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test hardware mic phase position 

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
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Baozhu Zuo 2018-12-25 09:36:27 +08:00 committed by GitHub
parent 95f4fe0688
commit 5744fd1bbb
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1 changed files with 83 additions and 0 deletions
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83
tools/phase_test.py Normal file
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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()