The Embedded Design of Vibrator Sweep Signal Generator Based on ARM9

2012 ◽  
Vol 229-231 ◽  
pp. 1527-1530
Author(s):  
Yuan Yuan Shen ◽  
Gong Ming Zheng
Keyword(s):  
Signal Generator ◽  
Test Results ◽  
Embedded Design ◽  
Linux Platform

This paper presents the embedded design of sweep signal generator which is based on ARM9+Linux platform. It describes DAC712 device dentally and prepared a DAC driver and upper application. Finally, the test signals generated by the system obtained the test results and the results were analyzed.

High-Precision Quadrature Signal Generator for Digital Demodulation of MEMS Gyroscope

2015 ◽  
Vol 645-646 ◽  
pp. 561-565
Author(s):  
Dan Hua Chen ◽  
Li Chen ◽  
Hui Zhou ◽  
Ying Tian
Keyword(s):  
Standard Deviation ◽  
High Stability ◽  
Signal Generator ◽  
Test Results ◽  
Direct Digital Synthesis ◽  
Mems Gyroscope ◽  
Quadrature Signal ◽  
Digital Synthesis ◽  
Fpga Chip ◽  
Digital Demodulation

A new quadrature signal generator based on Direct Digital Synthesis (DDS) algorithm for digital demodulation of MEMS gyroscope was proposed in this paper. To avoid quantization error, the dual-accumulator with signal-ROM structure was adopted. This signal generator was realized in FPGA chip, which could be quit compact to realize all digital demodulation in one chip. Simulations and tests of the generator were carried out. The test results demonstrate that the signal generator achieves high stability. The standard deviation of the frequency is 0.075Hz and the standard deviation of the amplitude is 0.037mV.

Ultra High Frequency Polynomial and Trigonometric Higher Order Neural Networks for Control Signal Generator

2016 ◽  
pp. 1-34 ◽  
Author(s):  
Ming Zhang
Keyword(s):  
Neural Network ◽  
Neural Networks ◽  
High Frequency ◽  
Higher Order ◽  
Signal Generator ◽  
Control Signal ◽  
Test Results ◽  
Model Learning ◽  
Ultra High Frequency ◽  
Higher Order Neural Networks

This chapter develops a new nonlinear model, Ultra high frequency Polynomial and Trigonometric Higher Order Neural Networks (UPT-HONN), for control signal generator. UPT-HONN includes UPS-HONN (Ultra high frequency Polynomial and Sine function Higher Order Neural Networks) and UPC-HONN (Ultra high frequency Polynomial and Cosine function Higher Order Neural Networks). UPS-HONN and UPC-HONN model learning algorithms are developed in this chapter. UPS-HONN and UPC-HONN models are used to build nonlinear control signal generator. Test results show that UPS-HONN and UPC-HONN models are better than other Polynomial Higher Order Neural Network (PHONN) and Trigonometric Higher Order Neural Network (THONN) models, since UPS-HONN and UPC-HONN models can generate control signals with error approaching 0.0000%.

Ultra High Frequency Polynomial and Trigonometric Higher Order Neural Networks for Control Signal Generator

2016 ◽  
pp. 648-681
Author(s):  
Ming Zhang
Keyword(s):  
Neural Network ◽  
Neural Networks ◽  
High Frequency ◽  
Higher Order ◽  
Signal Generator ◽  
Control Signal ◽  
Test Results ◽  
Model Learning ◽  
Ultra High Frequency ◽  
Higher Order Neural Networks

This chapter develops a new nonlinear model, Ultra high frequency Polynomial and Trigonometric Higher Order Neural Networks (UPT-HONN), for control signal generator. UPT-HONN includes UPS-HONN (Ultra high frequency Polynomial and Sine function Higher Order Neural Networks) and UPC-HONN (Ultra high frequency Polynomial and Cosine function Higher Order Neural Networks). UPS-HONN and UPC-HONN model learning algorithms are developed in this chapter. UPS-HONN and UPC-HONN models are used to build nonlinear control signal generator. Test results show that UPS-HONN and UPC-HONN models are better than other Polynomial Higher Order Neural Network (PHONN) and Trigonometric Higher Order Neural Network (THONN) models, since UPS-HONN and UPC-HONN models can generate control signals with error approaching 0.0000%.

scholarly journals Pembangkit Sinyal ELT pada Frekuensi 121,5 MHz

2019 ◽  
Vol 11 (1) ◽  
pp. 9-15
Author(s):  
Rustamaji Rustamaji ◽  
Kania Sawitri ◽  
Ray Hapri Sitepu
Keyword(s):  
Low Cost ◽  
Signal Generator ◽  
Sinusoidal Signal ◽  
Civil Aviation ◽  
Test Results ◽  
Crystal Oscillator ◽  
Transmit Power ◽  
Amplitude Modulator ◽  
Minimum Amplitude ◽  
Sawtooth Generator

An ELT is a beacon indicating the location of distress or crash of aircraft on land or sea. The ELT is placed in an airplane, which is a transmitter with low transmit power and an antenna. The ELT transmitter has been widely used for flights at the frequency of 121.5 MHz (civilian) and 243 MHz (military). The purpose of this study is to produce ELT signal generators at the 121.5 MHz frequency, with low-cost devices that meet specifications for civil aviation. In this research has been produced a design of an ELT signal generator at the frequency of 121.5 MHz, consist of a crystal oscillator, a sawtooth generator, a VCO, and an amplitude modulator. Based on the measurement and test results, the sawtooth generator generated a sawtooth signal at the frequency of 1.8 to 3.6 Hz, the VCO generated a sinusoidal signal at the frequency of 316 to 366 Hz, the RF generator generated a sinusoidal at the frequency of 121.505 MHz. The ELT signal generator was able to generate AM signals at the minimum amplitude deviation of 100 mVpp to maximum one of 156 mVpp, the modulation index (m) of 21.875%, and the frequency of 121.505 MHz. The results of this study are ELT signal generators at the frequencies of 121.5 MHz that are in accordance with specifications for civil aviation.

A Computer Controllable Microwave Signal Generator for CPT Atomic Clock

2012 ◽  
Vol 220-223 ◽  
pp. 2654-2657 ◽  
Author(s):  
Jian Xu ◽  
Ting Lin ◽  
Zhi Yin Gan
Keyword(s):  
Modulation Depth ◽  
Atomic Clock ◽  
Phase Lock Loop ◽  
Microwave Signal ◽  
Signal Generator ◽  
Coherent Population Trapping ◽  
Test Results ◽  
Direct Digital Synthesizer ◽  
Population Trapping ◽  
Frequency Phase

This paper proposed a microwave signal generator which employed a phase lock loop (PLL) chip and several direct digital synthesizer (DDS) chips to make the frequency modulated microwave signal for coherent population trapping (CPT) atomic clock. Based on the communication between a computer and the MCU, it could be completely controlled that frequency, phase, working mode and modulation depth of the output signal by self-developed software. Spectrum and oscilloscope test results showed all the output signals could be suitable for the CPT atomic application.

Control Signal Generator Based on Ultra-High Frequency Polynomial and Trigonometric Higher Order Neural Networks

2021 ◽  
pp. 416-454
Keyword(s):  
Neural Network ◽  
Neural Networks ◽  
High Frequency ◽  
Higher Order ◽  
Signal Generator ◽  
Control Signal ◽  
Test Results ◽  
Model Learning ◽  
Ultra High Frequency ◽  
Higher Order Neural Networks

This chapter develops a new nonlinear model, ultra high frequency polynomial and trigonometric higher order neural networks (UPT-HONN) for control signal generator. UPT-HONN includes UPS-HONN (ultra high frequency polynomial and sine function higher order neural networks) and UPC-HONN (ultra high frequency polynomial and cosine function higher order neural networks). UPS-HONN and UPC-HONN model learning algorithms are developed in this chapter. UPS-HONN and UPC-HONN models are used to build nonlinear control signal generator. Test results show that UPS-HONN and UPC-HONN models are better than other polynomial higher order neural network (PHONN) and trigonometric higher order neural network (THONN) models, since UPS-HONN and UPC-HONN models can generate control signals with error approaching 10-6.

Using Conventional Articulation Tests With Highly Unintelligible Children

1992 ◽  
Vol 23 (1) ◽  
pp. 52-60 ◽  
Author(s):  
Pamela G. Garn-Nunn ◽  
Vicki Martin
Keyword(s):  
Test Results ◽  
Phonological Processes ◽  
Rule Based ◽  
Severity Level ◽  
Error Sensitivity ◽  
Conventional Tests ◽  
Severity Levels ◽  
Conventional Test ◽  
Impaired Children

This study explored whether or not standard administration and scoring of conventional articulation tests accurately identified children as phonologically disordered and whether or not information from these tests established severity level and programming needs. Results of standard scoring procedures from the Assessment of Phonological Processes-Revised, the Goldman-Fristoe Test of Articulation, the Photo Articulation Test, and the Weiss Comprehensive Articulation Test were compared for 20 phonologically impaired children. All tests identified the children as phonologically delayed/disordered, but the conventional tests failed to clearly and consistently differentiate varying severity levels. Conventional test results also showed limitations in error sensitivity, ease of computation for scoring procedures, and implications for remediation programming. The use of some type of rule-based analysis for phonologically impaired children is highly recommended.

Vestibular Function and Motion Sickness Susceptibility: Videonystagmographic Evidence From Oculomotor and Caloric Tests

2020 ◽  
Vol 29 (2) ◽  
pp. 188-198
Author(s):  
Cynthia G. Fowler ◽  
Margaret Dallapiazza ◽  
Kathleen Talbot Hadsell
Keyword(s):  
Phase Velocity ◽  
Motion Sickness ◽  
Repeated Measures ◽  
Short Form ◽  
Vestibular Function ◽  
Slow Phase ◽  
Test Results ◽  
Normal Range ◽  
Slow Phase Velocity ◽  
Caloric Tests

Purpose Motion sickness (MS) is a common condition that affects millions of individuals. Although the condition is common and can be debilitating, little research has focused on the vestibular function associated with susceptibility to MS. One causal theory of MS is an asymmetry of vestibular function within or between ears. The purposes of this study, therefore, were (a) to determine if the vestibular system (oculomotor and caloric tests) in videonystagmography (VNG) is associated with susceptibility to MS and (b) to determine if these tests support the theory of an asymmetry between ears associated with MS susceptibility. Method VNG was used to measure oculomotor and caloric responses. Fifty young adults were recruited; 50 completed the oculomotor tests, and 31 completed the four caloric irrigations. MS susceptibility was evaluated with the Motion Sickness Susceptibility Questionnaire–Short Form; in this study, percent susceptibility ranged from 0% to 100% in the participants. Participants were divided into three susceptibility groups (Low, Mid, and High). Repeated-measures analyses of variance and pairwise comparisons determined significance among the groups on the VNG test results. Results Oculomotor test results revealed no significant differences among the MS susceptibility groups. Caloric stimuli elicited responses that were correlated positively with susceptibility to MS. Slow-phase velocity was slowest in the Low MS group compared to the Mid and High groups. There was no significant asymmetry between ears in any of the groups. Conclusions MS susceptibility was significantly and positively correlated with caloric slow-phase velocity. Although asymmetries between ears are purported to be associated with MS, asymmetries were not evident. Susceptibility to MS may contribute to interindividual variability of caloric responses within the normal range.

Item Context and /s/ Phone Articulation Test Results

1972 ◽  
Vol 15 (4) ◽  
pp. 852-860 ◽  
Author(s):  
Zoe Zehel ◽  
Ralph L. Shelton ◽  
William B. Arndt ◽  
Virginia Wright ◽  
Mary Elbert
Keyword(s):  
Test Score ◽  
Sound Production ◽  
Broad Context ◽  
Test Results ◽  
Production Task ◽  
Test Result

Fourteen children who misarticulated some phones of the /s/ phoneme were tape recorded articulating several lists of items involving /s/. The lists included the Mc-Donald Deep Test for /s/, three lists similar to McDonald’s but altered in broad context, and an /s/ sound production task. Scores from lists were correlated, compared for differences in means, or both. Item sets determined by immediate context were also compared for differences between means. All lists were found to be significantly correlated. The comparison of means indicated that both broad and immediate context were related to test result. The estimated “omega square” statistic was used to evaluate the percentage of test score variance attributable to context.

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