# SNDEXIirFilterTarget

## Definition

  `#include <twl/snd.h>`

      typedef enum _SNDEXIirFilterTarget
      {
      SNDEX_IIR_FILTER_ADC_1 = 0,
      SNDEX_IIR_FILTER_ADC_2,
      SNDEX_IIR_FILTER_ADC_3,
      SNDEX_IIR_FILTER_ADC_4,
      SNDEX_IIR_FILTER_ADC_5,

      SNDEX_IIR_FILTER_TARGET_AVAILABLE_MAX,

      SNDEX_IIR_FILTER_RESERVED_1 = SNDEX_IIR_FILTER_TARGET_AVAILABLE_MAX,
      SNDEX_IIR_FILTER_RESERVED_2,
      SNDEX_IIR_FILTER_RESERVED_3,
      SNDEX_IIR_FILTER_RESERVED_4,
      SNDEX_IIR_FILTER_RESERVED_5,
      SNDEX_IIR_FILTER_RESERVED_6,
      SNDEX_IIR_FILTER_RESERVED_7,
      SNDEX_IIR_FILTER_RESERVED_8,
      SNDEX_IIR_FILTER_RESERVED_9,
      SNDEX_IIR_FILTER_RESERVED_10,
      SNDEX_IIR_FILTER_RESERVED_11,
      SNDEX_IIR_FILTER_RESERVED_12,
      SNDEX_IIR_FILTER_RESERVED_13,
      SNDEX_IIR_FILTER_RESERVED_14,
      SNDEX_IIR_FILTER_RESERVED_15,
      SNDEX_IIR_FILTER_TARGET_MAX
      } SNDEXIirFilterTarget;

## Elements

SNDEX_IIR_FILTER_ADC_1 ... 5 | IIR filter for microphone input data (stage 1 to stage 5).
SNDEX_IIR_FILTER_RESERVED_1 ... 15 | Reserved by the system for future use. Do not specify it.

## Description

Enumerated type that indicates the target to which IIR filters will be applied.

Filters are applied in ascending numerical order, as follows.

- (Microphone) -> A/D converter → ADC1 → ADC2 → ADC3 → ADC4 → ADC5 → microphone input data

`SNDEX_IIR_FILTER_RESERVED_nn` (`nn=1～15`) is reserved by the system, and must not be specified by users.

## See Also

`SNDEX_SetIirFilter`
`SNDEX_SetIirFilterAsync`
`SNDEXIirFilterParam`

## Revision History

2011/11/01 Adjusted the definition value.
2008/07/08 Initial version.

CONFIDENTIAL