Robert Boschgmbh

Josef Taffner

Josef Plager

Gregor Sauer

Martin Maier

Thomas Schlittmeier

Alfred Brunhofer

Christian Glueck

Peter Hallstein

The invention relates to an audio amplifier () for amplifying an input signal into an output signal, comprising an output amplification stage (), wherein the output amplification stage () for the amplification of an intermediate signal into the output signal is designed as an amplifier operating in switching operation, and further comprising a limiter device (), which from a programming and/or a circuit design point of view is designed to generate the intermediate signal on the basis of the input signal, wherein the level of the intermediate signal is always limited by a maximum load as a function of a settable maximum output and a load impedance which is coupled and/or can be coupled the audio amplifier or equivalent parameter thresholds such that the output signal does not exceed the maximum load at the load impedance, or the equivalent parameter thresholds, independently of the input signal.

Audio amplifier having load adjustment and method for the load adjustment of the audio amplifier

The invention relates to a cover () for a portable electronic mixer amplifier (), said cover () comprising at least: a cover shell () having a front side () and a rear side for being mounted on a lower device part () of the mixer amplifier (), closure devices () for locking the cover () to the lower device part (), wherein the closure devices () can be adjusted between an open and a locked position. According to the invention, the cover () comprises a carrying device () which allows a user to carry the device, and closure recesses () are designed in the cover shell () in which the closure devices () are accommodated. The closure recesses, in particular actuatable closure parts (), are preferably aligned in the locked position with the front side () of the cover shell and protrude when in the open position.

Cover for a portable mixer amplifier

Audio amplifiers are used in many known forms in music systems, for example for domestic use or for playing music in cinemas, discos etc., but also in public address systems, as are known, for example, in public buildings, schools, universities etc. for making announcements. The invention proposes an audio amplifier () for amplifying an input signal into an output signal using an output amplifier stage (), wherein the output amplifier stage () is designed to amplify an intermediate signal into the output signal, and wherein the output amplifier stage () is in the form of an amplifier which operates in switching mode, and having a limiter device () which is designed, from a program and/or circuit point of view, to generate the intermediate signal on the basis of the input signal, wherein the level of the intermediate signal is always limited as a function of an adjustable maximum level in such a way that the output signal does not exceed the maximum level independently of the input signal.

Audio amplifier and method for recognition an audio amplifier

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Donaustauf, Germany

Josef Taffner