对于多通道参数阵列扬声器阵列的非线性声场控制方法
Yunxi Zhu1,2, Liwen Qin1,2, Wenyao Ma1,2
1Key Laboratory of Noise and Vibration Research, Institute of Acoustics, Chinese Academy of Sciences Beijing, 100190, People's Republic of China.
The Journal of the Acoustical Society of America
|February 7, 2025
概括
本研究介绍了对参数阵列扬声器 (PAL) 的非线性声场控制,以克服室内声学挑战. 新方法在复杂环境中提高了指导性和声音质量.
科学领域:
- 声学 声学 在声学方面
- 信号处理 信号处理
- 非线性声学 非线性声学
背景情况:
- 参数阵列扬声器 (PAL) 提供高定向性,但由于散射和反射,在室内环境中性能降低.
- 现有的线性声场控制方法对PAL无效,因为频道之间存在非线性合,正如Westervelt方程所描述的那样.
- 由于非线性声音转换效率低,PALs通常具有较低的辐射效率.
研究的目的:
- 提出一种新的框架,用于在复杂的声学环境中控制PAL的非线性声场.
- 开发一个声音控制算法,以提高PALs的辐射效率和声学对比度.
- 解决线性控制方法在管理PAL产生的非线性声音场的局限性.
主要方法:
- 基于韦斯特维尔特方程的非线性声场控制框架的开发.
- 设计一个两阶段的非凸优化算法,以最大限度地提高辐射效率和声学对比度.
- 利用模拟和实验验证来评估拟议的框架和算法.
主要成果:
- 拟议的非线性控制框架有效地操纵PALs在复杂的声学环境中产生的声场.
- 开发的算法成功地在黑暗区域抑制了不需要的可听声音,同时在明亮区域保留了所需的声音.
- 在现实场景中展示了增强的声学对比度和改善PAL的性能,其中包括散射和反射.
结论:
- 拟议的非线性声场控制框架和算法显著提高了PAL在挑战性室内声学中的性能.
- 这种方法克服了线性控制方法的局限性,解决了PAL固有的非线性.
- 该研究验证了非线性控制在实际应用中提高指导性和声音质量的有效性.
相关概念视频
01:21Perceiving Loudness, Pitch, and Location
188
The human brain perceives pitch through two primary mechanisms reflected in place theory and frequency theory. Each mechanism describes how sound waves are interpreted as specific pitches by the brain, offering insights into the intricate processes of auditory perception.
Place theory, or place coding, suggests that different pitches are heard because various sound waves activate specific locations along the cochlea's basilar membrane. The brain determines the pitch of a sound by...
Place theory, or place coding, suggests that different pitches are heard because various sound waves activate specific locations along the cochlea's basilar membrane. The brain determines the pitch of a sound by...
188
01:24Frequency-Domain Interpretation of PD Control
89
Proportional-Derivative (PD) controllers are widely used in fan control systems to improve stability and performance. A fan control system can be effectively represented using a Bode plot to illustrate the impact of a PD controller through its transfer function. The Bode plot visually conveys how PD control modifies the fan's response across various frequencies, providing a frequency domain interpretation of the controller's behavior.
The proportional control gain, combined with the...
The proportional control gain, combined with the...
89
01:10Wave Parameters
7.6K
The simplest mechanical waves are associated with simple harmonic motion and repeat themselves for several cycles. These simple harmonic waves can be modeled using a combination of sine and cosine functions. Consider a simplified surface water wave that moves across the water's surface. Unlike complex ocean waves, in surface water waves, water moves vertically, oscillating up and down, whereas the disturbance of the wave moves horizontally through the medium. If a seagull is floating on the...
7.6K
01:23Design Example
316
The innovation of touch-tone telephony revolutionized the telecommunications industry by replacing the traditional rotary dial with a dual-tone multi-frequency (DTMF) signaling system. This system uses a matrix-style keypad with buttons arranged in four rows and three columns, creating 12 distinct signals each assigned to a pair of frequencies. Each button press results in a simultaneous generation of two sinusoidal tones – one from a low-frequency group (697 to 941 Hz) and one from a...
316
01:10Interference: Path Lengths
1.3K
Consider two sources of sound, that may or may not be in phase, emitting waves at a single frequency, and consider the frequencies to be the same.
Two special sources may be considered when they are in phase. This can be easily achieved by feeding the two sources from the same source. An example would be synchronizing the two speakers by feeding them with the same source, such as the sound waves produced by a tuning fork. This setup ensures that the two sources have the same frequency and are...
Two special sources may be considered when they are in phase. This can be easily achieved by feeding the two sources from the same source. An example would be synchronizing the two speakers by feeding them with the same source, such as the sound waves produced by a tuning fork. This setup ensures that the two sources have the same frequency and are...
1.3K
01:17Bandpass Sampling
159
In signal processing, bandpass sampling is an effective technique for sampling signals that have most of their energy concentrated within a narrow frequency band. This type of signal is known as a bandpass signal. The key principle of bandpass sampling involves sampling the signal at a rate that is greater than twice the signal's bandwidth to prevent aliasing.
A bandpass signal has a spectrum with a lower frequency limit, denoted as ω1, and an upper frequency limit, denoted as ω2....
A bandpass signal has a spectrum with a lower frequency limit, denoted as ω1, and an upper frequency limit, denoted as ω2....
159