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Table 3 The measures of detection quality.

From: Time-Frequency-Based Speech Regions Characterization and Eigenvalue Decomposition Applied to Speech Watermarking

Attack

R

No attack

4.3

Mp3 constant

4.1

Mp3 variable

3.9

Delay

4

Echo

4

Pitch scaling

3.9

Wow

1.8

Bright flutter

3.8

Amplitude normalization

4.1