Sound directional transmission method and system

Abstract

The invention discloses a sound directional transmission method and system, and the method comprises the steps: obtaining the position data of audible sound generated in a specified space, completingthe spatial configuration of a loudspeaker in the specified space, and forming a sound field convergence region; obtaining a target audible sound signal, and carrying out filtering processing and carrier modulation on the target audible sound signal after integration processing to obtain an emittable sound signal; and sending the sound signal capable of being emitted to a loudspeaker, completing self-demodulation in a sound field convergence area, and realizing directional emission of sound. The loudspeaker arrays at different positions are utilized to achieve the purpose of sound field focusing, and the transmitting efficiency and the audible sound energy are improved; the signals except the audible sound bandwidth in the envelope signals are filtered, weak signal components which cannotbe physically realized are filtered in the frequency domain, and meanwhile, carrier components are subtracted, so that distortion is reduced, and the transmitting efficiency is improved.

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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