• KSII Transactions on Internet and Information Systems (TIIS)
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• 제6권3호
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• pp.906-918
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• 2012

Wireless Fidelity (WiFi) and Wireless microphone are assumed to operate on adjacent channels in TV White Spaces(TVWS). The Scenario of WiFi potentially interfering with Wireless microphone is analyzed through Minimum Coupling Loss (MCL) and Spectrum Engineering Advanced Monte Carlo Analysis Tool (SEAMCAT) based on the Monte-Carlo simulation method. In the case of single WiFi interfering with Wireless microphone, the protection distance between WiFi and the Wireless microphone should be at least 25.12 m to avoid WiFi impact on Wireless microphone. When the active number of WiFi is 12, the guard band between WiFi and Wireless microphone should not be less than 4.97 MHz to guarantee that WiFi does not interfere with the Wireless microphone.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 1999년도 춘계종합학술대회
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• pp.248-253
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• 1999

본 논문은 국내에서 사용되고 있는 무선마이크의 기술적 조건 개정에 관한 것이다. 현행 기술기준의 개정을 하기 위해서 본 논문에서는 제 외국의 무선마이크 RF 규격을 소개하였으며, 인접대역을 사용하는 타 무선국과의 전파간섭을 분석하였다. 그리고 본 논문에서는 국내 주파수 환경에 따른 무선마이크의 기술적 조건의 개정 초안을 제안하였다.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2003년도 춘계학술대회 논문집 기술교육전문연구회
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• pp.96-102
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• 2003

Today, stage technology is developing highly by application of digital computer. Performance is composed of audio/video and acoustic technology takes very important position in field of stage technology. Generally speaking, four factors of sound are loudness, pitch, sound timbre and duration. Loudness depends on sound pressure level, yet partly related with spectrum and dulation. Pitch depends mainly on frequence and have a relation with sound pressure and duration. sound timbre depends strongly on spectrum and have a relation with frequence. In this paper, I designed a multi-microphone system which can used in broadcasting and performance stage with vicboss 200MHz-VHF wireless microphone and vicboss 900MHz-VHF wireless microphone. I also studied about multi-microphone which can use conveniently in the super play that needs many microphones. If this multi-microphone is prodused, we could expect better sound quality and a big progress in stereo recording technology.

• 한국멀티미디어학회논문지
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• 제18권5호
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• pp.652-662
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• 2015

It is necessary to develop small, implantable bio-telemetry systems which can measure and transmit patients' bio-signals from internal body to external receiver. When measuring bio-signals, like electrical bio-signals, acoustic bio-signal measurement has also a big clinical usefulness. But, sound signal has larger frequency bandwidth than any other bio-signals. When considering these issues, a wireless telemetry system which has rapid data transmission rate proportional to wide frequency bandwidth is necessary to be developed. The bluetooth module is used to overcome the data rate limitation caused by the large frequency bandwidth. In this paper, a novel multimedia bluetooth biotelemetry system was developed which consists of transmitter module located in the body and receiver device located outside of the body. The transmitter consists of microphone, bluetooth, and wireless charging device. And the receiver consists of bluetooth and codec system. The sound inside the skin is captured by microphone and sent to receiver by bluetooth while charging. The wireless charging system constantly supplies the electric power to the system. To verify the performance of the developed system, an in vitro experiment has been performed. The results show that the proposed biotelemetry system has ability to acquire the sound signals under the skin.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1998년도 제13차 학술회의논문집
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• pp.75-80
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• 1998

This paper proposes a novel computer human interface, named Virtual Wireless Microphone (VWM), which utilizes computer vision and signal processing. It integrates real-time face tracking and sound signal processing. VWM is intended to be used as a speech signal input method for human computer interaction, especially for autonomous intelligent agent that interacts with humans like as digital secretary. Utilizing VWM, the agent can clearly listen human master's voice remotely as if a wireless microphone was put just in front of the master.

• 말소리와 음성과학
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• 제16권2호
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• pp.49-58
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• 2024

본 연구에서는 정상음성사용자를 대상으로 음성검사를 위한 고가의 음성 녹음 장비인 Computerized Speech Lab(CSL) 대신 스마트폰에 적용 가능한 단일지향성 유선 핀마이크(WIRED), 스마트폰의 자체 내장 무지향성 마이크(SMART), 블루투스 무선 이어폰인 갤럭시 버즈2 프로(WIRELESS)로 녹음된 음성샘플의 음향학적 측정치를 비교하고자 하였다. 연구대상은 최근 3개월 이내 호흡기 질환으로 이비인후과에 내원한 적이 없는 정상성인 40명(남 12명, 여 28명)이었으며, 소음이 통제된 방음 부스에서 모음 /아/ 연장 발성(4초) 과제와 '산책' 문장, '가을' 문단 읽기 과제를 네 가지의 기기로 동시에 녹음하였다. 4종의 샘플들에 대하여 CSL 녹음을 기준으로 동기화 작업을 진행하였으며, MDVP와 ADSV, VOXplot 프로그램을 이용하여 분석하였다. 연구 결과, F0, shimmer, noise-to-harmonic ratio를 제외한 다른 변수들에서 유의미한 차이가 있었다. 특히 SR_V, SR_S, CSID_V, CSID_S, AVQI의 경우 CSL에 비해 WIRED의 CSID_V, CSID_S, AVQI 중증도가 낮았던 반면, SMART에서는 높게 나타났다. SR_V, SR_S의 경우 반대의 경향이 나타났으며, WIRELESS는 과제에 따라 다른 경향이 있었다. CSL과 다른 마이크 유형들은 동일한 변수 간에는 모두 양의 상관관계를 보였으며, F0와 CPP_V가 모든 유형에서 공히 강한 양의 상관관계를 보였다. ICC 또한 F0와 CPPV가 모두 0.9 이상으로 가장 높았다. 본 연구에서 사용된 마이크를 음향학적 분석을 위한 녹음 도구로 사용할 때, F0와 CPP_V의 경우 신뢰도 높은 분석 변수로 마이크 유형과 무관하게 포함할 수 있고, SR, CSID, AVQI의 경우 마이크 유형에 따라 분석 및 해석에 주의를 기울일 필요가 있을 것으로 판단된다.

• 한국기계가공학회지
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• 제10권6호
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• pp.33-38
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• 2011

We describe a research about remote control of mobile robot based on voice command in this paper. Through real-time remote control and wireless network capabilities of an unmanned remote-control experiments and Home Security / exercise with an unmanned robot, remote control and voice recognition and voice transmission are possible to transmit on a PC using a microphone to control a robot to pinpoint of the source. Speech recognition can be controlled robot by using a remote control. In this research, speech recognition speed and direction of self-driving robot were controlled by a wireless remote control in order to verify the performance of mobile robot with two drives.

• 대한의용생체공학회:의공학회지
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• 제43권2호
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• pp.124-130
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• 2022

In this paper, we proposed a portable electronic cardiogram and stethoscope (ECGS) that can simultaneously perform the electrocardiogram (ECG) and auscultation tests to increase the reliability of diagnosis of heart disease. To measure the ECG and heart sound (HS) at the same time, three ECG electrodes and a microphone sensor were combined into a triangular shape with a width of 90 mm and a height of 97 mm that can be held in one hand. In order to prevent skin problems when they contact the patient's skin, a capacitive coupled electrode was selected as the ECG electrode and a silicone material was used in a chest piece with the microphone sensor. For the signals measured from the electrodes and the chest piece, filters were respectively configured to pass only the signals of 0.01-100 Hz and 20-250 Hz, which are frequency bands for ECG and HS. The filtered ECG and HS analog signals were converted into digital signals and transmitted to a PC using wireless communication for monitoring them. The HS could be auscultated simultaneously using an earphone. The monitored ECG had an SNR of about 34 dB and a P-QRS-T waveform is clearly visible. In addition, the HS had an SNR of about 28 dB and both S₁ and S₂ are clearly visible. It is expected that it can aid doctors' inexperience in analyzing the ECG and HS.

• 한국생산제조학회지
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• 제20권2호
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• pp.207-213
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• 2011

In this paper, we present a study on the real-time implementation of mobile robot to which the interactive voice recognition technique is applied. The speech command utters the sentential connected word and asserted through the wireless remote control system. We implement an automatic distance speech command recognition system for voice-enabled services interactively. We construct a baseline automatic speech command recognition system, where acoustic models are trained from speech utterances spoken by a microphone. In order to improve the performance of the baseline automatic speech recognition system, the acoustic models are adapted to adjust the spectral characteristics of speech according to different microphones and the environmental mismatches between cross talking and distance speech. We illustrate the performance of the developed speech recognition system by experiments. As a result, it is illustrated that the average rates of proposed speech recognition system shows about 95% above.

• 한국산업융합학회 논문집
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• 제18권1호
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• pp.10-17
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• 2015

We describe a research about remote control of mobile robot based on voice command in this paper. Through real-time remote control and wireless network capabilities of an unmanned remote-control experiments and Home Security / exercise with an unmanned robot, remote control and voice recognition and voice transmission are possible to transmit on a PC using a microphone to control a robot to pinpoint of the source. Speech recognition can be controlled robot by using a remote control. In this research, speech recognition speed and direction of self-driving robot were controlled by a wireless remote control in order to verify the performance of mobile robot with two drives.