doc:appunti:linux:audio:audio_recording
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| Both sides previous revisionPrevious revision | Next revisionBoth sides next revision | ||
| doc:appunti:linux:audio:audio_recording [2019/04/23 12:52] – [Web References] niccolo | doc:appunti:linux:audio:audio_recording [2019/05/22 15:51] – [Electrical compatibility and hardware autodetection] niccolo | ||
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| As stated above, the first problem is **powering the microphone** itself, because generally we will use an **electret** one. It is a **common practice** to provide the power on the same line of the microphone signal, so **requiring just two wires** for both power (from the device to the mic) and for signal (from the mic to the device). The power, also called //bias current//, is generally in the range of **2.5** to **5.0 volt**. | As stated above, the first problem is **powering the microphone** itself, because generally we will use an **electret** one. It is a **common practice** to provide the power on the same line of the microphone signal, so **requiring just two wires** for both power (from the device to the mic) and for signal (from the mic to the device). The power, also called //bias current//, is generally in the range of **2.5** to **5.0 volt**. | ||
| - | FIXME: How much current | + | On a Xiaomi Mi A1 smartphone, which has a **TRRS 3.5 mm jack, CTIA standard**, we measured a bias current |
| Another parameter which should be considered is the **impedence** FIXME | Another parameter which should be considered is the **impedence** FIXME | ||
doc/appunti/linux/audio/audio_recording.txt · Last modified: 2020/12/28 18:22 by niccolo