JP2001186488A - Mobile communication terminal equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve quality in an image pickup signal by preventing the adverse effect of the electromagnetic noise of a radio exchange signal on the image pickup signal which is outputted from a camera. SOLUTION: An exchange period deciding means 21a respectively detects a transmission channel CH2 period and a reception channel CH3 period in a main control part 21 during TV telephone communication and a camera output stop control means 21b gives a control signal SC for stopping the output of the image pickup signal in the camera 33 to the camera 33 in the respective detection periods. Then the output of the image pickup signal from the camera 33 is stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile communication terminal such as a portable telephone terminal or a portable information terminal, and more particularly to a mobile communication terminal provided with a camera, a display, and a backlight for illuminating operation keys.

[0002]

2. Description of the Related Art In recent years, as one of mobile communication terminals such as a portable telephone terminal and a PHS terminal, a terminal device having a television telephone communication function has been developed. This type of device is called, for example, a Visual Phone,
The video signal captured by the camera is encoded and transmitted together with the audio signal to the communication partner. On the other hand, the video signal and the audio signal received from the communication partner are decoded and reproduced, and the video signal is displayed on the display and the audio signal is displayed. It is configured to output from a speaker.

[0003]

However, in this type of mobile communication terminal device, generally, when video telephone communication is started, a camera is always operated, and a video signal output from this camera is processed as it is by image signal processing. It is configured to input the data to a unit, perform encoding and compression processing, etc., and then provide the data to transmission. For this reason, the video signal may be affected by electromagnetic wave noise generated by a transmission / reception operation of a radio frequency signal, particularly, a transmission operation with a large power level, thereby causing deterioration of video quality.

[0004] In a mobile communication terminal device equipped with a camera, intermittent operation of the camera by periodically turning off power supply to the camera has been considered in order to save power. However, in a small mobile communication terminal device such as a mobile phone device, since the camera is close to the antenna and the wireless unit, noise generated by a sudden change in the driving current when the power of the camera is turned on and off is generated by the antenna. The signal may be input to the radio unit via the channel and mixed with the transmission / reception signal. This phenomenon may also occur when an illuminator that illuminates the display and the operation keys is turned on and off at night or the like.

[0005] Further, generally, a mobile communication terminal device is provided with a display for displaying the operating state of the device and received information. However, in a small mobile communication terminal device, since this display is close to the antenna and the radio section, electromagnetic noise due to radio transmission / reception radio waves, especially transmission radio waves having a high power level, is superimposed on the display signal, resulting in display quality. May be deteriorated.

The present invention has been made in view of the above circumstances, and an object thereof is to prevent a camera or an illuminator from being adversely affected by radio transmission / reception signals, thereby improving signal quality. It is an object of the present invention to provide a mobile communication terminal device.

[0007]

According to a first aspect of the present invention, there is provided a camera for picking up an image of a subject, and a predetermined signal processing performed on an image pickup signal output from the camera for transmission. In a mobile communication terminal device including an image signal processing unit and a wireless unit that performs transmission and reception of wireless signals in a time-division manner, a detection unit that detects at least one of a transmission period and a reception period of a wireless signal by the wireless unit, Signal supply stopping means for stopping supply of the image pickup signal to the image signal processing unit in at least one of a transmission period and a reception period according to a detection result of the detection means. It is like that.

Therefore, according to the first aspect, the image signal output from the camera is not taken into the image signal processing section during at least one of the transmission period and the reception period. For this reason, a problem that the video data affected by the electromagnetic wave noise caused by the transmission radio wave or the reception radio wave is transmitted or displayed is prevented, and thereby the quality of the video data can be improved.

According to a second aspect of the present invention, there is provided a mobile communication terminal device including a camera for capturing an image of a subject and a wireless unit for transmitting and receiving wireless signals in a time-division manner. Detecting means for detecting at least one of the transmission period and the reception period of the radio signal; and a power-on / off operation prohibition means. The prohibition means detects the transmission period and the reception period according to the detection result of the detection means. In at least one of the periods, the power on / off operation of the camera is prohibited.

Therefore, according to the second aspect, the power on / off operation of the camera is prohibited during at least one of the transmission period and the reception period. Therefore, for example, even when the camera is intermittently operated for battery saving, the power on / off operation of the camera is not performed during the transmission period or the reception period,
Thus, there is no fear that noise generated at the time of turning on / off the power of the camera adversely affects the transmission / reception signal. That is, it is possible to always maintain high quality of the transmission / reception signal by eliminating the influence of the intermittent operation of the camera.

According to a third aspect of the present invention, there is provided a mobile communication terminal including an illuminator for illuminating at least one of a display and an operation key, and a radio unit for transmitting and receiving radio signals in a time-division manner. The apparatus further includes a detection unit that detects at least one of a transmission period and a reception period of the wireless signal by the wireless unit, and a prohibition unit that prohibits the lighting and extinguishing operations of the illuminator. According to the detection result, the turning on and off operations of the illuminator are prohibited during at least one of the transmission period and the reception period.

Therefore, according to the third aspect, during at least one of the transmission period and the reception period, the lighting and extinguishing operations of the illuminator are prohibited, so that noise generated when the illuminator is turned on and off is reduced. There is no need to worry about adverse effects on transmission and reception signals. That is, it is possible to always maintain high quality of the transmission / reception signal by eliminating the influence of the lighting / light-off operation of the illuminator.

According to a fourth aspect of the present invention, a display unit, a display control unit for supplying a display signal to the display unit to display display information, and transmitting and receiving wireless signals in a time division manner. In a mobile communication terminal device having a radio unit, a detection unit that detects at least one of a transmission period and a reception period of a radio signal by the radio unit, and a supply stop unit of a display signal are provided. The supply of the display signal to the display unit is stopped during at least one of the transmission period and the reception period according to the detection result of the detection unit.

Therefore, according to the fourth aspect, the supply of the display signal to the display unit is stopped during at least one of the transmission period and the reception period. For this reason, a problem in which a display signal affected by electromagnetic wave noise due to a transmission radio wave or a reception radio wave is displayed on the display unit is prevented, and thus, high display quality can be maintained.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) A first embodiment of a mobile communication terminal device according to the present invention detects a transmission channel period and a reception channel period during video telephone communication, respectively. During these periods, the output of the imaging signal from the camera is stopped, so that the video data affected by the electromagnetic wave noise due to the transmission radio wave and the reception radio wave is not transmitted or displayed.

FIG. 1 is a front view showing the appearance of a PHS terminal which is a first embodiment of the mobile communication terminal device according to the present invention. The front panel of the device has a liquid crystal display (LC
D) 34, dial keys 35a and various function keys 35
A key input unit 35 made of b is provided, and a speaker 32 as a receiver and a microphone 31 as a transmitter are provided at the upper end and the lower end of the front panel, respectively. The antenna 11 and the camera 33 are provided at the upper end of the device.
Is installed.

FIG. 2 is a block diagram showing a circuit configuration of the PHS terminal. This PHS terminal has a radio unit 1
, A baseband unit 2, an input / output unit 3, and a power supply unit 4.

A radio frequency signal arriving from a base station (not shown) via a radio channel is received by an antenna 11 and then input to a receiving circuit (RX) 13 via an antenna duplexer (DUP) 12. The receiving circuit 13 includes a high-frequency amplifier, a frequency converter, and a demodulator. Then, the radio signal is low-noise amplified by a low-noise amplifier, and then mixed with a reception local oscillation signal generated by a frequency synthesizer (SYN) 14 in a frequency converter and frequency-converted into a reception intermediate frequency signal or reception baseband signal. Then, the output signal is digitally demodulated by a demodulator. As the demodulation method, for example, a quadrature demodulation method compatible with the QPSK method is used. The frequency of the reception local oscillation signal generated from the frequency synthesizer 14 is
Is instructed from the main control unit 21 provided in the control unit.

The demodulated signal output from the demodulator is input to the baseband unit 2. The baseband unit 2 includes a main control unit 21, a demultiplexing unit 22, an audio codec (hereinafter referred to as an audio codec) 23, a multimedia processing unit 24, and an LCD control unit 25.

The demodulated signal is identified by the main control section 21 as control information or multimedia information. If the demodulated signal is multimedia information, the demodulated signal is supplied to a demultiplexing section 22 where audio data and image data are separated. Is separated into
Then, the audio data is supplied to the audio codec 23, where the audio is decoded, and the audio signal reproduced thereby is output from the speaker 32 of the input / output unit 3 as a loudspeaker. On the other hand, the video data is supplied to the multimedia processing unit 24, where the video data is decoded, and the reproduced video signal is transmitted to the LCD of the input / output unit 3 via the LCD control unit 25.
It is supplied to 34 and displayed.

The received video data is stored in the RAM in the main control unit 21 as needed. Also LCD
In the display 34, various information indicating the operation state of the own device output from the main control unit 21, such as a telephone directory, a received electric field strength detection value, and a remaining battery level, are also displayed.

On the other hand, the transmission voice signal of the user output from the microphone 31 of the input / output unit 3 is transmitted to the baseband unit 2.
Is input to the demultiplexer 22 after being subjected to voice coding. In addition, camera (C
The video signal output from the AM 33 is input to the multimedia processing unit 24 of the baseband unit 2, where the video signal is subjected to video encoding processing, and then input to the demultiplexing unit 22. In the demultiplexer 22, the encoded audio data and video data are multiplexed in a predetermined format,
The multiplexed transmission data is input from the main control unit 21 to the transmission circuit (TX) 15 of the wireless unit 1.

The transmission circuit 15 includes a modulator, a frequency converter, and a transmission power amplifier. The transmission data is digitally modulated by a modulator, and then mixed with a transmission local oscillation signal generated by a frequency synthesizer 14 by a frequency converter and frequency-converted into a radio frequency signal. As a modulation method, a QPSK method is used. And
The generated transmission radio frequency signal is amplified to a predetermined transmission level by a transmission power amplifier, and then transmitted to the antenna duplexer 1.
2 to the antenna 11, and the antenna 11
Is transmitted to a base station (not shown).

The power supply section 4 is provided with a battery 41 such as a lithium ion battery, a charging circuit 42 for charging the battery 41, and a voltage generation circuit (PS) 43. The voltage generation circuit 43 includes, for example, a DC / DC converter, and generates a predetermined power supply voltage Vcc based on the output voltage of the battery 41.

The main control unit 21 includes a microprocessor, a ROM, and a RAM. The main control unit 21 is related to the present invention in addition to the usual control functions such as wireless channel connection control and communication control after establishing a communication link. As a control function, a transmission / reception period determination unit 21a and a camera output stop control unit 21b are newly provided.

In the PHS, as shown in FIG. 3 (a), TDMA-TDD in which four transmission channels and four reception channels are time-division multiplexed and bidirectionally transmitted on the same frequency.
(TimeDivision Multiple Access-Time Division Dup
lex) system. Then, each PHS terminal performs wireless communication using one set of transmission / reception channels that are idle among the four sets of transmission / reception channels. For example, if the transmission channel CH2 and the reception channel CH3 are free as shown in FIG. 3B, the wireless communication is performed using these.

The transmission / reception period determination means 21a detects the transmission channel period and the reception channel period during the communication of the terminal. For example, in the case of FIG. 3B, each period of the transmission channel CH2 and the reception channel CH3 is detected.

The camera output stop control means 21b outputs an operation stop signal SC to the camera 33 to stop the output of the image signal in the transmission period and the reception period detected by the transmission / reception period determination means 21a. Instead of stopping the output of the imaging signal from the camera 33, it is also possible to control the multimedia processing unit 24 by the operation stop signal SC to stop the capture of the imaging signal output from the camera 33. .

Next, the operation of the apparatus configured as described above will be described. It is assumed that the user uses the key input unit 35 to perform a calling operation for performing videophone communication with a desired partner terminal. Then, in the PHS terminal, the main controller 21 first executes a connection process for establishing a communication link with the partner terminal. Then, in this connection processing, for example, the transmission channel CH2 and the reception channel CH3 are allocated from the base station, and when a communication link is established between the base station and the communication partner terminal, the television telephone communication is started.

That is, the transmitted voice of the user input to the microphone 31 is voice-coded by the voice codec 23, while the user's face video or peripheral video captured by the camera 33 is video-coded by the multimedia processing unit 24. And input to the demultiplexer 22. The data is multiplexed by the demultiplexer 22 according to a predetermined format, and the multiplexed transmission data is supplied from the main controller 21 to the transmission circuit 15, which modulates the data, upconverts the signal into a radio frequency signal, and transmits the signal. After radio signal processing such as power amplification is performed, burst transmission is performed from the antenna 11 to a base station (not shown) during the transmission channel CH2.

On the other hand, the radio frequency signal arriving from the base station during the receiving channel CH3 is received by the antenna 11 and then input to the receiving circuit 13, where it is down-converted into an intermediate frequency signal or a baseband signal, and After the demodulation processing is performed, it is input to the baseband unit 2.
The demodulated data is separated into audio data and video data by the demultiplexer 22, and the audio data is subjected to audio decoding processing by the audio codec 23 and then to the speaker 32.
From the speaker. The video data is subjected to video decoding processing by the multimedia processing unit 24, and then the LCD control unit 2
5 to the LCD 34 for display.

By the way, during this television telephone communication, the main control section 21 monitors each period of the transmission channel CH2 and the reception channel CH3 by the transmission / reception period determination means 21a. Then, in accordance with the monitoring result, the control signal SC for stopping the output of the imaging signal from the camera 33 is given to the camera 33 during each of the transmission channel CH2 and the reception channel CH3. Therefore, the camera 33
As shown in FIG. 4, in each period of the transmission channel CH2 and the reception channel CH3, the output of the own imaging signal is stopped.

Accordingly, it is possible to prevent the electromagnetic wave noise caused by the transmission wave of the terminal itself transmitted from the antenna 11 and the reception wave from the base station received by the antenna 11 from being mixed into the image pickup signal. Unaffected high-quality video data is transmitted to the communication partner terminal.

As described above, in the first embodiment, the main control unit 21 detects the transmission channel CH2 period and the reception channel CH3 period during the videophone communication, and during these periods, the image signal of the camera 33 is detected. A control signal SC for stopping the output is supplied to the camera 33, whereby the output of the imaging signal from the camera 33 is stopped.

Therefore, in the transmission period and the reception period, the imaging signal output from the camera 33 is not taken into the multimedia processing unit 24. For this reason, a problem in which video data affected by electromagnetic wave noise due to transmission radio waves and reception radio waves is transmitted or displayed on the LCD 34 is prevented, thereby improving the quality of the video data.

(Second Embodiment) A mobile communication terminal according to a second embodiment of the present invention provides a transmission channel during a videophone communication when a camera is operated intermittently for battery saving. Period and the reception channel period, respectively, and prohibits the power on / off operation of the camera during these periods, thereby eliminating the influence of the camera even if the camera is performing the intermittent imaging operation. This prevents noise generated at the time of the on / off operation from affecting the transmission and reception signals.

FIG. 5 shows a PH according to the second embodiment.
It is a circuit block diagram which shows the structure of S terminal. 2, the same parts as those in FIG. 2 are denoted by the same reference numerals, and detailed description is omitted.

The input / output unit 3 is provided with a battery saving circuit 37 attached to the camera 33. The battery saving circuit 37 periodically turns on and off the power supply voltage Vcc supplied to the camera 33 in order to reduce the power consumption during the imaging operation of the camera 33.

The main control unit 21 of the baseband unit 2 includes a transmission / reception period determination unit 21a and a camera power on / off prohibition control unit 21c as its control functions. The transmission / reception period determination unit 21a detects the transmission channel period and the reception channel period during the communication of the own terminal, for example, the respective periods of the transmission channel CH2 and the reception channel CH3.

On the other hand, camera power on / off prohibition control means 2
1c supplies a prohibition signal PC to the battery saving circuit 37 during the transmission channel CH2 period and the reception channel CH3 period detected by the transmission / reception period determination means 21a, thereby saving the battery during the transmission channel CH2 period and the reception channel CH3 period. The ON / OFF operation of the power supply voltage Vcc to the camera 33 by the circuit 37 is prohibited.

With such a configuration, the main control unit 21 performs the transmission / reception period determination means 2 during the television telephone communication.
1a, the transmission channel CH2 and the reception channel CH3
Are detected. Then, the control signal PC for stopping the battery saving operation is given to the battery saving circuit 37 during these detection periods by the camera power on / off inhibition control means 21c. Therefore, the transmission channel CH2 period and the reception channel CH
During the three periods, the battery saving circuit 37 stops the battery saving operation, that is, the on / off operation of the power supply voltage Vcc for the camera 33, as shown in FIG. 6, and keeps the supply of the power supply voltage Vcc stopped.

Therefore, as shown in FIG. 6, for example, as shown in FIG.
The imaging operation is performed in accordance with the battery saving operation in other periods except the H3 period. For this reason,
The power of the camera 33 does not turn on and off during the transmission channel CH2 period and the reception channel CH3 period, whereby noise generated at the time of turning on and off the power of the camera 33 mixes into the transmission / reception signal, particularly the reception signal. In addition, the problem of deteriorating the received signal quality is reliably prevented.

That is, according to the second embodiment, even when the camera 33 is performing the intermittent imaging operation by battery saving, the noise generated at the time of the power on / off operation of the camera 33 is eliminated by eliminating the influence. The transmission and reception signals can be prevented from being adversely affected.

(Third Embodiment) A mobile communication terminal according to a third embodiment of the present invention is provided with an LCD and an illuminator for a key input unit. A period and a reception channel period are respectively detected, and during these detection periods, the lighting and extinguishing operations in the illuminator are prohibited, so that noise generated during the illuminating lighting and extinguishing operations adversely affects the transmission and reception signals. It is not to be.

FIG. 7 shows a PH according to the third embodiment.
It is a circuit block diagram which shows the structure of S terminal. 2, the same parts as those in FIG. 2 are denoted by the same reference numerals, and the detailed description is omitted.

The input / output unit 3 has an LC during operation and communication.
Illuminator 36 for illuminating D34 and key input unit 35
Is provided. This illuminator 36 is called, for example, a backlight or an illumination.

The main control section 21 of the baseband section 2 includes a transmission / reception period determination section 21a and an illumination inhibition control section 21d as its control functions. Among them, the transmission / reception period determination unit 21a detects the transmission channel period and the reception channel period during the communication of the terminal itself, for example, the respective periods of the transmission channel CH2 and the reception channel CH3, as described above.

On the other hand, during the transmission channel CH2 period and the reception channel CH3 period detected by the transmission / reception period determination unit 21a, the illumination prohibition control unit 21d operates.
To the transmission channel C
Illuminator 3 in H2 period and reception channel CH3 period
The turning on and off operations of No. 6 are prohibited.

With such a configuration, for example, during videophone communication, the main control unit 21 detects each period of the transmission channel CH2 and the reception channel CH3 by the transmission / reception period determination unit 21a. Then, a control signal LC for prohibiting the illuminator 36 from turning on / off the illumination during these detection periods by the illumination inhibition control means 21d.
Is given. For this reason, as shown in FIG. 8, for example, even if the user turns on and off the illuminator 36 during the transmission channel CH2 period and the reception channel CH3 period, the illuminator 36 performs the transmission channel CH2 period and the reception operation. Lighting and extinguishing operations are performed avoiding the channel CH3 period.

Therefore, the illuminator 36 does not turn on and off during the transmission channel CH2 period and the reception channel CH3 period, whereby noise generated when the illuminator 36 turns on and off is mixed into the transmission / reception signal, especially the reception signal. As a result, the problem of deteriorating the received signal quality is reliably prevented.

That is, according to the third embodiment, in the PHS terminal provided with the illuminator 36, the illuminator 36
It is possible to prevent noise generated at the time of turning on and off the LED from affecting the transmitted and received signals.

(Fourth Embodiment) A fourth embodiment of the mobile communication terminal device according to the present invention detects a transmission channel period and a reception channel period during communication, respectively, and transmits the data to the LCD during these periods. The supply of the display signal is stopped so that the display data affected by the electromagnetic wave noise caused by the transmission radio wave and the reception radio wave is not displayed on the LCD.

FIG. 9 shows a PH according to the fourth embodiment.
It is a circuit block diagram which shows the structure of S terminal. 2, the same parts as those in FIG. 2 are denoted by the same reference numerals, and the detailed description is omitted.

The main control section 21 of the baseband section 2 includes a transmission / reception period determination section 21a and a display signal supply stop control section 21e as its control functions. Among them, the transmission / reception period determination unit 21a sets the transmission channel period and the reception channel period during the communication of the own terminal as described above,
For example, each period of the transmission channel CH2 and the reception channel CH3 is detected.

On the other hand, display signal supply stop control means 21e
Is an output stop signal M to the LCD control unit 25 during the transmission channel CH2 period and the reception channel CH3 period detected by the transmission / reception period determination unit 21a.
By outputting C, the supply of the display signal to the LCD 34 is stopped.

With such a configuration, during communication, in the main control section 21, each period of the transmission channel CH2 and the reception channel CH3 is detected by the transmission / reception period determination means 21a. Then, the control signal MC for inhibiting the output operation of the display signal is supplied to the LCD control circuit 25 during these detection periods by the display signal supply stop control means 21e. Therefore, during the transmission channel CH2 period and the reception channel CH3 period, the LCD control unit 25 stops supplying the display signal to the LCD 34, for example, as shown in FIG.

Therefore, it is possible to prevent the electromagnetic wave noise caused by the transmission wave of the terminal itself transmitted from the antenna 11 and the reception wave from the base station received by the antenna 11 from being mixed into the display signal. High-quality display data that is not affected can be displayed on the LCD 34. That is, according to the fourth embodiment, high-quality display can be performed while eliminating the influence of electromagnetic wave noise due to transmission radio waves and reception radio waves.

(Fifth Embodiment) In a fifth embodiment of the mobile communication terminal device according to the present invention, each of the above embodiments has a PH which performs wireless communication by the TDMA-TDD system.
While the description has been made by taking the S terminal as an example, the present invention is applied to a mobile communication terminal that performs wireless communication by the CDMA method.

That is, in the CDMA system, the transmission channel and the reception channel are code-division multiplexed by spreading codes, respectively, so that the CDMA terminal always performs transmission and reception operations. For this reason, it is impossible to detect the transmission / reception period as in the case of the TDMA-TDD system and to control the power on / off operation of the camera and the lighting on / off operation of the illuminator during this period.

Therefore, in the case of a CDMA terminal, the importance of transmission data and reception data is monitored for each transmission channel and reception channel. Then, when a period during which transmission data and reception data having a degree of importance equal to or higher than a predetermined level is transmitted and received is detected, the ON / OFF operation of the camera power supply and the ON / OFF operation of the illuminator are prohibited during these periods. FIG. 11 shows an example of the operation, in which the output of the imaging signal from the camera is stopped.

The case where the transmission / reception data is important is, for example, a case where audio data is sound, and a case where video data is video data. In addition, in the case of video data, a DC component, a low frequency component, and control data may be used as important data to detect the period.

With this configuration, in the CDMA terminal, during the transmission and reception of important transmission data and reception data, the ON / OFF operation of the camera power and the ON / OFF operation of the illuminator are prohibited. As a result, it is possible to prevent a problem that the noise generated by the on / off operation of the camera power supply and the turning on / off operation of the illuminator adversely affects the transmission data and the reception data.

(Other Embodiments) The present invention is not limited to the above embodiments. For example, the first
In the fourth embodiment, the output of the imaging signal from the camera 33 and the supply of the display signal to the LCD 34 are stopped in both the transmission channel period and the reception channel period. However, the transmission output has a large effect on the imaging signal and the display signal. For this reason, the control of stopping the output of the imaging signal from the camera 33 and the supply of the display signal to the LCD 34 may be performed only in the transmission channel period.

In each of the second and third embodiments, the ON / OFF operation of the power supply of the camera 33 and the ON / OFF operation of the illuminator 36 are prohibited in both the transmission channel period and the reception channel period. did. However, the noise generated by the ON / OFF operation of the power supply of the camera 33 and the ON / OFF operation of the illuminator 36 affects mainly received data having a small signal level. Therefore,
The control for prohibiting the ON / OFF operation of the power supply of the camera 33 and the ON / OFF operation of the illuminator 36 may be performed only during the reception channel period.

Further, in each of the above-described embodiments, a case has been described as an example where video data composed of a moving image is coded by a multimedia processing unit and then multiplexed with audio data by a demultiplexing unit and transmitted. The present invention can be similarly applied to an apparatus configured to extract still image data from a video signal to be transmitted and temporarily stop transmitting audio data to transmit the still image data.

Further, the configurations described in the first to fourth embodiments may be realized individually, or may be realized by arbitrarily combining them. In addition, the type and configuration of the mobile communication terminal device can be variously modified and implemented without departing from the gist of the present invention.

[0067]

As described above in detail, according to the present invention, at least one of a transmission period and a reception period of a radio signal is detected, and based on the detection result, at least one of the transmission period and the reception period includes: Stop the input of the imaging signal to the image signal processing unit, and also prohibit the power on / off operation of the camera and the lighting / extinguishing operation of the illuminator,
Further, the supply of the display signal to the display unit is stopped.

Therefore, according to the present invention, it is possible to prevent a camera or an illuminator and a radio transmission / reception signal from adversely affecting each other, thereby providing a mobile communication terminal device capable of improving signal quality. it can.

[Brief description of the drawings]

FIG. 1 is a front view showing the appearance of a PHS terminal which is a first embodiment of a mobile communication terminal device according to the present invention.

FIG. 2 is a block diagram showing a circuit configuration of the PHS terminal shown in FIG.

FIG. 3 is a diagram showing a PHS frame format and a usage example of a transmission / reception channel thereof.

FIG. 4 is a timing chart used to explain the operation of the PHS terminal shown in FIG. 2;

FIG. 5 is a circuit block diagram showing a second embodiment of the mobile communication terminal device according to the present invention.

FIG. 6 is a timing chart used to explain the operation of the PHS terminal shown in FIG. 5;

FIG. 7 is a circuit block diagram showing a third embodiment of the mobile communication terminal device according to the present invention.

FIG. 8 is a timing chart used to explain the operation of the PHS terminal shown in FIG. 7;

FIG. 9 is a circuit block diagram showing a fourth embodiment of the mobile communication terminal device according to the present invention.

FIG. 10 is a timing chart used to explain the operation of the PHS terminal shown in FIG. 9;

FIG. 11 is a fifth view of the mobile communication terminal device according to the present invention;
FIG. 4 is a timing chart for explaining the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Radio | wireless part 2 ... Baseband part 3 ... Input / output part 4 ... Power supply part 11 ... Antenna 12 ... Antenna duplexer (DPX) 13 ... Receiving circuit (RX) 14 ... Frequency synthesizer (SYN) 15 ... Transmission circuit (TX) DESCRIPTION OF SYMBOLS 21 ... Main control part 21a ... Transmission / reception period determination means 21b ... Camera output stop control means 21c ... Camera power on / off prohibition control means 21d ... Lighting prohibition control means 21e ... Display signal supply stop control means 22 ... Demultiplexing part 23 ... Audio Codec 24 ... Multimedia processing unit 25 ... LCD control unit 31 ... Microphone 32 ... Speaker 33 ... Camera 34 ... Liquid crystal display (LCD) 35 ... Key input unit 36 ... Lighting device 37 ... Battery saving circuit 41 ... Battery 42 ... Charging circuit (CHG) 43 ... Voltage generation circuit (PS)

Claims (4)

[Claims] 1. A camera for capturing an image of a subject, an image signal processing unit for performing predetermined signal processing on an image signal output from the camera for transmission, and a wireless unit for transmitting and receiving wireless signals in a time-division manner A mobile communication terminal device comprising: a detecting unit that detects at least one of a transmission period and a reception period of a radio signal by the radio unit; and at least one of a transmission period and a reception period according to a detection result of the detection unit. Stopping means for stopping the input of the imaging signal to the image signal processing unit during the period of. 2. A mobile communication terminal device comprising: a camera for capturing an image of a subject; and a radio unit for transmitting and receiving radio signals in a time-division manner, wherein at least one of a transmission period and a reception period of a radio signal by the radio unit is set. A moving device comprising: detecting means for detecting; and prohibiting means for prohibiting a power on / off operation of the camera in at least one of a transmission period and a reception period according to a detection result of the detection means. Communication terminal device. 3. A mobile communication terminal device comprising: an illuminator for illuminating at least one of a display and an operation key; and a radio unit for transmitting and receiving a radio signal in a time-division manner. Detecting means for detecting at least one of a receiving period and a detecting means for prohibiting lighting and extinguishing operations of the illuminator in at least one of the transmitting period and the receiving period according to a detection result of the detecting means. A mobile communication terminal device comprising: 4. A mobile communication terminal device comprising: a display unit; a display control unit that supplies a display signal to the display unit to display display information; and a wireless unit that transmits and receives wireless signals in a time-division manner. Detecting means for detecting at least one of a transmission period and a reception period of a radio signal by the radio unit; and in accordance with a detection result of the detection means, at least one of a transmission period and a reception period, A mobile communication terminal device comprising: a stop unit for stopping supply of a display signal.