我们使用讯号对杂讯和失真比当作设计规格而非讯号杂讯比是因为，讯号对杂讯和失真比是讯号杂讯比和总谐波失真的集合，也是类比数位转换器动态效能完整的测量。

We use SNDR instead of SNR as our specification because SNDR is a combination of the SNR and the THD specifications and it is an overall measure of ADC dynamic performance.

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导向孔和双反射带通箱设计比密闭箱的失真更小一些，但是差别不大。

The ported box and the bandpass designs produce less distortion than the sealed box, but the difference is marginal.

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否则如果镜头过近，人脸会因为失真而显得比平常要大。

If not, your face might look bigger than usual due to lens distortion.

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