A JavaScript 1200 baud audio modem (modulator/demodulator for Bell 202 / AFSK / AX.25)

Demodulator for broadcast FM which includes stereo audio and RDS (radio data system) decoding

Modulator and Demodulator for HAM Radio AX.25 audio signals

Find the potential hidden tech clue in the Beyond the Map's Edge ARKADE song

Demonstration of a QPSK modulator / demodulator in the audio range (with the ability to run it through a real speaker / mic)

Weaver (Third Method) SSB Modulator/Demodulator for Teensy Audio Library

A real-time FM demodulator with audio output for the Ettus Research USRP E310.

audio-to-harmonics additive demodulator

This project mimics a comms system (AM/FM radio transmission) using simulated signals.

verilog implement of pdm modulator and demodulator for pwm, audio and infrared remote

Some audio demodulators using liquid-dsp

Web Audio API binary text FM modulator and demodulator

Finger exercise fsk modulator / demodulator with pulse audio output

Teensy Audio Library Weaver (Third Method) SSB Demodulator for QSD SDR

An audio visual "modulator/demodulator" (modem) in the "web browser" with advanced collaboration and integration capabilities

MATLAB-based DSB-SC demodulator that automatically finds carrier parameters and recovers original audio signals. Uses energy optimization and coherent detection to extract hidden messages from modulated files.

This project involves using Matlab to record audio signal data, sychronise and decode wspr messages. I have used my own algorithm and built in matlab functions to capture the audio, sync and identify candidate signal frequencies. The channel symbol decoding algorithm is provided Refernece credit to Dr. Jonathon Y. Cheah (NZ0C) whose code is derived in turn from from the original wsprd.c code, part of program wsprd, a detector/demodulator/decoder for the Weak Signal Propagation Reporter (WSPR) mode. File name: wsprd.c Copyright 2001-2018, Joe Taylor, K1JT Much of the present code is based on work by Steven Franke, K9AN, which in turn was based on earlier work by K1JT