公开(公告)号：US20170201219A1

公开(公告)日：2017-07-13

申请号：US15417424

申请日：2017-01-27

Applicant: Apple Inc.

Inventor： Frank Baumgarte ,  Eric A. Allamanche ,  Stefan K.O. Strommer

IPC: H03G3/20 ,  H03G7/00 ,  G10L19/008

CPC classification number: H03G3/20 ,  G10L19/008 ,  G10L21/0316 ,  H03G7/007

Abstract: An audio normalization gain value is applied to an audio signal to produce a normalized signal. The normalized signal is processed to compute dynamic range control (DRC) gain values in accordance with a selected one of several pre-defined DRC characteristics. The audio signal is encoded, and the DRC gain values are provided as metadata associated with the encoded audio signal. Several other embodiments are also described and claimed.