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WO2015064796A1 - Dispositif écouteur capable de délivrer en sortie une source sonore optimisée pour des caractéristiques auditives personnelles - Google Patents

Dispositif écouteur capable de délivrer en sortie une source sonore optimisée pour des caractéristiques auditives personnelles Download PDF

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Publication number
WO2015064796A1
WO2015064796A1 PCT/KR2013/009848 KR2013009848W WO2015064796A1 WO 2015064796 A1 WO2015064796 A1 WO 2015064796A1 KR 2013009848 W KR2013009848 W KR 2013009848W WO 2015064796 A1 WO2015064796 A1 WO 2015064796A1
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WO
WIPO (PCT)
Prior art keywords
sound source
pressure level
characteristic information
hearing
sound
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/KR2013/009848
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English (en)
Korean (ko)
Inventor
윤정순
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CHUNGTEC Co Ltd
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CHUNGTEC Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by CHUNGTEC Co Ltd filed Critical CHUNGTEC Co Ltd
Priority to PCT/KR2013/009848 priority Critical patent/WO2015064796A1/fr
Publication of WO2015064796A1 publication Critical patent/WO2015064796A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
    • H04R1/1091—Details not provided for in groups H04R1/1008 - H04R1/1083
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2430/00—Signal processing covered by H04R, not provided for in its groups
    • H04R2430/01—Aspects of volume control, not necessarily automatic, in sound systems

Definitions

  • the present invention relates to an earphone device, and more particularly, in an earphone device for outputting a sound source provided from a sound source providing device, wherein the sound source is reproduced at a sound pressure level for each frequency optimized for hearing of a user using the earphone device.
  • the present invention relates to an earphone device that enables the output of a sound source optimized for the hearing characteristics of an individual who can provide a customized earphone device that reflects an individual's hearing difference.
  • a multimedia player for reproducing a video or a sound source such as an MP3 player, a smart phone, and a smart tap is recognized as a necessity of modern man, and recently, an earphone device such as a headphone is connected to the multimedia player so that the multimedia player is played.
  • the sound source output from the system is output.
  • the average hearing characteristics of a person has a good hearing sensitivity to hear a small sound centered on the 3.5kHz frequency, sound of a frequency higher or lower than the 3.5kHz frequency
  • the sound sensitivity is relatively poor at, and the hearing sensitivity is good at 3.5 kHz, so it is easy to listen without increasing the sound pressure, and the sound pressure is higher because the hearing sensitivity is lower for sounds of higher or lower frequencies.
  • a sound source that is output from a sound source providing device such as a multimedia playback device to a person having a hearing sensitivity modified by an influence of a personal sound environment, that is, a congenital factor, a disease, a work environment, or a music listening habit. If it is played, the inspiration for it will vary greatly.
  • the earphone device such as headphones, to adjust the volume of the sound linearly for all frequencies without taking into account the hearing characteristics of each individual having a different sensitivity for each frequency, to listen to the sound source
  • the inspiration of the user of the earphone device is not heightened.
  • Patent Publication No. 10-2009-82776 by measuring the hearing threshold for each individual frequency band and adjust the equalizer based on the measured hearing threshold, the optimal sound and hearing protection function It has been disclosed to provide
  • a sound source providing device having an optimal sound and hearing protection function listens to a sound source by another person having different hearing characteristics than the user of the sound source providing device, the other person may have a different hearing characteristic due to different hearing characteristics. Since it is not possible to feel the inspiration for the sound source, it is troublesome to release the corresponding function and setting environment of the preset sound source providing device, and then set the corresponding function and setting environment corresponding to the hearing characteristics of another person.
  • the user using the corresponding sound source providing device is mostly used alone, so that a plurality of sound sources are configured to output sound sources optimized for the hearing characteristics of the user to the earphone device. Even if a device is connected to a single earphone device to listen to a sound source, a method for allowing an optimized sound source reflecting a corresponding hearing characteristic to be heard is emerging.
  • an object of the present invention is that the sound source provided from the sound source providing device is reproduced in a state adjusted to correspond to the sound pressure for each frequency optimized for the hearing of the user using the earphone device, my own customized earphone device reflecting the individual hearing difference It is to provide an earphone device that enables the output of the sound source optimized for the hearing characteristics of the individual can be provided.
  • the hearing characteristic information setting unit receives the hearing characteristic data corresponding to the sound pressure level optimized for audible frequency by the hearing characteristic information collecting device and processes the same, and sets and stores the hearing characteristic information of the individual as the hearing characteristic information setting unit;
  • a sound source characteristic information generation unit for generating sound source characteristic information after detecting a sound pressure level for each frequency of the sound source when the sound source is provided from the sound source providing apparatus; After comparing the sound source characteristic information and the hearing characteristic information, the sound pressure level is adjusted by adding or subtracting the sound pressure level so that the sound pressure level for each frequency included in the sound source characteristic information corresponds to the sound pressure level optimized for the frequency included in the hearing characteristic information.
  • An equalizing unit configured to perform an equalizing process on a sound pressure level of a sound source based on the sound pressure level adjustment information
  • a sound source output unit configured to output the equalized sound source through a speaker
  • an earphone device is provided that enables the output of the sound source optimized for the hearing characteristics of the individual including a control unit for controlling the components.
  • the hearing characteristic data indicates that when a user selects a sound pressure level that is most audible using an individual's hearing when an audible sound pressure level for each frequency corresponding to a standard isotropic curve is represented as an optimized sound pressure level for the corresponding frequency. It is preferable.
  • the hearing characteristic information setting unit receives the hearing characteristic data while being connected to the hearing characteristic information collecting device through an interface, and generates and processes the hearing characteristic information indicating the sound pressure level at which audible frequency is optimized. It is then preferable to store it in the memory means.
  • the sound source characteristic information generation unit detects the sound pressure level for each frequency of the sound source provided at the time of reproducing the sound source, while being connected to the sound source providing apparatus via an interface, and displays the sound pressure characteristic for each frequency in real time. It is preferable to process.
  • the sound pressure level adjusting unit is connected to the sound source providing apparatus via an interface, the sound pressure level for each frequency included in the sound source characteristic information is close to the sound pressure level optimized for the audible frequency set in the hearing characteristic information.
  • the controller may enable the selection and control of the operation mode A, which enables the output of the sound source optimized for the hearing characteristics of the individual, and the operation, B, which enables the output of the sound source that does not reflect the hearing characteristics of the individual. It is preferable.
  • the sound source providing apparatus When a sound source is provided from the sound source characteristic information generator, the sound pressure level for each frequency of the sound source is detected so that sound source characteristic information is generated, and the sound source characteristic information and the hearing characteristic information are compared by the sound pressure level adjusting unit. Then, the equalizing unit and the sound source output unit are generated such that sound pressure level adjustment information is added or reduced so that the sound pressure level is adjusted so that the sound pressure level for each frequency included in the sound source characteristic information corresponds to an optimized sound pressure level for the audible frequency included in the hearing characteristic information. It is desirable to output sound sources optimized for the hearing characteristics of the individual.
  • the operation mode B when a sound source is provided from the sound source providing apparatus, it is preferable to output the sound source that does not reflect the hearing characteristics of the individual through the equalizing unit and the sound source output unit.
  • Figure 2 is a block diagram showing the configuration of the earphone device that enables the output of the sound source optimized for the hearing characteristics of the individual according to a preferred embodiment of the present invention
  • FIG. 3 is a diagram illustrating a graph of hearing characteristic information generated and set based on the hearing characteristic data of an individual
  • FIG. 5 is a diagram illustrating a graph of sound pressure level adjustment information whose sound pressure level is adjusted such that the sound source characteristic information of FIG. 4 corresponds to the hearing characteristic information of FIG. 3;
  • FIG. 6 is a control flow diagram illustrating the operation of the earphone device to enable the output of the sound source optimized for the hearing characteristics of the individual according to an embodiment of the present invention.
  • FIG. 1 is a graph showing a standard isotropic curve.
  • Figure 2 is a block diagram showing the configuration of the earphone device that enables the output of the sound source optimized for the hearing characteristics of the individual according to a preferred embodiment of the present invention
  • Figure 3 is generated and set based on the hearing characteristics data of the individual
  • FIG. 4 is a diagram illustrating a graph of hearing characteristic information
  • FIG. 4 is a diagram illustrating a graph of sound source characteristic information of a sound source provided from a sound source providing means
  • FIG. 5 is the sound source characteristic information of FIG.
  • FIG. 1 is a diagram illustrating a graph of sound pressure level adjustment information in which sound pressure levels are adjusted to correspond to the characteristic information.
  • 6 is a control flowchart illustrating the operation of the earphone device to enable the output of the sound source optimized for the hearing characteristics of the individual according to the preferred embodiment of the present invention.
  • the earphone device 100 that enables the output of the sound source optimized for the hearing characteristics of the individual according to a preferred embodiment of the present invention, the collection of hearing characteristics information, such as a PC or smart phone
  • the hearing characteristic information setting unit 110 receives the hearing characteristic data corresponding to the sound pressure level optimized for the audible frequency corresponding to the frequency from the device 10, that is, the sound pressure level most audible for the corresponding frequency, and stores the hearing characteristic data as personal hearing characteristic information.
  • Sound source characteristic information generation unit 120 for detecting sound pressure level for each frequency of a sound source and generating the sound source characteristic information when the sound source is provided from the sound source providing apparatus 20 such as MP3, smart phone, etc., the sound source characteristic information and hearing characteristic After comparing the information, apply the sound pressure level so that the sound pressure level for each frequency included in the sound source characteristic information corresponds to the optimized sound pressure level for the audible frequency for the frequency included in the hearing characteristic information.
  • Sound pressure level adjusting unit 130 for generating sound pressure level adjustment information, an equalizing unit 140 for performing an equalization process for sound pressure level based on the sound pressure level adjustment information, and a sound source output for outputting the equalized sound source through a speaker
  • the controller 150 and the controller 160 for controlling the components in a state electrically connected to the components 150, and the like.
  • the hearing characteristic information setting unit 110 receives the hearing characteristic data corresponding to the sound pressure level optimized for the audible frequency of the user's individual from the hearing characteristic information collecting device 10 and processes the hearing characteristic data of the individual after hearing the personal characteristic information.
  • the hearing characteristic data is received from the hearing characteristic information collecting device 10 while being connected to the hearing characteristic information collecting device 10 through a wireless interface such as a USB interface or Bluetooth.
  • the audible frequency corresponding to the frequency is processed and generated by hearing characteristic information indicating an optimized sound pressure level and then stored in the memory means.
  • the hearing characteristic information collecting device 10 is a PC or a smart phone including a display unit, an audio output terminal, a data input unit, etc., and a series of combinations of a frequency and a sound pressure level through a hearing characteristic information collecting program or application. Generate and display the sound pattern and the visual pattern through the display unit, and provides the pattern to the corresponding interface of the hearing characteristic information setting unit 110 through the audio output terminal to be output through the speaker of the sound source output unit 150, When the patterns are output from the input button of the earphone device 100 or the like, the data input unit measures and generates hearing characteristic data of the user.
  • the hearing characteristic information collecting device 10 generates a series of sound patterns and visual patterns for the combination of the corresponding frequency and sound pressure level, as shown in the standard isotropic curve of FIG. After providing to the user of the earphone device 100 through the visible and audible, so that different sound pressure level for each frequency is audible so that the user is optimized for the hearing characteristics of the individual, that is, the sound pressure level that can be heard most well by the corresponding input button or earphone
  • the measurement is generated as the hearing characteristic data, and the hearing characteristic information setting unit 110 of the earphone device 100 is provided through the corresponding interface.
  • the sound source characteristic information generation unit 120 is a means for generating sound source characteristic information after detecting and processing sound pressure levels for each frequency of a sound source when the sound source is provided from the sound source providing apparatus 20 such as an MP3 or a smart phone.
  • the providing device 20 is communicatively connected through a wireless interface such as a jack interface or a Bluetooth
  • a sound pressure level for each frequency of a sound source provided upon reproducing a sound source is detected, as shown in FIG.
  • Real time processing is performed with sound source characteristic information indicating sound pressure level.
  • the sound source characteristic information generation unit 120 preferably decodes the sound source by the codec to detect the sound pressure level for each frequency of the sound source as a quantitative value in real time.
  • the sound source providing apparatus 20 is an MP3 or smart phone including a display unit, an audio output terminal, a data input unit, and the like, and displays a sound source characteristic indicating a frequency and a sound pressure level of the corresponding sound source through a sound source playback program or application.
  • the sound source characteristics are provided to the corresponding interface of the sound source characteristic information generation unit 120 through the audio output terminal or output through the speaker of the sound source output unit 150, and the earphone unit 100 of the earphone device 100 is displayed.
  • the corresponding control that is, selection, reproduction, stop, forward, backward, volume output, etc. of the sound source is performed.
  • the sound pressure level adjusting unit 130 compares the sound source characteristic information and the hearing characteristic information, and so that the sound pressure level for each frequency included in the sound source characteristic information corresponds to the sound pressure level for which the audible for each frequency included in the hearing characteristic information is optimized.
  • the audible frequency per audio set in the hearing characteristic information is adjusted to be close to or coincident with the optimized sound pressure level, and is processed in real time with sound pressure level adjustment information indicating the sound pressure level added / decreased value for the corresponding frequency as shown in FIG. 5.
  • the sound pressure level adjustment information is 80dB when the sound source characteristic information is 100Hz, 60dB when 1000Hz, 75dB when 10kHz as shown in Figure 4, 80dB when the hearing characteristic information is 100Hz as shown in FIG. , 50dB at 1000Hz, 80dB at 10kHz, the sound pressure level deceleration at 100Hz of the sound source characteristic information is set to 0dB, the sound pressure level deceleration at 1000Hz to -10dB and the sound pressure at 10kHz A sound pressure level decrement for each frequency of the reproduced sound source for setting the level deceleration value to +5 dB is included.
  • the equalizing unit 140 is an equalizing means for performing an equalization process for the sound pressure level based on the sound pressure level adjustment information. Smoothing means for compensating the sound pressure level of the sound source of the sound pressure level adjustment information according to the transmission characteristic of the speaker. And the like, which are known in the art, and thus detailed descriptions thereof will be omitted.
  • the sound source output unit 150 is a means for outputting the equalized sound source through a speaker, which is a well-known technology, and thus a detailed description thereof will be omitted.
  • the control unit 160 is a control means for controlling the corresponding components in a state electrically connected to the components, through the operation mode button configured separately in the earphone device 100 of the sound source optimized for the hearing characteristics of the individual It is possible to select and control the A operation mode that enables the output and the B operation mode that enables the output of the sound source that does not reflect the personal hearing characteristics.
  • the operation mode A is an operation mode in which the earphone device 100 can output a sound source optimized for the hearing characteristics of the individual, and the operation of the sound source characteristic information generation unit 120 and the sound pressure level adjusting unit 130 is performed.
  • the hearing characteristic data corresponding to the sound pressure level optimized for the audible for each frequency from the hearing characteristic information collecting device 10 such as a PC or a smart phone is first heard by the hearing characteristic information setting unit 110.
  • the sound source is provided from the sound source providing apparatus 20 such as an MP3 or a smart phone after being stored as the characteristic information
  • the sound source characteristic information is detected by the sound source characteristic information generation unit 120 to detect the sound pressure level for each frequency of the sound source.
  • the sound pressure level adjusting unit 130 compares the sound source characteristic information with the hearing characteristic information, and then the sound pressure level for each frequency included in the sound source characteristic information is included in the hearing characteristic information.
  • the sound pressure level adjustment information of the sound pressure level is added or reduced so as to correspond to the optimized sound pressure level by the classification, it is possible to output the sound source optimized for the hearing characteristics of the individual through the equalizing unit 140 and the sound source output unit 150 Let's do it.
  • a custom earphone device 100 can be provided so that the inspiration for the sound source is heightened.
  • the A operation mode is set in the earphone device 100, the sound source optimized for the hearing characteristics of the user is output by the earphone device 100 itself regardless of the sound source providing device 20. Even if the plurality of sound source providing apparatuses 20 are used, the user can listen to the optimized sound source reflecting the hearing characteristics of the individual without separately setting the hearing characteristic information of the individual.
  • the operation mode B is an operation mode that enables the output of the sound source that does not reflect the hearing characteristics of the individual, the operation of the sound source characteristic information generation unit 120 and the sound pressure level adjustment unit 130 is not controlled,
  • the sound source providing device 20 such as an MP3 or a smart phone
  • the sound source output is not reflected through the equalizing unit 140 and the sound source output unit 150.
  • the sound source characteristic information provided by the corresponding function and setting preset in the sound source providing device 20 instead of the customized earphone device 100 of my own, so that the other person is the earphone device ( 100) can be used to listen to the sound source without inconvenience.
  • the hearing characteristic corresponding to the sound pressure level of the user's individual audible frequency optimized from the hearing characteristic information collecting device 10 in the hearing characteristic information setting unit 110 of the earphone device 100 is optimized.
  • the hearing characteristic data is set and stored as the hearing characteristic information indicating the sound pressure level for which the audible for each frequency is optimized as shown in FIG. 3 (S100).
  • steps S120 to S150 are performed by the controller 160.
  • the sound pressure level for each frequency of the sound source is detected by the sound source characteristic information generation unit 120, as shown in FIG. It is processed in real time with sound source characteristic information indicating the sound pressure level for each frequency (S120).
  • the sound pressure level adjusting unit 130 compares the sound source characteristic information with the hearing characteristic information, and then the sound pressure level for each frequency included in the sound source characteristic information corresponds to the sound pressure level for which the audible frequency is included in the hearing characteristic information.
  • the sound pressure level is added and subtracted, and as shown in FIG. 5, the sound pressure level is processed in real time with sound pressure level adjustment information indicating the sound pressure level added / decreased value for each frequency (S130).
  • the sound source output unit 150 reproduces the sound through the speaker. It is output (S150).
  • the steps S140 and S150 are performed by the controller 160.
  • the sound source provided from the sound source providing device 20 is reproduced in a state adjusted to correspond to the sound pressure for each frequency optimized for the hearing of the user using the earphone device 100, the hearing difference of the individual You can provide your own custom earphone device reflecting this.
  • the sound source provided from the sound source providing device is reproduced in a state adjusted to correspond to the sound pressure for each frequency optimized for the hearing of the user using the earphone device to my own customized earphone device reflecting the individual hearing difference It is possible to provide an earphone device that enables the output of the sound source optimized for the hearing characteristics of the individual that can be provided.
  • the hearing characteristic information optimized for hearing of the user of the earphone device is set inside the earphone device, and the sound pressure level for each frequency of the sound source provided from the sound source providing device corresponds to the sound pressure level for each frequency of the hearing characteristic information.
  • the customized sound source suitable for the hearing characteristics of the earphone device user may be reproduced.
  • the operation setting as described above is made inside the earphone device, so that the sound source optimized for the hearing characteristics of the user is output by the earphone device itself regardless of the sound source providing device so that a plurality of sound source providing devices are separately used. It is possible to listen to the optimized sound source reflecting the hearing characteristics of the individual without setting the hearing characteristics information.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Circuit For Audible Band Transducer (AREA)

Abstract

La présente invention concerne un dispositif écouteur capable de délivrer en sortie une source sonore optimisée pour des caractéristiques auditives personnelles. Ledit dispositif écouteur comprend : une unité de définition d'informations de caractéristique auditive servant à recevoir, d'un dispositif de collecte d'informations de caractéristique auditive, des données de caractéristique auditive correspondant à un niveau de pression sonore optimisé pour être audible pour chaque fréquence correspondante, à traiter les données de caractéristique auditive reçues et à définir et stocker le résultat du traitement en tant qu'informations de caractéristique auditive personnelle ; une unité de génération d'informations de caractéristique de source sonore servant à détecter un niveau de pression sonore pour chaque fréquence d'une source sonore lorsque la source sonore est fournie par un dispositif de fourniture de source sonore, à traiter le niveau de pression sonore détecté et à générer des informations de caractéristique de source sonore ; une unité d'ajustement de niveau de pression sonore servant à comparer les informations de caractéristique de source sonore aux informations de caractéristique auditive et à générer des informations d'ajustement de niveau de pression sonore par une hausse ou une baisse d'un niveau de pression sonore de sorte que le niveau de pression sonore pour chaque fréquence qui est comprise dans les informations de caractéristique de source sonore, corresponde au niveau de pression sonore optimisé pour être audible pour chaque fréquence qui est comprise dans les informations de caractéristique auditive ; une unité d'égalisation servant à réaliser un traitement d'égalisation pour le niveau de pression sonore sur la base des informations d'ajustement de niveau de pression sonore ; une unité de sortie de source sonore servant à sortir par le biais d'un haut-parleur la source sonore ayant subi le traitement d'égalisation ; et une unité de commande servant à commander les éléments constitutifs.
PCT/KR2013/009848 2013-11-01 2013-11-01 Dispositif écouteur capable de délivrer en sortie une source sonore optimisée pour des caractéristiques auditives personnelles Ceased WO2015064796A1 (fr)

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PCT/KR2013/009848 WO2015064796A1 (fr) 2013-11-01 2013-11-01 Dispositif écouteur capable de délivrer en sortie une source sonore optimisée pour des caractéristiques auditives personnelles

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PCT/KR2013/009848 WO2015064796A1 (fr) 2013-11-01 2013-11-01 Dispositif écouteur capable de délivrer en sortie une source sonore optimisée pour des caractéristiques auditives personnelles

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080137873A1 (en) * 2006-11-18 2008-06-12 Personics Holdings Inc. Method and device for personalized hearing
KR100842618B1 (ko) * 2005-11-01 2008-06-30 삼성전자주식회사 음악 파일 재생 방법 및 장치
WO2008117999A1 (fr) * 2007-03-28 2008-10-02 Jonghae Kim Système de téléphone mobile multifonctionnel
KR100925022B1 (ko) * 2007-04-30 2009-11-04 주식회사 크리스틴 청력도 기반의 음질보정 음향출력장치
KR100995611B1 (ko) * 2008-05-02 2010-11-22 권대훈 사용자 개인별 청음능력을 기반으로 하는 컨텐츠 운영시스템

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100842618B1 (ko) * 2005-11-01 2008-06-30 삼성전자주식회사 음악 파일 재생 방법 및 장치
US20080137873A1 (en) * 2006-11-18 2008-06-12 Personics Holdings Inc. Method and device for personalized hearing
WO2008117999A1 (fr) * 2007-03-28 2008-10-02 Jonghae Kim Système de téléphone mobile multifonctionnel
KR100925022B1 (ko) * 2007-04-30 2009-11-04 주식회사 크리스틴 청력도 기반의 음질보정 음향출력장치
KR100995611B1 (ko) * 2008-05-02 2010-11-22 권대훈 사용자 개인별 청음능력을 기반으로 하는 컨텐츠 운영시스템

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