JP2005283645A - Video audio output device equipped with plasma display panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a video audio output device, equipped with a plasma display panel for lessening noise due to a cooling fan, when a sound volume of the video audio output device is small. <P>SOLUTION: The video audio output device, equipped with the plasma display panel, comprises the cooling fan for cooling the temperature of the inside of a device body, a temperature detector for detecting the temperature of the inside of the device body, an input means for inputting a sound volume value for regulating the sound volume of an output sound volume, the sound volume value input by the input means, and a control means for controlling the rotational speed of the cooling fan, on the basis of the detection temperature of the temperature detector. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a video / audio output device including a plasma display panel (PDP).

  In a video / audio output device such as a television receiver equipped with a PDP, the temperature inside the device main body tends to rise due to heat generated by the PDP or the like. Therefore, the audio / video output apparatus provided with the PDP is provided with a cooling fan in order to prevent the temperature inside the apparatus body from rising. As the number of rotations of the cooling fan increases, the cooling effect increases, but noise such as rotation noise and wind noise increases.

  Conventionally, the rotation speed of the cooling fan is controlled according to the temperature inside the apparatus regardless of the volume of the output sound of the video / audio output apparatus. For this reason, there has been a problem for the user that the noise from the cooling fan is a concern when the volume of the output audio of the video / audio output device is low.

  It is an object of the present invention to provide a video / audio output device including a plasma display panel that can reduce noise caused by a cooling fan when the volume of output audio from the video / audio output device is low.

  The invention described in claim 1 inputs a cooling fan for cooling the temperature inside the apparatus main body, a temperature detector for detecting the temperature inside the apparatus main body, and a volume volume value for adjusting the volume of output sound. And a control means for controlling the number of revolutions of the cooling fan based on the volume value input by the input means and the temperature detected by the temperature detector. .

  According to a second aspect of the present invention, in the first aspect of the present invention, the control means is configured such that the controller inputs the sound volume input by the input means so that the number of rotations of the cooling fan increases as the detected temperature of the temperature detector increases. The number of rotations of the cooling fan is controlled so that the number of rotations of the cooling fan becomes lower as the volume value is lower.

  According to the present invention, it is possible to reduce the noise caused by the cooling fan when the volume of the output audio of the video / audio output device is low.

  DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention applied to a television receiver equipped with a PDP will be described below with reference to the drawings.

  FIG. 1 shows a configuration of a cooling fan control circuit provided in a television receiver equipped with a PDP.

  The cooling fan 1 is driven by a fan driving unit 2. The fan drive unit 2 is controlled by a control unit 10 such as a microcomputer that controls the entire television receiver. An audio signal is sent to the speaker 11 via the gain amplifier 12. The gain of the gain amplifier 12 is controlled by the control unit 10. A temperature detector 3 provided in the main body of the television receiver is connected to the control unit 10. Further, the volume volume value is input to the control unit 10 from the volume control unit (input means such as a remote controller) 13.

  The control unit 10 adjusts the gain of the gain amplifier 12 based on the volume volume value from the volume adjustment unit 13. That is, the gain of the gain amplifier 12 is increased as the volume volume value from the volume controller 13 is increased. Therefore, the volume increases as the volume volume value from the volume controller 13 increases.

  Further, the control unit 10 controls the fan driving unit 2 based on the sound volume value from the sound volume adjusting unit 13 and the temperature detected by the temperature detector 3. Specifically, the control unit 10 divides the volume volume value into a plurality of stages, and maintains a control table that stores the relationship between the temperature and the fan drive voltage (fan rotation speed) for each stage of the volume volume value. ing. Then, the control unit 10 controls the driving voltage of the cooling fan 1 based on the volume level value from the volume adjustment unit 13, the detected temperature of the temperature detector 3, and the control table.

  FIG. 2 is a graph showing the contents of the control table.

  In this example, the volume level value is divided into four stages of 0 to 16, 17 to 32, 33 to 48, 49 to 64. Basically, the control table is created so that the number of rotations (drive voltage) of the cooling fan 1 increases as the detected temperature of the temperature detector 3 increases at each stage of the volume level. In addition, the control table is created so that the rotation speed (drive voltage) of the cooling fan 1 becomes lower as the volume volume value becomes smaller.

  The relationship between the detected temperature and the fan rotation speed (drive voltage) for each stage of the volume level is as follows.

(1) First stage (volume volume value: 0 to 16)
When the detected temperature is represented by T and the rotation speed of the cooling fan 1 is represented by R, the relationship between T and R is as follows in the first stage of the volume level.
(A) if T <Ta, then R = 0
(B) if Ta ≦ T <Tb, then R = Ra
(C) if Tb ≦ T <Tc, then R = Rb
(D) if Tc ≦ T <Td, then R = Rc
(E) if T ≧ Td, then R = Rd

(2) Second stage (volume volume value: 17 to 32)
(A) if T <Ta, then R = 0
(B) if Ta ≦ T <Tb, then R = Rb
(C) if Tb ≦ T <Tc, then R = Rc
(D) if Tc ≦ T <Td, then R = Rd
(E) if T ≧ Td, then R = Re

(3) Third stage (volume volume value: 33-48)
(A) if T <Ta, then R = 0
(B) if Ta ≦ T <Tb, then R = Rc
(C) if Tb ≦ T <Tc, then R = Rd
(D) if Tc ≦ T <Td, then R = Re
(E) if T ≧ Td, then R = Rf

(4) Fourth stage (volume volume value: 49-64)
(A) if T <Ta, then R = 0
(B) if Ta ≦ T <Tb, then R = Rd
(C) if Tb ≦ T <Tc, then R = Re
(D) if Tc ≦ T <Td, then R = Rf
(E) if T ≧ Td, then R = Rg

  For example, when the detected temperature is Ta or more and Tb or less, if the volume level is the first stage, the fan speed is Ra, and if the volume level is the second stage, the fan speed is Rb and the volume level. Is the third stage, the fan speed is Rc, and if the volume level is the fourth stage, the fan speed is Rd. Therefore, even if the detected temperature is the same, the fan rotational speed is small when the volume level is low.

  Note that the relationship among the sound volume value, the detected temperature, and the fan rotation speed (drive voltage) may be determined as shown in FIG. In FIG. 3, the relationship between the detected temperature and the fan rotation speed (drive voltage) for each stage of the volume level is as follows.

(1) First stage (volume volume value: 0 to 16)
When the detected temperature is represented by T and the rotation speed of the cooling fan 1 is represented by R, the relationship between T and R is as follows in the first stage of the volume level.
(A) if T <Ta, then R = 0
(B) if Ta ≦ T <Tb, then R = Ra
(C) if Tb ≦ T <Tc, then R = Rb
(D) if Tc ≦ T <Td, then R = Rc
(E) if T ≧ Td, then R = Rd

(2) Second stage (volume volume value: 17 to 32)
(A) if T <Ta, then R = 0
(B) if Ta ≦ T <Tb, then R = Rb
(C) if Tb ≦ T <Tc, then R = Rc
(D) if T ≧ Tc, then R = Rd

(3) Third stage (volume volume value: 33-48)
(A) if T <Ta, then R = 0
(B) if Ta ≦ T <Tb, then R = Rc
(C) if T ≧ Tb, then R = Rd

(4) Fourth stage (volume volume value: 49-64)
(A) if T <Ta, then R = 0
(B) if T ≧ Ta, then R = Rd

  In FIG. 3, the temperature at which the fan rotation speed reaches the maximum setting speed is set lower as the volume volume value is larger.

It is a block diagram which shows the structure of the cooling fan control circuit provided in the television receiver provided with PDP. It is a graph which shows an example of the relationship between detected temperature and fan rotation speed (drive voltage) for each step of the volume level. It is a graph which shows the other example of the relationship between detected temperature and fan rotation speed (drive voltage) for each step | level of a sound volume value.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cooling fan 2 Fan drive part 3 Temperature detector 10 Control part 11 Speaker 12 Gain amplifier 13 Volume control part

Claims (2)

A cooling fan for cooling the temperature inside the device,
A temperature detector for detecting the temperature inside the device body,
Controls the number of rotations of the cooling fan based on the input means for inputting the volume value for adjusting the volume of the output sound and the volume value input by the input means and the temperature detected by the temperature detector. Control means for
A video / audio output device including a plasma display panel. The control means is configured so that the higher the temperature detected by the temperature detector, the higher the rotational speed of the cooling fan, and the lower the volume volume value input by the input means, the lower the rotational speed of the cooling fan. The video / audio output device having a plasma display panel according to claim 1, wherein the number of rotations is controlled.

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