Audio watermarking
The copying of digital files has become a very easy task. Almost all media can be, and is represented digitally and distributed across the world in a matter of a few mouse clicks. A novel audio watermarking scheme is presented to inaudibly encode an owner's signature into an audio file in WA...
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| Main Authors: | , |
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| Other Authors: | |
| Format: | Final Year Project |
| Language: | English |
| Published: |
2015
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| Subjects: | |
| Online Access: | http://hdl.handle.net/10356/65294 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | The copying of digital files has become a very easy task. Almost all media can be,
and is represented digitally and distributed across the world in a matter of a few
mouse clicks. A novel audio watermarking scheme is presented to inaudibly encode
an owner's signature into an audio file in WAY format. This non-blind watermarking
algorithm is based on both time and frequency base modulation. Segments of the file
are compressed or expanded by adding or removing samples in the frequency
domain. The amplitude of these samples is below the threshold limits calculated with
Psychoacoustic Model I. This is manifested in the time domain as the lengthening
and shortening of segments of the audio signal. Information is represented by this
pattern of expansion and compression. The proposed method achieves a balance
between the aural imperceptibility of the introduced distortion and the robustness of
the watermark. Results show successful recovery of the signature which allows
conclusive authentication of the owner even after attacks like filtering, cropping,
MPEG compression, resampling and the addition of noise. |
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