Differences

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--- doc:appunti:linux:audio:audio_recording [2020/12/28 10:08] – niccolo
+++ doc:appunti:linux:audio:audio_recording [2020/12/28 18:22] (current) – niccolo
@@ Line 88: / Line 88: @@
 The **2.6 volt** current provided by the USB adapter on th **jack ring** will go nowhere (not connected). The **2.6 volt** current provided on the **jack tip** is probably not required by the UHF receiver, but **it should not harm**. **No infromation** is available about **microphone impedence** expected by the USB adapter, on the other hand no information is available about the **impedence of the mic interface** of the UHF receiver.
-Despite all this empirical approach, the **voice registration is quite satisfying**!
+Despite all this empirical approach, the **voice registration is quite satisfying**! See below about connecting the microphone to an Acer TravelMate notebook an to an Android smartphone.
-===== Problem: silence gaps using a cheap USB dongle =====
+===== Wireless mic on the Acer Travelmate TMB113-E =====
+See this article about **[[audio_recording_tmb113_e]]**.
+===== Wireless mic on Android =====
+See this article about **[[audio_recording_android]]**.
+===== Wireless mic on Ugreen USB audio adapter =====
+See this article about **[[audio_recording_usb_adapter]]**.
+====== Problem: silence gaps using a cheap USB dongle ======
 I was **unable to use the microphone connector** on my Acer TravelMate, so I tried to use an USB dongle, marked **LinQ**. The device was detected by the Linux Kernel 4.9.0:
@@ Line 117: / Line 129: @@
 {{audacity-track-gaps.png?direct&400|}}
-====== External mic on the Acer Travelmate TMB113-E ======
+====== Web References ======
-See this article about **[[audio_recording_tmb113_e]]**.
-====== External mic on Android ======
-See this article about **[[audio_recording_android]]**.
-===== Ugreen USB audio adapter =====
-The device is detected by the Linux Kernel 4.9.0 in this way:
-<code>
-usb 2-1.3: new full-speed USB device number 5 using ehci-pci
-usb 2-1.3: New USB device found, idVendor=0d8c, idProduct=0024
-usb 2-1.3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
-usb 2-1.3: Product: USB Advanced Audio Device
-usb 2-1.3: Manufacturer: C-Media Electronics Inc.
-input: C-Media Electronics Inc. USB Advanced Audio Device as /devices/pci0000:00/0000:00:1d.0
-    /usb2/2-1/2-1.3/2-1.3:1.3/0003:0D8C:0024.0004/input/input18
-hid-generic 0003:0D8C:0024.0004:
-    input,hidraw2: USB HID v1.11 Device [C-Media Electronics Inc. USB Advanced Audio Device]
-    on usb-0000:00:1d.0-1.3/input3
-</code>
-{{ ugreen-usb-audio.jpg?direct&220|Ugreen USB Audio Adapter}}
-Launching **alsamixer** and hitting F6 you can select the **USB Advanced Audio Device** sound card. Hit F4 to view the only one capture device, i.e. the microphone input line. Press **Space** to enable/disable the **capture** and **Up/Down arrows** to increase/decrease the **gain**.
-It seems that the best setting for audio recording through the mic, is to keep the **capture mic gain to 100**:
-{{usb-advanced-audio-device-alsamixer.png?direct&300|USB Advenced Audio Device in Alsamixer}}
-The **microphone socket** is a **3.5 mm TRS type** (three poles), it provides a bias current of **2.6 V** on both the **tip** and the **ring**, so it is advisable, as reported in the device manual, to **NOT use a simple two poles mono jack** (TS type), because it will short-circuit the bias current on the ring with the ground on the sleeve.
-===== Web References =====
   * [[wp>Microphone]]