Channel balance and sound field control method and device of digitalized speaker system

Abstract

The invention discloses a channel balance and sound field control method and device of a digitalized speaker system on the basis of a single generalized encoder. The method comprises the following steps of: (1), digital format conversion; (2) multi-channel balance processing; (3) sound field control processing; (4) serial-parallel conversion processing; (5) generalized encoding processing; (6) extraction selecting processing; (7) serial-parallel conversion processing; and (8) power amplification of digital signals of all channels, and driving of sound production of a digitalized speaker load. The device comprises a sound source, a digital format converter, a channel balancer, a sound field controller, a serial-parallel converter, a generalized encoder, an extraction selector, a serial-parallel converter, a multi-channel digital power amplifier and the digitalized speaker load; and all the units are connected in sequence. According to the method and device disclosed by the invention, volume, power consumption, cost and hardware implementation resources of the system are reduced, the electroacoustic conversion efficiency and the anti-jamming capability of the system are enhanced, and the inband frequency response plainness degree and the sound field control capability of the system are increased.

Description

technical field [0001] The invention relates to a method and device for channel equalization and sound field control, in particular to a method and device for channel equalization and sound field control of a digital loudspeaker system based on a single generalized encoder. [0002] Background technique [0003] With the rapid development of large-scale integrated circuits and digital industries, the digitization trend of the electro-acoustic industry is becoming more and more obvious. At present, the digitization process of the speaker system has advanced to the digital power amplifier, but the digitization of the speaker unit is still a bottleneck problem. In order to break through the digitization of the speaker unit itself, in recent years, many scholars have begun to study the digital speaker system based on Σ-Δ modulation technology. In this digital loudspeaker system, the signal transmitted by each channel is a digital signal based on a binary state coding format. Th...

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Problems solved by technology

Chinese patent CN 101803401A discloses a channel deviation correction method for a digital loudspeaker system based on mismatch shaping, but this patent does not consider the effective equalization of the frequency response fluctuations in the audio band of each channel, resulting in the system restoration signal spectrum and There is a large deviation in the real frequency spectrum of the sound source signal, so that the digital system playback sound field cannot truly reproduce the real sound field effect of the original sound source

The electroacoustic conversion device used in the digital loudspeaker system is a digital loudspeaker array or a multi-voice coil speaker, but due to the limitation of the current processing level, these electroacoustic conversion devices involve multiple speaker units or multiple voice coils. There is a very large frequency response difference among them, relying solely on mismatch shaping technology cannot solve the problem of correcting large frequency response differences well, so it is necessary to find a multi-channel frequency response suitable for digital speaker systems with better performance Consistency and flatness correction method

[0005] At present, the sound field control method adopted by the digital loudspeaker system is a relatively simple channel delay control method. This method is only suitable for the directivity control of a single beam of a digital system in an ideal free sound field environment. In some applications, when it is required When the digital system generates multiple directional beams, this method based on delay control will not be able to complete the steering control of multiple beams

In common applications, the sound field environment where the digital system is located will have some reflection or scattering effects, resulting in relatively abundant multipath interference components. In this case, the method based on delay control will not be able to obtain the correct sound field control effect

For complex sound field control requirements, relying solely on delay control cannot achieve good control effects, and it is necessary to jointly control the amplitude and phase responses of multiple channels to achieve the desired sound effect requirements

The digital system beam steering method based on channel delay adjustment disclosed in Chinese patent CN 101803401A only adjusts the phase information of the transmission signal of each channel, and does not consider the amplitude adjustment of the transmission signal of each channel, which belongs to a relatively simple sound field control method. The beam control ability produced by it is weak, and it only has certain beam steering ability in the environment close to the free field

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