JP2005303747A - Electronic apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic apparatus for reducing fan noise without consuming wasteful power by controlling to generate sound with an inverted phase to a phase of the fan noise when a fan is driven and no sound is outputted. <P>SOLUTION: The electronic apparatus provided with: the fan 15 for cooling the inside of the main body; a reception section 2 for receiving a broadcast signal including a sound signal; a sound output means 8 for outputting sound on the basis of the sound signal or outputting prescribed sound; and a sound collection unit 16 for collecting the fan noise from the fan 15, is characterized in to include: the silencing signal generating section 62 for generating a silencing signal with the same frequency as that of the fan noise; and a phase adjustment section 63 for allowing the silencing signal generating section 62 to output the silencing signal with the inverted phase to the phase of the fan noise, and the phase adjustment section 63 controls the silencing signal generating section 62 to generate the silencing signal with the inverted phase to the phase of the fan noise when a sound output from the sound output means 8 is silent and the sound collection unit 16 detects the fan noise of a prescribed level or over. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an electronic device represented by a television receiver or the like.

In recent years, there has been proposed an apparatus for reducing fan noise generated by driving a fan in an electronic apparatus having a fan for cooling the inside of the apparatus main body. For example, in order to reduce fan noise of a notebook personal computer, a fan noise reduction device that reduces fan noise by generating a sound having an opposite phase and the same amplitude as the fan noise is known (Patent Document 1).
Japanese Patent Laid-Open No. 10-268872

However, the fan noise reduction device described in Patent Document 1 is configured to always operate when the notebook personal computer is driven. Therefore, for example, even when sound is output from the speaker of a notebook computer and the fan noise is not bothering, the fan noise reduction device is operating, so that useless power is consumed. there were.
The present invention has been made in view of such problems. When the fan is driven and there is no audio output, control is performed to generate a sound having a phase opposite to that of the fan noise. It is an object of the present invention to provide an electronic device that reduces fan noise without consuming it.

The electronic device apparatus according to the present invention includes a fan for cooling the inside of the main body, a receiving means for receiving a broadcast signal including an audio signal, an audio output means for outputting a sound based on the audio signal or a predetermined sound, and the fan And a sound collecting means for collecting fan noise generated when the fan is driven, wherein the muffler signal generating means generates a mute signal having the same frequency as the fan noise generated by driving the fan. And a phase adjusting means for outputting the mute signal in an anti-phase relationship with respect to the phase of the fan noise generated by driving the fan, and at the same time the sound output from the sound output means is silent. When the sound collecting means detects fan noise of a predetermined level or higher, the mute signal is generated while maintaining a phase relationship opposite to the phase of the fan noise. And performing control to.
The electronic apparatus according to the present invention further includes display means for displaying the image based on the image signal, wherein the broadcast signal includes an image signal in addition to the audio signal, and the received broadcast signal is the display means. Or an operation means having an operation key for operating the sound output means as desired by the user, and when a predetermined key is pressed on the operation means, a silent state And the control is performed so that the mute signal is generated while maintaining a reverse phase relationship with respect to the phase of the fan noise for a certain period of time or more after the pressing operation.
In the electronic device device according to the present invention, the operation key of the operation means is any one of a volume increment key, a mute key, a channel switching key, and an input switching key.
Further, the electronic device apparatus according to the present invention includes a recording unit for recording the broadcast signal received by the receiving unit on a recording medium, and when the recording operation is being performed by the recording unit or the electronic device When the apparatus is in a standby state, it is determined that the apparatus is in a silent state, and control is performed so that the mute signal is generated while maintaining an antiphase relationship with the phase of the fan noise.

The present invention relates to an electronic device that reduces fan noise without consuming wasteful power by controlling to generate sound having a phase opposite to that of fan noise when the fan is driven and there is no audio output. Can be provided.
Further, according to the present invention, it is possible to prevent the user from hearing the sound of the fan that can be heard by the user when the user performs a specific operation.

  Next, the contents of the present invention will be described in detail, but the present invention is not limited to these embodiments.

  FIG. 1 is a block diagram of a main part of an electronic device apparatus according to an embodiment of the present invention. The electronic device apparatus according to the present invention includes an antenna 1 that receives a broadcast signal, a receiver 2 that detects a broadcast signal received through the antenna 1 and outputs an image signal and an audio signal, and an image / audio information from outside the broadcast signal. To select one of the external information input unit 3 composed of an external input terminal and an external memory slot for inputting a broadcast signal, and a broadcast signal and image / audio information from the external information input unit 3 The switching unit 4, the image processing unit 5 that performs signal processing on the image signal from the switching unit 4, the audio processing unit 6 that performs signal processing on the audio signal from the switching unit 4, and the image signal-processed by the image processing unit 5 are displayed. Display unit 7, audio output means 8 such as a speaker that outputs sound signal-processed by the audio processing unit 6, central control unit (microcomputer) 9 that performs each control of the electronic device, and storage unit that stores various setting values Consisting of 0, and the like.

  When processing such an image signal or audio signal, a predetermined control process (for example, CH switching, input switching, volume adjustment, etc.) is performed in the central control unit 9 by the user's set value control. The operation means for the user to operate such control processing includes, for example, an operation unit 11 capable of key operation, or a predetermined control signal generated by a key operation of the remote operation unit 12 and the remote operation unit 12 such as a remote control. The light receiving part 13 etc. which receive light are comprised. Various setting values set by these operating means are stored in the storage unit 10, whereby the output state of image or audio information can be held.

  Further, when the user performs setting value control on these image signals or audio signals, the control signal is generated by an input operation of a key (for example, a menu key) of an operation unit such as the operation unit 11 or the remote operation unit 12. By being issued, the central control unit 9 calls various character or symbol patterns for displaying the OSD menu items stored in the storage unit 10 or the like, and as a result, the image information displayed on the screen is, for example, partially Is displayed in a state where it is overwritten or can be viewed on a semi-transparent screen. As a result, the user can operate while recognizing the result of the changed setting value by viewing the image information on the screen.

  For example, the display unit 7 can provide a display element that does not require depth by adopting a thin display element such as a liquid crystal display element, a plasma light emitting element, or an organic EL element. For example, in the case of a liquid crystal panel, vertical and horizontal drivers for performing processing such as storage and analog conversion on the image signal of each picture element sent as a digital value from the image processing unit 5, TFT elements, liquid crystal It is mainly equipped with picture elements composed of layers, color filters, polarizing plates, etc., and the gradation display of each picture element is accurately controlled and displayed according to the applied voltage sent from the horizontal driver. The output voltage is applied to an accurate line by line selection by a control signal from the vertical driver.

  In addition, since display elements, such as a liquid crystal panel, are non-self-light-emitting materials, it is necessary to provide an illuminating member in the vicinity of a liquid crystal panel, for example, it is equipped with the drive device for driving a backlight and the light source in the inside. . With such an illuminating member, each gradation image controlled and output by the liquid crystal panel can be displayed.

Next, a characteristic configuration of the present invention will be described.
The electronic device device includes a fan 15 for cooling the inside of the main body, a motor 14 for driving the fan 15, and a sound collector 16 for collecting fan noise generated by driving the fan 15. The fan noise collected by the sound collector 16 is converted into an electric signal and input to the central controller 9. On the other hand, the audio processing unit 6 includes a decoder 61 that expands the audio signal from the switching unit 4, a mute signal generator 62 that generates a mute signal for generating sound that acts to cancel fan noise, and the phase of the mute signal. It is comprised from the phase adjustment part 63 which adjusts. The mute signal generator 62 generates a mute signal having the same amplitude and frequency as the fan noise under the control of the central control unit 9 based on the amplitude and frequency of the electric signal of the fan noise output from the sound collector 16. To do. The phase adjustment unit 63 adjusts the phase of the mute signal so as to be opposite to the phase of the fan noise based on the phase of the electric signal of the fan noise under the control of the central control unit 9 and supplies it to the audio output unit 8. To do. In this way, fan noise generated from the fan 15 is canceled and reduced by the sound based on the mute signal generated by the mute signal generator 62 and the phase adjuster 63.

In addition, since the sound output means based on the mute signal uses the sound output means 8 of the electronic device, it contributes to the reduction of the number of parts and the miniaturization. Of course, a speaker or the like may be provided separately from the sound output means 8 to output sound based on the mute signal.
Further, the means for detecting fan noise is not limited to the sound collector 16, and for example, a vibration sensor for detecting vibration of the fan 15 may be provided and detected.

  By the way, when the fan 15 is driven, there are a state where there is a sound output from the sound output means 8 and a state where there is no sound output. Conventionally, when the fan 15 is driven, the mute signal is always generated. However, when the sound is output, the fan noise does not matter.

  As a feature of the present invention, when the fan 15 is driven and there is no audio output from the audio output means 8, a mute signal is generated as the mute means, and there is an audio output. By controlling so as not to generate a mute signal, wasteful power consumption can be suppressed and fan noise can be reliably reduced.

Hereinafter, a specific example in the case where there is no sound output from the sound output means 8 when the fan 15 is driven will be described.
One is a case where a silence state for a certain period occurs due to a user operation or the like.
The operation means such as the operation unit 11 or the remote operation unit 12 is configured such that a volume adjustment operation can be performed by an adjustment key for volume adjustment (for example, a volume increment key, a mute key, etc.). Therefore, when the operation means is operated to reduce the volume to zero while the fan 15 is driven, there is no sound output from the sound output means 8. In addition to various adjustment keys for volume adjustment, for example, from when the channel switch key or input switch key is pressed until a predetermined image is displayed after this operation, for example, large-capacity images such as scaling processing and digital broadcasting A certain time (several seconds) may be required for reasons such as a longer decoding process. During this time, the audio signal of the broadcast signal is usually not output, and on the other hand, the fan may continue to be driven. .
Therefore, when the mute key, volume increment key, channel selection key, channel increment key, or input switch key of the operation means of the operation unit 11 or the remote operation unit 12 is operated, until the operation result is output. During the above-described period, a silencer for silencing the sound output from the fan may be made to function.

  An example of the control of the mute signal at such time will be described based on the flowchart of FIG. First, it is determined whether or not the fan 15 is being driven (S1). If the fan 15 is not being driven, a state in which the silencing signal generation unit 62 stops generating the silencing signal is maintained (S4). When the fan 15 is driven, the central control unit 9 determines whether or not an operation for reducing the volume by the operating means is performed (S2). In the state where the sound volume is not zero and the sound is output, the fan noise does not matter due to the sound output even if the sound output signal is not generated. Therefore, the sound output signal generation unit 62 stops the sound generation signal generation. It is maintained (S4). When the volume is zero, the fan noise is recognized as an unpleasant sound, so the mute signal generator 62 and the phase adjuster 63 are controlled by the central controller 9 to generate a mute signal (S3). Therefore, the fan noise is canceled and reduced by the sound based on the mute signal. When the drive of the fan 15 is stopped (S1) or the volume is not zero (S2) in the state where the mute signal is generated, the central control unit 9 controls to stop the generation of the mute signal. . As described above, the sound output is controlled based on the sound volume adjustment operation of the operation means, and the mute signal is controlled, so that wasteful power consumption can be suppressed and fan noise can be surely reduced. it can.

  In the flowchart of FIG. 2, the generation of the mute signal is controlled based on whether the volume is zero or not, but the present invention is not limited to this. For example, even if the volume is not zero, there may be a case where the volume is low and noise is concerned. In such a case, a volume at which noise is not a concern is stored in advance in the storage unit 10 or the like, and when a volume adjustment operation is performed below the volume, control may be performed to generate a mute signal. it can. With such a configuration, noise can be more reliably reduced.

Another specific example of the case where there is no audio output from the audio output means 8 when the fan 15 is driven is a case where the audio signal included in the broadcast signal or the like is in a silent state.
That is, even when data such as a broadcast signal or image / audio information is input from the receiving unit 2 or the external information input unit 3 and an image is displayed on the display unit 7, the audio signal of the input data is silent. In this case, there is no audio output from the audio output means 8. In such a case, for example, when the decoder 61 detects that the audio signal is at the silence level, the detection signal is output to the central control unit 9, thereby outputting a predetermined sound from the mute signal generating unit 62. To control. At that time, the central control unit 9 detects the phase of the sound from the sound collector 16 that collects the sound of the fan, whereby the phase adjustment control of the phase adjustment unit 63 is performed.

  The control of the mute signal in this case will be described based on the flowchart of FIG. First, it is determined whether or not the fan 15 is being driven (S11). If the fan 15 is not being driven, a state where the silencing signal generation unit 62 stops generating the silencing signal is maintained (S14). When the fan 15 is driving, the state of the audio signal included in the input data is determined by the central control unit 9 (S12). That is, the decoder 61 or the like detects whether or not the audio signal is a silence level, and the detection result is output to the central control unit 9 to determine whether or not the audio output is present. For example, if the silence level state continues for a preset time, it is determined that there is no audio output. The predetermined time can be set as a time during which noise is recognized as an unpleasant sound. If the audio signal is not at the silence level, the fan noise is not anxious due to the audio output even if the mute signal is not generated, so that the mute signal generation unit 62 maintains the mute signal generation stopped state (S14). . Since the fan noise is recognized as an unpleasant sound when the audio signal is in a silent level, the mute signal generator 62 and the phase adjuster 63 are controlled by the central controller 9 to generate a mute signal. (S13). Therefore, the fan noise is canceled and reduced by the sound based on the mute signal. When the drive of the fan 15 is stopped in a state where the mute signal is generated (S11) or when the silence level is not reached (S12), the central control unit 9 controls to stop the generation of the mute signal. In this way, the presence or absence of audio output is determined based on whether or not the audio signal included in the data is at the silence level, and the mute signal is controlled, so that wasteful power consumption is suppressed and fan noise is ensured. Can be reduced.

Further, another specific example in the case where there is no sound output from the sound output means 8 when the fan 15 is driven will be described.
In FIG. 1, the electronic device apparatus includes a recording unit 17 that records data such as broadcast signals and video / audio information input to the receiving unit 2 and the external information input unit 3. The recording unit 17 can also perform scheduled recording by designating a broadcast channel, a broadcasting time, etc., and the recording unit 17 and the reserved recording operation are performed by operating means such as the operation unit 11 and the remote operation unit 12. Can do. The recording operation of the recording unit 17 can be performed while displaying and outputting the image and sound of the input data, or is performed with the electronic device set in a standby state, for example, when performing scheduled recording at midnight. You can also. Although the fan 15 is stopped in the standby state, when the recording operation is started by the recording unit 17 and data is input, the fan 15 is driven, and at that time, the image is displayed and the sound is output. Therefore, fan noise is recognized as unpleasant noise.

  In this case, that is, the control of the mute signal when the recording operation of the recording unit is performed in the standby state will be described with reference to FIG. In the standby state, the fan 15 is controlled to be driven while the recording operation of the recording unit 17 is being performed, and to be stopped when the recording operation is not being performed. First, the central control unit 9 determines whether or not recording by the recording unit 17 is being performed (S21). When recording is not performed, the mute signal generation unit 62 maintains the mute signal generation stopped state (S24). When recording is being performed, the central control unit 9 determines whether or not the electronic device is in a standby state (S22). In the state where the sound is output instead of the standby state, even if the mute signal is not generated, the fan noise does not matter due to the sound output, so the mute signal generation unit 62 maintains the state where the mute signal generation is stopped. (S24). Since the fan noise is recognized as an unpleasant sound in the standby state, the mute signal generator 62 and the phase adjuster 63 are controlled by the central controller 9 to generate a mute signal (S23). Therefore, the fan noise is canceled and reduced by the sound based on the mute signal. When data recording is completed in a state where the mute signal is generated (S21) or when the recording is lost in the standby state (S22), the central control unit 9 controls to stop the generation of the mute signal. In this way, the presence or absence of audio output is determined based on the standby state and the execution state of the recording operation, and the mute signal is controlled, so that wasteful power consumption is suppressed and fan noise is reliably reduced. Can do.

  Note that each control of the mute signal described with reference to FIGS. 2 to 4 and the like may be performed individually, but is preferably performed in combination. By doing so, it is possible to reduce fan noise with higher power efficiency and higher accuracy.

The block diagram of the electronic device apparatus concerning embodiment of this invention. The flowchart regarding control of the mute signal concerning an embodiment of the invention. The flowchart regarding the other control of the silence signal concerning embodiment of this invention. The flowchart regarding the other control of the silence signal concerning embodiment of this invention.

Explanation of symbols

1 Antenna 2 Receiver (Receiving means)
3 External information input unit 4 Switching unit 5 Image processing unit 6 Audio processing unit 61 Decoder 62 Silencing signal generating unit (silencing signal generating means)
63 Phase adjuster (phase adjuster)
7 Display section (display means)
8 Voice output means 9 Central control section 10 Storage section 11 Operation section (operation means)
12 Remote control unit (operation means)
13 Light-receiving part 14 Motor 15 Fan 16 Sound collector (sound collecting means)
17 Recording section (recording means)

Claims (4)

A fan for cooling the inside of the main body,
Receiving means for receiving a broadcast signal including an audio signal;
A voice output means for outputting a voice based on the voice signal or a predetermined sound;
An electronic device comprising: sound collecting means for collecting fan noise generated when the fan is driven;
Silencing signal generating means for generating a silencing signal of the same frequency with respect to fan noise generated by driving the fan;
Phase adjustment means for outputting the mute signal in an anti-phase relationship with respect to the phase of fan noise generated by driving the fan,
When the sound output from the sound output means is silent and at the same time fan noise of a predetermined level or higher is detected in the sound collection means, the mute signal maintains a reverse phase relationship with the phase of the fan noise. An electronic apparatus device that performs control so as to occur. The electronic device apparatus according to claim 1,
The broadcast signal includes an image signal in addition to the audio signal,
Display means for displaying an image based on the image signal;
The operation means having an operation key for operating the received broadcast signal to the display means or the sound output means as desired by the user,
When there is an operation of pressing a predetermined key on the operation means, it is determined that there is no sound, and the mute signal is maintained in an inverse phase relationship with the phase of the fan noise for a certain period or more after the operation. An electronic apparatus device characterized by performing control so as to occur. The electronic device apparatus according to claim 2,
The electronic device apparatus characterized in that the operation key of the operation means is any one of a volume increment key, a mute key, a channel switch key, and an input switch key. The electronic device apparatus according to claim 1,
The electronic device apparatus has a recording means for recording the broadcast signal received by the receiving means on a recording medium,
When the recording operation is being performed by the recording unit or when the electronic device is in a standby state, it is determined that the sound is silenced, and the mute signal maintains an inverse phase relationship to the phase of the fan noise. The electronic device is characterized in that control is performed so as to be generated.

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