论文部分内容阅读
人耳听到声音的频率应该和音源振动频率相一致,但也会遇到这样的情况,人耳听到声音的频率不等于音源振动发出声音的频率。在这种情况下,人耳听到的声音与音源发出声音的音高不同,这是1843年多普勒发现的一种声音传播现象。他发现听者所听到的音高在音源和观察者位置变动时也会随之变化:如果音源移近观察者或观察者移近音源,人听到的声音比实际音源发出的声音频率高;相反,音源与观察者两者距离增大时,则音高低于实际音源的音高。
The frequency at which human ears hear the sound should be consistent with the frequency of the source vibration, but also encountered when the frequency at which the human ear hears the sound is not equal to the frequency at which the sound source vibrates. In this case, the sound heard by the human ear is different from the sound pitch of the sound source. This is a sound transmission phenomenon discovered by Doppler in 1843. He found that the pitch the listener heard changed as the source and observer position changed: if the source moved closer to the viewer than the observer or observer, the sound heard was louder than the actual one ; On the contrary, when the distance between the sound source and the observer increases, the pitch is lower than the pitch of the actual sound source.