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The Use of Highpass Filtered Time-Spread Echo for Pitch Scaling Detection
Hwai-Tsu HU Hsien-Hsin CHOU Ling-Yuan HSU
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2014/07/01
Online ISSN: 1745-1337
Type of Manuscript: LETTER
Category: Cryptography and Information Security
pitch scaling, time-spread echo, audio watermarking,
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An echo-hiding scheme is presented to detect the pitch variation due to playback speed modification. The inserted time-spread echo is obtained by convolving the highpass filtered audio with a gain-controlled pseudo noise sequence. The perceptual evaluation confirms that the embedded echo is virtually imperceptible. Compared with the Fourier magnitude modulation, the proposed scheme attains better detection rates.