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Systems and methods for reduction of audio artifacts in an audio system with dynamic range enhancement

机译:用于通过动态范围增强来减少音频系统中的音频伪像的系统和方法

摘要

In accordance with embodiments of the present disclosure, a control circuit may be configured to, responsive to an indication to switch between gain modes of a signal path having an analog path portion and a digital signal path portion, switch a selectable analog gain of the analog path portion between a first analog gain and a second analog gain, switch a selectable digital gain of the digital signal path portion between a first digital gain and a second digital gain, wherein the product of the first analog gain and the first digital gain is approximately equal to the product of the second analog gain and the second digital gain, and control an analog response of the signal path to reduce the occurrence of audio artifacts present in the output signal as a result of the switch between gain modes of the signal path.;A signal path may have an analog path portion and a digital signal path portion. The digital portion may have a selectable digitally-controlled gain and may be configured to convert a digital audio input signal into an analog input signal in conformity with the selectable digitally-controlled gain, the digital signal path portion comprising a modulator including a forward path and a feedback path. The forward path may include a loop filter for generating a filtered signal responsive to the digital audio input signal and a feedback signal, a quantizer responsive to the filtered signal for generating a quantized signal, and a first gain element configured to apply the selectable digitally-controlled gain to a signal within the forward path. The feedback path may be configured to generate the feedback signal responsive to the quantized signal, the feedback path including a second gain element having a gain inversely proportional to the selectable digitally-controlled gain.
机译:根据本公开的实施例,控制电路可以被配置为响应于在具有模拟路径部分和数字信号路径部分的信号路径的增益模式之间切换的指示,切换模拟信号的可选模拟增益。在第一模拟增益和第二模拟增益之​​间的路径部分,在第一数字增益和第二数字增益之间切换数字信号路径部分的可选数字增益,其中第一模拟增益和第一数字增益的乘积约为等于第二模拟增益和第二数字增益的乘积,并控制信号路径的模拟响应,以减少由于信号路径的增益模式之间的切换而在输出信号中出现音频伪像的情况。信号路径可以具有模拟路径部分和数字信号路径部分。数字部分可以具有可选的数字控制增益,并且可以被配置为根据可选的数字控制增益将数字音频输入信号转换为模拟输入信号,数字信号路径部分包括调制器,该调制器包括前向路径和反馈路径。前向路径可以包括:环路滤波器,用于响应于数字音频输入信号和反馈信号而生成滤波信号;量化器,响应于滤波后的信号以生成量化信号;以及第一增益元件,其被配置为应用可选的数字-前向路径内信号的受控增益。反馈路径可以被配置为响应于量化信号而生成反馈信号,该反馈路径包括第二增益元件,该第二增益元件具有与可选数字控制增益成反比的增益。

著录项

  • 公开/公告号US9998823B2

    专利类型

  • 公开/公告日2018-06-12

    原文格式PDF

  • 申请/专利权人 CIRRUS LOGIC INC.;

    申请/专利号US201414507372

  • 申请日2014-10-06

  • 分类号H04R3;H03G3/20;H03G3;H04R3/04;H03G3/30;H03G9;

  • 国家 US

  • 入库时间 2022-08-21 12:55:18

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