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Corticostriatal Neurons in the Anterior Auditory Field Regulate frequency discrimination Behavior

Neuroscience Bulletin 2023年第6期39卷 962-972页

作者： Zhao-Qun Wang Hui-Zhong Wen Tian-Tian Luo Peng-Hui Chen Yan-Dong Zhao Guang-Yan Wu Ying Xiong Department of Neurobiology Chongqing Key Laboratory of NeurobiologyArmy Medical UniversityChongqing400038China Experimental Center of Basic Medicine Army Medical UniversityChongqing400038China

The anterior auditory field(AAF)is a core region of the auditory cortex and plays a vital role in discrimination ***,the role of the AAF corticostriatal neurons in frequency discrimination remains ***,we used c-Fos staining,fiber photometry recording,and pharmacogenetic manipulation to investigate the function of the AAF corticostriatal neurons in a frequency discrimination task.c-Fos staining and fiber photometry recording revealed that the activity of AAF pyramidal neurons was significantly elevated during the frequency discrimination *** inhibition of AAF pyramidal neurons significantly impaired frequency *** addition,histological results revealed that AAF pyramidal neurons send strong projections to the ***,pharmacogenetic suppression of the striatal projections from pyramidal neurons in the AAF significantly disrupted the frequency ***,our findings show that AAF pyramidal neurons,particularly the AAF–striatum projections,play a crucial role in frequency discrimination behavior.

关键词： Anterior auditory field Corticostriatal neuron frequency discrimination AAF-striatum projection

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Analysis of single frequency modulation for passive hydrogen maser

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Journal of Systems Engineering and Electronics 2017年第4期28卷 661-668页

作者： Hefei Zheng Jing Li Wenming Wang Lianshan Gao Keming Feng Beijing Institute of Radio Metrology and Measurement The Second Academy of China Aerospace Science and Industry CorporationBeijing 100854 China

Based on the theory of the passive hydrogen maser, along with the technology of frequency modulation and modulation transfer spectroscopy, the theoretical expression of the single frequency modulation for the passive hydrogen maser and the function of the cavity and H line error signals separation are derived, which are basically coincident with the experiment. The absorption and dispersion spectrum curves with different resonance widths show that the cavity and hydrogen transition serve as discriminators, and the two error signals can be separated. Through the calculations of the two error signals in the passive hydrogen maser, it analyzes the traditional method of the two error signals separation, and then describes a new improved method for the passive hydrogen servo loops consisting in the use of a single modulation frequency and frequency discrimination. A null interaction of the two error signals for the new selection of the phase setting is deduced theoretically and validated by the simulation. The preliminary experimental result confirms the feasibility of this new approach, which can reduce the influence from the cavity frequency variety on the crystal oscillator and contribute significantly to the long term performance of the passive hydrogen maser.

关键词： passive hydrogen maser single frequency modulation frequency discrimination

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Digital Demodulation Algorithm for Multi-Tone FM Signal in New Type Track Circuit

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Journal of Beijing Institute of Technology 2006年第3期15卷 331-335页

作者：祝林啸吴嗣亮 School of Information Science and Technology Beijing Institute of Technology Beijing 100081 China

The multi-tone frequency modulation （FM） signal transferred through track circuit in automatic train control （ATC） system is analyzed. A digital filter with ideal sloping shape in frequency domain is designed for frequency discrimination. With this filter, the FM signal is converted into AM-FM signal by frequency-to-amplitude conversion. The modulating signal is finally extracted from the envelope of the AM-FM signal. Simulations show that the digital demodulation method could accurately recover the modulating signal in low signal noise ratio （SNR） circumstance, and has good performance in suppressing interference of harmonies of traction current frequency. The feasibility of the proposed method is proved in a hardware system based on SHARC DSP.

关键词： track circuit multi-tone frequency modulation frequency discrimination

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