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相关概念视频

Echo01:06

Echo

886
The human ear cannot distinguish between two sources of sound if they happen to reach within a specific time interval, typically 0.1 seconds apart. More than this, and they are perceived as separate sources.
Imagine the sound is reflected back to the ears. Assuming that the source is very close to the human, the difference between hearing the two sounds—the emitted sound and the reflected sound—may be more than the minimum time for perceiving distinct sounds. If this is the case,...
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Reconstruction of Signal using Interpolation01:10

Reconstruction of Signal using Interpolation

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Signal processing techniques are essential for accurately converting continuous signals to digital formats and vice versa. When a continuous signal is sampled with a period T, the resulting sampled signal exhibits replicas of the original spectrum in the frequency domain, spaced at intervals equal to the sampling frequency. To handle this sampled signal, a zero-order hold method can be applied, which creates a piecewise constant signal by retaining each sample's value until the next...
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Interference: Path Lengths01:10

Interference: Path Lengths

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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...
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Interference and Diffraction02:18

Interference and Diffraction

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Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.
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Doppler Effect - II01:05

Doppler Effect - II

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The Doppler effect has several practical, real-world applications. For instance, meteorologists use Doppler radars to interpret weather events based on the Doppler effect. Typically, a transmitter emits radio waves at a specific frequency toward the sky from a weather station. The radio waves bounce off the clouds and precipitation and travel back to the weather station. The radio frequency of the waves reflected back to the station appears to decrease if the clouds or precipitation are moving...
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Sound Waves: Interference00:53

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Sound waves can be modeled either as longitudinal waves, wherein the molecules of the medium oscillate around an equilibrium position, or as pressure waves. When two identical waves from the same source superimpose on each other, the combination of two crests or two troughs results in amplitude reinforcement known as constructive interference. If two identical waves, that are initially in phase, become out of phase because of different path lengths, the combination of crests with troughs...
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相关实验视频

Updated: Jan 15, 2026

Tracking Infiltration Front Depth Using Time-lapse Multi-offset Gathers Collected with Array Antenna Ground Penetrating Radar
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在时间延迟插曲以改善声学反射器定位.

Hannes Rosseel1, Toon van Waterschoot1

  • 1KU Leuven, Department of Electrical Engineering (ESAT), STADIUS Center for Dynamical Systems, Signal Processing and Data Analytics, Kasteelpark Arenberg 10, 3001 Leuven, Belgium.

The Journal of the Acoustical Society of America
|October 10, 2025
PubMed
概括
此摘要是机器生成的。

精确的声学反射器定位使用时间延迟估计 (TDE) 插值. 辛克和惠塔克-香农插值方法显著提高了亚样本TDE精度,在模拟和现实测试中表现优于其他方法.

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科学领域:

  • 声学 声学 在声学方面
  • 信号处理 信号处理
  • 计算物理 计算物理

背景情况:

  • 声学反射器定位对于房间声学和声音源定位等应用至关重要.
  • 传统的时间延迟估计 (TDE) 方法缺乏精确定位所需的时间分辨率.
  • 亚样本TDE精度是必要的,这导致了各种插值技术的发展.

研究的目的:

  • 综合研究时间延迟插值,以实现声学反射器定位的亚样本精度.
  • 在短时间窗口TDE的背景下推导和评估惠特克-香农插值公式.
  • 为了比较 sinc 和 Whittaker-Shannon 插值与现有方法的性能.

主要方法:

  • 从短时间窗口TDE的sinc插位推导Whittaker-Shannon插位公式的推导.
  • 模拟来评估时间延迟误差和位置误差对于临界采样和带限反射.
  • 使用来自MYRiAD数据集的现实世界测量的性能评估.

主要成果:

  • 与现有技术相比,Sinc和Whittaker-Shannon插值方法显示出更高的性能.
  • 这些方法在模拟中实现了较低的时间延迟误差和位置误差.
  • 在各种配置的真实世界声学环境中观察到一致和可靠的性能.

结论:

  • 辛克和惠塔克 - 香农插值显著提高了对声学反射器定位的亚样本TDE精度.
  • 这些先进的插值技术提高了在反响条件下定位系统的精度.
  • 这些发现对于在室内声学,声源定位和声学场景分析方面的应用至关重要.