Update linux-voice-assistant-2mic-install.md
Added section for implementing AEC.
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imonlinux
@@ -340,6 +340,133 @@ nano ~/linux-voice-assistant/linux_voice_assistant/config.json
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```
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```
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**Enable & start:**
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```bash
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systemctl --user restart linux-voice-assistant.service
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```
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**Verify:**
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```bash
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systemctl --user status linux-voice-assistant --no-pager -l
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```
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</details>
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<details>
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<summary><strong>Optional (Acoustic Echo Cancellation) </strong></summary>
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This optional configuration support the use AEC and require either a working PipeWire-Pulse or PulseAudio backend.
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Enable the echo cancel PulseAudio module:
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```bash
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pactl load-module module-echo-cancel \
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aec_method=webrtc \
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aec_args="analog_gain_control=1 digital_gain_control=1 noise_suppression=1"
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```
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If successfully loaded you will see an ID presented after the command. Keep this ID as you may need it to "tune" the AEC.
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```bash
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pactl load-module module-echo-cancel \
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aec_method=webrtc \
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aec_args="analog_gain_control=1 digital_gain_control=1 noise_suppression=1"
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536870916
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```
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Determine the names of the echo cancellation audio devices. On my system it is "Echo-Cancel Source" and "pipewire/echo-cancel-sink":
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```bash
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~/linux-voice-assistant/linux_voice_assistant/script/run --list-input-devices
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Input devices
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=============
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[0] Built-in Audio Stereo
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[1] Echo-Cancel Source
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```
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```bash
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~/linux-voice-assistant/linux_voice_assistant/script/run --list-output-devices
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Output devices
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==============
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auto: Autoselect device
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pipewire: Default (pipewire)
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pipewire/alsa_output.platform-soc_sound.stereo-fallback: Built-in Audio Stereo
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pipewire/echo-cancel-sink: Echo-Cancel Sink
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pulse/alsa_output.platform-soc_sound.stereo-fallback: Built-in Audio Stereo
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pulse/echo-cancel-sink: Echo-Cancel Sink
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alsa: Default (alsa)
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alsa/sysdefault: Default Audio Device
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alsa/lavrate: Rate Converter Plugin Using Libav/FFmpeg Library
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alsa/samplerate: Rate Converter Plugin Using Samplerate Library
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alsa/speexrate: Rate Converter Plugin Using Speex Resampler
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alsa/jack: JACK Audio Connection Kit
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alsa/oss: Open Sound System
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alsa/pipewire: PipeWire Sound Server
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alsa/speex: Plugin using Speex DSP (resample, agc, denoise, echo, dereverb)
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alsa/upmix: Plugin for channel upmix (4,6,8)
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alsa/vdownmix: Plugin for channel downmix (stereo) with a simple spacialization
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alsa/playback: playback
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alsa/capture: capture
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alsa/dmixed: dmixed
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alsa/array: array
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alsa/plughw:CARD=vc4hdmi,DEV=0: vc4-hdmi, MAI PCM i2s-hifi-0/Hardware device with all software conversions
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alsa/sysdefault:CARD=vc4hdmi: vc4-hdmi, MAI PCM i2s-hifi-0/Default Audio Device
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alsa/hdmi:CARD=vc4hdmi,DEV=0: vc4-hdmi, MAI PCM i2s-hifi-0/HDMI Audio Output
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alsa/dmix:CARD=vc4hdmi,DEV=0: vc4-hdmi, MAI PCM i2s-hifi-0/Direct sample mixing device
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alsa/usbstream:CARD=vc4hdmi: vc4-hdmi/USB Stream Output
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alsa/plughw:CARD=seeed2micvoicec,DEV=0: seeed-2mic-voicecard, bcm2835-i2s-wm8960-hifi wm8960-hifi-0/Hardware device with all software conversions
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alsa/sysdefault:CARD=seeed2micvoicec: seeed-2mic-voicecard, bcm2835-i2s-wm8960-hifi wm8960-hifi-0/Default Audio Device
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alsa/dmix:CARD=seeed2micvoicec,DEV=0: seeed-2mic-voicecard, bcm2835-i2s-wm8960-hifi wm8960-hifi-0/Direct sample mixing device
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alsa/usbstream:CARD=seeed2micvoicec: seeed-2mic-voicecard/USB Stream Output
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jack: Default (jack)
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sdl: Default (sdl)
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```
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**Edit LVA config.json file:**
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```bash
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nano ~/linux-voice-assistant/linux_voice_assistant/config.json
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```
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**Add AEC configuration entries to LVA config.json file:**
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```bash
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"audio": {
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"input_device": "Echo-Cancel Source",
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"input_block_size": 1024,
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"output_device": "pipewire/echo-cancel-sink"
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}
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```
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**Example (LVA config.json file with MQTT, Grove Port, and AEC enabled)**
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***Note: Change the source and sink values to match your system!***
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```bash
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{
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"app": {
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"name": "Linux Voice Assistant"
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},
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"mqtt": {
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"host": "192.168.1.2",
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"port": 1883,
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"username": "mqtt_username",
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"password": "mqtt_password"
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},
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"led": {
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"led_type": "dotstar",
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"interface": "gpio",
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"clock_pin": 13,
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"data_pin": 12,
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"num_leds": 10
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},
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"audio": {
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"input_device": "Echo-Cancel Source",
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"input_block_size": 1024,
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"output_device": "pipewire/echo-cancel-sink"
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}
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}
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```
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**Enable & start:**
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**Enable & start:**
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```bash
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```bash
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systemctl --user restart linux-voice-assistant.service
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systemctl --user restart linux-voice-assistant.service
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