公开(公告)号：US09686609B1

公开(公告)日：2017-06-20

申请号：US14320104

申请日：2014-06-30

Applicant: Avnera Corporation

Inventor： Chris O'Connor ,  Xudong Zhao

IPC: H04R1/10 ,  H04R3/12

CPC classification number: H04R3/12 ,  G10L19/012 ,  H04R1/1041 ,  H04R5/04 ,  H04R29/001 ,  H04R2420/05 ,  H04R2460/03

Abstract: A low power, digital audio interface includes support for variable length coding depending on content of the audio data sent from the interface. A particularized coding system is implemented that uses techniques of silence detection, dynamic scaling, and periodic encoding to reduce sent data to a minimum. Other techniques include variable packet scaling based on an audio sample rate. Differential signaling techniques are also used. The digital audio interface may be used in a headphone interface to drive digital headphones. A detector in the interface may detect whether digital or analog headphones are coupled to a headphone jack and drive the headphone jack accordingly.