15 results about "Parametric array" patented technology

The utility model provides a transducer for a pressure-resistant deep sea high frequency parametric array, which comprises a piezoelectric vibrator parametric array, a negative electrode layer, a positive electrode layer, a backing, a matching layer, a shell and a watertight layer, the size of piezoelectric vibrators is determined, the piezoelectric vibrator parametric array is formed by a plurality of piezoelectric vibrators which are arranged in an array at equal intervals, and the piezoelectric vibrator parametric array is formed by a plurality of piezoelectric vibrators which are arranged in an array at equal intervals. The anodes and the cathodes of all the piezoelectric vibrators are connected in parallel through conductive films, and an anode wire and a cathode wire are led out; a back lining is made of a high-pressure-resistant foam material, and one side of the back lining is bonded to a positive electrode layer of the piezoelectric vibrator parametric array; and shell assembling is conducted, and matching layer pouring and watertight layer pouring are conducted. Compared with the prior art, the transducer has the capability of directly working in a 6000m deep sea environment while having excellent acoustic performance, and the pressure-resistant deep sea high-frequency parametric array is simple in manufacturing process, good in consistency and suitable for large-scale manufacturing.

The application discloses a kind of parametric array loudspeaker nonlinear distortion modeling and compensation method based on deep learning.The specific steps are as follows:(1) record the audio sound signal and its input signal of parametric array loudspeaker system output at the listening position where nonlinear distortion needs to be suppressed, and prepare the data set for modeling;(2) use neural network F to model the whole parametric array loudspeaker system, train neural network F using the data set;And using FIR filter model F lin Model the linear part of the system;(3) use trained neural network F and model F lin Train neural network G as the inverse filter of the system;(4) input the audio signal expected to be played into parametric array loudspeaker system after pre-processing by neural network G, to realize compensation for the nonlinear of the system.The method of the application can accurately model and effectively compensate the nonlinear distortion of parametric array loudspeaker, and significantly suppress the nonlinear distortion of parametric array loudspeaker.

The application provides a signal processing method, device, equipment, system, storage medium and program product. The input signal is adjusted based on an audible signal output by the input signal until the difference between the audible signal output and the expected signal is within a preset difference range. Then, the input signal corresponding to the audible signal within the preset range is input to the parametric array loudspeaker as the signal, which is less affected by environmental noise and improves the distortion compensation effect.

The invention discloses a near-field sound focusing and directivity control system of a multichannel parametric array loudspeaker, which comprises a signal source module, a signal adjusting module, a signal modulation module, a signal amplification module and a parametric array loudspeaker, and is characterized in that the signal source module generates an original audio signal, the signal adjusting module adjusts the original audio signal, and the signal amplification module amplifies the original audio signal; the multi-channel focusing audio signal generation module generates multi-channel focusing audio signals, the signal modulation module modulates the multi-channel focusing audio signals to ultrasonic carrier signals to generate multi-channel ultrasonic modulation signals, and the signal amplification module carries out power amplification on the ultrasonic modulation signals and then correspondingly outputs the ultrasonic modulation signals to a plurality of sound production channels of the parametric array loudspeaker. And driving the plurality of sounding channels to focus and sound to the focus. The invention provides a near-field sound focusing control scheme of a parametric array loudspeaker, which is suitable for near-field focusing of the parametric array loudspeaker with large channel spacing and has a better side lobe suppression effect.

The application discloses a parametric array loudspeaker and a sound field moving system, wherein the parametric array loudspeaker comprises an ultrasonic transducer array, the ultrasonic transducer array comprises a plurality of sound emission channels (1) which are arranged at intervals along a first direction, each of the sound emission channels (1) comprises at least one ultrasonic transducer (2), each of the sound emission channels (1) is independently controlled, and in operation, part of the sound emission channels (1) emit sound and part of the sound emission channels (1) do not emit sound to form a moving sound field by controlling the sound emission channels (1). The parametric array loudspeaker and the sound field moving system can realize sound field moving.

The invention discloses a near-field sound focusing and directivity control method for a multichannel parametric array loudspeaker, and the method comprises the steps: S1, carrying out the signal adjustment of an original audio signal, and generating a plurality of channels of focusing audio signals for focusing; s2, modulating the focusing audio signal of each channel to an ultrasonic carrier signal to generate a plurality of focusing audio signals; s3, performing power amplification on the ultrasonic modulation signal of each channel; and S4, correspondingly driving a plurality of sound production channels of the parametric array loudspeaker by adopting the ultrasonic modulation signals of the plurality of channels subjected to power amplification, so that the plurality of sound production channels focus and produce sound towards a focus in a near field, and the distance between two adjacent sound production channels of the parametric array loudspeaker is smaller than or equal to the wavelength of the audio signal. The invention provides a near-field sound focusing control scheme of a parametric array loudspeaker, which is suitable for near-field focusing of the parametric array loudspeaker with large channel spacing and has a better side lobe suppression effect.

The invention relates to the technical field of voice information security, and discloses a recording interference prevention method and device, and the method comprises an environment perception step, an equipment recognition and positioning step, an interference strategy decision-making step, a dynamic sequence generation step, a signal fusion construction step, a parametric array modulation step, a directional emission step, and an evaluation adjustment step. The device corresponds to the method. According to the application, different recording devices are accurately distinguished through an acoustic fingerprint identification technology, and a targeted interference strategy can be generated according to specific acoustic features of the devices; by combining an acoustic parametric array and a beam forming technology, accurate directional transmission of interference sound waves is realized, interference energy is enabled to act on target equipment in a concentrated manner, and the interference efficiency is improved; through fusion of multiple dynamic sequences and construction of composite baseband signals, the unpredictability and anti-filtering capability of interference signals are enhanced. Therefore, the high-efficiency interference performance is maintained, the influence on normal voice communication is reduced, and accurate and self-adaptive anti-recording protection is realized.

The application provides a high-integration multifunctional underwater acoustic transducer in the technical field of underwater acoustic transducers, which comprises a multi-beam parametric array, a multi-beam depth transducer array, a pressure-resistant substrate and a metal plate, the multi-beam parametric array and the multi-beam depth transducer array are connected to the pressure-resistant substrate respectively, the pressure-resistant substrate is connected to the metal plate, and the lead-out wires of the multi-beam parametric array and the multi-beam depth transducer array are led out from the metal plate; the multi-beam parametric array comprises a large-area transmitting array and a multi-channel receiving transducer array; and the multi-beam depth transducer array comprises a first linear array transmitting array, a multi-channel linear array receiving array and a second linear array transmitting array. The multi-beam parametric array and the multi-beam depth transducer array are integrated, shallow bottom layer and topography detection can be simultaneously realized, and a sonar transducer with small volume and light weight can realize high-resolution imaging of underwater or seabed.

The invention belongs to the technical field of nonlinear acoustics and active noise control, and particularly relates to an underwater active noise control method, program and equipment adopting a virtual sensing and parameter emission technology, and a storage medium. According to the method, the auxiliary filter absorbs the information of the optimal error in the training stage to form the virtual error estimator, in the noise control process of the target noise source, an error hydrophone does not need to be arranged, signals collected by the auxiliary hydrophone are constructed into virtual error signals through the trained auxiliary filter, and the target noise source is subjected to noise control through the virtual error signals. And updating the auxiliary filter by taking the virtual error signal as a cost function, and adjusting a transmitting signal of the transmitting transducer according to the output of the updated auxiliary filter. According to the method, errors are estimated in real time through virtual sensing and closed-loop control is conducted, meanwhile, the parametric array serves as a secondary sound source, interference to the surrounding environment is reduced by means of the efficient effect of the high directivity of the parametric array in a target area, and meanwhile the low-frequency applicability is improved.

The invention discloses an isolation structure for reducing acoustic crosstalk of a parametric array loudspeaker to a microphone, the isolation structure comprises a bottom plate and a plurality of sound isolation units located on the bottom plate, the plurality of sound isolation units are arranged around the microphone on the bottom plate, each sound isolation unit comprises a support body and a plurality of sound isolation parts, each sound isolation part is arranged at the edge of the support body, and each sound isolation part is arranged on the bottom plate. The plurality of sound barrier parts are circumferentially distributed at intervals along the edge of the supporting body, a notch is formed between every two adjacent sound barrier parts, and a sound barrier cavity communicated with the notch is formed between every two adjacent sound barrier parts and the supporting body; the isolation structure isolates the parametric array loudspeaker and the microphone, and the sounding surface of the parametric array loudspeaker is not opposite to the pickup surface of the microphone. According to the novel acoustic isolation structure for isolating the parametric array loudspeaker from the microphone, propagation of sound waves matched with the ultrasonic carrier frequency of the parametric array loudspeaker can be greatly inhibited, and the influence on target audible sound is extremely small.

A technique for accurately measuring acoustic characteristics of a parametric array is provided. A first calculation unit that calculates a complex amplitude d of an optical phase at a frequency fd from an amount of change φs of the optical phase caused by demodulated sound S, assuming that qdiff(ξ′, η′) is a function defined using a Gaussian beam expansion method, a second calculation unit that calculates a function value qdiff(ξ, η) at a point X and a line integral value ∫Lqdiff(ξ′, η)dξ′ of the function qdiff(ξ′, η) along the optical path L, and a third calculation unit that calculates a complex amplitude p of the demodulated sound with the frequency fd at the point X using the complex amplitude d, the function value qdiff(ξ, η), and the line integral value ∫Lqdiff(ξ′, η)dξ′ are included.

This application discloses a voice assistance system based on phased array focusing, its manufacturing method, and its usage method, relating to the field of voice-assisted speaking technology. The system includes: a glottal pulse modulator, a phased array drive control system, and an acoustic parametric array; the glottal pulse modulator is used to modulate the original vocal glottal wave signal with a carrier signal that excites an ultrasonic transducer to obtain a modulated signal; the acoustic parametric array includes several ultrasonic transducers; the transmission phase of each ultrasonic transducer is set to the ultrasonic phase emitted by the virtual sound source it receives; the virtual sound source is located at the focusing position; the phased array drive control system is used to control the transmission phase of each ultrasonic transducer when emitting the modulated signal. This application controls the transmission phase of each ultrasonic transducer to the ultrasonic phase emitted by the virtual sound source located at the focusing position, thereby enabling the information emitted by these ultrasonic transducers to be focused at that focusing position.

The invention discloses a directional sound wave expelling and soft killing system and method based on bridge defense, and belongs to the technical field of bridge safety protection. The system comprises four subsystems including a low-altitude bridge floor sensing and detecting system, a bridge pier sensing and detecting system, a grading disposal defense system and an intelligent regulation and control system, and mainly comprises equipment such as a laser radar, an infrared tracking device, a parametric array directional sound wave emitter, a sonar device and a vibration sensing device. The system is based on deep reinforcement learning, can detect multi-element threats such as an unmanned aerial vehicle and an underwater vehicle in an all-weather manner and implement hierarchical non-lethal response, aims to solve the problems of sensing blind areas, passive response, large incidental damage and the like existing in traditional bridge defense, and is high in safety and reliability through various technologies such as omnibearing multi-mode sensing and hierarchical response. And intelligent, precise and non-fatal active defense is realized. The method has the advantages of being efficient, durable, environmentally friendly and easy to deploy and maintain, and safe and stable operation of key infrastructures such as bridges in the complex combat environment can be effectively guaranteed.

This invention belongs to the field of nonlinear acoustics technology, specifically relating to a method, program, equipment, and storage medium for calibrating the amplitude and phase consistency of parametric arrays. This invention determines and compensates for the difference-frequency amplitude and phase response of the high-frequency acoustic waves emitted by each array element, thereby enabling the calibration of the amplitude and phase consistency of parametric arrays in various experimental scenarios such as water tanks and anechoic chambers. This invention exhibits high robustness to installation errors, and the calibrated array elements possess a more consistent difference-frequency amplitude and phase response. The invention has a simple implementation, is applicable to various experimental scenarios, and provides necessary pre-calibration for beamforming of parametric arrays, possessing high application value.

The utility model discloses a multichannel audio test system, which comprises an audio analyzer, a multichannel switching unit, a plurality of sound production units and a plurality of pickup units, audio signals are output to the sound production units of corresponding channels one by one through the multichannel switching unit, the sound production units are driven to produce sound, and the sound is picked up by the corresponding pickup units. And the pickup units output sound signals obtained through pickup to the audio analyzer, so that performance testing of the plurality of sound production units and / or the plurality of pickup units is realized. According to the utility model, the test efficiency and the test precision of the multi-channel audio test are improved, and the multi-channel test requirements of a loudspeaker array, a parametric array loudspeaker array, a microphone array and the like are met.