sps: Samples per second. In data conversion, an analog signal is converted to a stream of numbers, each representing the analog signal's amplitude at a moment in time. Each number is called a "sample." The number sample per second is called the sampling rate, measured in samples per second.
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为了便于应用,可以把香农采样定理表述为,离散采样的频率 应大于或等于被采样信 号包含的最高频率 的两倍。