Sound wave field generation based on loudspeaker-room-microphone constraints

• US 10,460,716 B2
• Filed: 04/02/2015
• Issued: 10/29/2019
• Est. Priority Date: 04/07/2014
• Status: Active Grant

• Current Assignee: Harman Becker Automotive Systems GmbH (Samsung Group)
• Original Assignee: Harman Becker Automotive Systems GmbH (Samsung Group)
• Inventors: Christoph, Markus
• Primary Examiner(s): Kim, Paul
• Assistant Examiner(s): Suthers, Douglas J
• Application Number:
  US14/677,713
• Publication Number:
  US 20150287400A1
• Time in Patent Office: 1,671 Days
• Field of Search: 381 97, 381 7111, 381 7112, 381 718
• CPC Class Codes: G06F 3/165 Management of the audio stream, e.g. setting of volume, audio stream path
• CPC Class Codes: G10K 11/17817 between the output signals and the error signals, i.e. secondary path
• CPC Class Codes: G10K 11/17854 the filter being an adaptive filter
• CPC Class Codes: G10K 11/17879 using both a reference signal and an error signal
• CPC Class Codes: H04R 2499/13 Acoustic transducers and sound field adaptation in vehicles
• CPC Class Codes: H04S 7/301 Automatic calibration of stereophonic sound system, e.g. with test microphone
• CPC Class Codes: H04S 7/307 Frequency adjustment, e.g. tone control H04S7/301 takes precedence

Abstract

A system and method include filtering with controllable transfer functions in signal paths upstream of K≥1 output paths and downstream of Q≥1 source input paths, and controlling with filter control signals of the controllable transfer functions according to an adaptive control algorithm based on error signals on M≥1 error input paths and source input signals on the Q source input paths. The system and method further include at least one loudspeaker-room-microphone constraint.

Claims

1. A loudspeaker-room-microphone system comprising:

one group of loudspeakers including at least one loudspeaker in a room;

one group of microphones including at least one microphone in the room;

a filter having a controllable transfer function;

a filter controller configured to control the transfer function of the filter according to an adaptive control algorithm based on an error signal that is generated from the at least one microphone and a source input signal from an audio source; and

a gain control filter configured to weight the error signal from the at least one microphone according to a position of the group of microphones in the room to provide a modified error signal to the filter controller;

wherein the filter controller is further configured to control the filter based on a spatial constraint;

wherein the filter is configured to provide a loudspeaker signal to the at least one loudspeaker in the room; and

wherein the gain control filter has a frequency-dependent gain such that a spectral composition of the error signal is modified.

2. The system of claim 1, wherein the filter controller is further configured to control the gain control filter based on:

a frequency constraint that is configured to compensate for differences in acoustic behavior between at least two groups of loudspeakers.

3. The system of claim 2, wherein at least one of the spatial constraint and the frequency constraint corresponds to characteristics of the at least one loudspeaker and the at least one microphone positioned in the room.

4. The system of claim 1 further comprising a plurality of frequency filters configured to implement a frequency constraint that compensates for differences in acoustic behavior between at least two groups of loudspeakers.

5. A loudspeaker-room-microphone system comprising:

a filter having a controllable transfer function; and

a filter controller being configured to control the transfer function of the filter according to an adaptive control algorithm which is based on an error signal that is generated from at least one microphone and on a source input signal from an audio source; and

a gain control filter that is configured to weight the error signal from the at least one microphone according to a position of a group of microphones in a room to provide a modified error signal to the filter controller;

wherein the filter controller is further configured to control the filter based on a spatial constraint; and

wherein the gain control filter has a frequency-dependent gain such that a spectral composition of the error signal is modified.

6. The system of claim 5, wherein the filter controller is further configured to control the gain control filter based on:

a frequency constraint configured to compensate for differences in acoustic behavior between at least two groups of loudspeakers.

7. The system of claim 6, further comprising a plurality of frequency filters configured to provide the frequency constraint.

8. The system of claim 6, wherein at least one of the spatial constraint and the frequency constraint corresponds to characteristics of a loudspeaker and a microphone in the room.