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1 英语原意
调幅 AM：Amplitude Modulation，调频 FM: Frequency Modulation
2 英文解释
2.1 Amplitude
noun (CURVE)[ C usually singular ] PHYSICS specialized
the distance between the top and the bottom of a wave
幅度；振幅；波幅
2.2 Frequency
frequency noun (LIGHT/SOUND/RADIO)
[ U ] PHYSICS specialized
the number of times that a wave, especially a light, sound, or radio wave, is produced within a particular period, especially one second
（尤指声波或无线电波每秒振动的）频率
2.3 modulation noun (SIGNALS)
[ C or U ] MEDIA, PHYSICS specialized
the process of changing the amplitude or frequency of an electrical signal by mixing it with another signal, or a signal that has been changed like this
（对电波信号的）调制
With traditional radar, the modulation and frequency of the signal can be fine-tuned to produce the easiest-to-read echo.
使用传统雷达，可以对信号的调制和频率进行微调，以产生最容易读取的回波。
3 中文解释
幅度调制 (AM) 通过改变载波的幅度来编码信息。调频 (FM) 通过改变载波的频率来传送信息。FM 不易受幅度变化和噪声的影响，提供比 AM 更好的信号质量。
AM（Amplitude Modulation）无线电信号通过改变载波的幅度来传输信息，更容易受到噪声和干扰，导致音质较低。
FM（调频）无线电信号通过改变载波频率来传达信息，提供更好的音质和抗干扰性，但与 AM 信号相比范围更有限。
AM 和 FM 之间的主要区别在于它们的调制技术，AM 调整幅度而 FM 改变频率，这会影响信号范围、音质和抗干扰性。
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