Method and apparatus for generating electrocutaneous stimulation patterns for the transmission of acoustic information

US4390756A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Christian Hoffmann · Leonberg, DE
• Manfred Zollner · Munich, DE
• Eberhard Zwicker · Icking, DE

Key dates

• Filing date: Jan 6, 1981
• Grant date: Jun 28, 1983
• Expiry date: Jan 6, 2001

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61F11/04
• WIPO field: Control
• WIPO sector: Instruments

Abstract

In an exemplary embodiment, the point of departure is that of a substitute signal system for deaf individuals which codes acoustical signals, in particular speech sound, into electrocutaneous stimulation patterns. Current pulse patterns serve as substitute signals which, via skin surface electrodes, e.g. on the forearm, bring about sensory patterns which can be interpreted as speech information. To this end, the sound signal is separated with band pass filters into e.g. twelve component signals characteristic for the recognition of speech, whose levels are converted into pulse durations, whereby the dependency of the sensation intensity upon the stimulation parameters is taken into account. The mean frequencies of the band pass filters are associated with a corresponding number of locations on the forearm (i.e. in the present example twelve). A simulation of lateral inhibition suppresses irrelevant spectral components and thus acts in a selectivity-increasing (or enhancing) fashion. It is thereby possible that, after only approximately fifteen hours of practice, ten monosyllabic words are correctly recognized with a reliability of approximately 95% by means of the sensor patterns w…