众所周知，物体通过振动从而能够产生声音，声源就是指正在发声的物体。声音

As we all know, objects can produce sound through vibration, and the sound source refers to the object that is making sound. The pitch of the sound is related to the frequency of vibration of the object. The higher the frequency of vibration of the object, the higher the pitch; otherwise, the lower the frequency of vibration, the lower the pitch. Between 20Hz and 20000Hz is the range in which the human ear can easily distinguish the sound. Most sound circuits use sine wave signals to drive the speaker, which can produce pleasant music. In digital circuits, digital pulse signal signals are used to drive speakers, which in turn produce sound. If the frequency of the sound is the same, it is difficult for the human ear to distinguish which is the sound from the pulse signal and which is the sound from the sine wave signal.

It is well known that an object vibrates to produce sound, and the source of sound is an object that is making a sound. The pitch of the sound is related to the frequency of the object's vibration, the higher the frequency of the object's vibration, the higher the tone, and the lower the frequency of the vibration, the lower the tone. Between 20Hz and 20000Hz is the range in which the human ear can easily discern sound, and most sound circuits use sine wave signals to drive speakers, which in turn produces pleasant music. In digital circuits, digital pulse signals are used to drive the speaker, which in turn produces sound. It is difficult for the human ear to tell which is the sound of a pulsesignal and which is the sound of a sine wave signal when the frequency of sound is the same.

As we all know, objects can produce sound through vibration. Sound source is the object that is making sound. The pitch of sound is related to the frequency of object vibration. The higher the frequency of object vibration, the higher the pitch; otherwise, the lower the frequency of vibration, the lower the pitch. Between 20Hz and 20000hz is the range of sound that can be easily distinguished by human ears. Most of the audio circuits use sine wave signals to drive the speakers, which can produce pleasant music. In the digital circuit, the digital pulse signal is used to drive the loudspeaker and generate sound. If the frequency of sound is the same, it is difficult for human ears to distinguish which is the sound of pulse signal and which is the sound of sine wave signal.<br>