1. A neuromorphic system for controlling an electronic device through voice control commands, the system comprising: a spiking neuron adaptive processor comprising a hierarchical arrangement of a first spiking neural network and a second spiking neural network, wherein the first spiking neural network is configured to: receive output spikes from an artificial cochlea, wherein the artificial cochlea is configured to produce the output spikes based on a pulse code modulation signal, wherein one or more decimation filters convert a pulse density modulation signal into the pulse code modulation signal, and wherein one or more microphones convert a voice signal into the pulse density modulation signal; perform a cognitive and learning function that detects spike patterns in the output spikes, wherein the spike patterns indicate a presence of a voice activity in the output spikes; and activate the second spiking neural network through a digital interface from a low energy halted or off state based on the presence of the voice activity in the output spikes.