Digital signal processing is used instead of complicated analogue circuits.
It is used in mobile phones and PA amplifiers to prevent feed back (howl round).
A microphone placed near a speaker, will cause the microphone to hear itself and cause an annoying howl. By applying some of the mic signal in antiphase to the local speaker, this can be stopped. This allows simultaneous conversation using hands free, which would be impossible without digital signal processing.
It can also be used to clean up old recordings to remove noise.
All sorts of effects can be applied to an audio signal, such as reverberation, echo and tone.
Once the signal is in digital form, all the processing can be done by a program using mathematical processes and applied digitally to the original signal. Changes can be made by simply altering a few lines of code.
before digital processes, sound had to be altered by complicated, expensive, circuits that could not be changed easily.
Digital Signal Processing
The basic elements in digital signal processing are an analog to digital converter, digital signal processor, and digital to analog converter. This process can take an analog input signal, convert it to digital for processing and offer an analog output.
Digital signal processing is the best compared to analog signal. It is because the digital signal is moreefficienterror freeimmune to noisethan an analog signal
Emmanuel C. Ifeachor has written: 'Digital signal processing' -- subject(s): Adaptive signal processing, Digital filters (Mathematics), Digital techniques, Signal processing
we can do analog signal processing also but it is very expensive as comparing with digital signal processing that's why we generally choose the digital signal processing.DSP allows programmable operations.But we cannot do in ASP.
Steve. White has written: 'Digital signal processing' -- subject(s): Digital techniques, Signal processing
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Robert O. Harger has written: 'An introduction to digital signal processing with Mathcad' -- subject(s): Computer programs, Digital techniques, MathCAD, Signal processing 'An Introduction to Digital Signal Processing with MathCad(r)'
Signal processing and linear systems by B.P LATHI
Digital Image Processing is a type of Digital manipulation pertaining to pictures and video. "Photoshopping" a digital picture is an example of Digital Image Processing. Another example is what takes place in a digital camera when the image is captured on the image sensor and converted into a JPEG file to be saved on a memory card. Digital Signal Processing is a generic term for any manipulation of a Digitally encoded signal, such as Audio, Video, or Radio Signals. This also includes Digital Image Processing where there is a signal being sent from one part of a system to another, such as in a digital camera. There are Microprocessors that are specifically built to process digital signals known as "Digital Signal Processors" (or DSP's).
Digital is always preferred over analog for the following reasonsAccuracyImmune to noiseEasy error detection and correctionThe same is true for digital signal processing too.
DSP -Digital signal processing the word it self says it is process of analyzing the digital signal . The system which does this work of analysis is the digital signal processing system. In this system the raw analog signal(ex:human voice) which is time domain signal is fed to the pre aliasing filter which removes noise part of the signal and this fed to the sampling and quantization in which the real time analog signal is discretized and digitized . After this process this digitized signal is fed to the DSP processor to do the specific operation on the signal (ex: convolution , modulation etc.,) .This processed signal is fed to the D/A which converts the digital signal to the analog signal real time signal. after all explaining the process of signal processing. the stages between the sampling and D/A is the digital processing system.