可编程的通用过滤器实现C信息加权函数

消息过滤器，模拟人耳的频率响应，是一种常用指定的测试和测量滤波器在美国在欧洲的语音，音频和电子通讯应用，近亲是杂音计噪声加权滤波器。通过级联一个二阶低通部分的三个二阶带通部分，你可以建造两种类型。 C信息滤波器。
Maxim > App Notes > FILTER CIRCUITS (ANALOG) TEMPERATURE SENSORS and THERMAL MANAGEMENT

Keywords: Programmable Universal Filter Implements C-Message Weighting Function Jul 09, 1998

APPLICATION NOTE 11
Programmable Universal Filter Implements C-Message Weighting
Function
The C-message filter, which simulates the frequency response of the human ear, is a commonly specified test
and measurement filter for voice, audio, and telecomunication applications in the U.S. In Europe, a close relative
is a psophometric noise-weighting filter. You can construct either type by cascading three 2nd-order bandpass
sections with a 2nd-order lowpass section. The C-message filter, for example, is shown in Figure 1




Figure 1. Cascaded, 2nd-order universal filter sections implemen