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    • 8. 发明授权
    • Analog-digital conversion system
    • 模数转换系统
    • US4695825A
    • 1987-09-22
    • US856832
    • 1986-04-28
    • Graham P. BloyJohn L. Miramonti
    • Graham P. BloyJohn L. Miramonti
    • H03M1/00H03M1/02
    • H03M1/069
    • An analog-digital conversion system is used with a microprocessor having an algorithm by which digital signal processing is carried out by the microprocessor. The A/D conversion system converts analog signals to offset binary form for processing by the microprocessor during repetitive cycles of operation. The conversion system includes a sample-and-hold (S/H) circuit for periodically sampling the value of the analog input and an A/D converter for converting sampled input into the digital format. Timing circuitry of the system generates a plurality of control signals during each such cycle of operation. Such timing circuitry controls the S/H circuit, the A/D converter and the microprocessor, as well as a D/A converter which reconverts the processed data into analog format. Logic circuitry selectively shortens the duration of at least one interval associated with the control signals to reduce overall processing duration. Such reduction is carried out by shortening a successive timing state, and also by employing clock circuitry which switches between two different clock rates. Real-time digital processing of voice signals by the microprocessor is made possible.
    • 模拟数字转换系统与具有微处理器执行数字信号处理的算法的微处理器一起使用。 A / D转换系统将模拟信号转换为偏移二进制形式,以在重复的操作周期期间由微处理器进行处理。 转换系统包括用于周期性地对模拟输入值进行采样的采样保持(S / H)电路和用于将采样输入转换为数字格式的A / D转换器。 系统的定时电路在每个这样的操作循环期间产生多个控制信号。 这种定时电路控制S / H电路,A / D转换器和微处理器,以及将处理后的数据转换为模拟格式的D / A转换器。 逻辑电路选择性地缩短与控制信号相关联的至少一个间隔的持续时间,以减少总体处理持续时间。 通过缩短连续定时状态以及通过采用在两个不同时钟速率之间切换的时钟电路来进行这种减少。 微处理器对语音信号的实时数字处理成为可能。