aubio  0.4.9
Functions
a_weighting.h File Reference

Go to the source code of this file.

Functions

aubio_filter_tnew_aubio_filter_a_weighting (uint_t samplerate)
 create new A-design filter More...
 
uint_t aubio_filter_set_a_weighting (aubio_filter_t *f, uint_t samplerate)
 set feedback and feedforward coefficients of a A-weighting filter More...
 

Detailed Description

A-weighting filter coefficients

This file creates an A-weighting digital filter, which reduces low and high frequencies and enhance the middle ones to reflect the ability of the human hearing.

The implementation is based on the following standard:

See also:

The coefficients in this file have been computed using Christophe Couvreur's scripts in octave 3.0 (debian package 1:3.0.5-6+b2 with octave-signal 1.0.9-1+b1 on i386), with

 [b, a] = adsign(1/Fs) 

for various sampling frequencies (8000, 11025, 16000, 22050, 24000, 32000, 44100, 48000, 88200, 96000, and 192000 Hz).

The sampling frequency should normally be higher than 20kHz, but most common file sampling rates have been included for completeness.

Definition in file a_weighting.h.

Function Documentation

◆ aubio_filter_set_a_weighting()

uint_t aubio_filter_set_a_weighting ( aubio_filter_t f,
uint_t  samplerate 
)

set feedback and feedforward coefficients of a A-weighting filter

Parameters
ffilter object to get coefficients from
sampleratesampling frequency of the signal to filter. Should be one of 8000, 11025, 16000, 22050, 24000, 32000, 44100, 48000, 88200, 96000, and 192000 Hz
Examples
temporal/test-a_weighting.c, and temporal/test-filter.c.

◆ new_aubio_filter_a_weighting()

aubio_filter_t* new_aubio_filter_a_weighting ( uint_t  samplerate)

create new A-design filter

Parameters
sampleratesampling frequency of the signal to filter. Should be one of 8000, 11025, 16000, 22050, 24000, 32000, 44100, 48000, 88200, 96000, and 192000 Hz
Returns
a new filter object
Examples
temporal/test-a_weighting.c, and temporal/test-filter.c.