• 状态 Resolved
  • 已锁定 已锁定
  • 个回复 6 个回复
  • 名订阅用户 19 名订阅用户
  • 次查看 2721 次查看
  • 用户 0 名在线用户
选项
选项
相关

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

关于TLV320AIC3106设置High Pass去除直流偏移

yan liu2
Prodigy 170 points
Other Parts Discussed in Thread: TLV320AIC3106

      我使用TLV320AIC3106进行音频采集时出现直流偏移现象，因此我打算设置高通滤波器来去掉直流偏移。

我设置了 page0/register12 为0xA0，得到一个高通滤波。但是，我发现这个寄存器只能设置三种高通滤波，最小的经计算得到206Hz。

我希望保留50Hz~206Hz的音频，因此这种方式是不可行的。我打算使用page1来实现自定义的High Pass。我使用软件得到一个结果，如下：

我做了如下设置：

AIC3106_writeRegister(107, 0xC0);   // page0/register 107 设置High Pass模式

AIC3106_writeRegister(0, 1);

AIC3106_writeRegister(65, 0x7F);
AIC3106_writeRegister(66, 0xA1);
AIC3106_writeRegister(67, 0x80);
AIC3106_writeRegister(68, 0x5F);
AIC3106_writeRegister(69, 0x7F);
AIC3106_writeRegister(70, 0x44);

AIC3106_writeRegister(71, 0x7F);
AIC3106_writeRegister(72, 0xA1);
AIC3106_writeRegister(73, 0x80);
AIC3106_writeRegister(74, 0x5F);
AIC3106_writeRegister(75, 0x7F);
AIC3106_writeRegister(76, 0x44);

AIC3106_writeRegister(0, 0);

但是，直流偏移没有被消除，我想知道如何正确的去自定义设置High Pass？

谢谢！

  • 0
    TI__Expert 8935 points

    Hi，

    你还要设置一下Page 0/Register 12，使能ADC的High Pass Filter，选三种模式中的一种就行了，它加载系数时就不是预置的了，而是你设置的了。

  • 0 回复 Jacky Wang(QD)
    Prodigy 170 points

    Hi Jacky ：

                 我设置了Page 0/Register 12，但是发现不是我要的40Hz，而是Page 0/Register 12的设置起作用了。

                 我把page0/Register107 设置成0XC8，还是不行！我的配置如下，请问错误在哪里？

    AIC3106_writeRegister(12, 0x00);
    AIC3106_writeRegister(107, 0xC08);

    AIC3106_writeRegister(AIC3106_REG_PAGESELECT, 1);

    AIC3106_writeRegister(65, 0x7F);
    AIC3106_writeRegister(66, 0xFF);
    AIC3106_writeRegister(67, 0x80);
    AIC3106_writeRegister(68, 0x01);
    AIC3106_writeRegister(69, 0x7F);
    AIC3106_writeRegister(70, 0x54);

    AIC3106_writeRegister(71, 0x7F);
    AIC3106_writeRegister(72, 0xFF);
    AIC3106_writeRegister(73, 0x80);
    AIC3106_writeRegister(74, 0x01);
    AIC3106_writeRegister(75, 0x7F);
    AIC3106_writeRegister(76, 0x54);

    AIC3106_writeRegister(AIC3106_REG_PAGESELECT, 0);
    AIC3106_writeRegister(12, 0x60);

    谢谢！


                 

  • 0 回复 Jacky Wang(QD)
    Prodigy 170 points

    Hi Jacky：

               我测试了一下，结果和预期的不相符。 加载系数时是预置的了，而不是我在page2设置的。

               我的修改如下：

    AIC3106_writeRegister(12, 0x00);
    AIC3106_writeRegister(107, 0xC08);

    AIC3106_writeRegister(AIC3106_REG_PAGESELECT, 1);

    AIC3106_writeRegister(65, 0x7F);
    AIC3106_writeRegister(66, 0xFF);
    AIC3106_writeRegister(67, 0x80);
    AIC3106_writeRegister(68, 0x01);
    AIC3106_writeRegister(69, 0x7F);
    AIC3106_writeRegister(70, 0x54);

    AIC3106_writeRegister(71, 0x7F);
    AIC3106_writeRegister(72, 0xFF);
    AIC3106_writeRegister(73, 0x80);
    AIC3106_writeRegister(74, 0x01);
    AIC3106_writeRegister(75, 0x7F);
    AIC3106_writeRegister(76, 0x54);

    AIC3106_writeRegister(AIC3106_REG_PAGESELECT, 0);
    AIC3106_writeRegister(12, 0xF0);

    是我的设置有问题吗？

    谢谢！

  • 0 回复 yan liu2
    TI__Expert 8935 points

    Hi，

    AIC3106_writeRegister(107, 0xC08)这个要设成0xC8，不是C08。另外要注意ADC的programmable filter只支持一阶的，只有N0、N1和D1系数，用工具计算时只能选butterworth1型的。

    设置的时候先写page1的系数，再写page0的控制寄存器。

  • 0 回复 Jacky Wang(QD)
    Prodigy 170 points

    Hi Jacky：

                 Thank you very much!The problem has been solved!

    Best Wish For You！

  • 0 回复 yan liu2
    Prodigy 120 points

    你好，我看到手册里有那个高通的公式，请问那个要怎么算啊  z是什么啊？？？