#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;
The coefSelect parameter specifies the active filter coefficients when srcSelect is set to AX_PB_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 inaxvpb.sync, when setting a new coefSelect type.
axvpb.sync, axvpb.pb.srcSelect, AXSetVoiceSrcType
2006/03/01 Initial version.
CONFIDENTIAL