Class 381/320 - Spectral control

Subclass of Class 381 - Electrical audio signal processing systems and devices
Definition: Subject matter including a circuit to control the amplitude
No. of patents: 204
Last issue date: 04/03/2012

Number	Title	Issue Date
4051331	Speech coding hearing aid system utilizing formant frequency transformation A hearing aid system and method includes apparatus for receiving a spoken speech signal, apparatus coupled to the receiving apparatus for determining at successive intervals in the speech signal the frequency and amplitude of the largest formants, apparat...	09/27/1977
4025723	Real time amplitude control of electrical waves This invention relates to real time control either in compression or expansion of the amplitude of electrical waves and more specifically to a real time expandor or compressor of the amplitude of sound waves. In general a source of waves which may be the ...	05/24/1977
4025732	Method and device for presenting information to deaf persons In a device for presenting information to deaf persons an electroacoustic signal from a microphone is supplied to a high-pass and to a low-pass channel via an amplifier. The relation between the envelope potentials of the high-passed and the low-passed si...	05/24/1977
3989904	Method and apparatus for setting an aural prosthesis to provide specific auditory deficiency corrections Apparatus for setting or adjusting an aural prosthesis, such as a hearing aid, in order to provide compensatory amplification or attenuation for aurally handicapped persons such that the prosthesis compensates for the specific auditory deficiencies of tha...	11/02/1976

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