JP4460960B2 - Broadcast receiving apparatus and cooling method thereof - Google Patents

Description

  The present invention relates to a broadcast receiving apparatus, and more particularly to a portable small broadcast receiving apparatus and a cooling method thereof.

  In recent years, mobile broadcasting that can enjoy multi-channel broadcasting services while moving has been put into practical use. Mobile broadcasts send stronger radio waves (used frequency is 2.6 GHz band called S band) than dedicated BS broadcasts and CS broadcasts (used frequency is 12 GHz band), so the terminal side is small The antenna can be received while moving. In such a portable small receiving terminal for mobile broadcasting, a tuner as a front-end processor becomes a large heat source, and the trouble due to the heat becomes a problem. For example, continuous use for a long time may cause the temperature of the apparatus to rise, resulting in exceeding the operation compensation temperature of other components in the apparatus, or the tuner itself may malfunction due to the heat. Furthermore, there is a risk that high-temperature devices may affect the human body (burn). Therefore, measures to prevent overheating are necessary.

  As a conventional representative overheat prevention measure, there is a technique adopted in a portable computer. For example, two CPU cooling functions, ie, a reduction in CPU operating speed and rotation of an electric fan, are provided, and the CPU is effectively overheated by effectively combining these two cooling functions according to the setting of the cooling mode by the user. (For example, refer to Patent Document 1).

However, although the operation speed has decreased in any function, the CPU has not stopped operating, and depending on the degree of temperature rise, there is a possibility that it cannot be quickly cooled only by the rotation of the electric fan or cannot be completely cooled. is there. In a device smaller than a personal computer, for example, a mobile broadcast receiving terminal, this possibility is high because the electric fan is also small and the cooling effect is small.
Japanese Patent Laid-Open No. 11-110085 (paragraph 0009)

  As described above, the conventional overheat prevention function has a drawback that a sufficient cooling effect cannot be obtained particularly in a small-sized device.

  An object of the present invention is to provide a broadcast receiving apparatus capable of cooling the temperature of the apparatus in a short time and a cooling method thereof.

  In order to solve the above problems and achieve the object, the present invention uses the following means.

A broadcast receiving apparatus according to an aspect of the present invention includes:
A tuner for receiving a broadcast wave including a digital broadcast wave and still image data ;
A digital signal processor for processing broadcast data output from the tuner;
Recording means for recording the still image data;
Cooling means;
An overheat preventing means that has a temperature sensor and stops operation of the tuner when the temperature above a predetermined temperature is detected, operates the cooling means, and stops operation of the digital signal processor ;
Means for reproducing still image data read from the recording means even when the operation of the tuner and the digital signal processor is stopped .

A broadcast receiving apparatus according to another aspect of the present invention provides:
An external power supply,
An internal power supply,
A tuner that receives broadcast waves;
Cooling means;
When it has a temperature sensor and operates with an external power supply, it detects the temperature above a predetermined temperature, stops the tuner operation, operates the cooling means, and operates with an internal power supply. When the temperature equal to or higher than the temperature is detected, the tuner is stopped, but the cooling means is not operated.

According to another aspect of the present invention, there is provided a cooling method for a broadcast receiving apparatus including a tuner that receives a broadcast wave including still image data, a recording unit that records still image data, and a cooling unit.
Measuring the temperature,
When the temperature is equal to or higher than a predetermined temperature, the operation of the tuner is stopped, and the cooling means is operated .
Even when the operation of the tuner is stopped, the still image data read from the recording means is reproduced .

According to another aspect of the present invention, there is provided a cooling method for a broadcast receiving apparatus including an external power source, an internal power source, a tuner that receives broadcast waves, and a cooling unit.
Measure the temperature,
When operating with an external power source, if the temperature is above a predetermined temperature, stop the tuner, operate the cooling means, and when operating with an internal power source, if the temperature is above a predetermined temperature, The operation of the tuner is stopped, but the cooling means is not operated.

  As described above, according to the present invention, it is possible to provide a broadcast receiving apparatus and a cooling method thereof that can cool the temperature of the apparatus in a short time.

  Embodiments of a broadcast receiving apparatus and a cooling method thereof according to the present invention will be described below with reference to the drawings.

First Embodiment FIG. 1 is a block diagram showing a configuration of a broadcast receiving apparatus according to a first embodiment of the present invention. The broadcast receiving apparatus includes a tuner (front end processor) 2, a transport stream data separator 4, a digital signal processor (DSP) 6, a graphic controller 8, and a display device 10 as a video processing system. The tuner 2, the transport stream data separator 4, the DSP 6, and the graphic controller 8 are controlled by the CPU 16 via the system bus 30. A solid line in FIG. 1 indicates a data flow, a broken line indicates a control flow, and a one-dot chain line indicates a power supply control flow.

  The tuner 2 receives a channel of a specific broadcasting station from digital broadcasting waves received via an antenna, receives video and audio data, and receives program information transmitted from the broadcasting station. The program information is, for example, broadcast schedule data of a program transmitted from a broadcasting station every week, and is composed of a title, a start date / time, an end date / time, a classification, a program content description, and the like for each program.

  The output of the tuner 2 is supplied to the transport stream data separator 4, the video / audio data is stored in the DSP 6, and the stored data and program information are stored in the internal storage device 18 of the CPU 16 via the system bus 30. Mobile broadcasting includes data broadcasting as well as video and audio, and still images such as home pages are stored in the internal storage device 18 as accumulated data.

  In the DSP 6, the video signal and the digital audio signal are separated, and the video signal is supplied to the graphic controller 8 and displayed on the display device 10 such as an LCD panel. The digital audio signal is converted into an analog audio signal by the D / A converter 12 and output from the audio output device 14. The audio output device 14 may be a built-in speaker or headphones. The D / A converter 12 is also controlled by the CPU 16 via the system bus 30.

  An SD card controller 20 as an interface of an external storage device 22 composed of an SD (Secure Digital) card (memory card) is also connected to the system bus 30. The SD card controller 20 is also controlled by the CPU 16 via the system bus 30. The external storage device 22 stores video and audio recordings and recording data.

  A cooling device 26 comprising an electric fan for cooling the entire device, particularly the tuner 2 is provided. Operations of the tuner 2, the DSP 6, and the cooling device 26 are controlled by the power supply control device 24 connected to the system bus 30.

  A temperature sensor 32 that measures the temperature of the apparatus is also connected to the system bus 30, and temperature data is input to the CPU 16. A key input unit 34 for inputting various operation instructions such as channel selection and volume adjustment is also connected to the system bus 30.

  Although not shown, the portable broadcast receiving apparatus is supplied with power from an external power source and an internal power source so that it can be operated not only by a commercial external power source but also by an internal power source such as a rechargeable battery.

  FIG. 2 is a flowchart of the CPU 16 for explaining the operation of the present embodiment. When the apparatus power is turned on and broadcast reception is started, temperature data from the temperature sensor 32 is acquired in step S12. In step S14, it is determined whether or not the temperature is equal to or higher than a predetermined temperature that is an upper limit of an allowable temperature at which the apparatus operates. When the temperature is not higher than the predetermined temperature, the process from step S12 is repeatedly executed, and the broadcast reception is continued. If the temperature is equal to or higher than the predetermined temperature, reception is interrupted in step S16. That is, the power of the tuner 2 and the DSP 6 is turned off via the power control device 24, and the power of the cooling device 26 is turned on via the power control device 24. Thereby, the apparatus is forcibly cooled. Only the tuner 2 and the DSP 6 turn off the power, and the other parts including the CPU 16 are turned on. In this case, there is no distinction between an external power supply and an internal power supply. After the reception is interrupted, the DSP 6 is off, so that it is impossible to receive and play a moving image. However, the stored data stored in the internal storage device 18 can be displayed even when the DSP 6 is off. Since the tuner 2 and the DSP 6 that are heat sources are turned off in this way, the temperature of the apparatus can be quickly cooled. When the cooling device 26 is turned on, a considerable amount of power is consumed, but the tuner 2 and the DSP 6 are turned off, so that power consumption is saved correspondingly, and the battery operable time is short even when operating with the internal power supply. Never become.

  Since the user may not know the cause of the disappearance of the display, a reception waiting message is displayed in step S18 in order to inform the user that reception has been interrupted due to heat generation.

  In step S20, temperature data from the temperature sensor 32 is acquired. In step S22, it is determined whether or not the temperature has fallen below a predetermined temperature. If the temperature has not fallen below the predetermined temperature, the processing from step S20 is repeatedly executed. If the temperature falls below the predetermined temperature, reception is resumed in step S24. That is, the power of the tuner 2 and the DSP 6 is turned on via the power control device 24 and the power of the cooling device 26 is turned off via the power control device 24.

  Then, it returns to step S12 and said operation | movement is repeated.

  As described above, according to the first embodiment, the operation of the heat source is limited (power is turned off) at the time of overheating, the cooling device is turned on, and the cooling device is forcibly cooled. Can be cooled. In addition, since the device parts other than the heat source are energized, functions such as display related to still images are effective.

  FIG. 3 is a block diagram of a broadcast receiving apparatus according to the second embodiment of the present invention. In the following description of the embodiment, the same parts as those of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. The second embodiment is different from the first embodiment only in that the power supply control device 24 controls the battery (internal power supply) 40 and supplies the power of the battery 40 to the cooling device 26. When the temperature data from the temperature sensor 32 exceeds a predetermined temperature, not only the tuner 2 and the DSP 6 but also all the parts including the CPU 16 are turned off, and only the cooling device 26 is energized by the battery 40 and forced. Cooling. In the second embodiment, when the temperature of the apparatus rises, only the cooling device 26 is turned on and all others are turned off, so that the cooling efficiency is improved. In this embodiment, since it cannot be detected that the temperature has dropped, if the switch is turned on when the temperature has not dropped sufficiently, a temperature abnormality is detected and the power is turned off again. Alternatively, the power is turned on with function restriction, and the cooling device is operated.

  FIG. 4 is a block diagram of a broadcast receiving apparatus according to the third embodiment of the present invention. In the third embodiment, a battery (internal power supply) 44 and an AC power supply (external power supply) 46 are connected to the power supply control device 24, and an AC power supply connection detection device 48 is connected to the CPU 16 through the system bus 30. This is different from the first embodiment.

  FIG. 5 is a flowchart of the CPU 16 for explaining the operation of the third embodiment. Unlike the flowchart of FIG. 2, when it is determined in step S14 that the temperature is equal to or higher than the predetermined temperature, it is determined in step S42 whether or not AC power connection is detected, and only when AC power connection is detected. In step S16, the cooling device 26 is turned on, and the tuner 2 and the DSP 6 are turned off. Thereafter, the process proceeds to step S18. When the connection of the AC power source is not detected, that is, when the battery is driven, the tuner 2 and the DSP 6 are turned off in step S44 to prevent the battery from being consumed, but the cooling device 26 is not turned on. After step S44, the process proceeds to step S18, and the operation is the same as that of the first embodiment.

  According to the third embodiment, when the temperature of the cooling device 26 with high power consumption exceeds a predetermined temperature, the cooling device 26 is turned on only when the AC power source is driven, so that the battery operable time during battery driving is shortened. Absent.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the above embodiments. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine the component covering different embodiment suitably. In the above description, the reception is automatically resumed when the temperature is lowered. However, the actual resumption may be performed after the user turns on the power by merely displaying the reception resumable message. A specific example of the apparatus is not limited to a mobile broadcast receiving terminal, but can be applied to all portable electronic devices.

The block diagram which shows the structure of the 1st Embodiment of this invention. The flowchart which shows operation | movement of 1st Embodiment. The block diagram which shows the structure of the 2nd Embodiment of this invention. The block diagram which shows the structure of the 3rd Embodiment of this invention. The flowchart which shows operation | movement of 3rd Embodiment.

Explanation of symbols

  2 ... tuner, 4 ... transport stream data separator, 6 ... DSP, 8 ... graphic controller, 10 ... display device, 14 ... audio output device, 16 ... CPU, 18 ... internal storage device, 22 ... external storage device, 24 ... power supply control device, 26 ... cooling device, 32 ... temperature sensor.

Claims (8)

A tuner for receiving a broadcast wave including a digital broadcast wave and still image data ;
A digital signal processor for processing broadcast data output from the tuner;
Recording means for recording the still image data;
Cooling means;
An overheat preventing means that has a temperature sensor and stops operation of the tuner when the temperature above a predetermined temperature is detected, operates the cooling means, and stops operation of the digital signal processor ;
Means for reproducing still image data read from the recording means even when the tuner and the digital signal processor are stopped;
A broadcast receiving apparatus comprising: An external power supply,
An internal power supply,
A tuner that receives broadcast waves;
Cooling means;
When it has a temperature sensor and operates with an external power supply, it detects the temperature above a predetermined temperature, stops the tuner operation, operates the cooling means, and operates with an internal power supply. When a temperature equal to or higher than the temperature is detected, the tuner is stopped, but the overheating prevention means that does not operate the cooling means;
A broadcast receiving apparatus comprising: The broadcast wave includes a digital broadcast wave,
A digital signal processor for processing broadcast data output from the tuner;
3. The broadcast receiving apparatus according to claim 2 , wherein when the overheat prevention means detects a temperature equal to or higher than a predetermined temperature, the digital signal processor is also stopped. The broadcast wave includes still image data,
Recording means for recording the still image data;
Means for reproducing still image data read from the recording means even when the tuner and the digital signal processor are stopped;
The broadcast receiving device according to claim 3, further comprising: A central processing unit,
The broadcast receiving apparatus according to claim 2, wherein when the overheat control unit detects a temperature equal to or higher than a predetermined temperature, the central processing unit is also stopped and the cooling unit is operated by an internal power source. In a cooling method for a broadcast receiving apparatus , comprising: a tuner that receives broadcast waves including still image data; a recording unit that records the still image data; and a cooling unit.
Measuring the temperature,
When the temperature is equal to or higher than a predetermined temperature, the operation of the tuner is stopped, and the cooling means is operated .
Playing back still image data read from the recording means even when the tuner is stopped,
A cooling method comprising : In a cooling method for a broadcast receiving apparatus comprising an external power supply, an internal power supply, a tuner for receiving broadcast waves, and a cooling means,
Measure the temperature,
When operating with an external power source, if the temperature is above a predetermined temperature, stop the tuner, operate the cooling means, and when operating with an internal power source, if the temperature is above a predetermined temperature, A cooling method in which the operation of the tuner is stopped but the cooling means is not operated. In the cooling method, the broadcast wave includes still image data, and the still image data is recorded in a recording unit .
The cooling method according to claim 7 , wherein the still image data read from the recording unit is reproduced even when the tuner is stopped.

Images