What are stereo and surround sound?

                                     What are stereo and surround sound

Car owners often complain that after changing the speakers, they cannot hear surround sound in the car, or there is no stereoscopic effect. After further communication, you will find that many car enthusiasts have no basic concept of surround sound and stereo sound. So, what is the difference between the two?

Stereo (English: Stereo) uses two or more independent sound channels to appear on a pair of symmetrically configured speakers (commonly known as speakers). The sound produced by this method can still remain natural and pleasant in different directions. The opposite is mono.

The American Audio Fidelity Records company introduced stereo into the commercial recording field for the first time in 1957, which was a very important milestone. The year 1957 can be regarded as an important watershed between Mono and Stereo in the history of record recording. Many musicians who passed away before 1957 unfortunately failed to leave any Stereo recordings. Later, in the 1960s, most record companies gradually abandoned mono and switched to two-channel stereo recording. Two-channel stereo sound is still the mainstream specification for listening to music.

Surround sound is a technology that enriches the fidelity and depth of sound reproduction by using multiple audio channels (surround channels) from speakers that surround the listener, and was originally used in movie theaters. Before surround sound, theater sound systems typically had three "screen channels" that played sound from three speakers (left, center, and right) located in front of the audience. Surround sound adds one or more channels of speakers to the sides or behind the listener, creating the impression of sound coming from any horizontal direction (the ground) around the listener.

Compared with stereo sound, which has only one emperor position, surround sound usually has multiple sweet spots for listeners, where the audio effect is best, and presents the listener with a fixed or forward perspective of the sound field at this position. The listener can not only feel the sound source There is a sense of direction, and there is a feeling of being surrounded and surrounded by sound, and the sound source is spreading away and spreading in all directions, which enhances the sense of depth, presence and space of the sound, thereby creating an acoustic effect like being in a karaoke hall or movie theater. The technology enhances the perception of sound spatialization by exploiting sound localization: the listener's ability to identify the location or origin of a detected sound in both direction and distance. This technology works by routing multiple discrete audio signals to a speaker array.