• Title/Summary/Keyword: TV Noise

Search Result 223, Processing Time 0.024 seconds

A Study on the Power Level Measurement and Evaluating Vocabulary of H.D. TV Sets -Focused on LCD·PDP Tv Sets- (고화질 TV Set의 음향 파워 레벨 측정 및 평가 어휘 선정에 관한 실험적 연구 - LCD·PDP TV Set를 중심으로 -)

  • Lee, Tai-Gang;Park, Hyeon-Ku;Lee, Ju-Yeob;Lee, Jai-Cheon;Shin, Jong-Keun;Kim, Hye-Jin;Kim, Sun-Woo
    • Transactions of the Korean Society for Noise and Vibration Engineering
    • /
    • v.15 no.9 s.102
    • /
    • pp.1092-1099
    • /
    • 2005
  • This experimental study deals with the characteristics of LCD or PDP TV set noise, which are differ form those of CRT TV set. These characteristics are most important for establishing the effective method to reduce noise level, searching for the appropriate exposure level and evaluation method of LCD or PDP TV set noise. This study adopt two measurement method to specify the power level of LCD or PDP TV set noise in anechoic room(ISO 3741) and reverberation room(ISO 3745) . Comparing with each results of the two method, the reverberation room method is more simple in measuring and calculating the power level. And the subjective response test are carried out to select the pair of appropriate adjectives to present the characteristics of LCD or PDP TV set noise. The pair of 17 adjectives are selected from the 168 adjectives which are used in presenting the sound and noise form literature.

Reference Channel Input-Based Speech Enhancement for Noise-Robust Recognition in Intelligent TV Applications (지능형 TV의 음성인식을 위한 참조 잡음 기반 음성개선)

  • Jeong, Sangbae
    • Journal of the Korea Institute of Information and Communication Engineering
    • /
    • v.17 no.2
    • /
    • pp.280-286
    • /
    • 2013
  • In this paper, a noise reduction system is proposed for the speech interface in intelligent TV applications. To reduce TV speaker sound which are very serious noises degrading recognition performance, a noise reduction algorithm utilizing the direct TV sound as the reference noise input is implemented. In the proposed algorithm, transfer functions are estimated to compensate for the difference between the direct TV sound and that recorded with the microphone installed on the TV frame. Then, the noise power spectrum in the received signal is calculated to perform Wiener filter-based noise cancellation. Additionally, a postprocessing step is applied to reduce remaining noises. Experimental results show that the proposed algorithm shows 88% recognition rate for isolated Korean words at 5 dB input SNR.

An Experimental Study on the Noise and Vibration Characteristics of LCD TV Inverter (LCD TV 인버터 소음 및 진동 특성의 실험적 연구)

  • You, Chung-Jun
    • Transactions of the Korean Society for Noise and Vibration Engineering
    • /
    • v.18 no.9
    • /
    • pp.982-989
    • /
    • 2008
  • There is a noticeable hum from the inverter board of LCD TV when in operation. In this study, we investigate the source and the characteristics of this noise for the inverter board of LCD TV using measurement of vibration and noise. Modal analysis of vibration and noise is visualized for identification of noise sources and transmission vibration. The main source of noise was the transformer of the LCD TV inverter. A noise reduction was achieved by damping the structural elements.

Noise Reduction of PDP TV Using Multi-dimensional Spectral Analysis Method (다차원 스펙트럼 해석법을 이용한 PDP TV의 저소음화)

  • Yang, In-Hyung;Jeong, Jae-Eun;Kwak, Hyung-Taek;Oh, Jae-Eung
    • Transactions of the Korean Society for Noise and Vibration Engineering
    • /
    • v.21 no.1
    • /
    • pp.81-88
    • /
    • 2011
  • The method is introduced for estimating the noise source contribution on the noise of PDP TV in a multiple-input system where the input sources may be coherent with each other. By the coherence function method, it is found that the biggest part of the noise source in the PDP TV noise is generated by the PCB boards which consume high power and produce high heat. This analysis is modeled as three-input/single-output system because the noise is generated by three main boards, X-board, Y-board, SMPS that are located close to each other. The coherence function method is proved to be useful tool for identifying of noise source. In this study, Transfer Path Analysis using MDSA is implemented to determine the quantitative noise contribution of each board for PDP TV with the rear case closed and with the rear case open. And the possibility of noise reduction is confirmed through the experimental method that isolates the most contributing board by adding sound-absorbing materials to it.

A Design Approach of TV Set for Reducing Noise Induced from Speaker (TV set의 스피커에 의한 소음 대책 설계)

  • 김재환;김종연;이중근;이동호;곽순찬;박상덕;최진성;박종성
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • 1998.04a
    • /
    • pp.561-567
    • /
    • 1998
  • Recently, TV makers have tried for high sound quality and power, However, due to the high power of the speaker the structure of set brings about a sound vibration problem. Therefore, this paper illustrates the sound vibration phenomenon for a monotype TV set and suggests guide lines for reducing the sound vibration in the design of TV sets,

  • PDF

An Experimental Study on the noise Rating of H.D. TV sets by Psycho-acoustic Experiments (청감실험을 통한 고화질 TV set 소음평가에 관한 실험적 연구)

  • Lee, Ju-Yeob;Park, Hyeon-Ku;Lee, Tai-Gang;Kim, Hye-Jin;Kim, Sun-Woo
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • 2006.05a
    • /
    • pp.862-869
    • /
    • 2006
  • The purpose of this study is to propose the proper vocabularies for evaluating H.D TV set fan noise in residential condition. To achieve this goal, psycho-acoustic experiments were carried out with TV set fan noise modulated at specific frequency band. finally, a correlation analysis between vocabularies, and a factor analysis of psycho-acoustical responses were conducted. As a result of this study, followings are suggested. Analyzing the psycho-acoustical response corresponding to the various sound level, the higher the sound levels, the higher the response values were. It is estimated that the sound level determined psycho-acoustical responses. On the degree of response to fan noise, the initial level of negative feeling is located on $35{\sim}40$ dB(A). The factor of evaluating H.D. TV set fan noise has induced three the appropriate korean adjectives; Irritate, Monotonous, stuffy and dryness. The result of this study may be used to evaluate the acoustic threshold level for indoor noise or a basis for specifying the desired acoustic environment of dwellings.

  • PDF

An Experimental Study on the Noise Evaluation of H.D. TV sets by Psycho-acoustic Experiments (청감실험을 통한 고화질 TV set 소음평가에 관한 실험적 연구)

  • Lee, Ju-Yeob;Lee, Tai-Gang;Kim, Hye-Jin;Kim, Sun-Woo
    • Transactions of the Korean Society for Noise and Vibration Engineering
    • /
    • v.16 no.10 s.115
    • /
    • pp.1014-1023
    • /
    • 2006
  • The purpose of this study is to propose the proper vocabularies for evaluating H.D TV set fan noise. To achieve this goal, psycho-acoustic experiments were carried out with TV set fan noise modulated at specific frequency band. Finally, a correlation analysis between vocabularies, and a factor analysis of psycho-acoustical responses were conducted. As a result of this study, followings are suggested. Analyzing the psycho-acoustical response corresponding to the various sound level, the higher the sound levels, the higher the response values were. It is estimated that the sound level determined psycho-acoustical responses. On the degree of response to fan noise, the initial level of negative feeling is located on $35{\sim}40$ dB(A). The factor of evaluating H.D. TV set fan noise has induced three the appropriate korean adjectives; Irritate, Monotonous, stuffy and dryness. The result of this study may be used to evaluate the acoustic threshold level for indoor noise or a basis for specifying the desired acoustic environment of dwellings.

Noise Reduction of PDP TV Cooling Fan System through Parameter Analysis (인자 분석을 통한 플라즈마 디스플레이 패널(Plasma Display Panel) 텔레비전에서의 냉각 홴 시스템 소음 저감)

  • Kim, Kyu-Young;Choi, Min-Goo;Lee, Duck-Joo
    • Transactions of the Korean Society for Noise and Vibration Engineering
    • /
    • v.16 no.2 s.107
    • /
    • pp.107-114
    • /
    • 2006
  • The present experimental study deals with noise reduction and improvements in cooling performance in a plasma display panel (PDP) television (TV). The main ideas of the fan system noise reduction are maintenance of uniform inflow condition and reduction of the system loss, ${\Delta}P.$ The discrete noise is mainly related with the inflow condition therefore removing the structure which distorts inflow makes the discrete noise reduction. The broadband noise in PDP TV is related with the system losses which result from the presence of the fan downstream obstacle, PDP rear case. Through the modification of the distance and preventing the leakage flow between the fan and rear case, we can obtain the system loss and broadband noise reduction. Additionally we can reduce fan rotating speed because of increased flow rate which obtains from the reduction of system loss (resistance). Finally, 4.2 dB(A) noise reduction and $10\%$ increase in flow rate are achieved. From these results, we show that the reduction of system loss is the most effective way of the fan system noise reduction.

The Effects of Total Variation (TV) Technique for Noise Reduction in Radio-Magnetic X-ray Image: Quantitative Study

  • Seo, Kanghyen;Kim, Seung Hun;Kang, Seong Hyeon;Park, Jongwoon;Lee, Chang Lae;Lee, Youngjin
    • Journal of Magnetics
    • /
    • v.21 no.4
    • /
    • pp.593-598
    • /
    • 2016
  • In order to reduce the amount of noise component in X-ray imaging system, various reduction techniques were frequently used in the field of diagnostic imaging. Although the previous techniques -such as median, Wiener filters and Anscombe noise reduction technique - were able to reduce the noise, the edge information was still damaged. In order to cope with this problem, total variation (TV) noise reduction technique has been developed and researched. The purpose of this study was to evaluate and compare the image quality using normalized noise power spectrum (NNPS) and contrast-to-noise ratio (CNR) through simulations and experiments with respect to the above-mentioned noise reduction techniques. As a result, not only lowest NNPS value but also highest CNR values were acquired using a TV noise reduction technique. In conclusion, the results demonstrated that TV noise reduction technique is proved as the most practical method to ensure accurate denoising in X-ray imaging system.

VOICE CONTROL SYSTEM FOR TELEVISION SET USING MASKING MODEL AS A FRONT-END OF SPEECH RECOGNIZER

  • Usagawa, Tsuyoshi;Iwata, Makoto;Ebata, Masanao
    • Proceedings of the Acoustical Society of Korea Conference
    • /
    • 1994.06a
    • /
    • pp.991-996
    • /
    • 1994
  • Surrounding noise often affects the performance of speech recognition system when it is used in office or home. Especially situation is more serious when colored and nonstational noise such as an sound from television or other audio equipment is introduced. The authors proposed a voice control system for television set using an adaptive noise canceler, and it works well even is sound of television set has comparable level of speech. In this paper, a new front-end of speech recognition is introduced for the voice control system. This font-end utilizes a simplified masking model to reduce the effect of residual noise. According to experimental results, 90% correct recognition is achieved even if the level of television sound is almost 15dB higher than one of speech.

  • PDF