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Doubletalk detection is commonly used in acoustic echo cancellation units. In situations of doubletalk the adaptive filter in the acoustic echo canceler might diverge, thereof the need for doubletalk detection. In this paper, an open-loop doubletalk detector based on power spectrum estimation is presented. The detector explores the signal characteristic of speech signals to define a frequency distance measure. The present signals are evaluated by this distance measure, and the measure isdoi:10.2514/5.9781600865664.0331.0362 fatcat:pr44ygqh5vec7omrhywiiw2mea