Audio amplifier
Assigneed&b audiotechnik GmbH
InventorsSven Moertel, Claus Renftle, Hermann Vogt
Life of this patent
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Abstract
An audio amplifier may comprise a signal limiting circuit and a power amplifier. The signal limiting circuit may be configured to limit an audio signal received at an input and to provide it as a limited audio signal at an output. The power amplifier may have a supply connection which may be coupled to a power supply unit in order to supply power to the power amplifier. The power amplifier may be configured to amplify a signal, which may be based on the limited audio signal, and to provide it as a level-limited audio signal at an output which may be coupled to a load, so that the load may be operated at limited power. The signal limiting circuit may be configured to produce an audio signal which may be limited depending on the load.
Claims20
An audio amplifier, comprising:
- a signal limiting circuit configured to:
- limit an audio signal received at an input;
- and
- provide the limited audio signal at a first output;
- and
- a power amplifier comprising a supply connection configured to be coupled to a power supply unit to supply power to the power amplifier, the power amplifier configured to:
- amplify a signal based on the limited audio signal;
- and
- provide the amplified signal as a level-limited audio signal at a second output configured to be coupled to a load, such that the load can be operated at limited power, the signal limiting circuit configured to produce an audio signal that is limited based on the load, the signal limiting circuit configured to determine the audio signal based on a function of a prescribable maximum input power of the power amplifier, an output power of the power amplifier and a virtual capacitance.
A method for amplifying an audio signal, comprising:
- limiting the audio signal to produce a limited audio signal, the limiting comprising determining the audio signal based on a function of a prescribable maximum input power, an output power and a virtual capacitance;
- amplifying a signal based on the limited audio signal to produce a level-limited audio signal;
- and
- providing the level-limited audio signal at an output configured to be coupled to a load, such that the load can be operated at limited power, the limiting performed based on the load.
An audio amplifier, comprising:
- a signal limiting circuit configured to:
- limit an audio signal received at an input;
- and
- provide the limited audio signal at a first output;
- and
- a power amplifier configured to:
- amplify a signal based on the limited audio signal;
- and
- provide the amplified signal as a level-limited audio signal at a second output configured to be coupled to a load, the limiting based on a model of a load-dependent power supply unit associated with an output voltage falling under load, the limiting performed using the following formulae:
- UC=√{square root over ( )}(U02+ΔU2),
- ΔU2=2/C·∫(Pin−Pout)dt,
- where Pin is a maximum prescribable input power on a virtual capacitance C, Pout is an output power on the virtual capacitance C, ΔU is a differential voltage change on the virtual capacitance C, U0 is an initial voltage on the virtual capacitance C, and Uc is the output voltage.
Dependencies are inferred from the claim text.