JP2005286726A - Acoustic device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an acoustic device wherein distortion is less caused in sound at a low frequency band and a high frequency band even when a sound volume variable means increases the sound volume. <P>SOLUTION: The acoustic device comprises: the sound volume variable means 5 for adjusting an acoustic signal along a loudness curve set to each sound volume in advance; an amplifier means 7 for amplifying the acoustic signal whose sound volume is adjusted by the sound volume variable means 5 and outputting the amplified signal to a speaker 3; and a control means 8 for detecting the sound volume adjustment amount by the sound volume variable means 5 and controlling at least either of the low sound frequency band and the high sound frequency band of the acoustic signal when the sound volume adjustment amount exceeds a preset prescribed value, and even when the sound volume variable means 5 increases the sound volume, since at least either of the low sound frequency band and the high sound frequency band of the acoustic signal is attenuated and the resulting signal is outputted from the speaker 3, the sound is not distorted at the low sound frequency band and the high sound frequency band. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an acoustic device that is mainly used in a vehicle.

  Conventionally, vehicles such as automobiles are equipped with an in-vehicle audio device called car audio so that music and the like can be enjoyed with necessary and sufficient sound effects even in the interior of the vehicle. Uses a woofer that outputs a low frequency range and a tweeter that outputs a mid to high frequency range, and has a sound system equivalent to listening to music indoors. It is like that.

Further, the conventional acoustic apparatus is provided with a sound volume varying means comprising a loudness volume, and the sound signal is adjusted by the sound volume varying means along a human audibility (loudness) curve as shown in FIG. Therefore, it is possible to listen to music with a sense of incongruity and discomfort, and the normal loudness curve increases the bass and treble at low volumes, and the characteristics flatten with increasing volume In many cases, such a setting is made (for example, Patent Document 1).
JP 9-31540 A

  However, as in the loudness curve shown in FIG. 4, the low and high frequencies are emphasized when the volume is low, and the volume is adjusted by the volume changing means so that the characteristic is flattened as the volume is increased. If the volume adjustment amount by the volume changing means is a predetermined value, for example, 25 clicks (clicking is given in advance to the dial for operating the volume changing means as a guide for volume adjustment) or less, the volume adjustment means Because it is emphasized, a comfortable audibility can be obtained even at a relatively low volume, but when the volume adjustment amount exceeds 25 clicks of the predetermined value, it is amplified in the low and high ranges as the volume signal increases due to the flat loudness curve Since the limit of the gain of the means comes first, distortion occurs in the sound in the low range and high range, and the auditory sensation is extremely lowered due to the boomy feeling and peaky feeling, And chatter occurs in part of the body when the mounting acoustic device, there are problems such as increasing discomfort.

  The present invention has been made to improve the conventional problems, and it is an object of the present invention to provide an acoustic apparatus that hardly causes distortion in a sound in a low range or a high range even when the volume is increased by a volume changing unit. It is what.

  The acoustic apparatus of the present invention includes a volume varying unit that adjusts an acoustic signal along a characteristic curve set in advance for each volume, and an amplifying unit that amplifies the sound signal adjusted by the volume varying unit and outputs the amplified signal to a speaker. When the volume adjustment amount by the volume changing means is detected and the volume adjustment amount exceeds a preset predetermined value, at least one of the low frequency range and the high frequency range of the acoustic signal is attenuated The control means which controls so that it may be provided is provided.

  With the above configuration, when the volume adjustment amount by the volume varying means exceeds a predetermined value, since at least one of the low range and the high range is attenuated and output from the speaker, the sound is not distorted in the low range or the high range, This makes it possible to listen to music and the like with a voice that does not have a boomy or peaky feeling.

  In the acoustic device of the present invention, the characteristic curve is set so that the low frequency range and the high frequency range increase when the volume adjustment amount is equal to or less than the predetermined value, and at least one of the low frequency range and the high frequency range is attenuated when the volume exceeds the predetermined value. Is.

  With the above configuration, when the volume adjustment amount by the volume varying means is less than or equal to the predetermined value, the low and high frequencies are emphasized along the characteristic curve, so that a sound with sharpness in the high and low ranges is output from the speaker. As a result, it is possible to listen to music etc. with the same acoustic effect as in a vehicle interior, and when the volume adjustment amount by the volume variable means exceeds a predetermined value, at least one of the low range and the high range is attenuated and output from the speaker. Therefore, the sound is not distorted in the low sound range and the high sound range, and thereby music or the like can be heard with a sound without a boomy feeling or a peaky feeling, so that the hearing feeling is not impaired. Note that the peky sound is an unpleasant sound caused by distortion in the high range when the volume of hearing is increased, and the boomy sound is an unpleasant sound caused by distortion in the low range.

  The acoustic device of the present invention is provided with a filter unit composed of a low-pass filter and a high-pass filter between the volume varying unit and the amplifying unit, and the volume adjustment amount by the volume varying unit exceeds a preset predetermined value In addition, the filter means is controlled by the control means so that at least one of the low sound range and the high sound range of the acoustic signal is attenuated.

  With the above configuration, it is possible to easily increase or decrease the low frequency range and the high frequency range along the characteristic curve.

  The acoustic device of the present invention is a vehicle-mounted acoustic device mounted on a vehicle.

  With the above-described configuration, even if the volume is increased to a predetermined value or more by the volume changing means, the vehicle body does not become unstable, so that no discomfort is felt.

  According to the acoustic device of the present invention, when the volume adjustment amount by the volume varying unit exceeds a predetermined value, at least one of the low frequency range and the high frequency range is attenuated and output from the speaker. Without distortion, music can be listened to with a voice without a boomy or peaky feeling.

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

  FIG. 1 is a block diagram showing a schematic configuration of an in-vehicle acoustic device, FIG. 2 is a diagram showing a loudness curve adopted by the in-vehicle acoustic device, and FIG. 3 is a flowchart showing an operation.

  The main body 1 of the in-vehicle acoustic device is installed near the center of an instrument panel (not shown) provided in the front part of the vehicle interior, and the main body 1 and the electric cable are provided at both ends of the instrument panel. A pair of left and right speakers 3 connected by 2 are installed so that the speakers 3 can listen to music in stereo. Each speaker 3 has a woofer 3a for outputting low sounds and a tweeter for outputting middle and high sounds. 3b.

  In the body 1 of the in-vehicle acoustic device, a tuner for receiving radio broadcasts such as FM, and playback means 4 for playing back music media such as CD and MD are provided, and the playback means 4 comprises a loudness volume. It is connected to the amplifying means 6 through a volume changing means 5 and a filter means 6 comprising a band pass filter.

  The sound volume varying means 5 is constituted by an electronic volume, and an acoustic signal output from the reproducing means 4 by rotating a dial (not shown) provided at a position that is easy to operate from the vehicle interior side of the main body 1. The dial can be arbitrarily adjusted, and the dial is provided with a click feeling as an indication of the volume by clicking means (not shown).

  The volume varying means 5 is connected to the control means 8 so that the control means 8 detects the volume adjustment amount of the volume varying means 5. The control means 8 detects the volume adjustment detected by the volume varying means 5. Accordingly, the filter means 6 is controlled along the loudness curve shown in FIG.

  The loudness curve shown in FIG. 2 is a curve in which the low frequency range and the high frequency range are emphasized in the same manner as the conventional loudness curve shown in FIG. The filter means 6 is controlled so that the low-frequency component (A portion in FIG. 2) and the high-frequency component (B portion in FIG. 2) are gradually attenuated when the click becomes more than 25 clicks. Yes.

  The filter means 6 is composed of a low-pass filter and a high-pass filter, and is controlled by the control means 8 so that the low-frequency component and the high-frequency component are increased or decreased by the respective filters. The acoustic signal is amplified by the amplification means 7.

  The amplification means 7 has power amplifiers 7a and 7b divided into a left channel L-CH and a right channel R-CH. The left channel power amplifier 7a includes a left speaker 3 and a right channel power amplifier. A speaker 3 on the right side is connected to 7b via an electric cable 2.

  Next, the operation of the acoustic apparatus constructed as described above will be described with reference to the flowchart shown in FIG.

  When the power source of the sound device main body 1 is turned on to listen to music or the like in the passenger compartment and a music medium such as a CD or MD is reproduced by the reproducing means 4, the volume varying means 5 is shown in step S1 of the flowchart shown in FIG. The sound signal is input from the reproducing means 4.

  The control means 8 for controlling the volume changing means 5 detects the volume adjustment amount of the volume changing means 5 from the number of clicks on the dial in step S2. If the number of clicks is a predetermined value, for example, 25 or less, the control means 8 proceeds to step S3. The control means 8 increases the gain of the low-pass filter provided in the filter means 6 by a predetermined amount along the loudness curve shown in FIG. 2, and also increases the gain of the high-pass filter provided in the filter means 6 in step S4. Increase by a predetermined amount.

  As a result, the volume of the sound signal output from the reproducing means 4 is adjusted by the volume changing means 5 and the low and high frequencies are adjusted by the filter means 6 so as to follow the loudness curve. Is output.

  The amplifying means 7 amplifies the sound signal whose volume is adjusted by the sound volume varying means 5 and whose bass and treble are increased (emphasized) by the filter means 6 and outputs them to the left and right speakers 3, respectively. From the speaker 3, a sound with sharpness in the high and low frequencies is output as stereo, and music and the like can be enjoyed with the same acoustic effect as in a vehicle interior.

  On the other hand, when the number of clicks detected by the volume varying means 5 in step S2 of the flowchart shown in FIG. 3 is a predetermined value, for example, 25 or more, the process proceeds to step S5, where the control means 8 is the low-pass filter provided in the filter means 6. The gain is attenuated by a predetermined amount along the loudness curve shown in FIG. 2, and the gain of the high-pass filter provided in the filter means 6 is attenuated by a predetermined amount along the loudness curve in step S6.

  As a result, the sound signal output from the reproducing means 4 is adjusted in volume by the volume varying means 5 and attenuated so that the low frequency range and the high frequency range follow the loudness curve by the filter means 6, and then the amplifying means in step S7. 7 is output.

  The amplifying unit 7 amplifies the sound signal whose volume is adjusted by the volume varying unit 5 and attenuated the low range and high range by the filter unit 6 and outputs the amplified signal to the left and right speakers 3, respectively. Sounds without a boomy feeling or peaky feeling are output as stereo, the hearing feeling is not impaired, and the vehicle body does not become wrinkled, so there is no discomfort.

  In the above embodiment, when the volume adjustment amount by the volume varying means 5 exceeds a predetermined value, both the low frequency range and the high frequency range of the acoustic signal are attenuated, but only one of them is attenuated. Also good.

  Further, the present invention is not limited to the on-vehicle acoustic device, and can be applied to all acoustic equipment used indoors.

  In the acoustic device of the present invention, even when the volume is increased by the volume changing means, at least one of the low range and the high range is attenuated and output from the speaker, so that the sound may be distorted in the low range or the high range. As a result, music and the like can be heard with a voice without a boomy feeling or a peaky feeling, which is optimal for an acoustic device mounted on a vehicle and used.

It is a block diagram which shows schematic structure of the audio equipment which becomes embodiment of this invention. It is a diagram which shows the loudness curve which the audio equipment which becomes embodiment of this invention employ | adopted. It is a flowchart which shows the effect | action of the audio equipment which becomes embodiment of this invention. It is a diagram which shows the loudness curve which the conventional audio equipment employ | adopted.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sound apparatus main body 3 Speaker 5 Volume changing means 6 Filter means 7 Amplifying means 8 Control means

Claims (4)

An audio apparatus comprising: a volume varying unit that adjusts an acoustic signal along a characteristic curve set in advance for each volume; and an amplifying unit that amplifies the audio signal adjusted by the volume varying unit and outputs the amplified signal to a speaker. And detecting a volume adjustment amount by the volume changing means and attenuating at least one of the low frequency range and the high frequency range of the acoustic signal when the volume adjustment amount exceeds a preset predetermined value. An acoustic apparatus comprising a control means for controlling. The characteristic curve is set so that the low frequency range and the high frequency range increase when the volume adjustment amount is equal to or less than a predetermined value, and at least one of the low frequency range and the high frequency range is attenuated when the volume exceeds the predetermined value. The acoustic device according to claim 1. When the volume varying means and the amplification means are provided with filter means comprising a low-pass filter and a high-pass filter, and the volume adjustment amount by the volume varying means exceeds a preset predetermined value, the filter The acoustic apparatus according to claim 1 or 2, wherein at least one of a low frequency range and a high frequency range of the acoustic signal is attenuated by controlling the means by the control means. The acoustic device according to any one of claims 1 to 3, wherein the acoustic device is a vehicle-mounted acoustic device mounted on a vehicle.

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