KR100585794B1 - A method and a apparatus of supplying clock signal for multimedia mobile phone - Google Patents

Abstract

The present invention is to provide a separate clock signal to the high-frequency radio unit and the image signal processing unit of the portable terminal to prevent degradation of reception sensitivity, and processing a video signal without rejection, the main clock for transmitting and receiving mobile signal wireless signal of the portable terminal An oscillator for generating and outputting a signal; A high frequency unit which tunes to a mobile communication transmission / reception channel and transmits / receives a radio signal according to a main clock signal applied from an oscillator; A control unit for monitoring each function unit by a main clock signal applied from an oscillator and controlling a separate sleep clock signal output for processing an image signal; A sleep crystal unit configured to generate and output a sleep clock signal for processing an image signal under control of a controller; And a video signal unit for processing a video frame signal according to a sleep clock signal applied from the sleep crystal unit. In addition, if it is determined that the operating power is supplied by the controller of the portable terminal, the oscillator is activated. A main process of generating a clock; A supply process of supplying a main clock signal to a high frequency portion and a selected circuit portion and monitoring a video signal portion to determine whether to process a video signal; When the video signal is determined to be processed, the sleep crystal unit activates and controls the sleep signal to supply the sleep clock signal to the video signal, thereby processing the video signal without rejection and having an industrial effect of not disturbing the reception performance of the high frequency unit. have.

Description

Apparatus and method for supplying a clock signal of a mobile terminal {A METHOD AND A APPARATUS OF SUPPLYING CLOCK SIGNAL FOR MULTIMEDIA MOBILE PHONE}

1 is a functional block diagram of a clock signal supply apparatus of a portable terminal according to the prior art;

2 is a flowchart of a clock signal supply method of a portable terminal according to the prior art;

3 is a functional block diagram of a clock signal supply device of a portable terminal according to the present invention;

4 is a flowchart illustrating a clock signal supply method of a portable terminal according to the present invention.

          ** Explanation of symbols on the main parts of the drawing **

100: oscillation unit 110: high frequency unit

120: control unit 130: slip crystal part

140: video signal unit

The present invention relates to a clock (M-CLK) supplied to the camera image signal processing unit of a mobile terminal, and in particular, the high-frequency radio unit and the video signal processing unit to supply a separate clock signal, the sensitivity of mobile communication radio signal reception is reduced The present invention relates to a clock signal supply device and a method of a portable terminal which prevents an error and facilitates frame setting of an image signal.

The mobile terminal for mobile communication (MS: MOBILE STATION) monitors the mobile switching center (MSC) while moving freely in the service area formed by the corresponding base station (RAN: RADIO ACCESS NETWORK) of the registered system. It is a high-tech wireless communication device that communicates instantly with the desired party anytime, anywhere through the communication path established by the control and switching, and moves anywhere while the person directly carries it.

The portable terminal has a problem that the time used for direct communication is relatively small and is always carried for the communication which may occur at any time, so that the utilization rate and utilization rate are very low, and various additional services or additional functions may be improved. (Hereinafter additional service).

The additional service, which is developed and provided by a mobile terminal manufacturer, includes a camera, a Bluetooth, a wireless LAN, a radio, a game, an electronic calculator, a calendar, a clock, a call ring setting, and is developed and provided by a mobile communication service provider. One includes text messages, video messages, online games, wireless Internet access, caller identification, and the like, and the additional services are constantly being developed and added.

The additional service function as described above should not affect the mobile communication function, which is a basic function of the portable terminal, and the portable terminal is configured to operate as a digital circuit, and the digital circuit must be supplied with a clock signal for operation.

The portable terminal includes a clock unit (VC-TCXO) for generating a clock signal, supplies the corresponding clock signal to the mobile communication function unit and the additional service function unit, and performs video communication with the counterpart using the camera function unit. Processes and transmits a video signal of about 15 frames per second.

However, there is a problem that a signal generated while processing a video signal photographed by the camera function unit of the portable terminal is induced or induced in the mobile communication radio unit and affects the reception function of the radio signal by mobile communication. Since the clock signal generated by the clock unit VC-TCXO generates a clock signal for mobile communication, there is a problem that it is insufficient to process an image signal.

Accordingly, there is a need to develop a technology that is suitable for video signal processing by a clock signal generated by the mobile terminal MS and does not affect mobile communication radio signal reception by video signal processing.

Below. A clock signal generation method of a portable terminal according to the prior art will be described with reference to the accompanying drawings.

1 is a functional block diagram of a clock signal supply device of a portable terminal according to the prior art, and FIG. 2 is a flowchart of a clock signal supply method of a portable terminal according to the prior art.

Referring to FIG. 1, a clock signal supply apparatus for a portable terminal according to the prior art will be described. The portable terminal is configured to provide a 19.2 MHz main clock signal (MA-CLK) signal required for driving a mobile high frequency unit. It is supplied from a clock signal which is oscillated and outputted from the oscillator (VC-TCXO) 10.

The 19.2 MHz main clock signal (M-CLK) generated by the voltage control from the oscillator (VC-TCXO) 10, including the high frequency unit 20, controls and monitors and operates all functions of the mobile terminal. The control unit 30 and the image signal photographed and input are supplied to the image signal unit 40 which processes and outputs the frame signal.

Since the high frequency unit 20 of the portable terminal needs a clock frequency signal of 19.2 MHz in order to wirelessly transmit and receive a mobile communication signal, the oscillator 10 is standardized to supply a main clock signal of 19.2 MHz. All additional function units or additional service units added to use the 19.2 MHz main clock signal.

The high frequency unit 20 of the mobile terminal, because of the operating characteristics of the mobile communication system, the allocated transmission and reception channel is changed from time to time, and the oscillation unit 10 is a main clock frequency signal to be stablely tuned to the assigned channel. Supply must be stable.

In particular, since a stable main clock (M-CLK) frequency signal must be generated from a change in the use environment of the mobile terminal, for example, a temperature change, a humidity change, an impact, etc., the required 19.2 MHz frequency is accurately generated and outputted. The corresponding additional function unit also receives and uses the 19.2 MHz main clock signal.

The image signal unit 40 processes and outputs an image signal IMAGE SIGNAL to be photographed and input into a frame according to a predetermined standard, and is also called an image processor. In the case of a video, 13 frames per second It is necessary to deal with the above to provide a smooth video signal.

Since the video signal itself has a very large amount of data and must process at least 13 frames per second, a clock signal of a relatively high frequency is required.

However, since the video signal unit 40 receives the main clock signal of 19.2 MHz from the oscillator 10, the video signal unit 40 cannot process the video signal of 13 frames per second. As a result, there is a problem of discontinuity in which the connection of the video signal is not smooth.

In addition, the video signal unit 40 uses a 19.2 MHz main clock (M-CLK) frequency signal supplied directly from the oscillator 10, and may generate a higher clock frequency in the video signal processing. The frequency signal generated while the image signal unit is operating has a problem of being induced or induced by the high frequency unit to impair the mobile communication signal reception function of the high frequency unit.

That is, in the state in which the image signal unit 40 is operating, there is a problem of occurrence of high frequency performance failure such as the radio signal reception sensitivity of the high frequency unit 20 is poor.

In order to solve some of the problems described above, a method of multiplying the 19.2 MHz main clock signal applied from the oscillator 10 may be used, but the circuit configuration becomes complicated, the volume and weight are increased, and the price is high. The problem still remains.

Hereinafter, a clock signal supply method of a portable terminal according to the prior art will be described with reference to FIG. 2.

The controller 30 of the mobile communication terminal MS controls the oscillator VC-TCXO (VOLTAGE CONTROLLED TEMPERATURE COMPENSATION CRYSTAL OSCILLATOR) when the operating power is first supplied (S10), and the main clock (M-) of 19.2 MHz is controlled. CLK) signal (S20), and the generated 19.2 MHz main clock (M-CLK) signal including the control unit 30, the high frequency unit 20, the image signal unit 40, each function of the mobile terminal Supply to the unit (S30).

The frequency of 19.2 MHz supplied by the oscillator 10 of the portable terminal is a frequency necessary for the high frequency unit 20 to be accurately tuned to a channel that is frequently changed by mobile communication characteristics, and is a frequency outputted by a change in ambient usage environment. In order to minimize the change, it is equipped with its own temperature compensation device, thereby ensuring the stability (STABILITY).

However, the 19.2 MHz main clock (M-CLK) signal output by the oscillator 10 is not suitable for dynamic processing of the video signal.

The present invention provides a clock signal supply apparatus and method for a mobile terminal for processing a video signal without affecting the reception of a high frequency signal because a sleep crystal signal is added to the mobile terminal to generate a sleep clock signal suitable for video signal processing. The purpose is to.

In order to achieve the above object, the present invention includes an oscillator for generating and outputting a main clock signal for transmitting and receiving a mobile communication wireless signal of a mobile terminal; A high frequency unit which tunes to a mobile communication transmission / reception channel and transmits and receives a radio signal according to a main clock signal applied from the oscillator; A control unit for monitoring each function unit by a main clock signal applied from the oscillator and controlling a separate sleep clock signal output for processing an image signal; A sleep crystal unit for generating and outputting a sleep clock signal for processing an image signal under the control of the controller; The video signal unit may process a video frame signal by a sleep clock signal applied from the sleep crystal unit.

In addition, the present invention devised to achieve the above object, the main process of generating a main clock by activating the oscillator when it is determined that the operating power is supplied by the controller of the portable terminal; Supplying a main clock signal generated in the process to a high frequency unit and a selected circuit unit and determining whether to process a moving image signal by monitoring the image signal unit; When it is determined that the video signal is processed in the above process, the sleep crystal unit is activated to control the sleep signal.

Hereinafter, the present invention will be described with reference to the accompanying drawings a clock signal supply apparatus and method of a portable terminal.

3 is a functional block diagram of a clock signal supply apparatus of a portable terminal according to the present invention, and FIG. 4 is a flowchart of a clock signal supply method of a portable terminal according to the present invention.

Referring to FIG. 3, the apparatus for supplying a clock signal of a mobile terminal according to the present invention is to generate and output a main clock (M-CLK) signal for transmitting / receiving a mobile communication wireless signal of a mobile terminal for mobile communication. Voltage control (VC: VOLTAGE CONTROLLED) to quickly and accurately tune to the assigned mobile communication transmission and reception channel (CH), and temperature compensation (TC: TEMPERATURE COMPENSATION) for the stability of the frequency generated from the ambient temperature change An oscillator (VC-TCXO) 100 for outputting a 19.2 MHz clock frequency signal as a main clock (M-CLK) frequency signal;

A high frequency unit 110 that tunes to a mobile communication transmission / reception channel and transmits and receives a corresponding wireless signal by a main clock (M-CLK) signal applied from the oscillator 100;

Each function unit is monitored by a main clock (M-CLK) signal applied from the oscillator 100, and a separate sleep clock (SLEEP-CLK) signal output is controlled for processing an image signal, and is applied from the oscillator 100. The control unit operates by a main clock (M-CLK) signal, and controls and monitors the sleep clock signal generated by controlling the sleep crystal unit 130 to be applied to the video signal unit 140 when processing a video signal. 120,

The control unit 120 generates and outputs a sleep clock (SLEEP-CLK) signal for processing image signals, and generates and outputs a sleep clock (SLEEP-CLK) signal having a 25.4 MHz frequency without supplying operating power. Crystal part 130,

The video frame signal is processed by the sleep clock signal SLEEP-CLK signal applied from the sleep crystal part 130, and under the control of the controller 120, 25.4 MHz is applied from the sleep crystal part 130. The video signal unit 140 is configured to process an image signal of 15 frames per second by the sleep clock signal.

Hereinafter, the present invention having the above-described configuration will be described in detail with reference to the accompanying drawings.

The mobile communication terminal (MS) is a basic function is to communicate freely moving in the formed service area, the mobile communication, due to the operating characteristics, it is necessary to frequently and quickly change the channel assigned to the communication, as described above A frequency that is supplied stably and accurately for channel setting and change is required, and the oscillator (VC-TCXO) 100 functions as this.

That is, the oscillator 100 oscillates a main clock frequency signal necessary for basic operation of the mobile terminal MS, and performs voltage control (VC) for fast and accurate channel change, and is stable. In order to output the frequency, a 19.2 MHz clock frequency signal, which is temperature compensated (TC) and determined by the standard, is output as the main clock (M-CLK) signal.

The oscillator 100 is activated by the control of the controller 120 and controls the output of the main clock (M-CLK) signal. The main clock signal includes a high frequency unit 110 and a controller 120. Is applied as the base clock to other additional functions.

The controller 120 activates the oscillator 100 when the operating power is first applied to the portable terminal to generate and output a main clock signal of 19.2 MHz, which is used by the controller 120 itself, and at the same time, the high frequency unit 110. And apply to the additional function.

When the video is captured and transmitted to the other party by using the camera function integrally provided by the mobile terminal MS by the monitoring of the controller 120, the video signal must be processed and transmitted at least 13 frames per second. In this case, the receiving counterpart can view the video without rejection, and in general, the video signal of 15 frames is transmitted in consideration of an error or the like.

In order to capture a video signal of 13 frames or more in the mobile terminal MS, since a higher clock frequency is required, the controller 120 activates the sleep crystal part (SLEEP X-TAL) 130.

When the video signal is photographed as described above, the sleep crystal unit 130 activated by the control of the controller 120 generates and outputs a sleep clock (SLEEP-CLK) signal of 25.4 MHz without supplying power. The sleep clock signal output together is applied to the image signal unit 140.

The video signal unit 140 processes more than 13 frames (FRAME) or 15 frames (FRAME) of the video signal by the sleep clock signal applied from the sleep crystal unit 130 at a high frequency of 25.4 MHz in units of seconds. Therefore, a video signal without rejection is output.

The sleep crystal unit 130 to which the image signal unit 140 receives a sleep clock signal and the oscillation unit 100 to which the high frequency unit 110 receives a main clock signal M-CLK The circuit is separated.

That is, since the harmonic signal generated while the video signal unit 140 processes the video signal having a large amount of data is not directly induced or induced by the high frequency unit 110, the high frequency unit 110 is not affected by noise. Has the advantage of not being disturbed in receiving the mobile communication signal.

Hereinafter, a clock signal supply method of a portable terminal according to the present invention will be described with reference to FIG.

When it is determined that the operating power is supplied by the controller of the mobile communication terminal, the oscillator 100 is activated to generate a main clock (M-CLK), and the normal operating power is supplied by the portable terminal controller 120. Determining whether it is (S100); If it is determined that the operating power is supplied in the step (S100), the main step consisting of activating the oscillator 100 to generate a main clock (M-CLK) signal of 19.2 MHz (S110),

The main clock signal generated in the main process is supplied to the high frequency unit 110 and the selected circuit unit, and the image signal unit 40 is monitored to determine whether to process a video signal. The main clock (M-CLK) signal is transmitted to the high frequency unit. Supplying to the circuit unit 110 and the selected unit (S120); The control unit 120 of the process (S120) is a supply process consisting of the process of determining whether to process the video signal by monitoring the video signal unit 140 (S130),

If it is determined that the video signal is processed in the supply process (S130), the sleep crystal unit 130 is activated to supply the sleep clock signal to the video signal unit, and the video process is processed in the supply process (S130). If it is determined, the step of generating a sleep clock (SLEEP-CLK) signal of 25.4 MHz by activating and controlling the sleep crystal unit (SLEEP X-TAL) (130) (S140); A sleep process includes a process (S150) of supplying a sleep clock signal (SLEEP-CLK) signal generated in the process (S140) to the image signal unit 140.

Hereinafter, a method of supplying a clock signal of a portable terminal according to the present invention having the above configuration will be described in detail with reference to the accompanying drawings.

If it is determined that the operating power is supplied (S100), the controller 120 of the mobile communication terminal for mobile communication activates and controls the oscillator 100 to generate a 19.2 MHz main clock (M-CLK) signal (S110). The main clock signal of 19.2 MHz generated in step S110 is supplied to the high frequency unit 110 including the control unit 120 and the selected circuit function (S120).

If it is determined that the controller 120 monitors the image signal unit 140 to process a video signal, the controller 120 activates and controls the sleep crystal unit 130 to generate a sleep clock signal of 25.4 MHz. And a 25.4 MHz sleep clock signal generated or output from the sleep crystal unit 130 in step S140 to the video signal unit 140, thereby providing a video signal of 15 frames or more in seconds. Process (S150).

Therefore, the above configuration does not use a separate multiplying device or expensive and bulky video signal unit 140, and the video signal of 15 frames per second in the state using the general video signal unit 140 And a 25.4 MHz sleep clock signal output from the sleep crystal unit 130 separated from the oscillator 100, the signal of the image signal unit 140 is induced or induced by the high frequency unit 110 to generate noise. There is an advantage that does not affect.

The present invention having the above configuration has an industrial use effect of processing a video signal without rejection while using a general video signal unit instead of an expensive and bulky video signal unit in a portable terminal.

In addition, since a general video signal unit is used, the cost of the portable terminal can be reduced, and the volume can be reduced, thereby improving reliability.                     

In addition, since the clock signal source of the video signal part and the clock signal source of the high frequency part are configured differently, since the harmonic signals of the video signal part are induced or induced in the high frequency part and do not affect noise, the industrial use effect does not impair the reception performance of the high frequency part. There is.

Claims (9)

An oscillator for generating and outputting a main clock signal for transmitting / receiving a mobile communication wireless signal of a mobile terminal; A high frequency unit which tunes to a mobile communication transmission / reception channel and transmits and receives a radio signal according to a main clock signal applied from the oscillator; A control unit for monitoring each functional unit by a main clock signal applied from the oscillator and controlling a separate sleep clock signal output for processing an image signal; A sleep crystal unit for generating and outputting a sleep clock signal for processing a video signal under the control of the controller; And a video signal unit for processing a video frame signal by a sleep clock signal applied from the sleep crystal unit. The method of claim 1, wherein the oscillator, The high frequency unit is a voltage control to quickly and accurately tune to the assigned mobile communication transmission and reception channels, temperature compensation for the stability of the frequency generated from the ambient temperature changes, and outputs a clock frequency signal of 19.2 MHz as the main clock frequency signal Clock signal supply device of a portable terminal, characterized in that made. The method of claim 1, wherein the slip crystal portion, And a sleep clock signal having a frequency of 25.4 MHz without a supply of operating power under the control of the control unit. The method of claim 1, wherein the control unit, The mobile terminal is operated by a main clock signal applied from the oscillator, and when processing a video signal, the mobile terminal is configured to control and monitor a sleep clock signal generated by controlling the sleep crystal unit to be applied to the video signal unit. Clock signal supply. The method of claim 1, wherein the video signal unit, And a video signal of 15 frames per second by a sleep clock signal of 25.4 MHz applied from a sleep crystal unit under the control of the control unit. A main process of generating a main clock by activating the oscillator if it is determined that the operating power is supplied by the controller of the portable terminal; A supply process of supplying a main clock signal generated in the process to a high frequency unit and a selected circuit unit and monitoring a video signal unit to determine whether to process a video signal; And a sleep process of supplying a sleep clock signal to the video signal by controlling activation of the sleep crystal unit if it is determined that the video signal is processed in the process. The method of claim 6, wherein the main process, Determining whether normal operating power is supplied by the portable terminal controller; If it is determined that the operating power is supplied in the process, the clock signal supply method of a mobile terminal, characterized in that the step of activating the oscillator to generate a main clock signal of 19.2 MHz. The method of claim 6, wherein the supply process, Supplying a main clock signal generated in the main process to a high frequency part and a selected circuit part; The control unit of the process comprises the step of monitoring the video signal to determine whether to process a video signal, the clock signal supply method of a mobile terminal. The method of claim 6, wherein the slip process, If it is determined that the video signal is processed in the supplying process, activating and controlling the sleep crystal unit to generate a sleep clock signal of 25.4 MHz; And supplying the sleep clock signal generated in the process to the image signal unit.

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