WO2001006668A1 - Detachable wireless earphone/microphone device - Google Patents

Detachable wireless earphone/microphone device Download PDF

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Publication number
WO2001006668A1
WO2001006668A1 PCT/KR2000/000783 KR0000783W WO0106668A1 WO 2001006668 A1 WO2001006668 A1 WO 2001006668A1 KR 0000783 W KR0000783 W KR 0000783W WO 0106668 A1 WO0106668 A1 WO 0106668A1
Authority
WO
WIPO (PCT)
Prior art keywords
audio signal
switching center
earphone
communication processor
user
Prior art date
Application number
PCT/KR2000/000783
Other languages
French (fr)
Inventor
Bong Yong Park
Original Assignee
Idea Park 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 Idea Park Co., Ltd. filed Critical Idea Park Co., Ltd.
Priority to AU60249/00A priority Critical patent/AU6024900A/en
Publication of WO2001006668A1 publication Critical patent/WO2001006668A1/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
    • H04M1/6033—Substation equipment, e.g. for use by subscribers including speech amplifiers for providing handsfree use or a loudspeaker mode in telephone sets
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/3827—Portable transceivers
    • H04B1/385—Transceivers carried on the body, e.g. in helmets
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/72—Mobile telephones; Cordless telephones, i.e. devices for establishing wireless links to base stations without route selection
    • H04M1/725—Cordless telephones
    • H04M1/72502—Cordless telephones with one base station connected to a single line
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/3827—Portable transceivers
    • H04B1/385—Transceivers carried on the body, e.g. in helmets
    • H04B2001/3866—Transceivers carried on the body, e.g. in helmets carried on the head

Definitions

  • the present invention relates in general to detachable wireless earphone/microphone devices, and more particularly to a detachable wireless earphone/microphone device which is detachably installable in any of general wired and wireless telephones.
  • a calling party establishes a call connection from either a wired or wireless telephone to another telephone (wired or wireless) of a desired subscriber number via a switching center of a telephone office to conduct a telephone conversation with a called party.
  • a general wired telephone has a disadvantage in that a handset is connected to the telephone body by wire, thereby localizing the user's movements to within a limited range.
  • a general wireless telephone has a disadvantage in that a handset is so large in volume that the user must hold it in either of his both hands to conduct a telephone conversation with a call-connected party. As a result, the user cannot help suspending the current work in progress to converse with the call-connected party over the telephone.
  • the present invention has been made in view of the above problems, and it is an object of the present invention to provide a detachable wireless earphone/microphone device which is capable of being detachably installed in any of general wired and wireless telephones so that the user can converse with a desired telephone subscriber over the telephone while having his both hands free.
  • a detachable wireless earphone/microphone device equipped with a general wired or wireless telephone system which includes a connector provided at its predetermined portion for receiving an incoming call signal from a switching center of a telephone office and allows the user to make a call to a telephone of a desired party by personally dialing a subscriber telephone number of the desired party, the device comprising a switching center connector for transmitting and receiving signals to/from the switching center; a communication processor for processing an audio signal from the user, outputting the processed result to the switching center connector, detecting an audio signal from the switching center from the switching center connector and processing the detected audio signal to reproduce it; a transmitter for transmitting the audio signal from the switching center, processed by the communication processor, at a first frequency; an earphone/microphone unit located remotely from the transmitter and wirelessly connected thereto, the earphone/microphone unit receiving and demodulating the audio signal of the first frequency transmitted from the transmitter, aurally providing the demodulated
  • the communication processor may be adapted to receive an audio signal from an external audio system, mix the received audio signal with the audio signal from the switching center and output the mixed result to the transmitter.
  • Fig. 1 is a perspective view illustrating a connection between a detachable wireless earphone/microphone device of the present invention and a general telephone; and Fig. 2 is a block diagram showing the construction of the detachable wireless earphone/microphone device of the present invention.
  • Fig. 1 is a perspective view illustrating a connection between a detachable wireless earphone/microphone device of the present invention and a general telephone
  • Fig. 2 is a block diagram showing the construction of the detachable wireless earphone/microphone device of the present invention.
  • the reference numeral 1 denotes a general wired or wireless telephone system which has a connector 2 provided at its predetermined portion for receiving an incoming call signal from a switching center of a telephone office.
  • the user can make a call to a telephone of a desired party over the wired or wireless telephone system 1 by personally dialing a subscriber telephone number of the desired party.
  • the detachable wireless earphone/microphone device of the present invention comprises a detachable communication system body 4 connected to the connector 2.
  • the detachable communication system body 4 is adapted to process the incoming call signal from the switching center of the telephone office, transmit the processed result through an antenna and receive an audio signal from the user.
  • An audio connector 6 is provided at a predetermined side portion of the detachable communication system body 4 to receive an audio signal from an external audio system.
  • a detachable earphone/microphone unit 21 is detachably installed in a predetermined top portion of the detachable communication system body 4 to receive a signal transmitted from the body 4, aurally provide the received signal to the user, convert the user's voice into an electrical audio signal and transmit the converted audio signal to the body 4.
  • a power supply 19 is connected to the 1/06668
  • a 4 detachable communication system body 4 to convert a commercial voltage of AC 220V or 110V into a predetermined DC voltage and supply the converted DC voltage to the body 4.
  • An audio jack 14 is inserted into the audio connector 6 to transfer the audio signal from the external audio system to the detachable communication system body 4.
  • a switching center connector 5 is further provided in the detachable communication system body 4 to transmit an outgoing call signal to the switching center and receive the incoming call signal therefrom.
  • the detachable communication system body 4 includes the switching center connector 5 and a communication processor 13.
  • the switching center connector 5 is adapted to transmit the outgoing call signal to the switching center and receive the incoming call signal therefrom.
  • the communication processor 13 functions to process the audio signal from the user and output the processed result to the switching center connector 5.
  • the communication processor 13 further functions to detect an audio signal from the switching center from the switching center connector 5 and process the detected audio signal to reproduce it.
  • the detachable communication system body 4 further includes a transmitter 15 for transmitting the audio signal from the switching center, processed by the communication processor 13, at a first frequency.
  • the earphone/microphone unit 21 is located remotely from the transmitter 15 and wirelessly connected thereto.
  • the earphone/microphone unit 21 is adapted to receive and demodulate the audio signal of the first frequency transmitted from the transmitter 15 and aurally provide the demodulated audio signal to the user.
  • the earphone/microphone unit 21 is further adapted to modulate the user's voice into a predetermined audio signal and transmit the modulated audio signal to the communication processor 13 at a second frequency.
  • a receiver 17 is provided to receive the audio signal of the second frequency transmitted from the earphone/microphone unit 21 and transfer the received audio signal to the communication processor 13.
  • a branch circuit 11 is located between the switching center connector 5 and the communication processor 13 to transfer signals transmitted and received through the switching center connector 5 to the wired or wireless telephone system 1.
  • a dial input unit 18 is connected to the commumcation processor 13 to transfer a desired subscriber telephone number dialed by the user to the communication processor 13.
  • the audio jack 14 is also connected to the communication processor 13 to transfer an audio signal from an external audio system (not shown) to the communication processor 13.
  • the earphone/microphone unit 21 includes a remote receiver 23 for receiving the audio signal of the first frequency transmitted from the transmitter 15, a remote transmitter 25 for transmitting the audio signal of the second frequency to the communication processor 13, and a signal processor 27 for demodulating the audio signal of the first frequency received by the remote receiver 23, processing the demodulated audio signal, modulating the audio signal from the user at the second frequency and outputting the modulated audio signal to the remote transmitter 25.
  • the earphone/microphone unit 21 further includes an earphone 29 for aurally providing the audio signal processed by the signal processor 27 to the user, a microphone 31 for converting the user's voice into the electrical audio signal and outputting the converted audio signal to the signal processor 27, and a charging circuit 33 charged with the DC voltage from the power supply 19 for supplying the charged voltage to the remote transmitter 25, remote receiver 23, signal processor 27, earphone 29 and microphone 31 if necessary. Also connected to the signal processor 27 is a call/standby input unit 35 which has keys for inputting call and standby commands selected by the user, respectively.
  • the commumcation processor 13 detects the received incoming call signal and mixes it with the audio signal from the audio jack 14 to aurally provide them together to the user.
  • the mixed signal from the communication processor 13 is supplied to the earphone 29 within the user's ear sequentially through the transmitter 15, remote receiver 23 and signal processor 27.
  • the user can listen to desired music at normal times and meanwhile conduct a telephone conversation with a calling party in response to a suddenly incoming call signal from a communication system of the calling party.
  • the present invention provides a detachable wireless earphone/microphone device which is capable of being detachably installed in any of general wired and wireless telephones so that the user can converse with a desired telephone subscriber over the telephone while having his both hands free. Therefore, the detachable wireless earphone/microphone device allows the user to move freely while conducting a telephone conversation, resulting in a greater increase in convenience of use. Further, the user can listen to desired music at normal times and meanwhile conduct a telephone conversation with a calling party in response to a suddenly incoming call signal from a communication system of the calling party. This has the effect of maximizing the convenience of use.

Abstract

A detachable wireless earphone/microphone device which is detachably installable in any of general wired and wireless telephones. The device comprises a switching center connector (5) for transmitting and receiving signals to/from a switching center of a telephone office, a communication processor (13) for processing an audio signal from the user and an audio signal from the switching center, a transmitter (15) for transmitting the audio signal from the switching center, processed by the communication processor, at a first frequency, an earphone/microphone unit (21) located remotely from the transmitter, a receiver (17) for receiving an audio signal of a second frequency transmitted from the earphone/microphone unit and transferring the received audio signal to the communication processor, and a branch circuit (11) for transferring the signals transmitted and received through the switching center connector to a wired or wireless telephone system (1).

Description

DETACHABLE WIRELESS EARPHONE/MICROPHONE DEVICE
Technical Field
The present invention relates in general to detachable wireless earphone/microphone devices, and more particularly to a detachable wireless earphone/microphone device which is detachably installable in any of general wired and wireless telephones.
Background Art
As well known to those skilled in the art, a calling party establishes a call connection from either a wired or wireless telephone to another telephone (wired or wireless) of a desired subscriber number via a switching center of a telephone office to conduct a telephone conversation with a called party.
However, a general wired telephone has a disadvantage in that a handset is connected to the telephone body by wire, thereby localizing the user's movements to within a limited range. A general wireless telephone has a disadvantage in that a handset is so large in volume that the user must hold it in either of his both hands to conduct a telephone conversation with a call-connected party. As a result, the user cannot help suspending the current work in progress to converse with the call-connected party over the telephone.
Disclosure of the Invention
Therefore, the present invention has been made in view of the above problems, and it is an object of the present invention to provide a detachable wireless earphone/microphone device which is capable of being detachably installed in any of general wired and wireless telephones so that the user can converse with a desired telephone subscriber over the telephone while having his both hands free. In accordance with the present invention, the above and other objects can be accomplished by a provision of a detachable wireless earphone/microphone device equipped with a general wired or wireless telephone system which includes a connector provided at its predetermined portion for receiving an incoming call signal from a switching center of a telephone office and allows the user to make a call to a telephone of a desired party by personally dialing a subscriber telephone number of the desired party, the device comprising a switching center connector for transmitting and receiving signals to/from the switching center; a communication processor for processing an audio signal from the user, outputting the processed result to the switching center connector, detecting an audio signal from the switching center from the switching center connector and processing the detected audio signal to reproduce it; a transmitter for transmitting the audio signal from the switching center, processed by the communication processor, at a first frequency; an earphone/microphone unit located remotely from the transmitter and wirelessly connected thereto, the earphone/microphone unit receiving and demodulating the audio signal of the first frequency transmitted from the transmitter, aurally providing the demodulated audio signal to the user, modulating the user's voice into a predetermined audio signal and transmitting the modulated audio signal to the communication processor at a second frequency; a receiver for receiving the audio signal of the second frequency transmitted from the earphone/microphone unit and transferring the received audio signal to the communication processor; and a branch circuit connected between the switching center connector and the communication processor for transferring the signals transmitted and received through the switching center connector to the wired or wireless telephone system.
Preferably, the communication processor may be adapted to receive an audio signal from an external audio system, mix the received audio signal with the audio signal from the switching center and output the mixed result to the transmitter.
Brief Description of the Drawings
The above and other objects, features and other advantages of the present invention will be more clearly understood from the following detailed description 1/06668
3 taken in conjunction with the accompanying drawings, in which:
Fig. 1 is a perspective view illustrating a connection between a detachable wireless earphone/microphone device of the present invention and a general telephone; and Fig. 2 is a block diagram showing the construction of the detachable wireless earphone/microphone device of the present invention.
Best Mode for Carrying Out the Invention
Fig. 1 is a perspective view illustrating a connection between a detachable wireless earphone/microphone device of the present invention and a general telephone and Fig. 2 is a block diagram showing the construction of the detachable wireless earphone/microphone device of the present invention.
In Fig. 1, the reference numeral 1 denotes a general wired or wireless telephone system which has a connector 2 provided at its predetermined portion for receiving an incoming call signal from a switching center of a telephone office. The user can make a call to a telephone of a desired party over the wired or wireless telephone system 1 by personally dialing a subscriber telephone number of the desired party.
The detachable wireless earphone/microphone device of the present invention comprises a detachable communication system body 4 connected to the connector 2. The detachable communication system body 4 is adapted to process the incoming call signal from the switching center of the telephone office, transmit the processed result through an antenna and receive an audio signal from the user. An audio connector 6 is provided at a predetermined side portion of the detachable communication system body 4 to receive an audio signal from an external audio system. A detachable earphone/microphone unit 21 is detachably installed in a predetermined top portion of the detachable communication system body 4 to receive a signal transmitted from the body 4, aurally provide the received signal to the user, convert the user's voice into an electrical audio signal and transmit the converted audio signal to the body 4. A power supply 19 is connected to the 1/06668
4 detachable communication system body 4 to convert a commercial voltage of AC 220V or 110V into a predetermined DC voltage and supply the converted DC voltage to the body 4. An audio jack 14 is inserted into the audio connector 6 to transfer the audio signal from the external audio system to the detachable communication system body 4. A switching center connector 5 is further provided in the detachable communication system body 4 to transmit an outgoing call signal to the switching center and receive the incoming call signal therefrom.
With reference to Fig. 2, the detachable communication system body 4 includes the switching center connector 5 and a communication processor 13. As stated previously, the switching center connector 5 is adapted to transmit the outgoing call signal to the switching center and receive the incoming call signal therefrom. The communication processor 13 functions to process the audio signal from the user and output the processed result to the switching center connector 5. The communication processor 13 further functions to detect an audio signal from the switching center from the switching center connector 5 and process the detected audio signal to reproduce it. The detachable communication system body 4 further includes a transmitter 15 for transmitting the audio signal from the switching center, processed by the communication processor 13, at a first frequency. The earphone/microphone unit 21 is located remotely from the transmitter 15 and wirelessly connected thereto. The earphone/microphone unit 21 is adapted to receive and demodulate the audio signal of the first frequency transmitted from the transmitter 15 and aurally provide the demodulated audio signal to the user. The earphone/microphone unit 21 is further adapted to modulate the user's voice into a predetermined audio signal and transmit the modulated audio signal to the communication processor 13 at a second frequency. A receiver 17 is provided to receive the audio signal of the second frequency transmitted from the earphone/microphone unit 21 and transfer the received audio signal to the communication processor 13. A branch circuit 11 is located between the switching center connector 5 and the communication processor 13 to transfer signals transmitted and received through the switching center connector 5 to the wired or wireless telephone system 1. A dial input unit 18 is connected to the commumcation processor 13 to transfer a desired subscriber telephone number dialed by the user to the communication processor 13. The audio jack 14 is also connected to the communication processor 13 to transfer an audio signal from an external audio system (not shown) to the communication processor 13. The earphone/microphone unit 21 includes a remote receiver 23 for receiving the audio signal of the first frequency transmitted from the transmitter 15, a remote transmitter 25 for transmitting the audio signal of the second frequency to the communication processor 13, and a signal processor 27 for demodulating the audio signal of the first frequency received by the remote receiver 23, processing the demodulated audio signal, modulating the audio signal from the user at the second frequency and outputting the modulated audio signal to the remote transmitter 25. The earphone/microphone unit 21 further includes an earphone 29 for aurally providing the audio signal processed by the signal processor 27 to the user, a microphone 31 for converting the user's voice into the electrical audio signal and outputting the converted audio signal to the signal processor 27, and a charging circuit 33 charged with the DC voltage from the power supply 19 for supplying the charged voltage to the remote transmitter 25, remote receiver 23, signal processor 27, earphone 29 and microphone 31 if necessary. Also connected to the signal processor 27 is a call/standby input unit 35 which has keys for inputting call and standby commands selected by the user, respectively.
On the other hand, in the case where an incoming call signal from a communication system of a calling party is received via the switching center under the condition that the audio signal from the audio jack 14 is supplied to the earphone 29 within the user's ear sequentially through the communication processor 13, transmitter 15, remote receiver 23 and signal processor 27, then the commumcation processor 13 detects the received incoming call signal and mixes it with the audio signal from the audio jack 14 to aurally provide them together to the user. As a result, the mixed signal from the communication processor 13 is supplied to the earphone 29 within the user's ear sequentially through the transmitter 15, remote receiver 23 and signal processor 27.
Therefore, with the present detachable wireless earphone/microphone device constructed as described above, the user can listen to desired music at normal times and meanwhile conduct a telephone conversation with a calling party in response to a suddenly incoming call signal from a communication system of the calling party.
Industrial Applicability
As apparent from the above description, the present invention provides a detachable wireless earphone/microphone device which is capable of being detachably installed in any of general wired and wireless telephones so that the user can converse with a desired telephone subscriber over the telephone while having his both hands free. Therefore, the detachable wireless earphone/microphone device allows the user to move freely while conducting a telephone conversation, resulting in a greater increase in convenience of use. Further, the user can listen to desired music at normal times and meanwhile conduct a telephone conversation with a calling party in response to a suddenly incoming call signal from a communication system of the calling party. This has the effect of maximizing the convenience of use.
Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.

Claims

Claims:
1. A detachable wireless earphone/microphone device equipped with a general wired or wireless telephone system which includes a connector provided at its predetermined portion for receiving an incoming call signal from a switching center of a telephone office and allows the user to make a call to a telephone of a desired party by personally dialing a subscriber telephone number of the desired party, said device comprising: a switching center connector for transmitting and receiving signals to/from said switching center; a communication processor for processing an audio signal from the user, outputting the processed result to said switching center connector, detecting an audio signal from said switching center from said switching center connector and processing the detected audio signal to reproduce it; a transmitter for transmitting the audio signal from said switching center, processed by said communication processor, at a first frequency; an earphone/microphone unit located remotely from said transmitter and wirelessly connected thereto, said earphone/microphone unit receiving and demodulating the audio signal of the first frequency transmitted from said transmitter, aurally providing the demodulated audio signal to the user, modulating the user's voice into a predetermined audio signal and transmitting the modulated audio signal to said communication processor at a second frequency; a receiver for receiving the audio signal of the second frequency transmitted from said earphone/microphone unit and transferring the received audio signal to said communication processor; and a branch circuit connected between said switching center connector and said commumcation processor for transferring the signals transmitted and received through said switching center connector to the wired or wireless telephone system.
2. A detachable wireless earphone/microphone device as set forth in Claim 1, wherein said communication processor is adapted to receive an audio signal from an external audio system, mix the received audio signal with said audio signal from said switching center and output the mixed result to said transmitter.
PCT/KR2000/000783 1999-07-20 2000-07-19 Detachable wireless earphone/microphone device WO2001006668A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU60249/00A AU6024900A (en) 1999-07-20 2000-07-19 Detachable wireless earphone/microphone device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1999/29374 1999-07-20
KR1019990029374A KR100371449B1 (en) 1999-07-20 1999-07-20 Wireless exchanging phone having the earphone and the mic of wireless

Publications (1)

Publication Number Publication Date
WO2001006668A1 true WO2001006668A1 (en) 2001-01-25

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Application Number Title Priority Date Filing Date
PCT/KR2000/000783 WO2001006668A1 (en) 1999-07-20 2000-07-19 Detachable wireless earphone/microphone device

Country Status (3)

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KR (1) KR100371449B1 (en)
AU (1) AU6024900A (en)
WO (1) WO2001006668A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100411466C (en) * 2004-08-20 2008-08-13 乐金电子(中国)研究开发中心有限公司 Audio output apparatus of mobile communication terminal
WO2014184778A1 (en) 2013-05-17 2014-11-20 Novartis Ag Pyrimidin-4-yl)oxy)-1h-indole-1-carboxamide derivatives and use thereof

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4669109A (en) * 1985-02-26 1987-05-26 Cheviller Jean Pierre Le Telephone apparatus with a fixed telephone station coupled to a mobile and detachable handset
US4930156A (en) * 1988-11-18 1990-05-29 Norcom Electronics Corporation Telephone receiver transmitter device
JPH09252335A (en) * 1996-03-14 1997-09-22 Anritsu Corp Telephone set
KR19980072187A (en) * 1998-07-29 1998-10-26 조남유 Wireless ear microphone on the phone

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4669109A (en) * 1985-02-26 1987-05-26 Cheviller Jean Pierre Le Telephone apparatus with a fixed telephone station coupled to a mobile and detachable handset
US4930156A (en) * 1988-11-18 1990-05-29 Norcom Electronics Corporation Telephone receiver transmitter device
JPH09252335A (en) * 1996-03-14 1997-09-22 Anritsu Corp Telephone set
KR19980072187A (en) * 1998-07-29 1998-10-26 조남유 Wireless ear microphone on the phone

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100411466C (en) * 2004-08-20 2008-08-13 乐金电子(中国)研究开发中心有限公司 Audio output apparatus of mobile communication terminal
WO2014184778A1 (en) 2013-05-17 2014-11-20 Novartis Ag Pyrimidin-4-yl)oxy)-1h-indole-1-carboxamide derivatives and use thereof

Also Published As

Publication number Publication date
KR19990073522A (en) 1999-10-05
AU6024900A (en) 2001-02-05
KR100371449B1 (en) 2003-02-07

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