Audio Post Production Knowledge Base

Today's Audio Term: Matrix When audio engineers matrix...

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Trigger Tone
A trigger tone is a 12kHz sine wave that was used to "trigger," or turn on, the surround channel of a discrete LCRS (Left channel, Center channel, Right channel, Surround channel) Cinemascope™ print. Early LCRS surround mixes for Cinemascope films contained very little surround

Modulating Hiss
Modulating hiss refers to noise levels that noticeably rise and fall with program level. For example, a common occurrence of modulating hiss can be heard when noise levels rise around each spoken word of dialogue in a soundtrack.

Lt/Rt
Lt/Rt (Left total / Right total) stereo indicates two channels of program that exist as an encoded matrix of four discrete source channels. When Dolby® decoded, the two-channel matrix will play back as LCRS (left, center, right, surround). Lt/Rt tracks are also designed to sound natural in a two