5744fd1bbb
baozhu@bz:/tmp$ python wave_test.py record.wav 2 ['448.8125', '446.65625', '-0.1875', '330.8125', '448.375', '450.59375', '451.0'] ['448.78125', '448.5625', '-0.1875', '-0.125', '448.3125', '-0.125', '-450.78125'] ['0.0', '0.0', '0.0', '-0.09375', '-0.09375', '-0.09375', '0.21875'] ['0.0', '0.0', '0.0', '-0.09375', '-0.09375', '-0.09375', '0.21875'] ['0.0', '0.0', '0.0', '-0.09375', '-0.09375', '-0.09375', '0.21875'] ['0.0', '0.0', '0.0', '-0.09375', '-0.09375', '-0.09375', '0.21875'] ['0.0', '0.0', '0.0', '-0.09375', '-0.09375', '-0.09375', '0.21875'] ['0.0', '0.0', '0.0', '-0.09375', '-0.09375', '-0.09375', '0.21875'] ['0.0', '0.0', '0.0', '-0.09375', '-0.09375', '-0.09375', '0.21875'] ['0.0', '0.0', '0.0', '-0.09375', '-0.09375', '-0.09375', '0.21875'] ['0.0', '0.0', '0.0', '-0.09375', '-0.09375', '-0.09375', '0.21875'] ['0.0', '0.0', '0.0', '-0.09375', '-0.09375', '-0.09375', '0.21875'] ['0.0', '0.0', '0.0', '-0.09375', '-0.09375', '-0.09375', '0.21875'] ['0.0', '0.0', '0.0', '-0.09375', '-0.09375', '-0.09375', '0.21875'] ['0.0', '0.0', '0.0', '-0.09375', '-0.09375', '-0.09375', '0.21875'] ['0.0', '0.0', '0.0', '-0.09375', '-0.09375', '-0.0625', '0.21875'] ['0.0', '0.0', '0.0', '-0.09375', '-0.09375', '-0.09375', '0.21875'] ['0.0', '0.0', '0.0', '-0.09375', '-0.09375', '-0.09375', '0.21875'] ['0.0', '0.0', '0.0', '-0.09375', '-0.09375', '-0.09375', '0.25'] ['0.0', '0.0', '0.0', '-0.09375', '-0.09375', '-0.09375', '0.25'] ['0.0', '0.0', '0.0', '-0.09375', '-0.09375', '-0.09375', '0.25'] ['0.0', '0.0', '0.0', '-0.09375', '-0.09375', '-0.09375', '0.25'] ['0.0', '0.0', '0.0', '-0.09375', '-0.09375', '-0.09375', '0.21875'] ['0.0', '0.0', '0.0', '-0.09375', '-0.09375', '-0.09375', '0.21875'] ['0.0', '0.0', '0.0', '-0.09375', '-0.09375', '-0.09375', '0.21875'] ['0.0', '0.0', '0.0', '-0.09375', '-0.09375', '-0.09375', '0.21875'] ['0.0', '0.0', '0.0', '-0.09375', '-0.09375', '-0.09375', '0.21875'] ['0.0', '0.0', '0.0', '-0.09375', '-0.09375', '-0.09375', '-0.96875'] ['0.03125', '0.0', '-0.0625', '-0.09375', '-0.0625', '-0.09375', '-23.0625'] ['0.0', '0.0', '-0.0625', '-0.09375', '-0.0625', '-0.09375', '-23.125'] done 48000
83 lines
1.9 KiB
Python
83 lines
1.9 KiB
Python
import sys
|
|
import wave
|
|
import numpy as np
|
|
|
|
|
|
if len(sys.argv) != 2:
|
|
print('Usage: {} multi.wav'.format(sys.argv[0]))
|
|
sys.exit(1)
|
|
|
|
|
|
multi = wave.open(sys.argv[1], 'rb')
|
|
rate = multi.getframerate()
|
|
channels = multi.getnchannels()
|
|
|
|
if channels <= 1:
|
|
sys.exit(1)
|
|
|
|
N = rate
|
|
|
|
window = np.hanning(N)
|
|
|
|
interp = 4*8
|
|
max_offset = int(rate * 0.1 / 340 * interp)
|
|
|
|
def gcc_phat(sig, refsig, fs=1, max_tau=None, interp=16):
|
|
'''
|
|
This function computes the offset between the signal sig and the reference signal refsig
|
|
using the Generalized Cross Correlation - Phase Transform (GCC-PHAT)method.
|
|
'''
|
|
|
|
# make sure the length for the FFT is larger or equal than len(sig) + len(refsig)
|
|
n = sig.shape[0] + refsig.shape[0]
|
|
|
|
# Generalized Cross Correlation Phase Transform
|
|
SIG = np.fft.rfft(sig, n=n)
|
|
REFSIG = np.fft.rfft(refsig, n=n)
|
|
R = SIG * np.conj(REFSIG)
|
|
#R /= np.abs(R)
|
|
|
|
cc = np.fft.irfft(R, n=(interp * n))
|
|
|
|
max_shift = int(interp * n / 2)
|
|
if max_tau:
|
|
max_shift = np.minimum(int(interp * fs * max_tau), max_shift)
|
|
|
|
cc = np.concatenate((cc[-max_shift:], cc[:max_shift+1]))
|
|
|
|
# find max cross correlation index
|
|
shift = np.argmax(np.abs(cc)) - max_shift
|
|
|
|
tau = shift / float(interp * fs)
|
|
|
|
return tau, cc
|
|
|
|
|
|
print(multi.getsampwidth())
|
|
|
|
while True:
|
|
data = multi.readframes(N)
|
|
|
|
if len(data) != multi.getsampwidth() * N * channels:
|
|
print("done")
|
|
break
|
|
|
|
if multi.getsampwidth() == 2:
|
|
data = np.fromstring(data, dtype='int16')
|
|
else:
|
|
data = np.fromstring(data, dtype='int32')
|
|
ref_buf = data[0::channels]
|
|
|
|
offsets = []
|
|
for ch in range(1, channels):
|
|
sig_buf = data[ch::channels]
|
|
tau, _ = gcc_phat(sig_buf * window, ref_buf * window, fs=1, max_tau=max_offset, interp=interp)
|
|
# tau, _ = gcc_phat(sig_buf, ref_buf, fs=rate, max_tau=1)
|
|
|
|
offsets.append(tau)
|
|
|
|
print(offsets)
|
|
|
|
print(multi.getframerate())
|
|
|
|
multi.close()
|