sdrangel/plugins/samplesource/audioinput
Kacper Michajłow f2d01b61d3 Avoid global QString init in plugins
This workarounds issue with LTO with GCC #716
2020-11-22 04:06:32 +01:00
..
CMakeLists.txt Audio Input: implemented worker + thread 2020-11-13 16:22:29 +01:00
audioinput.cpp Audio input: fixed improper initialization of m_worker 2020-11-21 18:55:41 +01:00
audioinput.h Fixed -Wunused-parameter warnings 2020-11-14 11:13:32 +01:00
audioinputgui.cpp Fixed -Wunused-parameter warnings 2020-11-14 11:13:32 +01:00
audioinputgui.h Audio Input: quarter sample rate heterodyne for mono signals 2020-11-13 19:55:09 +01:00
audioinputgui.ui Audio Input: quarter sample rate heterodyne for mono signals 2020-11-13 19:55:09 +01:00
audioinputplugin.cpp Avoid global QString init in plugins 2020-11-22 04:06:32 +01:00
audioinputplugin.h Avoid global QString init in plugins 2020-11-22 04:06:32 +01:00
audioinputsettings.cpp Rebase to master 2020-11-09 21:12:08 +00:00
audioinputsettings.h Don't add alsa realm suffix, as there do not appear to be duplicate names 2020-11-09 21:12:40 +00:00
audioinputwebapiadapter.cpp Fixed -Wunused-parameter warnings 2020-11-14 11:13:32 +01:00
audioinputwebapiadapter.h Rebase to master 2020-11-09 21:12:08 +00:00
audioinputworker.cpp Audio Input: quarter sample rate heterodyne for mono signals 2020-11-13 19:55:09 +01:00
audioinputworker.h Audio Input: quarter sample rate heterodyne for mono signals 2020-11-13 19:55:09 +01:00
readme.md Audio Input: quarter sample rate heterodyne for mono signals 2020-11-13 19:55:09 +01:00

readme.md

Audio input plugin

Introduction

This input sample source plugin gets its samples from an audio device.

Interface

Audio input plugin GUI

1: Start/Stop

Device start / stop button.

  • Blue triangle icon: device is ready and can be started
  • Green square icon: device is running and can be stopped
  • Magenta (or pink) square icon: an error occurred. In the case the device was accidentally disconnected you may click on the icon, plug back in and start again.

2: Device

The audio device to use.

3: Refresh devices

Refresh the list of audio devices.

4: Audio sample rate

Audio sample rate in Hz (Sa/s).

5: Decimation

A decimation factor to apply to the audio data. The baseband sample rate will be the audio sample, divided by this decimation factor.

6: Volume

A control to set the input volume. This is not supported by all input audio devices.

7: Channel Map

This controls how the left and right audio channels map on to the IQ channels.

  • Mono L - Real samples are taken from the left audio channel and are heterodyned by the fourth of the sample rate (fs/4) to obtain complex samples. Therefore the spectrum of the complex baseband is centered at the fourth of the sample rate (fs/4). As per Nyquist rule only a bandwidth of half of the sample rate (fs/2) is available for real signals. Frequencies outside the [0, fs/2] interval are artefacts and can be eliminated by decimating by a factor of 2.
  • Mono R - Same as above but takes the right audio channel for the real signal.
  • I=L, Q=R - The left audio channel is driven to the I channel. The right audio channel is driven to the Q channel for a complex (analytic signal)input.
  • I=R, Q=L - The right audio channel is driven to the I channel. The left audio channel is driven to the Q channel for a complex (analytic signal)input.