Compared with the existing speech recognition, the one based on the spiking neural network has higher robustness, lower cost, lower power consumption, and more biological basis. SNN highly depends on spiking signals as input, so an audio coding method for SNN is necessary. The audio coding circuit in this paper is based on the principle of the human cochlea and is completely constructed by analog signals. It enables audio coding to achieve faster response speed and higher robustness. After the audio signal is input into the circuit, the channels of different frequencies have spiking signal output.

Audio signal coding;sound sensor;spiking neural network;speech recognition;human cochlea