JP4836924B2 - Electrical equipment, audio playback device, air cooling fan control method, computer program - Google Patents

Description

  In order to suppress noise of an air cooling fan, the present invention implements an electric device, an audio playback device, an air cooling fan control method, and an air cooling fan control method that increase or decrease the number of rotations of the fan according to the volume of audio data to be reproduced. Relating to computer programs.

An audio playback device that can suppress noise of an air cooling fan has been proposed (for example, Patent Document 1). The sound reproducing device is configured to suppress the noise of the air-cooling fan by increasing the rotation speed of the air-cooling fan when the volume setting value is large and by decreasing the rotation speed when the volume setting value is small. ing.
There has also been proposed an audio reproduction device that increases or decreases the number of rotations of an air cooling fan in accordance with the audio signal level.
JP 2004-120268 A

However, in the conventional audio reproduction device, if the internal temperature rises for a long time after the low volume period in which the number of rotations of the air cooling fan is decreased, the internal device is damaged even in the low volume period. In order to prevent this, it is necessary to rotate the air-cooling fan again at a high speed, and there is a problem that noise caused by the rotation of the air-cooling fan hinders viewing.
In addition, when the number of rotations of the air cooling fan is increased or decreased according to the audio signal level, the air cooling fan rotates at a high speed during a large volume period regardless of the duration of the small volume period, which causes a problem that noise is generated unnecessarily. .

  The present invention has been made in view of such circumstances. Based on the audio data, the low volume period and the high volume period are detected in advance, and the number of rotations of the air cooling fan in the high volume period is set after the high volume period. Increased / decreased according to the length / shortness of the low sound volume period, the noise of the air-cooling fan during the low sound volume period can be reduced and the temperature rise of the electric circuit can be effectively suppressed. An object of the present invention is to provide an air cooling fan control method and a computer program for executing the air cooling fan control method.

An electrical device according to the present invention is an electrical device including an air-cooling fan that cools an electrical circuit, and obtains audio data having at least information indicating the magnitude of audio to be reproduced by a speaker ; and Means for accumulating the acquired audio data; volume detection means for detecting a low volume period with a low volume and a high volume period with a high volume based on the stored audio data; and a high volume period detected by the volume detection means Fan control means for increasing / decreasing the number of rotations of the air cooling fan in accordance with the length / shortness of the low volume period after the high volume period.

An audio reproducing apparatus according to the present invention includes an air cooling fan for air-cooling an electric circuit, and reproducing means for reproducing audio data having at least information indicating the magnitude of audio to be reproduced by a speaker, and the air cooling fan is reproduced. Means for storing audio data having at least information indicating the magnitude of audio to be reproduced by a speaker in an audio reproduction apparatus configured to rotate at a higher speed as the volume of the audio data to be reproduced is larger, and the accumulated audio data Based on the above, the volume detection means for detecting the low volume period with a low volume and the high volume period with a high volume before the audio data is reproduced, and the rotation of the air cooling fan in the high volume period detected by the volume detection means Fan control means for increasing / decreasing the number in accordance with the length / shortness of the low volume period after the high volume period is provided.

  In the sound reproducing device according to the present invention, the fan control means includes a means for rotating the air cooling fan at a low speed during a low volume period, a means for rotating the air cooling fan at a medium speed or a high speed during a high volume period, and the volume detection. And determining means for determining the time length so that the time length of the period during which the air cooling fan is rotated at high speed is long / short according to the length / shortness of the low volume period detected by the means. .

In the sound reproducing device according to the present invention, the sound volume detecting means detects a high sound volume period, a medium sound volume period, and a low sound volume period based on the accumulated sound data, and rotates at high speed, medium speed, and low speed. Storage means for storing the temperature raising / lowering speed of the electric circuit at the time, and the determination means rotates the air cooling fan at high speed so as to satisfy | T _L × L | ≦ | T _M × M + T _H × H | The time length of the period is determined.

In the sound reproducing device according to the present invention, the sound volume detecting means detects a large sound volume period, a medium sound volume period, and a low sound volume period based on sound data, and the sound volume is detected at high speed, medium speed, and low speed rotation. Storage means for preliminarily storing the temperature increase / decrease speed of the electric circuit, the fan control means, the temperature increase / decrease speed stored in the storage means and the large volume period, medium volume period and small volume detected by the volume detection means Means for determining whether or not the temperature drop during the loud sound volume period is equal to or higher than the temperature rising during the low sound volume period based on the time period; and means for extending the time period during which the air-cooling fan is rotated at a high speed if determined to be not. It is characterized by providing.

  The sound reproducing device according to the present invention is characterized in that the predetermined temperature is higher than an equilibrium temperature of the electric circuit when the air cooling fan is rotated at a medium speed.

  The sound reproducing device according to the present invention is characterized in that the fan control means includes means for increasing / decreasing the number of rotations of the air-cooling fan in a low volume period.

In the air cooling fan control method according to the present invention, the number of rotations of the air cooling fan included in the audio reproducing device that reproduces audio data having at least information indicating the magnitude of the audio to be reproduced by the speaker is set according to the volume of the audio data to be reproduced. In the air-cooling fan control method for controlling the speed to be higher as the value is larger, the sound data having at least information indicating the magnitude of the sound to be reproduced by the speaker is accumulated, and the sound volume is small based on the accumulated sound data. A volume period and a large volume period with a large volume are detected before the audio data is reproduced, and the number of rotations of the air-cooling fan in the detected large volume period is set to the length of the small volume period after the large volume period / It is characterized by increasing / decreasing according to shortness.

A computer program according to the present invention is a computer program for causing a computer to calculate data for controlling the amount of operation of an air-cooling fan for air-cooling an electric circuit. In the computer program, information indicating the magnitude of sound to be reproduced by a speaker is displayed. Accumulate at least audio data, and cause the computer to detect a low volume period of low volume and a high volume period of high volume based on the accumulated audio data before the audio data is played back, Data for increasing / decreasing the amount of operation of the air-cooling fan in the set high volume period according to the length / shortness of the low volume period after the high volume period is calculated.

In the present invention, when the low sound volume period comes, the number of rotations of the air cooling fan is reduced as compared with other periods. Therefore, the noise of the air cooling fan during the low volume period can be suppressed.
However, the longer the low volume period during which the number of revolutions of the air cooling fan decreases, the higher the temperature rise of the electric circuit during the low volume period, which may exceed the operation guarantee temperature of the electric circuit.
In order to solve this problem, the volume detection means of the present invention detects the low volume period and the high volume period in advance based on the accumulated audio data, and the fan control means detects the length of the low volume period to be visited in the future. / Increase / decrease the number of rotations of the air cooling fan in the high volume period preceding the low volume period according to the short period. The increase / decrease in the number of rotations according to the length / shortness of the low volume period means that the longer the time length of the low volume period, the longer the control of rotating the air-cooling fan at a higher speed and the time of the low volume period. As the length is longer, it means one or both of the controls for increasing the rotation speed of the air cooling fan.
In this case, regardless of the length of the low volume period, the electric circuit can be sufficiently cooled in the high volume period preceding the low volume period, and the temperature rise of the electric circuit in the low volume period can be effectively suppressed. .
In addition, since the present invention is configured to increase the rotation speed of the air cooling fan in the high volume period in order to suppress the temperature rise of the electric circuit in the low volume period, the rotation number of the air cooling fan is increased in the low volume period. Compared to noise, noise is not a problem.
Furthermore, since the present invention is configured to increase / decrease the number of rotations of the air cooling fan in the high volume period according to the length / shortness of the low volume period, the rotation number of the air cooling fan does not increase unnecessarily. The noise of the air cooling fan can be effectively suppressed.
Note that the audio data acquired by the electrical device or the audio reproduction device includes not only audio data in a narrow sense but also audio data in a broad sense having at least information indicating the size of the audio to be reproduced. For example, an envelope detection signal obtained by envelope detection from a voice signal may be acquired as voice data. Further, audio data obtained by discretizing the envelope detection signal, for example, audio data indicating the volume with three values of high volume, medium volume, and low volume may be acquired.
Moreover, the electrical component described in the present invention is a superordinate concept of an air cooling fan, and means a member that generates noise by its operation.

In the present invention, the fan control means rotates the air-cooling fan at a low speed in a small volume period. Further, the fan control means controls the rotation of the air cooling fan so that the time length of the period for rotating the air cooling fan at a high speed becomes long / short according to the length / shortness of the low sound volume period, and the temperature in the low sound volume period. Suppress the rise.
By adjusting the time during which the air-cooling fan is rotated at a high speed, the temperature rise during the low volume period can be suppressed, so that the noise due to the rotation of the air-cooling fan can be suppressed to a certain amount.

In the present invention, the fan control means has the electric circuit drop temperature | T _M × M + T _H × H | in the large volume period in which the air-cooling fan rotates at high speed, while the electric circuit in the small volume period in which the air-cooling fan rotates at low speed. The time length of the period during which the air-cooling fan is rotated at a high speed is determined so as to be equal to or higher than the rising temperature | T _L × L |. In other words, the temperature rise of the low volume period can be compensated for by preliminarily estimating the rising temperature in the low volume period and lowering the temperature of the electric circuit by the increased temperature in the high volume period.

  In the present invention, the fan control means ends the low volume period based on the temperature increase / decrease speed stored in the storage means and the high volume period, medium volume period, and low volume period detected by the volume detection means. Calculate the temperature of the electrical circuit. And a fan control means determines the time length of the period which rotates an air-cooling fan at high speed so that the temperature of an electric circuit when a low sound volume period ends may become less than predetermined temperature.

In the present invention, the length of time for which the air cooling fan is rotated at a high speed is set so that the temperature of the electric circuit is equal to or lower than a predetermined temperature higher than the equilibrium temperature of the electric circuit when the air cooling fan is rotated at medium speed. decide.
Therefore, since the allowable temperature rise during the low volume period increases, the temperature drop to be lowered before the low volume period arrives is reduced, and the high-speed rotation period can be shortened.

  In the present invention, there is provided means for increasing / decreasing the number of rotations of the air cooling fan in the low volume period. Therefore, if the temperature rise cannot be compensated for by increasing the number of rotations of the air cooling fan in the high volume period, the temperature increase of the air cooling fan in the low volume period can be increased or decreased in an auxiliary manner. Therefore, the temperature rise of the electric circuit can be suppressed.

  ADVANTAGE OF THE INVENTION According to this invention, the noise of the air cooling fan in a low sound volume period can be reduced, and the temperature rise of an electric circuit can be suppressed effectively.

Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments thereof.
(Embodiment 1)
FIG. 1 is a block diagram showing the configuration of a disc playback apparatus as an audio playback apparatus according to an embodiment of the present invention. In the figure, reference numeral 11 denotes a control unit that controls the operation of various components of the disk reproducing apparatus and implements the air cooling fan control method according to the present invention. The control unit 11 is a microcomputer including, for example, a CPU (Central Processing Unit), a time measuring unit, and the like. The control unit 11 includes a reproduction unit 12, a decoder 13, a memory 14, a volume detection unit 15, and a video via a bus 20. An output unit 16, an audio output unit 17, an air cooling fan (electrical part) 18, and a temperature raising / lowering speed storage unit 19 are connected.

The playback unit 12 is an optical disk drive that reads data from a recording medium M such as a DVD (Digital Versatile Disc), a BD (Blu-ray), or an HD-DVD (High Definition-DVD). Hereinafter, a case where the recording medium M is a DVD will be described as an example. The optical disk is an example of the recording medium M, and may include other media that can record data. The reproduction unit 12 includes an optical pickup that reads data from the recording medium M, a demodulation unit that demodulates the read data, and the like. Data demodulated by the demodulation unit is supplied to the decoder 13.
Note that the DVD records data in the MPEG2PS format. MPEG2PS format data is composed of a plurality of packets. The packet is a packet obtained by compressing video data and audio data in chronological order constituting a video by a predetermined compression / decompression method.

  The decoder 13 includes a separation unit that separates a packet related to video data and a packet related to audio data from MPEG2PS format data, and a video decoder and an audio decoder. The video decoder decompresses the video data separated by the separation unit according to the MPEG2 compression / decompression method, and provides the decompressed video data to the memory 14. The audio decoder expands the audio data separated by the separation unit according to a predetermined compression / decompression method, for example, the compression / decompression method of AC3 (Audio Code number 3), and supplies the expanded audio data to the memory 14.

  The memory 14 is a nonvolatile memory such as DRAM or SRAM, and has a storage capacity capable of storing audio data corresponding to a predetermined reproduction time, for example, several seconds to several tens of seconds.

  The video output unit 16 and the audio output unit 17 DA convert the video data and audio data given from the memory 14 at a predetermined timing into analog video signals and audio signals, and externalize the DA converted video signals and audio signals. Are output to a display device and a speaker (not shown). The video and audio output timing is recorded in the video data and audio data, and the control unit 11 controls the output timing.

  The air cooling fan 18 is, for example, a square axial fan, and includes a brushless DC motor and a fan formed on the rotor of the brushless DC motor, and includes a control unit 11, a playback unit 12, and a decoder 13 that constitute a disk playback device. Various electric circuits such as these are cooled. The control unit 11, the reproduction unit 12, and the decoder 13 are examples of an electric circuit to be cooled, and may be configured to cool other circuits such as a power supply circuit.

  The sound volume detection unit 15 has a function of detecting a low sound volume period in which the reproduced sound volume is low, a medium sound volume period in which the sound volume is medium, and a high sound volume period in which the sound volume is high, based on the sound data stored in the memory 14. Yes. For example, the volume detection unit 15 discriminates a large volume, a medium volume, and a small volume based on an envelope detector that performs envelope detection of an audio signal waveform related to audio data, and an envelope detection signal waveform that has been envelope detected And a storage unit storing a medium sound volume threshold value and a large sound volume threshold value. The sound volume detection unit 15 compares the signal level of the envelope detection signal with the high sound volume threshold value, and determines that it is a high sound volume period when the signal level is equal to or higher than the high sound volume threshold value. Similarly, when the signal level of the envelope detection signal is less than the high sound volume threshold and equal to or higher than the medium sound volume threshold, the sound volume detection unit 15 determines that the medium sound volume period is in effect. Further, when the signal level of the envelope detection signal is less than the medium sound volume threshold, the large sound volume detection unit 15 determines that it is a low sound volume period. Then, the sound volume detection unit 15 gives the detection result to the control unit 11.

  The temperature raising / lowering speed storage unit 19 stores the temperature raising / lowering speeds of various electric circuits when the air cooling fan 18 rotates at high speed, medium speed, and low speed.

FIG. 2 is a graph conceptually showing the temperature raising / lowering speed. The horizontal axis indicates the time during which the air cooling fan 18 is continuously rotated, and the vertical axis indicates the temperature of the electric circuit. A straight line indicated by a solid line indicates a temperature change when the air cooling fan 18 is rotated at a high speed below a predetermined upper limit temperature. The predetermined upper limit temperature is a temperature determined within a range in which various electric circuits of the disk reproducing apparatus can operate normally. For example, the predetermined upper limit temperature is an equilibrium temperature of the electric circuit when the air cooling fan 18 is rotated at a medium speed. When the temperature raising / lowering speed of the electric circuit when the air cooling fan 18 is rotated at high speed is H, the time is T, the temperature is t, and the temperature when the time T = 0 is t0, the temperature change is t = t0 + H × Represented by T.
Similarly, a straight line indicated by a broken line indicates a temperature change when the air cooling fan 18 is rotated at a medium speed below a predetermined upper limit temperature, and the temperature change is represented by t = t0 + M × T. Moreover, the straight line shown with the dashed-dotted line has shown the temperature change at the time of rotating the air cooling fan 18 at low speed, and this temperature change is represented by t = t0 + LxT. However, M represents the temperature rise / fall speed of the electric circuit when the air cooling fan 18 is rotated at a medium speed, and L represents the temperature rise / fall speed of the electric circuit when the air cooling fan 18 is rotated at a low speed.

FIG. 3 is a timing chart showing the processing content of the rotation control of the air cooling fan 18.
FIG. 3A shows an audio signal obtained from audio data. The horizontal axis represents time, and the vertical axis represents the signal level of the audio signal.
FIG. 3B shows an envelope detection signal obtained by envelope detection of the audio signal shown in FIG. The signal level of the envelope detection signal corresponds to the volume of the audio data to be reproduced. In FIG. 3B, two horizontal lines indicated by broken lines indicate the high volume threshold and the medium volume threshold. When the signal level of the envelope detection signal is less than the medium volume threshold, it is determined as a low volume period, and when the signal level is equal to or higher than the medium volume threshold and less than the high volume threshold, it is determined as the medium volume period, and the signal level Is greater than or equal to the loudness threshold, it is determined that the loudness period.
FIG. 3C shows a volume signal indicating the high volume period, the medium volume period, and the low volume period detected by the volume detection unit 15. The signal level of the volume signal has three values: a high level, a medium level, and a low level. A high level indicates a large volume period, a medium level indicates a medium volume period, and a small level indicates a small volume period.
The disk reproducing apparatus according to the present invention is configured to rotate the air cooling fan 18 at a low speed in a small volume period in order to reduce the noise of the air cooling fan 18. However, when the air cooling fan 18 is rotated at a low speed for a long time, the temperature of the electric circuit may exceed the operation guarantee temperature of the electric circuit.
In view of this, the disk reproducing apparatus according to the present invention is configured so that the time for rotating the air-cooling fan 18 at a high speed during the high volume period and further rotating at a high speed is compensated for according to the length of the low volume period so as to compensate for the rising temperature during the low volume period. I am trying to make it.
FIG. 3D is a timing chart showing the temperature change of the electric circuit. As shown in FIG. 3 (d), the temperature of the electric circuit is lowered by increasing the number of revolutions of the air cooling fan 18 in the large volume period prior to the small volume period. Even when the temperature rises, the temperature of the electric circuit can be suppressed below the equilibrium temperature T _Ma that is the predetermined upper limit temperature.

4 and 5 are flowcharts showing a processing procedure of the control unit 11 related to the rotation control of the air cooling fan 18.
When receiving an instruction to start reproduction of audio data, the control unit 11 acquires audio data from the decoder 13 and accumulates the acquired data in the memory 14 (step S11). Next, the control unit 11 gives the audio data stored in the memory 14 to the volume detection unit 15 to detect a high volume period, a medium volume period, and a low volume period (step S12).

  And the control part 11 determines the presence or absence of a low volume period based on the detection result of the volume detection part 15 (step S13). When it is determined that there is no low volume period (step S13: NO), the control unit 11 performs a process described later related to the rotation of the air cooling fan 18. If it is determined that there is a low volume period (step S13: YES), the control unit 11 reads out the temperature increase / decrease speed at the time of high speed rotation, medium speed rotation, and low speed rotation from the temperature increase / decrease speed storage unit 19 (step S14).

  Next, the control unit 11 calculates the rising temperature in the low volume period based on the low volume period detected in step S12 and the temperature increase / decrease speed during low-speed rotation read in step S14 (step S15).

FIG. 6 is a timing chart showing the temperature change of the electric circuit. The horizontal axis represents time, and the vertical axis represents the temperature of the electric circuit. When the time length of the low volume period during which the air-cooling fan 18 is rotated at a low speed is T _L and the temperature raising / lowering speed at the low-speed rotation is L, the rising temperature t _L is expressed as | T _L × L |.

  Next, the control unit 11 performs initial setting of the high-speed rotation control period (step S16). For example, the control unit 11 sets 0 as the high-speed rotation control period. The high-speed rotation control period is a period from the start time of the low volume period to the time point of starting the process of increasing the rotation speed of the air cooling fan 18 prior to the low volume period.

And the control part 11 is a loud volume period in a high-speed rotation control period based on the medium volume period and loud volume period detected by step S12, and the temperature raising / lowering speed at the time of medium speed rotation and high speed rotation read by step S14. Then, the temperature drop during the medium volume period is calculated (step S17). Specifically, when the time length of the high volume period is T _Hi , the time length of the medium volume period is T _Mj , the temperature raising / lowering speed at high speed rotation is H, and the temperature raising / lowering speed at medium speed rotation is M, the high speed The temperature drop during the rotation control period is expressed as | ΣT _Hi × H + ΣT _Mj × M |. However, i is a natural number indicating each of a plurality of high volume periods, and j is a natural number indicating each of a plurality of medium volume periods.
More specifically, as shown in FIG. 6, when the high-speed rotation control period preceding the low-volume period includes two large volume periods and two medium volume periods, the temperature drop during the high-speed rotation control period is | T _H2 × H + T _M2 × M + T _H1 × H + T _M1 × M | In FIG. 6, t _H1 = T _H1 × H and t _H2 = T _H2 × H indicate the temperature drop during each loud volume period. Similarly, t _M2 = T _M2 × M and _M1 = T _M1 × M indicate the rising temperature in each medium volume period.

  When the process of step S17 is completed, the control unit 11 determines whether or not the temperature drop during the high speed rotation control period is equal to or higher than the temperature rise during the low volume period (step S18). If it is determined that the temperature drop is less than the temperature rise (step S18: NO), the controller 11 determines whether or not the high-speed rotation control period can be extended (step S19). For example, when the high-speed rotation control period has already been extended to the current time from the start point of the low volume period, the control unit 11 determines that the high-speed rotation control period cannot be extended. If it is determined that the high-speed rotation control period can be extended (step S19: YES), the control unit 11 extends the high-speed rotation control period (step S20), and returns the process to step S17.

  When it is determined that the high-speed rotation control period cannot be extended (step S19: NO), or when it is determined in step S18 that the temperature drop is equal to or higher than the rising temperature (step S18: YES), the control unit 11 performs steps S17 to S20. The high-speed rotation control period determined in the process is stored (step S21).

  When the process of step S21 is completed, the control unit 11 determines whether or not the current time is a low volume period (step S22). When it determines with it being a low volume period (step S22: YES), the control part 11 rotates the air cooling fan 18 at low speed (step S23), and complete | finishes a process.

  When it is determined that it is not the low volume period (step S22: NO), or when it is determined that there is no low volume period (step S13: NO) in step S13, the control unit 11 determines whether or not the current time is the medium volume period. Is determined (step S24). If it is determined that it is not the medium volume period (step S24: NO), the controller 11 determines whether or not it is the high speed rotation control period (step S25).

  When it is determined that it is not the high speed rotation control period (step S25: NO), or when it is determined that it is the medium volume period (step S24: YES), the control unit 11 rotates the air cooling fan 18 at medium speed (step S26). Finish the process.

  When it determines with it being a high speed rotation control period (step S25: YES), the control part 11 rotates the air cooling fan 18 at high speed (step S27), and complete | finishes a process.

In the disk reproducing apparatus and the air cooling fan control method configured as described above, as shown in FIG. 6, the rising temperature t _L = | T _L × L | during the low volume period is estimated in advance and the rising temperature is compensated. Therefore, the time length | ΣT _Hi × H + ΣT _Mj × M | required for the high-speed rotation control period can be calculated, and the air-cooling fan 18 can be rotated at high speed in a large volume period. Therefore, it is possible to reduce the noise of the air cooling fan 18 during the low volume period and to effectively suppress the temperature rise of the electric circuit.
Moreover, it is possible to prevent the rotation speed of the air cooling fan 18 from increasing unnecessarily, and to effectively suppress the noise of the air cooling fan.

  In the first embodiment described above, as shown in FIG. 4, the high-speed rotation control period is determined so that the rising temperature in the low volume period is equal to or higher than the falling temperature in the medium volume level and the high volume period. As long as the temperature of the electric circuit can be controlled to be equal to or lower than the predetermined upper limit temperature, the high speed rotation control period may be determined by another calculation method.

Hereinafter, a disc reproducing apparatus according to the first modification will be described. The disc reproducing apparatus according to the first modification controls the rotation of the air cooling fan 18 so that the temperature at the end of the low-speed rotation period is equal to or lower than a predetermined upper limit temperature. Specifically, a process described later may be executed instead of step S18. When the process of step S17 is finished, the control unit 11 calculates the temperature of the electric circuit at the end of the low volume period. The temperature at the end of the low volume period is represented by (t _Ma − | ΣT _Hi × H + ΣT _Mj × M | + | T _L × L |). Since the air-cooling fan 18 before the low volume period arrives is rotating at a medium speed, the temperature of the electric circuit is the equilibrium temperature _tMa . Therefore, by subtracting the drop temperature | ΣT _Hi × H + ΣT _Mj × M | in the subsequent large sound volume control period from the equilibrium temperature t _Ma and adding the rising temperature | T _L × L | The temperature of the electric circuit at the end time can be calculated.
When the temperature of the electric circuit at the end of the low volume period is lower than the predetermined upper limit temperature, the control unit 11 executes the process of step S21. When the temperature is equal to or higher than the predetermined upper limit temperature, the control unit 11 executes the process of step S19.
Even in the disc reproducing apparatus according to the first modification, it is possible to reduce the noise of the air cooling fan 18 during the low volume period and to effectively suppress the temperature rise of the electric circuit.

The predetermined upper limit temperature is preferably a value larger than the equilibrium temperature t _Ma when the air-cooling fan 18 is rotating at medium speed.
FIG. 7 is a timing chart showing a temperature change of the electric circuit according to the second modification. In FIG. 7, although the sound volume pattern is the same as that in FIG. 6, the predetermined upper limit temperature t _lim is a value larger than the equilibrium temperature t _Ma , so that the high-speed rotation of the air cooling fan 18 in the large sound volume period T _H2 can be omitted. is there.

  In the disc reproducing apparatus and the air cooling fan control method according to the second modified example, since the allowable temperature rise during the low volume period increases, the temperature drop to be lowered before the low volume period arrives decreases, and the high speed It becomes possible to shorten the rotation period.

  Further, in the above-described embodiment, the case where the temperature raising / lowering speed is linear with respect to the rotation time of the air-cooling fan 18 has been described. You may comprise so that the raise temperature in a low speed rotation period may be calculated.

FIG. 8 is a graph conceptually showing an example of the temperature raising / lowering speed according to the third modification. The horizontal axis indicates the time during which the air cooling fan 18 is continuously rotated, and the vertical axis indicates the temperature of the electric circuit. Similar to FIG. 2, the curve indicated by the solid line indicates the temperature change when the air-cooling fan 18 is rotated at a high speed when the electric circuit is at a predetermined temperature lower than the predetermined upper limit temperature. A curve indicated by a broken line indicates a temperature change when the air cooling fan 18 is rotated at a medium speed, and a curve indicated by an alternate long and short dash line indicates a temperature change when the air cooling fan 18 is rotated at a low speed. Yes.
Moreover, the temperature raising / lowering speed memory | storage part 19 has similarly memorize | stored the temperature change in case an electrical circuit is another predetermined temperature. When the temperature raising / lowering speed is nonlinear with respect to the rotation time, the rising temperature and the falling temperature of the electric circuit can be calculated by integrating the temperature raising / lowering speed with respect to the rotation time. Except for the method for calculating the rising temperature and the falling temperature, the processing procedure is the same as that shown in FIGS.

  In the disc reproducing apparatus and the air cooling fan control method according to the third modified example, the rising temperature and the falling temperature of the electric circuit can be estimated more accurately, so that the air cooling fan 18 in the low volume period is more effective. Noise and the temperature rise of the electric circuit can be suppressed.

  In the disk reproducing apparatus and the air cooling fan control method according to Embodiment 1 and Modifications 1 to 3, the rotation speed of the air cooling fan 18 is switched in three stages: high speed rotation, medium speed rotation, and low speed rotation. Although configured, it may be configured to control in multiple stages of four or more stages.

  Further, although the case where the rotation of the air cooling fan 18 mounted on the disk playback device is controlled has been described, the present invention may be applied to other audio playback devices and electrical devices including the air cooling fan 18 for air cooling the electric circuit. good.

(Embodiment 2)
The disc reproducing apparatus according to the second embodiment has the same configuration as that of the disc reproducing apparatus according to the first embodiment, and only the method for controlling the rotational speed of the air cooling fan 18 is different. Therefore, the difference will be mainly described below. To do.
In the first embodiment, when the high volume period preceding the low volume period is short or when the low volume period is long, the temperature drop during the high volume period is smaller than the temperature rise during the low volume period. In some cases, the temperature cannot be sufficiently compensated. In the disk reproducing apparatus according to the second embodiment, when the high volume period preceding the low volume period is short, the rotation speed of the air-cooling fan 18 in the low volume period is set to the medium / low speed rotation, that is, the rotation speed during the medium speed rotation and the low speed rotation. By increasing the rotational speed to an intermediate rotational speed, the temperature rise during the low volume period can be suppressed.

  FIGS. 9 and 10 are flowcharts showing the processing procedure of the control unit 11 related to the rotation control of the air cooling fan 18 in the second embodiment. The control part 11 performs the process of step S31-40 similar to step S11-20 shown in FIG. In step S39, the control unit 11 determines whether or not the high-speed rotation control period can be extended (step S39). When it is determined that the high-speed rotation control period cannot be extended (step S39: NO), the control unit 11 stores that temperature compensation is not possible (step S41), and the high-speed rotation determined in the processing of steps S37 to S40. The control period is stored (step S42).

  When the process of step S42 is completed, the control unit 11 determines whether or not the current time is a low volume period (step S43). When it determines with it being a low volume period (step S43: YES), the control part 11 determines whether temperature compensation is possible (step S44). Specifically, the control unit 11 determines whether or not temperature compensation is possible based on whether or not the fact that temperature compensation is impossible is stored. When it determines with temperature compensation being possible (step S44: YES), the control part 11 rotates the air cooling fan 18 at low speed (step S45), and complete | finishes a process. When it determines with temperature compensation being impossible (step S44: NO), the control part 11 rotates the air-cooling fan 18 in medium and low speed (step S46), and complete | finishes a process.

  If it is determined in step S43 that it is not a low volume period (step S43: NO), or if it is determined in step S33 that there is no low volume period (step S33: NO), the control unit 11 is in the middle volume period. Is determined (step S47). When it is determined that it is not the medium volume period (step S47: NO), the control unit 11 determines whether it is the high speed rotation control period (step S48).

  When it is determined that it is not the high speed rotation control period (step S48: NO), or when it is determined that it is the medium volume period (step S47: YES), the control unit 11 rotates the air cooling fan 18 at medium speed (step S50). Finish the process.

  When it determines with it being a high speed rotation control period (step S48: YES), the control part 11 rotates the air cooling fan 18 at high speed (step S49), and complete | finishes a process.

FIG. 11 is a timing chart showing a temperature change of the electric circuit according to the second embodiment. As in FIG. 6, the horizontal axis represents time, and the vertical axis represents the temperature of the electric circuit. In particular, in the figure, a straight line indicated by a one-dot chain line indicates a temperature change when the air cooling fan 18 is rotated at a low speed during a low volume period, and a straight line indicated by a two-dot chain line indicates that the air cooling fan 18 is a medium / low speed during a low volume period. The temperature change when rotating is shown. FIG. 11 shows a case where the low volume period is long and the high volume period is short compared to FIG. Specifically, the time length of the low volume period T _L shown in FIG. 11 is longer by T _LX than the low volume period T _L1 having the same time length as the low volume period shown in FIG. Further, in FIG. 11, there is no large volume period _TH2 shown in FIG.
When reproducing such audio data, when the air-cooling fan 18 is rotated at a low speed during a low volume period, the temperature of the electric circuit is set to a predetermined upper limit temperature t before the end of the low volume period T _{L as} indicated by a one-dot chain line. It will exceed _lim .
According to the second embodiment, when the temperature cannot be compensated only by the high speed rotation of the air cooling fan 18 in the large volume period _TH1, the rotation speed of the air cooling fan 18 in the small volume period _TL can be increased in step S46. As shown by a two-dot chain line, the temperature of the electric circuit can be suppressed within a predetermined upper limit temperature.

  Therefore, in the disc playback apparatus and the air cooling fan control method according to the second embodiment, even if the loud volume period preceding the low volume period is short or the small volume period is long, An increase in the temperature of the circuit can be effectively suppressed, and abnormal operation of the electric circuit can be prevented.

  Other configurations, operations, and effects of the disc playback apparatus according to the second embodiment are the same as the configurations, operations, and effects of the disc playback apparatus according to the first embodiment. Detailed description thereof will be omitted.

(Embodiment 3)
FIG. 12 is a block diagram showing the configuration of the disc playback apparatus according to Embodiment 3 of the present invention. The disc playback apparatus according to the third embodiment has the same configuration as the disc playback apparatus according to the first embodiment, and further outputs video data and audio data to be played back in the future to an external device such as the projector 3. An output unit 21 is provided.

  FIG. 13 is a block diagram showing a configuration of projector 3 according to Embodiment 3 of the present invention. In the figure, reference numeral 32 denotes a light source such as an ultra-high pressure mercury lamp or a metal halide lamp. The white light emitted from the light source 32 is reflected by the rotary parabolic reflecting mirror 33, passes through the color wheel 34, and enters the rod integrator 36.

  The color wheel 34 is provided with fan-shaped color filters that transmit red, green, and blue light in the circumferential direction, and is disposed so that the light projecting area of the light source 32 is positioned in the rotation pass area of the color filter. Yes.

  An output shaft of a motor 35 that is rotationally driven by a motor drive unit 41 is connected to the center of the color wheel 34, and the motor drive unit 41 rotates the motor 35 at a constant speed. The rotation of the motor 35 is controlled by a control unit 31 composed of a microcomputer.

  In addition, the control unit 31 includes a memory 44 for storing video data and audio data input via the output unit 21 and the input unit 43 of the disk playback device, an air cooling fan 42, and a temperature raising / lowering speed storage unit 45. It has been. Similar to the first embodiment, the temperature raising / lowering speed storage unit 45 stores the temperature raising / lowering speeds of various electric circuits when the air cooling fan 42 rotates at high speed, medium speed, and low speed. The electric circuit is, for example, the control unit 31, the motor driving unit 41, the light source 32, and the like. The control unit 31 detects the high volume period, the medium volume period, and the low volume period by executing the same processing as that of the disk playback device shown in FIGS. 4 and 5, and the detection result and temperature increase / decrease speed storage unit 45. Calculates the temperature rise of the electric circuit during the low volume period and the temperature drop during the high-speed rotation control period based on the temperature rise / fall speed stored in the The rotation of the air cooling fan 42 is controlled.

  When the color wheel 34 rotates at a constant speed, the white light sequentially enters the red, green, and blue color filters and is time-divided into red, green, and blue light in a time series. The color-time-divided light enters the entrance of the substantially rectangular rod integrator 36, and the incident light is repeatedly reflected on the inner surface of the rod integrator 36 to become uniform light, and enters the illumination lens group 37 from the exit. To do.

  The illumination lens group 37 includes, for example, a condenser lens and a relay lens, and causes white light to enter a light modulation element 38, for example, a DMD. The DMD includes a plurality of minute movable mirrors associated with each dot of an image related to image data. A DMD driving unit 40 is connected to the DMD, and the DMD driving unit 40 receives red, green, and blue light that has been color-time-divided based on the image data supplied from the control unit 31 to the projection lens 39. Alternatively, each minute movable mirror is selectively tilted ± 10 degrees so as to be selectively reflected out of the projection lens 39. The light that has entered the DMD is optically modulated by a small movable mirror of the DMD, and the modulated light that has undergone optical modulation enters the projection lens 39.

  The projection lens 39 projects modulated light, that is, light for enlarging and displaying an image onto the screen. As a result, the image related to the image data is displayed on the screen in color time division.

  In the disk reproducing apparatus and the air cooling fan control method according to the third embodiment, not only the disk reproducing apparatus that reproduces audio data but also the noise of the air cooling fan 42 of the projector 3 connected to the disk reproducing apparatus is suppressed at the same time. Can do.

  The projector 3 according to the third embodiment is configured to acquire audio data from a disk playback device of an external device and control the rotation of the air cooling fan 18 based on the audio data. The audio data obtained from the above need not be narrowly-defined audio data capable of reproducing complete audio, but may be data including at least information indicating the volume level. For example, the disc playback device may output the envelope detection signal shown in FIG. 3B and receive the projector 3. Also, as shown in FIG. 3C, the disk playback device outputs audio data including information on the high volume period, the medium volume period, and the low volume period, and the projector 3 receives the audio data in a broad sense, and the air cooling fan You may comprise so that rotation of 18 may be controlled.

  Other configurations, operations, and effects of the disc playback apparatus according to the third embodiment are the same as those of the disc playback apparatus according to the first embodiment. Detailed description thereof will be omitted.

(Embodiment 4)
FIG. 14 is a block diagram showing a configuration of the computer 5 according to Embodiment 4 of the present invention. The computer 5 according to the fourth embodiment includes a CPU 51 that controls the operation of various components of the computer 5 and performs the air-cooling fan control method according to the present invention. The CPU 51 includes a ROM 52, a bus 61, A RAM 53, a clock unit 54, an auxiliary storage device 55, a video output unit 56, an audio output unit 57, an air cooling fan 58, a storage device 59, a communication interface 60, and the like are connected.

The storage medium 6 shown in FIG. 14, such as a CD-ROM, DVD-ROM, or memory card, has a temperature increase / decrease speed and a medium volume threshold for realizing the functions of the disk reproducing device according to the first to third embodiments of the present invention. In addition, the loudness threshold value, the computer program 7 according to the present invention, and the like are recorded in the computer 5 so as to be readable.
The auxiliary storage device 55 reads the computer program 7 and various data recorded in the storage medium 6 from the storage medium 6 and stores the read computer program 7 and various data in the storage device 59.
The storage device 59 is, for example, a hard disk, and stores a computer program, audio data, and the like according to the present invention.
The computer 5 reads out the computer program 7 from the storage device 59 to the RAM 53 and executes it, thereby realizing the rotation control function of the air cooling fan 58 in the same manner as the disk reproducing device according to the first to third embodiments.
The computer program 7 reads at least the audio data stored in the storage device 59 and accumulates it in the RAM 53. Based on the audio data accumulated in the RAM 53, the computer program 7 detects the high volume period, the medium volume period, and the low volume period. And a program for causing the computer 5 to execute a process of increasing / decreasing the rotation speed of the air cooling fan 58 in the detected large volume period according to the length / shortness of the small volume period after the large volume period. Yes.
The computer 5 includes a communication interface 60. The CPU 51 can establish communication with a server computer connected to a communication network via the communication interface 60, download the computer program 7 from the server computer, and store it in the storage device 59.

Even in the computer and the air cooling fan control method according to the fourth embodiment, the noise of the air cooling fan 58 during the low volume period is reduced and the temperature of the electric circuit is increased as in the disk reproducing device according to the first to third embodiments. Can be effectively suppressed.
In addition, it is possible to prevent the rotational speed of the air cooling fan 58 from increasing unnecessarily, and to effectively suppress the noise of the air cooling fan.

  Other configurations, operations, and effects of the computer according to the fourth embodiment are the same as those of the disk playback device according to the first embodiment. Detailed description thereof is omitted.

It is a block diagram which shows the structure of the disc reproducing | regenerating apparatus concerning embodiment of this invention. It is a graph which shows a temperature raising / lowering speed notionally. It is a timing chart which shows the processing content of rotation control of an air cooling fan. It is a flowchart which shows the process sequence of the control part which concerns on rotation control of an air cooling fan. It is a flowchart which shows the process sequence of the control part which concerns on rotation control of an air cooling fan. It is a timing chart which shows the temperature change of an electric circuit. It is a timing chart which shows the temperature change of the electric circuit concerning the 2nd modification. It is a graph which shows notionally an example of the temperature raising / lowering speed concerning the 3rd modification. 6 is a flowchart illustrating a processing procedure of a control unit related to rotation control of an air cooling fan in a second embodiment. 6 is a flowchart illustrating a processing procedure of a control unit related to rotation control of an air cooling fan in a second embodiment. 6 is a timing chart showing a temperature change of the electric circuit according to the second embodiment. It is a block diagram which shows the structure of the disc reproducing | regenerating apparatus concerning Embodiment 3 of this invention. It is a block diagram which shows the structure of the projector which concerns on Embodiment 3 of this invention. It is a block diagram which shows the structure of the computer which concerns on Embodiment 4 of this invention.

Explanation of symbols

3 Projector 6 Storage medium 7 Computer program 11, 31 Control unit 12 Playback unit 13 Decoder 14, 44 Memory 15 Volume detection unit 16 Video output unit 17 Audio output unit 18, 42, 58 Air-cooling fan 19, 45 Temperature raising / lowering speed storage unit 51 CPU
52 ROM
53 RAM
54 Timekeeping Unit 55 Auxiliary Storage Device 59 Storage Device 60 Communication Interface M Recording Medium

Claims (9)

In electrical equipment with an air cooling fan that cools the electrical circuit,
Obtaining means for obtaining audio data having at least information indicating the magnitude of audio to be reproduced by a speaker ;
Means for accumulating the audio data acquired by the acquisition means;
Volume detection means for detecting a low volume period of low volume and a high volume period of high volume based on the accumulated audio data;
Fan control means for increasing / decreasing the number of rotations of the air-cooling fan in the high volume period detected by the volume detection means in accordance with the length / shortness of the low volume period after the high volume period. And electrical equipment. An air-cooling fan for air-cooling the electric circuit, and a reproducing means for reproducing audio data having at least information indicating the magnitude of the audio to be reproduced by a speaker, the air-cooling fan having a larger volume of reproduced audio data, In an audio playback device designed to rotate at high speed,
Means for storing audio data having at least information indicating the magnitude of audio to be reproduced by a speaker ;
Volume detection means for detecting a low volume period with a low volume and a high volume period with a high volume before the audio data is reproduced based on the accumulated audio data;
Fan control means for increasing / decreasing the number of rotations of the air-cooling fan in the high volume period detected by the volume detection means in accordance with the length / shortness of the low volume period after the high volume period. An audio playback device. The fan control means includes
Means for rotating the air cooling fan at a low speed in a low volume period;
Means for rotating the air cooling fan at medium speed or high speed in a large volume period;
Determining means for determining the time length so that the time length of the period during which the air cooling fan is rotated at a high speed becomes long / short according to the length / shortness of the low sound volume period detected by the sound volume detecting means. The sound reproducing device according to claim 2, wherein The volume detection means includes
Based on the accumulated audio data, a high volume period, a medium volume period and a low volume period are detected,
Storage means for storing the temperature raising and lowering speed of the electric circuit at high speed, medium speed and low speed rotation;
The determining means includes
| T _L × L | ≦ | T _M × M + T _H × H |
4. The audio reproduction device according to claim 3, wherein a time length of a period during which the air cooling fan is rotated at a high speed is determined so as to satisfy the condition.
However,
T _L : Temperature increase / decrease speed of the electric circuit during low speed rotation T _M : Temperature increase / decrease speed of the electric circuit during medium speed rotation T _H : Temperature increase / decrease speed of the electric circuit during high speed rotation L: Low speed of the air cooling fan Period of rotation M: Period of rotating the air cooling fan at medium speed H: Period of rotating the air cooling fan at high speed The volume detection means includes
Based on the audio data, the high volume period, the medium volume period and the low volume period are detected.
Comprising storage means for preliminarily storing the temperature raising / lowering speed of the electric circuit at high speed, medium speed and low speed rotation;
The fan control means includes
Based on the temperature increase / decrease speed stored in the storage means and the large volume period, medium volume period, and low volume period detected by the volume detection means, the temperature drop during the high volume period is equal to or higher than the temperature increase during the low volume period. Means for determining whether or not
The sound reproducing apparatus according to claim 3, further comprising means for extending a period during which the air cooling fan is rotated at a high speed when it is determined as NO. The predetermined temperature is
The sound reproducing device according to claim 5, wherein the temperature is higher than an equilibrium temperature of the electric circuit when the air cooling fan is rotated at a medium speed. The fan control means includes
The sound reproducing device according to any one of claims 2 to 6, further comprising means for increasing / decreasing the number of rotations of the air-cooling fan during a low volume period. The number of rotations of the air cooling fan included in the audio reproduction device that reproduces audio data having at least information indicating the magnitude of the audio to be reproduced by the speaker is controlled so as to increase as the volume of the audio data to be reproduced increases. In the air cooling fan control method,
Storing audio data having at least information indicating the magnitude of audio to be reproduced by a speaker ;
Based on the accumulated audio data, a low volume period with a low volume and a high volume period with a high volume are detected before the audio data is reproduced,
An air cooling fan control method, comprising: increasing / decreasing the number of rotations of the air cooling fan in the detected large volume period according to the length / shortness of the small volume period after the large volume period. In a computer program for causing a computer to calculate data for controlling an operation amount of an air cooling fan for air-cooling an electric circuit ,
The computer stores audio data having at least information indicating the magnitude of the audio to be reproduced by the speaker ,
Let the computer detect a low volume period with a low volume and a high volume period with a high volume based on the accumulated audio data before the audio data is played back,
A computer that causes the computer to calculate data for increasing / decreasing the amount of operation of the air-cooling fan in the detected loud volume period according to the length / shortness of the small volume period after the loud volume period. program.

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