I am trying to read a FM signal recorded as WAV file using GNU radio Companion, using python. I am attaching the .grc file used.
I can clearly hear the recorded signal but reading the data gives a null ([] ) value.
The python code
import soundfile as sf
data, fs = sf.read('/home/fm_record_RSM_10_01_2019_dat.wav')
for i in data:
print(i)
this gives data as array([], dtype=float64) and fs as 96000.
When the following code is used,
import wave
input_wave_file= wave.open('/home/dstlab2/fm_record_RSM_10_01_2019_dat.wav', 'r')
nc,sw,fr,nf,ct,cn = input_wave_file.getparams()
another error is raised
Error Traceback (most recent call last)
<ipython-input-3-5009fe3506e7> in <module>()
1 import wave
2
----> 3 input_wave_file= wave.open('/home/fm_record_RSM_10_01_2019_dat.wav', 'r')
4 nc,sw,fr,nf,ct,cn = input_wave_file.getparams()
5 frame_data = input_wave_file.readframes(5)
~/anaconda3/lib/python3.7/wave.py in open(f, mode)
508 mode = 'rb'
509 if mode in ('r', 'rb'):
--> 510 return Wave_read(f)
511 elif mode in ('w', 'wb'):
512 return Wave_write(f)
~/anaconda3/lib/python3.7/wave.py in __init__(self, f)
162 # else, assume it is an open file object already
163 try:
--> 164 self.initfp(f)
165 except:
166 if self._i_opened_the_file:
~/anaconda3/lib/python3.7/wave.py in initfp(self, file)
131 raise Error('file does not start with RIFF id')
132 if self._file.read(4) != b'WAVE':
--> 133 raise Error('not a WAVE file')
134 self._fmt_chunk_read = 0
135 self._data_chunk = None
Error: not a WAVE file
Could someone help me to find what the problem could be? Is it because of any mistake in the setting of record wav block in .grc file or any mistake in python file? Kindly help