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--- doc:appunti:linux:audio:audio_recording_tmb113_e [2020/12/28 09:11] – [Recording with PulseAudio parecord] niccolo
+++ doc:appunti:linux:audio:audio_recording_tmb113_e [2020/12/28 17:09] (current) – [Recording with PulseAudio parecord] niccolo
@@ Line 1: / Line 1: @@
-====== Audio recording with the Acer Travelmate TMB113-E ======
+====== Audio recording with the Acer TravelMate TMB113-E ======
-How to record audio using a **wireless microphone** connected to the audio jack of an **Acer Travelmate TMB113-E**, running  **Debian GNU/Linux 10 Buster**. The microphone is a **[[wp>Lavalier_microphone|lavalier]]** one, with an **UHF** (630 MHz) belt transmitter and a receiver monted on a **1/4" TS jack**.
+{{acer-travelmate-wireless-microphone.jpg?480 |Wireless Microphone on the Acer TravelMate}}
+How to record audio using a **wireless microphone** connected to the audio jack of an **Acer TravelMate TMB113-E**, running  **Debian GNU/Linux 10 Buster**.
+The microphone is a **[[wp>Lavalier_microphone|lavalier]]** one, with an **UHF** (630 MHz) belt transmitter and a receiver mounted on a **1/4" TS jack**. I am mainly interested in recording using **command line tools**.
+===== Electrical connection =====
+I used an headset/microphone **split cable** to connect to the **3.5 mm CTIA audio jack** of the Acer TravelMante and a **self-made cable** to adapt the **TRS 3.5 mm** mic jack to the **1/4" TS jack**. The overall pinout is as follow:
+^ 1/4" TS female jack  ^ Signal         ^ 3.5 mm TRRS male jack (CTIA)  ^
+|                      | Not connected  | **Tip**                       |
+|                      | Not connected  | **Ring**                      |
+| **Sleeve**           | Ground         | **Ring**                      |
+| **Tip**              | Microphone     | **Sleeve**                    |
 ===== Problem detecting the external microphone =====
@@ Line 121: / Line 134: @@
 <code bash>
+#!/bin/sh
 SOURCE='alsa_input.pci-0000_00_1b.0.analog-stereo'
 PORT='analog-input-mic'
 VOLUME=16463
 pacmd set-default-source "$SOURCE"
 pacmd set-source-port "$SOURCE" "$PORT"
@@ Line 131: / Line 144: @@
 parecord --verbose --device="$SOURCE" --channels=1 --fix-rate foobar.wav
 </code>
+The result is a **44100 Hz, 16 bit little-endian, mono** audio file, quite satisfactory for quality and low background noise.
 ===== Microphone plug/unplug events =====