


How can I visualize real-time audio signals in Qt using Qwt Oscilloscope?
Oct 28, 2024 pm 04:16 PMPlotting Real-Time Data on (qwt) Oscillocope
In order to visualize an audio signal recorded through Qt using QAudioInput and QIODevice, you can utilize the following steps:
Timebase:
- Determine the input signal sampling frequency (fsmpl).
- Calculate the maximum detectable frequency as fsmpl/2.
- Set the lower limit of the timebase based on the buffer length.
Drawing:
-
Create a function to render the sampling buffer from a specified start address, accommodating:
- Y-scale for amplitude adjustment
- Y-offset for vertical beam positioning
- X-offset for time shift or horizontal positioning
Level:
-
Implement a function simulating the Level functionality:
- Search the buffer from the start address
- Stop when the amplitude crosses the specified level
- Configure various modes for level detection, such as amplitude crossing levels or relative edge detection
Preview:
- Trigger the level function at regular intervals to identify the start address.
- Call the draw function with the updated start address, adding the timebase period to it.
Multichannel:
- Split the interlaced data coming from a single buffer into separate channels (e.g., left and right).
- Incorporate level source and render mode options for each channel.
Miscel Stuff:
-
Enable additional features like:
- Analog knob settings for amplitude, timebase, level, and offsets
- Discrete settings for level mode and channel options
- Filters emulating capacitance or grounding
GUI:
- Design an intuitive graphical user interface (GUI) with a range of analog and discrete settings.
Trigger:
- Trigger all channels simultaneously based on a defined condition.
- For instance, search for when the left channel amplitude rises above a specified level and start drawing from that point.
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