US 2006/0052887 A1 · Audio electronic watermarking device

Abstract

The present invention relates to an audio digital watermark apparatus in which noise is not generated by embedding watermark data, which is resistant to modification caused by irreversible compression, into audio data, the embedding process of watermark data is reversible, and detection of watermark data is easy. The sound which is inaudible low-frequency is used as the data for generating a watermark and said data is multiplexed with the original audio data, so that it becomes possible to control and code the value of a predetermined summation of the multiplexed audio data. In detecting a watermark data, 0 or 1 of the watermark data is judged from the result of a predetermined summation per predetermined cycle of the multiplexed audio data with a watermark.

Claims18

Dependent claims

An audio digital watermark apparatus for recording watermark data on a voice-recording medium, which comprises:

an audio data acquisition unit, which acquires audio data;
a watermark data acquisition unit, which acquires watermark data;
a data generation unit for generating data for a watermark, which generates data for generating a watermark by multiplexing the audio data acquired by said audio data acquisition unit and the data for generating a watermark generated by said data generation unit for generating data for a watermark, wherein the result of a predetermined summation of multiplexed audio data per predetermined cycle represents the watermark data acquired by said watermark data acquisition unit;
and
a multiplexed audio data generation unit, which generates multiplexed audio data by multiplexing the audio data acquired by said audio data acquisition unit and the data for generating a watermark generated by said data generation unit for generating data for a watermark.

2 more elements

An audio digital watermark recording method for recording watermark data on a voice recording medium, which comprises:

an audio data acquisition step of acquiring audio data;
a watermark data acquisition step of acquiring watermark data;
a data generation step for generating data for a watermark, which generates data for a watermark by multiplexing the audio data acquired by said audio data acquisition step and the data for generating a watermark generated by said data generation step for generating data for a watermark, wherein a result of a predetermined summation of multiplexed audio data per predetermined cycle represents the watermark data acquired by said watermark data acquisition step;
and
a multiplexed audio data generation step, which generates multiplexed audio data by multiplexing the audio data acquired by said audio data acquisition step and the data for generating a watermark generated by said data generation step for generating data for a watermark.

2 more elements

Dependencies are inferred from the claim text.

Audio electronic watermarking device

Life of this patent

Audio electronic watermarking device

Life of this patent

Abstract

Claims18