inspectrum

inspectrum is a tool for analysing captured signals, primarily from software-defined radio receivers.

Try it

Prerequisites

• boost >=1.35
• gnuradio 3.7.x
• qt5
• fftw 3.x
• cmake
• pkg-config

Building on Debian-based distros

sudo apt-get install qt5-default libfftw3-dev cmake pkg-config
mkdir build
cd build
cmake ..
make
sudo make install

Building on OSX - Homebrew

brew install qt5 fftw cmake pkg-config
mkdir build
cd build
CMAKE_PREFIX_PATH=$(brew --prefix qt5)/lib/cmake cmake ..
make install

Building on OSX - Macports

sudo port install fftw-3-single cmake pkgconfig qt5
mkdir build
cd build
cmake ..
make
sudo make install

Run

./inspectrum

Input

inspectrum supports the following file types:

• *.cf32, *.cfile - Complex 32-bit floating point samples (GNURadio, osmocom_fft)
• *.cs16 - Complex 16-bit signed integer samples (BladeRF)
• *.cs8 - Complex 8-bit signed integer samples (HackRF)
• *.cu8 - Complex 8-bit unsigned integer samples (RTL-SDR)

If an unknown file extension is loaded, inspectrum will default to *.cf32.

Features

• Spectrogram with zoom/pan
• Large (multi-gigabyte) file support

Goals

• Be fast and light
• Make as many settings as possible work in realtime. I want this to be a useful tool for visually learning about DSP by tweaking around with things like FFT settings, filter widths or clock synchronisation.
• Support large files - as large as possible, but at least several GBs.
• Future features: filtering, demodulation, clock sync. Probably based on GNURadio.

Contact

• #inspectrum on freenode IRC