Loudspeaker Power Amplifier and Loudspeaker
A loudspeaker power amplifier comprising a digital amplifier is provided. The amplifier has a negative input and a positive input as well as a negative output and a positive output. The power amplifier further comprises a first feedback circuit from the positive output to the negative input, and a second feedback circuit from the negative output to the positive input. The first and the second feedback circuit each have a first and a second amplification circuit.
1 . A loudspeaker power amplifier, comprising:
a digital amplifier, having a negative input and a positive input and a negative output and a positive output and
a first feedback circuit from the positive output to the negative input
a second feedback circuit from the negative output to the positive input
wherein the first and the second feedback circuit each have a first and second active amplification circuit.
2 . A loudspeaker power amplifier according to claim 1 , further comprising:
a first smoothing circuit at the positive output of the digital amplifier for smoothing the output signals of the positive output, and
a second smoothing circuit at the negative output of the digital amplifier for smoothing the output signals of the negative output.
3 . A loudspeaker power amplifier according to claim 1 , wherein
the first and second active amplifier circuit each have a frequency response with an amplification and a phase,
wherein the amplification at a frequency of 1 kHz is greater than 6 dB and the amplification at frequencies above 70 kHz is less than 1 dB and
wherein the phase in the frequency range of 70 kHz to 500 kHz lies above −15°.
4 . A loudspeaker amplifier according to claim 1 , wherein
the first and the second feedback circuit each feed back an alternating voltage.
5 . A loudspeaker comprising:
a loudspeaker power amplifier according to claim 1 .