Frequency response equalization processing method for omnidirectional sound source loudspeaker system

Abstract

The invention discloses a frequency response equalization processing method for an omnidirectional sound source loudspeaker system. The method comprises the following steps that: (1) a band-pass filter is designed, and the upper cutoff frequency and the lower cutoff frequency of the band-pass filter are respectively the upper limit and the low limit of the working frequency range of the loudspeaker system; (2) electroacoustical measurement is conducted to the loudspeaker system requiring frequency response equalization to obtain the amplitude frequency response of the loudspeaker system, and the peak and the valley of the amplitude frequency response are analyzed to obtain central frequency, Q value and gain or attenuation respectively corresponding to the 'peak' and the 'valley'; (3) corresponding peak-and-valley inversed equalizer is designed and parameters required by the frequency response equalization are determined according to the analysis result at the step (2), parameters required by the equalizer are finally determined and the equalizer is used to conduct 'peak cutting and valley adding' to signals processed at the step (1); and (4) an equalization system formed by the filter and the equalizer connected in series is obtained and is connected between a signal source and a power amplifier. Thereby, the frequency response is smooth and the amplitude variation of the adjacent frequency bands is mild and equalized.

Description

technical field [0001] The invention relates to the technical fields of electroacoustics and architectural acoustics. In particular, it relates to a frequency response equalization processing method of an omnidirectional sound source loudspeaker system (also known as an omnidirectional sound source, omnidirectional sound source). Background technique [0002] In architectural acoustics and noise testing, the omnidirectional sound source speaker system is used as the test sound source, and its ability to radiate sound to all directions of the space is required to be consistent (omnidirectional), and it must be relatively flat in the frequency range of interest in the test. frequency response. [0003] In the process of using the omnidirectional sound source speaker system, it is found that the existing omnidirectional sound source speaker system cannot meet the standards of ISO 3382-1997, ISO 140-3, GB19889.3, and GB 19889.5. The frequency response requirements of the gener...

AI Technical Summary

Problems solved by technology

By improving the box structure and replacing higher-quality speaker units, the peak-to-valley amplitude of the frequency response curve of the omnidirectional speaker sound source system within its effective frequency range can be reduced, and its frequency response defects can be improved. However, if we start from these two aspects, Since the omnidirectional sound source speaker system is generally a special box with a dodecahedron, its theoretical calculation and computer simulation are relatively complicated, and to a certain extent, it is difficult to continue to improve the frequency response and the cost performance is low.

[0004] In China, there is no public literature on the equalization method of the omnidirectional sound source speaker system. Although there are patents on the omnidirectional (non-directional) speaker system, most of the disclosed directional speaker systems are omnidirectional (non-directional) in the horizontal plane. non-directional), rather than omni-directional in three-dimensional space, and not for architectural acoustics and noise testing

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