话筒屏蔽、频响测试都可以用这个软件。USB Microphones Inadequate Shielding Functional Test
麦克风屏蔽不良功能测试
REV: 001
Logitech Inc.
Prepared: Hashmat Afzali
12/18/07
1.0 Objective 目的
The purpose of this document is to describe and setup a functional test for the USB
microphones. The ideal reason for the test is to make sure that the functional test catches
inadequate microphone shielding.
本文件描述的是如何建立一个 USB 麦克风的功能测试平台，以检测麦克风是否有
屏蔽不良的问题。
1.1 Inadequate shielding description 屏蔽不良的问题
Some USB microphones have shown a 50 to 60 Hz Ground noise coupling to the center
conductor of the microphone cable. This noise is amplified on the input gain stage of the
Micronas Codec and becomes audible. If the microphone cable is shiel……
