Go To Program 57 Fixed-point Implementation of a Coherence-based Double-talk Detector for Line Echo Cancelers Radu Pralea 1 1 Packet Telephony Applications, Freescale Semiconductor Romania, Bucharest, Romania In this paper we justify the need and describe the implementation of a spectral coherence based double-talk detector for line echo cancelers on a 16 bit signal processor. We address specific fixed-point implementation issues  and we illustrate the superiority of the solution over the energy/level based Geigel detector, along with a discussion about the use cases. View pdf