1. A system for controlling an electronic device through voice control commands, the system comprising: a hierarchical arrangement of a first spiking neural network and a second spiking neural network, said first spiking neural network receives output spikes from an artificial cochlea, said first spiking neural network configured to recognize and learn spike patterns, in the output spikes, that indicates presence of a voice activity in the output spikes, and said first spiking neural network activates said second spiking neural network from a low energy halted or off state, if any voice activity is detected, in the output spikes, by said first spiking neural network.