1.
Audio directional loudspeaker is a novel loudspeaker which can generate an audio signal with high directivity by utilizing the parametric array principle.
声频定向扬声器是利用参量阵原理，产生高指向性声频信号的新一代扬声器。
2.
Design Optimization and Character Research of Piezoelectric Micromachined Ultrasonic Transducer for Directional Loudspeaker Based on FEA
基于有限元方法的声频定向微型压电超声传感器结构优化及特性研究
3.
directional frequency characteristic of microphone
传声器指向性频率特
4.
directional frequency response of microphone
传声器指向性频率响应
5.
The higher the acoustic frequency is, the stronger its directivity is.
而且所有声频均有指向性,声频愈高,指向性愈强。
6.
Design and Implementation of Low-power Audio Signal Acquisition System for Acoustic Location
面向声定位的低功耗音频信号采集系统的设计与实现
7.
underwater emission-and direction frequencies
水下发射和定向频率
8.
Suppose the speakers both emit a pure sinusoidal sound wave of constant frequency.
假定两个扬声器都发射恒定频率的纯正弦声波。
9.
Longitudinal acoustic phonon hardening in two-dimensional ferromagnetic system
二维铁磁系统的纵向声频支声子的硬化
10.
Modulation-Free Laser Frequency Locking by AOM Shifted Cesium Sub-Doppler Spectra
声光偏频亚多普勒光谱无调制激光频率锁定
11.
A METHOD OF NOISE DATA PROCESSING IN FREQUENCY DOMAIN CALIBRATION FOR VERY BROADBAND SEISMOMETER
甚宽频带地震计频域标定的噪声数据处理方法
12.
Direction Estimation Algorithm and Its Improved Algorithm Based on Vector Sound Intensity Array
声强向量阵对低频目标测向及其优化算法研究
13.
directional radio sonobuoy
定向无线电声纳浮标
14.
Determination of Direction and Range
定向与测距装置(超声波)
15.
Measurement of audio-frequency noise voltage level in sound broadcasting
GB/T17147-1997声音广播中音频噪声电平的测定
16.
The Research on Analysis and Mesurement in Frequency and Acoustic Field of Water-Logging Ultrasonic Probe
水浸超声探头频率、声场特性的分析及测定研究
17.
In the equivalent electrical network the acoustical mass of acoustic leaks is very important for impedance over the range from 250 to 1000Hz under the leakage conditions.
在250～1000赫频段内,声阻抗主要由它决定。
18.
A broad-band constant beamwidth method for circular multi-element array
多基元宽频带恒定束宽圆弧形声基阵