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Wyświetlanie 1-4 z 4
Tytuł:
Efficient Two-Step Approach for Automatic Number Plate Detection
Autorzy:
Gorovyi, I.
Powiązania:
https://bibliotekanauki.pl/articles/226386.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
automatic number plate recognition (ANPR)
stroke width transform
features extraction
neural network
Opis:
Intelligent transportation systems are rapidly growing mainly due to active development of novel hardware and software solutions. In the paper a problem of automatical number plate detection is considered. An efficient two-step approach based on plate candidates extraction with further classification by neural network is proposed. Stroke width transform and contours detection techniques are utilized for the image preprocessing and extraction of regions of interest. Different local feature sets are used for the final number plate extraction step. Efficiency of the developed method is tested with real datasets.
Źródło:
International Journal of Electronics and Telecommunications; 2015, 61, 4; 351-356
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design of a Class-D Audio Amplifier With Analog Volume Control for Mobile Applications
Autorzy:
El Khadiri, K.
Qjidaa, H.
Powiązania:
https://bibliotekanauki.pl/articles/226924.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
class D amplifier
analog volume control
pulse width modulation (PWM)
ramp generator
Opis:
A class-D audio amplifier with analog volume control (AVC) for portable applications is proposed in this paper. The proposed class-D consist of two sections. First section is an analog volume control which consists of an integrator, an analog MUX and a programmable gain amplifier (PGA). The AVC is implemented with three analog inputs (Audio, Voice, FM). Second section is a driver which consists of a ramp generator, a comparator, a level shifter and a gate driver. The driver is designed to obtain a low distortion and a high efficiency. Designed with 0.18 um 1P6M CMOS technology, the class-D audio amplifier with AVC achieves a total root-mean-square (RMS) output power of 0.5W, a total harmonic distortion plus noise (THD+N) at the 8-Ω load less than 0.06% and a power efficiency of 90% with a total area of 1.74 mm2.
Źródło:
International Journal of Electronics and Telecommunications; 2016, 62, 2; 187-198
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fully Analytical Characterization of the Series Inductance of Tapered Integrated Inductors
Autorzy:
Passos, F.
Fino, M. H.
Moreno, E. R.
Powiązania:
https://bibliotekanauki.pl/articles/226450.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
inductor design
variable width integrated spiral inductor
integrated spiral inductor
CMOS analog circuits
IC designing
RF IC design
Opis:
In this paper a general method for the determination of the series inductance of polygonal tapered inductor s is presented. The value obtained can be integrated into any integrated inductor lumped element model, thus granting the overall characterization of the device and the evaluation of performance parameters such as the quality factor or the resonance frequency. In this work, the inductor is divided into several segments and the corresponding self and mutual inductances are calculated. In the end, results obtained for several working examples are compared against electromagnetic (EM) simulations are performed in order to check the validity of the model for square, hexagonal, octagonal and tapered inductors. The proposed method depends exclusively on the geometric characteristics of the inductor as well as the technological parameters. This allows its straight forward application to any inductor shape or technology.
Źródło:
International Journal of Electronics and Telecommunications; 2014, 60, 1; 73-77
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Linearized 9-Bit Hybrid LBDD PWM Modulator for Digital Class-BD Amplifier
Autorzy:
Kołodziejski, Wojciech
Kuta, Stanisław
Powiązania:
https://bibliotekanauki.pl/articles/1844591.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
class-BD digital audio amplifier
linearized pulse width modulation (LPWM)
Linearized Class-BD Double sided (LBDD)
Digital to Time Converter (DTC)
Opis:
The paper presents an original architecture and implementation of 9-bit Linearized Pulse Width Modulator (LPWM) for Class-BD amplifier, based on the hybrid method using STM32 microcontroller and Programmable Tapped Delay Line (PTDL). The analog input signals are converted into 12-bit PCM signals, then are directly transformed into 32-bit LBDD DPWM data of the pulse-edge locations within n-th period of the switching frequency, next requantized to the 9-bit digital outputs, and finally converted into the two physical trains of 1-bit PWM signals, to control the output stage of the Class-BD audio amplifier. The hybrid 9-bit quantizer converts 6 MSB bits using counter method, based on the peripherals of STM32 microcontroller, while the remaining 3 LSB bits - using a method based on the PTDL. In the paper extensive verification of algorithm and circuit operation as well as simulation in MATLAB and experimental results of the proposed 9-bit hybrid LBDD DPWM circuit have been performed. It allows to attain SNR of 80 dB and THD about 0,3% within the audio baseband.
Źródło:
International Journal of Electronics and Telecommunications; 2021, 67, 1; 49-57
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-4 z 4

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