Braun Aktiengesellschaft

Harry Gaus

Dietwald Schotte

Udo Milutziki

Jeffrey Johnson

Klaus Ramspeck

Udo Milutzki

A loudspeaker enclosure for use in housing loudspeakers, the loudspeaker enclosure comprising a casement having a generally rectangular cuboid shape, the casement including three layers. A first layer and a second layer comprise sheets of metal and are space apart to provide for an inner layer of plastic material. In one embodiment of the invention, the casement is formed by bending a sheet of material including the three aforementioned layers to conform to a generally rectangular cuboid shape. In another embodiment of the invention, the first layer of metal is bent to a rectangular cuboid shape defining four interior surfaces. A flat layer of plastic and a flat layer of metal is applied to each interior surface of the casement. The casement provides a wall having a relatively high density, a high modulus of elasticity and a high damping factor.

Loudspeaker enclosure

A control mechanism for raising, swinging and lowering the pick-up arm of a record player comprising a disc having an arcuately shaped depression in the periphery thereof. The contacts of an electrical contact sensor switch are located in the disc peripheral depression and bridging of these contacts will cause generation of a first command signal for the control mechanism. Devices for generating second and possibly third command signals are associated with the disc which may be rotatably mounted.

Control mechanisms for pick-up arms of record players

When the user presses a touch-activated switch a first time, a first digital storage device becomes set and furnishes a platter-motor-start signal to the control electronics of the platter drive motor. If the touch-activated switch is pressed a second time, the first digital storage device becomes reset, and the signal commanding that the platter drive motor operate terminates. A second digital storage device likewise assumes its set and reset states in response to the first and second pressing of the touch-activated switch. Sensors ascertain various operating conditions during the course of turntable operation, such as the swinging of the tone arm to the position corresponding to the lead-in groove of a phonograph record. The states of the digital storage devices are additionally dependent upon the conditions sensed by the sensors. Logic circuitry interprets the combinations of states of the digital storage devices and causes the requisite turntable operations to be performed, e.g., lifting and lowering of the tone arm, inward and outward swinging of the tone arm, initiation and termination of rotation of the platter, audio muting, and the like.

Phonograph turntable control system

When a touch-activated switch unit is touched a first time, a platter-motor flip-flop arrangement assumes its motor-operate state, and when the switch unit is touched a second time, the flip-flop assumes its motor-not-operate state. A tone-arm swing-in flip-flop assumes its swing-in state when the platter-motor flip-flop assumes its motor-operate state. A tone-arm swing-out flip-flop assumes its swing-out state when the platter-motor flip-flop assumes its motor-not-operate state. A signal-transmission switch closes the transmission path between the swing-in and swing-out flip-flops and the electrical drive of the tone-arm swing mechanism, but only when the tone-arm lift mechanism has lifted the tone arm to raised position. A touch-activated lift-tone-arm switch is operated when touched for generating a lift-tone-arm command signal. An OR-gate has an output connected to the tone-arm lift mechanism for activating the latter in response to the lift-tone-arm command signal, in response to assumption of the swing-in state by the swing-in flip-flop, and in response to assumption of the swing-out state by the swing-out flip-flop.

A loudspeaker driver system linearizes loudspeaker operation by superimposing a high frequency (supersonic) signal on the low frequency (audio) signal. Features include a special crossover network for a multispeaker system, and an acoustic filter formed of perforated discs.

Growing community of inventors

Kronberg, Germany

Harry Gaus