Abstract: The hearing aid with a faceplate is charactrized in that the axle for the mounting of a part which can be pivoted outwards consists of an electrically conductive material and serves as connection between mentioned part and the electronics of the apparatus.

Abstract: A hearing aid has a skeleton, with an outer support element (3), an inner support element (4) and a connecting element (5), on which are arranged at least part of the electronic components (41, 42) of the hearing aid. The two support elements essentially form the end faces (IS, AS) of an irregular frustum. To the support elements is fixed a diaphragm (2) in such a way that it essentially forms the circumferential surface of the frustum. The diaphragm (2) and the skeleton (3, 4, 5) together form a substantially tubular molding cavity, in which a shaped member (1) adapted to the individual auditory canal is molded with a hardening molding compound in the ear of the user. Prior to the molding process the skeleton can be roughly adapted to the individual auditory canal by a suitable deformation of the connecting element (5). The diaphragm (2) is not only gas-permeable and liquid-impermeable at right angles to its main surface.

Abstract: The programming contacts of a programmable hearing aid are selectively used as audio input. To this end an electronic switch is provided which is controlled by the memory block. By transmitting special data signals to the memory block the switch is switched on or off, respectively.

Abstract: An analog-digital processing unit including an amplifier with amplification that is adjustable in stages, and a quantizer outlet connected downstream of the amplifier. The output of the quantizer acts as actual value to control the amplification of the amplifier. With the assistance of the instantaneous value output from the quantizer, and the instantaneous prevailing amplification, the signal values, compensated by the instantaneous amplification, are defined and are output in a memory and scaling unit.

Abstract: In a hearing aid having a switched amplifier, an amplifier circuit is provided so that the pulse amplitude of the switched output signal is adjusted as a function of the envelope of the audio signal to be amplified. A controllable amplifier is switched in series ahead of the switched amplifier, whereby its control by the audio signal to be amplified proceeds in such a manner that the product of the amplifications of the two amplifiers remains constant for all audio signal levels.

Abstract: For hearing aids to be worn in the ear initially the measurements of the inner space of the ear are determined by a laser apparatus and the measurement are stored in a computer. The computer controls a milling cutter on which a blank consisting of plastic material into which all necessary components, such as electronic amplifier and sound transducer have been molded is shaped by means of a milling operation to provide a shape corresponding precisely to the inner space of the ear. The method eliminates the time consuming work for the production of a mold and the purchaser can obtain immediately a precisely fitting hearing aid.