JP3861388B2 - Audio output control device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an audio output control device for an electronic device having an audio output function such as an audio device such as an in-vehicle cassette deck or a video device.
[0002]
[Prior art]
The audio output of conventional audio equipment, video equipment, etc. has been simply determined by the user's volume operation.
[0003]
[Problems to be solved by the invention]
However, since the above-mentioned conventional audio equipment uses a relatively small amplifier, if the volume operation level of the user is simply reflected in the audio output level, the output reaches the ripple point, and particularly the bass and treble are distorted. It was out.
[0004]
The present invention solves the above-described conventional problems, and an object of the present invention is to provide an audio output control device capable of reducing distortion of audio output when a user operates a volume. It is.
[0005]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention is configured to detect a user's volume operation and control the gains of bass and treble according to the volume level.
[0006]
As a result, an audio output control device can be obtained that can reduce distortion of audio output when the user operates the volume.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
According to the first aspect of the present invention, the volume value of the gain adjusting means for adjusting the level of the frequency band of the acoustic output of the electronic device and the volume means for adjusting the output level of the electronic device are determined and determined. And a means for controlling the setting level of the gain adjusting means to change in accordance with the volume value. When the volume means is operated, it is converted into an actual volume value, and the value reaches a maximum value. If it is determined that the gain is present, the gain adjustment means for adjusting the level of the frequency band of the sound output of the electronic device can be instructed to lower the gain of the low and high frequencies.
[0008]
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is an external front view showing an in-vehicle acoustic device equipped with a cassette deck as an electronic device to which an audio output control device according to an embodiment of the present invention is applied, and FIG. 2 is a block diagram showing the audio output control device. .
[0009]
In FIG. 1, 1 is a main body of an audio device, 2 is a cassette insertion slot for inserting a cassette, 3 is a display device, 4 is a volume operation button, and 5 is a mode button for switching between AM and FM modes.
[0010]
In FIG. 2, reference numeral 10 denotes a microprocessor body, which includes means 11 for detecting the operation state of the volume operation button 4, volume level conversion processing means 12 for quantifying the volume operation state, and bass and treble from the quantified volume value. And a central processing unit 13 for controlling an electronic volume 14 to be described later based on this determination. Reference numeral 14 denotes an electronic volume main body that controls the speaker 17, and includes a bass gain adjustment circuit 15 and a treble gain adjustment circuit 16.
[0011]
The volume state detection means 11 detects the presence or absence of rotation of the volume operation button 4 because a pulse signal is input if the volume operation button 4 is rotated, and no pulse is input if the volume operation button 4 is not rotated. be able to. Then, based on the signal from the volume state detection means 11, the volume level conversion processing means 12 converts it into an actual volume value, and when the central processing unit 13 determines that the value has reached the maximum vicinity, By outputting a control command to the main body 14 so as to limit the boost amount of the bass and treble, it is possible to reduce the sound output.
[0012]
FIG. 3 shows an operation flow of the above embodiment. The volume state detection means 11 monitors the volume state by the volume operation button 4 (step a). Now, when the volume operation button 4 is operated, the volume state detection means 11 detects a change due to the operation (step b), and based on this detection, the volume level conversion processing means 12 converts it into an actual volume value (step b). c). When the central processing unit 13 determines that the volume value quantified by this conversion exceeds a certain value X (step d), the central processing unit 13 determines a gain value for the electronic volume 14 (step e), and determines the determined gain value. It is sent to the electronic volume 14 (step f). As an example, when the volume value reaches the maximum, the low frequency and high frequency gains of the output sound are reduced. Thereby, the distortion of the audio output that reaches the clip point and appears distorted is reduced. When the volume value detected in step c is equal to or less than a certain value X, processing for returning the gain value to the normal audio output state is performed (steps g and h).
[0013]
【The invention's effect】
As described above, according to the present invention, the volume operation of the user is detected, and the gain of the bass and treble is controlled in accordance with the volume level. Distortion can be reduced.
[Brief description of the drawings]
FIG. 1 is an external front view showing an on-vehicle audio device equipped with a cassette deck as an electronic device to which an audio output control device according to an embodiment of the present invention is applied. FIG. 2 is a block diagram showing the audio output control device. FIG. 3 is a flowchart for explaining the operation of the audio output control apparatus.
4 Volume operation button 11 Volume state detection means 12 Volume level conversion processing means 13 Central processing unit 14 Electronic volume

Claims (1)

An electronic volume having a bass gain adjustment circuit and a treble gain adjustment circuit for controlling speaker output, a central processing means for controlling the electronic volume, a volume state detection means for detecting an operation state of a volume operation button, and the volume state detection Volume level conversion processing means for digitizing the volume operation state detected by the means, and when the volume level quantified by the volume conversion processing means exceeds a certain value, the central processing means An audio output control device that determines a gain value for a volume, sends the determined gain value to the electronic volume, and the electronic volume reduces a low frequency gain and a high frequency gain of the output audio by the determined gain value .

Images