scholarly journals Nakagami's Approximation for Distribution of Signal Envelope in TWDP Channel

2020 ◽  
Vol 0 (82) ◽  
pp. 74-80
Author(s):  
O. Ya. Kaliuzhnyi
Keyword(s):  
Signal Envelope

New Results and Applications about the Level Crossing Rate of SC Receiver output Signal in the Presence of Gamma Shadowing and k-μ or Rician Multipath Fading

2021 ◽  
Vol 20 ◽  
pp. 118-127
Author(s):  
DRAGANA KRSTIĆ ◽  
SUAD SULJOVIĆ ◽  
MIHAJLO STEFANOVIĆ ◽  
MUNEER MASADEH BANI YASSEIN ◽  
DANIJELA ALEKSIĆ
Keyword(s):  
Output Signal ◽  
Joint Probability ◽  
Multipath Fading ◽  
Average Level ◽  
Rician Fading ◽  
Level Crossing ◽  
Multipath Fading Channel ◽  
Signal Envelope ◽  
Level Crossing Rate ◽  
Severity Parameter

In this paper,the wireless communication system with dual SC receiver operating over shadowed multipath fading channel is considered. The multipath fadingis k-μor Rician.The received signal experiences the short term fading which is resulting in SC receiver envelope variation and Gamma long term fading resulting in SC receiver envelope power variation. The closed form expressions for joint probability density functions of SC receiver output signal envelope and their first derivative of SC receiver output signal envelope are calculated for both, k-μand Rician fading. These expressions are used for evaluation of average level crossing rate of SC receiver output signal envelopes. The numerical expressions are plotted to show the effect of Rician fading severity parameter and Gamma shadowing severity parameter on the average level crossing rate of SC receiver output signal envelope.

Echo signal envelope fitting based signal processing methods for ultrasonic gas flow-meter

2019 ◽  
Vol 89 ◽  
pp. 233-244 ◽  
Author(s):  
Li-Bin Mu ◽  
Ke-Jun Xu ◽  
Bo Liu ◽  
Lei Tian ◽  
Li-Ping Liang
Keyword(s):  
Signal Processing ◽  
Gas Flow ◽  
Echo Signal ◽  
Flow Meter ◽  
Processing Methods ◽  
Signal Envelope ◽  
Signal Processing Methods

A speech compression/expansion method based on subband filtering of the signal envelope

2003 ◽  
Vol 114 (4) ◽  
pp. 2360-2360
Author(s):  
Aslak Bjerkvik ◽  
Asbjorn Krokstad ◽  
Barbara Resch
Keyword(s):  
Expansion Method ◽  
Speech Compression ◽  
Signal Envelope

An Attempt to Improve Food/Sound Congruity Using an Electromyogram Pseudo-Chewing Sound Presentation System

2017 ◽  
Vol 21 (2) ◽  
pp. 342-349 ◽  
Author(s):  
Hiroshi Endo ◽  
◽  
Hidekazu Kaneko ◽  
Shuichi Ino ◽  
Waka Fujisaki
Keyword(s):  
Nursing Care ◽  
Digital Audio ◽  
Elderly Individuals ◽  
Signal Envelope ◽  
Emg Signal ◽  
Food Texture

Improving the texture of foods provided during nursing care is necessary to improve the appetite of elderly individuals. We developed a system to vary perceived food texture using pseudo-chewing sounds generated from electromyogram (EMG) signals. However, this previous system could not provide chewing sounds that were sufficiently congruous with foods. Because food/sound combinations that seem unnatural cause individuals to feel uncomfortable with pseudo-chewing sounds, food/sound congruity is important. This research aims to improve the derivation and presentation of pseudo-chewing sounds so as to be able to provide various kinds of chewing sounds. The developed system adjusts the volume of pseudo-chewing sounds that are stored in a digital audio player based on the amplitude of the EMG signal envelope. Using this system, food/sound congruity was examined with two kinds of softened Japanese pickles. Six kinds of pseudo-chewing sounds were tested (noisy chewing sound, EMG chewing sound, and four kinds of actual chewing sounds: rice cracker, cookie, and two kinds of Japanese pickles). Participants reported that food/sound combinations were unnatural with the noisy and EMG chewing sounds, whereas the combinations felt more natural with the pseudo-chewing sounds of Japanese pickles. We concluded that the newly developed system could effectively reduce the unnatural feeling of food/sound incongruity.

scholarly journals Anharmonic Discrete Signal Envelope Detection with Hilbert Transform in the Frequency Domain

2018 ◽  
Vol 16 (1) ◽  
pp. 33
Author(s):  
N V Ponomareva ◽  
O V Ponomareva ◽  
V V Khvorenkov
Keyword(s):  
Frequency Domain ◽  
Hilbert Transform ◽  
Discrete Signal ◽  
Signal Envelope ◽  
Envelope Detection

Рассмотрено применение преобразования Гильберта в частотной области на основе дискретного преобразования Фурье для определения огибающих (мгновенных амплитуд) действительных ангармонических аналоговых и дискретных сигналов. Ангармонические дискретные сигналы рассмотрены как отдельный класс периодических дискретных сигналов в связи с их специфическими свойствами и широким применением ангармонических сигналов для описания информационных сигналов в следующих предметных областях: акустика (в том числе психоакустика и музыкальная акустика), геофизика, виброакустическое функциональное диагностирование механических объектов, компьютерная медицинская диагностика, пассивная гидроакустика. Приведены физические условия выбора сигнала, сопряженного действительному ангармоническому сигналу. Предложен алгоритм гипотетического измерителя мгновенных значений огибающей, фазы и частоты действительного сигнала. Показано, что применение преобразования Гильберта в частотной области для получения аналитических ангармонических дискретных сигналов имеет преимущества перед генерацией аналитических ангармонических дискретных сигналов во временной области. Предложена структура получения дискретного аналитического сигнала методом дискретного преобразования Фурье действительного дискретного сигнала. Получены аналитические выражения огибающих ангармонических дискретных сигналов с различным числом составляющих равной амплитуды. Приведены экспериментальные исследования на модельных действительных ангармонических сигналах, подтвердившие результаты, полученные теоретически в аналитической форме.

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