fir

C++ interface for Finite Impulse Response. More...

array	fir (int nb, const float *h_b, const array &x)
array	fir (const array &b, const array &x)
	Finite impulse response filtering. More...

Detailed Description

C++ interface for Finite Impulse Response.

Applies a Finite impulse response filter to an array. This filter is used in digital signal processing and is called finite (as opposed to iir) because the impulse response settles to zero in a fixed number of steps.

The FIR is defined as:

\[y_{n-1} = b_0*x_{n-1} + b_1*x_{n-2} + \ldots + b_{nb-1}*x_{n-nb-1}\]

array x = randu(5);
// x = 0.3194
//     0.8109
//     0.1541
//     0.4452
//     0.2080

float h_b[] = {0.1,0.2,0.3,0.4,0.5};
array f = fir(5, h_b, x);
// f = 0.0319
//     0.1450
//     0.2734
//     0.4464
//     0.6401

Function Documentation

array af::fir	(	int	nb,
		const float *	h_b,
		const array &	x
	)

Parameters

[in]	nb	length of h_b
[in]	h_b	host-array of filter coefficients
[in]	x

Returns

filtered signal (y) same size as x

array af::fir	(	const array &	b,
		const array &	x
	)

Finite impulse response filtering.

Parameters

[in]	b	filter
[in]	x	signal

Returns

filtered signal (y) same size as x