def compute_ir(n_chan, index):
import audio_io
import scipy.signal
import scipy.fftpack
# if mono, only leftchannels are used
#Extracting Channels
resp_l, resp_r, meas_l, meas_r=audio_io.extract_channels(n_chan,index)
# calculating the inverse filter
meas_fft_l = scipy.fftpack.fft(meas_l)
meas_fft_l= meas_fft_l/meas_fft_l.size
inv_meas_l = 1/meas_fft_l
inv_filter_l =scipy.fftpack.ifft(inv_meas_l)
inv_filter_l = inv_filter_l.real
meas_fft_r = scipy.fftpack.fft(meas_r)
meas_fft_r= meas_fft_r/meas_fft_r.size
inv_meas_r = 1/meas_fft_r
inv_filter_r =scipy.fftpack.ifft(inv_meas_r)
inv_filter_r = inv_filter_r.real
#convolve system response with the inverse filter
ir_l = scipy.signal.fftconvolve(resp_l,inv_filter_l)
ir_r = scipy.signal.fftconvolve(resp_r,inv_filter_r)
return (ir_l, ir_r)
def compute_resp(n_chan):
import audio_io
import scipy.signal
import scipy.fftpack
# if mono, only leftchannels are used
print "Splitting Channels"
#Extracting Channels
resp_l, resp_r, meas_l, meas_r = audio_io.extract_channels(n_chan, 0)
return (resp_l, resp_r)
def compute_resp(n_chan):
import audio_io
import scipy.signal
import scipy.fftpack
# if mono, only leftchannels are used
print "Splitting Channels"
#Extracting Channels
resp_l, resp_r, meas_l, meas_r=audio_io.extract_channels(n_chan,0)
return (resp_l, resp_r)
def compute_ir(n_chan, index):
import audio_io
# if mono, only leftchannels are used
#Extracting Channels
resp_l, resp_r, meas_l, meas_r = audio_io.extract_channels(n_chan, index)
# crosscorrelation of measurement signal and system response
# savin IR in array
ir_l = numpy.correlate(resp_l, meas_l, "same")
ir_r = numpy.correlate(resp_r, meas_r, "same")
return (ir_l, ir_r)
def compute_ir(n_chan, index):
import audio_io
# if mono, only leftchannels are used
#Extracting Channels
resp_l, resp_r, meas_l, meas_r=audio_io.extract_channels(n_chan,index)
# crosscorrelation of measurement signal and system response
# savin IR in array
ir_l=numpy.correlate(resp_l, meas_l, "same")
ir_r=numpy.correlate(resp_r, meas_r, "same")
return (ir_l, ir_r)
