A periodic or continuous check of such channel characteristics as delay distortion, frequency response, and noise in an effort to reduce or eliminate the causes of errors.
周期性地或连续地检验通道的某些性能，如延迟失真、频率响应及噪声等，以便消除或减少引起错误的原因。
Only four parameters are needed to define everything that matters for audio reproduction: Noise, frequency response, distortion, and time-based errors.
对声频复制来说，所以重要的事情都可以用四个参数来标出：噪音，频率响应，失真，时基误差。
Nearby room boundaries can create frequency response errors (called comb filtering) due to wave reflections combining in the air.
声频设备附近的墙壁会反射声波，空气中的声波叠加，产生频率响应误差(亦称梳状滤波器)。
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