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相关概念视频

Design Example01:23

Design Example

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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...
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The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
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Managing signal sampling rates is essential in digital signal processing to maintain signal integrity. A decimated signal, characterized by a reduced frequency range due to its lower sampling rate, can be upsampled by inserting zeros between each sample. This upsampling process expands the original spectrum and introduces repeated spectral replicas at intervals dictated by the new Nyquist frequency. To refine this zero-inserted sequence, it is passed through a lowpass filter with a cutoff...
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改进了频率扫描密钥CDMA使用更快的R-CNN用于扩展超声波交叉声减少.

Ga-Rin Park1, Sang-Ho Park1, Kwang-Ryul Baek2

  • 1School of Electric and Electronic Engineering, Pusan National University, Busan 46241, Republic of Korea.

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概括

这项研究引入了一种使用频率扫描键和基于快速区域的卷积神经网络 (R-CNN) 的新方法,通过减少交叉干扰来提高超声波传感器的精度. 拟议的方法显著提高了多传感器环境中的测量可靠性.

关键词:
自动驾驶自动驾驶的自动驾驶.声超声波的超声波是什么意思频率扫描键的使用频率扫描键.前后避免碰撞,避免碰撞.超声波CDMA是一种超声波CDMA.超声波减少交叉的减少超声波测距系统 超声波测距系统

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科学领域:

  • 传感器技术 传感器技术
  • 信号处理 信号处理
  • 人工智能的人工智能

背景情况:

  • 超声波传感器提供了具有成本效益的,准确的测量,但在多传感器设置中遭受交叉声波的影响.
  • 交音包括信号重叠和来自相似和不相似的超声波信号的干扰.
  • 现有的方法难以处理复杂的交叉通话场景,限制了传感器网络的性能.

研究的目的:

  • 开发一种强大的超声波传感方法,减轻交叉通话干扰.
  • 在具有多个超声波传感器的环境中提高测量精度和可靠性.
  • 为了解决异质信号的信号重叠和干扰.

主要方法:

  • 实施频率扫描键调制以提高信号稳定性.
  • 开发一个更快的基于区域的卷积神经网络 (R-CNN) 用于信号解调.
  • 训练更快的R-CNN使用信号谱图进行准确的分类和干扰拒绝.

主要成果:

  • 拟议的方法证明了对信号重叠的稳定性,并使用更短的代码实现了代码分割多重访问 (CDMA).
  • 与基于关联的频率扫描密钥相比,飞行时间错误减少了大约75%.
  • 该R-CNN调节器有效地忽略了很大一部分干扰信号 (99%的OK/PSK,79%的FSK).

结论:

  • 新的频率扫描键和更快的R-CNN方法在处理超声波交叉通话方面显著优于现有方法.
  • 这种方法为超声波传感应用提供了更高的准确性和可靠性.
  • 该技术显示出在各种多传感器超声波系统中广泛采用这一技术的希望.