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An extensive though scattered literature exists on the estimation of time delays in signal processing applications. However, it is possible to identify themes that are common to many of the available techniques. The intention of this paper is to provide a framework against which the literature may be viewed. In addition, original work on gradient based time delay estimation is described.
O'Dwyer, Aidan : Time delay estimation in signal processing applications: an overview. IT & T Conference, Waterford Institute of Technology, October, 2002.