JP2006311399A - Television receiver, and regulating method of rotating speed of cooling fan thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a television receiver that brings the sound noise of its cooling fan to a state not much felt uneasy by decreasing the rotating speed of the cooling fan when the television receiver displays a category of a program to which the sound noise of the cooling fan is obtrusive. <P>SOLUTION: The television receiver 1 including: a tuner 3; a selector 4; a demodulation circuit 5; a liquid crystal display unit 7; an audio processing circuit 10; a sound volume control circuit 11; a speaker 12; a microcomputer 13; a backlight adjustment circuit 14; a storage means 15; a temperature detection means 16; a user operation signal input section 18; and the cooling fan 19, to which an antenna 12 is connected, and operated by a remote controller 17, separates a CM broadcast from a program broadcast and detects the CM broadcast, increases the rotating speed of the cooling fan when detecting the CM broadcast, and decreases the rotating speed of the cooling fan during broadcasting of the main program so as to bring the noise of the cooling fan to a state not much felt uneasy. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a television receiver, and more particularly to a television receiver capable of effectively reducing noise of a cooling fan and cooling the television receiver.

  A conventional television receiver includes a cooling fan inside the apparatus, and heat generated inside the apparatus is released to the outside by the cooling fan to prevent overheating and protect elements inside the apparatus. However, although the cooling fan is necessary for cooling the television receiver, noise is also generated at the same time.

  In general, many fan motors are driven at a constant rotational speed. However, a cooling fan has a property that noise is reduced when the rotation speed is low. Therefore, in order to reduce noise, there has been proposed one that controls the rotational speed of the fan motor in accordance with the sound volume. For example, Japanese Patent Application Laid-Open No. 2003-33078 (Patent Document 1) and Japanese Patent Application Laid-Open No. 2004-233463 (Patent Document 2) propose ones that control the rotational speed of a fan motor in proportion to the sound output. Japanese Patent Laid-Open No. 2003-224990 (Patent Document 3) and Japanese Patent Laid-Open No. 2004-120268 (Patent Document 4) propose ones that control the rotational speed of a fan motor in accordance with the set amount of a volume control means. Yes.

According to the above-mentioned prior art, when the sound is loud, the noise of the cooling fan is often not concerned, so the cooling fan is set to the normal rotation speed, and when the sound is small, the noise of the cooling fan is often concerned. Low noise can be achieved at low speed.
JP 2003-33078 A JP 2004-233463 A JP 2003-224990 A JP 2004-120268 A

  By the way, in a television receiver, in the case of private broadcasting, a CM is usually inserted in the middle of a received program. In general, even when the volume is the same, the noise of the cooling fan is relatively worrisome while watching a program, and is often not worrisome during CM.

  In the above prior art, the noise of the cooling fan is reduced depending on the volume, but since it does not take into account that the degree of noise anxiety differs depending on the broadcast contents, the CM (which is relatively unacceptable for noise) Even in commercial broadcasting, there is a problem that the cooling capacity is lowered by lowering the rotation speed of the cooling fan when the volume is low. Further, since the temperature rise inside the television receiver is not necessarily proportional to the sound output, the rotation of the cooling fan cannot be sufficiently reduced, and noise may not be suppressed.

  An object of the present invention is to provide a television receiver that controls the rotational speed of a cooling fan according to the degree of concern about the noise of a program in view of the above-mentioned problems of the prior art, so that the noise of the cooling fan does not matter. is there. Another object of the present invention is to effectively cool a television receiver and to save power.

The gist of the invention according to claim 1 of the present invention is that a television receiver that receives broadcast radio waves and reproduces video and audio of a broadcast program detects a cooling fan that cools the inside and that a CM broadcast is received. The television receiver includes a CM detection unit and an adjustment unit that adjusts the rotation speed of the cooling fan according to the detection result of the CM detection unit.
According to a second aspect of the present invention, there is provided a temperature detecting means for detecting an internal temperature, wherein the adjusting means is in accordance with a detection result of the CM detecting means and a detection result of the temperature detecting means. The television receiver according to claim 1, wherein a rotation speed of the cooling fan is adjusted.
According to a third aspect of the present invention, there is provided a volume detection means for detecting a volume setting state, wherein the adjustment means includes a detection result of the CM detection means, a detection result of the temperature detection means, and 3. The television receiver according to claim 2, wherein a rotation speed of the cooling fan is adjusted according to a detection result of the sound volume detection means.
The gist of the invention according to claim 4 of the present invention is that the adjusting means lowers the rotation speed of the cooling fan than usual when the volume setting detected by the volume detecting means is smaller than a predetermined volume setting. The present invention resides in a television receiver according to claim 3.
The gist of the invention according to claim 5 of the present invention is characterized in that the adjusting means lowers the rotational speed of the cooling fan than usual when the temperature detected by the temperature detecting means is lower than a predetermined temperature. It exists in the television receiver as described in any one of Claim 2 thru | or 4.
The gist of the invention according to claim 6 of the present invention is that the adjusting means reduces the rotation speed of the cooling fan below normal when the CM detecting means does not detect CM broadcast. It exists in the television receiver as described in any one of Claims 1 thru | or 5.
The gist of the invention according to claim 7 of the present invention is that the adjusting means increases the rotational speed of the cooling fan more than usual when the CM detecting means detects a CM broadcast. It exists in the television receiver as described in any one of Claim 5 thru | or 5.
According to an eighth aspect of the present invention, there is provided a storage means for storing the rotation setting speed of the cooling fan in correspondence with a program broadcast and a CM broadcast, and the adjusting means is configured to detect a CM by the CM detection means. 8. The system according to claim 1, wherein when a broadcast is detected, the cooling fan is set to a rotation setting speed corresponding to the CM broadcast stored in the storage unit. It exists in the television receiver of description.
The gist of the invention according to claim 9 of the present invention is that, when the CM detection means does not detect a CM broadcast, the adjusting means sets the cooling fan to a rotation setting corresponding to the program broadcast stored in the storage means. The speed is set, and the television receiver according to any one of claims 1 to 6 exists.
According to a tenth aspect of the present invention, there is provided a liquid crystal display device capable of adjusting the brightness of a backlight, and the adjusting means is configured to adjust the brightness of the backlight when the CM detecting means detects a CM broadcast. The television receiver according to any one of claims 1 to 9, wherein the height is adjusted to be darker than usual.
According to an eleventh aspect of the present invention, there is provided a television receiver for receiving broadcast radio waves and reproducing video and audio of a broadcast program, a cooling fan for cooling the inside, and temperature detection for detecting the internal temperature. Means, a CM detection means for detecting that a CM broadcast has been received, and a volume detection means for detecting a volume setting state, the detection result of the temperature detection means, the detection result of the CM detection means, and the volume The present invention resides in a television receiver having adjusting means for adjusting the rotation speed of the cooling fan according to the detection result of the detecting means.
According to a twelfth aspect of the present invention, there is provided a liquid crystal display device capable of adjusting the brightness of a backlight, wherein the adjusting means detects the temperature high range, and the CM detecting means The television receiver according to claim 11, wherein when detecting no CM, the brightness of the backlight is adjusted to be dark when the volume detection means detects a low volume.
According to a thirteenth aspect of the present invention, there is provided a cooling fan rotation speed adjustment method for a television receiver having a cooling fan that receives broadcast radio waves and reproduces video and audio of a broadcast program. The rotation speed is stored in advance corresponding to the program broadcast and the CM broadcast, and when the CM broadcast is detected, the rotation speed of the cooling fan is set to the rotation speed stored in advance corresponding to the CM broadcast, and the CM broadcast is detected. If not, the present invention resides in a method for adjusting the cooling fan rotation speed of the television receiver, wherein the rotation speed is set in advance corresponding to the program broadcast.

  According to the present invention, the rotation speed of the cooling fan can be reduced during a program broadcast in which the noise of the cooling fan is relatively worrisome. Therefore, there is an effect that it is possible to provide a television receiver that is not concerned about the noise of the cooling fan. .

  Further, according to the present invention, the cooling fan rotation speed is increased during CM broadcasting to increase the cooling capacity, and during program broadcasting, the cooling fan rotation speed is decreased to average the cooling fan cooling capacity. It is possible to prevent overheating of the apparatus even if the rotation speed of the cooling fan is lowered during program broadcasting.

  In addition, according to the present invention, since the rotation speed of the cooling fan and the brightness of the backlight of the liquid crystal display device are optimally adjusted according to the viewing state and the temperature state, power consumption can be reduced and power saving can be realized. is there.

Next, the best mode for carrying out the present invention will be specifically described with reference to the drawings.
FIG. 1 is a configuration diagram of a specific television receiver in the first embodiment of the present invention.

  In FIG. 1, reference numeral 1 denotes a television receiver that receives and reproduces a broadcast program. The entire television receiver 1 is controlled by a microcontroller (hereinafter referred to as a microcomputer) 13.

  2 is an antenna for receiving broadcast radio waves, and 3 is a tuner for selecting a desired channel and outputting the signal. The tuner 3 includes a terrestrial digital broadcast tuner, a BS digital broadcast tuner, a CS digital broadcast tuner, and the like. The tuner 3 selects and receives a program desired by the user in accordance with an instruction from the microcomputer 13.

  Reference numeral 4 denotes a selector which switches and outputs signals output from a terrestrial digital broadcast tuner, a BS digital broadcast tuner, a CS digital broadcast tuner, and the like. The selector 4 selects one of an output signal of the terrestrial digital broadcast tuner, an output signal of the BS digital broadcast tuner, and an output signal of the CS digital broadcast tuner according to a switching instruction of the microcomputer 13. Further, an external device such as a DVD or a video device may be connected to the selector 4 so that these signals can be selected.

  Reference numeral 18 denotes a user operation signal input unit, which includes a remote control reception unit that receives infrared signals from a remote controller (hereinafter referred to as a remote controller) 17 that remotely operates the television receiver 1. The television receiver 1 sends an operation signal of the remote controller 17 input from the user operation signal input unit 18 to the microcomputer 13 that controls the entire television receiver 1, and the microcomputer 13 that receives this signal performs various operations such as channel switching and program reservation. Perform menu operations.

  Note that the antenna 2 and the tuner 3 are simply illustrated as the antenna 2 and the tuner 3 even when a plurality of different ones are required for terrestrial digital broadcasting, BS digital broadcasting, and CS digital broadcasting.

The digital video signal output from the selector 4 is input to the demodulation circuit 5, and the received signal is demodulated here. The demodulation circuit 5 includes an EPG decoder and CM detection means.
EPG (electronic program guide) information received from broadcast radio waves is decoded into EPG data by this EPG decoder and stored in the storage means 15 via the microcomputer 13. The EPG data includes data such as broadcast program start time, broadcast program end time, program genre, program sub-genre, viewer age restriction information, search keyword information, and program character names.

  The CM detection means detects that the CM is received when the CM is received, and outputs a detection signal to the microcomputer 13. In order to detect a CM, the audio mode described in JP-A-3-262287, JP-A-10-65988, JP-A-2002-77770, etc. can be selected from the mono broadcast mode or the bilingual broadcast mode. This method can be implemented by a method of detecting that the stereo broadcast mode has been entered. The CM is not limited to this, and it is detected whether or not there is a silence period of about 0.5 seconds in the audio data proposed in JP 2002-247516 A, JP 2000-115712 A, etc. And a method for detecting that a CM is received, and a method for detecting a CM by detecting that a CM code described in JP-A-2002-044689 is received. it can.

  In addition, the storage unit 15 stores data for setting the rotational speed of the cooling fan 19 to be adjusted, content (program, CM), volume (large, small), content (program, CM), volume (large, small). Data for setting the brightness of the backlight (B / L) to be adjusted, which is classified by (small), is stored. The storage unit 15 includes a RAM, a ROM, a rewritable ROM, and the like.

  The digital video signal output from the demodulation circuit 5 is input to the video processing circuit 6. The video processing circuit 6 has a processor that generates interlaced and progressive conversion and R (red), G (green), and B (blue) signals. The digital video signal output from the video processing circuit 6 is input to the liquid crystal display device 7, and a selected broadcast program or the like is displayed on the screen. The liquid crystal display device 7 includes a liquid crystal unit (LCD) 8 and a backlight (B / L) 9 whose brightness can be adjusted.

  The audio signal output from the demodulation circuit 5 is input to the audio processing circuit 10, and the volume of the audio signal is adjusted by the volume control circuit 11 provided on the output side. The output of the volume control circuit 11 is input to the speaker 12 and output as voice or sound. Further, a detection signal corresponding to the sound volume is output from the sound volume detection means provided in the sound volume control circuit 11 to the microcomputer 13. The sound volume detection by the sound volume detection means may be performed by detecting the sound signal level, detecting the rotational position of the sound volume, or detecting the pressed state of the sound volume selection button.

  In addition, the television receiver 1 of the present embodiment includes a temperature detection unit 16 that detects the temperature inside the television receiver 1, a cooling fan 19 that cools the television receiver 1, and a backlight (B / L) of the liquid crystal display device 7. ) A backlight adjustment circuit 14 for adjusting the brightness of 9 is connected to the microcomputer 13. The backlight adjustment circuit 14 is composed of an inverter or the like, and adjusts the brightness of the backlight (B / L) 9 according to a command from the microcomputer 13.

  2 to 4 show the rotation speed of the cooling fan 19 and the brightness of the backlight (B / L) 9 according to the present embodiment, the temperature (low range, mid range, high range), content (program, CM), And a look-up table showing how to control according to the volume (large, small). Note that the low, middle, and high ranges of temperature are arbitrarily set according to the operating temperature range of the television receiver 1. For example, the operating temperature range may be divided into three equal parts.

  Referring to the lookup table LUT1 in FIG. 2, the lookup table LUT1 shows a case where the temperature is low. In FIG. 2, the rotation speed of the cooling fan 19 is controlled to stop regardless of the content and volume. In FIG. 2, the brightness of the backlight (B / L) 9 is controlled to be normal during program broadcast and darker than normal during CM broadcast (the downward arrow is darker than normal). Means to do).

Referring to the lookup table LUT2 in FIG. 3, the lookup table LUT2 shows a case where the temperature is in the middle range. In FIG. 3, the rotation speed of the cooling fan 19 is controlled so that the rotation speed of the cooling fan 19 becomes high when the content is “CM”. When the content is “program” and the volume is “high”, the rotation speed of the cooling fan 19 is controlled to be lower than usual. When the content is “program” and the volume is “low”, the rotation speed of the cooling fan 19 is controlled to be further lower than the low speed (a downward arrow means that the rotation speed is further reduced from the low speed). .
In FIG. 3, the brightness of the backlight (B / L) 9 is controlled to be darker than usual during the CM broadcast, and the brightness of the backlight (B / L) 9 is normal during the program broadcast. Controlled to be bright.

Referring to the lookup table LUT3 in FIG. 4, the lookup table LUT3 shows a case where the temperature is high. In FIG. 4, when the content is “CM” and the volume is “low”, the rotation speed of the cooling fan 19 is controlled to be high. Further, when the content is “CM” and the volume is “high”, the rotation speed of the cooling fan 19 is further increased from the high speed state (the upward arrow indicates that the rotation speed is further increased within the allowable value from the high speed state. Meaning). Further, when the content is “program” and the volume is “high”, the rotation speed of the cooling fan 19 is controlled to be a normal speed. When the content is “program” and the volume is “low”, the rotation speed of the cooling fan 19 is decelerated from the normal speed (the downward arrow means that the rotation speed is lower than the normal speed). ).
In FIG. 4, the brightness of the backlight (B / L) 9 is controlled to be darker than usual during the CM broadcast. Further, when the content is “program” and the volume is “high”, the brightness of the backlight (B / L) 9 is controlled to be a normal brightness. When the content is “program” and the volume is “low”, the brightness of the backlight (B / L) 9 is controlled to be darker than usual.
The rotation speed setting values of “low speed” and “high speed” in the lookup tables LUT1 to LUT3 are selected so that the cooling capacity of the cooling fan 19 can be ensured on average.

According to the control of the present embodiment shown in FIGS. 2 to 4, the rotation of the cooling fan 19 is stopped when the detected temperature is low, and the content is “program” when the detected temperature is medium and high. When the sound volume is “low”, the rotation speed of the cooling fan 19 is controlled to be reduced, so that noise can be reduced during program broadcasting, and at the same time, power consumption can be reduced and power saving can be realized.
Also, when the detected temperature is high, the content is “program”, the volume is “low”, and during CM broadcast, the brightness of the backlight (B / L) 9 is dimmed to reduce power consumption. As a result, it is possible to prevent the temperature of the television receiver 1 from rising, and at the same time, it is possible to reduce the power consumption of the backlight (B / L) 9 and to further save power.
In addition, when the detected temperature is high, the content is “CM”, and the volume is “high”, the rotation speed of the cooling fan 19 is controlled to be higher than the high speed. The cooling capacity of the fan 19 can be improved, and the temperature rise of the television receiver 1 can be prevented.

  Incidentally, in order to show a comparison with the present invention, when an example of a conventional control method is shown, control is not performed according to the program and CM broadcast as shown in FIGS. When the detected temperature is in a low range, as shown in FIG. 6, in the conventional technology, the rotation of the cooling fan is stopped and the brightness of the backlight (B / L) 9 is in a normal state. When the detected temperature shown in FIG. 7 is in the middle or high range, in the conventional technology, the rotation speed of the cooling fan 19 is reduced below the normal even during CM broadcast where noise is not an issue. The cooling capacity has been reduced. Therefore, there is a problem that the temperature of the television receiver 1 tends to increase. Moreover, since the brightness of the backlight (B / L) 9 is not controlled when the rotation speed of the cooling fan 19 decreases and the cooling capacity decreases, there is a problem that the temperature is further increased compared to the present embodiment. is there.

  On the other hand, according to the present embodiment, since the rotation speed of the cooling fan 19 can be reduced during the program broadcast in which the noise of the cooling fan is relatively worrisome, the noise of the cooling fan 19 does not matter. In addition, the cooling speed of the cooling fan 19 can be increased by increasing the rotational speed of the cooling fan 19 during the CM broadcast, and the cooling speed of the cooling fan 19 can be reduced during the broadcast of the program. Even if the rotation speed of the cooling fan 19 is lowered during the program broadcast, the television receiver 1 can be prevented from overheating. In addition, since the rotation speed of the cooling fan 19 and the brightness of the backlight (B / L) 9 of the liquid crystal display device 7 are optimally adjusted according to the viewing state and the temperature state, power consumption is reduced and power saving can be realized. .

Next, the operation flow of this embodiment will be described with reference to FIG.
First, program viewing is started in step S1.
Next, the microcomputer 13 reads and checks the output state of the CM detection means provided in the demodulation circuit 5 to determine whether or not the received signal is a CM in step S2.

  When CM is detected in step S2 (YES), the process proceeds to step S3, where the microcomputer 13 reads the output from the volume detection means provided in the volume control circuit 11 and acquires volume information.

  Next, it progresses to step S4 and the microcomputer 13 reads the output from the temperature detection means 16 which detects the temperature inside the television receiver 1 and acquires temperature information.

  Next, the process proceeds to step S5, and on the basis of the signal corresponding to the volume from the volume control circuit 11 and the detected temperature information from the temperature detecting means 16, the lookup tables LUT1 to LUT3 shown in FIGS. Refer to the CM column.

  Next, the process proceeds to step S6, and the corresponding cooling fan rotation speed and backlight brightness setting data stored in the storage means 15 are selected and determined based on the result of referring to the lookup tables LUT1 to LUT3.

  Next, the process proceeds to step S7, and the microcomputer 13 sets the cooling fan rotation speed setting data and the backlight brightness setting data, which are selected and determined, by the microcomputer 13 as the rotation speed setting register and the backlight adjustment circuit. 14 is set in the backlight brightness setting register, and the rotation speed of the cooling fan 19 and the brightness of the backlight (B / L) 9 are controlled.

  When no CM is detected in step S2 (NO), the process proceeds to step S8, where the microcomputer 13 reads the output from the volume detection means provided in the volume control circuit 11, and acquires volume information.

  Next, it progresses to step S9 and the microcomputer 13 reads the output from the temperature detection means 16 which detects the temperature inside the television receiver 1 and acquires temperature information.

  Next, the process proceeds to step S10, where the lookup tables LUT1 to LUT3 shown in FIGS. 2 to 4 are based on the signal corresponding to the volume from the volume control circuit 11 and the detected temperature information from the temperature detection means 16. Refer to the program column.

  Next, the process proceeds to step S11, and the corresponding cooling fan rotation speed and backlight brightness setting data stored in the storage means 15 are selected and determined based on the result of referring to the lookup tables LUT1 to LUT3.

  Next, the process proceeds to step S12, where the microcomputer 13 sets the cooling fan rotation speed setting data and the backlight brightness setting data, which are selected and determined, by the microcomputer 13, the rotation speed setting register of the cooling fan 19, and the backlight adjustment circuit. 14 is set in the backlight brightness setting register, and the rotation speed of the cooling fan 19 and the brightness of the backlight (B / L) 9 are controlled.

As described above, according to the present embodiment, it is possible to reduce the rotation speed of the cooling fan during a program broadcast in which the cooling fan noise is relatively worrisome. There is an effect that can be done.
In addition, according to the present embodiment, during the CM broadcast, the cooling fan rotation speed is increased to increase the cooling capacity, and during the program broadcast, the cooling fan rotation speed is decreased to reduce the cooling fan cooling capacity. It can be secured on average, and has the effect of preventing overheating of the device even if the rotational speed of the cooling fan is lowered during program broadcasting.
In addition, according to the present embodiment, the rotation speed of the cooling fan and the brightness of the backlight of the liquid crystal display device are optimally adjusted according to the viewing state and the temperature state, so that power consumption is reduced and power saving can be realized. effective.

(Other embodiments)
As described above, the present invention has been described with reference to specific embodiments. However, the present invention is characterized in that the rotation speed of the cooling fan is adjusted depending on whether the program broadcast or the CM broadcast is being performed. The form of is also conceivable.

(1) Only the rotation speed of the cooling fan 19 can be adjusted without adjusting the brightness of the backlight 9 depending on whether the program broadcast or the CM broadcast is in progress. In the operation flow of FIG. 5 at this time, only the cooling fan 19 is controlled in steps S5 to S7 and S10 to S12. In this case, the present invention can be applied not only to the liquid crystal display device 7 but also to the one using a CRT or a plasma display as the video display unit of the television receiver 1.

(2) Further, the rotation speed of the cooling fan 19 or both the rotation speed of the cooling fan 19 and the brightness of the backlight 9 are not dependent on the volume data from the volume control circuit 11 depending on whether the program broadcast or the CM broadcast is being performed. Can also be adjusted. In this case, steps S3 and S8 in the operation flow of FIG. 5 are omitted, and the look-up table referred to in steps S5 and S10 includes the rotation speed of the cooling fan 19 or the rotation speed of the cooling fan 19 instead of the LUT1 to LUT3. What is necessary is just to use the look-up table which divided both the brightness of the backlight 9 only by the content (program, CM).

(3) Further, the rotation speed of the cooling fan 19 or both the rotation speed of the cooling fan 19 and the brightness of the backlight 9 can be adjusted depending on the content of the program without depending on the temperature. In this case, steps S4 and S9 in the operation flow of FIG. 5 are omitted, and the look-up table referred to in steps S5 and S10 may use one kind of temperature, for example, the look-up table LUT3 shown in FIG.

It goes without saying that the look-up table mentioned in the above embodiment is merely an example, and an appropriately modified table can be used.
Further, in the above embodiment, the volume detection is performed by detecting the volume signal level by the volume detection means of the volume control circuit 11, but instead of this, a method in which the volume output from the speaker is detected by a microphone is also used. Can be implemented.
Moreover, it cannot be overemphasized that it can change suitably and can implement in the range which does not change not only the said embodiment but the summary of this invention.

  INDUSTRIAL APPLICABILITY The present invention can be widely used for noise reduction of a receiving apparatus that receives and reproduces broadcast radio waves in which CMs are inserted into a program that is originally intended for viewing.

It is a block diagram of the television receiver in embodiment of this invention. It is a figure which shows the look-up table which refers to the cooling fan rotation in the temperature low region, and the brightness of a backlight in embodiment of this invention. It is a figure which shows the look-up table which refers to the cooling fan rotation in the temperature middle range, and the brightness of a backlight in embodiment of this invention. It is a figure which shows the look-up table which refers to the cooling fan rotation in the temperature high region and the brightness of a backlight in embodiment of this invention. It is a control flowchart explaining operation | movement of embodiment of this invention. It is a figure which shows the control method of a temperature low region by a prior art. It is a figure which shows the control method of a temperature mid range and a high region by a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Television receiver 2 ... Antenna 3 ... Tuner 4 ... Selector 5 ... Demodulation circuit 6 ... Video processing circuit 7 ... Liquid crystal display device 8 ... Liquid crystal part (LCD) )
9 ... Backlight (B / L)
DESCRIPTION OF SYMBOLS 10 ... Audio processing circuit 11 ... Volume control circuit 12 ... Speaker 13 ... Microcomputer (microcontroller)
14 ... Backlight adjustment circuit 15 ... Storage means 16 ... Temperature detection means 17 ... Remote control (remote controller)
18 ... User operation signal input unit 19 ... Cooling fan

Claims (13)

In a television receiver that receives broadcast radio waves and plays back video and audio of broadcast programs,
A cooling fan that cools the interior,
CM detection means for detecting that a CM broadcast is received;
A television image receiving apparatus comprising adjusting means for adjusting a rotational speed of the cooling fan in accordance with a detection result of the CM detecting means. Equipped with temperature detection means for detecting the internal temperature,
2. The television receiver according to claim 1, wherein the adjusting unit adjusts the rotation speed of the cooling fan in accordance with a detection result of the CM detection unit and a detection result of the temperature detection unit. Volume detection means for detecting the state of volume setting is provided,
The adjustment unit adjusts the rotation speed of the cooling fan according to a detection result of the CM detection unit, a detection result of the temperature detection unit, and a detection result of the volume detection unit. The television receiver of description.   4. The television receiver according to claim 3, wherein the adjusting unit reduces the rotation speed of the cooling fan from a normal level when a volume setting detected by the volume detecting unit is smaller than a predetermined volume setting. 5.   5. The television according to claim 2, wherein the adjusting unit reduces the rotation speed of the cooling fan from a normal speed when a temperature detected by the temperature detecting unit is lower than a predetermined temperature. 6. Image receiving device.   The said adjustment means reduces the rotational speed of the said cooling fan below normal when the said CM detection means is not detecting CM broadcast, The Claim 1 thru | or 5 characterized by the above-mentioned. TV receiver.   6. The television receiver according to claim 1, wherein the adjusting unit increases a rotation speed of the cooling fan from a normal level when the CM detecting unit detects a CM broadcast. 7. . Storage means for storing the rotation setting speed of the cooling fan corresponding to program broadcast and CM broadcast;
2. The adjusting device according to claim 1, wherein when the CM detection unit detects a CM broadcast, the adjusting unit sets the cooling fan to a rotation setting speed corresponding to the CM broadcast stored in the storage unit. Item 8. The television receiver according to any one of Items 5 and 7.   The said adjustment means sets the said cooling fan to the rotation setting speed corresponding to the said program broadcast memorize | stored in the said memory | storage means, when CM broadcast is not detected by the said CM detection means. The television receiver according to claim 6. Equipped with a liquid crystal display device that can adjust the brightness of the backlight,
The said adjustment means adjusts so that the brightness of the said backlight may become darker than usual, when the said CM detection means detects CM broadcast. TV receiver. In a television receiver that receives broadcast radio waves and plays back video and audio of broadcast programs,
A cooling fan that cools the interior,
Temperature detection means for detecting the internal temperature;
CM detection means for detecting that a CM broadcast is received;
Volume detection means for detecting the state of volume setting is provided,
A television receiver, comprising: an adjusting unit that adjusts a rotation speed of the cooling fan in accordance with a detection result of the temperature detection unit, a detection result of the CM detection unit, and a detection result of the volume detection unit. Equipped with a liquid crystal display device that can adjust the brightness of the backlight,
The adjusting means is arranged such that when the temperature detecting means detects a high temperature range, the CM detecting means does not detect CM, and the sound volume detecting means detects that the sound volume is low, the brightness of the backlight becomes dark. The television receiver according to claim 11, wherein the television receiver is adjusted. In a cooling fan rotation speed adjustment method for a television receiver having a cooling fan that receives broadcast radio waves and reproduces video and audio of a broadcast program,
The rotation speed of the cooling fan is stored in advance corresponding to program broadcast and CM broadcast,
When a CM broadcast is detected, the rotation speed of the cooling fan is set to a pre-stored rotation speed corresponding to the CM broadcast, and when a CM broadcast is not detected, a rotation speed stored in advance corresponding to the program broadcast is set. A method for adjusting a cooling fan rotation speed of a television receiver.

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