Abstract: A single-channel nerve stimulating device for auditory prosthesis for improving the conversational capacity of a profoundly deaf person is described. The single-channel device of simple construction provides detailed information to the patient's nervous system. The device comprises a microphone designed to pick up a sound signal and electronic processor which converts the sound signal into an electrical signal.

Abstract: An equipment is described using n electrode sets implanted in the cochlea at n different locations for allowing the brain to identify n different frequencies. A receiver implant is coupled to the electrode sets through a selector and an external emitter is coupled to a single receiver coil of the implant by means of a single emitter coil. In the emitter the sound information signal is processed for forming n analysis signals of which the frequencies correspond to said n different frequencies and raster signals which are transmitted by modulating a high frequency a.c. signal. Each raster signal comprises at least n pulses of which the durations correspond to the energies to be transmitted to the n electrodes.