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--- doc:appunti:linux:audio:audio_recording [2020/12/28 17:20] – [Wireless mic on Ugreen USB audio adapter] niccolo
+++ doc:appunti:linux:audio:audio_recording [2020/12/28 18:22] (current) – niccolo
@@ Line 56: / Line 56: @@
 Unlike capacitor ones, electret microphones **do not require polarizing voltage**, but generally they contain an integrated preamplifier that **does require power**. In this cases a **TRS jack** can be used, where the ring carries power via a resistor from, normally, a 5 V supply in the computer (often incorrectly called //polarizing power// or //bias//). Generally these microphones built to be plugged into computers and electronic audio devices, have a **TRS 3.5 mm jack**, carrying the mic signal and the required current.
-====== 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:
-<code>
-usb 2-1.3: new full-speed USB device number 9 using ehci-pci
-usb 2-1.3: New USB device found, idVendor=0c76, idProduct=1607
-usb 2-1.3: New USB device strings: Mfr=0, Product=1, SerialNumber=0
-usb 2-1.3: Product: USB Headphone Set
-input: USB Headphone Set as /devices/pci0000:00/0000:00:1d.0
-    /usb2/2-1/2-1.3/2-1.3:1.3/0003:0C76:1607.0004/input/input92
-hid-generic 0003:0C76:1607.0004:
-    input,hidraw2: USB HID v1.00 Device [USB Headphone Set]
-    on usb-0000:00:1d.0-1.3/input3
-</code>
-{{ linq-usb-audio.png?direct&100|LinQ USB audio dongle}}
-The USB audio adapter worked quite nicely at playing audio, I use it on a QNAP TS-120 NAS, transformed into a media player installing Debian GNU/Linux on it. The Linux kernel and the **ALSA audio subsystem** works well on setting the levels for **playback**.
-Once started Audacity, I was able to select the microphone line of the USB dongle as a **capture device**:
-{{audacity-select-usb-audio.png?direct&260|}}
-Recording a sample track revealed an annoying problem: about **every 0.4 seconds** you can see a **gap of silence** in the audio track of about **two hundredths of a second**. The audio track is unusable!
-{{audacity-track-gaps.png?direct&400|}}
 ====== Wireless UHF microphone ======
@@ Line 129: / Line 102: @@
 See this article about **[[audio_recording_usb_adapter]]**.
-===== Web References =====
+====== 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:
+<code>
+usb 2-1.3: new full-speed USB device number 9 using ehci-pci
+usb 2-1.3: New USB device found, idVendor=0c76, idProduct=1607
+usb 2-1.3: New USB device strings: Mfr=0, Product=1, SerialNumber=0
+usb 2-1.3: Product: USB Headphone Set
+input: USB Headphone Set as /devices/pci0000:00/0000:00:1d.0
+    /usb2/2-1/2-1.3/2-1.3:1.3/0003:0C76:1607.0004/input/input92
+hid-generic 0003:0C76:1607.0004:
+    input,hidraw2: USB HID v1.00 Device [USB Headphone Set]
+    on usb-0000:00:1d.0-1.3/input3
+</code>
+{{ linq-usb-audio.png?direct&100|LinQ USB audio dongle}}
+The USB audio adapter worked quite nicely at playing audio, I use it on a QNAP TS-120 NAS, transformed into a media player installing Debian GNU/Linux on it. The Linux kernel and the **ALSA audio subsystem** works well on setting the levels for **playback**.
+Once started Audacity, I was able to select the microphone line of the USB dongle as a **capture device**:
+{{audacity-select-usb-audio.png?direct&260|}}
+Recording a sample track revealed an annoying problem: about **every 0.4 seconds** you can see a **gap of silence** in the audio track of about **two hundredths of a second**. The audio track is unusable!
+{{audacity-track-gaps.png?direct&400|}}
+====== Web References ======
   * [[wp>Microphone]]