CN-122027951-A - Audio processing method and system based on ultrasonic excitation passive far-end node

CN122027951ACN 122027951 ACN122027951 ACN 122027951ACN-122027951-A

Abstract

The invention provides an audio processing method and system based on an ultrasonic excitation passive far-end node, wherein the audio processing system comprises an audio transmitting device and at least one passive far-end node, the audio transmitting device comprises a plurality of ultrasonic transducers, the audio transmitting device determines a target passive far-end node, generates at least two beams of target ultrasonic signals based on baseband audio signals, transmits the at least two beams of target ultrasonic signals to the target passive far-end node, after the target ultrasonic signals are folded by an ultrasonic shaping layer of the target passive far-end node, the ultrasonic shaping layer of the target passive far-end node and a nonlinear enhancement layer of the target passive far-end node are intersected in an intersection area to generate audio signals corresponding to the baseband audio signals, and the audio signals are radiated to a listening area through an audio radiation layer of the target passive far-end node. The invention can reduce the leakage of audible sound on the propagation path and the propagation of the audio signal is stable.

Inventors

CHEN KAINAN
ZHAO SHUYANG
YU YUE
SUN XIAOLIANG
KONG LINGQI

Assignees

本相空间(珠海)科技有限公司

Dates

Publication Date: 20260512
Application Date: 20260415

Claims (8)

1. The audio processing method based on the ultrasonic excitation passive far-end node is applied to an audio processing system, the audio processing system comprises an audio transmitting device and at least one passive far-end node, the audio transmitting device comprises at least two ultrasonic transducers, and the passive far-end node is sequentially provided with an ultrasonic shaping layer, a nonlinear enhancement layer and an audio radiation layer along the incidence direction of ultrasonic waves; characterized in that the method comprises the following steps: The audio transmitting device determines a target passive far-end node and generates at least two beams of target ultrasonic signals based on a baseband audio signal; Transmitting at least two beams of target ultrasonic signals to the target passive remote node, wherein each target ultrasonic signal is transmitted by an ultrasonic transducer, the transmitting angles of the target ultrasonic signals are different, and the phase of each target ultrasonic signal accords with a preset superposition condition; After the target ultrasonic signal is folded by the ultrasonic shaping layer of the target passive far-end node, the ultrasonic shaping layer of the target passive far-end node and the nonlinear enhancement layer of the target passive far-end node are intersected in an intersection area to generate an audio signal corresponding to the baseband audio signal; The audio signal is radiated to a listening area through the audio radiation layer of the target passive remote node.
2. The method of audio processing based on ultrasonically excited passive remote nodes of claim 1, wherein: After the target ultrasonic signal generates the audio signal corresponding to the baseband audio signal, the method further comprises the following steps: The audio signal is transmitted through the nonlinear enhancement layer of the target passive remote node to the audio radiating layer of the target passive remote node.
3. The method of audio processing based on ultrasonically excited passive remote nodes according to claim 1 or 2, characterized in that: The step of generating at least two target ultrasonic signals based on the baseband audio signal to be output comprises: modulating the phase and/or emission angle of a plurality of said target ultrasonic signals according to a target passive remote node.
4. The method of audio processing based on ultrasonically excited passive remote nodes according to claim 1 or 2, characterized in that: A plurality of ultrasonic transducers are arranged at different positions of the audio transmitting device.
5. The ultrasonic excitation passive remote node based audio processing method of claim 4, wherein: Before the plurality of target ultrasonic signals reach the target passive remote node, further performing: Multiple beams of the target ultrasonic signals do not intersect.
6. The method of audio processing based on ultrasonically excited passive remote nodes according to claim 1 or 2, characterized in that: The step of the audio transmitting apparatus determining a target passive remote node comprises: The audio transmitting apparatus confirms the target passive remote node according to the frequency of the baseband audio signal.
7. The audio processing system comprises an audio transmitting device and at least one passive far-end node, wherein the audio transmitting device comprises at least two ultrasonic transducers, and the passive far-end node is sequentially provided with an ultrasonic shaping layer, a nonlinear enhancement layer and an audio radiation layer along the incidence direction of ultrasonic waves; the method is characterized in that: The audio transmitting device determines a target passive far-end node and generates at least two beams of target ultrasonic signals based on a baseband audio signal to be output; The audio transmitting device transmits at least two beams of target ultrasonic signals to the target passive far-end node, each target ultrasonic signal is transmitted by an ultrasonic transducer, the transmitting angles of the target ultrasonic signals are different, and the phase of each target ultrasonic signal accords with a preset superposition condition; After the target ultrasonic signal is folded by the ultrasonic shaping layer of the target passive far-end node, the ultrasonic shaping layer of the target passive far-end node and the nonlinear enhancement layer of the target passive far-end node are intersected in an intersection area to generate an audio signal corresponding to the baseband audio signal; The audio signal is radiated to a listening area through the audio radiation layer of the target passive remote node.
8. The audio processing system of claim 7, wherein: After the target ultrasonic signal generates the audio signal corresponding to the baseband audio signal, the method further comprises the following steps: the audio signal passes through the nonlinear enhancement layer and is transmitted to the audio radiation layer of the target passive remote node.

Description

Audio processing method and system based on ultrasonic excitation passive far-end node Technical Field The invention relates to the technical field of audio processing, in particular to an audio processing method and system based on an ultrasonic excitation passive far-end node. Background Current technology for achieving surround sound or spatial audio generally involves a first, multi-speaker surround system that requires a plurality of active speakers (e.g., left and right surround, back surround, sky channel, etc.) to be arranged around the listener, each speaker being responsible for outputting one or more independent channels. Such systems can provide accurate sound image localization and high fidelity, but must connect power and audio signal lines for each speaker, wiring is complex and affects indoor appearance. And a second, virtual surround and radiate scheme, which simulates a side or rear sound image by digital signal processing and beam forming through a sound bar or a multi-unit sound processing device, using wall or ceiling radiation of a room. This approach reduces the number of loudspeakers, but the sound field effect is severely dependent on room geometry, radiation material and listener position, and the sound image tends to drift or distort when the room shape is different or the listener moves. Third, ultrasonic parameter array technology, which modulates audio signals by using high-frequency ultrasonic as carrier wave and generates audible sound by second-order nonlinear self-demodulation of air. The mode emits one or more beams of broadband ultrasonic waves, and the nonlinear effect in the air enables the high-frequency signals to generate audio frequency difference frequency components so as to obtain audible sound with narrow directivity. But this technique is generally only used for directional propagation in a single direction and is not suitable for generating multiple independent sound source nodes in space. Fourth, radiation type ultrasonic field control is performed, in which ultrasonic beams are projected to a radiation surface (such as a wall or a plate) through an ultrasonic array, and the direction of the ultrasonic beams is adjusted by radiation. The existing method mainly changes the carrier wave propagation direction, but audible sound is gradually formed through self-demodulation in the ultrasonic propagation process, so that the sound is leaked in the propagation process. A virtual speaker apparatus has been known which includes a general audio speaker and a parametric speaker, wherein the parametric speaker emits ultrasonic waves, and wherein the parametric speaker emits ultrasonic waves at a position along a radiation surface by redirecting a parametric output to generate the virtual speaker in an omnidirectional form from the radiation surface and toward a spread of listeners. But the parametric speaker emits a single beam of ultrasonic waves to the radiation surface, and the radiation surface is used for changing the propagation direction of the ultrasonic waves to generate a virtual speaker, but the audible sound is gradually formed through self-demodulation in the ultrasonic propagation process, so that more audible sound leakage occurs in the propagation process. Disclosure of Invention It is a first object of the present invention to provide an audio processing method based on an ultrasonically excited passive remote node that reduces audible acoustic leakage. A second object of the present invention is to provide an audio processing system applying the above-mentioned audio processing method based on an ultrasonically excited passive remote node. The audio processing method based on the ultrasonic excitation passive far-end node is applied to an audio processing system, the audio processing system comprises an audio transmitting device and at least one passive far-end node, the audio transmitting device comprises at least two ultrasonic transducers, an ultrasonic shaping layer, a nonlinear enhancement layer and an audio radiation layer are sequentially arranged on the passive far-end node along the ultrasonic incidence direction, the audio transmitting device determines the target passive far-end node, generates at least two beams of target ultrasonic signals based on baseband audio signals to be output, transmits at least two beams of target ultrasonic signals to the target passive far-end node, each target ultrasonic signal is transmitted by one ultrasonic transducer, the transmission angles of the target ultrasonic signals are different, the phase of each target ultrasonic signal meets the preset superposition condition, after the target ultrasonic signals are folded by the ultrasonic shaping layer of the target passive far-end node, the ultrasonic shaping layer of the target passive far-end node and the nonlinear enhancement layer of the target passive far-end node are arranged in sequence, the audio signals corresponding to the baseband audio signals are