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| author | Andreas Eversberg <jolly@eversberg.eu> | 2016-03-01 18:40:38 +0100 |
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| committer | Andreas Eversberg <jolly@eversberg.eu> | 2016-03-13 09:12:11 +0100 |
| commit | 946c9ce10a92a29584d2e68e9c04fe63dcee7bdc (patch) | |
| tree | f400ab2212900957e358ef236f07307492ecf2d9 /docs/headset.html | |
initial git import
Diffstat (limited to 'docs/headset.html')
| -rw-r--r-- | docs/headset.html | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/docs/headset.html b/docs/headset.html new file mode 100644 index 0000000..8272465 --- /dev/null +++ b/docs/headset.html @@ -0,0 +1,92 @@ +<html> +<head> +<title>osmocom-analog</title> +</head> +<body> +<center><table border='0' cellspacing='0' cellpadding='0' width='816'><tr><td><font face="ARIAL" size='5'> + +<h2><center>Connecting headset</center></h2> + +<p align='justify'> +You need a headset and a second audio device. +I use a cheap 'LogiLink' USB sound adapter and a Headset with microphone. +</p> + +<center><img src="headset.jpg"/></center> + +<p align='justify'> +You may use an USB sound adapter and a headset or a USB headset with built-in sound card. +Check 'alsamixer' if the sound adapter has been detected. +Press 'F6' to select the headset or the sound adapter connected to the headset. +</p> + +<center><img src="alsa-select.png"/></center> + +<p align='justify'> +Mute the microphone, so you wount hear yourself if you speak into the microphone. +Be sure to press 'F3' to change into Playback view. +Mute playback and not recording from microphone. +To mute, select he microphone with the cursor keys and press 'm'. +</p> + +<center><img src="alsa-mute.png"/></center> + +<p align='justify'> +To get the device, run 'arecord -l' and you get the following list, if you have two sound cards: +</p> + +<font size='4'><pre> +# arecord -l +**** List of CAPTURE Hardware Devices **** +card 0: Intel [HDA Intel], device 0: ALC269VB Analog [ALC269VB Analog] + Subdevices: 1/1 + Subdevice #0: subdevice #0 +card 2: Set [C-Media USB Headphone Set], device 0: USB Audio [USB Audio] + Subdevices: 1/1 + Subdevice #0: subdevice #0 +</pre></font> + +<p align='justify'> +You see your card 0 and device 0: This should be the sound card you connect to your radio equipment. +There is also the second sound device: In my case it is card 2 and device 0. +Connect the second sound device to your headset and use '-c hw:2,0" (card 2, device 0) to tell the base station to select this sound device for your headset. +</p> + +<p align='justify'> +To calibrate audio level, run some music player and adjust output volume, so you hear the music at regular speech volume. +Use 'alsamixer' to change the output volume of your second sound card. +This calibartion must be done before calibrating the microphone. +To calibarte input level (mircrophone), run the B-Netz base station with loopback test 3. +</p> + +<font size='4'><pre> +# src/bnetz/bnetz -L 3 -c hw:2,0 +bnetz.c:268 info : Entering IDLE state, sending 'Gruppenfreisignal' 2 on channel 1. +Base station ready, please tune transmitter to 153.010 MHz and receiver to 148.410 MHz. +To call phone, switch transmitter using pilot tone to 153.370 MHz +</pre></font> + +<p align='justify'> +Now you should hear yourself when you speak into the microphone. +You should also notice a short delay, but this is normal. +Now it is time to calibrate the microphone: +Use 'alsamixer' to adjust input level, so that you hear your voice at regular speech volume. +Be sure to select Capture view by pressing 'F4'. +</p> + +<center><img src="alsa-mic.png"/></center> + +<p align='justify'> +I also had to mute the "Auto Gain Control", as found in the Playback View by pressing 'F4'. +I muted it using 'm' key. +</p> + +<p align='justify'> +Finally store the settings using "alsactl store" command. +Do this whenever you want to keep your adjustments. +</p> + +[<a href="index.html">Back to main page</a>] +</font></td></tr></table></center> +</body> +</html> |