analog: fastnoise_source_c: use imag part in sample_unbiased()

The complex specialization built both components from s.real(), so every sample had |re| == |im| (phase fixed to odd multiples of pi/4) and the pooled imaginary part was unused.

Adds a test that fails on the previous code.

Signed-off-by: Tim O’Shea tim@deepsig.ai

Version

GNU Radio

GNU Radio is a free & open-source signal processing runtime and signal processing software development toolkit. Originally developed for use with software-defined radios and for simulating wireless communications, it’s robust capabilities have led to adoption in hobbyist, academic, and commercial environments. GNU Radio has found use in software-defined radio, digital communications, nuclear physics, high- energy particle physics, astrophysics, radio astronomy and more!

Helpful Links

How to Run the QT Version of GNU Radio Companion

    # If you want dark mode and GUI tests
    pip install pytest-qt pyautogui QDarkStyle

    # Build and install as usual (described below) and then run
    gnuradio-companion --qt

GNU Radio 4.0

The next major release of GNU Radio, GNU Radio 4.0, is currently under active development in the official GNU Radio 4 repo.

How to Install GNU Radio

Prebuilt Binaries

The recommended way to install GNU Radio on most platforms is using available binary package distributions.

The following command is for Debian, Ubuntu, and derivatives. Consult your distribution information to obtain the version of GNU Radio which is included.

    sudo apt install gnuradio

For other operating systems and versions, see Quick Start

Ubuntu PPA Installation

For Ubuntu, the latest builds (both released and pulled from master branch) are maintained as PPAs (Personal Package Archives) on launchpad.net. Be sure to uninstall any previously installed versions of gnuradio first. See UnInstall GR.

Other Installation Methods

Platform-specific guides and Cross-platform guides are described in Other Installation Methods.

From Source

Complete instructions for building GNU Radio from source code are detailed in Installing From Source.

PyBOMBS

We are no longer recommending PyBOMBS to install modern versions of GNU Radio.

Supporting GNU Radio

If you find GNU Radio useful and would like to support its development, you can make a donation. Your contributions help ensure ongoing improvements and maintenance. Thank you for your support!

Legal Matters

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