Please select the most similar patent number from A, B, C and D. Which number is?
A method for measuring an acoustic parameter of a closed small space. The method comprises the following steps: S1, modeling a sound field by using a finite element method; S2, estimating a sound field distribution in the closed small space; S3, selecting a corresponding microphone and a corresponding loudspeaker, and arranging the microphone and the loudspeaker according to the sound field distribution; and S4, the loudspeaker playing a swept sine signal, receiving a sound signal by using the microphone that matches the loudspeaker, and measuring a spatial response function of a target point location. By means of modelling a sound field in a closed small space and accurately measuring an acoustic parameter thereof, support is provided for research and development of technology related to acoustics in a closed small space.
A: Disclosed are a data processing method and an AR device, for acquiring, by means of an acoustic method, layout structure information of an environment where the AR device is located. The method of the embodiments of the present invention comprises: performing digital-to-analog conversion on a prestored first digital signal to obtain an analog test signal, and controlling a loudspeaker on an AR device so that same plays a sound wave corresponding to the analog test signal; then, acquiring, by means of a microphone on the AR device, an analog feedback signal corresponding to a feedback sound wave from the sound wave after same is propagated, and performing analog-to-digital conversion on the analog feedback signal to obtain a second digital signal; and finally determining a propagation distance of the sound wave according to the first digital signal and the second digital signal, and further determining, according to the propagation distance, layout structure information of an environment where the AR device is located. In the embodiments of the present application, an AR device obtains layout structure information only by using a loudspeaker and a microphone on the AR device, and does not rely on the intensity of indoor light rays and a visual size, having a wide range of usage scenarios.
B: A gesture motion determination method and apparatus, an electronic device and a storage medium. The method comprises: acquiring an original audio signal, the original audio signal comprising an original ultrasonic signal and an original voice signal (101); acquiring nonlinear parameters of a loudspeaker (102); performing predistortion processing on the original audio signal according to the nonlinear parameters of the loudspeaker to obtain a predistortion signal, the predistortion signal being transmitted to the loudspeaker, the loudspeaker playing back same to generate a target output signal, and the target output signal being collected by a microphone after being transmitted by a spatial medium (103); acquiring a collected signal collected by the microphone (104); and determining whether a gesture motion exists according to the spectrum characteristics of the original ultrasonic signal and the collected signal (105). The invention can solve the problem of intermodulation distortion when using ultrasonic signals for gesture determination processing, and significantly improve the determination accuracy when using a loudspeaker to perform ultrasonic ranging and related applications in an apparatus.
C: Disclosed is a distributed voice control system comprising a main body portion (1) and at least two auxiliary portions (2). The main body portion (1) is provided with a master processor (10); a master microphone array (13) connected to the master processor (10) and used for acquiring acoustic signals of a user within the range of a first set distance; and a master loudspeaker (14) connected to the master processor (10) and used for playing a voice message. The at least two auxiliary portions (2) are distributed in different spatial positions, wherein each of the auxiliary portions (2) is in wireless signal connection with the main body portion (1) in a wireless manner, and each of the auxiliary portions (2) is provided with a sub-processor (20), a sub-microphone array (23) connected to the sub-processor (20) and used for capturing acoustic signals within the range of a second set distance, and a sub-loudspeaker (24) connected to the sub-processor (20) and used for playing a voice message. By means of the technical solution above, a distributed system is provided for better capturing and identifying acoustic information at different positions within a spatial range, this being beneficial to the improvement in user experience.
D: Disclosed is a space radiation sound field acquisition method based on near-field transformation, comprising: firstly, obtaining sound field distribution pM(x0, y0, z0) on a space V0 for a non-directional sound source placed at a point M to be measured in space; secondly, providing a transmitting-receiving combined transducer array L at a near-field position of the space V0, and enabling L to generate sound waves under the action of a weight coefficient function q(xL, yL, zL) to obtain sound field distribution pL(x0, y0, z0) in the space V0; then, adjusting the weight coefficient function q(xL, yL, zL) to make pL(x0, y0, z0)=pM(x0, y0, z0), and ∀(x0, y0, z0)∈V0; and finally, putting any sound source to be measured into the space V0, and using the weight coefficient function q(xL, yL, zL) to weight a sound radiation signal received by the transmitting-receiving combined transducer L, to obtain a radiation sound field of the sound source at M, thereby completing prediction. According to the acquisition method used in the present invention, the sound source at any point in space can be measured and calculated without the need for geometric information of sound source appearance, and therefore, the method is high in accuracy and low in error, and is suitable for non-free-field conditions.
Answer: D