minimodem ☆

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Description:
General-purpose software audio FSK modem

Type: Formula | Tracked Since: Dec 28, 2025

Links: Homepage | formulae.brew.sh

Category: System utilities

Tags: modem fsk audio data-transfer command-line

Install: brew install minimodem

About:
Minimodem is a command-line tool that generates and decodes audio Frequency-Shift Keying (FSK) signals. It allows users to transmit and receive data over standard audio interfaces, such as a sound card or audio jack, effectively turning any computer into a modem. This utility is valuable for simple data transfer, debugging, and interfacing with legacy hardware that uses audio-based communication protocols.

Key Features:

Real-time audio FSK encoding and decoding
Support for multiple standard and custom Bell/RTTY tones
Command-line interface for easy scripting and automation
No special hardware required, uses standard sound card

Use Cases:

Transmitting data between computers via an audio cable
Decoding signals from legacy hardware or radio transmissions
Generating tones for testing audio equipment or circuits

Alternatives:

multimon-ng – More focused on decoding multiple digital transmission modes, often used in security research, whereas minimodem is a general-purpose modem tool.
soundmodem – A Linux kernel driver for packet radio, providing a virtual network interface, while minimodem is a user-space utility for raw FSK.

Version History

Detected	Version	Rev	Change	Commit
Sep 15, 2025 10:45pm		0	VERSION_BUMP	1233b220
Sep 14, 2024 4:13am		0	VERSION_BUMP	65cf4fd8