Closed medouederni closed 8 years ago
Generate PCM audio file:
$ amodem send -vv --audio-library=- --input=data.tx --output=audio.pcm
2016-03-10 19:20:31,384 DEBUG Audio OFDM MODEM v1.13: 1.0 kb/s (2-QAM x 1 carriers) Fs=8.0 kHz __main__.py:222
2016-03-10 19:20:31,405 INFO Sending 0.800 seconds of training audio main.py:21
2016-03-10 19:20:31,405 INFO Starting modulation main.py:26
2016-03-10 19:20:31,425 DEBUG Sent 0.125 kB send.py:49
2016-03-10 19:20:31,444 DEBUG Sent 0.250 kB send.py:49
2016-03-10 19:20:31,463 DEBUG Sent 0.375 kB send.py:49
2016-03-10 19:20:31,482 DEBUG Sent 0.500 kB send.py:49
2016-03-10 19:20:31,501 DEBUG Sent 0.625 kB send.py:49
2016-03-10 19:20:31,520 DEBUG Sent 0.750 kB send.py:49
2016-03-10 19:20:31,539 DEBUG Sent 0.875 kB send.py:49
2016-03-10 19:20:31,559 DEBUG Sent 1.000 kB send.py:49
2016-03-10 19:20:31,563 INFO Sent 1.000 kB @ 8.201 seconds main.py:31
2016-03-10 19:20:31,563 DEBUG Finished I/O __main__.py:249
Set WAV header parameters:
$ sox -traw -c1 -esigned-integer -b16 -r8000 audio.pcm audio.wav
$ ls -l audio.*
-rw-r--r-- 1 roman roman 148016 Mar 10 19:20 audio.pcm
-rw-r--r-- 1 roman roman 148060 Mar 10 19:20 audio.wav
Note that the sampling rate must match (Fs = 8.0 kHz ==> "-r8000" sox flag
).
Also, note that the sampling rate changes for higher bitrates.
@romanz can I use this module to generate a wav file from a string ? I want to generate the wav file in a virtual machine in the cloud (without a sound card/system).