How is sound recorded in a movie?

In movie and television files, the audio signal contains a wide variety of sound signals, which can be simply divided into 2 categories, i.e., human voice and background sound,? Generally the human voice in the audio signal is concentrated in the mid-frequency band, while the background sound (especially some background fighting sound) has a prominent low-frequency component.

The sound level, timbre, and frequency characteristics of the original signal of the movie sound source are set up with the needs of the movie scene atmosphere, and its purpose is to express the real scene of the movie.

Television is only the original signal sound reproduction without compromise, the purpose is to minimize the audio signal transmission distortion, restore the real scene.

Expanded information:

Television speakers work: When the coil in the speaker is energized, its The coil will produce a magnetic field, in interaction with the magnetic field of the magnet, the coil will vibrate, vibration will produce sound, simply put is the energized conductor in the magnetic field of the force.

When the audio signal current passes through the voice coil of a loudspeaker, the voice coil will be subjected to a force proportional to the audio signal current, due to the steel connection of the voice coil of the loudspeaker and the cone.

When the production time circle in the magnetic air gap with the audio current direction continues to change, and to the up and down vibration, the cone of the speaker will be with the voice coil up and down vibration and vibration, cone vibration speed and the frequency of the input audio current is related.

The amplitude of cone vibration is related to the strength of the input audio current. When the cone vibration excitation of the surrounding air with magnetic vibration, the formation of sound waves, sound waves into the human ear on the formation of the sound we usually hear.