Convert 32-bit floating point value

Functions
void	arm_float_to_q15 (const float32_t *pSrc, q15_t *pDst, uint32_t blockSize)
	Converts the elements of the floating-point vector to Q15 vector. More...
void	arm_float_to_q31 (const float32_t *pSrc, q31_t *pDst, uint32_t blockSize)
	Converts the elements of the floating-point vector to Q31 vector. More...
void	arm_float_to_q7 (const float32_t *pSrc, q7_t *pDst, uint32_t blockSize)
	Converts the elements of the floating-point vector to Q7 vector. More...

Description

Function Documentation

void arm_float_to_q15	(	const float32_t *	pSrc,
		q15_t *	pDst,
		uint32_t	blockSize
	)

Parameters

[in]	pSrc	points to the floating-point input vector
[out]	pDst	points to the Q15 output vector
[in]	blockSize	number of samples in each vector

Returns

none

Details

The equation used for the conversion process is:

    pDst[n] = (q15_t)(pSrc[n] * 32768);   0 <= n < blockSize.

Scaling and Overflow Behavior

The function uses saturating arithmetic. Results outside of the allowable Q15 range [0x8000 0x7FFF] are saturated.

Note

In order to apply rounding, the library should be rebuilt with the ROUNDING macro defined in the preprocessor section of project options.

void arm_float_to_q31	(	const float32_t *	pSrc,
		q31_t *	pDst,
		uint32_t	blockSize
	)

Parameters

[in]	pSrc	points to the floating-point input vector
[out]	pDst	points to the Q31 output vector
[in]	blockSize	number of samples in each vector

Returns

none

Details

The equation used for the conversion process is:

    pDst[n] = (q31_t)(pSrc[n] * 2147483648);   0 <= n < blockSize.

Scaling and Overflow Behavior

The function uses saturating arithmetic. Results outside of the allowable Q31 range[0x80000000 0x7FFFFFFF] are saturated.

Note

In order to apply rounding, the library should be rebuilt with the ROUNDING macro defined in the preprocessor section of project options.

void arm_float_to_q7	(	const float32_t *	pSrc,
		q7_t *	pDst,
		uint32_t	blockSize
	)

Parameters

[in]	*pSrc	points to the floating-point input vector
[out]	*pDst	points to the Q7 output vector
[in]	blockSize	length of the input vector

Returns

none.

Description:

The equation used for the conversion process is:

        pDst[n] = (q7_t)(pSrc[n] * 128);   0 <= n < blockSize.
 

Scaling and Overflow Behavior:

The function uses saturating arithmetic. Results outside of the allowable Q7 range [0x80 0x7F] will be saturated.

Note

In order to apply rounding, the library should be rebuilt with the ROUNDING macro defined in the preprocessor section of project options.