Digital filter algorithms are usually represented in form of block diagrams and flowgraphs. Both representations are based on the following three basic elements:
The last-mentioned function corresponds to the operation of a D flip-flop in digital systems. Triggered by the rising or falling edge of the applied clock signal, the information at the input is stored and passed to the output. This leads to the situation that we find a sample value at the output of the delay element that was applied to the input during the previous clock period. Shift-register structures, in which sample sequences can be stored and shifted, are realised by serial arrangement of the named delay elements.
Addition of two signal sequences
Multiplication of a sequence by a constant
Delay of a sequence by one sample period T
KeywordsAttenuation Assure Convolution Sine Dock
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