5th European Conference on Speech Communication and Technology

Rhodes, Greece
September 22-25, 1997

Data Hiding in Speech Using Phase Coding

Yasemin Yardimci (1), A. Enis Cetin (1), Rashid Ansari (2)

(1) Department of Electrical and Electronic Engineering; Bilkent University; Ankara, Turkey (2) Department of Electrical Engineering and Computer Science University of Illinois, Chicago, Illinois; USA

The human auditory system is insensitive to phase information of the speech signal. By taking advantage of this fact data such as the transcript, some keywords, and copyright information can be embedded into the speech signal by altering the phase in a predefined manner. In this paper, an all-pass filtering based data embedding scheme is developed for speech signals. Since all-pass filters modify only the phase without effecting the magnitude response they are employed to diffuse data into the speech signal by filtering different portions of the speech signal with different all-pass filters. The embedded data can be retrieved by tracking the zeros of the all-pass filters.

Full Paper

Bibliographic reference.  Yardimci, Yasemin / Cetin, A. Enis / Ansari, Rashid (1997): "Data hiding in speech using phase coding", In EUROSPEECH-1997, 1679-1682.