DSFXParamEq

The DSFXParamEq structure contains parameters for a parametric equalizer effect.

Syntax

typedef struct _DSFXParamEq {
  FLOAT  fCenter;
  FLOAT  fBandwidth;
  FLOAT  fGain;
} DSFXParamEq, *LPDSFXParamEq;

Members

fCenter

Center frequency, in hertz, in the range from DSFXPARAMEQ_CENTER_MIN to DSFXPARAMEQ_CENTER_MAX. This value cannot exceed one-third of the frequency of the buffer. The default value is 8000.

fBandwidth

Bandwidth, in semitones, in the range from DSFXPARAMEQ_BANDWIDTH_MIN to DSFXPARAMEQ_BANDWIDTH_MAX. The default value is 12.

fGain

Gain, in the range from DSFXPARAMEQ_GAIN_MIN to DSFXPARAMEQ_GAIN_MAX. The default value is 0.

Remarks

The value in fCenter cannot exceed one-third of the frequency of the buffer. If an attempt is made to set a value greater than this, but within the range of accepted values, the parameter is set to the nearest supported value and S_FALSE is returned by IDirectSoundFXParamEq8::SetAllParameters.

Requirements

  Header: Declared in Dsound.h.

See Also

• IDirectSoundFXParamEq8 Interface
• Parametric Equalizer