Mobile terminal

• US 20040204022A1
• Filed: 04/03/2003
• Published: 10/14/2004
• Est. Priority Date: 04/03/2002
• Status: Abandoned Application

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Kuroda, Masayoshi, Hasegawa, Tsukasa, Ikuta, Katsuki, Ito, Tamotsu
• Application Number:
  US10/405,368
• Publication Number:
  US 20040204022A1
• Time in Patent Office: Days
• US Class Current: 455/550.1
• CPC Class Codes: H04B 1/40 Circuits
• CPC Class Codes: H04M 1/725 Cordless telephones user interfaces specially adapted therefor H04M1/724
• CPC Class Codes: H04W 52/029 reducing the clock frequency of the controller
• CPC Class Codes: Y02D 30/70 in wireless communication networks

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.

Claims

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. 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. 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. 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. 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. 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. 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. 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. 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. 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.