Hyung Woo Park

Comparison of acoustic quality according to the types of flat panel display: Direct drive with exciter speaker

With the technological improvements in the display industry, display panel manufacturers have changed the picture quality from simple high definition to augmented reality or virtual reality. In the previous research, the sound field implementation and sound quality improvement using organic light-emitting diode (OLED) flat panel was introduced. Recently, we have developed a technology for implementing sound in a drive even on a high-quality liquid crystal display. The LED panel has a multi-layer structure, and the backlight unit has a disadvantage of the wavelength transmission structure. In this study, we proposed a method to analyze LCD more effectively through previous studies. Also, we can play left channel and right channel like analysis 2 channel flat panel speakers with one panel. This flat panel speaker consists of direct drive actuator and diaphragm and is used as the outer glass layer of OLED and multilayer LCD. In the LCD panel, we configured the enclosure and adjusted the exciter for the output powers of the exciter were controlled to ensure. Furthermore, the vibration was transmitted to the last flat sheet. We also implemented a clear-sounding direct-drive exciter speaker flat panel display.

A study on the sound generation at digital signage using OLED panel

With the development of ICT technology and convergence of media and ICT, smart media is spreading to people. The advertising industry through this smart screen is a rapidly growing future industry in the world. A new paradigm of bidirectional/customized features advertisement has become provided through IP-based new media such as smart TVs, portable smart devices, the Internet, IPTV (VOD), and digital signage. As one of the smart advertising industries, the digital signage is attracting attention as the fourth screen after TV, PC, and mobile with indoor/outdoor advertisement using information display. Advertising using the digital signage is installed in a lot of floating population place such as a subway station, a bus stop, an elevator, etc. Digital signage is developed with the display technology and the convergence of IT technology, but the development of appearance and screen configuration is mainly made. There are characteristics of high efficiency when communicate information with visual and auditory. However, up until now, digital signage has been difficult to provide vision and sound to people at the same time. The sound must be played through the screen; nevertheless, the smart screen does not pass the sound well, because of hardware. In this study, we introduce the technology that can generate direct sound using the characteristics of organic light-emitting diode (OLED) panel and introduce digital signage that can transmit video and sound simultaneously by using direct sound generation.With the development of ICT technology and convergence of media and ICT, smart media is spreading to people. The advertising industry through this smart screen is a rapidly growing future industry in the world. A new paradigm of bidirectional/customized features advertisement has become provided through IP-based new media such as smart TVs, portable smart devices, the Internet, IPTV (VOD), and digital signage. As one of the smart advertising industries, the digital signage is attracting attention as the fourth screen after TV, PC, and mobile with indoor/outdoor advertisement using information display. Advertising using the digital signage is installed in a lot of floating population place such as a subway station, a bus stop, an elevator, etc. Digital signage is developed with the display technology and the convergence of IT technology, but the development of appearance and screen configuration is mainly made. There are characteristics of high efficiency when communicate information with visual and audito...

Study on multi-channel speakers for controlling sound field of flat panel display

Technological improvement in display industry, the organic light-emitting diode(OLED) panel manufacturer changed the quality of picture of the screen from simple high definition to an augmented-reality or a virtual-reality. And OLED that construct with the actual pixels and emit light by themselves are becoming widespread, making the thickness thinner and the bezel thinner or even disappearing. However, these technology improvement made it difficult to achieve sufficient performance in a small space for sound quality, which is less important component of TV. In this study, we have developed a multi-channel flat panel speaker which is able to synthesis the sound field. That flat panel speaker consist with direct drive actuator and diaphragm as an outer—glass layer of OLED. This direct drive actuator speakers are used to realize multi-channel sound from a single OLED panel. Multi-channel speakers can control the sound field to set the direction of sound. This feature is a good condition for implementing mix...

A study on voice enhancement using palm reflections

Peoples communicates with others using voice that is essayist way. Voice is a means of conveying your opinions or thoughts. In complex social life, voices become rough and tone changes due to various causes such as condition, stress, singing, effect of drugs and changing the pitch due to changes in the numerical value of hormones. This will result in the other party not being able to communicate. In order to solve this treatment from the hospital. In this paper, we introduce the phenomenon of improving the clarity of human voice by utilizing the reflected sound waves of the palm. In previous research, We proposed the methods that using voice recorded or a solid surface mug. In this study, we propose method that peoples own voice reflected from the palm of their vocal organ. Speak the voice for “ah,” “e,” “o”, “ooo” for a minute and make a sound wave in each mouth and massage it. The reflected voice from the palm stimulates delicate massage of the skin cells of the mouth, further enhancing the original voice enhancement function.

A study on the optimal speaker position for improving sound quality of flat panel display

As a technological improvement in display industry, flat panel manufacturers have changed the screen quality from simple high definition to 5 sensation satisfaction. The sound quality is improved, which is the easiest way to enhance the senses satisfaction. The technology, which in a previous meeting in Minneapolis, is using an exciter speaker. That is, the vibrate panel itself is used to make and play the sound for multimedia information. In this study, the optimum position of the exciter was studied to improve the sound quality of the proposed multi–channel flat–panel speaker. We studied the pattern of the acoustic energy emitted by the exciter and the position and the radiation pattern of the speaker to prevent distortion of the sound when watching the display from a distance. The panel encloses the exciter and the back plane. We also studied the method of construction.

Acoustic transfer characteristics study through the fingers vibrations using wrist vibrator

In these days, people are exposed in many kind of noise, such as machinery, aircraft, construction site, or road traffic. The noise is situated in one part of the modern life of human. In this study, we confirmed that the characteristics of acoustic transmission through the finger in noisy environment. To investigate the function of the sound transfer to ear, we measure the vibration from the wrist actuator fingertips to figure out the mechanisms of transmission. And we using the bone-conduction equivalent circuit for compensation with normal hearing and estimate the acoustic characteristics. The experiment of propose mechanism, set the noise environment with monitor speakers in semi-anechoic room and check the acoustic transfer performance.

A Study on the Improvement of Sound Quality According to the Location of OLED Flat Plate Speaker

With advances in electronics technology, the design of organic light emitting diode (OLED) panels, such as planar information displays, has been improved and their thicknesses have also been reduced. In particular, unlike an LCD (Liquid Crystal Display) information display device, an LED panel can reduce the number of layers constituting a screen, and can also reduce the thickness of each layer. Today, the development direction of the display device is focused on the appearance of the visible part, the aspect of the power efficiency, the quality of the image, and the like. But the part about the sound is being overlooked in the age of five-sense-satisfaction. However, the information display device is transferred from Received (October 20, 2017), Review Result (November 3, 2017) Accepted (November 10, 2017), Published (December 31, 2017) (Corresponding author)06978 Dept. Information & Telecommunication Engineering Soongsil University, Sangdo-ro 369, Dongjak-gu, Seoul, Republic of Korea email: pphw@ssu.ac.kr 2 06978 Dept. Information & Telecommunication Engineering Soongsil University, Sangdo-ro 369, Dongjak-gu, Seoul, Republic of Korea email : mjbae@ssu.ac.kr A Study on the Improvement of Sound Quality According to the Location of OLED Flat Plate Speaker Copyright c 2017 HSST 776 a CRT (Cathode Ray tube) to an LCD and from an LCD to an LED, and it is also possible to realize effects on high-quality direct sound. Conventional LCD monitors and TVs generally have a speaker in the downward direction or a sound from the rear to hear the reflected sound from the wall and the floor. In this study, we introduce the direct driving speaker which implements the sound by directly vibrating the information display glass layer on the LED panel, and show how to improve the sound quality of this flat panel display speaker. Using the LED glass panel as a diaphragm, it is confirmed that the sound quality is clear and the sound source can be reproduced effectively in a wide frequency band.

A Study on Improvement of Sound Quality through the Fingers vibration Acoustic Transfer

In these days, With the remarkable development of information and telecommunication technology today, it is easy to transfer information through portable information devices. When using mobile devices to transmit information, they are placed in various noisy environments. The noise environment is an environment that interrupts the sound of information by using electronic portable devices. In this case, the signal to noise ratio (SNR) can be obtained by comparing the magnitude of the signal generated by the information device with the magnitude of the noise. In previous studies, it has shown that the minimum SNR required for information transmission is 15 dB. Also in previous studies, we analyze the magnitude and type of environmental noise when using mobile devices has been it. In a quiet environment, the average noise level is less than 50 dB. The average of noisy environments is around 80 dB. This noise Received (April 11, 2017), Review Result (April 25, 2017) Accepted (May 2, 2017), Published (June 30, 2017) (Corresponding author) 09678 Dept. Information & Telecommunication Engineering Soongsil University, Sangdo-ro 369, Dongjak-gu, Seoul, Republic of Korea email: pphw@ssu.ac.kr 2 09678 Dept. Information & Telecommunication Engineering Soongsil University, Sangdo-ro 369, Dongjak-gu, Seoul, Republic of Korea email : mjbae@ssu.ac.kr A Study on Improvement of Sound Quality through the Fingers vibration Acoustic Transfer Copyright c 2017 HSST 890 occurs the hearing loss. And when using a portable information communication device, the sound generated from the device easily becomes 100dB. A sound of 100dB is a very dangerous sound that harms human hearing. In this study, we propose a method to improve the sound quality by analyzing the size and characteristics of sound when transmitting sound through finger vibration. keywords: Finger communication, Acoustic transmission by Finger, bone conduction device, Sound quality enhancing

A study of reliability parameters extracted through voice analysis

The human voice is one of the easiest methods for the information transmission between human beings. The characteristics of the voice can be varied by different people and different situations, such as utterance speed, pitch tone, vocal organ features, and the gender. Moreover, the voice can be used as a factor for deciding the personal credit rating scores. The reliable parameters of speech signal can be extracted from different characteristics of the spoken information. In this paper, we collected the voices from people who has relatively high personal credit scores, and analyzed them.

Effect of denture adhesives on enhancement pronunciation accuracy of denture wearers

People who have lost their natural teeth for any reason need to wear dentures (false teeth in other words) to eat and talk. And the teeth chewing role, and also has an important role in having the pronunciation. However, when people wear a denture, it causes some problems such as aesthetic or pronunciation. Among denture users, pronunciation errors may occur depending on how bonded and which location of false teeth inside of our mouth. In this paper, a comparative analysis on the bandwidth of formant frequency found in pronunciation errors is utilized in order to analyze pronunciation errors caused by different positions of dentures and thus evaluate the accuracy of pronunciation for each position. In the experiment result, that show the pronunciation accuracy enhancing around 5%, when using adhesives, who use denture correctly. And accuracy of pronunciation is evaluated differently depending on the position of dentures.