Inserting watermarks into audio signals that have speech-like properties

摘要

A method for a machine or group of machines to watermark an audio signal includes receiving an audio signal and a watermark signal including multiple symbols, and inserting at least some of the multiple symbols in multiple spectral channels of the audio signal, each spectral channel corresponding to a different frequency range. Optimization of the design incorporates minimizing the human auditory system perceiving the watermark channels by taking into account perceptual time-frequency masking, pattern detection of watermarking messages, the statistics of worst case program content such as speech, and speech-like programs.

主权项

1. A method for a machine or group of machines to watermark an audio signal, the method comprising:
receiving an audio signal; receiving watermark data payload information; converting the watermark data payload information into a watermark audio signal including one or more watermark messages corresponding to the watermark data payload information, each of the one or more watermark messages comprising multiple bits, each bit represented by a respective symbol of predetermined multiple symbols, each of the multiple symbols corresponding to a respective audio segment; and inserting the one or more watermark messages into multiple spectral channels of the audio signal one symbol, of the multiple symbols, per spectral channel, of the multiple spectral channels, at a time, wherein each of the multiple spectral channels occupies a different frequency range and wherein each of the multiple symbols has a time duration that ranges from 20 milliseconds to 50 milliseconds.