Abstract: The invention relates to a method for protecting a component (6) within an audio device (4) from the exceedance of a maximum internal temperature (TI), wherein a power loss (V) of the component (6) is determined, a measurement temperature (TM) is measured on the component (6), a temperature difference (DT) for the component (6) between the measurement temperature (TM) on the component and the internal temperature (TI) is determined from the power loss (V) by means of a thermal model (14) of the component (6), the internal temperature (TI) is determined as the sum of the measurement temperature (TM) and the temperature difference (DT), a permissible maximum value (VM) for the power loss (V) is determined on the basis of the internal temperature (TM) and known component data (16) of the component (6), and the component (6) is operated in a normal operating mode (N) if the power loss (V) does not exceed the maximum value (VM) or the component (6) is otherwise operated in reduced-power economy operating mode (S)

Abstract: The invention relates to a method for operating a class-D amplifier (2) for an audio signal (4), which class-D amplifier contains an output stage (10) and a signal-processing unit (12) in a signal path (6), wherein a voltage (U) of at least two magnitudes (U1, U2) is provided for the output stage (10), a voltage requirement (B) of the output stage (10) for the audio signal (4) is predictively determined from the audio signal (4) at a measurement location (14) before the signal-processing unit (12), a magnitude (U1, U2) that is minimally sufficient for the voltage requirement (B) is selected on the basis of the voltage requirement (B) and said magnitude is applied to the output stage (10) before the amplification.

Abstract: The invention relates to a method for operating a class-D amplifier (2) for an audio signal (4), which class-D amplifier contains an output stage (10) and a signal-processing unit (12) in a signal path (6), wherein a voltage (U) of at least two magnitudes (U1, U2) is provided for the output stage (10), a voltage requirement (B) of the output stage (10) for the audio signal (4) is predictively determined from the audio signal (4) at a measurement location (14) before the signal-processing unit (12), a magnitude (U1, U2) that is minimally sufficient for the voltage requirement (B) is selected on the basis of the voltage requirement (B) and said magnitude is applied to the output stage (10) before the amplification.

Abstract: The invention relates to a method for protecting a component (6) within an audio device (4) from the exceedance of a maximum internal temperature (TI), wherein a power loss (V) of the component (6) is determined, a measurement temperature (TM) is measured on the component (6), a temperature difference (DT) for the component (6) between the measurement temperature (TM) on the component and the internal temperature (TI) is determined from the power loss (V) by means of a thermal model (14) of the component (6), the internal temperature (TI) is determined as the sum of the measurement temperature (TM) and the temperature difference (DT), a permissible maximum value (VM) for the power loss (V) is determined on the basis of the internal temperature (TM) and known component data (16) of the component (6), and the component (6) is operated in a normal operating mode (N) if the power loss (V) does not exceed the maximum value (VM) or the component (6) is otherwise operated in reduced-power economy operating mode (S)

Abstract: An amplifier arrangement for amplifying at least one first and one second audio input signal. In one embodiment, the arrangement includes a master amplifier designed as a class D amplifier. The first audio input signal is applied to the master audio input and a master audio output signal is applied to the master audio output. The arrangement also includes a master feedback loop; thus enabling the master amplifier to be designed as a self-oscillating class D amplifier having a master oscillation frequency, at least one slave amplifier, a slave feedback loop, wherein a slave audio output signal or signal portions thereof are fed back into a slave audio input, and a master-slave coupling loop, wherein the master audio output signal or signal portions thereof is coupled into the slave audio input, so that the slave amplifier has the master oscillation frequency as its oscillation frequency.

Abstract: An amplifier arrangement for amplifying an audio input signal AES into an audio output signal AAS, having a conditioning apparatus for converting the audio input signal AES into a conditioned intermediate signal ZS. The conditioning apparatus includes an audio input interface for accepting the audio input signal and a digital data processing device. The amplifier arrangement also includes an amplifier apparatus for amplifying the intermediate signal ZS into the audio output signal AAS and the amplifier apparatus has at least one operating voltage BS. The amplifier arrangement also includes a limiting module for limiting the audio output signal AAS by changing a gain parameter VK.

Abstract: An amplifier arrangement with a Class D design is proposed which has a low-pass filter device comprising a first inductor and a second inductor The first inductor is arranged between a first load output and a load and the second inductor is arranged between a second load output and the load. The first and second inductors are coupled to one another so that the total inductance of the two inductors is greater than the sum of the individual inductances of the two inductors and also less than or equal to 1.95 times the sum of the individual inductances of the two inductors.

Abstract: An amplifier arrangement for amplifying an audio input signal AES into an audio output signal AAS, having a conditioning apparatus for converting the audio input signal AES into a conditioned intermediate signal ZS. The conditioning apparatus includes an audio input interface for accepting the audio input signal and a digital data processing device. The amplifier arrangement also includes an amplifier apparatus for amplifying the intermediate signal ZS into the audio output signal AAS and the amplifier apparatus has at least one operating voltage BS. The amplifier arrangement also includes a limiting module for limiting the audio output signal AAS by changing a gain parameter VK.

Abstract: An amplifier arrangement with a Class D design is proposed which has a low-pass filter device comprising a first inductor and a second inductor The first inductor is arranged between a first load output and a load and the second inductor is arranged between a second load output and the load. The first and second inductors are coupled to one another so that the total inductance of the two inductors is greater than the sum of the individual inductances of the two inductors and also less than or equal to 1.95 times the sum of the individual inductances of the two inductors.

Abstract: An amplifier arrangement for amplifying at least one first and one second audio input signal. In one embodiment, the arrangement includes a master amplifier designed as a class D amplifier. The first audio input signal is applied to the master audio input and a master audio output signal is applied to the master audio output. The arrangement also includes a master feedback loop; thus enabling the master amplifier to be designed as a self-oscillating class D amplifier having a master oscillation frequency, at least one slave amplifier, a slave feedback loop, wherein a slave audio output signal or signal portions thereof are fed back into a slave audio input, and a master-slave coupling loop, wherein the master audio output signal or signal portions thereof is coupled into the slave audio input, so that the slave amplifier has the master oscillation frequency as its oscillation frequency.