FIR_decimate

Collaboration diagram for FIR_decimate:

Functions
void	tpt_fir_decimate_f64 (f64_t *pDst, const tpt_fir_decimate_f64_t *S, const f64_t *pSrc, uint32_t blockSize)
	Processing function for floating-point FIR decimator.
tpt_status	tpt_fir_decimate_init_f64 (tpt_fir_decimate_f64_t *S, uint16_t numTaps, uint8_t M, const f64_t *pCoeffs, f64_t *pState, uint32_t blockSize)
	Initialization function for the floating-point FIR decimator.

Detailed Description

Function Documentation

tpt_fir_decimate_f64()

void tpt_fir_decimate_f64	(	f64_t *	pDst,
		const tpt_fir_decimate_f64_t *	S,
		const f64_t *	pSrc,
		uint32_t	blockSize )

Processing function for floating-point FIR decimator.

Parameters

[out]	pDst	points to the block of output data
[in]	S	points to an instance of the floating-point FIR decimator structure
[in]	pSrc	points to the block of input data
[in]	blockSize	number of input samples to process

Returns

none

tpt_fir_decimate_init_f64()

tpt_status tpt_fir_decimate_init_f64	(	tpt_fir_decimate_f64_t *	S,
		uint16_t	numTaps,
		uint8_t	M,
		const f64_t *	pCoeffs,
		f64_t *	pState,
		uint32_t	blockSize )

Initialization function for the floating-point FIR decimator.

Parameters

[in,out]	S	points to an instance of the floating-point FIR decimator structure
[in]	numTaps	number of coefficients in the filter
[in]	M	decimation factor
[in]	pCoeffs	points to the filter coefficients
[in]	pState	points to the state buffer
[in]	blockSize	number of input samples to process per call

Returns

execution status

• TPT_MATH_SUCCESS : Operation successful
• TPT_MATH_LENGTH_ERROR : blockSize is not a multiple of M

Details

pCoeffs points to the array of filter coefficients stored in time reversed order:

 {b[numTaps-1], b[numTaps-2], b[N-2], ..., b[1],
                 b[0]} 

pState points to the array of state variables. pState is of length numTaps+blockSize-1 words where blockSize is the number of input samples passed to tpt_fir_decimate_f64(). M is the decimation factor.