• Title/Summary/Keyword: Stereophonic Sound System

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Implementation of Stereophonic Sound System Using Multiple Smartphones (여러 대의 스마트폰을 이용한 입체 음향 시스템 구현)

  • Kim, Ki-Jun;Myeong, Chang-Ho;Park, Hochong
    • Journal of Broadcast Engineering
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    • v.19 no.6
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    • pp.810-818
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    • 2014
  • In this paper, we propose a stereophonic sound system using multiple smartphones. In the conventional sound systems using smartphones, all devices play the same signal so that it is difficult to provide true stereophonic effect. In order to solve this problem, we propose a novel sound system which can generate a virtual sound source at any location in such a way that smartphones at different locations play different signals with amplitude panning. By using the proposed system, we can generate more realistic stereophonic effect than the conventional system, and can control the sound effect by user's command. We developed the proposed system using commercial smartphones and verified that the developed sound system effectively provides the desired stereophonic effect.

Research for Characteristic of Directional Sound Image Idealization at Stereo System Using Different Phase Pure Tone (순음의 위상차를 이용한 스테레오 시스템에서의 음상 정위 특성 연구)

  • 한찬호;이법기;정원식;고일석;최영수
    • The Journal of the Korea Contents Association
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    • v.2 no.1
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    • pp.32-38
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    • 2002
  • In the AV system, stereophonic system has been studied to produce a realistic sound effect. The width of stereo AV system speakers is narrow, to have the spatial impression of sound effect, widening the sound image is necessary. The direction of sound image depends on the phase delay and the sound pressure level difference between two channels. In this paper, we analyze the relationship between the phase delay and the direction of the sound image relating to the frequency of sound source. Also we experimented to directionally localize the sound image of the pure tone with shifting phases and controling sound pressure love between two channels when the sound is reproduced by two speakers to make a spatial impression of sound effect.

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Computer Simulation on the Modelling of OSS Equalizer for the Reproduction of Original Sound Field (원음장 재생을 위한 OSS 등화기의 모델링에 관한 컴퓨터시뮬레이션)

  • 임정빈;김천덕
    • Journal of the Korean Institute of Navigation
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    • v.16 no.4
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    • pp.55-63
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    • 1992
  • This computer simulation is the basic research for realize a real-time hardware of the reproduction system in original sound field with two loudspeakers based on the OSS(Ortho Stereophonic System) method which was proposed by Hamada of Japan in 1983. Through the computer simulation, presumed the system function of OSS equalizer using HRTF(Head Related Transfer Function), constructed the model of OSS equalizer and , evaluated the modelling OSS equalizer by evaluation formula. The obtained results are summarized as follows : 1) By the modelling OSS equalize operate as inverse filter of HRTF, an input signal reproduced effectively. 2) Known that the real-time hardware of OSS equalizer can be made by the fast convolution between the impulse response of OSS equalizer and input speech signal. 3) Since the system function of OSS equalizer presumed from HRTF, the study on the measuring of HRTF have to proceed.

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A Design and Analysis on Performance of Wireless Home Theater System (무선 전송방식의 홈시어터 설계 및 이의 성능 분석)

  • Kang, Kyoung-Won
    • Proceedings of the IEEK Conference
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    • 2007.07a
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    • pp.181-182
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    • 2007
  • Wireless home theater and speaker system was designed. That has 20W output per channel, 0.1% THD (Total Harmonic Distortion) and automatic algorithm avoiding noise. The 3D stereophonic sound was realized through the wireless 5.1channel speaker system designed. That could be secured 0.4% improvement effect of THD compared with wire speaker systems. Specially in transfer sound with wireless, Frequency Hopping Spread Spectrum was superior than Direct Sequence Spread Spectrum in household electric appliances and wireless internet environment that radiated noise similar with ISM Band using 2.4GHz.

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Sweet Spot Analysis of Linear Array System with a Large Number of Loudspeakers by Geometrical Approach Method (다수의 스피커를 사용하는 선형 배열 시스템에서 기하학적 접근 방법을 통한 스윗 스팟 분석)

  • Yang, Hunmin;Park, Youngjin;Park, Youn-Sik
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.23 no.11
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    • pp.951-956
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    • 2013
  • This paper describes techniques used to analyze the sweet spot of sound field reproduced by ear-level linear arrays of loudspeakers by geometrical approach method. Previous researches have introduced various sweet spot definitions in their own way. In general, sweet spot is defined as an area whose stereophonic sound effect is valid. Its size is affected by the geometrical arrangement of the system. In this paper, a case when plane waves are generated by linear arrays of loudspeakers in the horizontal plane is considered. So the sweet spot is defined as an area in which the listener can perceive the desired azimuth angle. Because there are many loudspeakers, impulse responses at listener's ears are in the form of pulse-train and the time-duration of the pulse-train affects the localization performance of the listener. So we calculated the maximum time duration of pulse-train by geometrical approach method and identified with the results of impulse response simulation. This paper also includes parameter analysis with respect to aperture size, so it suggests a tool for sound engineers to expect the sweet spot size and listener's sound perception.

A Tracking of Head Movement for Stereophonic 3-D Sound (스테레오 입체음향을 위한 머리 움직임 추정)

  • Kim Hyun-Tae;Lee Kwang-Eui;Park Jang-Sik
    • Journal of Korea Multimedia Society
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    • v.8 no.11
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    • pp.1421-1431
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    • 2005
  • There are two methods in 3-D sound reproduction: a surround system, like 3.1 channel method and a binaural system using 2-channel method. The binaural system utilizes the sound localization principle of a human using two ears. Generally, a crosstalk between each channel of 2-channel loudspeaker system should be canceled to produce a natural 3-D sound. To solve this problem, it is necessary to trace a head movement. In this paper, we propose a new algorithm to correctly trace the head movement of a listener. The Proposed algorithm is based on the detection of face and eye. The face detection uses the intensity of an image and the position of eyes is detected by a mathematical morphology. When the head of the listener moves, length of borderline between face area and eyes may change. We use this information to the tracking of head movement. A computer simulation results show That head movement is effectively estimated within +10 margin of error using the proposed algorithm.

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A study on the simplification of HRTF within high frequency region (고역 주파수 영역에서 HRTF의 간략화에 관한 연구)

  • Lee, Chai-Bong
    • Journal of the Institute of Convergence Signal Processing
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    • v.12 no.1
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    • pp.1-6
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    • 2011
  • In this study, we investigated the effect of the simplification for high frequency region in Head-Related Transfer Function(HRTF) on the sound localization. For this purpose, HRTF was measured and analyzed. The result in the HRTF frequency characteristic of the back sound source showed that the decrease revel of high frequency was smaller than that of low frequency region, which means the possibility of simplification in the high frequency region. Simplification was performed by flattening of the high frequency amplitude characteristics with the insertion of the low-pass filter, whose cutoff frequency is given by boundary frequency. Auditory experiments were performed to evaluate the simplified HRTF. The result showed that direction perception was not influenced by the simplification of the frequency characteristics of HRTF for the error of sound localization. The rate of confusion for the front and back was not affected by the simplification of the frequency characteristics over 8kHz of HRTF. Finally, we made it clear that the sound localization was not affected by the simplification of frequency characteristics of HRTF over 8kHz.

The Present State and Future Prospect on Standardization about Multichannel Audio - on the viewpoint of ITU-R (멀티채널 오디오 표준화 현황과 전망 - ITU-R을 중심으로)

  • Yoo, Jae-hyoun;Lee, Taejin;Kang, Kyeongok
    • Proceedings of the Korean Society of Broadcast Engineers Conference
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    • 2013.11a
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    • pp.147-150
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    • 2013
  • UHDTV 시스템의 개발로 오디오에서도 보다 몰입감 있는 멀티채널 오디오 시스템에 대한 관심이 높아지고 있다. 이에, 과거 ITU-R에서 표준이 제정되어 극장 및 HDTV 등에 폭넓게 활용되어 온 5.1채널 대비 elevation 채널을 포함한 더 많은 채널 수를 사용하여 청취자에게 궁극의 몰입감을 줄 수 있는 멀티채널 오디오 시스템이 여러 표준화 단체를 통해 논의되고 있다. 이에 본 논문에서는 ITU-R에서 이루어지는 Advanced Multichannel Stereophonic Sound System 표준화 논의를 중점적으로 살펴보기 위하여, ITU-R의 구성과 현재까지 논의된 이슈 및 앞으로의 전망 등에 대해서 논하고자 한다.

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Real-time Implementation of Dolby Pro Logic Decoder Using ARM-7 Core (ARM-7 코어를 이용한 Dolby Pro Logic 복호기의 실시간 구현)

  • 이창우;이상근;조재문
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.24 no.8B
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    • pp.1412-1420
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    • 1999
  • In order to enhance multi-channel audio signals, Dolby Pro Logic is widely used especially for the Hi-Fi audio system, since it can provide highly stereophonic effects and a nice separation of multi-channel sound. This paper describes an implementation of Dolby Pro Logic decoder with ARM-7 core. The code is modified for the fixed point operation and optimized. For the verification of the code, the operation time and the precision are estimated thoroughly. As a result, it is verified that Dolby Pro Logic decoder can be implemented with ARM-7 core operating at 54 MHz.

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Attentional Effects of Crossmodal Spatial Display using HRTF in Target Detection Tasks (항공 목표물 탐지과제 수행에서 머리전달함수(HRTF)를 이용한 이중감각적 공간 디스플레이의 주의효과)

  • Lee, Ju-Hwan
    • Journal of Advanced Navigation Technology
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    • v.14 no.4
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    • pp.571-577
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    • 2010
  • Driving aircraft requires extremely complicated and detailed information processing. Pilots perform their tasks by selecting the information relevant to them. In this processing, spatial information presented simultaneously through crossmodal link is advantageous over the one provided in singular sensory mode. In this paper, probability to apply providing visual spatial information along with auditory information to enemy tracking system in aircraft navigation is empirically investigated. The result shows that auditory spatial information, which is virtually created through HRTF is advantageous to visual spatial information alone in attention processing. The findings suggest auditory spatial information along with visual one can be presented through crossmodal link by utilizing stereophonic sound such as HRTF. which is available in the existing simple stereo system.