公开(公告)号：US09743181B2

公开(公告)日：2017-08-22

申请号：US14989727

申请日：2016-01-06

Applicant: Apple Inc.

Inventor： Sylvain J. Choisel ,  Martin E. Johnson ,  Jack Y. Dagdagan

IPC: H04R3/00 ,  H04R29/00 ,  H04R3/04 ,  H04R1/02 ,  H04R1/28

CPC classification number: H04R3/04 ,  H04R1/025 ,  H04R1/2834 ,  H04R1/2884 ,  H04R3/08 ,  H04R29/001

Abstract: A loudspeaker system includes a driver in an enclosure that provides a back volume which is sealed with respect to acoustic pressure waves produced by a driver diaphragm. An external microphone is located outside the back volume. An internal microphone located inside the back volume. A computational unit is coupled to the external microphone and the internal microphone and configured to determine a transfer function for an equalization filter. The transfer function determination is responsive to the external microphone and the internal microphone. A digital signal processor is coupled to a signal source, the driver, and the computational unit. The digital signal processor is configured to implement the equalization filter as determined by the computational unit, create a filtered audio signal from the signal source, and provide the filtered audio signal to the driver.

公开(公告)号：US20170195790A1

公开(公告)日：2017-07-06

申请号：US14989727

申请日：2016-01-06

Applicant: Apple Inc.

Inventor： Sylvain J. Choisel ,  Martin E. Johnson ,  Jack Y. Dagdagan

IPC: H04R3/04 ,  H04R1/02 ,  H04R1/28 ,  H04R29/00

CPC classification number: H04R3/04 ,  H04R1/025 ,  H04R1/2834 ,  H04R1/2884 ,  H04R3/08 ,  H04R29/001

Abstract: A loudspeaker system includes a driver in an enclosure that provides a back volume which is sealed with respect to acoustic pressure waves produced by a driver diaphragm. An external microphone is located outside the back volume. An internal microphone located inside the back volume. A computational unit is coupled to the external microphone and the internal microphone and configured to determine a transfer function for an equalization filter. The transfer function determination is responsive to the external microphone and the internal microphone. A digital signal processor is coupled to a signal source, the driver, and the computational unit. The digital signal processor is configured to implement the equalization filter as determined by the computational unit, create a filtered audio signal from the signal source, and provide the filtered audio signal to the driver.