Stereophonic sound

How stereophonic & duophonic sound systems work. It is an electronic simulation of sound-location-perception.
The main-diagram shows the situation in nature (simplified drawing), and the inset-image shows the electronic simulation. Notably, such audio systems need more-than-1 speakers.

Diagram of Clément Ader's théatrophone prototype at the Opera during the World Exhibition in Paris (1881).

Label and sleeve from Audio Fidelity Records' second stereo demonstration record, ca. 1958.

HH Scott Model 350, ca. 1961: the first FM multiplex stereo tuner sold in the US

Stereophonic sound or, more commonly, stereo, is a method of sound reproduction that creates an illusion of multi-directional audible perspective. This is usually achieved by using two or more independent audio channels through a configuration of two or more loudspeakers (or stereo headphones) in such a way as to create the impression of sound heard from various directions, as in natural hearing. Thus the term "stereophonic" applies to so-called "quadraphonic" and "surround-sound" systems as well as the more common two-channel, two-speaker systems. It is often contrasted with monophonic, or "mono" sound, where audio is heard as coming from one position, often centered in the sound field (analogous to a visual field). In the 2000s, stereo sound is common in entertainment systems such as broadcast radio and TV, recorded music and the cinema.

单词	Stereo channel
释义	Stereo channel 英语百科 Stereophonic sound Stereophonic sound or, more commonly, stereo, is a method of sound reproduction that creates an illusion of multi-directional audible perspective. This is usually achieved by using two or more independent audio channels through a configuration of two or more loudspeakers (or stereo headphones) in such a way as to create the impression of sound heard from various directions, as in natural hearing. Thus the term "stereophonic" applies to so-called "quadraphonic" and "surround-sound" systems as well as the more common two-channel, two-speaker systems. It is often contrasted with monophonic, or "mono" sound, where audio is heard as coming from one position, often centered in the sound field (analogous to a visual field). In the 2000s, stereo sound is common in entertainment systems such as broadcast radio and TV, recorded music and the cinema.
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Stereo channel

Stereophonic sound