公开(公告)号：EP1691487A1

公开(公告)日：2006-08-16

申请号：EP05425062.6

申请日：2005-02-10

Applicant: STMicroelectronics S.r.l.

Inventor： Grosso, Antonio ,  Meroni, Cristiano ,  Botti, Edoardo

IPC: H03M1/18

CPC classification number: H03M1/70

Abstract: The dynamic range of operation of a digital-to-analog converter of an audio system, including at least first and second subsets of individually selectable elementary current sources for delivering analog output current contributions, a code conversion circuit for selecting elementary current sources of said subsets first and second in function of the value of each sampled code of a pulse code modulated input signal, is embedded by multiplying by a certain factor incoming digital codes of said pulse code modulated input signal after their value has remained lower than a predefined threshold value for a certain period of time and for as long as their value equals or surpasses than said threshold value and correspondingly scaling and de-scaling by the same factor the amplitude of said analog output current contributions produced by the elementary current sources of said two subsets.

Abstract translation: 音频系统的数模转换器的动态动态范围，包括用于传送模拟输出电流贡献的单独可选择的基本电流源的至少第一和第二子集;代码转换电路，用于选择所述子集的基本电流源 在脉冲编码调制输入信号的每个采样码的值的函数中的第一和第二功能通过将所述脉冲编码调制输入信号的输入数字代码的值固定低于预定义的阈值 只要它们的值等于或超过所述阈值，并且通过相同的因子相应地缩放和缩小由所述两个子集的基本电流源产生的所述模拟输出电流贡献的幅度。

公开(公告)号：EP1691487B1

公开(公告)日：2009-12-02

申请号：EP05425062.6

申请日：2005-02-10

Applicant: STMicroelectronics S.r.l.

Inventor： Grosso, Antonio ,  Meroni, Cristiano ,  Botti, Edoardo

IPC: H03M1/70

CPC classification number: H03M1/70