Crash_Override/FreeDATA
1
0
Fork 0
mirror of https://github.com/DJ2LS/FreeDATA synced 2024-05-14 08:04:33 +00:00
Code Issues Packages Projects Releases Wiki Activity

added preamble transmission

Browse source
This commit is contained in:
DJ2LS 2021-01-16 14:28:47 +01:00 committed by GitHub
parent f15e7dc3b5
commit a316126725
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
1 changed files with 12 additions and 17 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

29
modem.py
View file

@ -145,26 +145,21 @@ class RF():
data = (ctypes.c_ubyte * bytes_per_frame).from_buffer_copy(buffer)
self.c_lib.freedv_rawdatatx(freedv,mod_out,data) # modulate DATA and safe it into mod_out pointer
#print(bytes(mod_out).strip(b'\x00'))
#p = pyaudio.PyAudio()
#stream_tx = p.open(format=pyaudio.paInt16,
# channels=static.AUDIO_CHANNELS,
# rate=static.AUDIO_SAMPLE_RATE,
# frames_per_buffer=n_nom_modem_samples,
# output=True,
# output_device_index=1, #static.AUDIO_OUTPUT_DEVICE
# )
# -------------- preamble area
modulation = bytes(mod_out)
if mode == 7:
mod_with_preamble = modulation[:len(modulation)] + modulation # double transmission in one audio burst
if mode >= 10:
mod_with_preamble = modulation[:0] + modulation # no preamble
audio = audioop.ratecv(mod_out,2,1,static.MODEM_SAMPLE_RATE, static.AUDIO_SAMPLE_RATE_TX, static.TX_SAMPLE_STATE)
# -------------- audio sample rate conversion
audio = audioop.ratecv(mod_with_preamble,2,1,static.MODEM_SAMPLE_RATE, static.AUDIO_SAMPLE_RATE_TX, static.TX_SAMPLE_STATE)
# -------------- transmit audio
self.stream_tx.write(audio[0])
#print("KILL")
#stream_tx.stop_stream()
#stream_tx.close()
#p.terminate()
return mod_out
#--------------------------------------------------------------------------------------------------------