DSP_fir_r4
[Filtering and convolution]

Collaboration diagram for DSP_fir_r4:

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Detailed Description

void	DSP_fir_r4 (const short *restrict x, const short *restrict h, short *restrict r, int nh, int nr)

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Function Documentation

void DSP_fir_r4	(	const short *restrict	x,
		const short *restrict	h,
		short *restrict	r,
		int	nh,
		int	nr
	)

This function implements an IIR filter, with a number of biquad stages given by nCoefs / 4. It accepts a single sample of input and returns a single sample of output. Coefficients are expected to be in the range [-2.0, 2.0) with Q14 precision.

Parameters:

	x	= Input array [nr+nh-1 elements]
	h	= Coeff array [nh elements]
	r	= Output array [nr elements]
	nh	= Number of coefficients
	nr	= Number of output samples

Algorithm:

DSP_fir_r4_cn.c is the natural C equivalent of the optimized intrinsic C code without restrictions. Note that the intrinsic C code is optimized and restrictions may apply.

Assumptions:

Arrays x, h, and r do not overlap.
x, h and r are double word aligned.
nr >= 4; nr % 4 == 0.
nh >= 4; nh % 4 == 0.

Implementation Notes:

Endian Support: The code supports both big and little endian modes. Interruptibility: The code is interruptible

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Copyright 2014, Texas Instruments Incorporated