Audio Watermarking Tools is a family of softwaredigital audio watermarking core engines. The family consists of several different technologies, each having its unique features and capabilities, thus making them applicable in different applications and use-cases.

 AWT1     

Audio Watermarking Tools 1 (AWT1) — a watermarking, "digital signing" solution realizing so called "strict watermarking" approach in the sense that the source (not watermarked) audio data is required in order to find and decode watermark in the watermarked recording. Watermark extraction is performed by “comparing” source and watermarked streams. Simple and effective watermarking solution demonstrating extreme, insane watermark robustness.
Details, examples, FAQ and free demo
 

 AWT2     

Audio Watermarking Tools 2 (AWT2) — flagship watermarking, "digital signing" solution in the AWT family. AWT2 realizes so called "blind watermarking" approach in the sense that the watermark can be extracted directly from the watermarked audio recording, the source audio is not needed for watermark detection and extraction. AWT2 provides industrial grade performance, features, robustness and data rate. Designed for anti-piracy, monitoring, tracing and forensic purposes over digital and analog audio channels.
Details, examples, FAQ and free demo
 

 AWT3     

Audio Watermarking Tools 3 (AWT3) — an audio trigger and watermarking solution especially designed for reliable far-field, over-the-air digital signaling in so called "second screen" applications and for other similar uses (kick-shopping and more). Details and demo, including Android app allowing to detect arbitrary watermarks over-the-air, are available upon request.
More information
 

 AWT4     

Audio Watermarking Tools 4 (AWT4) — an audio triggering, signaling and watermarking solution providing time-precise "digital stamping" with high data rate. Allows placing/extracting capacious digital codes in audio streams at precise time places to trigger time- and data-specific events with very high timing accuracy (~30ms).
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 AWT0     

Audio Watermarking Tools 0 ("AWT-Zero") — inaudible signaling over lossless audio PCM channels. Allows watermarking of extremely short wave files and triggering over completely lossless audio channels.
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Refer to a detailed comparison chart of AWT solutions below.

Applications and uses AWT1 AWT2 AWT3 AWT4 AWT0
Robust watermarking designed specifically for anti-piracy Yes Yes No No Yes
General purpose watermarking and digital signing suitable for authentication, anti-piracy, back-tracking and forensic purposes Yes Yes Partially Partially Yes
Data-hiding, data-transmission mean for general purposes Yes Yes Yes Yes Yes (via lossless PCM channel only)
Reliable over-the-air sound transmission/triggering (for second-screen uses) No No Yes Yes No
Live broadcast monitoring (easy/fast automated watermarks search) No Yes Yes Yes Yes (via lossless PCM channel only)
Events triggering by signaling via audio stream No Yes Yes Yes Yes (via lossless PCM channel only)
Algorithm characterization AWT1 AWT2 AWT3 AWT4 AWT0
Decoder needs source (not watermarked) audio to find/extract watermark Yes No No No No
Overal watermarks robustness Very high, insane Very high High High Minimal
Watermarks are inaudible Yes Yes Yes Almost Yes
Watermarks survive wave editing (cutting, cropping, padding) Yes Yes Yes Yes Yes
Watermarks survive time-stretching (playback speed variation) No Yes Partially Yes No
Watermarks survive tracks mixing Yes Partially Partially Partially No
Watermarks survive lossy transcoding (MP3, Youtube, etc.) Yes Yes Yes Yes No
Watermarks survive bandwidth limiting Yes, fully Yes, fully Typically not Yes, with proper settings N/A
         ... survive FM radio transmission Yes Yes Typically not Yes, with proper settings N/A
         ... survive transmission over telephone lines Yes Yes No Yes, with proper settings N/A
Watermarks reliably survive air-transducing (sound transmission over the air) Yes Partially (on short distances) Yes (even on long distances) Partially (with proper settings) No
Watermarks can be used for over-the-air triggering No No Yes (even on long distances) Partially (with proper settings) No
Very low-power watermark detection No No Yes No No
Watermarks are fully secret and cannot be detected by expert signal inspection Yes Yes No No Yes
Minimal watermarkable audio duration ~ 5 sec ~ 5 sec ~ 3 sec ~ 3 sec ~ 20 ms
Watermark payload length Up to 20 bytes* Up to 120 bytes* Up to 30 bytes* Up to 48 bytes* Up to 128 bytes*
Multi-layer watermarking capabilities (multiple independent watermarks in one stream) No Yes, dual-layer Partially Yes, multiple layers No
Time-accurate watermark placement and detection No ~8 sec precision ~150 ms precision ~30 ms precision Up to ~5 ms precision
Default/typical watermark carrier frequency region Low+mid range, fixed Low+mid range, fixed Ultra-sonic, configurable Fully configurable N/A (not frequency-based)
Types of AWT-watermarks that can co-exist in the same stream AWT3, AWT4 AWT3, AWT4 AWT1, AWT2, AWT4 AWT1, AWT2, AWT3 N/A
Encoding speed Very high Very high High Very high Very high
Watermarking domain Uncompressed Uncompressed Uncompressed Uncompressed Uncompressed
Software and Deliverables AWT1 AWT2 AWT3 AWT4 AWT0
Free evaluation package available Yes Yes Yes Yes Yes
Cross-platform software (Windows, Linux, Mac OS, mobiles) Yes Yes Yes Yes Yes
Command line (CLI) file-to-file tools for easy automation and scripting on servers Yes Yes Yes Yes Yes
User-friendly GUI for desktop OS Yes Yes No No No
SDK available No Yes Yes Yes Yes
SDK with real-time audio streams encoding capabilities No Yes Partial Yes Yes
Detailed documentation Yes Yes Yes Yes Yes
Android app available No Yes Yes No No

(*) subject to limitations in different packages