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语音信号数字处理中,需要将模拟语音信号通过 A/D 转换,转为数字语音信号输入到计算机中存贮、处理,或将存贮、处理后的数字信号通过 D/A 转换,再还原成模拟语音信号。IBM—PC/XT 语音输入输出接口板就是为此目的设计的。它主要由 PCM 单路译码器来完成语音信号的 A/D-D/A 转换,与通用12位线性 A/D-D/A 接口板相比,具有结构简单、成本低和使用方便等特点。
In the digital processing of speech signal, the analog speech signal needs to be converted to digital speech signal by A / D converter to be stored, processed, stored in the computer, and the processed digital signal is converted to D / A Analog voice signal. IBM-PC / XT voice input and output interface board is designed for this purpose. It is mainly by the PCM single decoder to complete the voice signal A / D-D / A conversion, compared with the general 12-bit linear A / D-D / A interface board, with simple structure, low cost and easy to use and so on.