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Watermark-Aided Pre-Echo Reduction in Low Bit-Rate Audio Coding

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Low bit-rate coding/decoding with standard AAC and MP3 coders smoothes attacks in transient signals and increases the pre-echo. A system is proposed for reducing pre-echo artifacts by embedding temporal envelope correction as watermarking data, which eliminates the need for an auxiliary communications channel. The restored signal is reconstructed at the receiver from two components: the decoded signal generated by the core decoder, and the temporal envelope of the original signal, which is represented by a few parameters that are transmitted as embedded data in the audio signal.

JAES Volume 60 Issue 6 pp. 431-443; June 2012
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Arijit Biswas

Comment posted August 15, 2012 @ 17:38:59 UTC (Comment permalink)

Very interesting paper and it was very nice to read.

However, I’ve got one question/comment:
Authors mention that “ARMA model is used to estimate the temporal envelope”.

I agree with the authors that ARMA model is efficient, but how does the authors guarantee stability of the ARMA model? I’m concerned because ARMA modeling using Prony’s Method is not guaranteed to be stable. See this link:
In case you have some references or used some techniques to guarantee the stability of the ARMA modeling using Prony (or any other method), I would be very interested to know.

Best Regards,

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