In this paper we describe an application of spread spectrum techniques in audio data hiding for watermarking and steganography. The method is self-synchronizing, cover dependent, and operates in the time domain. We use a special class of frequency-hop signal know as a Welch-Costas Array. Welch-Costas Arrays have the properties of range and Doppler resolution. This allows us to recover embedded data with a matched filter. We also demonstrate a special case of an adaptive method due to Su and Girod [1].
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