Toward automatic phenotyping of retinal images from genetically determined mono- and dizygotic twins using amplitude modulation-frequency modulation methods

2010 ◽  
Author(s):  
P. Soliz ◽  
B Davis ◽  
V. Murray ◽  
M. Pattichis ◽  
S. Barriga ◽  
...  
Keyword(s):  
Amplitude Modulation ◽  
Frequency Modulation ◽  
Modulation Frequency ◽  
Retinal Images ◽  
Dizygotic Twins ◽  
Modulation Methods ◽  
Genetically Determined ◽  
Automatic Phenotyping

Probing the Adsorption of Weak Acids on Graphite Using Amplitude Modulation–Frequency Modulation Atomic Force Microscopy

Langmuir ◽  
2015 ◽  
Vol 31 (10) ◽  
pp. 3069-3075 ◽  
Author(s):  
Ahmed M. A. Moustafa ◽  
Jun Huang ◽  
Kerry N. McPhedran ◽  
Hongbo Zeng ◽  
Mohamed Gamal El-Din
Keyword(s):  
Atomic Force Microscopy ◽  
Amplitude Modulation ◽  
Frequency Modulation ◽  
Modulation Frequency ◽  
Weak Acids ◽  
Force Microscopy ◽  
Atomic Force

A 2D amplitude-modulation frequency-modulation representation for motion estimation

2016 ◽  
Author(s):  
Victor Murray ◽  
Alvaro Dasso ◽  
Juan Llanos ◽  
Paul Rodriguez ◽  
Marios S. Pattichis
Keyword(s):  
Motion Estimation ◽  
Amplitude Modulation ◽  
Frequency Modulation ◽  
Modulation Frequency

scholarly journals Research of metrological capabilities of digital (DDS- and Trueform-) generators

2021 ◽  
pp. 3-9
Author(s):  
Yurii Pavlenko ◽  
Sergii Kirienko ◽  
Valeriy Ogar ◽  
Olena Vаsileva
Keyword(s):  
Amplitude Modulation ◽  
Frequency Modulation ◽  
Nonlinear Distortion ◽  
Modulation Frequency ◽  
Frequency Deviation ◽  
Frequency Noise ◽  
Direct Digital Synthesis ◽  
Modulation Mode ◽  
Nonlinear Distortions ◽  
Digital Synthesis

Abstract One of the fundamental improvements of the measurement standard of frequency deviation of frequency-modulated oscillations was the replacement of analog frequency-modulated generators used in DETU 09-03-95 with digital ones based on the principle of direct digital synthesis (DDS) and its next version of Trueform technology. These generators have wider ranges of frequency deviation and modulation frequencies than analog ones, but nonlinear distortion laws of the frequency modulation are not standardized. The subject of the article is the development of methods and research of these generators and frequency-modulated signals generated by them for nonlinear distortions, accompanying amplitude modulation, frequency noise. Three methods were used in the study: direct measurement; “combination frequencies” and “frequency shift”. The experiment was performed using several measurement methods, which allowed to estimate very small values of nonlinear distortion. Methods were developed and experimental estimations of concomitant amplitude modulation of DDS-generators (in frequency modulation mode), as well as their frequency noise level, were performed. An experimental evaluation of the capabilities of the analog-digital demodulator of the R&S FSL6 spectrum analyzer with the K7 option was performed, its high linearity was shown, its capabilities with respect to the frequency ranges of carrier oscillations and frequency deviation were evaluated. The research results provide a basis for the method of calibration of DDS-generators and demodulator of spectrum analyzers with the K7 option in those ranges where their parameters are not normalized (at direct current up to 8 MHz and F up to 500 kHz).

Vocal Tremor Analysis With the Vocal Demodulator

1992 ◽  
Vol 35 (3) ◽  
pp. 562-573 ◽  
Author(s):  
William S. Winholtz ◽  
Lorraine Olson Ramig
Keyword(s):  
Amplitude Modulation ◽  
Frequency Modulation ◽  
Acoustic Analysis ◽  
Modulation Frequency ◽  
Low Frequency ◽  
New Device ◽  
Voice Signal ◽  
Vocal Tremor ◽  
Frequency Demodulation ◽  
Modulation Level

Acoustic analysis of vocal tremor has the potential to make significant quantitative and diagnostic contributions to the study of vocal disorders. This paper presents a new device for analysis of vocal tremor. The Vocal Demodulator produces amplitude- and frequency-demodulated outputs and measures the frequency and level (percent) of low-frequency tremor components in sustained phonation. A standard microphone is used to transduce the voice signal for input to the demodulator. The input fundamental frequency (F o ) range is 70–1200 Hz, and frequency response of the amplitude and frequency demodulation is 2.5–25 Hz. Five parameters are displayed in real time: F o , amplitude-modulation frequency, amplitude-modulation level, frequency-modulation frequency, and frequency-modulation level. Validation, calibration, and reliability data from synthesized test signals with modulation, as well as phonation from subjects with vocal tremor, subjects producing vibrato, and subjects with normal voice are presented. Research and clinical applications of this device are suggested.

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