schakal00783andClaude Fable 5
7391b0ded7
Cepstral-Beweis auf #71: stabiler 80ms-Peak nur auf Gegenseiten-Segmenten = Muschel-Bleed durchs offene Mikro zusaetzlich zum digitalen Pfad. cr_mic2mix-Loopback entfernt, stattdessen pw-link micgate.out -> callmix (Fallback ohne Gate bleibt). Verschmierte Embeddings (verschmolzene Remote-Sprecher) sollten damit ebenfalls weg sein - echter Call offen. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_0113vDKdSNtD3Dwcw4QMu9yV
120 lines
6.5 KiB
Bash
120 lines
6.5 KiB
Bash
#!/bin/bash
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# CallRec USB-headset audio topology (persistent).
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# Logitech H390 = user mic + user ears. UAC2 gadget = PC bridge.
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# - PC audio (gadget capture, PC->device) -> headset sink (user hears Windows)
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# - PC audio -> callmix (far side of the recording)
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# - headset mic -> callmix (near side of the recording)
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# - headset mic -> micgate -> gadget sink (device->PC) (far end / PC hears the user)
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# CallRec records callmix.monitor (both sides).
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# Idempotent: if callmix already exists, does nothing.
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#
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# NOISE GATE (2026-07-08): the user's boom mic picks up the far-end acoustically
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# (proven: muting the Logi mic silences the gadget sink completely; NOT via the
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# headset earcup). Teams/Discord AGC then renormalizes it, so lowering mic gain
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# alone does nothing -- the far end hears itself with the loopback round-trip
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# delay. Fix: route mic->PC THROUGH a LADSPA gate (aime-micgate.service, sink
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# "micgate"). In the user's speech pauses the gate closes -> the gadget sink goes
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# to absolute silence -> the far end can't hear itself; AGC can't amplify silence.
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# Mic HW gain is kept LOW (not the old +11 dB max) on purpose: it keeps the idle
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# bleed below the gate threshold (-45 dB), so the gate stays shut when the user is
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# quiet even while the far end is loud.
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set -u
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export XDG_RUNTIME_DIR=/run/user/1000
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PCAUD=alsa_input.platform-fc000000.usb.stereo-fallback # PC->device (Windows playing)
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PCSINK=alsa_output.platform-fc000000.usb.stereo-fallback # device->PC (what Windows records)
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HSSINK=alsa_output.usb-Logi_USB_Headset_Logi_USB_Headset-00.analog-stereo
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HSMIC=alsa_input.usb-Logi_USB_Headset_Logi_USB_Headset-00.mono-fallback
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# already configured?
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if pactl list sinks short 2>/dev/null | grep -qw callmix; then
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echo "callmix already present; nothing to do"
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exit 0
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fi
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# wait for the gadget + headset PipeWire nodes to appear (headset/UAC2 enumerate
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# a little after boot)
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for i in $(seq 1 60); do
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if pactl list sources short 2>/dev/null | grep -q "$PCAUD" \
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&& pactl list sinks short 2>/dev/null | grep -q "$HSSINK" \
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&& pactl list sources short 2>/dev/null | grep -q "$HSMIC"; then
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break
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fi
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sleep 1
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done
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# wait briefly for the noise-gate sink (aime-micgate.service, a separate pipewire
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# filter-chain client). Route the user's mic THROUGH it if present; fall back to
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# the raw gadget sink so mic->PC still works even if the gate failed to start.
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MIC_OUT="$PCSINK"
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for i in $(seq 1 15); do
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if pactl list sinks short 2>/dev/null | grep -qw micgate; then MIC_OUT=micgate; break; fi
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sleep 1
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done
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# set the volume of a loopback's sink-input, found by its media.name tag (robust
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# across reboots / stream-restore reshuffles, unlike numeric indices).
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si_vol() { # $1 = media.name, $2 = volume (e.g. 60%)
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local si
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si=$(pactl list sink-inputs 2>/dev/null | awk -v n="$1" '
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/^Sink Input #/{id=$3; gsub("#","",id)}
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index($0, "media.name = \"" n "\""){print id; exit}')
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[ -n "$si" ] && pactl set-sink-input-volume "$si" "$2" >/dev/null 2>&1
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}
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# headset mic hardware gain kept LOW (see NOISE GATE note): +1.4 dB, not +11 max.
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# Low analog gain -> low idle bleed -> gate stays shut in the user's pauses.
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amixer -c Headset sset Mic 12 unmute >/dev/null 2>&1 # belt (overridden by the source-vol below)
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pactl set-source-volume "$HSMIC" 62% >/dev/null 2>&1 # WirePlumber-owned; 62%% -> HW Mic step 12 (~+1.4 dB). 100%% would map to +11 dB max and re-open the gate on far-end bleed.
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# virtual recording mix
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pactl load-module module-null-sink sink_name=callmix \
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sink_properties=device.description=CallRecMix >/dev/null 2>&1
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pactl set-sink-volume callmix 100% >/dev/null 2>&1
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# routes — each loopback tagged so we can set per-stream gain by name
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pactl load-module module-loopback source="$PCAUD" sink="$HSSINK" latency_msec=60 sink_input_properties=media.name=cr_pc2hs >/dev/null 2>&1 # PC -> headset (monitor)
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pactl load-module module-loopback source="$PCAUD" sink=callmix latency_msec=60 sink_input_properties=media.name=cr_pc2mix >/dev/null 2>&1 # PC -> mix
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pactl load-module module-loopback source="$HSMIC" sink="$MIC_OUT" latency_msec=60 sink_input_properties=media.name=cr_mic2pc >/dev/null 2>&1 # mic -> (gate ->) PC
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# mic -> mix: GATED. The old direct HSMIC->callmix loopback put the far end into
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# the recording TWICE — digitally (cr_pc2mix) AND ~80 ms later as earcup bleed
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# through the always-open mic (cepstral peak 79-80 ms on #71) -> far-end voices
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# sounded like a reverberant room AND their smeared embeddings made diarization
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# merge two remote speakers into one. Tapping the gate's OUTPUT instead keeps the
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# mic out of the mix in the user's speech pauses (same trick as the Teams
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# self-echo fix / iPhone uplink). Fallback: no gate -> old direct loopback.
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if [ "$MIC_OUT" = micgate ]; then
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for i in $(seq 1 10); do
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pw-link micgate.out:output_FL callmix:playback_FL >/dev/null 2>&1 && \
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pw-link micgate.out:output_FR callmix:playback_FR >/dev/null 2>&1 && break
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sleep 1
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done
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else
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pactl load-module module-loopback source="$HSMIC" sink=callmix latency_msec=60 sink_input_properties=media.name=cr_mic2mix >/dev/null 2>&1 # mic -> mix (UNgated fallback)
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fi
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# GAIN STAGING (clip-safe): PC media hits ~0 dBFS, so knock it down hard in the
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# mix; the mic runs near unity. Their sum must never reach 0 dBFS or clipping
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# corrupts whisper + diarization (over-segments to many speakers). PC monitoring
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# to the headset (cr_pc2hs) stays at unity — full volume.
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sleep 1
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si_vol cr_pc2mix 60% # far side into the recording (~-12 dB)
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si_vol cr_mic2mix 100% # near side (user) into the mix — only exists in the UNgated fallback
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si_vol cr_mic2pc 65% # near side to the far end (through the gate)
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# NOTE: fine mic/PC balance still wants tuning on a REAL call. If the far end
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# finds the user too quiet, raise cr_mic2pc / Mic gain -- but watch the gate:
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# more gain -> more idle bleed -> may cross the -45 dB threshold and re-open the
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# gate on the far-end bleed (echo returns). Retune the gate Threshold together.
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# expose the mix as a REAL source (not a .monitor) so the CallRec UI lists it —
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# recorder.js listSources() filters out every *.monitor.
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pactl load-module module-remap-source master=callmix.monitor source_name=callrec_mix \
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source_properties=device.description=CallRecMix >/dev/null 2>&1
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# defaults: user hears via headset, CallRec records the mix
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pactl set-default-sink "$HSSINK" >/dev/null 2>&1
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pactl set-default-source callrec_mix >/dev/null 2>&1
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echo "aime usb-audio topology loaded (mic->PC via micgate=$MIC_OUT)"
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