Sonic SDR

A real-time audio spectrum visualizer using ALSA and ncurses, designed to process audio input and display its frequency spectrum as a waterfall plot.

Features

• Captures audio from ALSA-supported devices.
• Configurable sample rate, buffer size, and skip buffers.
• Interactive ncurses-based user interface.
• Real-time visualization of audio frequency spectrum.
• Adjustable frequency range and gain settings.
• Keyboard controls for intuitive interaction.

Prerequisites

• ALSA: Ensure ALSA is installed on your system.
• Ensure your terminal supports RGB colors

Building the Project

1. Clone the repository:

   git clone https://github.com/radiopushka/SonicSDR
   cd SonicSDR

2. Build the project:

   make

Running the Application

Run the program with the following syntax:

./ftaudio
./ftaudio <alsa_device> <sample_rate> <buffer_size> <skip_buffer>

Arguments (optional)

• <alsa_device>: ALSA audio device (default: "default").
• <sample_rate>: Audio sample rate in Hz (default: 48000).
• <buffer_size>: Receive buffer size (default: 4000).
• <skip_buffer>: Number of buffers to skip before visualization (default: 0).

Example

./ftaudio
./ftaudio hw:0,0 44100 2048 1

Keyboard Controls

• ↑: Increase gain.
• ↓: Decrease gain.
• →: Move frequency cursor right.
• ←: Move frequency cursor left.
• Enter: Set the waterfall's maximum frequency.
• Tab: Set the waterfall's minimum frequency.
• r: Reset the frequency range to default.
• h: Display help for controls.
• Space: Pause or resume visualization.
• q: Quit the application.

Output

• Displays the real-time frequency spectrum with adjustable gain and frequency ranges.
• Highlights frequency markers and allows precise control over visualization parameters.

Screenshots

Issues and Contributions

Feel free to report issues or contribute improvements to the project. Open a pull request or file an issue in the issues section.