Compensation means for a loudspeaker system and loudspeaker system

Patent metadata

Field	Value
Publication number	US-10872591-B2
Application number	US-201916246088-A
Country	US
Kind code	B2
Filing date	Jan 11, 2019
Priority date	Jul 13, 2016
Publication date	Dec 22, 2020
Grant date	Dec 22, 2020

Abstract

Embodiments provide a compensator for a loudspeaker system having a first loudspeaker group having at least one sound transducer, the first loudspeaker group being configured to generate a first sound signal based on an audio signal, the sound signal having a useful signal portion and a distortion signal portion. The compensator has a second loudspeaker group having at least one sound transducer, the second loudspeaker group being configured to generate a second sound signal based on a compensation signal, the second sound signal compensating and/or reducing the distortion signal portion when superimposed with the first sound signal.

First claim

The invention claimed is:

1. A compensator for a loudspeaker system comprising a first loudspeaker group comprising at least one sound transducer, the first loudspeaker group being configured to generate a first sound signal based on an audio signal, the first sound signal comprising a useful signal portion and a distortion signal portion,
the compensator comprising:
a second loudspeaker group comprising at least one sound transducer, the second loudspeaker group being configured to generate a second sound signal based on a compensation signal, the second sound signal compensating and/or reducing the distortion signal portion when superimposed with the first sound signal;
wherein the compensator comprises a calculating unit comprising a signal synthesizer configured to generate the compensation signal starting from information on the distortion signal portion; and
wherein the calculating unit comprises a signal analyzer configured to analyze the first sound signal relative to the useful signal portion and the distortion signal portion and to extract the information on the distortion signal portion;
wherein the signal synthesizer is configured to invert the extracted distortion signal portion in order to acquire the compensation signal.

2. A loudspeaker system comprising:
a first loudspeaker group comprising at least one sound transducer, the first loudspeaker group being configured to generate a first sound signal based on an audio signal, the first sound signal comprising a useful signal portion and a distortion signal portion; and
a second loudspeaker group comprising at least one sound transducer, the second loudspeaker group being configured to generate a second sound signal based on a compensation signal, the second sound signal compensating and/or reducing the distortion signal portion when superimposed with the first sound signal;
wherein the loudspeaker system comprises a calculating unit comprising a signal synthesizer configured to generate the compensation signal starting from information on the distortion signal portion; and
wherein the calculating unit comprises a signal analyzer configured to analyze the first sound signal relative to the useful signal portion and the distortion signal portion and to extract the information on the distortion signal portion;
wherein the signal synthesizer is configured to invert the extracted distortion signal portion in order to acquire the compensation signal.

3. The loudspeaker system in accordance with claim 2 , wherein superpositioning of the second sound signal and the first sound signal takes place in a sound field generated in space.

4. The loudspeaker system in accordance with claim 2 , wherein the at least one sound transducer of the second loudspeaker group or the second loudspeaker group is oriented relative to a sound field of the first loudspeaker group or a listening position belonging to the first loudspeaker group.

5. The loudspeaker system in accordance with claim 2 , wherein the first loudspeaker group comprises at least one passive sound transducer.

6. The loudspeaker system in accordance with claim 2 , wherein the first loudspeaker group comprises a plurality of independent sound transducers for reproducing a stereo sound field and/or a surround sound field.

7. The loudspeaker system in accordance with claim 3 , wherein the first loudspeaker group is spaced apart from the second loudspeaker group at a distance of at most 3 m or, advantageously, at most 1 m so that superpositioning takes place in the nearfield of the first loudspeaker group.

8. The loudspeaker system in accordance with claim 2 , wherein the signal analyzer for analyzing receives the audio signal and compares the same to the first sound signal.

9. The loudspeaker system in accordance with claim 2 , wherein the information on the distortion signal portion comprises the distortion signal portion isolated from the useful signal portion.

10. The loudspeaker system in accordance with claim 2 , wherein the signal synthesizer is configured to determine the compensation signal while considering the transfer function of the at least one sound transducer of the second loudspeaker group.

11. The loudspeaker system in accordance with claim 2 , wherein the signal analyzer comprises a measurer for measuring the acceleration, velocity and/or deflection of the membrane or a measurer for measuring the air-borne or structure-borne sound and/or a microphone and/or a processor for electrical measurements at the loudspeaker terminals.

12. The loudspeaker system in accordance with claim 2 , wherein the signal analyzer comprises a processor for modeling and simulating the useful signal portion and distortion signal portion.

13. The loudspeaker system in accordance with claim 2 , wherein the second loudspeaker group comprises a plurality of independent sound transducers and is configured to emit the second sound signal by means of beamforming.

14. The loudspeaker system in accordance with claim 2 , wherein the second loudspeaker group comprises a plurality of independent sound transducers and is configured to generate several second sound signals for several sound fields.

15. A calculating unit comprising a signal synthesizer,
wherein the signal synthesizer is configured to determine a compensation signal starting from information on a distortion signal portion which, together with a useful signal portion is comprised by a first sound signal generated by a first loudspeaker group on the basis of an audio signal,
wherein the compensation signal is suitable to compensate and/or reduce the distortion signal portion when outputting the same as a second sound signal via a second loudspeaker group by superpositioning with the first sound signal;
wherein the signal synthesizer is configured to generate the compensation signal starting from information on the distortion signal portion; and
wherein the calculating unit comprises a signal analyzer configured to analyze the first sound signal relative to the useful signal portion and the distortion signal portion and to extract the information on the distortion signal portion;
wherein the signal synthesizer is configured to invert the extracted distortion signal portion in order to acquire the compensation signal.

16. A method for generating a useful signal portion, comprising:
outputting, using a first loudspeaker group comprising at least one sound transducer, a first sound signal based on an audio output signal, the first sound signal comprising a useful signal portion and a distortion signal portion;
determining a compensation signal starting from information on a distortion signal portion which, together with a useful signal portion, is comprised by a first sound signal; and
outputting, using a second loudspeaker group comprising at least one sound transducer, a second sound signal based on the compensation signal, the second sound signal compensating and/or reducing the distortion signal portion when superimposed with the first sound signal;
wherein determining comprises generating the compensation signal starting from information on the distortion signal portion, analyzing the first sound signal relative to the useful signal portion and the distortion signal portion, extracting the information on the distortion signal portion and inverting the extracted distortion signal portion in order to acquire the compensation signal.

17. A method for calculating a compensation signal, comprising:
determining a compensation signal starting from information on a distortion signal portion which, together with a useful signal p

Assignees

• Fraunhofer Ges Forschung

Inventors

• Betz Lorenz
• Wolf Maximilian

Classifications

• G10K2210/1053

  Hi-fi, i.e. anything involving music, radios or loudspeakers · CPC title

• H04S7/301

  Automatic calibration of stereophonic sound system, e.g. with test microphone · CPC title

• H04R2201/403

  Linear arrays of transducers · CPC title

• H04R1/403

  loud-speakers · CPC title

• H04R1/2834

  for loudspeaker transducers · CPC title