What is decimation in frequency response?
I used Google to research some patents and I have found that term “Decimation” (in the context of frequency response) is used in the electronics field of Digital Signal Processing; specifically, Finite Input Response (FIR) digital filters. Most FIR filters use multiple registers, to store time delayed input data, add/subtract the delayed input data to/from the current input data, update the delayed input data, transfer the computation to the output register, to perform the filtering. An FIR, using the decimation method, instead, has a set of coefficients stored in Read-Only Memory (ROM) and these cooefficients are multiplied with the input data and stored in an intermediate register. After all of the multiplications are completed, the results of the multiplications are transferred to the output register of the filter.
