| 单词 | beats |
| 释义 | beats A periodic increase and decrease in loudness heard when two notes of slightly different frequency are sounded at the same time. If a note of frequency n is heard at the same time as a note of frequency m, the resulting note will have a frequency of about (n+m)/2. However the amplitude of this note will vary from the difference to the sum of the amplitudes of them and n notes and the frequency (called the beat frequency ) of this variation will be (m-n). The beating sound produced occurs as the waves successively reinforce and oppose each other as they move in and out of phase. Beating also occurs with radio-frequency waves and is made use of in heterodyne devices. See also interference |
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