How digital filters affect analog audio signal levels
Digital audio processing provides a great amount of flexibility to system designers. Multiple filter structures can be cascaded to form equalization (EQ), low-pass, high-pass, shelf, and many other filter combinations with relatively low power consumption and little PCB space. Infinite-impulse-response (IIR) filters can be used to easily simulate filter functions performed by analog counterparts. A very important aspect to consider when digital filters are used is how the signal level is affected upon its conversion from the digital to the analog domain.
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