Method for watermarking robust audios with invariable time scale based on zero-crossing rate
A technology of time scale and audio watermarking, which is applied in voice analysis, instrumentation, recording signal processing, etc., can solve problems such as weak robustness and performance dependence, and achieve the effect of ensuring robustness
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[0027] The content of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0028] 1. Watermark embedding: such as figure 1 process to embed the watermark.
[0029] (1) Divide the original audio signal A={a(i)|1≤i≤L} into N frames, expressed as A j |j=1, K, N, the original audio signal such as image 3 shown.
[0030] (2) Calculate the zero-crossing rate of each audio frame, expressed as Z j |j=1, K, N.
[0031] (3) Select M with the largest zero-crossing rate 1Audio frames are used to embed watermarks, denote this M 1 The smallest zero-crossing rate in an audio frame is ZCR 1 , the remaining N-M 1 The maximum zero-crossing rate in an audio frame is ZCR 2 , should satisfy the condition that ZCR 1 -ZCR 2 ≥T. Among them, T is the preset threshold, here T=0.05, M 1 =3.
[0032] (4) to M 1 One frame PA in audio frames 1 Embed watermark. PA 1 divided into N 1 Non-overlapping audio segments, denoted as PA ...
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