摘要
USB声卡因为其相比板载声卡具有更好的音质输出而受到很多人的青睐。介绍了USB声卡的一般结构,着重介绍了一种高保真USB声卡的设计方案,这个方案较好的地方在于它将接收的USB信号转为IIS信号后,经过8倍的插值滤波,提高采样频率和声道位数,低通滤波采用GIC滤波,其有很好的线性相位特效,可以大大改善声音质量,适合普通中档声卡用户选用。
USB soundcard is popular for its good performance. This paper introduces the soundcard structure. It includes the oversampling digital interpolation filter that can lift sampling frequency and word length. The GIC (generalized immittance converter) is used for the output side,after the DAC,a simple third order filter. The GIC filter provides low distortion and noise which can make the sound better.
出处
《电子测量技术》
2012年第10期127-130,135,共5页
Electronic Measurement Technology
基金
陕西省教育厅基金项目(11JK0548)