• Journal of the Korea Institute of Information and Communication Engineering
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• v.15 no.7
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• pp.1487-1494
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• 2011

In this paper, a novel genre classification algorithm is proposed for music recommendation system. Especially, to improve the classification accuracy, the band-pass filter for octave-based spectral contrast (OSC) feature is designed considering the psycho-acoustic model and actual frequency range of musical instruments. The GTZAN database including 10 genres was used for 10-fold cross validation experiments. The proposed multiple-octave based OSC produces better accuracy by 2.26% compared with the conventional OSC. The combined feature vector based on the proposed OSC and mel-frequency cepstral coefficient (MFCC) gives even better accuracy.

• The Journal of the Acoustical Society of Korea
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• v.14 no.6
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• pp.32-39
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• 1995

This paper describes a method of musical frequency estimation using tree structured octave band filter banks and the constant Q spectral transform. The performances of the proposed method are compared with those of the conventional constant Q transform using FFT. The performances are evaluated by the estimated fundamental frequency, varying the bandwidth and the frequency resolutions. The results are as follows. With the same frequency resolution of the conventional constant Q transform using FFT, the proposed method gives the better time resolutions, thus, the limit of the processing bandwidth is removed. And, when the bandwidth and the frequency resolution are set high for more accurate results, the computational complexity of the proposed method is less than that of the conventional one.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.15 no.6
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• pp.239-244
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• 2015

Recently, Impulse radars using UWB technologies are widely use for measuring distance, or for transmitting uncompressed high resolution videos. However, since the UWB band spans over octave bands, it is not easy to design such a system. Wide band impedance matching is required for antennas and other RF area. In this study, we designed and fabricated sinuous antenna for 3~6 GHz octave band application. We also designed and attached a dielectric lens to improved the directional gain of the antenna. The gain of the antenna was 6~10 dBi. The dielectric lens attached sinuous antenna was used to transmit HD video data. The maximum reach distance was 90 meter with 10mW power.

• Journal of the Korean Society for Railway
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• v.10 no.5
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• pp.463-472
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• 2007

In this paper, the correlation between the vibration characteristics of the track components and the parameters affecting the vibration is analysed. To do it, the accelerations of each track component such as rails, sleepers and ballast are measured in Kyong-Bu high-speed line. The RMS values of the measured data are calculated and the pad stiffness, the longitudinal irregularity, running velocity and the corrugation, are considered as the parameters in the viewpoint of track. By using the linear regression, the correlation coefficient is calculated to analyse the relationship. Also, the 1/3 Octave analysis is calculated to analyse the dominant frequency band of tile vibrations of the track components.

• Smart Media Journal
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• v.8 no.2
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• pp.16-20
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• 2019

Fast Fourier Transform in the vibration acceleration analysis system has recently been utilized in the field of sensor measurement. In this paper, we propose a Fast Fourier Transform based method of detecting the normal frequency among the many frequency types of diffuse field. This normal frequency is expressed by the formula of frequency damping recognition which is calculated in a similar way to the octave center frequency. Based on this theory, this paper can more accurately inform noise producers of the degree of damping, which is different from the vibration type of diffuse field.

• 프린팅코리아
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• v.14 no.7
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• pp.74-87
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• 2014

최근 인터넷에서는 숫자 12의 비밀이 화제였다. 우리 일상생활에서 흔히 찾아볼 수 있는 숫자 12에 굉장히 많은 비밀이 있다는 것이다. 서양의 문화인 그리스 신화에 등장하는 신과 성경 속 예수의 제자는 각각 12명이다. 동양에는 12간지 12마리의 동물이 띠를 이룬다. 피아노의 건반은 한 옥타브가 12개의 반음으로 이뤄져 있다. 연필 한 다스에는 연필 12자루가 들어있고, 일반적인 축구공 한 개에는 12개의 정오각형이 들어 있다. 우리가 가장 많이 쓰는 컴퓨터 키보드는 F1부터 F12까지 12개의 기능키가 있다. 하루는 24시간으로 오전과 오후 12시간으로 나뉘며, 1년은 12개월이다.

• The Journal of the Acoustical Society of Korea
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• v.11 no.1E
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• pp.64-72
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• 1992

본 연구는 음장의 주관 확산감과 관련있는 두 귀에 입사하는 신호의 상호상관도와 청각유발 반 응과의 관계를 밝히기 위한 것이다. 실험은 중신 주파수가 500Hz인 1/3옥타브 대역잡음을 이용하여 IACC를 0.95에서 0.1까지 가변시키면서 AER을 기록하였다. IACC와 주관확산감과의 함수 결과와 비교 하기 위하여 기준음과 테스트음의 쌍을 교대로 제시하면서 AER을 청각 부위에서 기록하였다. 그 결과 테스트음에 대해 IACC와 관련된 정보는 AER의 반응시간에 나타났고, IACC의 크기가 감소함에 따라 반응시간이 길어지는 경향이 나타났다. 여기에서 IACC와 AER의 반응시간과는 선형관계를 나타냈다. 이 결과는 청각계에서 음장의 IACCDP 반응하는 뉴런이나 메카니즘이 존재하는 것을 암시하고 있음을 알 수 있다.

• Information and Communications Magazine
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• v.23 no.3
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• pp.23-34
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• 2006

정부 BcN의 1차년도 시범사업에 참여한 KT 옥타브 컨소시움에서는 고객이 요구할 것으로 판단되는 서비스를 선별하여 영상 단말기반으로 다양한 통합서비스를 제공하였다. KT의 BcN은 NGN의 핵심표준인 IMS구조를 기반으로 구축하였으나, 보다 광범위한 BcN서비스 지원구조로써는 부족하고 상이한 면이 있다. 본 논문에서는 KT BcN 서비스의 종류. 구조를 IMS 표준에 비교하여 기술하고, 대표적인 시나리오, 시범사업결과 및 향후방향에 대해서 정리하였다.

• Science of Emotion and Sensibility
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• v.15 no.2
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• pp.231-238
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• 2012

This study aims for building an application system of converting sound into color image based on synesthetic perception. As the major features of input sound, both scale and octave elements extracted from F0(fundamental frequency) were converted into both hue and intensity elements of HSI color model, respectively. In this paper, we used the fixed saturation value as 0.5. On the basis of color model conversion theory, the HSI color model was then converted into the RGB model, so that a color image of the BMP format was finally created. In experiments, the basic system was implemented on both software and hardware(TMS320C6713 DSP) platforms based on the proposed sound-color image conversion method. The results revealed that diverse color images with different hues and intensities were created depending on scales and octaves extracted from the F0 of input sound signals. The outputs on the hardware platform were also identical to those on the software platform.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.15 no.4
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• pp.789-794
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• 2011

A coaxial-cable impedance transformer used in wideband frequency range is generally restricted to the fixed impedance transformation ratio as n2:1 or 1:n2(n: the number of coaxial cables). In this paper, we propose a new coaxial-cable impedance transformer to have an arbitrary impedance transformation ratio. We have fabricated three impedance transformers($50-{\Omega}$ to $25-{\Omega}$, $50-{\Omega}$ to $20-{\Omega}$ and $50-{\Omega}$ to $9-{\Omega}$) to confirm the operation characteristic of the suggested impedance transformer. The reflection characteristics (S11) of the fabricated $50-{\Omega}$ to $25-{\Omega}$ and $50-{\Omega}$ to $20-{\Omega}$ impedance transformer were less than -15dB over about 3-octaves frequency range and the reflection characteristic (S11) of the fabricated $50-{\Omega}$ to $9-{\Omega}$ impedance transformer was less than -15dB over about 1-octave frequency range, respectively.