Speakers are like this:
1. When recording, different sounds and frequencies transmit vibrations through air to the recording device, which will cause corresponding changes in electric current after vibration. The recording device only needs to record these currents;
2. When playing, the electricity is transmitted to the playback device, and the current data will cause corresponding vibration of the playback device, so the sound is restored. In the whole process, the recording and playback device indicates that it does not know what happened, but is only responsible for transmitting information. As for the principle, the speaker can produce different frequency, different amplitude of vibration, amplitude determines the volume, frequency determines the timbre, quality and so on.
To understand why speakers make all kinds of sounds, you need to understand what makes all kinds of sounds. For example, whispering in class and screaming in shock must be completely different sounds; The sound of a gong and a drum is, of course, markedly different.
Most of the sounds we hear in our lives are superimposed by pure tones of many different frequencies.
The main difference between these sounds is the difference in composition. For example, those with more low-frequency sound components will give people a feeling of fullness, fullness and power (such as drum sound). Those with more high-frequency sounds may sound brighter, lighter, sharper, etc.
Some examples are extreme just to get a sense of it. So when the speaker replays the sound, as long as it can rewind the sound components that should be included in each sound, it can restore a variety of sounds
