Поделиться через


AecQualityMetrics_Struct Structure

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

 

 

Send comments about this topic to Microsoft

Build date: 4/7/2010