Method and system for directional sound transmission

Abstract

The disclosure discloses a method and system for directional sound transmission, which acquires position data where audible sounds are generated in a designated space, completes the spatial configuration of loudspeakers in the designated space, and forms a sound field convergence area; obtains target audible sound signal, perform filter processing and carrier modulation on the target audible sound signal after integral processing, and obtain a sound signal that can be emitted; send the sound signal that can be emitted to the speaker, and complete self-demodulation in the sound field convergence area to realize directional emission of sound . Use loudspeaker arrays in different positions to achieve the purpose of focusing the sound field, improve the emission efficiency and the energy of the audible sound; filter the signals outside the audible sound bandwidth in the envelope signal, and filter out weak signals that cannot be physically realized in the frequency domain Component, while subtracting the carrier component, reduces distortion and improves transmission efficiency.

Description

technical field [0001] The present disclosure relates to the field of electronic technology, and in particular, to a sound directional transmission method and system. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art. [0003] The directional propagation of sound waves (20Hz-20kHz) can be realized by directional transducers or transducer arrays. The maximum dimension of the transducer’s radiation surface and the wavelength of the emitted sound waves determine the size of the directional opening angle of the emitted sound beams. , that is, the larger the size of the transducer, the higher the frequency of the sound wave, the better the directivity, and the better the effect of directional sound transmission. However, the speaker size required to achieve directional sound transmission within the audible range is large, and the beam The opening angle i...

AI Technical Summary

Problems solved by technology

[0005] The design of the transmission waveform in the existing audio frequency directional technology has the problem of low conversion efficiency of ultrasonic waves to low-frequency audible sound, and the required loudspeaker transmission signal power is particularly strong to obtain the required audible sound

In addition, the audible sound signal obtained by the prior art method has less distortion for single-frequency signal, but for the sound signal containing multiple frequencies or continuous spectrum in the actual audible sound, there are different degrees of distortion in terms of amplitude, frequency, phase, etc. distortion

[0006] In summary, the directional sound transmission realized by the parametric array in nonlinear acoustics has the following problems: due to the low conversion efficiency of ultrasonic waves to difference frequency audible sound, the requirements for the transmitting power of the transducer are high; There is distortion in the generated difference frequency audible sound, and there is a large distortion between the actual required sound

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