comparison xtract/xtract_scalar.h @ 48:8703c202a247

Added xtract_slope()

  * \param *argv: a pointer to an array containing a floating point value representing the threshold for rolloff, i.e. the percentile at which the rolloff is determined, expressed in the range 0-1.0, and a float representing the sample rate in Hz
  * \param *result: the spectral rolloff in Hz of N values from the array pointed to by *data. This is the point in the spectrum below which argv[0] of the energy is distributed.
  */
 int xtract_rolloff(const float *data, const int N, const void *argv, float *result);
 
-/* Loudness */
-/* A set of BARK_BANDS bark coefficients must be passed in, the loudness is calculated approximately according to Moore, Glasberg et al, 1997 */
-
 /** \brief Extract the 'total loudness' of an input vector using a method described by Moore, Glasberg et al (2005)
  * 
  * \param *data: a pointer to the first element in an array of floats representing a set of BARK_BANDS bark coefficients
  * \param N: the number of coefficients to be considered
  * \param *argv: a pointer to NULL

  * \param *argv: a pointer to NULL
  * \param *result: the Sharpness of N values from the array pointed to by *data
  */
 int xtract_sharpness(const float *data, const int N, const void *argv, float *result);
 
-/** \brief Extract the Slope of an input vector 
- * 
- * \param *data: a pointer to the first element in an array of floats representing the magnitude spectrum of an audio vector 
+/** \brief Extract the Slope of an input vector using a method described by Peeters(2003)
+ * 
  * \param *data: a pointer to the first element in an array of floats representing the magnitude coefficients from the magnitude spectrum of an audio vector, (e.g. the second half of the array pointed to by *result from xtract_magnitude_spectrum().
  * \param N: the number of elements to be considered
  * \param *argv: a pointer to NULL
  * \param *result: the Slope of N values from the array pointed to by *data
  */