The invention discloses echo cancellation two-way voice talk back equipment which comprises an audio input module, a horn drive module, an echo
elimination module, a
noise-reducing and silencing module, a voice
delay module and an audio output module. The echo cancellation two-way voice talk back equipment has the beneficial effects that the echo
elimination module ensures bidirectional voice call at a distance of furthest 3m and eliminates echo and squeal; input audio control is completed through an
automatic gain control algorithm of the echo
elimination module, conditions of no remarkable fluctuation, small voice volume difference, no
distortion and the like do not exist in sound in a distance of 1-3m; the
noise is reduced by 10Db through the
noise-reducing and silencing module, and a
time domain and a
frequency domain noise analyzing modules, environment noise is eliminated, and echo noise is further reduced; and voice is delayed through a voice
delay module, sound of amplified by a speaker is avoided being overlapped with sound acquired by a
microphone to cause incapability of accurately confirming an
echo signal.