That is certainly the signals are functions of a continuous variable, these kinds of as time or space, and usually get on values inside a continuous range. This sort of alerts may be processed directly by appropriate analog programs (this kind of as filters or frequency analyzers) or frequency multipliers for the purpose of changing their characteristics or extracting some desired data. In these types of a case we say the sign has been processed directly in its analog form, as illustrated in picture under.
Both the input sign and the output signal are in analog form.
Electronic sign processing offers an alternative method for processing the analog signal, as illustrated in determine down below.
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To perform the processing digitally, there is a need for an interface between the analog signal and the digital processor. This interface is called an analog-to-digital (A/D) converter. The output with the A?D converter is usually a digital signal which is appropriate as an enter into the digital processor.
The electronic signal processor may be a large programmable electronic computer or a small microprocessor programmed to perform the desired operations about the input sign. It may also be a hardwired digital processor configured to perform a specified set of operations to the input signal. Programmable machines provide the adaptability to change the signal processing operations by a change inside the software program, while hardwired machines are tricky to reconfigure. Consequently, programmable sign processors are in very common use. On the other hand, when signal processing operations are well defined, a hardwired implementation from the operations is usually optimized, resulting in the cheaper sign processor and, usually, just one that runs faster than its programmable counterpart. In purposes where the digital output in the electronic signal processor is being supplied into the user in analog form, such as in speech communications, we must provide an additional interface through the electronic domain to analog area. These types of an interface is referred to as a digital-to-analog (D/A) converter. Thus the signal is provided into the user in analog form.
Even so, there are other simple programs involving signal analysis, in which the desired information is conveyed in electronic form and no D/A converter is required. One example is, from the electronic processing of radar alerts, the information extracted from your radar sign, such as the position from the aircraft and its speed, may simply be printed on paper. There is no need for a D/A converter in this case.
Related links：
How DSP Supports Always-On Functions
electronic signal processing (DSP)
An Introduction to Electronic Sign Processing
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