公开(公告)号：US6433718B2

公开(公告)日：2002-08-13

申请号：US77268601

申请日：2001-01-30

Applicant: ERICSSON TELEFON AB L M

Inventor： STRINNHOLM DANIEL

IPC: H04L27/26 ,  H03M1/66

CPC classification number: H04L27/2626 ,  H04L27/2607

Abstract: A D/A conversion system includes means for arranging a stream of digital samples into frames, each frame including a guard time period. Means are provided for determining a measure of the overall magnitude of digital samples in each frame. Means increase the magnitude of all samples of frames that have a measure that falls below a predetermined threshold by shifting the samples a common number of bits. A D/A converter converts frames with shifted and frames with unshifted samples. An attenuator attenuates the D/A converted samples of frames with shifted samples to compensate for the magnitude increase.

Abstract translation: D / A转换系统包括用于将数字样本流布置成帧的装置，每个帧包括保护时间段。 提供了用于确定每帧中的数字样本的总体幅度的量度的装置。 意味着通过将样本移位一个公共位数来增加具有低于预定阈值的度量的帧的所有采样的幅度。 D / A转换器转换带有移位的帧和具有未移位样本的帧。 衰减器衰减具有移位样本的D / A转换样本，以补偿幅度增加。