Digital Signal Processor: A Tutorial Introduction to Digital Filtering

The possibility of doing filtering and other signal-processing operations by numerical means instead of by traditional analog means has been known and studied for 20 years or longer. However, until recently the hardware for the physical realization of digital filters has been bulky, power-hungry, and expensive, and for this reason the digital filter has not been suitable for use as a component in commercial systems. Thus, interest in digital filters has been limited to a relatively small number of specialists doing research in this and related fields, where size, power consumption, and cost are not primary considerations. However, VLSI has changed this condition drastically. It has reduced the size, power consumption, and cost of digital filters to the point where their use as a system component is both economically feasible and technically desirable. As a result, large numbers of system engineers and circuit designers are finding a need to learn about digital filters. Therefore, there is a place for tutorial material addressed specifically to the needs of these people. 1499