Apparatus and method for providing a loudspeaker-enclosure-microphone system description

Patent metadata

Field	Value
Publication number	US-RE47820-E
Application number	US-201815962792-A
Country	US
Kind code	E1
Filing date	Apr 25, 2018
Priority date	Jul 27, 2012
Publication date	Jan 14, 2020
Grant date	Jan 14, 2020

Abstract

An apparatus for providing a current loudspeaker-enclosure-microphone system description of a loudspeaker-enclosure-microphone system is provided. The apparatus has a first transformation unit for generating a plurality of wave-domain loudspeaker audio signals. Moreover, the apparatus has a second transformation unit for generating a plurality of wave-domain microphone audio signals. Furthermore, the apparatus has a system description generator for generating the current loudspeaker-enclosure-microphone system description based on the plurality of wave-domain loudspeaker audio signals, based on the plurality of wave-domain microphone audio signals, and based on a plurality of coupling values, wherein the system description generator is configured to determine each coupling value assigned to a wave-domain pair of a plurality of wave-domain pairs by determining a relation indicator indicating a relation between a loudspeaker-signal-transformation value and a microphone-signal-transformation value.

First claim

The invention claimed is:

1. An apparatus for providing a current loudspeaker-enclosure-microphone system description of a loudspeaker-enclosure-microphone system, wherein the loudspeaker-enclosure-microphone system comprises a plurality of loudspeakers and a plurality of microphones, and wherein the apparatus comprises:
a first transformation unit for generating a plurality of wave-domain loudspeaker audio signals, wherein the first transformation unit is configured to generate each of the wave-domain loudspeaker audio signals based on a plurality of time-domain loudspeaker audio signals and based on one or more of a plurality of loudspeaker-signal-transformation values, said one or more of the plurality of loudspeaker-signal-transformation values being assigned to said generated wave-domain loudspeaker audio signal,
a second transformation unit for generating a plurality of wave-domain microphone audio signals, wherein the second transformation unit is configured to generate each of the wave-domain microphone audio signals based on a plurality of time-domain microphone audio signals and based on one or more of a plurality of microphone-signal-transformation values, said one or more of the plurality of microphone-signal-transformation values being assigned to said generated wave-domain loudspeaker audio signal, and
a system description generator for generating the current loudspeaker-enclosure-microphone system description based on the plurality of wave-domain loudspeaker audio signals, and based on the plurality of wave-domain microphone audio signals,
wherein the system description generator is configured to generate the current loudspeaker-enclosure-microphone system description based on a plurality of coupling values,
wherein each of the plurality of coupling values is assigned to one of a plurality of wave-domain pairs, each of the plurality of wave-domain pairs being a pair of one of the plurality of loudspeaker-signal-transformation values and one of the plurality of microphone-signal-transformation values,
wherein the system description generator is configured to determine each coupling value assigned to a wave-domain pair of the plurality of wave-domain pairs by determining for said wave-domain pair at least one relation indicator indicating a relation between said one of the one or more loudspeaker-signal-transformation values of said wave-domain pair and said one of the microphone-signal-transformation values of said wave-domain pair to generate the current loudspeaker-enclosure-microphone system description.

2. The apparatus according to claim 1 ,
wherein the system description generator comprises a system description application unit, an error determiner and a system description generation unit,
wherein the system description application unit is configured to generate a plurality of wave-domain microphone estimation signals based on the wave-domain loudspeaker audio signals and based on a previous loudspeaker-enclosure-microphone system description of the loudspeaker-enclosure-microphone system,
wherein the error determiner is configured to determine a plurality of wave-domain error signals based on the plurality of wave-domain microphone audio signals and based on the plurality of wave-domain microphone estimation signals,
wherein the system description generation unit is configured to generate the current loudspeaker-enclosure-microphone system description based on the wave-domain loudspeaker audio signals, based on the plurality of error signals and based on the plurality of coupling values.

3. The apparatus according to claim 2 ,
wherein the first transformation unit is configured to generate each of the wave-domain loudspeaker audio signals based on the plurality of time-domain loudspeaker audio signals and based on the one or more of the plurality of loudspeaker-signal-transformation values, wherein the plurality of loudspeaker-signal-transformation values is a plurality of loudspeaker-signal-transformation mode orders,
wherein the second transformation unit is configured to generate each of the wave-domain microphone audio signals based on the plurality of time-domain microphone audio signals and based on the one or more of the plurality of microphone-signal-transformation values, wherein the plurality of microphone-signal-transformation values is a plurality of microphone-signal-transformation mode orders, and
wherein the system description generation unit is configured to generate the loudspeaker-enclosure-microphone system description based on a first coupling value of the plurality of coupling values, when a first relation value indicating a first difference between a first loudspeaker-signal-transformation mode order of the plurality of loudspeaker-signal-transformation mode orders and a first microphone-signal-transformation mode order of the plurality of microphone-signal mode orders comprises a first difference value,
wherein the system description generation unit is configured to assign the first coupling value to a first wave-domain pair of the plurality of wave-domain pairs, when the first relation value comprises the first difference value,
wherein the first wave-domain pair is a pair of the first loudspeaker-signal-transformation mode order and the first microphone-signal-transformation mode order, and wherein the first relation value is one of the plurality of relation indicators, and
wherein the system description generation unit is configured to generate the loudspeaker-enclosure-microphone system description based on a second coupling value of the plurality of coupling values, when a second relation value indicating a second difference between a second loudspeaker-signal-transformation mode order of the plurality of loudspeaker-signal-transformation mode orders and a second microphone-signal-transformation mode order of the plurality of microphone-signal-transformation mode orders comprises a second difference value, being different from the first difference value,
wherein the system description generation unit is configured to assign the second coupling value to the second wave-domain pair of the plurality of wave-domain pairs, when the second relation value comprises the second difference value,
wherein the second wave-domain pair is a pair of the second loudspeaker-signal-transformation mode order of the plurality of loudspeaker-signal-transformation mode orders and the second microphone-signal-transformation mode order of the plurality of microphone-signal-transformation mode orders,
wherein the second wave-domain pair is different from the first wave-domain pair, and
wherein the second relation value is one of the plurality of relation indicators.

4. The apparatus according to claim 3 ,
wherein the system description generation unit is configured to generate the current loudspeaker-enclosure-microphone system description based on the first coupling value of the first wave-domain pair, when the first loudspeaker-signal-transformation mode order is equal to the first microphone-signal-transformation mode order, and
wherein the system description generation unit is configured to generate the current loudspeaker-enclosure-microphone system description based on the second coupling value of the second wave-domain pair, when the second loudspeaker-signal-transformation mode order is not equal to the second microphone-signal-transformation mode order.

5. The apparatus according to claim 3 ,
wherein the system description generation unit is configured to generate the current loudspeaker-enclosure-microphone system description based on the first coupling value of the first wave-domain pair, when the first loudspeaker-signal-transformation mode order is equal to the first microphone-signal-transformation mode order,
wherein the system description generation unit is confi

Assignees

• Fraunhofer Ges Forschung

Inventors

• Schneider Martin
• Kellermann Walter

Classifications

• H04S2420/13

  Application of wave-field synthesis in stereophonic audio systems · CPC title

• H04S7/301 Primary

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

• H04S2400/09

  Electronic reduction of distortion of stereophonic sound systems · CPC title

• H04R1/02 Primary

  Casings; Cabinets {; Supports therefor;} Mountings therein (H04R1/28 takes precedence {; attachments for microphones H04R1/08; mounting of transducers in earpieces H04R1/1075}) · CPC title

• H04S2420/11

  Application of ambisonics in stereophonic audio systems · CPC title