# Polyglot Radio: Acoustic SDR — Acoustic SDR Modem & Monitor

> Acoustic SDR Modem & Monitor (iPhone/iPad app by Kevin P. Thorne.)

- Source: https://appshunter.io/ios/app/polyglot-radio-acoustic-sdr/id6813724014 (this page in markdown: same URL + `.md`)
- Developer: [Kevin P. Thorne](https://appshunter.io/developer/6773113192)
- Category: Utilities
- Price: Free
- Age rating: 4+
- Requires: iOS 14.0 · 21 MB
- Languages: American English
- Released: 2026-09-23
- Data updated: 2026-10-26

## What is Polyglot Radio?

Polyglot Radio harnesses your device’s built-in speaker and microphone to send and receive digital and analog waveforms through the air. Powered by a high-performance native C++20 DSP core and a modern Flutter interface, Polyglot Radio continuously scans, arbitrates, decodes, and transmits 11 acoustic and near-ultrasound communication protocols—no extra radio hardware required!

KEY FEATURES
Autonomous Parallel Sentry: No manual mode switching required. Polyglot Radio simultaneously monitors matched-filter and energy-bank correlations across all supported waveforms, auto-detecting incoming preambles, VIS codes, and sync words to promote the correct decoder instantly.
Real-Time Spectrogram Waterfall: Visualize incoming audio signals with a fluid, 512-bin rolling FFT waterfall running at 30 FPS.
Zero-Copy Shared Canvas: Watch analog image sweeps decode line-by-line in real time on a dedicated 640×496 RGBA canvas (SSTV, HF WEFAX, and Hellschreiber).
Smart RMS Squelch & Pre-Buffer Slicing: Dynamic noise-floor tracking with hysteresis and a rolling 5-second buffer ensures fast preamble bursts are never clipped or lost.
Burst Archival & Offline Demodulation: Unrecognized signals exceeding squelch are automatically preserved to local storage as "Unknown Bursts." Re-run demodulation anytime, or import your own .wav files for offline decoding.
Near-Ultrasound Data Transfer: Transmit and receive data silently over 18.5–19.8 kHz using 16-FSK with linear chirp preambles and Reed-Solomon RS(15,9) forward error correction.
Amateur Radio Compliance Built-In: Station ID verification strictly gates transmission of amateur packet modes (APRS / AX.25) until an authorized callsign is entered.

SUPPORTED WAVEFORMS & PROTOCOLS
SSTV (Slow Scan Television): Robot 36, Robot 72, Martin 1 & 2, Scottie 1 & 2, PD-120 with live VIS sync and image rendering.
Near-Ultrasound Data Modem: Inaudible 19 kHz 16-FSK carrier with Reed-Solomon error correction.
APRS / AX.25: 1200-baud Bell 202 AFSK packet framing.
CW (Morse Code): Variable 5–45 WPM smooth envelope transmission and audio decoding.
PSK31: 31.25-baud BPSK with Varicode text transmission.
Olivia MFSK: Multi-tone FSK with Walsh-Hadamard transform.
HF WEFAX: 120 LPM maritime weather facsimile decoding onto the shared visual canvas.
FT8: 8-GFSK Costas array framing.
EAS / SAME: Dual-tone emergency alert transmission and SAME header generator.
Feld-Hell (Hellschreiber): 122.5-baud dot-matrix facsimile transmission and raster engine.
Rattlegram (COFDM): Experimental orthogonal frequency-division multiplexing transmission.

## Is Polyglot Radio safe?

Not enough ratings yet to assess Polyglot Radio.

## Is Polyglot Radio legit?

Polyglot Radio: Acoustic SDR has limited verification signals. The AppsHunter Legitimacy Score for Polyglot Radio is 58 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 1 release)

### 0.1.0 — 2026-09-23

No release notes.

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## Related topics

[sdr control](https://appshunter.io/ios/topics/sdr-control) · [rtl sdr](https://appshunter.io/ios/topics/rtl-sdr) · [sdr radio](https://appshunter.io/ios/topics/sdr-radio)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-26.*