(12) INTERNATIONAL APPLICATION PUBLISHED UNDER THE PATENT COOPERATION TREATY (PCT)
`
`(19) World Intellectual Property Organization
`International Bureau
`
`(43) International Publication Date
`21 September 2006 (21.09.2006)
`
`(51) International Patent Classification:
`H04B 1/40 (2006.01)
`
`ii"
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`'
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`PCT
`
`(10) International Publication Number
`
`WO 2006/098584 A1
`
`(21) International Application Number:
`PCT/KR2006/000922
`
`(22) International Filing Date:
`
`15 March 2006 (15.03.2006)
`
`(25) Filing Language:
`
`(26) Publication Language:
`
`English
`
`English
`
`(30) Priority Data:
`10—2005—0022732
`
`18 March 2005 (18.03.2005)
`
`KR
`
`(71) Applicant (for all designated States except US): OPEN-
`BRAlN TECHNOLOGIES CO., LTD. [KR/KR]; 804,
`Anyang K—Ccntcr, 1591—9 Gwanyang—dong, Dongan—gu,
`Anyang—si, Gyeonggi—do 431—060 (KR).
`
`(72) Inventor; and
`0H, Jae Duk
`(for US only):
`(75) Inventor/Applicant
`41,
`burim—dong,
`Jugong Apt,
`[KR/KR];
`812—402
`Gwacheon—si, Gyeonggi—do 427—804 (KR).
`
`(81) Designated States (unless otherwise indicated, for every
`kind of national protection available): AE, AG, AL, AM,
`AT, AU, AZ, BA, BB, BG, BR, BW, BY, BZ, CA, CH, CN,
`CO, CR, CU, CZ, DE, DK, DM, DZ, EC, EE, EG, ES, FI,
`GB, GD, GE, GH, GM, HR, HU, ID, IL, IN, IS, JP, KE,
`KG, KM, KN, KP, KZ, LC, LK, LR, LS, LT, LU, LV, LY,
`MA, MD, MG, MK, MN, MW, MX, MZ, NA, NG, NI, NO,
`NZ, OM, PG, PH, PL, PT, RO, RU, SC, SD, SE, SG, SK,
`SL, SM, SY, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ,
`VC, VN, YU, ZA, ZM, ZW.
`
`(84) Designated States (unless otherwise indicated, for every
`kind of regional protection available): ARIPO (BW, GH,
`GM, KE, LS, MW, MZ, NA, SD, SL, SZ, TZ, UG, ZM,
`ZW), Eurasian (AM, AZ, BY, KG, KZ, MD, RU, TJ, TM),
`European (AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI,
`FR, GB, GR, HU, IE, IS, IT, LT, LU, LV, MC, NL, PL, PT,
`RO, SE, SI, SK, TR), OAPI (BF, BJ, CF, CG, CI, CM, GA,
`GN, GQ, GW, ML, MR, NE, SN, TD, TG).
`
`Published:
`
`with international search report
`
`(74) Agent: CHANG & HAN PATENT & LAW FIRM;
`1405, Gangnam Building,
`l32l—l Seocho—dong,
`Seo—
`cho—gu, Seoul 137—857 (KR).
`
`For two-letter codes and other abbreviations, refer to the "Guid-
`ance Notes on Codes and Abbreviations ” appearing at the begin-
`ning of each regular issue of the PCT Gazette.
`
`(54) Title: WIRELESS EAR—PHONE AND PORTABLE TERMINAL USING THE SAME
`
`
`j
` ECHO/NOISE
`
`ELIMINATING CIRCUIT
`
`
`
`
`
`
`
`
`
`
`h
`HF THANSM ITTl NG/HECEIVJ NG
`
`BASEBAND PROCESSINGE
`CIRCUIT
`E
`
`CIRCUIT
`,
`
`CHARGE CONNECTING
`P0 1 NT
`
`;
`
`
`
`6/098584A1|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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`B
`
`(57) Abstract: A wireless earphone includes: a wireless transmitting/receiving unit for transmitting/ receiving a signal to/from the
`portable terminal according to a short wireless communication scheme; a voice detecting unit for detecting a user’voice signal with
`c being inserted into an ear of the user; a signal processing unit for converting a short range wireless communication signal received
`a through the wireless transmitting/receiving unit to an audio signal, eliminating noise and echo from a voice signal received through
`N the voice detecting unit, converting the noise and echo eliminated voice signal to a short range wireless communication signal and
`transmitting the short range wireless communication signal; an output unit for outputting the audio signal received from the signal
`processing unit; and a power supplying unit for receiving power and being charged when the wireless stereo earphone is attached to
`the mobile terminal, and supplying the power to each element of the wireless earphone.
`
`Bose Exhibit 1099
`Bose Exhibit 1099
`Bose V. Koss
`Bose v. Koss
`
`

`

`WO 2006/098584
`
`PCT/KR2006/000922
`
`WIRELESS EAR-PHONE AND PORTABLE TERMINAL USING
`
`Description
`
`Technical Field
`
`THE SAME
`
`[1]
`
`The present invention relates to a wireless ear-phone and a portable terminal using
`
`the same; and more particular, to a wireless stereo ear-phone and a portable terminal
`
`interacted with a wireless stereo ear—phone.
`
`Background Art
`
`[2]
`
`A portable terminal denotes a terminal handy to carry such as a mobile com-
`
`munication terminal, a personal communication service (PCS) terminal, a personal
`
`digital assistant (PDA), a smart phone, a next generation mobile communication
`
`terminal, a wireless local area network (LAN) terminal, a digital multimedia
`
`broadcasting (DMB) terminal, a portable Internet terminal, a portable music re-
`
`producing device and a portable multimedia reproducing device.
`
`[3]
`
`A mobile communication terminal has been dramatically developed and such a de—
`
`velopment allows the mobile communication terminal to have various entertainment
`
`functions such as a game, a camera, a video player and a MP3 player as well as the
`
`communication function. Such a mobile communication terminal having various
`
`functions has been popular among users. Despite of dramatic development of the
`
`mobile communication terminal, there are still many researches in actively progress to
`
`develop mobile communication terminals to have functions of receiving a digital
`
`broadcasting, storing and reproducing multimedia files and video referencing function.
`
`[4]
`
`According to introduction of various functions for a mobile communication
`
`terminal, there were many peripheral devices developed and introduced in various
`
`shapes. For example, various peripheral devices connected to the mobile com—
`
`munication terminal through a universal serial bus (USB) port. Recently, a short range
`
`wireless communication technology such as Bluetooth technology is commonly used
`
`to connect a peripheral device to the mobile communication terminal.
`
`[5]
`
`Moreover, it is a current trend to integrate peripheral devices with the mobile com-
`
`munication terminal. For example, an external camera, an external MP3 player and a
`
`FM radio are integrally embedded into the mobile communication terminal for
`
`convenience to carry.
`
`[6]
`
`On the contrary, there is a peripheral device providing convenience when it is
`
`separated from the mobile communication terminal, for example, an input/output
`
`device. That is, an earphone or a headphone is generally used for reproducing
`
`multimedia files such as movie image files or reproducing music files. However, the
`
`

`

`WO 2006/098584
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`PCT/KR2006/000922
`
`[7]
`
`[8]
`
`[9]
`
`user may have restrictions because the conventional earphone and headphone are
`
`connected to the mobile communication terminal through a cable.
`
`In order to overcome such an inconvenience, a wireless earphone or a wireless
`
`headset were introduced in US Patent Publication No. 2004/0141610 A1 (Jul. 22,
`
`2004), US Patent Publication No. 2005/0204155 A1 (Oct. 14, 2004), US Patent No.
`
`6021207A (Feb. 1, 2000) and US Patent No. 6230019 B1 (May. 8, 2001).
`
`Also, a wireless earphone inserted into a human’ ear was introduced in Japan Patent
`
`Application No. 2004—220147.
`
`According to these conventional technologies, a short range wireless com—
`
`munication device such as a Bluetooth transmitting/receiving device embedded in a
`
`mobile communication terminal to transmit an audio signal to the wireless earphone
`
`through a wireless link.
`
`[10]
`
`However, a non-rechargeable battery or a rechargeable battery is used to supply a
`
`power and the rechargeable battery is generally embedded in the wireless earphone. In
`
`case of using the rechargeable battery, the wireless earphone or the wireless headset
`
`uses different power charging units which are separately provided from the mobile
`
`wireless communication terminal. A battery running time of the wireless earphone may
`
`be different from that of the mobile communication terminal. Therefore, the wireless
`
`headset may not be available to use since the battery thereof are all used.
`
`[11]
`
`Since the wireless headset is an independent device from the wireless com-
`
`munication terminal, a user carries the wireless headset, separately. So, there is a great
`
`chance to loss the wireless headset. Since the conventional wireless headset is
`
`generally designed to be wearable at one ear only, the conventional wireless headset
`
`cannot process a stereo audio signal. In a view of the current trend of demanding the
`
`multimedia functions of the wireless communication terminal, the users cannot
`
`satisfied with the conventional mono type earphone. Therefore, there are greater
`
`demands for a high quality stereo audio device.
`
`[12]
`
`The conventional headset is generally designed to have a right side speaker and a
`
`left side speaker or a right side earphone and a left side earphone, which are connected
`
`by a band. And, a circuit for providing a wireless headset function is embedded at one
`
`side of the conventional headset and a rechargeable batter is disposed at other side of
`
`the conventional headset. Such a design of the conventional headset makes the con-
`
`ventional headset difficult to be miniaturized and makes a user inconvenient to carry.
`
`Meanwhile, a conventional wireless earphone that is rechargeable through
`
`connecting to a wireless communication terminal was introduced in Korea Patent
`
`Publication No. 1999-0046637 and Korea Patent Publication No. 2003-0064155.
`
`Although these conventional technologies were introduced to overcome the
`
`shortcoming of the wired earphone, it is still difficult to miniaturize the wireless
`
`[13]
`
`[14]
`
`

`

`WO 2006/098584
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`PCT/KR2006/000922
`
`earphone or the wireless headset because a microphone must be disposed near to a
`
`mouth to guarantee a high speech quality. However, such a design makes the wireless
`
`headset to be miniaturized. On the contrary, if the microphone is disposed near to a
`
`speaker in order to miniaturize the wireless headset, the speed quality is degraded.
`
`Disclosure of Invention
`
`Technical Problem
`
`[15]
`
`It is, therefore, an object of the present invention to provide a wireless earphone
`
`attachable to a main body of a communication wireless terminal for transmitting]
`
`receiving a wireless communication signal to/from a mobile communication terminal
`
`by interacting with a mobile communication terminal while providing convenience a
`
`user to carry when the wireless earphone is not used.
`
`[16]
`
`It is another object of the present invention to provide a wireless communication
`
`terminal for transmitting and receiving a short range wireless communication signal to]
`
`from the wireless earphone by interacting with the wireless earphone and for housing
`
`and recharging the wireless earphone.
`
`Technical Solution
`
`[17]
`
`In accordance with one aspect of the present invention, there is a wireless stereo
`
`earphone attachable to a portable terminal including: a wireless transmitting] receiving
`
`unit for transmitting/receiving a signal to/from the portable terminal according to a
`
`short wireless communication scheme; a voice detecting unit for detecting a user’voice
`
`signal with being inserted into an ear of the user; a signal processing unit for
`
`converting a short range wireless communication signal received through the wireless
`
`transmitting/receiving unit to an audio signal, eliminating noise and echo from a voice
`
`signal received through the voice detecting unit, converting the noise and echo
`
`eliminated voice signal to a short range wireless communication signal and
`
`transmitting the short range wireless communication signal; an output unit for
`
`outputting the audio signal received from the signal processing unit; and a power
`
`supplying unit for receiving power and being charged when the wireless stereo
`
`earphone is attached to the mobile terminal, and supplying the power to each element
`
`of the wireless earphone.
`
`[18]
`
`In accordance with another aspect of the present invention, there is provided a
`
`portable terminal with an attachable wireless stereo earphone, including: an attaching]
`
`detaching unit for attaching the wireless stereo earphone to the mobile terminal or
`
`detaching the wireless stereo earphone from the portable terminal, and charging the
`
`wireless earphone by connecting a rechargeable battery of the wireless earphone to a
`
`charging circuit of the portable terminal when the wireless stereo earphone is attached
`
`to the portable terminal; a controlling unit for connecting/disconnecting a wireless
`
`

`

`WO 2006/098584
`
`PCT/KR2006/000922
`
`communication path between the wireless earphone and the portable terminal by
`
`sensing the wireless earphone to be attached or to be detached to/from the attaching]
`
`detaching unit, transmitting an audio signal to a short range wireless transmitting]
`
`receiving unit by sensing the wireless earphone to be separated from the attaching]
`
`detaching unit and converting a voice signal transmitted from the short range wireless
`
`transmitting] receiving unit to a wireless communication signal and radiating the
`
`wireless communication signal; and the short range wireless communication unit for
`
`connecting or disconnecting a wireless communication path between the wireless
`
`earphone and the portable terminal in response to the controlling unit, converting the
`
`audio signal received from the controlling unit to a short range wireless com-
`
`munication signal, outputting the short range wireless communication signal, and
`
`converting a short range wireless communication signal received from the wireless
`
`earphone to an audio signal.
`
`Advantageous Effects
`
`[19]
`
`A wireless earphone according to the present invention has a capability of
`
`transmitting/receiving a voice and an audio signal to/from a mobile communication
`
`terminal and has a shape of an earplug. Therefore, a user can conveniently
`
`communicate with a person on the other end of the communication link, reproduce a
`
`multimedia file, receive a broadcast program of TV and have a video conference using
`
`the wireless earphone by putting the wireless earphone into the ears. Also, the wireless
`
`earphone is easy to carry by attaching the wireless earphone to the main body of the
`
`mobile communication terminal when it is not used. That is, the wireless earphone may
`
`be protected from being lost.
`
`Brief Description of the Drawings
`
`[20]
`
`The above and other objects and features of the present invention will become
`
`apparent from the following description of the preferred embodiments given in
`
`[21]
`
`[22]
`
`[23]
`
`[24]
`
`[25]
`
`conjunction with the accompanying drawings, in which:
`
`FIG. 1 is a perspective view of a wireless earphone according to an embodiment of
`
`the present invention;
`
`FIG. 2 is a front view illustrating a wireless earphone 100 attached or detached to]
`
`from a mobile communication terminal 200;
`
`FIG. 3 is a side view of a mobile wireless terminal 200 with a wireless earphone
`
`100 attached according to an embodiment of the present invention;
`
`FIG. 4 is a cross-sectional view of a wireless earphone according to an embodiment
`
`of the present invention;
`
`FIG. 5 is a block diagram illustrating a wireless earphone 100 according to an
`
`embodiment of the present invention;
`
`

`

`WO 2006/098584
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`PCT/KR2006/000922
`
`[26]
`
`[27]
`
`FIG. 6 is a View showing a method of using a wireless earphone according to the
`
`present invention; and
`
`FIG. 7 is a block diagram illustrating a mobile communication terminal having a
`
`wireless earphone according to the present invention.
`
`Best Mode for Carrying Out the Invention
`
`[28]
`
`Other objects and aspects of the invention will become apparent from the following
`
`description of the embodiments with reference to the accompanying drawings, which is
`
`set forth hereinafter.
`
`[29]
`
`[30]
`
`FIG. 1 is a perspective view of a wireless earphone according to an embodiment of
`
`the present invention.
`
`As shown in FIG. 1, the wireless earphone 100 according to the present
`
`embodiment is shaped in an earplug, and includes an inserting unit 10 putted into an
`
`earhole of a user and a main body 20 connected to the inserting unit 10. The main body
`
`20 includes an antenna, a battery, a speaker and a signal processing circuit for
`
`performing a wireless headset function.
`
`[31]
`
`The inserting unit 10 transmits and receives an audio signal to/from a wireless com-
`
`munication terminal though a wireless communication link when a user puts the
`
`inserting unit 10 into the his earhole and the wireless earphone 10 is in the active
`
`mode. Herein the audio signal denotes a stereo audio signal as well as a voice signal.
`
`On contrary, if the wireless earphone 100 is not used, the wireless earphone 100 is
`
`attached to the main body of the mobile communication terminal as shown in FIGs. 2
`
`and 3. FIG. 2 is a front view illustrating a wireless earphone 100 attached or detached
`
`to/from a mobile communication terminal 200, and FIG. 3 is a side view of a mobile
`
`wireless terminal 200 with a wireless earphone 100 attached according to an
`
`embodiment of the present invention.
`
`[32]
`
`The inserting unit 10 has a shape of curves to be comfortably inserted into an
`
`earhole of a user and is made of material having elasticity and smooth texture to
`
`provide comfortable wearing sensations. The inserting unit 10 includes a voice signal
`
`detecting unit such as a microphone or a voice detecting device from a user’ bone. Ac-
`
`cordingly, the inserting unit 10 has a shape and is made of a material to be closely
`
`adhered to the user’ earhole in order to effectively detect the user’voice.
`
`[33]
`
`In order to attach the inserting unit 10 to the mobile communication terminal 200, a
`
`groove 401 formed on the wireless earphone 100 is connected to a mounting unit 201
`
`formed on the mobile communication terminal 200. When the insertng unit 10 is
`
`attached to the mobile communication terminal 200 as shown in FIG. 4, a recharge
`
`contacting point 402 must be connected to a power supplying line (not shown) of the
`
`mobile communication terminal 200. Although the groove 41 and the recharge
`
`

`

`WO 2006/098584
`
`PCT/KR2006/000922
`
`contacting point 402 are formed on the main body 20 of the wireless earphone
`
`according to the present embodiment shown in FIG. 4, the groove 41 and the recharge
`
`contacting point 402 may be formed various locations in other embodiments.
`
`[34]
`
`Hereinafter, the wireless earphone 100 according to the present invention will be
`
`described when the wireless earphone 100 is used for the wireless communication
`
`terminal 200 as an example. However, it is obvious that the wireless earphone 100
`
`according to the present invention can be used to various devices having a short range
`
`wireless communication module such as a portable audio device, a communication
`
`device and a notebook computer. The short range wireless communication denotes a
`
`communication between various electronic devices to exchange data in a short range
`
`using an electric wave as a transmission medium of information. Most popular
`
`technologies for the short range wireless communication are a wireless local area
`
`network (LAN), a Bluetooth, a ZigBee, a HomeRF, an Ultra Wide Band (UWB). Such
`
`technologies replace a wired communication to a wireless communication in various
`
`fields to make a user convenient. Especially, the Bluetooth is commonly adopted into a
`
`mobile communication terminal to exchange information to peripheral devices.
`
`[35]
`
`Meanwhile, the inserting unit 10 includes a voice signal detector 41 such as a
`
`microphone or a sensor for detecting voice transmitted along a bone of a user. The con-
`
`ventional wireless headset or the conventional ear—set that is an earphone with a
`
`microphone generally use a microphone to receive the user’voice. In this case, the
`
`microphone is disposed near to the mouth to guarantee a high speed quality. Such a
`
`design makes it hard to miniaturize.
`
`[36]
`
`The wireless earphone 100 according to the present embodiment includes the voice
`
`signal detector 41 not far away from the speaker and is integrally embedded using a
`
`microphone or a sensor for detecting voice transmitted along a bone of a user. As a
`
`result, a volume thereof is reduced.
`
`[37]
`
`The main body 20 includes an antenna 42 for transmitting/receiving a short range
`
`wireless communication signal; a signal processing circuit 43 for converting a received
`
`short range wireless communication signal to an audio signal and outputting through a
`
`speaker 44, and converting the received audio signal from a voice signal detector 41 to
`
`a short range wireless communication signal and transmitting the short range wireless
`
`communication signal through the antenna 42; a speaker 44 for receiving an audio
`
`signal from the signal processing circuit 43 and outputting the received audio signal;
`
`and a battery 45 for supplying electric power to elements included in the inserting unit
`
`10 and the main body 20.
`
`[38]
`
`The battery 45 may be recharged through a port (not shown) connectable to an
`
`external charger, or through a connector (not shown) of a mobile communication
`
`terminal 200 from a battery mounted at the mobile communication terminal 200. The
`
`

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`WO 2006/098584
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`[39]
`
`[40]
`
`mobile communication telminal 200 turns on/off the signal process circuit 43 by
`
`sensing the wireless earphone 100 to be attached or detached through the connector.
`
`Hereinafter, the wireless earphone 100 according to the present invention will be
`described in detail.
`
`FIG. 5 is a block diagram illustrating a wireless earphone 100 according to an
`
`embodiment of the present invention. FIG. 5 shows one of a right side unit and a left
`
`side unit of the wireless earphone 100 according to the present invention. A user puts
`
`the both side units of the wireless earphone on his ears to listen a stereo audio signal
`
`transmitted from the mobile communication terminal 200 or transmits his speech to a
`
`person on the other end of the communication line connected through the mobile com-
`
`munication network.
`
`[41]
`
`The right side unit and the left side unit of the wireless earphone 100 have a same
`
`hardware configuration and are distinguished by the mobile communication terminal
`
`100 in software manner. That is, the wireless earphone 100 according to the present
`
`invention is different from the conventional stereo earphone having speakers with a
`
`fixed side. That is, the right side and the left side of the wireless earphone 100
`
`according to the present invention are controlled in software manner. If a user losses or
`
`breaks one of side units of the wireless earphone 100, the user may purchase only lost
`
`or broken one for replacement. Therefore, the wireless earphone 100 according to the
`
`present invention has more economic benefit compared to the conventional earphone.
`
`[42]
`
`Although the wireless earphone 100 according to the present invention is designed
`
`to output a stereo audio signal, the wireless earphone 100 according to the present
`
`invention may output a mono audio signal using one of the right side unit and the left
`
`side unit, only. It is possible because the left side unit and the right side unit of the
`
`wireless earphone 100 independently have a speaker and an voice detecting unit.
`
`[43]
`
`Meanwhile, an echo may be created at an audio signal transmitted to a person on
`
`the other end of the communication line because the voice detecting unit is located
`
`near to the speaker when the user use the wireless earphone 100 to call.
`
`[44]
`
`In order to overcome such a shortcoming, an echo eliminating circuit using a digital
`
`signal processor (DSP) may be included. Generally, the echo eliminating circuit
`
`memorizes a received audio signal, determines whether the received audios signal is
`
`mixed with a transmitting audio signal, and eliminates the mixed signal. Various echo
`
`eliminating technologies were introduced and are well-known to those skilled in the
`
`art. Therefore, details thereof are omitted.
`
`[45]
`
`As one of methods of eliminating the echo, the wireless earphone according to the
`
`present invention determines whether both of the left side unit and the right side unit of
`
`the wireless earphone 100 are connected to the mobile communication terminal 200
`
`when the mobile communication terminal 200 is in a voice communication mode. If
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`

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`WO 2006/098584
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`PCT/KR2006/000922
`
`[46]
`
`[47]
`
`[48]
`
`[49]
`
`[50]
`
`both of the side units are connected, a speaker included in one of the side units is
`
`activated and a voice signal detecting unit therein is inactivated. On the contrary, a
`
`speaker and an voice detecting unit in other side unit of the earphone are inactivated.
`
`As shown in FIG. 5, the wireless earphone 100 includes an antenna 42, a signal
`
`processing circuit 43, a speaker 44, a voice detecting unit 41 and a battery 45.
`
`The antenna 42 receives a signal transmitted from a mobile communication terminal
`
`200 based on short range wireless communication scheme, and transmits a short range
`
`wireless communication signal generated from the signal processing circuit 43.
`
`The speaker 44 outputs an audio signal received from the signal processing circuit
`
`43. The audio signal outputted through the speaker 41 may be a voice signal of a
`
`person on the other end of the communication link or a stereo audio signal reproduced
`
`from the mobile communication terminal 200.
`
`The voice detecting unit 41 detects a voice signal of a user from a vibration of air in
`the earhole or from a skin or a bone.
`
`The battery 45 includes a charging circuit 509 and a rechargeable battery 510. The
`
`charging circuit 509 receives power from a connector 402 connected to the mobile
`
`communication terminal 200, charges the rechargeable battery 510 and supplies the
`
`power in the rechargeable battery 510 to elements of the wireless earphone, uniformly.
`
`[51]
`
`The signal processing circuit 43 converts a short range wireless communication
`
`signal received through an antenna 42 to an audio signal and outputs the audio signal
`
`through the speaker 44. The signal processing circuit 43 also eliminates noise or echo
`
`from an audio signal received from the voice detecting unit 41, converts the audio
`
`signal to a short range wireless communication signal and transmits the short range
`
`wireless communication signal through the antenna 42.
`
`[52]
`
`The signal processing circuit 43 includes a radio frequency (RF) transmitting]
`
`receiving circuit 501; a baseband processing circuit 502, an echo/noise eliminating
`
`circuit 503, an audio reproducing circuit 504, an analogue-digital converter 505, a
`
`digital-analogue converter 506, an input amplifier 507 and an output amplifier 508.
`
`[53]
`
`The RF transmitting/receiving circuit 501 amplifies, filters and convents a short
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`range wireless communication signal received through an antenna to a wired signal and
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`transmits the wired signal to a baseband processing circuit 52. Also, the RF
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`transmitting/receiving circuit 501 converts the wired signal transmitted from the
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`baseband processing circuit 502 to a short range communication signal and transmits
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`the short range communication signal through the antenna 42.
`
`[54]
`
`The baseband processing circuit 502 demodulates the signal received from the RF
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`transmitting/receiving circuit 501 and transmits the demodulated signal to the audio re-
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`producing circuit 504. The baseband processing circuit 502 also receives the voice
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`signal transmitted from the echo/noise eliminating circuit 503 and transmits the voice
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`

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`WO 2006/098584
`
`PCT/KR2006/000922
`
`signal to the RF transmitting and receiving circuit 501. Herein, the signal transmitted
`
`to the audio reproducing circuit 504 is a compressed stereo audio signal or voice
`
`signal.
`
`[55]
`
`[56]
`
`[57]
`
`[58]
`
`[59]
`
`[60]
`
`[61]
`
`[62]
`
`The audio reproducing circuit 504 decompresses the compressed stereo audio signal
`
`or voice signal transmitted from the baseband processing circuit 502.
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`The digital-analog converter 506 receives the decompressed stereo audio signal or
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`voice signal from the audio reproducing circuit 504 and converts the received signal to
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`an analog signal.
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`The output amplifier 508 amplifies an analog signal transmitted from the digital-
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`analog converter 506 and outputs the amplified analog signal through the speaker 44.
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`The input amplifier 507 amplifies a voice signal transmitted from the voice signal
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`detecting unit 41.
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`The analog-digital converter 505 converts an analog voice signal transmitted throu
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`gh the input amplifier 507 to a digital signal.
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`The echo/noise eliminating circuit 503 eliminates noise and echo from the voice
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`signal received from the analog-digital converter 505.
`
`Hereinafter, a mobile communication terminal having a wireless earphone
`
`according to the present invention will be described.
`
`FIG. 7 is a block diagram illustrating a mobile communication terminal having a
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`wireless earphone according to the present invention.
`
`[63]
`
`As shown in FIG. 7, the mobile communication terminal includes a wireless
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`transmitting/receiving unit 71, a central processing unit (MSM) 72, a CODEC 73, a
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`memory 74, a audio output device (speaker) 75, a display (LCD) 76, an input device
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`(keypad) 77, an voice input unit (microphone) 78, a short range wireless transceiver 71
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`and an earphone mounting unit 880.
`
`[64]
`
`The wireless transmitting/receiving unit 71 transmits/receives a signal to/from a
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`base station through an antenna. The signal transmitted through the wireless
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`transmitting/receiving unit 71 is transmitted to other person s mobile communication
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`terminal connected through the base station and a mobile communication network.
`
`[65]
`
`The central processing unit (MSM) 72 generally controls and drives the mobile
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`communication terminal 200. Especially, the MSM 72 establishes a wireless com—
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`munication link between the short range wireless transceiver 79 and the wireless
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`earphone 100 when the MSM 72 senses the wireless earphone 100 to be detached from
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`the earphone mounting unit 80. Then, the MSM 72 controls related elements to
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`transmit an audio signal to be outputted through the audio output unit (Speaker) 75 to
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`the short range wireless transceiver 79. The audio signal to be outputted may include
`
`an audio signal received through the wireless transmitting/receiving unit 71 such as a
`
`speech voice signal or a stereo audio signal and a stereo audio signal reproduced from
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`

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`WO 2006/098584
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`PCT/KR2006/000922
`
`10
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`the MSM 72. The short range wireless transceiving unit 79 converts the audio signal
`
`transmitted from the MSM 72 to a short range wireless communication signal and
`
`transmits the short range wireless communication signal through the antenna.
`
`[66]
`
`The stereo audio signal or the voice signal is compressed before it is transmitted to
`
`the short range wireless transceiver 79. Herein, both of a left audio signal and a right
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`audio signal may be compressed together or they are independently compressed and
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`transmitted to the short range wireless transceiver 79. When they are independently
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`compressed, a left audio signal is transmitted to a left side unit of the wireless earphone
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`and a right audio signal is transmitted to a right side unit of the wireless earphone.
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`The antenna may be embodied as one antenna to process two bands. However, two
`
`antennas may be included to process two bands, separately.
`
`The MSM 72 converts an audio signal received from the wireless earphone 100
`
`through the short range wireless transceiver 79 to a wireless communication signal and
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`transmits the wireless communication signal through the wireless transceiver 71 and
`the antenna.
`
`[67]
`
`[68]
`
`[69]
`
`The short range wireless transceiver 79 connects or disconnects a wireless com-
`
`munication path to the wireless earphone 100 in response to the control of the MSM
`
`72. Also, the short range wireless transceiver 79 converts an audio signal from the
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`MSM 72 to a short range wireless communication signal and transmits the short range
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`wireless communication signal to the wireless earphone 100. Furthermore, the short
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`rage wireless transceiver 79 converts the short range wireless communication signal
`
`received from the wireless earphone 100 to an audio signal and transmits the audio
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`signal to the MSM 73 in order to transmit the audio signal trough the wireless
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`transmitting/receiving unit 71.
`
`[70]
`
`The short range wireless communication signal received from the wireless earphone
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`100 is a voice of a user. Generally, it is a signal input through a voice input unit 78
`
`such as a microphone. Meanwhile, the wireless communication signal transmitted by
`
`the mobile communication terminal 200 through the antenna is transmitted to a mobile
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`communication terminal of a person on the other end of the communication line
`
`through the base station and the mobile communication network.
`
`[71]
`
`The MSM 72 charges the wireless earphone 100 through a charge connecting point
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`402 which connects the wireless earphone 100 and the earphone mounting unit 80
`
`when the wireless earphone 100 is attached to the mobile communication terminal. In
`
`order to control charging