• Title/Summary/Keyword: mismatch compensation

Search Result 88, Processing Time 0.022 seconds

A Convergence Compensation Algorithm for A CRT Projection TV (CRT 프로젝션 TV에서의 Convergence 보정 알고리즘)

  • 강석판;정창기;최두현
    • Proceedings of the IEEK Conference
    • /
    • 2003.11a
    • /
    • pp.355-358
    • /
    • 2003
  • Basically, the mis-convergence, which is inevitable in CRT Projection TV. is the degree of deviation of red and blue from green beam. The cause of mis-convergence is the change of magnetic field and electrical characteristic in deflection circuits and convergence amplification circuit. A new and easily implementable mis-convergence compensation algorithm is presented in this paper. The proposed algorithm does not needs any compensation devices. It uses only TV OSD and a remote controller and anyone who wants to compensate can easily correct the mismatch. Through real compensation experiments, it is found that the proposed algorithm is useful and effective one.

  • PDF

Model-based Inter-view Mismatch Compensation Algorithm for Multi-view Video Coding (다시점 영상 부호화를 위한 모형 기반 시점간 비정합 보상 알고리즘)

  • Jeon, Yeong-Il;Lee, Si-Woong
    • The Journal of the Korea Contents Association
    • /
    • v.8 no.7
    • /
    • pp.1-8
    • /
    • 2008
  • In this paper, an algorithm to compensate the inter-view mismatch in the multi-view video according to the different characteristics of cameras is presented. Interview mismatches make it difficult to merge the multi-view images and decrease the coding performance. So, a preprocessing operation to compensate the mismatches is requisite in the multi-view video coding. It is shown that the mismatch in the outputs of multi-view cameras with different electro-optical transfer functions can be approximated with a linear model of a gain and an offset. In addition, a new algorithm for estimating and compensating the inter-view mismatch based on the detection of the overlapped region is presented. Experimental results using various rectified stereo images show that the proposed method compensates inter-view mismatches more accurately compared to the conventional approach.

Feature Compensation Combining SNR-Dependent Feature Reconstruction and Class Histogram Equalization

  • Suh, Young-Joo;Kim, Hoi-Rin
    • ETRI Journal
    • /
    • v.30 no.5
    • /
    • pp.753-755
    • /
    • 2008
  • In this letter, we propose a new histogram equalization technique for feature compensation in speech recognition under noisy environments. The proposed approach combines a signal-to-noise-ratio-dependent feature reconstruction method and the class histogram equalization technique to effectively reduce the acoustic mismatch present in noisy speech features. Experimental results from the Aurora 2 task confirm the superiority of the proposed approach for acoustic feature compensation.

  • PDF

Design of a 2.5GHz Quadrature LC VCO with an I/Q Mismatch Compensator (I/Q 오차 보정 회로를 갖는 2.5GHz Quadrature LC VCO 설계)

  • Byun, Sang-Jin;Shim, Jae-Hoon
    • Journal of the Institute of Electronics Engineers of Korea SD
    • /
    • v.48 no.2
    • /
    • pp.35-43
    • /
    • 2011
  • In this paper, an analysis on I/Q mismatch characteristics of a quadrature LC VCO(Voltage controlled oscillator) is presented. Based on this analysis, a new I/Q mismatch compensator is proposed. The proposed I/Q mismatch compensator utilizes an amplitude mismatch detector rather than the conventional phase mismatch detector requiring much more wide frequency bandwidth. To verify the proposed circuit, a 2.5GHz quadrature LC VCO was designed in a $0.18{\mu}m$ CMOS process and tested. Test results show that an amplitude mismatch detector achieves similar I/Q mismatch compensation performance as that of the conventional phase mismatch detector. The I/Q mismatch compensator consumes 0.4mA from 1.8V supply voltage and occupies $0.04mm^2$.

A Multiphase Compensation Method with Dynamic Element Matching Technique in Σ-Δ Fractional-N Frequency Synthesizers

  • Chen, Zuow-Zun;Lee, Tai-Cheng
    • JSTS:Journal of Semiconductor Technology and Science
    • /
    • v.8 no.3
    • /
    • pp.179-192
    • /
    • 2008
  • A multiphase compensation method with mismatch linearization technique, is presented and demonstrated in a $\Sigma-\Delta$ fractional-N frequency synthesizer. An on-chip delay-locked loop (DLL) and a proposed delay line structure are constructed to provide multiphase compensation on $\Sigma-\Delta$ quantizetion noise. In the delay line structure, dynamic element matching (DEM) techniques are employed for mismatch linearization. The proposed $\Sigma-\Delta$ fractional-N frequency synthesizer is fabricated in a $0.18-{\mu}m$ CMOS technology with 2.14-GHz output frequency and 4-Hz resolution. The die size is 0.92 mm$\times$1.15 mm, and it consumes 27.2 mW. In-band phase noise of -82 dBc/Hz at 10 kHz offset and out-of-band phase noise of -103 dBc/Hz at 1 MHz offset are measured with a loop bandwidth of 200 kHz. The settling time is shorter than $25{\mu}s$.

A Feed-forward Method for Reducing Current Mismatch in Charge Pumps (전하 펌프의 전류 부정합 감소를 위한 피드포워드 방식)

  • Lee, Jae-Hwan;Jeong, Hang-Geun
    • Journal of the Institute of Electronics Engineers of Korea SC
    • /
    • v.46 no.1
    • /
    • pp.63-67
    • /
    • 2009
  • Current mismatch in a charge pump causes degradation in spectral purity of the phase locked loops(PLLs), such as reference spurs. The current mismatch can be reduced by increasing the output resistance of the charge pump, as in a cascoded output stage. However as the supply voltage is lowered, it is hard to stack transistors. In this paper, a new method for reducing the current mismatch is proposed. The proposed method is based on a feed-forward compensation for the channel length modulation effect of the output stage. The new method has been demonstrated through simulations on typical $0.18{\mu}m$ CMOS circuits.

A Study on the Sensitivity Compensation of Three-dimensional Acoustic Intensity Probe in the Higher Frequency Range (3차원 음향 인텐시티 프로브의 고주파 영역 감도 보상 연구)

  • Kim, Suk-Jae;Hideo, Suzuki;Kim, Chun-Duck
    • The Journal of the Acoustical Society of Korea
    • /
    • v.13 no.5
    • /
    • pp.40-50
    • /
    • 1994
  • In this paper, the sensitivity compensation method for three-dimensional acoustic intensity probe in the higher frequency range has been studied. The measurement error in the higher frequency range is generated from the phase mismatch between microphone's signals of the probe. If the wavelength of sound signal measured is less than those of the distance between microphones of the probe, that is, the higher frequency of the sound signal, the bigger measurement error is generated. In this study, we proposed the compensation methods for one-dimensional acoustic intensity probe with two-microphones, and the efficiency of those methods were investigated by numerical calculation of computer. It was most effective method to compensate the phase mismatch between microphone for the acoustic intensity probe was investigated for the sound estimated. and the efficiency of this method in a three-dimensional probe was investigated for the sound wave travelling in the arbitrary direction by numerical calculation of computer. In this result, the efficiency was proved that, for the measurement error of 1dB or less with the three-dimensional probe of 60mm space, the frequency should be less than 1.2kHz without the error compensation method, but the frequency increased up to 2.8kHz with the error compensation method.

  • PDF

A Study On The Voltage transfer compensator for solving mismatch of oldage PV module string (노후 태양광모듈 스트링의 부정합 해소를 위한 전압보상기에 관한 연구)

  • Na, Jeong-Seong;Song, Gwang-Cheol
    • Journal of the Korean Society of Industry Convergence
    • /
    • v.21 no.2
    • /
    • pp.71-78
    • /
    • 2018
  • In this paper, we propose the performance enhancement of solar individual string power generation system using booster power control for voltage compensation. The proposed control method determines the variable voltage for the compensator using direct power control (DPC) modeling applied to motion factor estimation. This method also maintains excellent dynamic response to the characteristics of direct power control (DPC) by calculating the mismatch ratio of the arrestered PV modules. The validity of the proposed algorithm is verified through simulation and experiments.

A 10-bit D/A Converter with a Self Compensation Circuit (오차보정기능을 갖는 10비트 D/A 변환기)

  • Kim, Ook;Yang, Jung-Wook;Kim, Min-Kyu;Kim, Suk-Ki;Kim, Won-Chan
    • Journal of the Korean Institute of Telematics and Electronics A
    • /
    • v.31A no.6
    • /
    • pp.98-106
    • /
    • 1994
  • To realize high accuracy and high speed we developed a new self compensation scheme and applied it to a 10-bit D/A converter. This circuit can compensate the device mismatch without interrupting the D/A converter operation. With the compensation circuit,INA decreased down to 0.22LSB from 0.47LSB. The device was fabricated using a 0.8$\mu$m CMOS process. The area of the D/A converter core is 3.2mm$^{2}$ and the area of the compensation part is 0.64mm$^{2}$.

  • PDF

Surface-Mountable 10 Gbps Photoreceiver Module Using Inductive Compensation Method

  • Kim, Sung-Il;Hong, Seon-Eui;Lim, Jong-Won;Moon, Jong-Tae
    • ETRI Journal
    • /
    • v.26 no.1
    • /
    • pp.57-60
    • /
    • 2004
  • We propose an inductive compensation method for a surface-mountable 10 Gbps photoreceiver module. Since many typical 10 Gbps photoreceiver modules consist of a photodetector and low-noise pre-amplifier, the impedance mismatch between the photodetector and pre-amplifier, as well as package parasitics, may reduce the frequency bandwidth. In this paper, we inserted an inductive component between the photodetector and pre-amplifier in order to create frequency bandwidth expansion. From the measurement results, we have found that the proposed technique can increase the -3 dB bandwidth about 4.2 GHz wider compared with an uncompensated module. And, from a bit-error rate (BER) test, we observed -15.7 dB sensitivity at $10^{-12}$ BER. This inductive compensation can be implemented easily and is compatible with common manufacturing processes of photoreceiver modules.

  • PDF