Difference between revisions of "Audio Sink"

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(revised Parameters section)
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== Parameters ==
 
== Parameters ==
  
; Sample Rate
+
=== Sample Rate ===
: Audio sampling rate used, click the drop-down menu to see popular rates.  Note, not all sampling rates will be supported by your hardware. For typical applications, this should be set to 48kHz.  
+
To set the Audio sampling rate, click the drop-down menu to see popular rates.  Note: not all sampling rates will be supported by your hardware. For typical applications, this should be set to 48kHz.  
  
; Device Name
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=== Device Name ===
: Leave the device name blank to choose default audio device. ALSA users with audio trouble may try setting the device name to plughw:0,0
+
Leave the device name blank to choose the default audio device. Other typical choices include:
 +
* pulse
 +
* hw:0,0
 +
* plughw:0,0
 +
For ALSA users with audio trouble, follow this procedure:
 +
* from a terminal window enter:
 +
<code>aplay -L</code>
 +
* find the entry such as:
 +
<pre>
 +
  hw:CARD=Device,DEV=0
 +
      USB Audio Device, USB Audio
 +
      Direct hardware device without any conversions
 +
</pre>
 +
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;from the list which matches your device.
 +
* use the first line of that entry (e.g. "hw:CARD=Device,DEV=0") as the device name (without the quotes).
  
; OK to Block
+
* For issues or debugging see https://wiki.gnuradio.org/index.php/ALSAPulseAudio
: On by default, which should be used when the source is not throttled, e.g. generating a signal within GNU Radio or reading it from a file, meaning the audio sink has to be responsible for deciding when it's time to take more samples. If it's set to Off, then the Audio Sink will discard samples rather than the internal buffers filling up and causing the RF source block to have to discard them instead.
 
  
; Num Inputs
+
=== OK to Block ===
: The audio sink can have multiple inputs depending upon your hardware. For example, set the inputs to 2 for stereo audio, or 1 for mono.
+
On by default, which should be used when this sink is not throttled by any other block.
  
For issues or debugging see https://wiki.gnuradio.org/index.php/ALSAPulseAudio
+
=== Num Inputs ===
 +
The audio sink can have multiple inputs depending upon your hardware. For example, set the inputs to 2 for stereo or 1 for mono.
  
 
== Example Flowgraph ==
 
== Example Flowgraph ==

Revision as of 02:10, 30 October 2019

Allows a signal to be played through your speakers or other audio device

Parameters

Sample Rate

To set the Audio sampling rate, click the drop-down menu to see popular rates. Note: not all sampling rates will be supported by your hardware. For typical applications, this should be set to 48kHz.

Device Name

Leave the device name blank to choose the default audio device. Other typical choices include:

  • pulse
  • hw:0,0
  • plughw:0,0

For ALSA users with audio trouble, follow this procedure:

  • from a terminal window enter:

aplay -L

  • find the entry such as:
   hw:CARD=Device,DEV=0
       USB Audio Device, USB Audio
       Direct hardware device without any conversions

      from the list which matches your device.

  • use the first line of that entry (e.g. "hw:CARD=Device,DEV=0") as the device name (without the quotes).

OK to Block

On by default, which should be used when this sink is not throttled by any other block.

Num Inputs

The audio sink can have multiple inputs depending upon your hardware. For example, set the inputs to 2 for stereo or 1 for mono.

Example Flowgraph

This flowgraph should play a 1 kHz tone out of your speakers. Note that you don't need a throttle block, the Audio Sink should throttle for you. If you do end up using an already-throttled signal source, then set "OK to Block" to No.

Audio-sink-ex.png