AudioWatermarking.info blog

New product – AWT1

Alex Radzishevsky — Mon, 23 Apr 2012 20:49:20 +0000

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 ways. While AWT1 requires the source audio file to decode watermark from the watermarked recording, AWT2 does not need the source. As a result, AWT1 watermarks are somewhat more robust to destructive audio transformations and the encoding speed is very high, while AWT2 is of course more practical, resistant to time-stretching, allows automated decoding (since non-watermarked sources are not needed) and provides higher watermarking data rate.

Check them out.
Details on AWT2
Details on AWT1

AWT2 0.08.20 has been released

Alex Radzishevsky — Wed, 04 Apr 2012 13:41:52 +0000

AWT2 0.08.20 has been released, which is a major release of the software. It brings several significant improvements. Here is a full change log:

encoder:
- significantly improved encoding speed (2 times faster in ‘normal capacity’ mode @ 44.1 KHz)
- lower RAM consumption
- reduced cache file size
- significantly smaller binaries
decoder:
- significantly improved watermark search speed (from 3 to 5 times faster); files with no watermarks are now detected quickly.
- improved watermark detection accuracy (including “-fast_calcs” mode which is now safe to use in almost all cases)
- lower RAM consumption
- new command-line parameters: “-stop_on_found” (stop watermark search after first watermark found), “-allow_not_reliable” allow watermarks with very low reliability
- significantly smaller binaries

AWT2 became patented technology

Alex Radzishevsky — Mon, 20 Feb 2012 01:40:22 +0000

The author of AWT2 has been granted a U.S. Patent No. 8,116,514 for the watermarking technology behind this product.

AWT2 0.08.15 has been released

Alex Radzishevsky — Mon, 20 Feb 2012 01:32:26 +0000

New AWT2 0.08.15 brings improved SDK and some internal code clean up.

New form of AWT2 encoder

Alex Radzishevsky — Sun, 27 Nov 2011 11:41:39 +0000

AWT2 encoder is now available in a form of client-server application, upon request. Client’s encoder performs all the heavy DSP as usual, but it requires receiving a special “key” for each unique watermark payload from the server side. This feature … Continue reading →

AWT2 0.08.13 has been released

Alex Radzishevsky — Tue, 01 Nov 2011 19:15:32 +0000

The new version fixes a bug in encoder which could cause sudden crash.

AWT2 0.08.12 has been released

Alex Radzishevsky — Wed, 10 Aug 2011 19:02:22 +0000

The new version brings improved handling of non-standard wave files. In particular, waves created in Pro Tools with non-standard chunks in the RIFF header are now accepted by AWT2.

AWT2 0.08.11 has been released

Alex Radzishevsky — Fri, 15 Jul 2011 18:40:09 +0000

AWT2 version 0.08.11 brings new features and improvements.

- added -fast_tempo_only and -slow_tempo_only parameters allowing to speed up synchronization stage of watermark decoding process by limiting time-stretched audio analysis to analysis of increased/decreased audio playback speed only
- added -fast_calcs parameter forcing the decoder to perform simpler and thus faster calculations at expense of some very moderate loss of reliability
- in AWT2 SDK – added in-memory watermark encoding/decoding functions
- fixed a bug that could cause crash in decoder
- fixed memory leakage in decoder

AWT2 0.08.10 has been published

Alex Radzishevsky — Tue, 17 May 2011 05:54:26 +0000

New AWT2 release offers new -slice_length & -slice_step feature that allows analyzing (decoding) long audio recordings by slices. It is especially useful for watermarks search in recordings of broadcasts in which not the whole recording is watermarked, but only parts of it (e.g. particular songs in radio broadcast). AWT2 User Guide contains detailed explanation of the feature and provides examples.

AWT2 0.08.9 has been published

Alex Radzishevsky — Thu, 28 Apr 2011 21:34:03 +0000

AWT2 version 0.08.9 brings full support of multichannel wave files (3, 4, 5, …, 12 channels are no problem now).

Additionally, several unpleasant bugs were fixed in GUI tool for Windows, Linux and Mac OS as well as in command line tools. In particular, the tools were not able to operate with file paths containing spaces. Now it should be OK under any OS.

FFmpeg static binary has been added into Mac OS package for more convenience.