Recovering Asynchronous Watermark Tones from Speech

Abstract

A new, low complexity method facilitates low burden embedding and recovery of tonal watermarks in speech. A watermark composed of a periodically extended sequence of sub-audible DTMF tones is added to speech asynchronously, without regard to momentary speech characteristics. It is detected through a combination of a bit manipulation enhancement and a data-directed correlation, ideal for simple hardware implementations. Three methods of bit manipulation enhancement were auditioned and the best selected for further investigation. It showed an average 26 dB processing gain vs. correlation alone, sufficient to detect the asynchronous sub-audible tones by a comfortable margin.

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Document Details

Document Type
Technical Report
Publication Date
Apr 01, 2009
Accession Number
ADA550897

Entities

People

  • Joseph Divita
  • Ralph Johnson
  • Robert Morris
  • Vladimir Goncharoff

Organizations

  • Naval Information Warfare Systems Command

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Abstracts
  • Amplitude
  • Autocorrelation
  • Buildings And Structures
  • Coding
  • Correlation Analysis
  • Cross Correlation
  • Data Science
  • Decoding
  • Detection
  • Information Science
  • Power Levels
  • Recovery
  • Sequences
  • Signal Processing
  • Speech
  • Waveforms

Readers

  • Applied Combinatorial Optimization and Logic Circuit Design.
  • Forest Ecology
  • Speech Processing/Speech Recognition.