doc:appunti:linux:audio:audio_recording
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doc:appunti:linux:audio:audio_recording [2020/12/28 17:21] – [Web References] niccolo | doc:appunti:linux:audio:audio_recording [2020/12/28 18:22] (current) – niccolo | ||
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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 // | 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 // | ||
- | |||
- | ====== 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: | ||
- | |||
- | < | ||
- | usb 2-1.3: new full-speed USB device number 9 using ehci-pci | ||
- | usb 2-1.3: New USB device found, idVendor=0c76, | ||
- | 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 / | ||
- | / | ||
- | hid-generic 0003: | ||
- | input, | ||
- | on usb-0000: | ||
- | </ | ||
- | |||
- | {{ linq-usb-audio.png? | ||
- | 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? | ||
- | |||
- | 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? | ||
====== Wireless UHF microphone ====== | ====== Wireless UHF microphone ====== | ||
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See this article about **[[audio_recording_usb_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: | ||
+ | |||
+ | < | ||
+ | usb 2-1.3: new full-speed USB device number 9 using ehci-pci | ||
+ | usb 2-1.3: New USB device found, idVendor=0c76, | ||
+ | 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 / | ||
+ | / | ||
+ | hid-generic 0003: | ||
+ | input, | ||
+ | on usb-0000: | ||
+ | </ | ||
+ | |||
+ | {{ linq-usb-audio.png? | ||
+ | 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? | ||
+ | |||
+ | 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? | ||
====== Web References ====== | ====== Web References ====== |
doc/appunti/linux/audio/audio_recording.txt · Last modified: 2020/12/28 18:22 by niccolo