digital signal processing
Signal processing involves the analysis, interpretation, and manipulation of signals like sound, images, and sensor data. It is used to retrieve the original signal from one that has been contaminated with noise during transmission. There are two main categories: analog signal processing, which uses electronic circuits like filters on un-digitized signals; and digital signal processing, which uses computers or specialized chips to process digitized signals. The digital signal processing block diagram consists of an anti-aliasing filter, analog-to-digital converter, digital filter, digital-to-analog converter, and reconstruction filter. Digital signal processing has advantages over analog like greater accuracy, flexibility, ease of storage and operation, and ability to multiplex signals.
digital signal processing
- 1. Topic-Dsp block diagram Name- Marmik Kothari (140410111027) Subject- Digital Signal Processing Branch/Year : EC LY
- 2. What is Signal processing? Signal processing is the analysis, interpretation, and manipulation of signals like sound, images time-varying measurement values and sensor data etc… For example biological data such as electrocardiograms, control system signals, telecommunication transmission signals such as radio signals, and many others.
- 3. Need of Signal Processing When a signal is transmitted from one point to another there is every possibility of contamination /deformation of the signal by external noise. So to retrieve the original signal at the receiver suitable filters are to be used. i.e the signal is processed to obtain the pure signal.
- 4. Categories of signal processing Analog signal processing — for signals that have not been digitized, as in classical radio, telephone, radar, and television systems. This involves linear electronic circuits such as passive filters, active filters, additive mixers, integrators and delay lines.
- 5. It also involves non-linear circuits such as compandors, multiplicators (frequency mixers and voltage-controlled amplifiers), voltage-controlled filters, voltage-controlled oscillators and phase-locked loops. Digital signal processing — for signals that have been digitized, processing is done by general-purpose computers or by digital circuits such as ASICs, field-programmable gate arrays or specialized digital signal processors (DSP chips).
- 6. So the processing of the signal helps to estimate characteristic parameters of the signal and also to transform the signal in to the desired form.
- 7. Analog signal processing The analog signal processing is basically, filtering of the signal . It can be denoted by the following diagram.
- 8. Digital signal processing-Block diagram The digital signal processor consists of anti-aliasing filter, analog to digital converter (ADC), a digital filter represented by the transfer function H(z), a digital to analog converter and a reconstruction filter.
- 9. Advantages of Digital over analog signal processing Accuracy: The analog circuits are prone to temperature and external effects, but the digital filters have no such problems. Flexibility: Reconfiguration of analog filters is very complex whereas the digital filters can be reconfigured easily by changing the program coefficients.
- 10. Digital signals can be easily stored on any magnetic media or optical media are using semiconductor chips. Easy operation: Even complex mathematical operations can be performed easily using computers, which is not the case with analog processing.
- 11. Multiplexing: Digital signal processing provides the way for Integrated service digital network (ISDN) where digitized signals can be multiplexed with other digital data and transmitted through the same channel.