Re: [LAU] Looking for Audio Watermarking Advice & Tools

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To: Al Thompson <althompson58@...>
Cc: <linux-audio-user@...>
Date: Tuesday, October 25, 2011 - 2:33 am

On Mon, Oct 24, 2011 at 10:00 PM, Al Thompson wrote:

Al, I have a huge amount of respect for your technical knowledge but
offhand remarks like this require some countering in an online forum.
Its true that low bit rate psycho-acoustic lossy compression does
remove some "good" information. But my impression is that at
"appropriate" bit rates, an overwhelming majority of humans cannot
differentiate between an mp3 and the original recorded audio. I'm not
entirely clear what "appropriate" means, but I believe that its hard
for most people to differentiate (in a double blind test) at 128kbps,
very hard at 192kbps and essentially impossible at rates above
256kbps. Should I update my understanding of this?

i'm relatively skeptical of any claims for audio steganography that
can survive arbitrary psycho-acoustic compression. in addition, random
permutations of the least significant bits of a PCM encoding will
almost certainly eliminate or at least reduce the confidence level
associated with the presence or absence of the watermark), in a way
that will be inaudible to more or less anyone.
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Messages in current thread:
[LAU] Looking for Audio Watermarking Advice &amp; Tools, Kevin Cosgrove, (Sun Oct 23, 3:13 pm)
Re: [LAU] Looking for Audio Watermarking Advice &amp; Tools, Thomas Vecchione, (Mon Oct 24, 11:35 am)
Re: [LAU] Looking for Audio Watermarking Advice &amp; Tools, Fons Adriaensen, (Sun Oct 23, 5:38 pm)
Re: [LAU] Looking for Audio Watermarking Advice &amp; Tools, Pedro Lopez-Cabanillas, (Mon Oct 24, 5:14 am)
Re: [LAU] Looking for Audio Watermarking Advice &amp; Tools, Fons Adriaensen, (Sun Oct 23, 9:42 pm)
Re: [LAU] Looking for Audio Watermarking Advice &amp; Tools, Fons Adriaensen, (Mon Oct 24, 9:34 pm)
Re: [LAU] Looking for Audio Watermarking Advice & Tools, Paul Davis, (Tue Oct 25, 2:33 am)
Re: [LAU] Looking for Audio Watermarking Advice &amp; Tools, Thomas Vecchione, (Wed Oct 26, 2:51 pm)
Re: [LAU] Looking for Audio Watermarking Advice &amp; Tools, Fons Adriaensen, (Tue Oct 25, 10:47 am)
Re: [LAU] Looking for Audio Watermarking Advice &amp; Tools, Monty Montgomery, (Thu Oct 27, 11:40 am)
Re: [LAU] Looking for Audio Watermarking Advice &amp; Tools, Fons Adriaensen, (Thu Oct 27, 3:41 pm)
Re: [LAU] Looking for Audio Watermarking Advice &amp; Tools, Monty Montgomery, (Thu Oct 27, 3:47 pm)
Re: [LAU] Looking for Audio Watermarking Advice &amp; Tools, Fons Adriaensen, (Thu Oct 27, 4:04 pm)
Re: [LAU] Looking for Audio Watermarking Advice &amp; Tools, Monty Montgomery, (Thu Oct 27, 4:06 pm)
Re: [LAU] Looking for Audio Watermarking Advice &amp; Tools, Florian Paul Schmidt, (Tue Oct 25, 8:20 am)
Re: [LAU] Looking for Audio Watermarking Advice &amp; Tools, Fons Adriaensen, (Mon Oct 24, 9:11 am)
Re: [LAU] Looking for Audio Watermarking Advice &amp; Tools, Gabriel M. Beddingfield, (Sun Oct 23, 9:50 pm)
Re: [LAU] Looking for Audio Watermarking Advice &amp; Tools, Gabriel M. Beddingfield, (Thu Oct 27, 3:14 am)
Re: [LAU] Looking for Audio Watermarking Advice &amp; Tools, Gabriel M. Beddingfield, (Sun Oct 23, 11:41 pm)
Re: [LAU] Looking for Audio Watermarking Advice &amp; Tools, Fons Adriaensen, (Sun Oct 23, 10:41 pm)
Re: [LAU] Looking for Audio Watermarking Advice &amp; Tools, Kevin Cosgrove, (Sun Oct 23, 10:07 pm)