axvpb.pb.coefSelect

C Specification

#define AX_PB_COEFSEL_8KHZ      0x0000  // roll off at 8KHz
#define AX_PB_COEFSEL_12KHZ     0x0001  // roll off at 12.8KHz N64 type response
#define AX_PB_COEFSEL_16KHZ     0x0002  // roll off at 16KHz

u16 coefSelect;

Description

The coefSelect parameter specifies the active filter coefficients when srcSelect is set to AX_PB_SRCSEL_POLYPHASE. This parameter has no effect when other sample rate converters are used. Three sets of filter coefficients are provided, each with the frequency response indicated above.
Note: The slope for each filter is approximately -3dB/octave.

The user must assert the AX_SYNC_USER_SRCSELECT synchronization flag in axvpb.sync, when setting a new coefSelect type.

See Also

axvpb.sync
axvpb.pb.srcSelect
AXSetVoiceSrcType

Revision History

03/01/2006 Initial version.