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ACX_MIC_ARRAY_GEOMETRY structure (acxpin.h)

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The ACX_MIC_ARRAY_GEOMETRY structure specifies the type and the geometry of the microphone array.

Syntax

typedef struct _ACX_MIC_ARRAY_GEOMETRY {
  USHORT Version;
  USHORT MicArrayType;
  SHORT  VerticalAngleBegin;
  SHORT  VerticalAngleEnd;
  SHORT  HorizontalAngleBegin;
  SHORT  HorizontalAngleEnd;
  ULONG  FrequencyBandLo;
  ULONG  FrequencyBandHi;
} ACX_MIC_ARRAY_GEOMETRY, *PACX_MIC_ARRAY_GEOMETRY;

Members

Version

Specifies the version number of the mic array specification. It is currently set to 0x0100, which represents a version number of 1.0.

MicArrayType

Specifies the type of microphone array in use. This member can be any one of the ACX_MIC_ARRAY_TYPE enumeration values.

VerticalAngleBegin

Specifies the vertical angle of the start of the working volume of the microphone array.

VerticalAngleEnd

Specifies the vertical angle of the end of the working volume of the microphone array.

HorizontalAngleBegin

Specifies the work volume horizontal angle begin.

HorizontalAngleEnd

Specifies the work volume horizontal angle end.

FrequencyBandLo

Specifies the low end of the frequency range for the microphone array.

FrequencyBandHi

Specifies the high end of the frequency range for the microphone array.

Remarks

All angle values are expressed in units of 1/10000th of a radian. For example, 3.1416 radians is expressed as 31416 units. Acceptable values range from -31416 to 31416 units.

All coordinate values are expressed in millimeters. Acceptable values range from -32768 to 32767, inclusive.

Frequency values are expressed in Hertz (Hz).

For more information about how to process a microphone array in Windows, see the Microphone array support in Windows white paper.

ACX requirements

Minimum ACX version: 1.0

For more information about ACX versions, see ACX version overview.

Requirements

Requirement Value
Header acxpin.h

See also