JPH10233626A - Cooling control method for voice amplifier and acoustic equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the need for a temperature sensor by directly interlocking an output of a cooler that cools a voice amplifier with a voice output and to avoid machine sound of the cooler from being offensive to the ear even when the voice output repeats increase/decrease in a short time. SOLUTION: A control microcomputer 5 binarizes voice level data received from a voice amplifier 3 into a high level and a low level based on a prescribed threshold level. In the case that a level of the binarized data is logical H for a prescribed time or over, cooling output control data are set to logical H. Furthermore, in the case that the level of the binary data is logical L for a prescribed time or over, the cooling output control data are set to logical L. The machine sound of the cooler in a listening sense is reduced through the setting of the prescribed time, and in the case that an output level of the voice amplifier 3 is changed in a short time, the cooling output of the cooler is not sensitively reacted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound amplifying device for amplifying a sound signal and an acoustic device having the sound amplifying device. Related to technology.

[0002]

2. Description of the Related Art Conventionally, a cooling device that cools an audio amplifier detects a rise in temperature inside the audio equipment by using a temperature sensor, and rotates a fan of the cooling device in accordance with the detected signal to provide a sound to the audio amplifier. An air cooling device that cools by applying wind is common.

[0003]

The above-mentioned conventional cooling device requires a temperature sensor. Further, since the operation of the cooling device is not directly linked to the output of the audio signal, the cooling device may be operated at a high output even if the audio output is low. At this time, mechanical noise generated by a fan or the like of the cooling device may be annoying.

[0004] Therefore, it is conceivable to control the cooling device directly in conjunction with the audio output. However, simply controlling the cooling device directly linked to the audio output,
When the sound output repeatedly increases and decreases in a short time, the output of the cooling device also increases and decreases at the same time, so that mechanical noise may be heard rather than when the cooling device is continuously operated at a high output.

[0005] The present invention has been made in view of the above-described problems, and eliminates the need for a temperature sensor by directly interlocking with the audio output, and furthermore, when the audio output repeatedly increases and decreases in a short time. Another object of the present invention is to provide a means for preventing the mechanical noise of the cooling device from being annoying.

[0006]

A cooling control method for an audio amplifier according to the present invention is particularly effective when the output level of the audio amplifier is continuously higher than a predetermined level for a predetermined first time or more. Cooling is performed, and when the output level of the audio amplifying device is continuously smaller than a predetermined fixed level for a predetermined second time or more, the cooling is weakly performed.

An audio device according to the present invention includes an audio amplifier, a cooling device for cooling the audio amplifier, and a control device for controlling the output of the cooling device according to the output level of the audio amplifier. The control device sets the output of the cooling device to be high when the output level of the audio amplifier is equal to or higher than a predetermined level continuously for a predetermined first time or more, and outputs the output level of the audio amplifier. The second predetermined
The output of the cooling device is set to be low when the level is smaller than a predetermined level continuously for at least a predetermined time.

According to the present invention, when the output level of the audio amplifier for amplifying the audio signal is continuously higher than the predetermined level for a predetermined first time or more, the output of the cooling device is set high. Therefore, the audio amplifying device is strongly cooled. Further, when the output level of the audio amplifier that amplifies the audio signal is continuously lower than the predetermined level for a predetermined second time or longer, the output of the cooling device is set to be low. Weakly cooled.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a block diagram showing a configuration of an audio equipment to which the present invention is applied. The audio device 1 includes an audio reproducing device 2 that reproduces an audio signal, an audio amplifier 3 that amplifies an output of the audio reproducing device 2, and an audio output device 4 that outputs an output of the audio amplifier 3 to the outside. ing. And
An external speaker 8 is connected to the audio output device 4.

The audio device 1 shown in FIG. 1 includes a control microcomputer 5 for controlling the entire audio device 1 and the like.
An air cooling device 6 for cooling the audio amplifier 3 and a power supply device 7 for supplying a drive voltage to the air cooling device 6 are provided.

An audio reproducing apparatus is an apparatus for reproducing an audio signal from a CD (compact disk) or MD (mini disk), and an apparatus for reproducing an audio signal from a video cassette, a DVD (digital video disk), or the like. , FM
A tuner, a device for receiving an audio signal of a television broadcast, and the like. The audio reproducing device 2 reproduces an audio signal and outputs the audio signal to the audio amplifying device 3, and also communicates serial data with the control microcomputer 5 to receive settings such as an operation mode of the audio reproducing device 2. I do.

The audio amplifying device 3 amplifies the input audio signal and outputs it to the audio output device 4, and also provides audio level data to the control microcomputer 5. In addition, the air cooling device 6 is arranged so as to be cooled by wind generated by the fan.

The audio output device 4 is mainly composed of an impedance matching resistor and a terminal, and outputs an audio signal from the audio amplification device 3 to an external speaker 8.

The control microcomputer 5 communicates serial data for setting an operation mode (such as a disk reproduction mode) of the audio reproducing apparatus 2 with the audio reproducing apparatus 2 in accordance with a user's input operation. In addition, according to the sound level data from the sound amplification device 3, cooling power control data for controlling the air cooling device 6 is given to the power supply device 7.

The power supply 7 has a high level (hereinafter H) according to the cooling output control data from the control microcomputer 5.
) Or a low level (hereinafter referred to as L) voltage is applied to the air cooling device 6.

The air cooling device 6 controls the cooling output to the audio amplification device 3 by rotating the fan at a high speed or a low speed according to the H or L voltage from the power supply device 7. Next, the operation of the audio equipment 1 will be described, focusing on the processing in which the control microcomputer 5 controls the air cooling device 6. FIG.
Shows the relationship between the audio level data output by the audio amplifier 3, the data obtained by binarizing the audio level data by the control microcomputer 5, and the cooling output control data created by the control microcomputer 5.

As shown in FIG. 1, the control microcomputer 5 binarizes the audio level data fetched from the audio amplifier 3 into H and L based on a predetermined threshold Th1. Then, when the level of the binarized data is in the H state for a predetermined time or more, the level of the cooling output control data is set to H. This constant time is adjusted with a constant B. Further, when the level of the binarized data is L for a predetermined time or more, the level of the cooling output control data is set to L. This constant time is adjusted by a constant A.

Here, by increasing the value of the constant A,
When the output of the audio amplifying device 3 suddenly decreases, control is performed so that the cooling output quickly decreases. This makes it possible to reduce the mechanical sound of the cooling device in terms of audibility. Further, by increasing the value of the constant B, the cooling output of the cooling device is prevented from reacting sharply when the output level of the audio amplifier 3 changes in a short time. Thereby, the mechanical noise generated when the cooling output of the cooling device changes between H and L can be suppressed.

FIG. 3 is a flowchart showing a process when the control microcomputer 5 creates the cooling output control data.

First, the value of the counter X is set to 0 as shown in step S1 of FIG. Next, as shown in step S2, the process waits for a predetermined time. This is because the control microcomputer 5 is configured to execute this process at regular intervals (for example, one field period).

Next, as shown in step S3, the level of the binarized data obtained by binarizing the audio level data is checked.
If the level of the binarized data is H, B is added to X until the value obtained by adding the constant B to X exceeds a predetermined maximum value (Max) (steps S4 and S4).
5). On the other hand, when the level of the binarized data is L, X
Is subtracted from X until the value of is smaller than the value of the constant A (steps S6 and S7).

Next, as shown in step S8, the value of X is compared with a constant C. If the value of X is equal to or greater than the value of C, the cooling output is set to H, and if the value of X is smaller than the value of C, In this case, the cooling output is set to L.

FIG. 4 shows an example of an operation timing chart of the control microcomputer 5 when producing the cooling output control data. Here, the constant A is 1600, the constant B is 100, the maximum value (Max) of X + B is 255, C
Is set to 128. In this case, the binary data is H
Is 1280 msec, the cooling output data changes from L to H, and the binarized data has a L duration of 80 ms.
At ec, the cooling output data changes from H to L.

[0025]

As described in detail above, according to the present invention, the cooling output is directly linked to the audio output, so that a temperature sensor is not required. Further, even if the sound output repeatedly increases and decreases in a short time, the output of the cooling device is changed to H or L only when the sound output remains in the H state or the L state for a certain period of time or longer.
Therefore, it is possible to prevent the mechanical noise of the cooling device from being annoying.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of an audio device to which the present invention has been applied.

FIG. 2 shows audio level data output by an audio amplifier,
It is a figure which shows the relationship between the data binarized by the control microcomputer and the cooling output control data created by the control microcomputer.

FIG. 3 is a flowchart showing a process when a control microcomputer creates cooling output control data.

FIG. 4 is an example of an operation timing chart of a control microcomputer when creating cooling output control data.

[Explanation of symbols]

1 audio equipment, 3 audio amplifier, 5 control microcomputer, 6 air cooling.

Claims (4)

[Claims] 1. A cooling control method for an audio amplification device for amplifying an audio signal, wherein the audio amplification device is strongly controlled when an output level of the audio amplification device is continuously higher than a predetermined constant level for a predetermined first time or more. After cooling, the output level of the audio
A cooling control method for an audio amplifying device, wherein the cooling is weakly performed when the predetermined level is lower than a predetermined level continuously for at least a predetermined time. 2. The method according to claim 1, wherein the first time is a relatively large value,
2. The method according to claim 1, wherein the second time is a relatively small value. 3. An audio equipment comprising an audio amplifier, a cooling device for cooling the audio amplifier, and a control device for controlling an output of the cooling device according to an output level of the audio amplifier. The control device sets the output of the cooling device to be high when the output level is equal to or higher than a predetermined level continuously for a predetermined first time or more, and the output level is set to a predetermined second level. An acoustic device wherein the output of the cooling device is set to be low when the level is smaller than a predetermined level continuously for a period of time or more. 4. The first time is set to a relatively large value,
The audio device according to claim 3, wherein the second time is set to a relatively small value.