作为测量标准,信噪比(SNR)、无杂散动态范围(SFDR)和有效位数(ENOB)考虑了模数转换器在对单音正弦波输入进行响应时的整个奈奎斯特频带。然而,实际应用中大多数信号并不是单音正弦波,而且大部分系统中数字化信号的带宽几乎从来都不会等同于奈奎斯特带宽。许多应用被设计用于处理带宽远远小于整个输入带宽的非正弦波信号,它们包括: As a measure, the signal-to-noise ratio (SNR), spurious-free dynamic range (SFDR), and effective number of bits (ENOB) take into account the entire Nyquist band of the analog-to-digital converter when it responds to a single-sine input. However, most of the signals in practice are not monaural sine waves, and the bandwidth of digitized signals in most systems is almost never equal to the Nyquist bandwidth. Many applications are designed to handle non-sinusoidal signals with much less bandwidth than the entire input bandwidth, including: