Audio to Modem Encryption using Orion4D Secret

Encode any text into audio using three different modem-style methods, then decode it back and verify nothing was lost.

Type your message, and this workflow converts it into three audio signals in parallel: AFSK (classic modem tones), OFDM (multi-carrier encoding), and Spectral (frequency-based embedding). Each method produces a playable audio file. A built-in comparator checks the decoded text against your original to confirm the data survived the round trip.

All three encoders run at once. You get audio files you can save, share, or load back in for decoding.

How do you encode text into audio with Orion4D?

Type your text into the input node and hit Run. The workflow encodes it into three parallel audio formats (AFSK, OFDM, Spectral) and decodes each one back to text. A comparator at the end confirms whether the decoded output matches your original, byte for byte.

Your text input This is where everything starts. Paste or type whatever you want to encode. The workflow sends your text to all three encoders at once. Works with long-form text (the demo uses an 883-character block and decodes it with zero errors).

AFSK baud rate (default: 300 Ultra Robust) This controls how fast the modem encodes your data. 300 baud is the slowest and most error-resistant option. Want faster encoding? Higher baud rates exist, but the tradeoff is less resilience to noise and compression. For most use cases, 300 is the right call.

AFSK sample rate (default: 44100) Standard CD-quality sample rate. No need to change this unless you have a specific audio pipeline requirement.

AFSK volume (default: 0.8) How loud the modem tones are in the output audio. 0.8 keeps the signal strong without clipping.

OFDM FEC strength (default: 8) FEC stands for Forward Error Correction. Higher values add more redundancy to protect your data. The OFDM encoder defaults to 8, which balances speed and reliability. Want more protection against lossy compression? Try 16 or higher. The decoder needs to match this value.

Spectral FEC strength (default: 32) Same concept, higher default. The Spectral method is the fastest of the three but does not support MP3. It outputs WAV (lossless). The high FEC default keeps it accurate even for large text blocks.

Audio format (for saving) AFSK and OFDM audio can be saved as MP3. Spectral requires WAV or FLAC. The workflow includes save nodes for both MP3 and lossless formats.

Audio file upload (for decoding) Load a previously encoded audio file back in. The workflow has separate LoadAudio nodes for AFSK/OFDM (MP3 compatible) and for Spectral signals (FLAC/WAV only).

What is audio modem encryption good for?

This workflow is built for anyone who wants to hide text data inside audio files. It gives you three encoding methods to choose from depending on whether you need MP3 compatibility, speed, or maximum error correction.

AFSK is the classic approach. It sounds like a dial-up modem and works after MP3 compression. Good for situations where audio might get re-encoded or transmitted through lossy channels.

OFDM is faster and also survives MP3 compression. It uses multi-carrier frequency encoding, which packs more data into shorter audio. If you need to encode large text and want MP3 support, start here.

Spectral encoding is the fastest option but requires lossless audio (WAV or FLAC). If you control the full pipeline and compression is not a concern, Spectral gives you the best speed.

The built-in text comparator (OrionTextComparator) runs a strict check at the end. It tells you whether the decoded text matches the original and reports the exact length. No guessing about whether your data survived.

Built with the Orion4D custom node pack.

FAQ

Can AFSK audio modem encoding survive MP3 compression? Yes. The AFSK encoder in this workflow supports MP3. The demo saves AFSK audio at 128k MP3 bitrate and decodes it back with zero errors. OFDM also survives MP3. Spectral does not.

What is FEC strength in Orion4D audio encoding? FEC (Forward Error Correction) adds redundancy to protect your encoded data. Higher values mean more protection but longer audio files. The encoder and decoder must use the same FEC strength value or decoding will fail.

Which Orion4D audio encoding method is fastest? Spectral is the fastest, followed by OFDM, then AFSK. The tradeoff: Spectral requires lossless audio formats. If you need MP3 support, use OFDM for speed or AFSK for maximum reliability.

How much text can you encode in one audio file? The demo encodes 883 characters with a full match on decode. Longer text produces longer audio. OFDM and Spectral handle large payloads more efficiently than AFSK due to higher data density.

How do you run Orion4D audio modem encryption online? You can run Orion4D audio modem encryption online through Floyo. No installation, no setup. Open the workflow in your browser, type your text, and hit run. Free to try.