Block Filtering Functions

Intel IPP functions described in this section implement the finite impulse response (FIR) block filter. You can use this group of functions to design transform domain adaptive filters. These filters preprocess the signal by decomposing the input vector into orthogonal components, which are subsequently used as inputs to a parallel bank of adaptive subfilters. You may use this approach for implementing frequency domain linear predictors in audio codecs, for example, CELP and AAC.

The filtering function receives a number of vectors (signals). Every call of a filtering function produces one filtered sample for each input signal. The library functions do not perform any particular adaptation method but you can specify the filter taps at each call of a filtering function.

To use the FIR block filter functions, follow these general steps:

Call ippsFIRBlockInitAlloc to initialize the state structure of a block filter.
Call ippsFIRBlockOne to filter a vector of samples through a block filter.
Call ippsFIRBlockFree to free dynamic memory associated with the FIR block filter.