Enhanced neural tracking of the fundamental frequency of the voice

AbstractObjective‘F0 tracking’ is a novel method that investigates the neural processing of the fundamental frequency of the voice (f0) in continuous speech. Through linear modelling, a feature that reflects the stimulus f0 is predicted from the EEG data. Then, the neural response strength is evaluated through the correlation between the predicted and actual f0 feature. The aim of this study was to improve upon this ‘f0 tracking’ method by optimizing the f0 feature.ApproachSpecifically, we aimed to design a feature that approximates the expected EEG responses to the f0. We hypothesized that this would improve neural tracking results, because the more similar the feature and the neural response are, the easier it will be to reconstruct the one from the other. Two techniques were explored: a phenomenological model to simulate neural processing in the auditory periphery and a low-pass filter to approximate the effect of more central processing on the f0 response. Since these optimizations target different aspects of the auditory system, they were also applied in a cumulative fashion.ResultsResults obtained from EEG evoked by a Flemish story in 34 subjects indicated that both the use of the auditory model and the addition of the low-pass filter significantly improved the correlations between the actual and reconstructed feature. The combination of both strategies almost doubled the mean correlation over subjects, from 0.78 to 0.13. Moreover, canonical correlation analysis with the modelled feature revealed two distinct processes contributing to the f0 response: one driven by the compound activity of auditory nerve fibers with center frequency up to 8 kHz and one driven predominantly by the auditory nerve fibers with center frequency below 1 kHz.SignificanceThe optimized f0 features developed in this study enhance the analysis of f0-tracking responses and facilitate future research and applications.

Download Full-text

Design of an Ideal Low Pass Microstrip Line Filter Using the Defected Ground Structure

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.876.133 ◽

2018 ◽

Vol 876 ◽

pp. 133-137

Author(s):

Ping Cheng Chen ◽

Chung Long Pan ◽

J.D. Huang ◽

S.H. Hong

Keyword(s):

Frequency Response ◽

Microstrip Line ◽

Geometric Shape ◽

Center Frequency ◽

Defected Ground Structure ◽

Ground Structure ◽

Pass Filter ◽

Low Pass Filter ◽

Ansoft Hfss ◽

Low Pass

A design and simulation for low pass microstrip line filter with defected ground structure has been researched, the main purpose is with the simplest method to design an ideal low pass filter. In this paper, simulated soft (Ansoft HFSS V.6.0) used to be simulated the frequency response under different geometric shape of DGS. The results show good performance of a low pass filter with DGS. Final, a low pass filter with DGS design and fabricated, The properties are shown as flow: center-frequency: 7.28G, S21:-47dB, cut-off frequency: 5.88GHz.

Download Full-text

Novel Low-Pass Microwave Filter Based on Rectangular Ring DGS

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.273.371 ◽

2013 ◽

Vol 273 ◽

pp. 371-374

Author(s):

Bao Ping Li ◽

Yan Liang Zhang

Keyword(s):

Stop Band ◽

Center Frequency ◽

Pass Band ◽

Band Pass Filter ◽

Defected Ground Structure ◽

Ground Structure ◽

Pass Filter ◽

Low Pass Filter ◽

Compact Size ◽

Low Pass

Due to the frequency response periodicity of distributed transmission line, microstrip band-pass filter usually produces parasitic pass-band and outputs harmonics away from the center frequency of main pass-band. Based on the study of rectangular ring defected ground structure, a 5-order microstrip LPF(low-pass filter) was designed using the single-pole band-stop and slow-wave characteristics of the rectangular ring DGS(Defected Ground Structure) and SISS(Step-Impedance Shunt Stub) structure. Compared with traditional LPF, this LPF presents the advantages of compact size, low insertion loss, broad stop-band and high steep. It also validates the requirements of miniaturization and high performance for filters.

Download Full-text

A semi-lumped microstrip UWB bandpass filter

International Journal of Microwave and Wireless Technologies ◽

10.1017/s1759078709000117 ◽

2009 ◽

Vol 1 (1) ◽

pp. 57-64 ◽

Cited By ~ 1

Author(s):

Darine Kaddour ◽

Jean-Daniel Arnould ◽

Philippe Ferrari

Keyword(s):

Group Delay ◽

Bandpass Filter ◽

Filter Design ◽

Sensitivity Study ◽

Critical Parameters ◽

Center Frequency ◽

Pass Filter ◽

Low Pass Filter ◽

Low Pass ◽

High Pass

In this paper, a miniaturized bandpass filter for ultra-wide-band applications is proposed. It is based on the embedding of high-pass structures in a low-pass filter. A semi-lumped technology combining surface-mounted capacitors and transmission lines has been used. The filter design rules have been carried out. Furthermore, two filters having a 3-dB fractional bandwidth of 142 and 150%, centered at 0.77 and 1 GHz, respectively, have been realized for a proof of concept. Measured characteristics, in good agreement with simulations, show attractive properties of return loss (|S11| <−18 dB), insertion loss (<0.3 dB), and a maximum group delay and group delay variation of 2 and 1.3 ns, respectively. A distributed filter based on the same low-pass/high-pass approach has been also realized and measured for comparison. The size reduction reaches 85% for the semi-lumped filter, and its selectivity is improved with a shape factor of 1.3:1 instead of 1.5:1. The semi-lumped filter's drawback is related to a smaller rejection bandwidth compared to the distributed one. To improve the high-frequency stopband, an original technique for spurious responses suppression based on capacitively loaded stubs has been proposed. Even if the performances do not reach that obtained for the distributed approach, with this technique spurious responses are pushed until eight times the center frequency. A sensitivity study vs. critical parameters has also been carried out, showing the robustness of the design.

Download Full-text

Real-Time Filter Method Based on the Structural Frequency of FAST Cabin-Cable System

Advances in Mechanical Engineering ◽

10.1155/2014/129302 ◽

2014 ◽

Vol 6 ◽

pp. 129302

Author(s):

Wenhua Xu ◽

Hong Bao ◽

Jianwei Mi ◽

Guigeng Yang

Keyword(s):

Real Time ◽

Fundamental Frequency ◽

Variable Structure ◽

Measured Data ◽

Filter Method ◽

Great Flexibility ◽

Cable System ◽

Pass Filter ◽

Low Pass Filter ◽

Low Pass

Due to great flexibility, low damping, and variable structure in the cabin-cable system of five hundred meter Aperture Spherical Radio Telescope (FAST), a real-time digital low-pass filter based on the analysis of frequency is presented in this paper. Firstly, by the Lomb-Scargle theorem, it can obtain the fundamental frequency of cabin-cable system. Then, using the obtained frequency, a digital low-pass filter is designed to filter the measured data. After being filtered, the measured data are used for coarse control. Finally, the results of the experiments on the FAST 5 m model show that calculating the fundamental frequency is accurate and the filter is effective.

Download Full-text

Design and Optimization of Microstrip Stub Bandstop Filter Based on ADS

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.743.233 ◽

2015 ◽

Vol 743 ◽

pp. 233-238 ◽

Cited By ~ 1

Author(s):

Qi Yuan Zhu ◽

Xiang Li Meng

Keyword(s):

High Reliability ◽

Center Frequency ◽

Design System ◽

Relative Width ◽

Pass Filter ◽

Low Pass Filter ◽

Design And Optimization ◽

Short Period ◽

Low Pass ◽

Bandstop Filter

Microstrip filter has extensive application in microwave circuit and communication system in the future. We take lumped components low-pass filter as the prototype and employ the Richards transformation and the Kuroda rule to change the low pass prototype into a bandstop filter. By using ADS (Advanced Design System) method we design a microstrip stub bandstop filter, whose center frequency, range of frequency and relative width are respectively 4GHz, 3GHz ~ 5GHz and 8%. And then we further optimize the parameters to get the circuit design layout. It is shown that all indexes reach the design requirements and the method possesses the features such as short period and high reliability.

Download Full-text

Lumped Element RF Low Pass Filter with 20 dB Improved Suppression at the Center Frequency of an RF Injection Network for Conductive Emission Testing

2019 IEEE Canadian Conference of Electrical and Computer Engineering (CCECE) ◽

10.1109/ccece.2019.8861975 ◽

2019 ◽

Author(s):

Ali Attaran ◽

William B. Handler ◽

Blaine A. Chronik

Keyword(s):

Center Frequency ◽

Pass Filter ◽

Low Pass Filter ◽

Lumped Element ◽

Emission Testing ◽

Low Pass

Download Full-text

The Integrated Design of Power Dividerand Low-pass Filter

Frequenz ◽

10.1515/freq-2017-0206 ◽

2018 ◽

Vol 72 (11-12) ◽

pp. 517-521

Author(s):

Guoan Wu ◽

Siyuan Dong ◽

Qinfen Xu

Keyword(s):

Second Harmonic ◽

Integrated Design ◽

Power Divider ◽

Center Frequency ◽

Harmonic Suppression ◽

Pass Filter ◽

Low Pass Filter ◽

Low Pass ◽

Wilkinson Power Divider ◽

Low Pass Filters

Abstract A compact filtering Wilkinson power divider with harmonic suppression based on lumped components is presented in this paper. The new divider uses two 5th-order elliptic-function low-pass filters to replace the quarter wavelength microstrip lines of the conventional Wilkinson power divider. The structure combines the power divider and the filter into a complete device. By integrating elliptic low-pass filters with the power divider, the proposed structure can suppress harmonics due to the filter’s band-notched characteristic. The power divider demonstrates a measured suppression of 37.1 dB for the second harmonic, 36.6 dB for the third harmonic, 38.6 dB for the fourth harmonic respectively. The harmonic suppression is higher than 20 dB from 2.75 to 7.035 GHz. Furthermore, lumped components are utilized to achieve improvement on size reduction. Compared with the conventional divider, the proposed structure effectively reduces the size by 77 %. The insertion loss is 3.2 dB at the center frequency (1.45GHz).

Download Full-text