5 results about "Source level" patented technology

The invention discloses a reinforcement learning-based cross-sea-air transmission parameter intelligent decision-making method and related equipment, and relates to the technical field of cross-sea-air communication, in the invention, a cross-sea-air channel model is constructed, and the cross-sea-air channel model is used as a dynamic environment of reinforcement learning, so that the cross-sea-air transmission parameter intelligent decision-making method is realized. Reinforcement learning is adopted to replace expert rules to intelligently decide cross-sea-air transmission parameters according to environmental changes, and the communication performance of the system is improved; environment rewards, action mapping and cross-sea-air channel states are integrated into experience to be stored in an experience playback pool, intelligent agents are trained through the experience in the experience playback pool, cross-sea-air optimal transmission parameter strategies are output through the trained intelligent agents, multi-parameter joint decisions of a modulation mode, a coding mode and a transmitting sound source level are achieved, and the multi-parameter joint decisions of the multi-parameter joint decisions of the multi-parameter joint decisions of the multi-parameter joint decisions of the multi-parameter joint decisions of the multi-parameter joint decisions are obtained. And the adaptive management and decision-making capability of the cross-sea-air communication system is improved.

A method for generating low-frequency limited acoustic beams in a well, the method comprising: determining a transducer aperture according to a downhole borehole size, calculating a nonlinear action region of a radiated acoustic field based on the transducer aperture and a distance parameter; selecting a sound source design modulation theory model according to the nonlinear action region, determining sound source parameters of the transducer based on the sound source design modulation theory model and the transducer aperture; carrying out nonlinear radiated acoustic field simulation according to the sound source parameters, determining a critical propagation distance corresponding to a maximum value of a difference frequency sound source level, and extracting nonlinear acoustic wave signal characteristics at the distance, generating a loadable modulation signal based on the characteristics; measuring and comparing signal characteristics of the transducer under a loadable modulation signal loading state and under a natural radiated modulation signal loading state, and determining the loadable modulation signal with a larger difference frequency sound source level. The present application can generate nonlinear acoustic wave signals containing larger low-frequency components at a smaller radiated distance, and the difference frequency conversion efficiency of the generated nonlinear radiated signals is high.

This invention discloses a method for determining the sound source level of an underwater moving target based on the characteristics of cross-noise curves measured by dual hydrophones. The method includes the following steps: S1, acquiring the motion noise signal of the underwater target; S2, processing the acquired noise signal and calculating the motion noise curve of the target within a specified frequency band; S3, calculating the difference between the peak values ​​of the cross-noise curves and the time difference between corresponding peak values ​​based on the acquired motion noise curves of the target; S4, calculating the radiated noise frequency band sound source level and radiated noise spectral source level of the target under the corresponding motion condition based on the acquired sound field and noise information. This invention can reduce the influence of distance measurement on noise measurement results, and the simplified measurement system improves the operability of the method.

The present application relates to a kind of wideband marine ambient noise numerical simulation methods in horizontal layered medium, comprising the following steps, step one: according to the environmental information of target sea area, set marine environmental parameter, calculate the spatial correlation function of marine ambient noise in horizontal layered medium;Step two: using the sea surface noise source level empirical formula of wind-generated noise and the spatial correlation function of wind-generated noise to calculate noise intensity;Step three: the spatial correlation function of marine ambient noise is normalized, obtains the spatial correlation coefficient of marine ambient noise.The present application can effectively solve the problem of marine ambient noise numerical simulation in horizontal layered medium, and provide more real environmental noise for sonar system design and simulation.

The invention discloses a source level independent recording system based on OBS, and relates to the technical field of computer multimedia. Comprising the following core implementation steps: step S100, building a filter architecture: creating a user-defined filter which can be attached to any OBS source, and creating an independent view and video rendering pipeline for each target source through the filter, so that the rendering process of each source is independent of scene synthesis logic; a user-defined filter framework capable of being attached to any OBS source is built, an independent view and video rendering pipeline is created for each target source, audio and video separation and capture are achieved in combination with a filter callback function and an audio callback function, independent encoders are distributed to all the sources, and a multi-encoder concurrent thread safety mechanism is established. The problems that traditional OBS recording depends on scene synthesis logic, a single source cannot be accurately and independently recorded, mutual interference, data loss or coding abnormity are easily caused during multi-source recording, and audio and video synchronism and integrity are difficult to guarantee are solved.