Introduction to Analog Filters
Signal processing techniques involve methods to extract information from various types of signal sources but also methods to protect, store, and retrieve the information at a later date. In, for example, a telecommunication system we are interested in transmitting information from one place to another, whereas in other applications, e.g., MP3 players, we are interested in efficient storing and retrieving of information. Note that storing information for later retrieval can be viewed as transmitting the information over a transmission channel with an arbitrary long time delay. In many cases, for example in the MP3 format, signal processing techniques have been used to remove nonaudible (redundant) information in order to reduce the amount of information that needs to be stored.