nerally, fixed point devices are cheaper and quicker, but floating point devices are more convenient to program and more suited to calculation-intensive algorithms. Second, the data width of DSP determines how accurately it can represent numbers. Speed is another issue, not only how many cycles occur in each second, but also how many instructions execute in each cycle and how many work each of these instructions plishes. One way to assess the minimum requirements for the DSP is to estimate how instructions must be executed for each received sample. When this number is multiplied by the sampling frequency, the minimum required number of instructions per second is obtained. 为特定的应用选择一个 DSP 并不总是很容易的。第一个决定是是否选择定点或浮点装置。一般来说, 定点设备更便宜,更快, ,但浮点数设备程序更方便,更适合计算密集型算法。第二,数据宽度为 DSP 确定的准确度,它可以表示数字。速度是另外一个
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