Author Archives: Alex Radzishevsky

AudioWatermarking.info announces release of AWT4 – an audio triggering, signalling and watermarking solution providing time-precise “digital stamping” with high data rate. The technology allows placing/extracting capacious digital codes in audio streams at precise time places to trigger time- and data-specific events with high timing accuracy (~30ms).

Product page.

 … >>> Click to read the full post...

AWT2 0.10.03 is a major technology upgrade. AWT2 now natively supports Dual-Layer watermarking. Two independent watermarks can be embedded into the same audio stream at different stages of audio content distribution. Dual-layer watermarking is available in both AWT2 CLI tools and AWT2 SDK.

Full AWT2 changes log.… >>> Click to read the full post...

I published an open paper that describes a little crazy (but seems to be novel) idea of combining digital sound and QR codes together. The paper briefly describes a new approach that brings quite effective and easy data hiding and watermarking technique to general public through the use of QR codes (or similar bar-codes).

Read the paper: Alex Radzishevsky, Visual Domain Audio Watermarking (VDAW) and Spectral Barcode Audio Watermarking (SBAW), February 2014.… >>> Click to read the full post...

New AWT2 SDK (0.10.00) is a complete rework of the core encoding engine. It now supports real-time live audio streams encoding with low latency.

– Fully rewritten encoder code, backwards/forwards compatible with older decoders
– faster encoding, dramatically reduced encoder memory consumption
– completely new cross-platform SDK with real-time, low latency live audio stream encoding functionality
– fully thread safe SDK
– improved signal limiter with configurable attack/release times

The new SDK is available now.… >>> Click to read the full post...

New in AWT2 0.09.04 version:

– bugfix in the encoder: noise generation feature (“-noise_level” command line parameter) was ignoring “-skip_first” and “-skip_last” settings; fixed.
– improvement in the encoder: “-skip_last” value can be negative, in this case the parameter specifies duration of audio to be watermarked (all the rest is skipped and not watermarked)

Full changes log is available here.

AWT2 free evaluation package is available here.… >>> Click to read the full post...

The new AWT2 0.09.00 is a major AWT2 release. Here is what’s new:

– AWT2 encoder uses new, redesigned encoding algorithm (backward compatible with the older one). The new algorithm features new “-modulation_gain” parameter that triggers an additional modulation mechanism of the encoder aimed to increase watermark robustness. With default setting (0 dB) the modulation of the signal is not performed. Lower values (e.g. -6 dB) enable special modulation of sub-band signals that helps the watermarks to withstand audio transformations … >>> Click to read the full post...

Updated AWT1 package with critical fix in GUI.
What’s new:

• introduced “-no_limiter” command line switch in the encoder, allowing to force normalizing the output audio instead of limiting it
• fixed critical bug in the GUI front-end: “-auto_answer=a” switch was not specified in the decoding command line, as a result, proper decoding of cropped signals was not possible

 … >>> Click to read the full post...

Audio Watermarking Tools 1 (AWT1) is another product that is now offered at AudioWatermarking.info. AWT1 is a watermarking 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. In other words, watermark extraction is performed by “comparing” source and watermarked streams.

Both AWT1 and AWT2 are based on the same very basic patented approach, but use it in two different … >>> Click to read the full post...