Method and a device for reproducing low frequency sound in a rectangular room

摘要

For reproducing sound in a rectangular room in association with a video playback screen (10), from audio signals of the kind comprising at least three main channels (2, 3, 4) and a bass effects channel (1), at least five loudspeakers (11, 12, 13, 14, 15) are used that are specialized for reproducing audio frequencies lower than 120 Hz, four of which (11, 13, 14, 15) are arranged in four respective corners of the room and at least one of them (12) is arranged in the proximity of the screen. The two loudspeakers (14, 15) arranged in the corners furthest away from the screen receive either a signal constituted by the sum of the signals for the other loudspeakers with polarity inversion, with individual delays, and with lowpass filtering, or else a signal coming from a microphone (23, 25) arranged in the immediate proximity of each of the two loudspeakers (14, 15) concerned, the microphone signal being inverted in polarity and lowpass filtered.

主权项

1. A method of reproducing low frequency sound in a rectangular room for reproducing sound from audio signals via at least three “main” channels and a “bass effects” channel in association with a video playback screen, which method comprises using at least five loudspeakers specialized in reproducing audio frequencies lower than 120 Hz, placing four loudspeakers selected from said at least five loudspeakers in four respective corners of said rectangular room, and placing at least one loudspeaker selected from said at least five loudspeakers in the proximity of said video playback screen, the method being characterized by selecting from said four loudspeakers first and second loudspeakers that are arranged in corners of said rectangular room that are furthest away from said video playback screen, configuring said first and second loudspeakers in such a manner that they receive a signal constituted by the sum of the signals for the other loudspeakers but with inverted polarity, with individual delays, and lowpass filtering and choosing said first and second loudspeakers in such a manner that they have a resonant frequency higher than 120 Hz.