USOO7444172B1
`
`(12) United States Patent
`Lee et al.
`
`(10) Patent No.:
`(45) Date of Patent:
`
`US 7.444,172 B1
`Oct. 28, 2008
`
`(54) DEVICE AND METHOD FOR CONTROLLING
`RADIO MOBILE TERMINAL CONNECTED
`TO HANDS-FREEKIT
`
`(75) Inventors: Dong-Jin Lee, Suwon-shi (KR);
`Byung-Hun Hwang, Suwon-shi (KR);
`Chul-Gyoo Park, Yongin-shi (KR):
`Young-Seoung Joo, Seoul (KR)
`(73) Assignee: Samsung Electronics Co., Ltd. (KR)
`(*) Notice:
`Subject to any disclaimer, the term of this
`patent is extended or adjusted under 35
`U.S.C. 154(b) by 0 days.
`(21) Appl. No.: 09/457,817
`
`Dec. 9, 1999
`(22) Filed:
`Foreign Application Priority Data
`(30)
`Dec. 9, 1998
`(KR) ............................... 1998-53952
`
`(51) Int. Cl.
`(2006.01)
`H04O 7/20
`(52) U.S. Cl. ........................ 455/569; 455/567; 455/573
`(58) Field of Classification Search ................. 455/569,
`455/90, 567,575,572, 573, 345
`See application file for complete search history.
`References Cited
`
`(56)
`
`U.S. PATENT DOCUMENTS
`
`5,802,167 A * 9/1998 Hong ......................... 379,388
`5,812,954. A * 9/1998 Henriksson ....
`... 455,550
`5,864,766 A *
`1/1999 Chiang ..........
`... 455,572
`5,898,908 A * 4/1999 Griffin ...
`... 455,127
`6,173,195 B1* 1/2001 Chen ......
`... 455,567
`6,314,307 B1 * 1 1/2001 Charron ...................... 455,573
`
`* cited by examiner
`Primary Examiner Daniel Hunter
`Assistant Examiner—Khawar Iqbal
`(74) Attorney, Agent, or Firm The Farrell Law Firm, P.C.
`(57)
`ABSTRACT
`
`A device and method for automatically controlling power of
`a radio mobile terminal connected to a hands-free kit and for
`preventing the radio mobile terminal from malfunctioning. In
`a power control method for automatically turning on a radio
`mobile terminal connected to a hands-free kit, the radio
`mobile terminal including a power control signal generator, a
`signal output terminal and a signal input terminal, the hands
`free kit including a power-on signal generator and a signal
`detector, a power-on signal is Supplied to the signal input
`terminal for a predetermined time period through the power
`on signal generator when the radio mobile terminal is con
`nected to the hands-free kit. After the predetermined time
`period elapses, generating the power-on signal is stopped. It is
`determined if the driving signal generated by the signal output
`terminal is detected through the signal detector. If the driving
`signal is detected, generating the power-on signal is stopped.
`
`5,367,556 A * 1 1/1994 Marui ......................... 379.58
`
`5 Claims, 4 Drawing Sheets
`
`
`
`400
`
`CONNECTED
`O HANDS-FRE
`
`
`
`
`
`YES
`GENERATE POWER-ON
`SIGNAL
`
`STOP GENERATING
`POWER-ON SIGNAL
`
`450
`
`DRIVING
`SIGNAL DETECTED
`
`
`
`YES
`STOP GENERATING
`POWER-ON SIGNAL
`
`440
`
`Qualcomm, Exh. 2016, p. 1
`Apple v. Qualcomm, IPR2018-01275
`
`

`

`U.S. Patent
`
`Oct. 28, 2008
`
`Sheet 1 of 4
`
`US 7.444,172 B1
`
`
`
`HAND-FREEKIT-200
`
`POWER
`110 CONTROL 150-SCHING
`CIRCUIT
`SIGNAL
`
`CURL CORD HANDS-FREEKIT
`RADIO MOBILE
`TERMINAL
`
`
`
`
`
`
`
`
`
`
`
`DRIVING
`SIGNAL
`
`BATTERY
`
`
`
`POWER
`CONTROL
`SIGNAL
`GENERATOR
`
`
`
`
`
`O
`O
`SWITCH
`
`INPUT
`TERMINAL
`
`FIG. 1
`
`Qualcomm, Exh. 2016, p. 2
`Apple v. Qualcomm, IPR2018-01275
`
`

`

`US. Patent
`
`
`
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`
`Qualcomm, Exh. 2016, p. 3
`Apple v. Qualcomm, |PR2018—01275
`
`Qualcomm, Exh. 2016, p. 3
`Apple v. Qualcomm, IPR2018-01275
`
`
`

`

`U.S. Patent
`
`Oct. 28, 2008
`
`Sheet 3 of 4
`
`US 7.444,172 B1
`
`
`
`3|E}}-|–SGNWH0800 T800
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`
`
`TWNIWÈBl_3]|80W 0|0\}}______________|__|____________________________________VI_____ | |X|
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`OZZ
`
`
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`
`
`Qualcomm, Exh. 2016, p. 4
`Apple v. Qualcomm, IPR2018-01275
`
`

`

`U.S. Patent
`
`Oct. 28, 2008
`
`Sheet 4 of 4
`
`US 7.444,172 B1
`
`CONNECTED
`O HANDS-FRE
`T?
`YES
`GENERATE POWER-ON
`SIGNAL
`
`
`
`STOP GENERATING
`POWER-ON SIGNAL
`
`
`
`30 4.
`
`
`
`DRIVING
`SIGNAL DETECTED?
`
`YES
`STOP GENERATING
`POWER-ON SIGNAL
`
`440
`
`FIG. 4
`
`Qualcomm, Exh. 2016, p. 5
`Apple v. Qualcomm, IPR2018-01275
`
`

`

`US 7,444,172 B1
`
`1.
`DEVICE AND METHOD FOR CONTROLLING
`RADIO MOBILE TERMINAL CONNECTED
`TO HANDS-FREEKIT
`
`2
`the power-on signal depending on whether the driving signal
`generated by the signal output terminal is detected through
`the signal detector.
`
`PRIORITY
`
`BRIEF DESCRIPTION OF THE DRAWINGS
`
`This application claims priority to an application entitled
`“Device and Method for Controlling Radio Mobile Terminal
`Connected to Hands-Free Kit' filed in the Korean Industrial
`Property Office on Dec. 9, 1998 and assigned Serial No.
`98-53952, the contents of which are hereby incorporated by
`reference.
`
`BACKGROUND OF THE INVENTION
`
`10
`
`15
`
`The above and other objects, features and advantages of the
`present invention will become more apparent from the fol
`lowing detailed description when taken in conjunction with
`the accompanying drawings in which:
`FIG. 1 is a schematic block diagram illustrating a power
`control device for preventing a radio mobile terminal con
`nected to a hands-free kit from malfunctioning during a call in
`accordance with an embodiment of the present invention;
`FIG. 2 is a circuit diagram illustrating the power control
`device of FIG. 1;
`FIG. 3 is a circuit diagram illustrating a power control
`device for controlling power of a radio mobile terminal con
`nected to a hands-free kit inaccordance with another embodi
`ment of the present invention; and
`FIG. 4 is a flow chart illustrating the operation of the power
`control device of FIG. 3.
`
`1. Field of the Invention
`The present invention relates to power control for a radio
`mobile terminal connected to a hands-free kit, and in particu
`lar, to a device and method for automatically controlling
`power of a radio mobile terminal connected to a hands-free kit
`and for preventing the radio mobile terminal from malfunc
`tioning.
`2. Description of the Related Art
`Typically, a hands-free kit for a radio mobile terminal is
`mounted in a vehicle to allow convenient, hands-free use of
`the radio mobile terminal. However, if the radio mobile ter
`minal has its power switched off when connected to the
`hands-free kit, a user must turn on the power of the radio
`mobile terminal in addition to connecting the terminal to the
`hands-free kit. Also, if the radio mobile terminal's battery is
`completely discharged when connected to the hands-free kit,
`the user must turn on the power by pressing a power key on a
`keypad of the radio mobile terminal prior to making a call.
`Moreover, during a call, if a signal generated by the hands
`free kit is applied to a signal input terminal which is con
`nected to the power key on the key pad of the radio mobile
`terminal to receive a power-on or power-off signal, a commu
`nication path is cut off, ending the call.
`
`25
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`35
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`SUMMARY OF THE INVENTION
`
`40
`
`It is, therefore, an object of the present invention to provide
`a device and method for automatically Switching on power of
`a radio mobile terminal connected to a hands-free kit.
`It is another object of the present invention to provide a
`device for preventing malfunction of a radio mobile terminal,
`which may be generated during a call as a Voltage of a hands
`free kit is applied to a signal input terminal of the radio mobile
`terminal.
`To achieve these and other objects of the present invention,
`there is provided a power control device for automatically
`turning on power of a radio mobile terminal connected to a
`hands-free kit, including a power control signal generator in
`the radio mobile terminal for generating a power control
`signal to Supply power to the radio mobile terminal, a signal
`output terminal connected to the power control signal gen
`erator, for generating a driving signal to enable the power
`control signal generator, and a signal input terminal con
`nected to a power key of the radio mobile terminal, for receiv
`ing a power-on signal; and the hands-free kit including a
`power-on signal generator connected through a connector
`between the power key and the signal input terminal, for
`generating the power-on signal, a signal detector connected
`through the connector between the signal output terminal and
`the power control signal generator, for detecting the driving
`signal generated by the signal output terminal, and a control
`ler for controlling the power-on signal generator to generate
`
`45
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`50
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`55
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`60
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`65
`
`DETAILED DESCRIPTION OF THE PREFERRED
`EMBODIMENT
`
`Preferred embodiments of the present invention will be
`described hereinbelow with reference to the accompanying
`drawings. In the following description, numerous specific
`details are set forth to provide a more thorough understanding
`of the present invention. It will be apparent, however, to one
`skilled in the art the present invention may be practiced with
`out these specific details. In other instances, well-known
`functions or constructions are not described in detail since
`they would obscure the invention in unnecessary detail.
`Generally, a hands-free kit is connected to a radio mobile
`terminal through a curl cord or connector. Within the curl
`cord, lines RX-AUDIO, TX-AUDIO, DC-GROUND, CF
`(Current Feedback), and HP-POWER are connected to the
`radio mobile terminal. In the present invention, the
`HP-POWER line is used for power control.
`FIG. 1 illustrates a power control circuit for preventing a
`radio mobile terminal from malfunctioning when the radio
`mobile terminal is connected to a hands-free kit while making
`a call.
`Referring to FIG. 1, a power control signal generator 100
`generates a power control signal to supply power to the radio
`mobile terminal. A signal output terminal 140 is connected to
`the power control signal generator 100 and generates a driv
`ing signal for enabling the power control signal generator
`100. A signal input terminal 130 is connected to a switch 120
`on a keypad of the radio mobile terminal and receives a power
`on/off signal. A switching circuit 150 has an input terminal
`connected to a terminal for connecting the hands-free kit and
`has an output terminal connected between the signal output
`terminal 140 and the power control signal generator 100 and
`between the switch 120 and the signal input terminal 130. The
`switching circuit 150 is enabled or disabled by the driving
`signal provided from the signal output terminal 140. A con
`troller (not shown) controls the signal output terminal 140 to
`generate the driving signal according to a signal applied to the
`signal input terminal 130.
`Typically, the radio mobile terminal uses a dual purpose
`key having two functions, one being power control, in order to
`reduce the area occupied by the keypad. For instance, the
`radio mobile terminal shares a power key on the keypad with
`a communication path cutoff key. If the user presses an END/
`
`Qualcomm, Exh. 2016, p. 6
`Apple v. Qualcomm, IPR2018-01275
`
`

`

`US 7,444,172 B1
`
`5
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`10
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`15
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`3
`POWER key on the keypad for a long time, the switch 120
`turns on/off the power. If the user presses the END/POWER
`key during a call, the switch 120 ends the call. The signal
`generated through the Switch 120 is applied to the signal input
`terminal 130 in the controller (not shown) to turn the power on
`or off or to end a call. If the signal generated through the
`Switch 120 is a power on signal, the driving signal is gener
`ated through the signal output terminal. The driving signal is
`applied to the power control signal generator 100 to cause the
`power control signal generator 100 to operate. The power
`control signal generator 100 provides the power control sig
`nal to a power Supply (not shown) so as to Supply the power to
`the radio mobile terminal.
`In the prior art, if the radio mobile terminal is connected to
`the hands-free kit while making a call, the HP-POWER line of
`the hands-free kit is connected between the signal output
`terminal 140 and the power control signal generator 100 and
`between the switch 120 and the signal input terminal 130.
`Then a signal of the HP-POWER line is applied to the signal
`input terminal 130 and the communication path is cut off,
`ending the call.
`In the present invention, however, the switching circuit 150
`prevents such a malfunction. The switching circuit 150 is
`enabled or disabled by the driving signal provided from the
`signal output terminal 140. When disabled, the switching
`circuit 150 prevents the signal generated by the hands-free kit
`200 from being switched to the radio mobile terminal.
`FIG. 2 is a detailed circuit diagram of the power control
`device of FIG. 1. An NPN transistor Q1 is used in the power
`control signal generator 100. The switching circuit 150
`includes a first resistor R11 interposed between a terminal for
`connecting the hands-free kit 200 and ground. The switching
`circuit 150 also includes a second resistor R12 interposed
`between the hands-free kit terminal and the signal output
`terminal 140, and includes a PNP transistor Q2 having an
`emitter connected to the hands-free kit terminal and a collec
`tor connected between the signal output terminal 140 and the
`power control signal generator 100. The switching circuit 150
`further includes a third resistor R13 interposed between a
`base of the transistor Q2 and output terminal 140.
`If the signal output terminal 140 is logic “high”, that is, if
`the driving signal is generated, the transistor Q2 is turned off
`and thus the signal applied to the HP-POWER line is cut off.
`Since the radio mobile terminal is switched on during a call,
`the driving signal for controlling the power of the radio
`mobile terminal becomes logic “high”.
`FIG.3 illustrates a power control device for controlling the
`power of a radio mobile terminal connected to a hands-free kit
`according to another embodiment of the present invention.
`Referring to FIG. 3, the radio mobile terminal includes a
`power control signal generator 100 for generating a power
`control signal to Supply power to the radio mobile terminal. A
`signal output terminal 140 is connected to the power control
`signal generator 100 and generates a driving signal for
`enabling the power control signal generator 100. A signal
`input terminal 130 is connected to a switch 120 (power key)
`and receives a power-on signal. The hands-free kit includes a
`power-on signal generator 220 connected through a connec
`tor (curl cord) between the switch 120 and the signal input
`terminal 130 to generate the power-on signal. The hands-free
`kit also includes a signal detector 230 connected through the
`connector between the signal output terminal 140 and the
`power control signal generator 100 to detect the driving signal
`provided from the signal output terminal 140. The hands-free
`kit further includes a controller 210 for controlling the power
`on signal generator 220 to generate the power-on signal
`
`4
`depending on whether the driving signal generated by the
`signal output terminal 140 is detected through the signal
`detector 230.
`FIG. 4 is a flow chart illustrating the operation of the power
`control device of FIG. 3.
`Referring to FIG.4, the controller 210 of the hands-free kit
`determines if the radio mobile terminal is connected to the
`hands-free kit at step 400, by sensing whether two DC-ground
`terminals of the hands-free kit are shorted by the radio mobile
`terminal. If the radio mobile terminal is connected to the
`hands-free kit, the controller 210 directs the power-on signal
`generator 220 to generate the power-on signal for a predeter
`mined time period (about 300 ms) at step 410. The power-on
`signal is the same as the signal generated through the Switch
`120 to drive the power control signal generator 100. The
`controller 210 directs the power-on signal generator 220 to
`stop generating the power-on signal at step 420. The control
`ler 210 then checks through the signal detector 230 whether
`the driving signal is generated by the signal output terminal
`140 at step 430. The power-on signal generated through step
`410 is then applied to the signal input terminal 130 and a
`controller (not shown) of the radio mobile terminal detects the
`power-on signal as a power-on command. Typically, if the
`switch 120 is pressed for a prescribed time period, the power
`is Switched on. Similarly, if the power-on signal is applied to
`the signal input terminal 130 for a prescribed time period, the
`controller of the radio mobile terminal determines that the
`power-on command is received. The controller of the radio
`mobile terminal then directs the signal output terminal 140 to
`generate the driving signal. If the power of the radio mobile
`terminal is Switched on, the signal output terminal 140 gen
`erates a logic “high’ signal (i.e., driving signal) and the radio
`mobile terminal is maintained at a power-on state. It can be
`determined whether the radio mobile terminal is switched on
`by detecting the driving signal with the signal detector 230. If
`the radio mobile terminal is in a power-on state, the controller
`210 directs the power-on signal 220 to stop generating the
`power-on signal at step 440. If the radio mobile terminal is not
`in a power-on state at step 430, when no driving signal is
`detected, the controller 210 returns to step 410.
`In the second embodiment of the present invention
`described with reference to FIGS. 3 and 4, the controller 210,
`power-on signal generator 220 and signal detector 230 may
`be comprised of a single chip, and the signal detector 230 may
`be connected to a GPIO (General Purpose Input Output) port
`of the chip.
`While the invention has been shown and described with
`reference to certain preferred embodiments thereof, it will be
`understood by those skilled in the art that various changes in
`form and details may be made therein without departing from
`the spirit and scope of the invention as defined by the
`appended claims.
`What is claimed is:
`1. A power control device for automatically turning on
`power to a radio mobile terminal connected to a hands-free
`kit, comprising:
`a circuit in said radio mobile terminal comprising a power
`control signal generator for generating a power control
`signal to Supply power to said radio mobile terminal, a
`signal output terminal connected to said power control
`signal generator, for generating a driving signal to
`enable said power control signal generator, and a signal
`input terminal connected to a power key of said radio
`mobile terminal, for receiving a power-on signal; and
`a circuit in said hands-free kit comprising a power-on sig
`nal generator connected between said power key and
`said signal input terminal, for generating said power-on
`
`25
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`Qualcomm, Exh. 2016, p. 7
`Apple v. Qualcomm, IPR2018-01275
`
`

`

`US 7,444,172 B1
`
`5
`signal, a signal detector connected between said signal
`output terminal and said power control signal generator,
`for detecting said driving signal generated by said signal
`output terminal, and a controller for controlling said
`power-on signal generator to generate said power-on
`signal depending on whether said driving signal gener
`ated by said signal output terminal is detected through
`said signal detector.
`2. A power control method for automatically turning on
`power to a radio mobile terminal connected to a hands-free
`kit, a circuit in said radio mobile terminal including a power
`control signal generator for generating a power control signal
`to supply power to said radio mobile terminal, a signal output
`terminal for generating a driving signal to enable said power
`control signal generator, and a signal input terminal con
`nected to a power key of said radio mobile terminal, for
`receiving a power-on signal, and circuit in said hands-free kit
`including a power-on signal generator connected between
`said power key and said signal input terminal, for generating
`said power-on signal, and a signal detector connected
`between said signal output terminal and said power control
`signal generator, for detecting said driving signal generated
`by said signal output terminal, said method comprising the
`steps of:
`Supplying said power-on signal to said signal input termi
`nal for a predetermined time period through said power
`on signal generator when said radio mobile terminal is
`connected to said hands-free kit;
`determining if said driving signal generated by said signal
`output terminal is detected through said signal detector;
`and
`terminating said power-on signal upon detection of said
`driving signal.
`3. The power control method as claimed in claim 2, further
`comprising the step of returning to said step of supplying said
`power-on signal if said driving signal is not detected.
`
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`6
`4. A power control device for preventing malfunction of a
`radio mobile terminal connected to a hands-free kit during a
`call, comprising:
`a power control signal generator for generating a power
`control signal to Supply power to said radio mobile ter
`minal;
`a signal output terminal connected to said power control
`signal generator, for generating a driving signal to
`enable said power control signal generator;
`a signal input terminal connected to a power key on a key
`pad of said radio mobile terminal, for receiving a power
`on/off signal;
`a Switching circuit having an input terminal connected to
`said hands-free kit and having an output terminal con
`nected between said signal output terminal and said
`power control signal generator and between said power
`key and said signal input terminal, wherein said Switch
`ing circuit is enabled or disabled according to said driv
`ing signal provided from said signal output terminal; and
`a controller for controlling said signal output terminal to
`generate said driving signal according to said power
`on/off signal applied to said signal input terminal.
`5. The power control device as claimed in claim 4, wherein
`said Switching circuit includes:
`a first resistor interposed between said hands-free kit and
`ground;
`a second resistor interposed between said hands-free kit
`and said signal output terminal;
`a PNP transistor having an emitter connected to the hands
`free kit and a collector connected between said signal
`output terminal and said power control signal generator;
`and
`a third resistor interposed between a base of said PNP
`transistor and said signal output terminal.
`
`k
`
`k
`
`k
`
`k
`
`k
`
`Qualcomm, Exh. 2016, p. 8
`Apple v. Qualcomm, IPR2018-01275
`
`