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The delay between playback and recording is about 200. The sound from the on-board audio jack of the Raspberry Pi has serious distortion, do not use the on-board audio jack! If you have installed PulseAudio but want to disable it, we need to disable PulseAudio's autospawn feature by adding autospawn=no to ~/.config/pulse/nf or /etc/pulse/nf, and then run pulseaudio -k ec for Raspberry Pi
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However, a line echo canceller generally cannot replace an acoustic echo canceller, because acoustic echo cancellation is a more difficult problem.
ACOUSTIC ECHO CANCELLATION WIRECAST WINDOWS 10 MAC
Audio: Windows 8, 10, MAC OSX, Linux Software: Windows 8, 10 INPUT/OUTPUT INTERFACE. Line Echo Cancellation Acoustic echo cancellation and line echo cancellation both address similar problems, and are often based on the same technology. We can also use PulseAudio's configuration file to load module-pip-sink and module-pipe-source. Full-Duplex Acoustic Echo Cancellation (AEC) Noise Cancellation (NC) Automatic Level Control (ALC) COMPATIBILITY. If microphone array processing is disabled, multi-channel input is folded down to one channel for AEC processing. Pacmd load-module module-pipe-source source_name=ec.source format=s16 rate=16000 channels=2 file=/tmp/ec.output Currently the voice capture DMO supports only single-channel acoustic echo cancellation (AEC), so the output from the speaker line must be single-channel. Pacmd load-module module-pipe-sink sink_name=ec.sink format=s16 rate=16000 channels=1 file=/tmp/ec.input