The Doppler Effect reveals the listening characteristics of moving sounds: when there is relative motion between the sound source and the listener, it will feel that the sound determined by a certain frequency has its tone changed when the sound source approaches the listener. The time is a tone with a slightly higher frequency, and when the sound source is gone, it is a tone with a slightly lower frequency. The amount of change in this frequency is called the Doppler shift. The moving sound source is greater at the same distance from the listener than when it is not moving, and the removed sound source produces less intensity, usually the sound source is concentrated toward the moving direction.
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