公开(公告)号：US09723420B2

公开(公告)日：2017-08-01

申请号：US14771480

申请日：2014-03-05

Applicant: Apple Inc.

Inventor： Afrooz Family ,  Tom-Davy Saux ,  Martin E. Johnson

IPC: H04R29/00 ,  H04R27/00

CPC classification number: H04R29/002 ,  H04R27/00 ,  H04R29/001 ,  H04R2420/05

Abstract: A system and method for measuring the performance of a plurality of transducers integrated in one or more loudspeakers is described. The method simultaneously drives each transducer to emit sounds corresponding to distinct orthogonal test signals. A listening device senses sounds produced by the orthogonal test signals and analyzes the sensed audio signal to determine the performance of each transducer. By using orthogonal test signals, the multiple transducers may be measured and/or characterized simultaneously and with limited affect from extraneous noises.