SNDEXIirFilterParam

Definition

#include <twl/snd.h>
typedef struct _SNDEXIirFilterParam
{
    u16 n0;
    u16 n1;
    u16 n2;
    u16 d1;
    u16 d2;
} SNDEXIirFilterParam;

Elements

n0, n1, n2, d1, d2 Coefficients that compose an IIR filter (0 – 65,535).

Description

A structure that is a collection of parameters used to set IIR filters.

You can use the parameters (Hex-type values) calculated with the IIR_FilterBuilder unchanged. (However, when using Values-type values, you must type-cast them to u16.)

The initial values for these parameters, for each filter that can be specified by the SNDEXIirFilterTarget structure, are as follows.

n0 = 0x7FFF(32767), n1 = n2 = d1 = d2 = 0

Even if you have configured parameters for the various filters, resetting them to the values above will restore the initial filter state.

See Also

SNDEX_SetIirFilter, SNDEX_SetIirFilterAsync

Revision History

2008/09/10 Added a link to IIR_FilterBuilder.
2008/07/08 Initial version.

CONFIDENTIAL