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The left and right channels are produced through a simple matrix: Left = Mid + Side; Right = Mid − Side (the polarity-reversed side signal). This configuration produces a completely mono-compatible signal and, if the Mid and Side signals are recorded (rather than the matrixed Left and Right), the stereo width can be manipulated after the ...
Panning can also be used in an audio mixer to reduce or reverse the stereo width of a stereo signal. For instance, the left and right channels of a stereo source can be panned straight up, which is sent equally to both the left output and the right output of the mixer, creating a dual mono signal. [citation needed]
The central concept behind transaural stereo is that there are two loudspeakers and a single listener (two ears). The left-channel signal should only reach the left ear and the right-channel signal should only reach the right ear, each with appropriate timbral corrections. To effect this, a circuit or computer algorithm is devised.
The original audio signal was left alone and broadcast as it always had been. Under MTS, this is the Main Channel. The actual signal in this channel is constructed by adding together the two stereo channels to produce a signal largely identical to the original monoaural signals and can be received on any NTSC television even without stereo ...
Blumlein proposed an alternative approach: stereo consists of a monaural signal M, which is common to both left and right louspeaker channels, and a differential side signal S that defines spatial distribution of sound. [41] The M and S signals are easily derived from L and R by addition and subtraction: M = 0.7017 (L + R) S = 0.7017 (L – R),
Its function is to plot a signal on a two-dimensional area so that the correlation between the two axes (audio channels, or phases) becomes apparent.. The channels are plotted on diagonal axes; a left-channel-only signal would form a diagonal line running top-left to bottom-right and a right-channel-only signal would form the opposite diagonal running top-right to bottom-left.
This configuration produces a completely mono-compatible signal and, if the Mid and Side signals are recorded (rather than the matrixed Left and Right), the stereo width (and with that, the perceived distance of the sound source) can be manipulated after the recording has taken place.
The function of the center channel can either be of a monophonic nature (as with dialogue) or it can be used in combination with the left and right channels for true three-channel stereo. Motion Pictures tend to use the center channel for monophonic purposes with stereo being reserved purely for the left and right channels.