In1943, Carl Zeiss also developed a procedure to measure lens imagequality with so-called “MTF” curves (modulation transfer function), which numerous manufacturers today use for quality control.

1943年卡尔蔡司同样研发了一套利用MTF（调制传递函数）

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Here we analyzed the quality property, modulation manner and identification of various kind of transmitter with several practical application cases.

分析各类光发射机的鉴别、调制方式和质量指标特性，并举出实际应用事例。

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Modulation transfer function can be used for evaluating the quality of optical pictorial transfer in optical systems.

光学图像在光学系统中传递的质量可以用调制传递函数评价。

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AM radio can be sent over larger distances, but the quality of the sound is not as good as a later kind of radio signal processing, called frequency modulation.

VOA: special.2010.12.08