11/2/2022 0 Comments Usb pnp audio device mic![]() sox "/home/local/Desktop/Dual Microphone Noise Cancellation/USB_Mic_1.wav" -n noiseprof "/home/local/Desktop/Dual Microphone Noise Cancellation/USB_Mic_1.prof" For now, we’ll have SoX use one of the microphones as a noise profile source and the other to apply that noise filter too. I’ll cover in more detail about the noise profile that SoX creates later. The noise cancellation doesn’t use phase reversal. Much better, the audio track time is exact. gnome-terminal -e "ffmpeg -f alsa -ac 1 -ar 44100 -i hw:1,0 -t 10 '/home/local/Desktop/Dual Microphone Noise Cancellation/USB_Mic_1.wav'" & gnome-terminal -e "ffmpeg -f alsa -ac 1 -ar 44100 -i hw:2,0 -t 10 '/home/local/Desktop/Dual Microphone Noise Cancellation/USB_Mic_2.wav'" Don’t despair, SoX will be used to apply the noise filtering later. I wanted to keep this simple, so FFMPeg was used to record. Now, I could have done the recording with SoX, but that would have required multiple lines of code. The next challenge is to get both of these commands to run at the same time. ffmpeg -f alsa -ac 1 -ar 44100 -i hw:1,0 -t 10 '/home/local/Desktop/Dual Microphone Noise Cancellation/USB_Mic_1.wav'įfmpeg -f alsa -ac 1 -ar 44100 -i hw:2,0 -t 10 '/home/local/Desktop/Dual Microphone Noise Cancellation/USB_Mic_2.wav' To capture audio from these devices, I use separate FFMpeg commands. Here are the results of the arecord -l command **** List of CAPTURE Hardware Devices ****Ĭard 1: Device, device 0: USB Audio Ĭard 2: Device_1, device 0: USB Audio # hw:1,0 refers to the device and card listed from the arecord command # This is the recording function, uses FFMpeg. # The input can be changed with the export AUDIODEV= statement, based on arecord -l resultsįfmpeg -f alsa -ac 1 -ar 44100 -i hw:1,0 -t 300 FiveMinuteSample_Mono_44ksampling.wav # SoX uses ALSA and whatever the default audio input device is # This lists all of the audio devices, used in the FFMpeg command These are the key commands used to capture the audio samples arecord -l Since the Raspberry Pi doesn’t have an audio in device built in, I selected the USB microphones. The machine I’m recording on is a Raspberry Pi 3 running Ubnutu Mate. I’m using two cheap USB embedded microphones that I bought for less than $10 each. ![]() In this post I’ll be using two USB microphones to record audio, one for the intended sounds I wanted to record, the other to capture background noise that I want to filter out. ![]()
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