Abstract: A hearing aid with a microphone, a preamplifier connected behind it which is connected to a signal processing voltage-controlled circuit which is provided with a voltage-controlled filter, for example, which is connected to the output amplifier controlling an earpiece. In order to achieve the best possible adaptation it is provided that the signal processing voltage-controlled circuit is connected to a signal analysing circuit (MAC) controlling it, which is in connection on the input side with the preamplifier or output amplifier (30, 50) and is substantially formed by a Hilbert circuit (HS), the two outputs (A, F) of which supplying the momentary values of the frequency and the amplitudes of the input signal are connected to the inputs of corresponding Hilbert circuits via high-pass filters and the outputs of all three Hilbert circuits are in connection with the control inputs of a voltage-controlled signal processing circuit (40).

Abstract: Remote control device for controlling apparatuses to be carried on the body, in particular hearing aids, and being provided with a circuit responsive to control signals. In order to give the remote control device a particularly simple and reliable design, it is provided that the remote control device comprises a permanent magnet (3) which is separate from the device (2, 8) to be controlled, and that the apparatus (2, 8) comprises at least one sensor (3; 10A, 10B) sensitive to a magnetic field and acting on a control circuit (20) via a signal converter circuit (6, 7, 12, 14; 13, 15) if so required.

Abstract: A hearing aid with a microphone, with at least one amplifier fed with the signals from said microphone, whereby the amplifier cooperates with a filter of a higher order for influencing the frequency response, and with a loudspeaker which transforms the amplified signals into soundwaves. This filter (3) can be arranged in the conventional manner between two amplification stages or in the feedback loop of the amplifier (6). In order to allow the optimal adjustment of the frequency response to the respective requirements it is provided in this hearing aid that the filter (3) is arranged as a multiple filter with a biquadratic structure and comprises at least two integrators and an inverting amplifier, whereby the active elements of their components are formed by transistors, preferably single transistors (T1, T2, T3). The feedback loop of the amplifier (6) is guided through an adjustable potentiometer (R.sub.

Abstract: Hearing aid for persons with an impaired hearing faculty, including a directional microphone whose pick-up characteristic can be altered, the pick-up characteristic being automatically controlled as a function of the input or output signal in such a way that all possible microphone characteristics may be set, and this is realized in that the directional microphone (10) is an electret microphone and that the changes in the pick-up characteristic take place electrically and continuously.

Abstract: A hearing aid comprises a microphone, a battery-operated earphone, and amplifying circuit connected to the microphone output, the amplifying circuit including a frequency-selective circuit component and a sound level adjustment circuit component connected to the frequency-selective circuit component, and a remote sound wave control signal emitter circuit separate from the microphone, earphone and amplifying circuit and emitting sound wave control signals within the range of the microphone input.

Abstract: A hearing aid adapted to be worn in the ear, comprises a housing receiving a sound transducer and a sound amplifier, the housing being shaped to fit into the ear and having an upper rim, a mounting plate defining a space for holding a battery and a sound volume adjustment control, the mounting plate having a circumferentially extending outer rim, and detachable fastening means connecting the upper housing rim and the outer mounting plate rim.

Abstract: To provide a mass-producible hearing aid adapted to be inserted into the external passage of the vast majority of human ears while leaving the concha unencumbered and without requiring individual impressions, the invention proposes a hearing aid which comprises a housing, a coupling element connected to the housing in communication with the sound emission opening of the hearing aid, and a sealing plug detachably connected to the coupling element and having an end remote from the housing, the sealing plug being comprised of cylindrical inner part mounted on the coupling element and an outer part turned back from the inner part at the remote end.

Abstract: Plug for miniature receiver, especially for pocket hearing aids for the hard-of-hearing, with a plug body (7) and at least one plug pin (9) projecting out of the plug body (7). In order to avoid a gap between the receiver and the plugged-in plug, and therefore avoidance of escape of sound, it is suggested that the plug body (7) should be provided with a circumferential bulge (11, 14) of elastic material, surrounding the plug pin (or pins), which lies as a sealing ring on the receiver (1) when the plug is plugged in, thus acoustically sealing the gap between the receiver housing and the plugged-in plug.

Abstract: An artificial elbow joint comprises a detent wheel rotatably mounted on the forearm and fixedly connected to the upper arm, the detent wheel having a periphery defining a series of detent notches and a lug affixed thereto and projecting from the periphery. A latch is slidably mounted in relation to the detent wheel and a spring biases the latch against the detent wheel into a first position wherein the tip of the latch engages a respective detent notch to lock the joint. A cable line is attached to the latch and is operable to move it into a second position wherein the latch tip is disengaged and the joint is unlocked, operation of the cable line pivoting the forearm in relation to the upper arm. A leaf spring having an angularly bent end is displaceable between the notched detent wheel periphery and the latch by the lug to retain the latch in the second position.

Abstract: At least one comparator circuit and one timing circuit are provided so that the operation of a control element in response to the tensing of the muscles of a patient depends upon the time duration during which the patient tenses the muscle. Further timing and comparator circuits may be provided so that the rate at which the patient tenses the muscles can also influence the operation of the output control element. A reset circuit resets the timing and comparator circuits in response to alternate muscle tensings, allowing the patient free choice of any available operating condition independent of the previous operating condition.

Abstract: A movable limb rehabilitation device such as an orthosis or prosthesis part is connected to a drive by a transmission which converts rotary into linear reciprocatory motion. The transmission includes a cylinder coupled to the drive for rotation therewith and having two separate threads of opposite pitch, a sleeve and a spindle respectively threadedly mounted on the threads for linear movement in relation to the cylinder and non-rotatably held on the cylinder whereby rotation of the cylinder by the drive causes the linear movement of the sleeve and spindle, and a tackle with a cable or chain having two ends facing the drive, the ends being respectively affixed to the sleeve and spindle and the tackle being connected to the movable orthosis or prosthesis part for moving the same in response to the rotary motion of the drive.