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==== OSX ====
 
==== OSX ====
  
On OSX, go into the System Preferences, click on "Sound", and then the "Output" tab. The listings under "Name" contain the exact device names currently available; if a new audio device is attached to the computer then a new name will appear -- for example "Headphones" for some Macs. Since most such device names contain spaces, make sure to put quotes around the name argument, for example:
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On OSX, go into the System Preferences, click on "Sound", and then the "Output" tab. The listings under "Name" contain the exact device names currently available; if a new audio sink is attached to the computer then a new name will appear -- for example "Headphones" for some Macs. Since most such device names contain spaces, make sure to put quotes around the name argument, for example:
  
 
     spectrum_inversion.py -O "MacBook Pro Speakers"
 
     spectrum_inversion.py -O "MacBook Pro Speakers"
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On Linux, typical choices include:
 
On Linux, typical choices include:
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* pulse
 
* hw:0,0
 
* hw:0,0
 
* plughw:0,0
 
* plughw:0,0
* pulse
 
  
 
For ALSA users with audio trouble, follow this procedure:
 
For ALSA users with audio trouble, follow this procedure:
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* find the entry such as:
 
* find the entry such as:
 
<pre>
 
<pre>
hw:CARD=Generic,DEV=0
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  hw:CARD=Device,DEV=0
    HD-Audio Generic, ALC662 rev3 Analog
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      USB Audio Device, USB Audio
    Direct hardware device without any conversions
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      Direct hardware device without any conversions
 
</pre>
 
</pre>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;from the list which matches your device. To use an HDMI monitor with speakers, find an appropriate entry with "HDMI" in it.
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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;from the list which matches your device.
* use the first line of that entry (e.g. "hw:CARD=Generic,DEV=0") as the device name. Unless the name has spaces in it, the quotes are optional.
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* use the first line of that entry (e.g. "hw:CARD=Device,DEV=0") as the device name (without the quotes).
  
* For issues or debugging, see [[ALSAPulseAudio]].
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* For issues or debugging see https://wiki.gnuradio.org/index.php/ALSAPulseAudio
  
 
==== Windows ====
 
==== Windows ====
  
On Windows, go into the Settings, cllck on "System", click on "Sound", and then the "Output" tab. The listings under "Name" contain the exact device names currently available; if a new audio device is attached to the computer then a new name will appear, for example "Headphones". Since most of the device names contain spaces, make sure to put quotes around the name argument, for example:
+
On Windows, go into the Settings, cllck on "System", click on "Sound", and then the "Output" tab. The listings under "Name" contain the exact device names currently available; if a new audio sink is attached to the computer then a new name will appear, for example "Headphones". Since most of the device names contain spaces, make sure to put quotes around the name argument, for example:
  
 
     "Speakers (Realtek High Definition Audio)"
 
     "Speakers (Realtek High Definition Audio)"

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