4. Data processing: speech signal processing, linguistics, language
  5. Audio signal bandwidth compression or expansion
  6. Delay line

Daniel Gruhl

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Method and apparatus for data hiding in images

Image analysis – Image compression or coding
Patent

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Method and apparatus for data hiding in images

Image analysis – Image compression or coding
Patent

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Method and apparatus for data hiding in printed images

Facsimile and static presentation processing – Static presentation processing – Data corruption – power interruption – or print prevention
Reexamination Certificate

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Method and apparatus for echo data hiding in audio signals

Data processing: speech signal processing – linguistics – language – Audio signal bandwidth compression or expansion – Delay line
Patent

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Method and apparatus for logo hiding in images

Image analysis – Applications
Reexamination Certificate

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