Posted by: Margaret RouseWhatIs.com
Contributor(s): David Brancato, Mark Denni, and Vincent MartinezDigital signal processing (DSP) refers to various techniques for improving the precision and reliability of digital communications. The theory behind DSP is quite complex. Fundamentally, DSP performs by clarifying, or standardizing, the levels or states of a digital signal. ADSP circuit is able to differentiate between human-made indicators,which are orderly, and noise, which is inherently chaotic.
All communications circuits contain some noise.This is true no matter if the signals are analog or digital,and regardless from the type of data conveyed. Noise is the eternal bane of communications engineers, who are always striving to find new ways to make improvements to the signal-to-noise ratioin communications units. Traditional procedures of optimizing S/N ratio include increasing the transmitted sign power and increasing the receiver sensitivity. (In wireless units,specialized antenna units can also help.) Electronic signal processing dramatically improves the sensitivity of a receiving unit. The effect is most obvious when noise competes by using a desired signal. A good DSP circuit can sometimes seem like an electronic miracle worker. But there are limits to what it can do. If the noise is so strong that all traces from the sign are obliterated, a DSP circuit cannot find any get while in the chaos,and no signal will probably be received.
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If an incoming sign is analog, as an example a standard television broadcast station, the signal is first converted to electronic form by an analog-to-digital converter(ADC). The resulting digital signal has two or far more levels. Ideally, these levels are always predictable, exact voltages or currents. Having said that, because the incoming signal incorporates noise, the levels are not always at the standard values. The DSP circuit adjusts the levels so they are at the correct values. This practically eliminates the noise. The digital sign is then converted back to analog from via a digital-to-analog converter (DAC).
If a received sign is electronic, by way of example computer info, then the ADC and DAC are not necessary. The DSP acts directly to the incoming sign, eliminating irregularities caused by noise, and thereby minimizing the amount of errors per unit time.