• Title, Summary, Keyword: audio device

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An advertisement method using inaudible sound of speaker

  • Chung, Myoungbeom
    • Journal of the Korea Society of Computer and Information
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    • v.20 no.8
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    • pp.7-13
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    • 2015
  • Recently, there are serviced user customized advertisement of various type using smart device. Representative services are advertisement service using light of smart TV screen or audible sound of smart TV to transmit advertisement information. However, those services have to do a specific action of smart device user for advertisement information or need audible audio information of TV contents. To overcome those weakness, therefore, we propose an advertisement method using inaudible sound of speaker based on smart device. This method supports the transfer of advertising content to the smart device user with no additional action or TV audio signal required to access that content. The proposed method used two high frequencies among 18kHz ~ 22kHz of audible frequency range which smart TV can send out. And it generates those frequencies synthesized with audio of TV contents as trigger signal which can send advertisements to smart device. Next, smart device analysis the trigger signal and request advertisement contents related to the signal to server. After then, smart device can show the downloaded contents to user. Because the proposed method uses the high frequencies of sound signals via the inner speaker of the smart device, its main advantage is that it does not affect the audio signal of TV content. To evaluate the efficacy of the proposed method, we developed an application to implement it and subsequently carried out an advertisement transmission experiment. The success rate of the transmission experiment was approximately 97%. Based on this result, we believe the proposed method will be a useful technique in introducing a customized user advertising service.

The Noise Influence of 4G Mobile Transmitter on Audio Devices (4G 휴대 단말기 송신에 의한 오디오 잡음 영향)

  • Yun, Hye-Ju;Lee, Il-Kyoo
    • Journal of Satellite, Information and Communications
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    • v.8 no.1
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    • pp.31-34
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    • 2013
  • This paper deals with the interfering audio noise caused by LTE(Long Term Evolution) UE(User Equipment) which is 4th generation mobile communications on audio devices. At first, we realized that the interfering signal of the LTE UE is determined by the transmit power of the LTE UE through analysis and measurement. Then, we performed to measure audio noise level according to the variation of transmitting power level and separation distance between the LTE UE and an audio device. As a result, it is required that minimum separation distance should be 25 cm and above in order to protect audio device from the interference noise of the LTE UE with the maximum transmit power level of 22 dBm.

Design and Implementation of a CX23880 based PCI Multichannel Video/Audio Capture Device (CX23880 기반 PCI 다채널 비디오/오디오 캡쳐 장치 설계 및 구현)

  • 백승걸;홍진기;정선태
    • Proceedings of the IEEK Conference
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    • pp.2148-2151
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    • 2003
  • In this paper, we present our experiences in designing and implementing a CX23880 based multichannel video/audio capture device. We try to clarify differences between CX2388x family and 878A, the previous version of Cx2388x, and what one needs to be careful about in developing device drivers for CX2388x based video/audio devices. Our work is expected to help one who will need to develop Cx2388x based video/audio device later.

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A Beamforming-Based Video-Zoom Driven Audio-Zoom Algorithm for Portable Digital Imaging Devices

  • Park, Nam In;Kim, Seon Man;Kim, Hong Kook;Kim, Myeong Bo;Kim, Sang Ryong
    • IEIE Transactions on Smart Processing and Computing
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    • v.2 no.1
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    • pp.11-19
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    • 2013
  • A video-zoom driven audio-zoom algorithm is proposed to provide audio zooming effects according to the degree of video-zoom. The proposed algorithm is designed based on a super-directive beamformer operating with a 4-channel microphone array in conjunction with a soft masking process that uses the phase differences between microphones. The audio-zoom processed signal is obtained by multiplying the audio gain derived from the video-zoom level by the masked signal. The proposed algorithm is then implemented on a portable digital imaging device with a clock speed of 600 MHz after different levels of optimization, such as algorithmic level, C-code and memory optimization. As a result, the processing time of the proposed audio-zoom algorithm occupies 14.6% or less of the clock speed of the device. The performance evaluation conducted in a semi-anechoic chamber shows that the signals from the front direction can be amplified by approximately 10 dB compared to the other directions.

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Smart Phone Based Infrared Remote Controller without Restriction of Target Devices (대상 기기에 제한이 없는 스마트폰 기반의 적외선 리모컨)

  • Hwang, Seong-Jin;Lee, Mi-Hyun;Hong, Jeong-Pyo;Park, Tae-Geun;Kim, Yong-Seok
    • Journal of Industrial Technology
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    • v.34
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    • pp.27-32
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    • 2014
  • Infrared remote controllers are widely used in controlling electronic devices due to its simplicity and convenience. This paper presents a smart phone application unifying any infrared remote controllers. We can select a device from device list menu of the application. Any new device can be added easily by downloading the protocol file of the device from protocol file server. Remote controller protocol files are stored in audio file format, and the file related to a specific menu button is transmitted through the audio jack of smart phones. The protocol file server is a standard file server, and protocol files for various devices are collected by infrared receiver module. For smart phones without infrared facility, a small infrared module translating audio signal to infrared signal is applied.

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Study of DRM Application for the Portable Digital Audio Device (휴대용 디지털 오디오 기기에서의 DRM 적용에 관한 연구)

  • Cho, Nam-Kyu;Lee, Dong-Hwi;Lee, Dong-Chun;J. Kim, Kui-Nam;Park, Sang-Min
    • Convergence Security Journal
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    • v.6 no.4
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    • pp.21-27
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    • 2006
  • With the introduction of sound source sharing over the high speed internet and portable digital audio, the digitalization of sound source has been rapidly expanded and the sales and distribution of sound sources of the former offline markets are stagnant. Also, the problem of infringement of copyright is being issued seriously through illegal reproduction and distribution of digitalized sound sources. To solve these problems, the DRM technology for protecting contents and copyrights in portable digital audio device began to be introduced. However, since the existing DRM was designed based on the fast processing CPU and network environment, there were many problems in directly applying to the devices with small screen resolution, low processing speed and network function such as digital portable audio devices which the contents are downloadable through the PC. In this study, the DRM structural model which maintains similar security level as PC environment in the limited hardware conditions such as portable digital audio devices is proposed and analyzed. The proposed model chose portable digital audio exclusive device as a target platform which showed much better result in the aspect of security and usability compared to the DRM structure of exiting portable digital audio device.

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A Study on the Improvement of Test and Diagnosis Device for Audio Frequency Track Circuit (가청주파수 궤도회로의 진단 및 시험 장비 개선에 대한 연구)

  • Kang, Jang-Kyu;Kim, Jae-Chul
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.24 no.12
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    • pp.147-155
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    • 2010
  • We studied on performance improvement of TTM(TI21 Test Meter) that is test and diagnosis devices for jointless audio frequency track circuit on Korean electric railway TI21 standard. Upgraded devices is AD-TTM(Advanced TI21 Test Meter). This can measure alternating frequency USB(Upper signal band) and LSB(Lower signal band). In the audio frequency track circuit, ${\pm}17[Hz]$ of nominal frequency are demodulated and supplied to track relay through AND gate. It is important that measurement function which is error between USB and LSB. Need of AD-TTM will stand out in the electric railway system because this is simple and accurate rather than the former device.

Development of portable game device with uncompressed HD video and high quality sound output (비압축 HD급 영상 및 고음질 음성 출력을 지원하는 휴대용 게임기 구현)

  • Lee, Chung-Hee;Lee, Jong-Hun;Jung, Woo-Young
    • Proceedings of the KIEE Conference
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    • pp.391-393
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    • 2006
  • In this paper, we develop a portable game device with uncompressed HD video and high quality sound output. Portable game devices support not only game function but also various complex functions recently. It especially supports TV-Out port to play realistic game, connecting a large screen display device. But the video and audio output signals of conventional TV-out port have the low performance and these signals are analog output. So, it is difficult that the users enjoy realistic game with benefit of high resolution digital TV. We propose the game device output with uncompressed digital signal, which has no delay of video/audio signal, also has strong immunity to external noise. Since it supports a high resolution video and high quality sound, users can playa realistic game. First, we implement the HDMI to the game device and we test reliability with the various resolutions video inputs and audio inputs. The proposed method can be applied multimedia devices requiring high performance output function as well as portable devices.

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Design of a New Audio Watermarking System Based on Human Auditory System (청각시스템을 기반으로 한 새로운 오디오 워터마킹 시스템 설계)

  • Shin, Dong-Hwan;Shin Seung-Won;Kim, Jong-Weon;Choi, Jong-Uk;Kim, Duck-Young;Kim, Sung-Hwan
    • The Transactions of the Korean Institute of Electrical Engineers D
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    • v.51 no.7
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    • pp.308-316
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    • 2002
  • In this paper, we propose a robust digital copyright-protection technique based on the concept of human auditory system. First, we propose a watermarking technique that accepts the various attacks such as, time scaling, pitch shift, add noise and a lot of lossy compression such as MP3, AAC WMA. Second, we implement audio PD(portable device) for copyright protection using proposed method. The proposed watermarking technique is developed using digital filtering technique. Being designed according to critical band of HAS(human auditory system), the digital filers embed watermark without nearly affecting audio quality. Before processing of digital filtering, wavelet transform decomposes the input audio signal into several signals that are composed of specific frequencies. Then, we embed watermark in the decomposed signal (0kHz~11kHz) by designed band-stop digital filer. Watermarking detection algorithm is implemented on audio PD(portable device). Proposed watermarking technology embeds 2bits information per 15 seconds. If PD detects watermark '11', which means illegal song. PD displays "Illegal Song" message on LCD, skips the song and plays the next song, The implemented detection algorithm in PD requires 19 MHz computational power, 7.9kBytes ROM and 10kBytes RAM. The suggested technique satisfies SDMI(secure digital music initiative) requirements of platform3 based on ARM9E core.

Audio Signal Processing and System Design for improved intelligibility in Conference Room (회의실의 명료성(STI) 향상을 위한 오디오신호 처리 및 시스템 설계)

  • Kang, Cheolyong;Lee, Seokjoo;Jo, Kwangyeon;Lee, Seonhee
    • The Journal of The Institute of Internet, Broadcasting and Communication
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    • v.17 no.2
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    • pp.225-232
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    • 2017
  • Recently, the development of digital transmission technology of audio signals and the introduction of audio network equipment using digital transmission technology have been made. As a result, audio network technology and equipment are actively applied to the design and construction of audio systems. The meeting room is a place where a large number of participants exchange opinions and communicate with each other. In addition to using an electric acoustic device such as a microphone and a speaker, it improves the intelligibility of the conference room through an example using an audio network.