Sound field parameter obtaining method based on compressed sensing

Abstract

The invention relates to a sound field parameter obtaining method based on compressed sensing, and belongs to the technical field of digital signal processing. The sound field parameter obtaining method relates to a ball-type microphone array module, a constant observation matrix generation module, an observation signal vector generation module, an orthogonal basis construction module, a random observation matrix generation module, a ball harmonic wave basis coefficient reconstruction module and an object region sound pressure distribution reconstruction module. In a ball-type microphone array design determining module, the realizability and the array miniaturization are considered, and the ball-type microphone array radius is manually determined. Ball harmonic wave basis parameters have the sparsity under the determined ball-type radius, therefore, an orthogonal basis and a random observation matrix are constructed in the orthogonal basis construction module and the random observation matrix generation module respectively according to the compressed sensing theory, meanwhile, the orthogonal basis and the random observation matrix are input into the ball harmonic wave basis coefficient reconstruction module, the ball harmonic wave basis coefficients are reconstructed, and finally the ball harmonic wave basis coefficients are input into the object region sound pressure distribution reconstruction module to enable object region sound pressure distribution to be reconstructed.

Description

technical field [0001] The invention relates to a sound field parameter acquisition method based on compressed sensing, which belongs to the technical field of digital signal processing. Background technique [0002] Three-dimensional audio reproduction is to produce a sound field that can bring real and natural feelings to the audience, and it has a wide range of applications in many fields such as communication, digital entertainment, and human-computer interaction. Let me talk about the meaning and application fields of sound field reproduction here. The ambisonics method is one of the technologies that can physically reproduce a three-dimensional audio sound field, which was originally proposed by Gerzon and used for two-dimensional sound field reproduction. The basic idea of ​​the ambisonics method is to represent the sound field as a linear combination of circular harmonics. In recent years, with the development of technology, spherical harmonic decomposition is ofte...

AI Technical Summary

Problems solved by technology

This technology uses as few microphones as possible to collect sound field information under the Euclid norm criterion, but as the sound field order N increases, the number of microphones required increases. Although the accuracy of the collected signals can reach a high level, so many microphones still distort the original soundstage

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