JP2003009300A - Acoustic reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an acoustic reproducing device that enhances connection of sound images with respect to low frequency sounds and improves a low frequency sound characteristic such as solving of deficient low frequency sound volume under the conditions of a limit in the interior of a cabin, use of only a small capacity speaker and insufficient low frequency sound characteristics. SOLUTION: The acoustic reproducing device is provided with a high pass filter 5 that receives a sub woofer signal and outputs only its high frequency component and adders 6a-6d for summing an output of the high pass filter 5 and left front, right front, left rear and right rear signals outputted from a preamplifier 2 that are inserted between the preamplifier 2 and power amplifiers 3a-3d.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound reproducing device capable of excellently reproducing a multi-channel source in, for example, a passenger compartment.

[0002]

2. Description of the Related Art Heretofore, as a sound reproducing apparatus for improving an unnatural sound field in a vehicle compartment, a sound reproducing apparatus described in Japanese Utility Model Laid-Open No. 5-50900 is known.

FIG. 8 shows the structure of a conventional sound reproducing apparatus. The reproduced signal from the signal source 101 is the signal processing circuit 10.
2 is provided and a front signal and a rear signal output from the signal processing circuit 102 are combined, and a controller 103 for adjusting a mixing ratio of the combined signal is provided, and an output of the controller 103 is output via a power amplifier 104b. Rear door speaker 10
5b. On the other hand, the front signal and the rear signal are the power amplifiers 104a and 104a, respectively.
It is supplied to the front speaker 105a and the rear speaker 105c via 04c.

As a result, the output signal of the rear door speaker is output as a composite signal which allows the mixing ratio of the front and rear output signals to be arbitrarily set, and the sound field of the acoustic output that suits the optimum taste is obtained for both the front and rear seats of the vehicle. Can be built.

[0005]

In this sound reproducing device, a subwoofer or the like can be added in a situation where only a small speaker can be used and the bass characteristic is not sufficient under the limitation of the passenger compartment. Only unnaturally, it may be heard from another place, or the bass volume itself may be insufficient depending on the place, and improvement thereof is required.

The present invention is intended to solve this problem, and in a sound reproducing device in a vehicle compartment, improves the bass characteristics such as improving the connection of sound images particularly for bass and eliminating insufficient volume of bass. The purpose is to

[0007]

In order to solve this problem, the sound reproducing device of the present invention has the following configuration.

According to a first aspect of the present invention, there is provided a signal source for reproducing a multi-channel signal, a preamplifier for pre-processing each channel signal, a power amplifier for power-amplifying each channel signal, and a power amplifier for the power amplifier. The preamplifier and the power adder, which is composed of a speaker for inputting an output, adds an output of a high-pass filter which inputs a subwoofer signal and outputs only a high frequency component thereof and some channel signals output from the preamplifier. It is inserted between the amplifier and the bass, so that the higher component can be heard from the whole, and the bass from the subwoofer can be heard from a specific direction in the special sound field of the vehicle interior. It is possible to improve the ability to hear only the sound and the connection with the sound from other speakers, and to reproduce natural bass. Having an iodine.

According to a second aspect of the present invention, in the invention according to the first aspect, the multi-channel signals are 6-channel signals of left front, right front, left rear, right rear, center and subwoofer. It is configured to have an adder with a subwoofer signal at four positions in each of the left front, right front, left rear, and right rear signal sections. It has the effect of improving the bass characteristics.

According to a third aspect of the present invention, in the second aspect of the invention, the high-pass filter and each adder are realized by an analog circuit, and a natural bass characteristic can be improved. With any DV
Even if it is combined with a D player or a CD player, the same characteristic can be maintained.

According to a fourth aspect of the present invention, there is provided a signal source for reproducing a multi-channel signal, a preamplifier for pre-processing each channel signal, a power amplifier for power-amplifying each channel signal, and a power amplifier for the power amplifier. The preamplifier includes an adder which is composed of a speaker for inputting an output, adds all the outputs of each low-pass filter which inputs a few channel signals output from the preamplifier, and outputs only the low frequency component thereof, and the subwoofer signal. Inserted between the subwoofer signal output and its power amplifier, a high-pass filter is inserted between the output from the preamplifier and the power amplifier for all channel signals input to the adder via the low-pass filter. It is configured to be inserted, including left front, right front, left rear, and right rear. From each speaker has an effect of higher-quality sound is reproduced, and bass also can play rich.

According to a fifth aspect of the present invention, in the invention according to the fourth aspect, the multi-channel signals are 6-channel signals of left front, right front, left rear, right rear, center and subwoofer. It is configured to add four signals of left front, right front, left rear, right rear to the subwoofer signal,
In the frequently used 6-channel recording system, the sound quality of each speaker can be improved and bass can be reproduced richly.

According to a sixth aspect of the present invention, in the invention according to the fifth aspect, the low-pass filter, the high-pass filter and each adder are realized by an analog circuit, and the sound quality of each speaker is Can improve
Further, the bass can be reproduced richly, and even if it is combined with any DVD player or CD player, the same characteristic can be maintained.

According to a seventh aspect of the present invention, a signal source for reproducing a multi-channel signal, a preamplifier for preprocessing each channel signal, a power amplifier for power-amplifying each channel signal, and a power amplifier for the power amplifier are provided. A preamplifier and a power amplifier that consist of a speaker that inputs the output, and add two adders that add the output of the low-pass filter that inputs the center signal and output only the low-frequency signal and each of the left front and right front channel signals. In the environment where it is difficult to install a large center speaker, a high-pass filter that inserts the center signal and outputs only the high frequency signal is inserted between the preamplifier and the power amplifier. ,
This has the effect of reducing the load on the center speaker and enabling playback with higher sound quality as a whole.

According to an eighth aspect of the present invention, in the invention according to the seventh aspect, the low-pass filter, the high-pass filter and each adder are realized by an analog circuit. It has the effect of reducing the load and maintaining the same characteristics even when combined with any DVD player or CD player.

According to a ninth aspect of the present invention, there is provided a signal source for reproducing a multi-channel signal, a pre-amplifier for pre-processing each channel signal and outputting some new channel signals, and each channel signal. It is composed of a power amplifier that amplifies power and a speaker that inputs the output of the power amplifier, and has an effect of reducing the load on each speaker and enabling higher quality sound reproduction as a whole.

According to a tenth aspect of the present invention, in the invention according to the ninth aspect, the preamplifier synthesizes each channel signal and the subwoofer signal, and again separates each channel signal and the subwoofer signal. With the configuration of speakers such as left front, right front, left rear, right rear, center, and subwoofer that are often used in the passenger compartment, the burden on each speaker is reduced and overall higher sound quality is achieved. It has an effect of enabling reproduction.

According to an eleventh aspect of the present invention, in the invention according to the tenth aspect, the configuration of the preamplifier is realized by an analog circuit, and the burden on each speaker is reduced, resulting in higher sound quality as a whole. It has the effect of enabling similar reproduction and maintaining the same characteristics even when combined with any DVD player or CD player.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIGS. 1 to 7.

(Embodiment 1) FIG. 1 shows an audio reproducing apparatus according to a first embodiment of the present invention. In FIG.
Is a signal source, such as a DVD player or a CD player capable of reproducing a multi-channel source. Reference numeral 2 is a preamplifier for inputting the signal of the signal source 1 and pre-processing each channel signal. As an example, the output signal thereof includes a left front, a right front, a left rear, a right rear, a center and a subwoofer. In FIG. 1, FL, FR, RL, RR, CNT, and SW are respectively displayed. In addition, in many vehicle-mounted systems, the signal source 1 and the preamplifier 2 are integrated. 3a
3f to 3f are power amplifiers, which power-amplify each channel signal. Speakers 4a to 4f are driven by the power amplifiers 3a to 3f, respectively, and convert each channel signal into sound. As an example, each speaker 4a
4 to 4f are installed in the vehicle cabin at positions as shown in FIG. A high-pass filter 5 is connected to the subwoofer signal of the preamplifier 2. Reference numerals 6a to 6d denote adders, which add the output of the high-pass filter 5 and the signals of the left front, right front, left rear, and right rear, respectively. The outputs of the respective adders 6a to 6d are connected to the left front, right front, left rear, and right rear power amplifiers 3a to 3d, respectively. The output from the preamplifier 2 is directly connected to the power amplifiers 3e and 3f of the center and subwoofers. Further, depending on the case, an adder for adding the output of the high-pass filter 5 to the center signal may be inserted.

The high-pass filter 5 and the adders 6a to 6d shown above can be digitally processed inside the preamplifier 2 or can be constituted by analog circuits. When configured with analog circuits, these can be integrated in the power amplifier block as a part of the power amplifiers 3a to 3f.

Next, these operations will be described. The signal source 1 outputs a digital signal read from DVD software or CD software. The preamplifier 2 converts the digital signal from the signal source 1 into each channel signal. Normally, a decoder and a D / A converter corresponding to the recording method of each software convert the signals into six signals of left front, right front, left rear, right rear, center, and subwoofer. Of these signals, the subwoofer signal is input to the subwoofer power amplifier 3f, and is also converted by the high-pass filter 5 into a signal in which only the high frequency component remains. The characteristics of the high-pass filter 5 are set so that the high frequency components are frequency components that can be reproduced by the left front, right front, left rear, and right rear speakers 4a to 4d. For the left front, right front, left rear, and right rear channel signals, adders 6a through 6a
The high frequency component of the subwoofer signal is added to the original signal by d. Therefore, from the left front, right front, left rear, and right rear speakers 4a to 4d, in addition to the sound originally contained in the DVD software and the CD software, the sound of the subwoofer signal is mixed and output. Will be.

With the above configuration, the higher component can be heard from the whole even in the low tone, and the low tone from the subwoofer can be heard only from a specific direction in the special sound field of the vehicle interior. Or, the connection with the sound from another speaker can be improved, and the effect of reproducing a natural low tone can be obtained.

Further, the high-pass filter 5 and the adder 6a
If 6d is composed of an analog circuit and is integrated with the power amplifier block, a DVD player or a CD
Since it is independent of the player and their preamplifiers, it is possible to perform the optimum signal processing for the sound field in the vehicle compartment only with the power amplifier and the speaker, so that any DVD player or C
There is also an advantage that it can be combined with a D player.

(Second Embodiment) FIG. 3 shows an audio reproducing apparatus according to a second embodiment of the present invention. In FIG.
Is a signal source, 2 is a preamplifier, 3a to 3f are power amplifiers, and 4a to 4f are speakers. These are the same as those according to the first embodiment of the present invention, and thus detailed description will be omitted. Omit it.

7a to 7d are low-pass filters,
It is connected to the left front, right front, left rear, and right rear channel signals of the preamplifier 2. Reference numerals 8a to 8d are high-pass filters, which are connected to the left front, right front, left rear, and right rear channel signals of the preamplifier 2. The outputs of the high pass filters 8a to 8d are connected to the power amplifiers 3a to 3d. An adder 9 is connected to the outputs of the low-pass filters 7a to 7d and the subwoofer output from the preamplifier 2. Further, in some cases, a high-pass filter and a low-pass filter may be added to the center signal portion and connected to the adder 9. The output of the adder 9 is connected to the subwoofer power amplifier 3f.

Next, these operations will be described. Similar to the first embodiment of the present invention, the left front, right front, left rear, right rear, center,
Six subwoofer signals are output. From these four signals, left front, right front, left rear, and right rear, low pass filters 7a to 7d respectively
Only the low frequency component is left. The frequencies are set to include the frequency bands that are difficult to output in the left front, right front, left rear, and right rear speakers 4a to 4d, and the low-pass filters 7a to 7d have different characteristics. Good. Further, the high-pass filters 8a to 8d are set so as to output the frequency band that reversely removes the remaining frequency band by the low-pass filters 7a to 7d, respectively. As a result, the left front speaker, the right front speaker, the left rear speaker, and the right rear speaker 4a-4
From d, sounds excluding those frequency bands that are difficult to output are reproduced, so that reproduction with higher sound quality is possible. In addition, the removed low frequency component has room for low frequency reproduction,
Since it is output from the subwoofer speaker 4f, the original low tone is also reproduced.

With the above configuration, it is possible to obtain the effect that higher-quality sound can be reproduced from the left front, right front, left rear, and right rear speakers 4a to 4d, and bass can also be reproduced richly.

Also in this case, when the low-pass filter, the high-pass filter and the adder are formed by analog circuits and are integrated with the power amplifier block, they can be combined with any DVD player or CD player. There are also advantages.

(Embodiment 3) The sound reproducing apparatus according to the third embodiment of the present invention is very similar to that shown in the first embodiment of the present invention and the second embodiment of the present invention. Since it is a configuration and has a feature in the center signal processing unit, FIG.
Shows only that part. In FIG. 4, 10 is a low-pass filter and 11 is a high-pass filter, both of which are connected to the center signal output from the preamplifier. The output of the high pass filter 11 is connected to the center power amplifier 3e. Reference numerals 12a and 12b denote adders, which are connected to the left front and right front signals and the signal of the low pass filter 10, respectively. The outputs of the adders 12a and 12b are connected to the left front and right front power amplifiers 3a and 3b, respectively.

Next, these operations will be described. Similar to the first embodiment of the present invention, from the preamplifier, the left front, right front, left rear, right rear, center,
Six subwoofer signals are output. Of these, the center signal is divided into a low-pass component and a high-pass component by the low-pass filter 10 and the high-pass filter 11. Among them, the high frequency component is a frequency component that the center speaker 4e can reproduce with high sound quality, and the low frequency component is another frequency component. This low frequency component is added to the adders 12a and 12a.
It is added to the left front and right front signals by b. As a result, a high-quality sound in which the low-frequency portion that is difficult to output is removed is reproduced from the center speaker 4e, and the removed low-frequency portion is left front,
It is reproduced from the right front speakers 4a and 4b. Generally, the left front and right front speakers 4a and 4b have a larger diameter than the center speaker 4e, and have excellent low-frequency reproduction capability, so that a richer bass sound can be obtained as a whole.

With the above structure, the effect of reducing the load on the center speaker and enabling higher quality sound reproduction as a whole is obtained in the vehicle interior, especially in an environment where it is difficult to attach a large center speaker. .

Also in this case, when the low-pass filter, the high-pass filter and the adder are formed by analog circuits and integrated with the power amplifier block, they can be combined with any DVD player or CD player. There are also advantages.

(Embodiment 4) A sound reproducing device according to a fourth embodiment of the present invention is very similar to that shown in the first embodiment of the present invention and the second embodiment of the present invention. Since it is a configuration and has a feature in the center signal processing unit, FIG.
Shows only that part. In FIG. 5, reference numeral 1 is a signal source such as a DVD player or a CD player. Reference numeral 2 is a preamplifier having a function of inputting the signal of the signal source 1 and generating another multi-channel signal from the multi-channel signal recorded in the DVD software or the CD software itself. 3a to 3f and 4a to 4f are power amplifiers and speakers for signals based on multi-channel signals recorded in DVD software and CD software itself, and an arbitrary number of power amplifiers 3g for newly generated signals. To 3z and 4g to 4z can be added.

FIG. 6 shows an example of the layout of the passenger compartment. In FIG. 6, front seats and rear seats are at the front,
The rear and center speakers are arranged, and the newly generated signals include left front, right front, left rear, right rear, rear seat signals simulating the center, left front 2, right front 2, The left rear 2, the right rear 2, and the center 2 are used.

Next, these operations will be described. Similar to the first embodiment of the present invention, the preamplifier generates six signals of left front, right front, left rear, right rear, center and subwoofer. further,
These six signals are converted into optimum frequency characteristics for the sound field in the passenger compartment and the characteristics of each speaker. DVD in general
The multi-channel signal recorded in the software or the CD software itself is recorded for a home-use sound reproducing device. If this is reproduced in the passenger compartment as it is, the left front,
The bass component may be too large for the right front, left rear, right rear, and center speakers. In this case, as shown in FIGS. 7 (a) to 7 (b), the low frequency components of the left front, right front, left rear, right rear, and center signals are removed, and the removed components are divided into sub-frequency components. By adding to the woofer signal, the load on each of the left front, right front, left rear, right rear, and center speakers is reduced, and overall high sound quality can be achieved.

With the above structure, in an environment where it is difficult to attach a large speaker, such as in a vehicle compartment, the effect of reducing the load on each speaker and enabling higher quality sound reproduction as a whole can be obtained.

Also in this case, when the low-pass filter, the high-pass filter and the adder are formed by analog circuits and are integrated with the power amplifier block, they can be combined with any DVD player or CD player. There are also advantages.

The invention described above is effective not only in the passenger compartment, but also in domestic and commercial sound reproducing devices.

[0040]

As described above, according to the present invention, it is possible to obtain the advantageous effects of improving the connection of high, middle, and low tones and eliminating the lack of low tones in accordance with each vehicle compartment space.

Further, by using the analog signal processing circuit of the present invention, the acoustic space in each vehicle compartment can be optimized after the amplifier section, so that the player or decoder such as DVD or CD can be freely selected. To be

[Brief description of drawings]

FIG. 1 is a block diagram showing an audio reproducing device according to a first embodiment of the present invention.

[Fig. 2] Speaker installation diagram inside the vehicle by the same device

FIG. 3 is a block diagram showing an audio reproducing device according to a second embodiment of the present invention.

FIG. 4 is a block diagram showing an audio reproducing device according to a third embodiment of the present invention.

FIG. 5 is a block diagram showing an audio reproducing device according to a fourth embodiment of the present invention.

FIG. 6 is a speaker installation diagram in the vehicle interior when the number of speakers by the device is increased.

7A and 7B are characteristic diagrams showing an example of frequency characteristic conversion.

FIG. 8 is a block diagram showing a conventional sound reproducing device.

[Explanation of symbols]

1 signal source 2 preamplifier 3a-3f power amplifier 4a-4f speaker 5,8a-8d, 11 High-pass filter 6a-6d, 9, 12a, 12b adder 7a-7d, 10 low-pass filter

Claims (11)

[Claims] 1. A signal source for reproducing a multi-channel signal, a pre-amplifier for pre-processing each channel signal, and a power amplifier for power-amplifying each channel signal,
It consists of a speaker that inputs the output of the power amplifier,
A sound in which an adder for adding the output of a high-pass filter that inputs a subwoofer signal and outputs only its high frequency component and some channel signals output from the preamplifier is inserted between the preamplifier and the power amplifier. Playback device. 2. The multi-channel signal comprises a left front,
It consists of 6 channel signals of right front, left rear, right rear, center, subwoofer, and has four adders with the subwoofer signal in each signal part of left front, right front, left rear, right rear. The sound reproducing device according to claim 1. 3. The sound reproducing device according to claim 2, wherein the high-pass filter and each adder are realized by an analog circuit. 4. A signal source for reproducing multi-channel signals, a pre-amplifier for pre-processing each channel signal, and a power amplifier for power-amplifying each channel signal.
It consists of a speaker that inputs the output of the power amplifier,
The subwoofer signal output of the preamplifier and its power are added to the adder for adding all the outputs of each low pass filter that outputs only the low-frequency component of several channel signals output from the preamplifier and the subwoofer signal. A sound reproduction device in which a high-pass filter is inserted between an output from the preamplifier and a power amplifier for all channel signals inserted between the amplifiers and inputting signals to the adder through the low-pass filter. 5. The multi-channel signal includes a left front,
It consists of 6 channel signals of right front, left rear, right rear, center and subwoofer, and is configured to add four signals of left front, right front, left rear and right rear to the subwoofer signal. Item 4. The sound reproducing device according to item 4. 6. The sound reproducing device according to claim 5, wherein the low-pass filter, the high-pass filter and each adder are realized by an analog circuit. 7. A signal source for reproducing a multi-channel signal, a pre-amplifier for pre-processing each channel signal, and a power amplifier for power-amplifying each channel signal,
It consists of a speaker that inputs the output of the power amplifier,
A low-pass filter that inputs the center signal and outputs only the low-pass signal, and two adders that add the output of the low-pass filter and the left front and right front channel signals, respectively, are provided between each preamplifier and power amplifier. A sound reproducing device configured to insert a high-pass filter that inserts a center signal and outputs only a high frequency signal between the preamplifier and the power amplifier. 8. The sound reproducing device according to claim 7, wherein the low-pass filter, the high-pass filter and each adder are realized by an analog circuit. 9. A signal source for reproducing a multi-channel signal, a pre-amplifier for pre-processing each channel signal and outputting some new channel signals, a power amplifier for power-amplifying each channel signal, and a power amplifier thereof. A sound reproducing device configured with a speaker for inputting the output of. 10. The sound reproducing device according to claim 9, wherein the preamplifier synthesizes each channel signal and the subwoofer signal, and again separates each channel signal and the subwoofer signal. 11. The sound reproducing device according to claim 10, wherein the preamplifier is realized by an analog circuit.