AecQualityMetrics_Struct Structure

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Contains quality metrics for acoustic echo cancellation (AEC). This structure is used with the MFPKEY_WMAAECMA_RETRIEVE_TS_STATS property.

Syntax

typedef struct {
  LONGLONG i64Timestamp;
  BYTE     ConvergenceFlag;
  BYTE     MicClippedFlag;
  BYTE     MicSilenceFlag;
  BYTE     PstvFeadbackFlag;
  BYTE     SpkClippedFlag;
  BYTE     SpkMuteFlag;
  BYTE     GlitchFlag;
  BYTE     DoubleTalkFlag;
  ULONG    uGlitchCount;
  ULONG    uMicClipCount;
  float    fDuration;
  float    fTSVariance;
  float    fTSDriftRate;
  float    fVoiceLevel;
  float    fNoiseLevel;
  float    fERLE;
  float    fAvgERLE;
  DWORD    dwReserved;
} AecQualityMetrics_Struct;

Members

  • i64Timestamp
    Time stamp that indicates when the quality metrics were collected.

  • ConvergenceFlag
    AEC convergence flag.

  • MicClippedFlag
    If TRUE, the input signal from the audio capture device was clipped.

  • MicSilenceFlag
    If TRUE, the input signal from the audio capture device was silent or too quiet.

  • PstvFeadbackFlag
    If TRUE, positive feedback is causing a chirping sound.

  • SpkClippedFlag
    If TRUE, the input signal from the audio rendering device was clipped.

  • SpkMuteFlag
    If TRUE, the input signal from the audio rendering device was silent or too quiet.

  • GlitchFlag
    A glitch occurred in the input data.

  • DoubleTalkFlag
    Double talk flag.

  • uGlitchCount
    Number of glitches.

  • uMicClipCount
    Number of times the audio capture signal was clipped.

  • fDuration
    Running duration of the AEC process.

  • fTSVariance
    Long-term average variance in the time stamps.

  • fTSDriftRate
    Long-term average drift rate in the time stamps.

  • fVoiceLevel
    Near-end voice level after AEC processing.

  • fNoiseLevel
    Noise level of the audio capture signal.

  • fERLE
    Echo return loss enhancement (ERLE).

  • fAvgERLE
    Average ERLE over the entire duration of AEC processing.

  • dwReserved
    Reserved

Requirements

Minimum supported client

 Windows XP

Minimum supported server

 Windows Server 2003

Header

 Wmcodecdsp.h

See Also

Structures

Using the Voice Capture DSP

Voice Capture DSP

 

 

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Build date: 4/7/2010