JP2006217063A - Television function attached mobile information terminal and control method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a television function attached mobile information terminal and a control method thereof for preferentially relieving television reception by changing access timing of functions exerting adverse influences on the television reception when a television radio wave environment is deteriorated. <P>SOLUTION: When an alarm notice for denoting deterioration in a television radio wave environment is received from a TV module, functions not associated with television viewing but influencing the television viewing are stopped or suspended to prevent radiation of a noise component caused in background operations at the time of television viewing. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a mobile information terminal with a TV function that preferentially rescues TV reception when the TV radio wave environment deteriorates and a control method therefor.

  In recent years, mobile information terminal boards have become more dense due to their smaller size and higher functionality, and TV-related devices (especially TV modules) have become closely mounted on the same board as other function-related devices. Noise components generated from the device greatly interfere with television-related devices.

  Therefore, the point is how to suppress noise components generated from other devices, or to reduce the influence of noise on television-related devices.

Here, the mobile wireless terminal includes a first antenna, a first receiver, and a first transmitter, a first communication device that performs communication in the first frequency band, a second antenna, and a second antenna. And a second communication device that receives data such as video, images, and audio in the second frequency band, and when the second receiver is receiving, the first communication device Since the communication function of the communication device is stopped and the second reception unit is receiving data, radio waves are not transmitted from the first communication device, so the first communication device is the second communication device. By eliminating the effects on the mobile phone, when other wireless devices such as terrestrial digital TV receivers are mounted on the mobile phone, the effect of the radio waves transmitted from the wireless portion of the mobile phone by the receiver of the other wireless device is reduced. Techniques that operate without being received have been proposed (for example, patent documents) Reference).
JP 2004-207880 A

  However, the conventional example described above has the following problems.

  In situations where the TV radio wave environment is poor, noise due to background operation during TV viewing (other functions operate simultaneously with the TV function) suppresses the TV RF channel and the TV intermediate frequency. It will have an adverse effect.

  In addition, the high function increases the access speed to each function, and harmonic components due to high-speed access tend to adversely affect the TV RF channel and the TV intermediate frequency. This is because high-speed access has stronger spurious components than low-speed access, and tends to adversely affect the TV RF channel and TV intermediate frequency.

  In addition, due to higher functions such as a larger LCD liquid crystal screen, mobile information terminals are mainly in a folded form as shown in FIG. 17, and a plurality of substrates must be configured. As a result, the wiring length of the interface between the boards becomes long, and if this interface is accessed at a high speed at all times, the influence of digital noise scattered from the long wiring length becomes very large. It was.

  Therefore, the present invention provides a mobile information terminal with a TV function that preferentially rescues TV reception by changing the access timing of a function that adversely affects TV reception when the TV radio wave environment deteriorates, and a control method thereof. The purpose is to provide.

  According to the first aspect of the present invention, when an alarm notification is received from the TV module that the TV radio wave environment has deteriorated, a function that affects TV viewing is stopped or paused without being related to TV viewing, thereby enabling TV viewing. It is a mobile information terminal with a TV function that prevents the emission of noise components that sometimes occur in the background operation. This includes the sub LCD function, external memory function, mobile phone communication function, Bluetooth function, and GPS function. This is because the CPU has a hardware configuration in which the TV radio wave condition from the TV module can be monitored, and the CPU can power on / down each function (unit / module) via the power control circuit.

  According to the second aspect of the present invention, when an alarm notification is received from the TV module that the TV radio wave environment has deteriorated, the access speed of the built-in memory, the sub LCD unit, etc. is reduced so that the background operation is possible when watching TV. This is a mobile information terminal with a TV function that changes the frequency component of generated noise and reduces the influence on the TV RF channel or TV intermediate frequency. This is because the CPU can monitor the TV radio wave condition from the TV module, and by providing various access speed changing circuits between the interface between the CPU and each function (unit), the CPU can reduce the access speed. This is because of the hardware configuration.

  According to a third aspect of the present invention, when an alarm is received from the TV module that the TV radio wave environment has deteriorated, the noise interval generated by the background operation during TV viewing is shortened by changing the access cycle of the external memory. This is a mobile information terminal with a TV function that reduces the influence on the TV RF channel or TV intermediate frequency. This is because the CPU can monitor the TV radio wave condition from the TV module, and by providing an access cycle changing circuit for external memory between the CPU and the external memory, the access cycle can be made intermittent and the influence of noise can be reduced. This is because the hardware configuration can be shortened.

  According to the fourth aspect of the present invention, when an alarm is received that the TV radio wave environment has deteriorated from the TV module, the frequency component of noise generated in the background operation when watching TV is changed by changing the frame rate of the LCD unit. It is a mobile information terminal with a television function that changes and reduces the influence on the television RF channel or television intermediate frequency. This is because the CPU can monitor the TV radio wave condition from the TV module, and by providing a frame rate changing circuit for LCD between the CPU and the LCD unit, the hardware configuration can reduce the frame rate. It is.

  The invention according to claim 5 is a mobile information terminal with a TV function that powers down an LCD unit that affects TV viewing (= LCD display OFF) upon receiving an alarm from the TV module that the TV radio wave environment has deteriorated. . Stopping the LCD unit means that television viewing cannot be maintained, so it is necessary to power on the recording function before stopping the function of the LCD unit. This is because the CPU can monitor the TV signal condition from the TV module, the CPU can power on / down the LCD unit via the power control circuit, and the recording circuit can be powered on before the LCD unit stops functioning. This is because the hardware configuration can be configured.

  According to the sixth aspect of the present invention, when an alarm notification is received from the TV module that the TV radio wave environment has deteriorated, a function that affects TV viewing is stopped or paused without being related to TV viewing, thereby enabling TV viewing. This is a method for controlling a mobile information terminal with a television function that prevents radiation of noise components that sometimes occur in the background operation. This includes the sub LCD function, external memory function, mobile phone communication function, Bluetooth function, and GPS function. This is because the CPU has a hardware configuration in which the TV radio wave condition from the TV module can be monitored, and the CPU can power on / down each function (unit / module) via the power control circuit.

  According to the seventh aspect of the present invention, when an alarm notification is received from the TV module that the TV radio wave environment has deteriorated, the access speed of the built-in memory, the sub LCD unit, etc. is reduced so that the background operation can be performed when watching TV. This is a control method for a mobile information terminal with a TV function that changes the frequency component of generated noise and reduces the influence on the TV RF channel or TV intermediate frequency. This is because the CPU can monitor the TV radio wave condition from the TV module, and by providing various access speed changing circuits between the interface between the CPU and each function (unit), the CPU can reduce the access speed. This is because of the hardware configuration.

  According to the eighth aspect of the present invention, when an alarm is received from the TV module that the TV radio wave environment has deteriorated, the access period of the external memory is changed, thereby shortening the noise interval generated in the background operation during TV viewing. Thus, this is a method for controlling a mobile information terminal with a TV function that reduces the influence on the TV RF channel or the TV intermediate frequency. This is because the CPU can monitor the TV radio wave condition from the TV module, and by providing an access cycle changing circuit for external memory between the CPU and the external memory, the access cycle can be made intermittent and the influence of noise can be reduced. This is because the hardware configuration can be shortened.

  According to the ninth aspect of the present invention, when an alarm is received from the TV module that the TV radio wave environment has deteriorated, the frame rate of the LCD unit is changed to reduce the frequency component of noise generated in the background operation during TV viewing. This is a control method for a mobile information terminal with a TV function, which is changed to reduce the influence on the TV RF channel or TV intermediate frequency. This is because the CPU can monitor the TV radio wave condition from the TV module, and by providing a frame rate changing circuit for LCD between the CPU and the LCD unit, the hardware configuration can reduce the frame rate. It is.

  According to the tenth aspect of the present invention, when an alarm is received from the TV module that the TV radio wave environment has deteriorated, the control of the mobile information terminal with a TV function that powers down the LCD unit that affects TV viewing (= LCD display OFF). Is the method. Stopping the LCD unit means that television viewing cannot be maintained, so it is necessary to power on the recording function before stopping the function of the LCD unit. This is because the CPU can monitor the TV signal condition from the TV module, the CPU can power on / down the LCD unit via the power control circuit, and the recording circuit can be powered on before the LCD unit stops functioning. This is because the hardware configuration can be configured.

  According to the mobile information terminal with a TV function and the control method thereof according to the present invention, when the TV radio wave environment is deteriorated, the TV reception is preferentially remedied by changing the access timing of the function that adversely affects the TV reception. be able to.

  Next, an embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a diagram showing an overall configuration of a mobile information terminal with a television function in the present embodiment.

  Referring to FIG. 1, a TV radio wave (TV RF channel) received by a TV receiving antenna is down-converted to an intermediate frequency by a tuner unit of the TV module 110, and then detected and demodulated.

  The TV module 110 has a function capable of detecting the reception level of TV radio waves. When the reception level falls below a specified value, the TV module 110 determines that the TV radio wave environment has deteriorated, and notifies the CPU 100 from the TV module 110.

  The video output (video composite signal) detected and demodulated by the TV module 110 is input to the video signal converter 111, where A / D conversion is performed. It is converted into a digital video signal (YCBCr video component signal) via a video decoder and output to the video / RGB converter 112 at a frame period.

  The video signal is converted into RGB data (color information) by the video / RGB converter 112, and the RGB data is output to the LCD unit 140 (including the LCD driver + liquid crystal).

  When the TV module 110 notifies the TV module 110 that the TV radio wave environment has deteriorated, the CPU 100 maintains the TV viewing and maintains each function (mobile phone communication wireless module 180) via the power control circuit 110. , The sub LCD unit 150, the external memory 120, the Bluetooth module 170, and the GPS module 160) are powered down.

  When the TV module 110 notifies the TV module 110 that the TV radio wave environment has deteriorated, the CPU 100 maintains the TV viewing and maintains the access speed change circuit 103 for the internal memory that controls the interface between the internal memory 130 and the CPU 100. The access speed change is notified, and the communication speed with the built-in memory 130 is reduced.

  It is assumed that the CPU 100 does not need to frequently access the built-in memory 130 in which the program is stored when watching TV. This is because if the CPU 100 frequently accesses the built-in memory 130 when watching the television, the CPU performance is lowered by reducing the access speed to the built-in memory 130, which affects the television viewing. It is.

  As the interface with the built-in memory 130 is generally a parallel interface using an address / data bus, when an alarm notification is received that the TV radio wave environment has deteriorated, the built-in memory access speed changing circuit 103 For example, as shown in FIG. 5, the wait value is increased (the REA / D pulse is increased by one clock) to reduce the access speed.

  Further, when the TV module 110 is notified that the TV radio wave environment has deteriorated, the CPU 100 maintains the TV viewing and maintains the television LCD access speed changing circuit 105 that controls the interface between the sub LCD unit 150 and the CPU 100. The access speed change is notified to reduce the communication speed with the sub LCD unit 150.

  It is assumed that the CPU 100 does not need to frequently access the sub LCD unit 150 when watching TV.

  When the interface with the sub LCD unit 150 is a parallel interface using an address / data bus, the sub LCD access speed changing circuit 105 receives, for example, an alarm notification that the TV radio wave environment has deteriorated. As shown in FIG. 5, the wait value is increased (the REA / D pulse is increased by one clock) to reduce the access speed.

  Next, a mobile information terminal having a recording function will be described with reference to FIG.

  The TV radio wave (TV RF channel) received by the TV receiving antenna is down-converted to an intermediate frequency by the tuner unit of the TV module 110, and then detected and demodulated.

  The TV module 110 has a function capable of detecting the reception level of TV radio waves. When the reception level falls below a specified value, the TV module 110 determines that the TV radio wave environment has deteriorated, and notifies the CPU 100 from the TV module 110.

  The CPU 100 powers on the recording function, and then stops the LCD unit 140 via the power control circuit 101.

  The video output (video composite signal) detected and demodulated by the TV module 110 is input to the video signal converter 111, where A / D conversion is performed. It is converted into a digital video signal (YCBCr video component signal) via a video decoder and output to the recording circuit 113 at a frame period.

  The recording circuit 113 is equipped with a moving image encoder function and has a function of compressing a video signal. When the compression is completed, the recording circuit 113 delivers it to the CPU as needed, and the CPU 100 passes the compressed data to the external memory access cycle changing circuit 102 via BUS. In this access cycle, the external memory access cycle change circuit 102 transfers the compressed video data to the external memory 120.

  In addition, the increase in the capacity of the memory built in the mobile information terminal is not advantageous because of its cost and miniaturization. Therefore, the data recorded on the TV is generally registered in an external memory such as a memory card. Therefore, access to the external memory is indispensable during recording, but since the access to the external memory is continuous access, digital noise generated at this time may adversely affect TV viewing.

  Therefore, the external memory access cycle changing circuit 102 that controls the interface between the external memory 120 and the CPU 100 is provided with a function that can change the access cycle, and when an alarm notification is received from the TV module 110 that the TV radio wave environment has deteriorated. The CPU 100 remains in a state in which the television recording can be maintained with respect to the block relating to the television recording, and the CPU 100 notifies the external memory access cycle changing circuit 102 that controls the interface between the external memory 120 and the CPU 100 of the change of the access cycle. The access cycle with the memory 120 is changed to an intermittent cycle.

  Hereinafter, the hardware configuration will be described with reference to FIG. 2, and an example of changing the external memory access cycle will be described with reference to FIG.

  As shown in FIG. 6, in the case of external memory access that affects the TV radio wave environment, when the access is always made, the result is that the TV viewing screen is always disturbed. Therefore, this continuous access is changed to the intermittent access at high speed by the access cycle change circuit 102 for the external memory, and the TV recording screen is intermittently disturbed so that it can withstand TV viewing / recording. It is also possible to shorten the time.

  When the TV radio wave environment is good, the compressed data is not stored in the external memory 120 during TV recording, but the CPU 100 stores the compressed data directly in the external memory 120 via the external memory access cycle changing circuit 102. .

  If it is determined that the radio wave environment is inferior, the CPU 100 first powers up the internal work memory 114 via the external memory access cycle changing circuit 102.

  The CPU 100 once passes the compressed data handed from the recording circuit 113 to the external memory access cycle changing circuit 102 via the BUS.

  The external memory access cycle changing circuit 102 stores the received compressed data in the finite internal work memory 114.

  The external memory access cycle changing circuit 102 manages the free information of the internal work memory 114, and when the internal work memory 114 determines that the remaining free space is small, the compressed data is taken up from the internal work memory 114 and automatically transferred to the external memory 120 at high speed. Forward.

  FIG. 4 is a hardware configuration diagram for varying the access speed (frame rate) of the inter-board interface when the LCD unit television-related devices are arranged on different boards.

  The CPU 100 that has received an alarm notification from the TV module 110 that the TV radio wave environment has deteriorated notifies the LCD frame rate changing circuit 118 that controls the interface between the video / RGB converter 112 and the CPU 100 of the frame rate change. To slow down.

  Since this interface is generally a clock-synchronized serial, the LCD frame rate changing circuit 118 divides the clock signal and the frame signal and reduces the frame rate to rescue television reception.

  Hereinafter, an embodiment in which the LCD access frequency is suppressed will be described in detail using the built-in circuit of the frame data compare circuit 202 with reference to FIG.

  As an initial setting, the CPU 100 powers up the compare / data transfer controller 201 and does not power up the compare circuit 202, the CPU transfer memory 205, the image memory A203, and the image memory B204.

  When the TV radio wave environment is good, the CPU 100 is set to output the image data from the video signal converter 111 to the CPU 100 through the compare / data transfer controller 201.

  When receiving an alarm notification from the TV module 110 that the TV radio wave environment has deteriorated, the CPU 100 powers on the compare circuit 202, the CPU transfer memory 205, the image memory A203, and the image memory B204 via the compare / data transfer controller 201.

  The compare / data transfer controller 201 sequentially stores the image data from the video signal converter 111 between the image memory A • 203 and the image memory B • 204 for each frame.

  However, the compare / data transfer controller 201 must manage which image memory stores the latest data / old data before one frame.

  The compare / data transfer controller 201 causes the compare circuit 202 to compare the data stored in the memory A 204 and the image memory B 205 for each frame.

  The compare timing is instructed by the compare / data transfer controller 201 for each frame.

  If the comparison result in the compare circuit 202 determines that the data is different between frames, the compare / data transfer controller 201 uses the updated latest image data stored in either the image memory A / image memory B as the CPU. Transfer to the transfer memory 205.

  The compare / data transfer controller 201 notifies the CPU 100 as a CPU transfer memory 205 storage completion notification (compare end notification).

  The CPU 100 reads one frame data in the CPU transfer memory 205 via the compare / data transfer controller 201 and transmits a command of the acquired update image data to the LCD controller 210 via the BUS.

  Hereinafter, an embodiment in which the LCD frame rate using the LCD frame rate changing circuit 118 is lowered will be described in detail using the built-in circuit of the LCD frame rate changing circuit 118 with reference to FIG.

  As an initial setting, the CPU 100 powers up the frame rate changing circuit 302 via the LCD frame rate controller 301 and outputs the video signal converter 111 to the video / RGB converter 112 through the frame rate changing circuit 302. To do. Therefore, the image memory C303 is not yet powered up.

  When receiving an alarm notification from the TV module 110 that the TV radio wave environment has deteriorated, the CPU 100 powers up the image memory C303 capable of storing image data for one frame via the LCD frame rate controller 301, and the frame rate changing circuit 302. On the other hand, the frame rate changing circuit 302 for setting whether to reduce the speed to 1 / n times the current frame rate divides the frame signal and clock signal output from the video signal converter 111 by 1 / n times set as described above. To do.

  The LCD frame rate controller 301 sequentially overwrites the data output from the video signal converter 111 to the image memory C 303 for each frame, reads the image data from the image memory 303 at the set frame rate timing, and sends it to the frame rate changing circuit 302. Notice.

  The frame rate changing circuit 302 places the received image data on the frame signal and clock signal generated in S120 and transfers them to the video / RGB converter 112.

  Hereinafter, a processing flow for relieving television reception by powering off the sub LCD unit 150 in the present embodiment will be described with reference to FIG. Refer to FIG. 1 for the hardware configuration diagram.

  When watching TV, it is determined whether or not the TV module 110 has notified the CPU 100 that the TV radio wave environment has deteriorated (S101).

  If YES (poor determination), the process proceeds to S102, and if NO (good determination), no action is taken and TV viewing is continued.

  In YES (poor determination), the CPU 100 instructs the power control circuit 101 to power down the sub LCD unit 150 (S102). The power control circuit 101 powers down the sub LCD unit 150.

  With the above processing flow, it is possible to eliminate the influence of the digital noise on the television viewing by accessing the sub LCD unit 150.

  Next, a processing flow for relieving television reception by powering off the external memory 120 will be described with reference to FIG. Refer to FIG. 1 for the hardware configuration diagram.

  When watching TV, it is determined whether or not the TV module 110 has notified the CPU 100 that the TV radio wave environment has deteriorated (S101).

  If YES (poor determination), the process proceeds to S103, and if NO (good determination), no action is taken and TV viewing is continued.

  In YES (poor determination), the CPU 100 instructs the power control circuit 101 to power down the external memory 120 (S103). The power control circuit 101 powers down the external memory 120.

  With the above processing flow, it is possible to eliminate the influence of digital noise on TV viewing by accessing the external memory 120.

  A processing flow for relieving television reception by reducing the access speed of the built-in memory 130 will be described below with reference to FIG. Refer to FIG. 1 for the hardware configuration diagram.

  When watching TV, it is determined whether or not the TV module 110 has notified the CPU 100 that the TV radio wave environment has deteriorated (S101).

  If YES (poor determination), the process proceeds to S108, and if NO (good determination), no action is taken and TV viewing is continued.

  If YES (poor determination), the CPU 100 instructs the built-in memory access speed changing circuit 103 to lower the access speed (S108).

  Then, the built-in memory access speed changing circuit 103 increases the wait value (increases the REA / D pulse and WRITE pulse) and decreases the access speed (S109).

  With the above processing flow, it is possible to reduce the influence of digital noise on the television viewing due to the access speed of the built-in memory 130.

  Hereinafter, a processing flow for relieving television reception by reducing the access speed of the sub LCD unit 150 will be described with reference to FIG. Refer to FIG. 1 for the hardware configuration diagram.

  When watching TV, it is determined whether or not the TV module 110 has notified the CPU 100 that the TV radio wave environment has deteriorated (S101).

  If YES (poor determination), the process proceeds to S110, and if NO (good determination), no action is taken and TV viewing is continued.

  If YES (poor determination), the CPU 100 instructs the sub LCD access speed changing circuit 105 to lower the access speed (S110).

  If the sub LCD interface is a parallel interface, the sub LCD access speed change circuit 105 increases the wait value (increases the REA / D pulse and WRITE pulse) to reduce the access speed, and the sub LCD interface is a serial interface. If so, the access speed is lowered by lowering the clock speed (S111).

  With the above processing flow, it is possible to reduce the influence of digital noise on the television viewing due to the access speed of the sub LCD unit 150.

  A processing flow for relieving television recording by powering down the LCD unit 140 will be described below with reference to FIG. Refer to FIG. 2 for the hardware configuration diagram.

  When watching TV, it is determined whether or not the TV module 110 has notified the CPU 100 that the TV radio wave environment has deteriorated (S101).

  If YES (poor determination), the process proceeds to S112, and if NO (good determination), no action is taken and TV viewing is continued.

  In YES (poor determination), the CPU 100 instructs the recording circuit 113 to power up (S112).

  Then, the CPU 100 instructs the power control circuit 101 to power up the external memory 120 (S113). Since the data compressed in the recording circuit 113 is stored in the external memory 120 via the external memory access cycle changing circuit 102 in the CPU 100, the external memory 120 needs to be powered up.

  Next, the CPU 100 instructs the recording circuit 113 to start recording (S114). By this command, the moving image encoding function in the recording circuit is powered up and the compression process is started. Further, the CPU 100 stores the compressed data in the external memory 120 via the external memory access cycle changing circuit 102.

  Then, the CPU 100 instructs the power control circuit 101 to power down the LCD unit 140 (S115). The power control circuit 101 powers down the LCD unit 140.

  With the above processing flow, it is possible to reduce the influence of digital noise due to access of the LCD unit 140 on television recording.

  The processing flow for relieving television recording by setting the access cycle of the external memory 120 to intermittent timing will be described below with reference to FIG. Refer to FIG. 2 for the hardware configuration diagram.

  When watching TV, it is determined whether or not the TV module 110 has notified the CPU 100 that the TV radio wave environment has deteriorated (S101).

  If YES (poor determination), the process proceeds to S122, and if NO (good determination), no action is taken and TV viewing is continued.

  In YES (poor determination), the CPU 100 instructs the external memory access cycle changing circuit 102 to change to the intermittent access cycle (S122). The external memory access cycle changing circuit 102 powers up the internal work memory 114 and then stores the compressed data transferred from the CPU 100 in the finite internal work memory 114.

  Then, since the external memory access cycle changing circuit 102 manages the vacant information in the finite internal work memory 114, it is determined whether or not the state is close to FULL (S123).

  If YES (if it is FULL determination), the process proceeds to S124. If NO (not FULL determination), the process of storing the compressed data transferred from the CPU 100 in the internal work memory 114 is continued.

  Next, the external memory access cycle changing circuit 102 transfers the compressed data from the internal work memory 114 to the external memory at a high speed (S124). Note that when the above processing is completed, the process proceeds to S123.

  With the above processing flow, the access timing of the external memory 120 can be made intermittent, and the access time can be shortened. As a result, the influence of digital noise on TV viewing can be reduced. That is, the external memory access can be suspended until the compressed data is stored in the internal work memory.

  A processing flow for relieving TV viewing by reducing the frame rate of the LCD unit 140 will be described below with reference to FIG. For the hardware configuration diagram, refer to FIG.

  As an initial setting for television viewing, the CPU 100 powers up the frame rate changing circuit 302 via the LCD frame rate controller 301 and sets the video signal converter 111 output to the video / RGB converter 112 through (S118). .

  When watching TV, it is determined whether or not the TV module 110 has notified the CPU 100 that the TV radio wave environment has deteriorated (S101).

  If YES (poor determination), the process proceeds to S119, and if NO (good determination), no action is taken and TV viewing is continued.

  If YES (poor determination), the CPU 100 instructs the image memory C303 to be powered up via the LCD frame rate controller 301 (S119).

  Then, the CPU 100 instructs the frame rate changing circuit 302 via the LCD frame rate controller 301 to reduce the speed to 1 / n times the current frame rate (S120). The frame rate changing circuit 302 divides the frame signal and clock signal output from the video signal converter by 1 / n times as set. The LCD frame rate controller 301 sequentially overwrites the data output from the video signal converter 111 on an image memory C303 capable of storing image data for one frame for each frame.

  Next, at the frame rate timing set in S120, the LCD frame rate controller 301 reads the image data from the image memory 303 and notifies the frame rate changing circuit 302 of it (S121). The frame rate changing circuit 302 places the received image data on the frame signal and clock signal generated in S120 and transfers them to the video / RGB converter 112.

  With the above processing flow, the frame rate of the LCD unit 140 can be reduced, and the influence of digital noise on TV viewing can be reduced.

  Hereinafter, a processing flow for relieving television viewing by suppressing the access frequency of the LCD unit 140 will be described with reference to FIG. Note that FIG. 3 and FIG. 8 are referred to for the hardware configuration diagram.

  As an initial setting for watching TV, the CPU 100 powers up the compare / data transfer controller 201, and the compare circuit 202, CPU transfer memory 205, image memory A • 203, and image memory B • 204 are not powered up (S127). When the TV radio wave environment is good, the CPU 100 is set to output the image data from the video signal converter 111 to the CPU 100 through the compare / data transfer controller 201.

  When watching TV, it is determined whether or not the TV module 110 has notified the CPU 100 that the TV radio wave environment has deteriorated (S101).

  If YES (poor determination), the process proceeds to S128, and if NO (good determination), no action is taken and TV viewing is continued.

  In YES (poor determination), the CPU 100 powers on the compare circuit 202, the CPU transfer memory 205, the image memory A203, and the image memory B204 via the compare / data transfer controller 201.

  Then, the compare / data transfer controller 201 sequentially stores the image data from the video signal converter 111 between the image memory A 203 and the image memory B 204 for each frame (S129). However, the compare / data transfer controller 201 must manage which image memory stores the latest data / one frame previous data.

  Next, the compare / data transfer controller 201 causes the compare circuit 202 to compare the data stored in the memory A 204 and the image memory B 205 for each frame (S130).

  The compare timing is instructed from the compare / data transfer controller 201 for each frame. If the comparison result in the compare circuit 202 is NO (determined as different data), the process proceeds to S131, and if YES (determined as the same data), the process proceeds to S129.

  The compare / data transfer controller 201 transfers the updated latest image data stored in either the image memory A / image memory B to the CPU transfer memory 205 (S131). Here, the compare / data transfer controller 201 notifies the CPU 100 as a storage completion notification of the CPU transfer memory 205. In addition, the CPU 100 reads one frame data in the CPU transfer memory 205 via the compare / data transfer controller 201 and transmits a command of the acquired update image data to the LCD controller 210 via the BUS.

  With the above processing flow, the access frequency of the LCD unit 140 can be suppressed, and the influence of digital noise on TV viewing can be reduced.

  As described above, according to the present embodiment, when the TV radio wave environment deteriorates, the TV radio wave environment can be improved without affecting TV viewing at all. The reason is that it is possible to reduce noise components that affect the TV RF channel and the TV intermediate frequency by powering down blocks that are completely unrelated to the TV function.

  In addition, when the TV radio wave environment deteriorates, the TV radio wave environment can be improved by a method that does not affect the TV viewing as much as possible. The reason is that noise that affects the TV RF channel and the TV intermediate frequency by reducing the access speed, changing the access cycle, and reducing the access frequency for each block at a level that does not affect TV viewing. This is because the components can be reduced.

  When the TV radio wave environment deteriorates, blocks that affect TV viewing, especially the method of improving the TV radio wave environment by powering down the LCD unit, can automatically shift to TV recording processing to rescue TV viewing. it can. If the TV recording process is performed normally, it can be played back later, and the TV program you want to watch will not be missed. The reason is that by installing a recording circuit, it is possible to power down blocks that affect TV viewing, and it is possible to reduce digital noise that affects the TV F channel and TV intermediate frequency during recording. It is to become.

  Each of the above-described embodiments is a preferred embodiment of the present invention, and various modifications can be made without departing from the scope of the present invention. For example, on / off switching of “TV reception priority mode” can be made in advance by user selection, and the present invention is applied when “TV reception priority mode” is set to ON. Further, if the “TV reception priority mode” is set to OFF, the function for improving the TV radio wave environment may not be activated even if the TV radio wave environment deteriorates as in the past.

  As described above, due to the inferiority of the TV radio wave environment, there is also a function for sequentially changing the procedure for relieving TV viewing, such as power-down of each function and reduction in access speed / access timing / access frequency of each function.

  For example, if the power of the sub LCD unit is reduced and the TV radio wave environment is not improved, the next Bluetooth module is powered down. If the TV radio wave environment is still not improved, the GPS module is powered down. For example, if it is determined that the TV radio wave environment cannot be improved by one measure, it has the function of shifting to the next measure. It may be. In addition, as a transition point, it is determined that it is difficult to watch TV in real time, in order starting from a measure that has little influence on TV viewing, and the recording function is activated by powering down the LCD unit. May be.

  Further, the processing for realizing the function of the mobile information terminal with the TV function may be performed by causing the apparatus to read and execute the program for realizing the function of the mobile information terminal with the TV function in the above embodiment. . Further, the program is transmitted to another computer system by a transmission wave via a CD-ROM or a magneto-optical disk that is a computer-readable recording medium, or via the Internet or a telephone line that is a transmission medium. Also good.

It is a block diagram of the mobile information terminal with a television function in the embodiment of the present invention. It is a block diagram of the mobile information terminal with a television function in the embodiment of the present invention. It is a block diagram of the mobile information terminal with a television function in the embodiment of the present invention. It is a figure which shows the example of a change of LCD access. It is a figure which shows the example of a change of memory access. It is a figure which shows the example of a change of an external memory access period. It is a figure which shows the frame data compare circuit in embodiment of this invention. It is a figure which shows the frame rate change circuit for LCD in embodiment of this invention. It is a flowchart for demonstrating the processing operation which rescues television viewing-and-play in embodiment of this invention. It is a flowchart for demonstrating the processing operation which rescues television viewing-and-play in embodiment of this invention. It is a flowchart for demonstrating the processing operation which rescues television viewing-and-play in embodiment of this invention. It is a flowchart for demonstrating the processing operation which rescues television viewing-and-play in embodiment of this invention. It is a flowchart for demonstrating the processing operation which rescues television viewing-and-play in embodiment of this invention. It is a flowchart for demonstrating the processing operation which rescues television viewing-and-play in embodiment of this invention. . It is a flowchart for demonstrating the processing operation which rescues television viewing-and-play in embodiment of this invention. It is a flowchart for demonstrating the processing operation which rescues television viewing-and-play in embodiment of this invention. It is a figure which shows the folding form of the mobile information terminal in a prior art example.

Explanation of symbols

100 CPU
101 Power Control Circuit 103 Internal Memory Access Speed Change Circuit 105 Sub LCD Access Speed Change Circuit 110 TV Module 111 Video Signal Converter 112 Video / RGB Converter 120 External Memory 130 Internal Memory 140 LCD Unit 150 Sub LCD Unit 160 GPS Module 170 Bluetooth Module 180 Wireless module for mobile phone communication

Claims (10)

  When an alarm notification is received from the TV module indicating that the TV signal environment has deteriorated, noise that occurs in the background operation when watching TV by stopping or temporarily suspending functions that affect TV watching that are not related to TV watching A mobile information terminal with a TV function characterized by preventing emission of components.   When an alarm notification is received from the TV module that the TV signal environment has deteriorated, the frequency component of the noise generated by the background operation when watching TV is changed by reducing the access speed of the built-in memory, sub LCD unit, etc. And a mobile information terminal with a TV function, characterized in that the influence on the TV RF channel or the TV intermediate frequency is reduced.   When an alarm is received that the TV radio wave environment has deteriorated from the TV module, by changing the access cycle of the external memory, the noise interval generated by the background operation when watching TV is shortened, so that the TV RF channel or TV A mobile information terminal with a television function, characterized in that the influence on the intermediate frequency is reduced.   When an alarm is received from the TV module that the TV radio wave environment has deteriorated, the frequency component of the noise generated in the background operation when watching TV is changed by changing the frame rate of the LCD unit. A mobile information terminal with a television function, characterized in that the influence on the intermediate frequency is reduced.   A mobile information terminal with a TV function, characterized in that when an alarm is received from the TV module that the TV radio wave environment has deteriorated, the LCD unit that affects TV viewing is powered down.   When an alarm notification is received from the TV module indicating that the TV signal environment has deteriorated, noise that occurs in the background operation when watching TV by stopping or temporarily suspending functions that affect TV watching that are not related to TV watching A method for controlling a mobile information terminal with a television function, wherein the radiation of components is prevented.   When an alarm notification is received from the TV module that the TV signal environment has deteriorated, the frequency component of the noise generated by the background operation when watching TV is changed by reducing the access speed of the built-in memory, sub LCD unit, etc. And a method for controlling a mobile information terminal with a television function, wherein an influence on a television RF channel or a television intermediate frequency is reduced.   When an alarm is received that the TV radio wave environment has deteriorated from the TV module, by changing the access cycle of the external memory, the noise interval generated by the background operation when watching TV is shortened, so that the TV RF channel or TV A method for controlling a mobile information terminal with a television function, characterized by reducing influence on an intermediate frequency.   When an alarm is received from the TV module that the TV radio wave environment has deteriorated, the frequency component of the noise generated in the background operation when watching TV is changed by changing the frame rate of the LCD unit. A method for controlling a mobile information terminal with a television function, characterized by reducing influence on an intermediate frequency.   A control method for a mobile information terminal with a TV function, wherein when an alarm is received from a TV module that the TV radio wave environment has deteriorated, an LCD unit that affects TV viewing is powered down.

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