Device and method for processing signals of virtual surrounds of four loudspeakers

Abstract

The invention provides a system and a method for processing signals of virtual surrounds of four loudspeakers. The system comprises an input module, a first sound mixer, a second sound mixer, a third sound mixer, a fourth sound mixer, a digital and analog converter, a left front loudspeaker, a right front loudspeaker, a left rear loudspeaker and a right rear loudspeaker, wherein the first sound mixer is used for mixing signals of a left sound channel, a center channel and a mega bass sound channel so as to acquire a first sound channel signal; the second sound mixer is used for mixing signals of a right sound channel, the center sound channel and the mega bass sound channel so as to acquire a second sound channel signal, the third sound mixer is used for mixing signals of a left rear surround sound channel and the mega bass sound channel so as to acquire a third sound channel signal; the fourth sound mixer is used for mixing signals of a right rear surround sound channel and the mega bass sound channel so as to acquire a fourth sound channel signal; the digital and analog converter is used for respectively converting the first sound channel signal, the second sound channel signal, the third sound channel signal and the fourth sound channel signal into a first audio, a second audio, a third audio and a fourth audio; and the four loudspeakers are respectively used for playing the first audio to the fourth audio. By the system, cost is saved, surround sound effect is good and signal processing is simple and easy to realize.

Description

technical field [0001] The invention relates to the technical field of audio processing, in particular to a signal processing device and method for four-speaker virtual surround sound. Background technique [0002] The 5.1-channel surround sound effect has been widely used in cinemas and home theaters. The 5.1-channel includes five full-range channels of left front, center, right front, left surround, and right surround, and a subwoofer low-frequency channel. Surround sound effect. In the prior art, at least 6 loudspeakers are required to realize the 5.1-channel surround sound effect according to international standards. The disadvantage of this method is that on the one hand, more loudspeakers and complicated power amplifier circuits are required, and the cost is relatively expensive; Many, limited by space conditions, cannot be popularized in some occasions, for example, only a few high-end cars are used in automobiles. [0003] In view of the above-mentioned shortcoming...

AI Technical Summary

Problems solved by technology

In the prior art, at least 6 loudspeakers are required to realize the 5.1-channel surround sound effect according to international standards. The disadvantage of this method is that on the one hand, more loudspeakers and complicated power amplifier circuits are required, and the cost is relatively expensive; Many, limited by space conditions, cannot be popularized in some occasions, for example, only a few high-end cars are used in cars

[0003] In view of the above-mentioned shortcomings, the prior art has a virtual retransmission that realizes 5.1-channel surround sound through fewer loudspeakers, such as Dolby virtual surround sound, SRS (Sound Retrieval System audio restoration system), Qsurround (a virtual surround sound developed by QSound Company) Sound), etc., the disadvantage of these technologies is that the listening area is narrow, only suitable for personal computers, TVs and earphones, etc., not suitable for automotive environments

[0004] At the same time, some 5.1 virtual retransmission technologies do not use the rear speakers in order to save resources, but use the virtual sound image of the front speakers. As a result, only the front 180° sound image can be realized, and the real 5.1 surround effect is worse than the audition effect. , no 360° surround sound effect

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