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 · 2014
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.