US20040204022A1 - Mobile terminal - Google Patents

Mobile terminal Download PDF

Info

Publication number
US20040204022A1
US20040204022A1 US10405368 US40536803A US2004204022A1 US 20040204022 A1 US20040204022 A1 US 20040204022A1 US 10405368 US10405368 US 10405368 US 40536803 A US40536803 A US 40536803A US 2004204022 A1 US2004204022 A1 US 2004204022A1
Authority
US
Grant status
Application
Patent type
Prior art keywords
processing
unit
clock
frequency
signal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US10405368
Inventor
Tamotsu Ito
Katsuki Ikuta
Masayoshi Kuroda
Tsukasa Hasegawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi 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

Links

Images

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATIONS NETWORKS
    • H04W52/00Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02Power saving arrangements
    • H04W52/0209Power saving arrangements in terminal devices
    • H04W52/0261Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level
    • H04W52/0287Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level changing the clock frequency of a controller in the equipment
    • H04W52/029Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level changing the clock frequency of a controller in the equipment reducing the clock frequency of the controller
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details 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
    • H04B1/38Transceivers, 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
    • H04B1/40Circuits
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M1/00Substation equipment, e.g. for use by subscribers; Analogous equipment at exchanges
    • H04M1/72Substation extension arrangements; Cordless telephones, i.e. devices for establishing wireless links to base stations without route selecting
    • H04M1/725Cordless telephones
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02DCLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THIR OWN ENERGY USE
    • Y02D70/00Techniques for reducing energy consumption in wireless communication networks
    • Y02D70/40According to the transmission technology

Abstract

There is provided a cellular phone taking into consideration enhancement in processing speed and reduction in current consumption, and the cellular phone comprises a processing unit capable of executing plural kinds of processing, an oscillator for generating a clock signal to be fed to the processing unit, and a clock controller for converting the frequency of the clock signal received from the oscillator, wherein the clock controller changes the frequency of the clock signal for each of the plural kinds of the processing in response to the control by the central processing unit.

Description

    BACKGROUND OF THE INVENTION
  • [0001]
    The present invention relates to a cellular phone comprising a central processing unit (CPU).
  • [0002]
    A hand-held terminal or mobile terminal, for switching the frequency of a clock signal delivered from the side of an application program, is disclosed in JP-A NO. 73237/1999 (Heisei 11).
  • [0003]
    Further, in JP-A No. 148475/2000, there is disclosed a computer for a mobile unit, capable of switching a clock frequency to a high-speed mode frequency higher than a normal frequency when conditions, such as power source voltage, ambient temperature, and so forth, are satisfied.
  • [0004]
    In the case of the conventional technology described above, speed control of a clock signal has been implemented by an application program or has been dependent on the conditions such as power source voltage, ambient temperature, and so forth, so that there is no room for interposition of the will of a user in switching the speed of the clock signal. Further, if the CPU is driven at a high frequency, there has been a tendency toward an increase in current consumption although a processing speed is enhanced. With a cellular phone, in particular, since its battery capacity is small, there has been a risk of premature depletion of the battery capacity occurring when the clock signal has been automatically switched over to the high-speed side without knowledge of the user.
  • SUMMARY OF THE INVENTION
  • [0005]
    To attain both enhancement in processing speed and reduction in current consumption, it is an object of the invention to provide a mobile terminal comprising clock control means capable of changing the frequency of a clock signal received from an oscillator under control by a central processing unit, and converting an operation frequency of the central processing unit to a different frequency, wherein a clock signal at the different frequency as converted by the clock control means becomes a clock signal of the central processing unit.
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • [0006]
    [0006]FIG. 1 is a block diagram showing the configuration of a first embodiment of a cellular phone according to the invention;
  • [0007]
    [0007]FIG. 2 is a block diagram showing the configuration of a second embodiment of a cellular phone according to the invention;
  • [0008]
    [0008]FIG. 3 is a block diagram showing the configuration of a third embodiment of a cellular phone according to the invention;
  • [0009]
    [0009]FIG. 4 is a block diagram showing the configuration of a fourth embodiment of a cellular phone according to the invention; and
  • [0010]
    [0010]FIG. 5 is a graph showing the relationship between an operation frequency of a central processing unit of the cellular phone according to the first to fourth embodiments, respectively, and current consumption.
  • [0011]
    Other and further objects, features and advantages of the invention will appear more fully from the following description.
  • DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
  • [0012]
    A first embodiment of a cellular phone according to the invention is described hereinafter with reference to FIGS. 1 and 5. FIG. 1 is a block diagram showing the internal configuration of the cellular phone according to the first embodiment.
  • [0013]
    A central processing unit (CPU) 100 controls the operation of the cellular phone in accordance with a control program stored in a memory 110. The CPU 100 performs operation in accordance with an input pushbutton as pressed via an operation panel (input pushbutton group) 120, executing processing in response to the input pushbutton as pressed.
  • [0014]
    Upon dialing, a telephone number as inputted from the operation panel 120 is shown on a display unit 130, a speech signal delivered from a speech input unit (microphone) 140 is sent out in the form of radio waves from an antenna 160 to the outside via a transmit/receive unit 150 in accordance with a transmission directive delivered from the operation panel 120.
  • [0015]
    At the time of signal reception, radio waves from the outside are received by the antenna 160, and upon recognition by the transmit/receive unit 150 that the radio waves received are radio waves corresponding to a telephone number dedicated to the present cellular phone, speech is delivered from a speech output unit (speaker) 170.
  • [0016]
    The CPU 100 receives a clock signal from an oscillator 180 through the intermediary of a clock controller 200. Because an operation frequency of the CPU 100 is dependent on the frequency of the clock signal as received, a processing speed of the CPU 100 is regulated by the frequency of the clock signal. The clock controller 200 converts the frequency of the clock signal into any suitable frequency by use of a PLL (Phase Locked Loop) circuit under control by the CPU 100, and the clock signal is delivered to the CPU 100 as a clock signal of the CPU 100. The frequency of the clock signal delivered to the CPU 100 becomes the operation frequency of the CPU 100.
  • [0017]
    [0017]FIG. 5 is a graph showing the relationship between the operation frequency and current consumption. In proportion as the frequency of the clock signal is changed to a higher frequency, the operation frequency of the CPU 100 becomes higher, thereby enhancing the processing speed of the CPU 100 although current consumption increases.
  • [0018]
    With the present embodiment, when executing a specific processing, the frequency of the clock signal of the CPU 100 is caused to change to a higher frequency, thereby enhancing the processing speed. Upon completion of the execution of the specific processing, the frequency of the clock signal of the CPU 100 is caused to change to a lower frequency, thereby reducing current consumption. In the initial condition at the time when power is turned on, the frequency of the clock signal of the CPU 100 is set to a low frequency in order to reduce current consumption.
  • [0019]
    Herein, the specific processing refers to, for example, processing for image decoding, address retrieval processing, and application processing such as kana-kanji conversion processing used in entering characters. These processing often have effects on the response of the user.
  • [0020]
    With the present embodiment, the user can change the operation frequency of the CPU 100 by changing the output frequency of the clock controller 200 at will with the use of a clock manipulation unit 300 connected with the CPU 100.
  • [0021]
    If the user enters a request for change via the clock manipulation unit 300, the CPU 100 receives an input from the clock manipulation unit 300, and controls the clock controller 200, thereby controlling a clock frequency to be fed to the CPU 100. That is, in response to the input from the clock manipulation unit 300, the frequency of the clock signal to be fed to the CPU 100 is set.
  • [0022]
    Further, with the present embodiment, depending on an application to be used, and use environments, the user can change the frequency of the clock signal in every processing. For example, if the user wants to increase the processing speed of the CPU 100, the frequency of the clock signal can be raised, and if the user wants to reduce current consumption, the frequency of the clock signal can be changed to a lower frequency. By virtue of such a function as described, the user can set the frequency of the clock signal as appropriate at will depending on the user's use environments, such as the user desire to execute high speed processing, or to use the cellular phone for many hours, the amount of the actual battery capacity that remains in a battery being small, and so forth, so that operability can be enhanced.
  • [0023]
    In FIG. 1, the clock manipulation unit 300 is shown as a single pushbutton (clock manipulation pushbutton), but may be made up of a plurality of keys instead. In order to implement the clock manipulation unit 300 with the single pushbutton, for example, the lowest frequency is set as the initial condition of the frequency of the clock signal, thereby carrying out control such that every time when the single pushbutton is once operated, the frequency of the clock signal of the CPU 100 is changed to sequentially higher frequencies by stages. The frequency is changed cyclically, and if the frequency of the clock signal of the CPU 100 is changed to the highest frequency, upon operation of the single pushbutton the next time, the frequency of the clock signal of the CPU 100 reverts to the lowest frequency. Thus, every time when the single pushbutton is operated, the output frequency of the clock controller 200 can be changed, thereby enabling the operation frequency of the CPU 100 to be changed.
  • [0024]
    The CPU 100 causes the display unit 130 to display a numerical value of the frequency after changed in such a way as to explicitly advise the user of the frequency of the clock signal after changed. Since it is sufficient for such display to indicate simply which stage the processing speed of the CPU 100 is in, indication of a specific numerical value of the frequency is not necessarily required. Numbers to indicate respective stages, such as 1, 2 , 3 . . . , or characters such as high, middle, low, etc. may be displayed. Alternatively, the respective stages of the processing speed may be displayed in number of stars, exhibiting one star on the display unit 130 for the lowest speed, increasing the number of stars exhibited on the display unit 130 in ascending order of the stage. Otherwise, the status of the processing speed may be displayed with the use of a bar graph, icons, and so forth.
  • [0025]
    Further, for changing the output frequency of the clock controller 200 at the user's will, there may be adopted a method whereby an operation menu directing change of the frequency of the clock signal is caused to be displayed on the display unit 130 without the use of the clock manipulation pushbutton, and the user selects or directs at will the output frequency of the clock controller 200 by use of the operation panel 120, thereby changing the operation frequency of the CPU 100. In such a case, the operation panel 120 functions as the clock manipulation unit 300, so that the clock manipulation unit 300 can be omitted.
  • [0026]
    Now, a second embodiment of a cellular phone according to the invention is described hereinafter with reference to FIG. 2. FIG. 2 is a block diagram showing the internal configuration of the cellular phone according to the second embodiment.
  • [0027]
    With the present embodiment, a central processing unit (CPU) is made up so as to be divided into a first central processing unit 400 concerned with transmit/receive of signals, and a second central processing unit 410 handling processing that has effects on the response of a user. In FIG. 2, blocks denoted by the same reference numerals as those in FIG. 1 correspond to those blocks of the first embodiment, having the same functions.
  • [0028]
    The first central processing unit 400 controls operation concerned with transmit/receive by the cellular phone in accordance with a control program stored in a first memory 420, and the second central processing unit 410 controls operation concerned with processing that has effects on the response of a user in accordance with a control program stored in a second memory 430. More specifically, the second central processing unit 410 controls operation concerned with processing of an application program.
  • [0029]
    A clock signal from an oscillator 180 is directly delivered to the first central processing unit 400 as a clock signal. Meanwhile, a clock signal at any suitable frequency converted by control of the second central processing unit 410 is delivered to the second central processing unit 410 through the intermediary of a clock controller 200.
  • [0030]
    With such a configuration as described, when executing a specific processing, the frequency of the clock signal delivered to the second central processing unit 410 can be changed to a high frequency, thereby enhancing a processing speed, and upon completion of execution of the processing that has effects on the response of the user, the frequency of the clock signal delivered to the second central processing unit 410 can be changed to a low frequency, thereby reducing current consumption.
  • [0031]
    For example, during a standby (waiting) period for communications by the cellular phone, the first central processing unit 400 is in intermittent operation to receive radio waves from the outside via an antenna 160, executing processing for recognition by the transmit/receive unit 150 that the radio waves received are radio waves corresponding to a telephone number dedicated to the present cellular phone. In this case, the frequency of the clock signal delivered to the second central processing unit 410 is changed to a low frequency to thereby reduce current consumption. As shown FIG. 5, the relationship between an operation frequency and current consumption is such that in proportion as the operation frequency becomes higher, the current consumption increases while in proportion as the operation frequency becomes lower, the current consumption decreases.
  • [0032]
    The cellular phone shown in FIG. 2 further comprises a power supply controller 500. The power supply controller 500 controls power to be supplied from a battery 510 to the second central processing unit 410 in response to control by the first central processing unit 400. For example, during a standby (waiting) period for communications by the cellular phone or upon completion of the processing by the second central processing unit 410, the power supply controller 500 can turn off power to be supplied to the second central processing unit 410 in response to control by the first central processing unit 400. Since the second central processing unit 410 handles application, its power consumption at the time of processing is large, and consequently, effective saving in power can be attained by controlling the power supplied.
  • [0033]
    Next, a third embodiment of a cellular phone according to the invention is described hereinafter with reference to FIG. 3.
  • [0034]
    The cellular phone shown in FIG. 3 comprises a battery voltage detector 600 in place of the power supply controller 500 incorporated in the cellular phone shown in FIG. 2. In FIG. 3, blocks denoted by the same reference numerals as those in FIG. 2 have the same functions as those of the blocks of the second embodiment, omitting therefore description thereof.
  • [0035]
    The battery voltage detector 600 detects a voltage of a battery 510. A first central processing unit 400 determines whether or not the voltage detected is lower than a predetermined value. In the case where it is determined that the amount of the actual battery capacity that remains in the battery 510 is less than a predetermined amount, the frequency of a clock signal delivered to a second central processing unit 410 is changed to a lower frequency even when executing a specific processing, thereby reducing current consumption. Hence, it is possible to effect control so as to reduce current consumption in case that the amount of the actual battery capacity that remains in the battery becomes small, thereby prolonging operable time of the cellular phone.
  • [0036]
    Further, a fourth embodiment of a cellular phone according to the invention is described hereinafter with reference to FIG. 4. FIG. 4 is a block diagram showing the internal configuration of the cellular phone of a folded structure, according to the fourth embodiment. In FIG. 4, blocks denoted by the same reference numerals as those in FIGS. 2 and 3, respectively, have the same functions as those of the blocks of the second and third embodiments, respectively, omitting therefore description thereof.
  • [0037]
    The cellular phone shown in FIG. 4 comprises a folding condition detector 700 for detecting whether the cellular phone is in a folded (closed) condition or in an unfolded (open) condition.
  • [0038]
    With the cellular phone according to the present embodiment, a first display unit 710 and a second display unit 720 are added to a first central processing unit 400 and a second central processing unit 410, respectively. The first display unit 710 is disposed at a position as can be seen by a user even in the folded condition. The second display unit 720 is disposed at the folded-down side of the cellular phone.
  • [0039]
    Since the operation of the cellular phone in the open condition is the same as that of the cellular phone according to the second and third embodiments, respectively, the operation of the cellular phone in the closed condition is described hereinafter.
  • [0040]
    Normally, in the closed condition, the cellular phone is often on standby (waiting) for cellular phone communications, and the first central processing unit 400 is in intermittent operation to receive radio waves from the outside via an antenna 160, executing processing for recognition through the intermediary of a transmit/receive unit 150 that the radio waves received are radio waves corresponding to a telephone number dedicated to the present cellular phone. Meanwhile, since a load on the second central processing unit 410 is light at this point in time, the frequency of a clock signal delivered to the second central processing unit 410 can be changed to a low frequency, thereby reducing power consumption. When executing a specific processing even in the closed condition, the frequency of the clock signal delivered to the second central processing unit 410 is caused to change to a higher frequency, thereby enhancing a processing speed, and upon completion of execution of the specific processing, the frequency of the clock signal is caused to change to a low frequency, thereby reducing current consumption.
  • [0041]
    Further, in the closed condition, the user is unable to see the second display unit 720. Accordingly, as for processing concerning the second display unit 720, upon detection of the closed condition, the frequency of the clock signal delivered to the second central processing unit 410 is caused to change to a low frequency, thereby enabling current consumption to be reduced.
  • [0042]
    Furthermore, even when executing the specific processing, the frequency of the clock signal delivered to the second central processing unit 410 may be changed to a low frequency in the case of the closed condition. In the case of the cellular phone being in the closed condition, the user does not look at a display screen of the cellular phone, and is often in no hurry to do processing. Accordingly, in the case of the closed condition, processing can be executed while reducing power consumption by changing the frequency of the clock signal to a lower frequency. When the cellular phone is shifted to the open condition, the processing speed is enhanced by changing the frequency of the clock signal delivered to the second central processing unit 410 to a higher frequency.
  • [0043]
    The cellular phone shown in FIG. 4 further comprises a lighting controller 800 for controlling backlight of the second display unit 720. Since the user is unable to see the second display unit 720 in the folded condition, further reduction in power consumption can be attained by turning off the backlight of the second display unit 720.
  • [0044]
    In addition, the power supply controller 500 shown in FIG. 2 or the battery voltage detector 600 shown in FIG. 3 may be added to the cellular phone according to the present embodiment. In such a case, when the amount of the actual battery capacity that remains in the battery 510 is less than a predetermined amount, power consumption can be reduced and waiting time can be extended by implementing control such that the backlight of the second display 720 is turned off even in the open condition.
  • [0045]
    Still further, the operability of the cellular phone can be improved by providing the cellular phone shown in FIGS. 2 through 4, respectively, with the clock manipulation unit 300 shown FIG. 1, thereby enabling the user to change the frequency of the clock signal as with the case of the first embodiment. Also, the operation panel 120 may have the function of the clock manipulation unit 300.
  • [0046]
    The respective embodiments described hereinbefore may be carried out singly or in combination as appropriate.
  • [0047]
    With the embodiments described hereinbefore, the clock controller, the memories, and so forth are disposed outside of the central processing unit, however, these components together with the central processing unit may be integrated so as to be incorporated in one chip.
  • [0048]
    As described in the foregoing, with the embodiments of the invention, it is possible to attain both enhancement in the processing speed and reduction in the power consumption.
  • [0049]
    The foregoing invention has been described in terms of preferred embodiments. However, those skilled, in the art will recognize that many variations of such embodiments exist. Such variations are intended to be within the scope of the present invention and the appended claims.

Claims (10)

    What is claimed is:
  1. 1. A mobile terminal comprising:
    an antenna which transmits and receives radio waves;
    a transmit/receive unit connected with the antenna;
    an audio signal input unit which receives audio signals;
    an audio signal output unit which delivers audio signals;
    a central processing unit capable of executing plural kinds of processing;
    a display unit which displays under control by the central processing unit;
    an oscillator which generates a clock signal to be fed to the central processing unit; and
    a clock controller which converts the frequency of the clock signal received from the oscillator,
    wherein the clock controller changes the frequency of the clock signal for each of the plural kinds of the processing in response to the control by the central processing unit.
  2. 2. A mobile terminal according to claim 1, further comprising a directive input unit which enters a directive from a user, wherein when the user enters a request for change in processing speed or change in frequency from the directive input unit, the central processing unit controls the clock controller so as to change the frequency of the clock signal.
  3. 3. A mobile terminal according to claim 1, wherein when the frequency of the clock signal is changed by the clock controller, the central processing unit controls the display unit so as to exhibit a display concerning the change.
  4. 4. A mobile terminal according to claim 3, wherein the display unit exhibits a display corresponding to the magnitude of the frequency of the clock signal by use of a graphics or an image.
  5. 5. A mobile terminal according to claim 1, further comprising a memory that stores information concerning the frequency of the clock signal corresponding to each of the plural kinds of the processing, and the central processing unit controls the clock controller in response to the information stored in the memory.
  6. 6. A mobile terminal according to claim 1, wherein the central processing unit controls the clock controller in such a way as to lower the frequency of the clock signal when the amount of the battery capacity that remains in a battery becomes small.
  7. 7. A mobile terminal according to claim 1, further comprising a memory that stores a control program, wherein the central processing unit execute processing in accordance with the control program stored in the memory.
  8. 8. A mobile terminal comprising:
    an antenna for transmitting and receiving radio waves;
    a transmit/receive unit connected with the antenna;
    a first processing unit for controlling transmit/receive of signals by the transmit/receive unit;
    a second processing unit for executing processing of a plurality of application programs;
    an oscillator for generating a clock signal to be fed to the first processing unit and the second processing unit, respectively; and
    a clock controller for converting the frequency of the clock signal received from the oscillator,
    wherein the clock controller can change the frequency of the clock signal to be fed to the second processing unit for each of the plurality of the application programs.
  9. 9. A mobile terminal according to claim 8, further comprising a directive input unit for entering a directive from a user, wherein when the user enters a request for change in processing speed or change in frequency from the directive input unit, the central processing unit changes the frequency of the clock signal to be fed to the second processing unit.
  10. 10. A mobile terminal according to claim 8, wherein the clock controller controls the frequency of the clock signal so as to become lower when the amount of the battery capacity that remains in a battery becomes small.
US10405368 2002-04-03 2003-04-03 Mobile terminal Abandoned US20040204022A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2002100735A JP3879565B2 (en) 2002-04-03 2002-04-03 Mobile phone
JP2002-100735 2002-04-03

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US11480971 US7577417B2 (en) 2002-04-03 2006-07-06 Mobile terminal

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US11480971 Continuation US7577417B2 (en) 2002-04-03 2006-07-06 Mobile terminal

Publications (1)

Publication Number Publication Date
US20040204022A1 true true US20040204022A1 (en) 2004-10-14

Family

ID=29388481

Family Applications (2)

Application Number Title Priority Date Filing Date
US10405368 Abandoned US20040204022A1 (en) 2002-04-03 2003-04-03 Mobile terminal
US11480971 Active 2024-06-27 US7577417B2 (en) 2002-04-03 2006-07-06 Mobile terminal

Family Applications After (1)

Application Number Title Priority Date Filing Date
US11480971 Active 2024-06-27 US7577417B2 (en) 2002-04-03 2006-07-06 Mobile terminal

Country Status (2)

Country Link
US (2) US20040204022A1 (en)
JP (1) JP3879565B2 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1575178A3 (en) * 2004-03-12 2005-11-16 Nec Corporation Mobile data terminal and communication method therefor
US20050284940A1 (en) * 2004-06-29 2005-12-29 Felica Networks, Inc. Data processing apparatus, data processing method, and portable communication terminal apparatus
US20070180282A1 (en) * 2006-02-02 2007-08-02 Lg Electronics Inc. Power-saving control apparatus and method for a portable computer
US20080076485A1 (en) * 2006-09-27 2008-03-27 Hoo-Sung Lee Method for controlling low-power state in mobile handset
WO2009040329A1 (en) * 2007-09-27 2009-04-02 Telefonaktiebolaget L M Ericsson (Publ) Single multi-mode clock source for wireless devices
EP2407793A1 (en) * 2009-06-26 2012-01-18 Panasonic Corporation Electronic part and method of detecting faults therein

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6070321B2 (en) * 2013-03-21 2017-02-01 富士通株式会社 Portable information terminals, control method, control program

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020029352A1 (en) * 1998-12-30 2002-03-07 Shekhar Y. Borkar Software control of transistor body bias in controlling chip parameters
US20020040442A1 (en) * 2000-10-02 2002-04-04 Nobutaka Ishidera Software processing apparatus and recording medium on which program is recorded
US6484041B1 (en) * 1998-10-07 2002-11-19 Nokia Mobile Phones, Ltd. Method for adjusting power consumption
US20020173344A1 (en) * 2001-03-16 2002-11-21 Cupps Bryan T. Novel personal electronics device

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0357007A (en) 1989-07-26 1991-03-12 Seiko Epson Corp Information processor
JPH05108195A (en) * 1991-10-11 1993-04-30 Toshiba Corp Portable computer
US5604531A (en) * 1994-01-17 1997-02-18 State Of Israel, Ministry Of Defense, Armament Development Authority In vivo video camera system
US5715524A (en) * 1995-02-06 1998-02-03 Motorola, Inc. Radio communication device with movable housing element control
JPH0926832A (en) 1995-07-07 1997-01-28 Seiko Epson Corp Information processing device and method
GB9517943D0 (en) * 1995-09-02 1995-11-01 At & T Corp Radio communication device and method
JP3179054B2 (en) 1997-08-29 2001-06-25 富士通株式会社 Data processing apparatus and a clock switching method
JPH1185723A (en) 1997-09-12 1999-03-30 Hitachi Ltd Microcomputer and moving body communication equipment
JPH11205168A (en) 1998-01-07 1999-07-30 Nec Corp Information processor having ratio communication function and operating clock control method
JP3575300B2 (en) 1998-11-12 2004-10-13 トヨタ自動車株式会社 Moving object computer
JP2000261852A (en) 1999-03-04 2000-09-22 Nec Corp Cdma mobile communication terminal
US6799279B1 (en) 2000-06-21 2004-09-28 Matsushita Electric Industrial Co., Ltd. Method and apparatus for stopping supply of power to a specific function for playing contents stored on media in response to a low battery level
JP2002084574A (en) 2000-09-07 2002-03-22 Alps Electric Co Ltd Portable telephone
JP2002207530A (en) 2001-01-10 2002-07-26 Sony Corp Clock supply circuit
JP4363205B2 (en) * 2004-02-05 2009-11-11 株式会社日立製作所 The mobile terminal device
US6995716B2 (en) * 2004-04-30 2006-02-07 Sony Ericsson Mobile Communications Ab Selectively engaged antenna matching for a mobile terminal

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6484041B1 (en) * 1998-10-07 2002-11-19 Nokia Mobile Phones, Ltd. Method for adjusting power consumption
US20020029352A1 (en) * 1998-12-30 2002-03-07 Shekhar Y. Borkar Software control of transistor body bias in controlling chip parameters
US20020040442A1 (en) * 2000-10-02 2002-04-04 Nobutaka Ishidera Software processing apparatus and recording medium on which program is recorded
US20020173344A1 (en) * 2001-03-16 2002-11-21 Cupps Bryan T. Novel personal electronics device

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1575178A3 (en) * 2004-03-12 2005-11-16 Nec Corporation Mobile data terminal and communication method therefor
US20060123260A1 (en) * 2004-03-12 2006-06-08 Nec Corporation Mobile data terminal and communication method therefor
US7296742B2 (en) * 2004-06-29 2007-11-20 Felica Networks, Inc. Data processing apparatus, data processing method, and portable communication terminal apparatus
US20050284940A1 (en) * 2004-06-29 2005-12-29 Felica Networks, Inc. Data processing apparatus, data processing method, and portable communication terminal apparatus
KR101163812B1 (en) * 2006-02-02 2012-07-09 엘지전자 주식회사 Apparatus and method of controlling to economize power in portable computer
US20070180282A1 (en) * 2006-02-02 2007-08-02 Lg Electronics Inc. Power-saving control apparatus and method for a portable computer
US20080076485A1 (en) * 2006-09-27 2008-03-27 Hoo-Sung Lee Method for controlling low-power state in mobile handset
EP1906541A2 (en) * 2006-09-27 2008-04-02 Electronics and Telecommunications Research Institute Method for controlling low-power state in mobile handset
EP1906541A3 (en) * 2006-09-27 2014-01-22 Electronics and Telecommunications Research Institute Method for controlling low-power state in mobile handset
US8868138B2 (en) 2006-09-27 2014-10-21 Electronics And Telecommunications Research Institute Method for controlling low-power state in mobile handset
WO2009040329A1 (en) * 2007-09-27 2009-04-02 Telefonaktiebolaget L M Ericsson (Publ) Single multi-mode clock source for wireless devices
US20090088194A1 (en) * 2007-09-27 2009-04-02 Telefonaktiebolaget Lm Ericsson (Publ) Single Multi-Mode Clock Source for Wireless Devices
EP2407793A1 (en) * 2009-06-26 2012-01-18 Panasonic Corporation Electronic part and method of detecting faults therein
EP2407793A4 (en) * 2009-06-26 2014-12-17 Panasonic Corp Electronic part and method of detecting faults therein

Also Published As

Publication number Publication date Type
JP3879565B2 (en) 2007-02-14 grant
JP2003298499A (en) 2003-10-17 application
US7577417B2 (en) 2009-08-18 grant
US20060252393A1 (en) 2006-11-09 application

Similar Documents

Publication Publication Date Title
US6453182B1 (en) Wireless telephone airplane and alarm clock modes
US7159194B2 (en) Orientation dependent functionality of an electronic device
US7123945B2 (en) Task display switching method, portable apparatus and portable communications apparatus
US6553223B1 (en) Virtual device architecture for mobile telephones
US7231531B2 (en) Personal electronics device with a dual core processor
US20020146989A1 (en) Mobile telephone
US20040204140A1 (en) Mobile terminal apparatus, and power control method and storage medium recording program therefor
US6831444B2 (en) External storage device, and remaining battery amount notifying method in the same
US20040077381A1 (en) Mobile digital communication/computing device having variable and soft landing scrolling
US20060281448A1 (en) Multiple keyboard context sensitivity for application usage
US6976180B2 (en) Personal electronics device
US20030008686A1 (en) Menu displaying method in a mobile terminal
US6868283B1 (en) Technique allowing a status bar user response on a portable device graphic user interface
US20020173344A1 (en) Novel personal electronics device
US7522941B2 (en) Method and apparatus for reducing standby power consumption of a handheld communication system
US20070099574A1 (en) Electronic Device Capable of Operating According to Detection of Environmental Light
EP1453286A1 (en) MOBILE COMMUNICATION TERMINAL, METHOD FOR CONTROLLING EXECUTION STATE OF APPLICATION PROGRAM, APPLICATION PROGRAM, AND RECORDING MEDIUM WHEREIN APPLICATION PROGRAM HAS BEEN RECORDED
US20030013477A1 (en) Controlling dual processors in cellular telephones
US6484041B1 (en) Method for adjusting power consumption
US20020026596A1 (en) Circuit and method of generating process clock for low power consumption CDMA modem chip design
US20040034805A1 (en) Circuit and operating method for integrated interface of pda and wireless communication system
US20040157642A1 (en) Integrated mobile terminal device and method for controlling external display unit
US6542726B2 (en) Personal data assistant terminal with radio
JP2001352395A (en) Mobile terminal
CN1901563A (en) Multifunctional shortcut key setting device and method, and mobile terminal with the same

Legal Events

Date Code Title Description
AS Assignment

Owner name: HITACHI, LTD., JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:ITO, TAMOTSU;IKUTA, KATSUKI;KURODA, MASAYOSHI;AND OTHERS;REEL/FRAME:013931/0749;SIGNING DATES FROM 20030327 TO 20030328