# jgaeddert/liquid-dsp

digital signal processing library for software-defined radios

Repository: https://github.com/jgaeddert/liquid-dsp
Canonical: https://ross.abutalabs.com/products/liquid-dsp
Homepage: http://liquidsdr.org
Language: C
License: MIT
License Family: permissive
Last push: 2026-08-22T19:34:59+00:00

## Health v2 (maintenance only)
Score: 94/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 84, longevity 100
- inputs: {"age_days": 5962, "days_push": 11, "days_rel": 26, "gap_med": 49, "n_releases_24m": 4}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2282, forks 512 (observed 2026-08-28T04:06:33.911402+00:00)

## What it is
liquid-dsp is a free and open-source digital signal processing library written in C, designed specifically for software-defined radios on embedded platforms. It provides flexible, scalable DSP modules including filters, oscillators, modems, synchronizers, and forward error-correction coding with minimal external dependencies.

## Use cases
- implement digital modulation and demodulation for software-defined radios
- design and apply FIR filters for signal processing
- perform fast Fourier transforms on embedded hardware
- add forward error-correction coding to a wireless link
- build a software modem for data transmission over radio
- simulate communication channels with noise and interference
- process radio signals on a Raspberry Pi or other embedded board

## When to choose
- you need a lightweight, dependency-free DSP library in C for SDR applications
- you are developing radio software for embedded or resource-constrained platforms
- you need modems, filters, synchronizers, or FEC in one cohesive library
- you want portable signal processing code that runs on ARM devices like the Raspberry Pi

## When to avoid
- you need GPU-accelerated or massively parallel signal processing
- you require a high-level language API like Python or MATLAB as the primary interface
- you are building audio or image applications rather than radio communications
- you need extensive Windows support, which the author acknowledges is limited

## Facets
- artifact type: library
- maturity: stable
- function: math, sdk
- domain: embedded-systems, hardware
- platform: windows, cross-platform, embedded
- tags: dsp, software-defined-radio, sdr, c, modem, filters, fft, error-correction, telecommunications, signal-processing, linux, macos

## Member repositories
- jgaeddert/liquid-dsp (main) score 94

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:06:33.911402+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T02:41:19.747631+00:00, confidence not recorded.
  - readme: https://github.com/jgaeddert/liquid-dsp (fetched 2026-08-28T04:06:33.911402+00:00, sha 6d6ca98f6e04)
  - homepage: http://liquidsdr.org (fetched 2026-08-29T10:21:36.878061+00:00, sha 44bdf0cff13e)
  - site_page: https://liquidsdr.org/blog/raspberry-pi3-benchmarks (fetched 2026-08-29T10:21:36.880603+00:00, sha 507d15767230)
  - site_page: https://liquidsdr.org/faq (fetched 2026-08-29T10:21:36.882736+00:00, sha 4de9f5b9a584)
  - site_page: https://liquidsdr.org/doc (fetched 2026-08-29T10:21:36.884369+00:00, sha 6e961d511f6e)
- Data as of 2026-08-30T08:39:29.467469+00:00.