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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(More)
This paper presents an improved method for asynchronous embedding and recovery of sub-audible watermarks in speech signals. The watermark, a sequence of DTMF tones, was added to speech without knowledge of its time-varying characteristics. Watermark recovery began by implementing a synchronized zero-phase inverse filtering operation to decorrelate the(More)
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