JP2002078071A - Mfb speaker system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an MFB(Motional Feed Back) speaker system in which a large sized and complicated configuration can be avoided even when the number of speaker units in use is increased. SOLUTION: By using vibration information of an optical speaker unit among speaker units 35-1, 35-2,...35-n that are fitted respectively to enclosed cabinets 30-1, 30-2,...30-n of the same volume, have almost the same specifications and are connected in parallel, the vibration of the other control units can be controlled. The MFB speaker system is realized with the configuration provided with a vibration sensor 40, a feedback circuit 50, an adder/subtractor 10 and a power amplifier 20 even when the number of the speaker units is increased.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker system of the MFB (motional feedback) system for feeding back vibration information of a speaker unit to an input signal. The present invention relates to an MFB speaker system suitable for improving characteristics such as enlargement.

[0002]

2. Description of the Related Art FIG.
System (up and down) ”(Radio Engineering, July 1, 1977)
5th), p. 1 is a circuit block diagram showing a configuration example of a conventional MFB speaker system disclosed in 406.
In the figure, 100 is a signal input terminal to a speaker, 110
Amplifier gain is _{G A} is 120 feedback circuit gain beta, 130 is a loudspeaker of the voltage gain _{G S.} Symbol E
_i is the input voltage, _Ev is the input voltage to the speaker 130,
E _s denotes the output voltage from the speaker 130.

Next, the operation will be described. The electric signal input from the signal input terminal 100 is amplified by the amplifier 110 and drives the speaker 130. In the speaker 130, sound is emitted by the vibration of the diaphragm. At the same time, the vibration of the diaphragm is detected by signal detection means (not shown) provided inside the speaker 130 and sent to the feedback circuit 120. The signal fed back by the feedback circuit 120 is applied to the signal input terminal 10.
The signal is combined with the input signal from 0 to drive the speaker 130.

In this MFB speaker system, an amplifier 110 is used for driving a speaker 130. The amplifier 110 includes a feedback circuit 120 and a speaker 130.
The whole functions as one system. In the conventional MFB speaker system, the signal to the feedback circuit 120 is returned with a negative polarity to the input signal (negative feedback) in order to reduce distortion and improve characteristics mainly.
Is common.

FIG. 15 is a structural block diagram showing the configuration of the MFB speaker system shown in FIG. 15, the same or corresponding parts as in FIG. 14 are denoted by the same reference numerals, and description thereof will be omitted. In the figure, reference numeral 10 denotes a feedback signal output from a feedback circuit 120 and a signal input terminal 100.
Adder / subtracter for adding or subtracting an input signal input from a speaker, 30 is a closed cabinet for a closed speaker system, 35 is a speaker unit, and 40 is a vibration for detecting vibration information of a diaphragm for the speaker unit. It is a sensor.

When the MFB speaker system of FIG. 15 is applied to a speaker system using a plurality of closed speaker systems in which a speaker unit is arranged in a closed cabinet, the configuration is represented by a structural block diagram shown in FIG. . In the figure, 10-1, 10-2,
.., 10-n are adders / subtractors for adding or subtracting a feedback signal output from a feedback circuit in each closed speaker system and an input signal input from the signal input terminal 100, 20-1, 20-2,. 20-n are power amplifiers for amplifying the signals output from the respective adders / subtractors and driving the speaker units, 130-1, 130-2,.
-N is a closed cabinet for a closed speaker system, and each closed cabinet has a different volume. , 35-n are speaker units, 40-1, 40-2, ..., 40-n are vibration sensors for detecting vibration information of a diaphragm for the speaker unit,
50-n are feedback circuits.

[0007]

Since the conventional MFB speaker system is configured as described above, when the number of closed speaker systems to be used increases, each of the closed speaker systems due to a difference in the volume of each closed cabinet or the like. In order to cope with the difference in the characteristics of the speaker systems, an adder / subtractor, an amplifier, a vibration sensor, and a feedback circuit are individually required for each of the closed-type speaker systems.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems. Even if the number of speaker units used increases, a vibration sensor for detecting vibration information and a vibration sensor for an input signal of a speaker system. An object of the present invention is to provide an MFB speaker system that can be configured with a minimum number of adders / subtractors, amplifiers, feedback circuits, and the like for performing feedback processing based on information, and that can avoid an increase in size and complexity.

[0009]

An MFB speaker system according to the present invention has a plurality of speaker units mounted in a closed cabinet, and has a connection structure in which input voltages to the respective speaker units are the same and have the same specifications. A speaker system to which each of the speaker units is connected;
A vibration sensor for detecting vibration information of one of the speaker units constituting the speaker system, and returning vibration information detected by the vibration sensor to an input side of the speaker system; Feedback means for performing feedback processing on an input signal to the speaker system.

[0010] The MFB speaker system according to the present invention has a structure in which each speaker unit connected by a wiring structure in which the input voltage is the same as that of the other speaker units is mounted in an independent closed-type cabinet having the same capacity. This is provided with a speaker system.

[0011] The MFB speaker system according to the present invention has a structure in which each speaker unit connected by a wiring structure having the same input voltage as other speaker units is mounted in a common closed cabinet. It is provided with a system.

[0012] In the MFB speaker system according to the present invention, each left speaker unit connected by a connection structure having the same input voltage as the other left speaker units is mounted in an independent left sealed cabinet having the same volume. A left speaker system having a structure, and a structure in which each right speaker unit connected by a wiring structure in which the input voltage is the same as the other right speaker units are mounted in independent right-sided closed cabinets having the same capacity. And the right speaker system.

The MFB speaker system according to the present invention has a structure in which each of the left speaker units connected by a wiring structure having the same input voltage as the other left speaker units is mounted in a common left sealed cabinet. The left speaker system and the right speaker system having a structure in which each right speaker unit connected by a wiring structure having the same input voltage as the other right speaker units is mounted in a common right closed cabinet. It is prepared for.

The MFB speaker system according to the present invention has a configuration in which the specifications of the left speaker unit and the right speaker unit, and the volumes of the left sealed cabinet and the right sealed cabinet are the same.

The MFB speaker system according to the present invention comprises a left vibration sensor for detecting vibration information of one of the left speaker units constituting the left speaker system, and a respective one constituting the right speaker system. A right vibration sensor that detects vibration information of one of the right speaker units of the right speaker unit, and vibration information detected by the left vibration sensor,
A left feedback unit that returns to an input side of the left speaker system and performs a feedback process based on the vibration information on an input signal to the left speaker system; And right-side feedback means for returning to the input side of the system and performing feedback processing based on the vibration information on the input signal to the right speaker system.

In the MFB speaker system according to the present invention, the left speaker unit detects vibration information of one of the left speaker units constituting the left speaker system or the right speaker units constituting the right speaker system. And a vibration sensor common to the right speaker system and vibration information common to the left and right speaker systems detected by the vibration sensor are returned to the input sides of the left speaker system and the right speaker system, and And a feedback unit having a feedback circuit common to the left and right speaker systems for performing a feedback process based on the vibration information on an input signal to the speaker system and the right speaker system. .

In the MFB speaker system according to the present invention, each speaker unit is connected in a parallel connection structure in which the input voltage is the same as that of the other speaker units.

In the MFB speaker system according to the present invention, each speaker unit is connected in a series connection structure in which the input voltage is the same as that of the other speaker units.

In the MFB speaker system according to the present invention, each speaker unit is connected in a series-parallel connection structure in which the input voltage is the same as that of the other speaker units.

In the MFB speaker system according to the present invention, the input voltage to each speaker unit is the same between the left speaker units, between the right speaker units, and between the left speaker unit and the right speaker unit. And a configuration in which the left speaker unit and the right speaker unit are connected in parallel.

In the MFB speaker system according to the present invention, the input voltage to each speaker unit is the same between the left speaker units, between the right speaker units, and between the left speaker unit and the right speaker unit. And a configuration in which the left speaker unit and the right speaker unit are connected in series.

According to the MFB speaker system of the present invention, the input voltage to each speaker unit is the same between the left speaker units, between the right speaker units, and between the left speaker unit and the right speaker unit. And a configuration in which the left speaker unit and the right speaker unit are connected in series and parallel, respectively.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below. Embodiment 1 FIG. FIG. 1 is a structural block diagram showing a configuration of an MFB speaker system (motional feedback type speaker system for feeding back vibration information of a speaker unit to an input signal) according to the first embodiment. , 30-n are closed-type cabinets of substantially the same volume, 35-1, 35-2,..., 35-n.
Is a speaker unit attached to each closed cabinet and having substantially the same specifications and connected in parallel. 40 is a vibration unit from any one of the speaker units 35-1, 35-2,... 35-n. A vibration sensor for detecting information, 50 is a feedback circuit (feedback means) having a gain β for generating a feedback signal from a signal output from the vibration sensor 40, and 10 is a feedback signal output from the feedback circuit 50. An adder / subtractor (feedback means) 20 for adding or subtracting an input signal from a signal input terminal to the signal unit amplifies the signal output from the adder / subtractor 10, and uses the amplified signal to make speaker units 35-1 and 35-2. ,…
A power amplifier (feedback means) for driving 35-n.

Next, the operation will be described. The external input signal applied to the signal input terminal 100 is
0, and are connected to the speaker units 35-1, 35-2,... 35-n connected in parallel via the power amplifier 20. Next, vibration information from any one of the speaker units is detected by the vibration sensor 40, and is fed back to the adder / subtractor 10 via the feedback circuit 50. The adder / subtractor 10 combines the input signal and the feedback signal that is the output of the feedback circuit 50, and the combined signal is output from the speaker units 35-1 and 35-.
2,... 35-n.

In FIG. 1, a speaker unit 35-
, 35-n have almost the same specifications and are connected in parallel. .. 30-n having substantially the same volume, the input voltage to each speaker unit is substantially the same, that is, the vibration of each speaker unit is substantially the same in any speaker unit. Be the same. This means that the vibration of each speaker unit is represented by the vibration of any one speaker unit, and the vibration information of another speaker unit is obtained by using the vibration information of any one speaker unit. Can also be controlled. Therefore,
Even if the number of closed speaker systems in which the speaker units are mounted in a closed cabinet increases, the vibration sensor 40, the feedback circuit 50, the adder / subtractor 10, the power amplifier 20
It is possible to realize an MFB speaker system with a configuration including one each.

As described above, according to the first embodiment, in a speaker system in which a plurality of closed speaker systems in which a speaker unit is mounted in a closed cabinet are used in combination, almost the same speakers are connected in parallel. Speaker units 35-1, 35-2, ... 35-
n, and a closed cabinet 30-
, 30-n, and a vibration sensor 40 for detecting vibration information from an arbitrary one of the speaker units, and for controlling a signal output from the vibration sensor 40. A feedback circuit 50, an adder / subtracter 10 for adding or subtracting a feedback signal from the feedback circuit 50 and an input signal, amplifying a signal output from the adder / subtractor 10, and driving the speaker system with the amplified signal .. 35-n are connected in parallel, and the present invention is applied to a speaker system in which each of the speaker units is mounted in a closed cabinet. , The vibration sensor 40, the feedback circuit 50, the adder / subtractor 10, and the power amplifier 20. The effect of MFB speaker system capable of avoiding reduction is obtained.

Embodiment 2 FIG. FIG. 2 shows the second embodiment.
1 is a structural block diagram showing a configuration of an MFB speaker system of FIG. 2, the same or corresponding parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted. Also in the second embodiment, the speaker units 35-1, 35-2,.
5-n is a closed-type cabinet 30-1 having almost the same volume,
30-n, but the speaker units 35-1, 35-2,... 35-n are connected in series.

Next, the operation will be described. The external input signal applied to the signal input terminal 100 is
0, and are applied to the speaker units 35-1, 35-2,... 35-n connected in series via the power amplifier 20. Next, the speaker units 35-1, 35-2,.
Vibration information is detected by the vibration sensor 40 from any one of the speaker units 5-n, and is fed back to the adder / subtractor 10 via the feedback circuit 50. The adder / subtractor 10 combines the input signal and the feedback signal that is the output of the feedback circuit 50, and the combined signal is output from the speaker units 35-1 and 35-.
2,... 35-n.

In the structural block diagram of FIG. 2, the speaker units 35-1, 35-2,..., 35-n have almost the same specifications and are connected in series. Furthermore, closed-type cabinets 30-1, 30-2,...
, The input voltage to each speaker unit is substantially the same, that is, the vibration of each speaker unit is substantially the same for every speaker unit. This means that the vibration of each speaker unit is represented by the vibration of any one speaker unit, and the vibration information of another speaker unit is obtained by using the vibration information of any one speaker unit. Can also be controlled. Therefore, even if the number of sealed speaker systems using the speaker units connected in series increases, even if the number of the vibration sensors 40, the feedback circuit 50, the adder / subtractor 10, and the power amplifier 20 is one, each of the MFB speakers has a configuration. It is possible to realize the system.

As described above, according to the second embodiment, in a speaker system using a plurality of closed speaker systems in which a speaker unit is mounted in a closed cabinet, almost the same specifications connected in series are used. Speaker units 35-1, 35-2, ... 35-
n, and a closed cabinet 30-
, 30-n and a vibration sensor 40 for detecting vibration information from an arbitrary one of the speaker units, and generating a feedback signal from a signal output from the vibration sensor 40. A subtractor 10 for adding or subtracting a feedback signal output from the feedback circuit 50 and an external input signal; amplifying a signal output from the adder / subtractor 10; Power amplifier 20 for driving a speaker system using a plurality of speaker systems in combination with the amplified signal
Provided, the speaker units 35-1 and 35-
Even if the present invention is applied to a speaker system configured by combining a plurality of closed speaker systems in which 2,... 35-n are connected in series, one vibration sensor 40, one feedback circuit 50, one adder / subtractor 10, and one power amplifier 20 are provided MFB that can avoid the increase in size and complexity of the entire system
There is an effect that a speaker system can be obtained.

Embodiment 3 FIG. 3 shows the third embodiment.
1 is a structural block diagram showing a configuration of an MFB speaker system of FIG. In FIG. 3, the same or corresponding parts as those in FIG. 3 in the figure
0-1, 30-2, ... 30- (2m-1), 30-2m
Are even-numbered closed cabinets of almost the same volume, 35-1, 35-2, ..., 35- (2m-1),
35-2m has the same number (even number) as that of the closed cabinet, and is a speaker unit of almost the same specification attached to each closed cabinet. The speaker units 30-1 and 30-2, the speaker unit 30-3 and the speaker unit 30-4,... Are connected in series, and a plurality of speaker units are connected in series. Serial-parallel connection configuration. The set of the speaker units connected in parallel may be composed of three or more speaker units.

Next, the operation will be described. The input signal externally applied to the signal input terminal 100 is
Speaker units 35-1, 35-2,... 35- (2m-1), 3 connected in series / parallel via the power amplifier 20
5-2m. Next, the speaker unit 35-
, 35-2,..., 35- (2m-1), 35-2m, vibration information from an arbitrary one of the speaker units is detected by the vibration sensor 40 and transmitted to the adder / subtractor 10 via the feedback circuit 50. Will be returned. The adder / subtractor 10 combines the input signal from the outside and the feedback signal which is the output of the feedback circuit 50, and combines the combined signal with the speaker units 35-1 and 35-1.
35-2,..., 35- (2m-1), 35-2m.

In the structural block diagram of FIG. 3, the number of sealed cabinets and the number of speaker units are the same, and are selected from even numbers. Also, the speaker units 35-1 and 35-3
5-2,..., 35- (2m-1) and 35-2m have almost the same specifications, and are connected in series and parallel in a combination such that the input voltages to the respective speaker units are the same. Each is attached to a type cabinet. Therefore, the vibration of each speaker unit is almost the same in every speaker unit. This means that the vibration of each speaker unit is represented by the vibration of any one speaker unit, and the vibration information of another speaker unit is obtained by using the vibration information of any one speaker unit. Can also be controlled.

Accordingly, the speaker units 35-1 and 35
−2,... 35- (2m−1), 35-2m are connected in series and parallel to increase the number of hermetically sealed speaker systems.
0, one adder / subtracter 10, and one power amplifier 20 may be provided, and an MFB speaker system that can avoid the increase in size and complexity of the entire system can be obtained.

FIG. 4 is a connection diagram when four speaker units are used. When four speaker units are used, the series-parallel connection in which the input voltage to each speaker unit is the same is only one of the configurations shown in FIG. 3 other than the series-parallel connection shown in FIG.

FIG. 5 is a connection diagram when six speaker units are used. The combination of the series-parallel connection in which the input voltage to each speaker unit is the same is the two configurations shown in FIGS. 5A and 5B other than the series-parallel connection shown in FIG.

FIG. 6 is a connection diagram when eight speaker units are used. The combination of the series-parallel connection in which the input voltage to each speaker unit is the same is the combination of the series-parallel connection shown in FIGS.
It is on the street. If the number of speaker units is an even number of 10 or more, the number of combinations increases further. But of course it is good.

As described above, according to the third embodiment, in a speaker system in which a plurality of closed speaker systems are used in combination, speaker units 35-1 and 35- of substantially the same specifications connected in series and parallel are used. 2, ... 35-
(2m-1), 35-2m, and closed-type cabinets 30-1, 30-2, ..., 30- (2m-
1), a vibration sensor 40 that uses 30-2m and detects vibration information from an arbitrary one of the speaker units, a feedback circuit 50 for generating a feedback signal from an output of the vibration sensor 40, An adder / subtracter 10 for adding or subtracting a feedback signal output from the feedback circuit 50 and an external input signal, amplifying a signal output from the adder / subtractor 10, and combining a plurality of closed speaker systems. Since the power amplifier 20 for driving the amplified speaker system by the amplified signal is provided, the speaker unit 3
5-1, 35-2, ... 35- (2m-1), 35-2m
Can be applied to a speaker system having a configuration composed of a plurality of closed speaker systems connected in series / parallel, provided that the vibration sensor 40, the feedback circuit 50, the adder / subtractor 10, and the power amplifier 20 are provided one by one. Thus, there is an effect that an MFB speaker system that can avoid an increase in size and complexity of the entire system can be obtained.

Embodiment 4 FIG. 7 shows the fourth embodiment.
1 is a structural block diagram showing a configuration of an MFB speaker system of FIG. 7, parts that are the same as or correspond to those in FIG. 1 are given the same reference numerals, and descriptions thereof will be omitted. 3 in the figure
0 is a closed cabinet, 35-1, 35-2,... 35
-N is a speaker unit attached to the closed cabinet 30 and having substantially the same specifications and connected in parallel.

Next, the operation will be described. The external input signal applied to the signal input terminal 100 is
0, and are connected to the speaker units 35-1, 35-2,... 35-n connected in parallel via the power amplifier 20. Next, the speaker units 35-1, 35-2,.
Vibration information from any one of −n speaker units is detected by the vibration sensor 40 and fed back to the adder / subtractor 10 via the feedback circuit 50. The adder / subtractor 10 combines the input signal and the feedback signal that is the output of the feedback circuit 50, and the combined signal is output from the speaker units 35-1 and 35-.
2,... 35-n.

In the structural block diagram of FIG. 7, the speaker units 35-1, 35-2,..., 35-n have almost the same specifications and are connected in parallel. Furthermore, since these speaker units are attached to the common closed cabinet 30, the acoustic load applied to each speaker unit is the same, that is, the vibration of each speaker unit is almost the same for all speaker units. This means that the vibration of each speaker unit is represented by the vibration of any one speaker unit, and the vibration information of another speaker unit is obtained by using the vibration information of any one speaker unit. Can also be controlled. Therefore, even if the number of speaker units attached to the common closed cabinet 30 and used increases, the vibration sensor 4
0, a feedback circuit 50, an adder / subtractor 10, and a power amplifier 20 can be realized to realize an MFB speaker system.

As described above, according to the fourth embodiment, speaker units 3 of substantially the same specifications connected in parallel
.., 35-n are attached to a common closed cabinet 30 and a vibration sensor 40 for detecting vibration information from any one of the speaker units, and an output of the vibration sensor 40. , A feedback circuit 50 for generating a feedback signal, an adder / subtractor 10 for adding or subtracting a feedback signal output from the feedback circuit 50 and an external input signal, and amplifying a signal from the adder / subtractor 10. Since a power amplifier 20 for driving a speaker system configured to use a combination of a plurality of speaker units mounted on a common closed cabinet 30 is provided, a plurality of speakers mounted on the common closed cabinet 30 are provided. Even when applied to a speaker system using a combination of units, the vibration sensor 40, the feedback circuit 5
It is only necessary to provide one 0, one adder / subtracter 10, and one power amplifier 20. This has the effect of obtaining an MFB speaker system that can avoid an increase in size and complexity of the entire system.

Embodiment 5 FIG. FIG. 8 shows the fifth embodiment.
1 is a structural block diagram showing a configuration of an MFB speaker system of FIG. 8, the same or corresponding parts as those in FIG. 7 are denoted by the same reference numerals, and description thereof is omitted. In the MFB speaker system of the fifth embodiment, each speaker unit 35-1, 35-2,.
The specifications are almost the same as in the above, but they are connected in series.

Next, the operation will be described. The external input signal applied to the signal input terminal 100 is
0, and are applied to the speaker units 35-1, 35-2,... 35-n connected in series via the power amplifier 20. Next, the speaker units 35-1, 35-2,.
Vibration information from any one of the speaker units 5-n is detected by the vibration sensor 40 and is fed back to the adder / subtractor 10 via the feedback circuit 50. The adder / subtractor 10 combines the input signal and the feedback signal that is the output of the feedback circuit 50, and the combined signal is output to the speaker units 35-1 and 35.
−2,..., 35-n.

The speaker units 35-1, 35-2,...
35-n have almost the same specifications, are connected in series, and are attached to a common closed-type cabinet 30, so that the same acoustic load is applied to each speaker unit.
In other words, the vibration of each speaker unit is almost the same in every speaker unit. This means that the vibration of each speaker unit is represented by the vibration of any one speaker unit, and the vibration information of another speaker unit is obtained by using the vibration information of any one speaker unit. Can also be controlled. Therefore, even if the number of speaker units attached to and used in the common hermetically sealed cabinet 30 increases, the MFB speaker system has a configuration including one vibration sensor 40, one feedback circuit 50, one adder / subtractor 10, and one power amplifier 20. Can be realized.

As described above, according to the fifth embodiment,
A speaker unit having substantially the same specifications connected in series is attached to a common closed cabinet 30 and a vibration sensor 40 for detecting vibration information of an arbitrary one of the speaker units, and a feedback signal from an output of the vibration sensor 40 is provided. , An adder / subtracter 10 for adding or subtracting the feedback signal output from the feedback circuit 50 and the external input signal, the adder / subtractor 10
, 35-n are provided with the power amplifier 20 for driving the speaker system attached to the common closed cabinet 30. , 35-n connected in series.
Is applied to a loudspeaker system configured to be mounted on a common hermetically sealed cabinet 30, the vibration sensor 4
0, a feedback circuit 50, an adder / subtracter 10, and a power amplifier 20.
There is an effect that an MFB speaker system that can avoid complication is obtained.

Embodiment 6 FIG. FIG. 9 shows Embodiment 6
1 is a structural block diagram showing a configuration of an MFB speaker system of FIG. In FIG. 9, the same or corresponding parts as those in FIG. 7 are denoted by the same reference numerals, and description thereof will be omitted. 3 in the figure
1 is a closed cabinet, 35-1, 35-2,... 35
-(2m-1) and 35-2m are speaker units which are attached to the closed cabinet 31 and have almost the same specifications and are connected in series / parallel. In this case, a plurality of patterns can be considered for the arrangement configuration of the speaker units on the speaker unit mounting surface of the closed cabinet 31. In the sixth embodiment, the speaker units are arranged in a line on the speaker unit mounting surface. . A plurality of sets of the two speaker units connected in parallel are arranged on the speaker unit mounting surface.
It should be noted that the number of speaker units constituting the set of speaker units is not limited to two.

Next, the operation will be described. The external input signal applied to the signal input terminal 100 is
0, speaker units 35-1, 35-2,... 35- (2m-1
), 35-2m. Next, vibration information from any one of the speaker units is detected by the vibration sensor 40, and is fed back to the adder / subtractor 10 via the feedback circuit 50.
The adder / subtractor 10 combines the input signal and the feedback signal that is the output of the feedback circuit 50, and the combined signal is output from the speaker units 35-1, 35-2,.
3-2m is added to the power amplifier 20 for driving.

In the structural block diagram of FIG. 9, speaker units 35-1, 35-2,... 35- (2m-1
), 35-2m have almost the same specifications, are attached to the closed cabinet 31 and are connected in series and parallel in such a combination that the input voltage to each speaker unit is the same. Therefore, the vibration of each speaker unit is almost the same in every speaker unit. This means that the vibration of each speaker unit is represented by the vibration of any one speaker unit, and the vibration information of another speaker unit is obtained by using the vibration information of any one speaker unit. Can also be controlled. Therefore, even if the number of speaker units attached to the common closed cabinet 31 and used is increased, the vibration sensor 4
0, a feedback circuit 50, an adder / subtractor 10, and a power amplifier 20 can be realized to realize an MFB speaker system.

The combinations described in FIGS. 4, 5, and 6 can be applied to the combination of the series-parallel connection of a plurality of speaker units.

As described above, according to the sixth embodiment, speaker units 35-1, 35-2,..., 35- (2m-1), 35 which are connected in series and parallel and have almost the same specifications.
-(2m) is attached to a common closed cabinet 31 and a vibration sensor 40 for detecting vibration information from an arbitrary one of the speaker units, and a feedback circuit for generating a feedback signal from an output of the vibration sensor 40 50, an adder / subtractor 10 for adding or subtracting a feedback signal output from the feedback circuit 50 and an input signal input from the outside, and amplifying the signal output from the adder / subtractor 10 and connecting them in series / parallel. The speaker units 35-1, 35-2,
... Since the power amplifier 20 for driving a speaker system in which 35- (2m-1) and 35-2m are attached to a common closed cabinet 31 is provided, the speaker units 35-1 and 35 connected in series and parallel are provided. -2, ... 35
-When the speaker system is configured such that-(2m-1) and 35-2m are attached to a common closed cabinet 31, one vibration sensor 40, one feedback circuit 50, one adder / subtractor 10, and one power amplifier 20 are provided. MF that can avoid the increase in size and complexity of the entire system
There is an effect that a B speaker system can be obtained.

Embodiment 7 FIG. FIG. 10 is a structural block diagram showing a configuration of the MFB speaker system according to the seventh embodiment, and shows a case where the MFB speaker system is applied to a stereo speaker system. In the figure, 1
00L is a signal input terminal of a left input signal in a stereo system, 100R is a signal input terminal of a right input signal, 30-1L, 30-2L,... 30-nL are left sealed cabinets of substantially the same volume, 30 -1R, 30-2
R,... 30-nR are right-side closed cabinets having substantially the same volume. The left-side closed cabinet and the right-side closed cabinet have the same volume on both the left and right sides. 35-nL are left-side closed cabinets 30-1L, 30-2L,.
nL, left-side speaker units 35-1R, 35-2 having substantially the same specifications and connected in parallel.
R,... 35-nR are right-side closed cabinet 30-1
R, 30-2R,... 30-nR, respectively.
The right speaker units have almost the same specifications and are connected in parallel. The right speaker units 35-1R, 35-1R, 3
5-2R,... 35-nR and left speaker unit 35-
The specifications of 1L, 35-2L,... 35-nL are almost the same.

Reference numeral 40L denotes a left vibration sensor for detecting vibration information from any one of the left speaker units.
40R is a gain beta _L for generating right vibration sensor, 50L controls the signal output from the left side vibration sensor 40L feedback signal for detecting the vibration information from any one of the speaker units to the right left feedback circuit (left feedback means), 50R right feedback circuit (right feedback means) is the gain beta _R for generating a feedback signal to control signal output from the right vibration sensors 40R, 10L is left feedback circuit 50L Adder / subtractor (left feedback means) 10R for adding or subtracting the feedback signal output from the right side and the input signal on the left side adds or subtracts the feedback signal output from the right side feedback circuit 50R and the right side input signal. 20L amplifies the signal output from the left adder / subtractor 10L, and outputs the left speaker unit 35-1L. , 35-2L,... 35-nL for driving the left-side power amplifier (left-side feedback means),
20R amplifies the signal output from the right adder / subtractor 10R, and outputs the right speaker units 35-1R, 35-2R,.
A right power amplifier (right feedback means) for driving 35-nR.

It is assumed that a closed speaker system is constituted by a closed cabinet and a speaker unit mounted in the closed cabinet, and a left speaker system is constituted by a plurality of left closed speaker systems. The right speaker system is constituted by a plurality of closed speaker systems on the right.

Next, the operation will be described. Regarding the left speaker system, the left input signal applied to the signal input terminal 100L is connected to the left speaker units 35-1L, 35-2L,. nL. Next, the left speaker units 35-1L, 35-2
L,... 35-nL, vibration information from any one of the speaker units is detected by the left vibration sensor 40L,
The signal is fed back to the left adder / subtractor 10L via the left feedback circuit 50L. In the left adder / subtractor 10L, the left input signal and the feedback signal output from the left feedback circuit 50L are combined, and the combined signal is combined into the left speaker units 35-1L and 35-L.
2L,... 35-nL are added to the left power amplifier 20L. Although the left speaker system has been described above, the operation of the left speaker system is the same as that of the right speaker system, and thus the description of the operation of the right speaker system will be omitted.

In the left speaker system, the left speaker units 35-1L, 35-2L,.
35-nL have almost the same specifications and are connected in parallel. Furthermore, these left speaker units 35-1L, 3
5-2L,..., 35-nL are left closed cabinets 30-1L, 30-2L,.
Since it is attached to nL, the input voltage to each of the speaker units is substantially the same, that is, the vibration of each of the speaker units is substantially the same for any of the speaker units. This means that the vibration of each of the speaker units is represented by the vibration of any one of the left speaker units. The vibration of the speaker unit can also be controlled. Therefore, even if the number of closed speaker systems on the left side increases, the left vibration sensor 40L, the left feedback circuit 50L, and the left adder / subtracter 10
It is possible to realize the left MFB speaker system with a configuration including one L and one left power amplifier 20L.

In the right speaker system, right speaker units 35-1R, 35-2R,.
35-nR have almost the same specifications and are connected in parallel. Furthermore, a right-side closed cabinet 30 having substantially the same volume.
-1R, 30-2R,..., 30-nR, the input voltage to each of the speaker units is substantially the same, that is, the vibration of each of the speaker units is substantially the same for any of the speaker units. This means that the vibration of each right speaker unit is represented by the vibration of any one right speaker unit.
By using the vibration information of the right speaker units, the vibration of the other right speaker units can be controlled. Therefore, even if the number of right closed speaker systems increases, the right vibration sensor 40R, the right feedback circuit 50R, the right adder / subtractor 10R, and the right power amplifier 20R.
The MFB speaker system on the right side can be realized with a configuration including one each.

Further, since the volumes of the closed cabinets on the left and right sides and the specifications of the speaker units shown in FIG. 10 are almost the same, the operations of the left and right speaker systems are almost the same. Therefore, the left and right signals are reproduced with good left / right balance.

The connection method of the speaker units in FIG. 10 is shown by connecting the left speaker unit and the right speaker unit in parallel. However, if the same connection method is applied to the left speaker unit and the right speaker unit, the speaker units may be connected in series. Of course, connection or series-parallel connection may be used. However, in the case of serial-parallel connection, it is necessary that the input voltage to each speaker unit is the same on the left and right.

As described above, in the seventh embodiment, the left and right speaker systems having substantially the same specifications and the same volume as the left and right speaker systems are provided on the left and right sides by using a plurality of closed speaker systems in combination. A left vibration sensor 40L for detecting vibration information from an arbitrary one of the left speaker units and an arbitrary one of the right speaker units for each of the left and right speaker systems while using a speaker unit and a closed cabinet. Right vibration sensor 40R that detects vibration information from
A left feedback circuit 50L that generates a left feedback signal from the output of the left vibration sensor 40L, a right feedback circuit 50R that generates a right feedback signal from the output of the right vibration sensor 40R, a feedback signal output from the left feedback circuit 50L, and a left feedback circuit. Left adder / subtractor 10 for adding or subtracting the input signal of
L, for amplifying the signal output from the right adder / subtractor 10R and the left adder / subtractor 10L for adding or subtracting the feedback signal output from the right feedback circuit 50R and the right input signal to drive the left speaker system. The right and left power amplifiers 20R and 20R for amplifying the signals output from the left power amplifier 20L and the right adder / subtractor 10R and driving the right speaker system are provided respectively. Even if the system is used, the left and right speaker systems only need to be equipped with a vibration sensor, a feedback circuit, an adder / subtractor, and a power amplifier, respectively. There is an effect that an MFB speaker system that can avoid complication is obtained.

Embodiment 8 FIG. FIG. 11 is a structural block diagram showing a configuration of the MFB speaker system according to the eighth embodiment. 11, the same or corresponding parts as those in FIG. 10 are denoted by the same reference numerals, and description thereof will be omitted. While the MFB speaker system of the seventh embodiment is a combination of a plurality of closed speaker systems on both the left and right sides, in the eighth embodiment, the left speaker unit and the right speaker unit are mounted on a common closed cabinet, respectively. The left speaker system and the right speaker system are different in that the left speaker system and the right speaker system are configured. The connection configuration of each speaker unit in the left speaker unit and the right speaker unit is the same as that in the seventh embodiment. . In FIG. 11, 30
L is a left-side closed cabinet, and 30R is a right-side closed cabinet.

Next, the operation will be described. First, the left speaker system will be described.
The input signal applied to L is applied to left speaker units 35-1L, 35-2L,... 35-nL connected in parallel via a left adder / subtractor 10L and a left power amplifier 20L. Next, the left speaker units 35-1L, 35-
Vibration information from any one of the left speaker units of 2L,... 35-nL is detected by the left vibration sensor 40L, and is fed back to the left adder / subtractor 10L as a feedback signal output from the left feedback circuit 50L. Left adder / subtractor 10L
, The left input signal and the feedback signal output from the left feedback circuit 50L are combined, and the combined signal is used as a left power amplifier 20L for driving the left speaker units 35-1L, 35-2L,... 35-nL. Is added to The above operation is the same for the right speaker system.

The left speaker unit 35-1L,
35-2L,... 35-nL have almost the same specifications and are connected in parallel. Further, since all of these left speaker units are attached to the common left sealed cabinet 30L, the left speaker units are connected to each other. The input voltage is almost the same, that is, the vibration of each left speaker unit is almost the same in every speaker unit. This means that the vibration of each left speaker unit is represented by the vibration of any one speaker unit,
By using the vibration information of any one of the left speaker units, it is possible to control the vibration of the other left speaker unit. Therefore, for the left speaker system, even if the number of left speaker units to be used increases, it is sufficient to provide one left vibration sensor 40L, one left feedback circuit 50L, one left adder / subtractor 10L, and one left power amplifier 20L. With respect to the left speaker system, it is possible to avoid an increase in the size and complexity of the entire system.

Next, regarding the right speaker system, the right speaker units 35-1R, 35-2R,.
35-nR have almost the same specifications and are connected in parallel. Furthermore, these right speaker units 35-1R, 3-1
5-2R,..., 35-nR are all mounted on the common right-side closed cabinet 30R, so that the input voltage to each right speaker unit is almost the same, that is, the vibration of each right speaker unit is almost the same for every speaker unit. become. This means that the vibration of each right speaker unit is represented by the vibration of any one of the right speaker units. The vibration of the unit can also be controlled. Therefore, for the right speaker system, even if the number of right speaker units to be used increases, it is sufficient to provide one right vibration sensor 40R, one right feedback circuit 50R, one right adder / subtractor 10R, and one right power amplifier 20R. The right speaker system has an effect of obtaining an MFB speaker system that can avoid an increase in size and complexity of the entire system.

Further, regarding the left and right speaker systems shown in FIG.
L and the right-side closed cabinet 30R have substantially the same volume, and the left speaker units 35-1L and 3-1L have the same volume.
5-2L,... 35-nL, right speaker unit 35-
Since the specifications of 1R, 35-2R,..., 35-nR are almost the same, the operations regarding the left and right speaker systems are also almost the same. Therefore, the left and right input signals are reproduced with a good left-right balance.

Although the left speaker unit and the right speaker unit are connected in parallel in the connection method of the speaker unit in FIG. 11, if the same connection method is used for the left speaker unit and the right speaker unit, the speaker unit may be connected in series. It goes without saying that connection or series / parallel connection may be used. However, in the case of serial-parallel connection, it is necessary that the input voltage to each speaker unit is the same on both the left and right sides.

As described above, according to the eighth embodiment, a speaker system having a configuration in which a plurality of speaker units are provided in one closed cabinet is disposed on the left and right sides, and is used as a left speaker unit and a right speaker unit. A speaker unit having almost the same specifications and a closed cabinet having substantially the same volume as the left closed cabinet and the right closed cabinet are used. For the left speaker system and the right speaker system, any one of the left speaker units is used. The left side vibration sensor 40L for detecting vibration information from the right speaker unit, the right side vibration sensor 40R for detecting vibration information from any one of the right speaker units, and the signal from the left side vibration sensor 40L are controlled to generate a feedback signal on the left side. A left feedback circuit 50L for generating
A right feedback circuit 50R for controlling a signal from the right vibration sensor 40R to generate a right feedback signal, a left adder / subtractor 10L for adding or subtracting a feedback signal output from the left feedback circuit 50L and an input signal, A right adder / subtractor 10R for adding or subtracting a feedback signal output from the right feedback circuit 50R and an input signal, a left power amplifier 20L for amplifying a signal output from the left adder / subtractor 10L and driving a left speaker system; Right power amplifiers 20R for amplifying the signal output from the right adder / subtractor 10R and driving the right speaker system are provided. For this reason, even if a plurality of speaker units are used for the left speaker system and the right speaker system, it is only necessary that each of the left and right units includes a vibration sensor, a feedback circuit, an adder / subtractor, and a power amplifier. MF that can avoid the increase in size and complexity of the entire system
There is an effect that a B-type speaker system can be obtained.

Embodiment 9 FIG. 12 is a structural block diagram showing a configuration of the MFB speaker system according to the ninth embodiment. 12, parts that are the same as or correspond to those in FIG. 10 are given the same reference numerals, and descriptions thereof will be omitted. In the figure, 41 is a vibration sensor that detects vibration information from any one of the speaker units of the left and right speaker systems, and 53 is a vibration sensor that is common to the left speaker system and the right speaker system. A feedback circuit common to the left and right speaker systems for controlling the output signal and generating a feedback signal.

Next, the operation will be described. In the left speaker system, the left input signal applied to the signal input terminal 100L is applied to the left speaker unit 3 connected in parallel via the left adder / subtractor 10L and the left power amplifier 20L.
5-1L, 35-2L,... 35-nL. Next, the left speaker units 35-1L, 35-2L,.
35-nL and right speaker unit 35-1R, 35-
The vibration information of any one of the 2R,... 35-nR is detected by the vibration sensor 41 and is fed back to the left adder / subtractor 10L via the feedback circuit 53. In the left adder / subtractor 10L, the left input signal and the feedback signal output from the feedback circuit 53 are combined, and the combined signal is combined into the left speaker units 35-1L and 35-L.
2L,... 35-nL are added to the left power amplifier 20L.

In the right speaker system, the right input signal applied to the signal input terminal 100R is combined with the feedback signal output from the feedback circuit 53 by the right adder / subtractor 10R and connected in parallel via the right power amplifier 20R. 35 of the right speaker units 35-1R, 35-2R,.
-NR.

The left speaker units 35-1L, 35-
.. 35-nL have almost the same specifications and are connected in parallel. Further, since they are mounted in the left sealed cabinet having substantially the same volume, the input voltage to each left speaker unit is almost the same, that is, the vibration of each speaker unit is almost the same in every speaker unit.

The right speaker unit 35-1R,
.., 35-nR have almost the same specifications and are connected in parallel. Furthermore, since the speaker units are mounted in the right-side closed cabinet having substantially the same volume, the input voltage to each speaker unit is substantially the same, that is, the vibration of each speaker unit is substantially the same for every speaker unit.

In the ninth embodiment, the left speaker units 35-1L, 35-2L,... 35-nL and the right speaker units 35-1R, 35-2R,.
The specifications of each speaker unit and the volume of the closed cabinet are almost the same for all 5-nRs. Therefore, if the left input signal and the right input signal are the same, the vibration of each speaker unit including the left and right sides is represented by the vibration of any one of the left and right speaker units. By using the vibration information of one speaker unit, the vibrations of the other speaker units on the left and right sides can also be controlled. Therefore,
Even if the number of closed speaker systems on the left and right sides increases, a vibration sensor 41 and a feedback circuit 53 common to the left and right speaker systems are provided, and the left adder / subtractor 1 is further provided.
0L, right adder / subtractor 10R, and left power amplifier 20L
And the right power amplifier 20R, it is possible to realize an MFB speaker system.

The left input signal is supplied to the left speaker system, the right input signal is a stereo signal supplied to the right speaker system, and the left input signal and the right input signal are not the same. However, the left input signal and the right input signal of the low frequency component of the stereo signal are often the same signal. For this reason, as a part of the control function of the feedback circuit 53, a low-pass filter for extracting low-frequency components of the signal from the vibration sensor 41 is provided.
With this configuration, it is possible to use the vibration information of any one of the left and right speaker units for the bass range component, thereby controlling the vibration of the other left and right speaker units. Becomes
Therefore, by providing a low-pass filter as a part of the control function of the feedback circuit 53, even if the number of the closed speaker systems on the left and right sides increases, one vibration sensor 41 common to the left and right sides is provided for the vibration sensor. In addition, only the left adder / subtractor 10L and the left power amplifier 20L for the left speaker system and the right adder / subtractor 10R and the right power amplifier 20R for the right speaker system can be applied to the stereo system. MFB that can efficiently expand the reproduction frequency band in the sound range
Speaker system.

In the ninth embodiment, the left speaker unit and the right speaker unit are connected in parallel on both the left and right sides. However, if the same connection method is used on both the left and right sides, a series connection is used. Of course, connection or series-parallel connection may be used. However, in the case of series-parallel connection, it is necessary that the input voltage to each speaker unit is the same on both the left and right sides.

As described above, according to the ninth embodiment, the left and right loudspeaker systems using a combination of a plurality of closed loudspeaker systems are provided. Use units and enclosed cabinets. A vibration sensor 4 for detecting vibration information from any one of the left and right speaker units
1 and a feedback circuit 53 including a low-pass filter for controlling a signal from the vibration sensor 41, and further adds or subtracts a signal output from the feedback circuit 53 and a left input signal or a right input signal. Left adder / subtractor 10L, right adder / subtractor 10R, and left adder / subtractor 1
A left power amplifier 20L for amplifying a signal output from 0L and driving the left speaker system and a right power amplifier 20R for amplifying a signal output from the right adder / subtractor 10R and driving the right speaker system are provided. . As a result, even when a plurality of closed speaker systems are used on the left and right sides, the vibration sensor and the feedback circuit are common to the left and right vibration sensors 41 and the feedback circuit 5.
3 and a left adder / subtracter 10L and a left power amplifier 2 for the left speaker system.
0L, right adder / subtractor 1 for right speaker system
By simply providing one 0R and one right-side power amplifier 20R, an MFB speaker system that can be applied to the stereo system and is particularly suitable for efficiently expanding the reproduction frequency band in the low frequency range is obtained.

Embodiment 10 FIG. FIG. 13 is a structural block diagram showing a configuration of the MFB speaker system according to the tenth embodiment. 13, parts that are the same as or correspond to those in FIG. 11 are given the same reference numerals, and descriptions thereof will be omitted. In the drawing, 42 is a vibration sensor common to the left and right speaker systems for detecting vibration information from any one of the speaker units of the left and right speaker systems, and 54 is a vibration sensor from the vibration sensor 42. Control the output signal and generate the feedback signal,
This is a feedback circuit common to the left and right speaker systems.

Next, the operation will be described. Regarding the left speaker system, the left input signal applied to the signal input terminal 100L is connected to the left speaker units 35-1L, 35-2L,. nL. Next, the left speaker units 35-1L, 35-2
L,... 35-nL or right speaker unit 35-1
Vibration information is detected by the vibration sensor 42 from any one of the R, 35-2R,... 35-nR, and the feedback signal generated by the feedback circuit 54 is fed back to the left adder / subtractor 10L. In the left adder / subtractor 10L, the left input signal and the feedback signal output from the feedback circuit 54 are combined, and the combined signal is combined with the left speaker unit 35-1L,
35-2L,... 35-nL are added to the left power amplifier 20L.

In the right speaker system, the right input signal applied to the signal input terminal 100R is combined with the feedback signal output from the feedback circuit 54 by the right adder / subtractor 10R, and the resultant signal is passed through the right power amplifier 20R. Right speaker units 35-1R, 35-
2R,... 35-nR.

As in the eighth embodiment, the left speaker units 35-1L, 35-2L,..., 35-nL have almost the same specifications and are connected in parallel. Further, these left speaker units 35-1L, 35-2L,.
Since -nL is attached to the common left sealed cabinet 30L, the input voltage to each speaker unit is substantially the same, that is, the vibration of each speaker unit is substantially the same for every speaker unit.

The right speaker unit 35-1R,
35-nR have substantially the same specifications, and are connected in parallel. Further, since these speaker units are attached to the common right enclosed cabinet 30R, the input voltage to each speaker unit is substantially the same, that is, the vibration of each speaker unit is substantially the same for every speaker unit.

Further, since the specifications of the speaker units of the left and right speaker systems and the volume of the closed cabinet are almost the same, the vibration of each speaker unit on both the left and right sides is caused by the input signal on the left side and the input signal on the right side. If they are the same, they will be represented by the vibration of any one of the speaker units. By using the vibration information of this one of the speaker units, the vibration of the other speaker units on the left and right sides will be common. It becomes possible to control. Therefore, even if the number of left speaker units and right speaker units increases, the vibration sensor 42 and the feedback circuit 54 common to the left and right
And a left adder / subtracter 10L and a left power amplifier 20L for the left speaker system.
And a right-side adder / subtractor 10R and a right-side power amplifier 20R for the right speaker system can realize an MFB speaker system applicable to a stereo system.

In the tenth embodiment as well, since the low-frequency component of the stereo signal often has substantially the same signal on the left and right sides, a part of the control function of the feedback circuit 54 is similar to the ninth embodiment. A low-pass filter for extracting a low-frequency component of the signal output from the vibration sensor 42 is provided so that vibration information of any one of the left and right speaker units can be used for the low-frequency component.

Therefore, by providing the low-pass filter as a part of the control function of the feedback circuit 54, even if the number of speaker units used for the left and right speaker systems increases, The number of vibration sensors 42 common to the left and right
And a feedback circuit 54. Each of the adder / subtractor and the power amplifier includes a left adder / subtractor 10L and a left power amplifier 20L for a left speaker system, a right adder / subtractor 10R and a right power Providing a single amplifier 20R has an effect of obtaining an MFB speaker system applicable to the stereo system, and particularly suitable for efficiently expanding the reproduction frequency band in the low frequency range.

Note that, as for the speaker unit connection method in the tenth embodiment, if the same connection method is used for the left and right speaker systems as in the ninth embodiment, a series connection or a series / parallel connection is also possible. It goes without saying that connection may be made, and in the case of series-parallel connection, it is necessary that the input voltage to each speaker unit is the same on both the left and right sides.

As described above, according to the tenth embodiment, a speaker system having a configuration in which a plurality of speaker units are mounted on a common closed cabinet is provided on the left and right, and speakers having substantially the same specifications on both the left and right sides. Use the unit. A feedback circuit including a vibration sensor 42 for detecting vibration information from any one of the left speaker unit and the right speaker unit, and a low-pass filter for controlling a signal output from the vibration sensor 42 54, a left adder / subtractor 10L and a right adder / subtractor 10R for adding or subtracting the feedback signal output from the feedback circuit 54 and the left input signal or the right input signal, and a signal output from the left adder / subtractor 10L. A left power amplifier 20L that amplifies and drives the left sealed speaker system, and a right adder / subtractor 10R
And a right-side power amplifier 20R for amplifying the signal output from the right side and driving the right-side closed speaker system. Therefore, even if a plurality of speaker units are used in the left and right speaker systems, only one vibration sensor and one feedback circuit need to be provided, and the left adder / subtractor 10L and the left power amplifier 20L are used for the left speaker system.
L, right adder / subtractor 10 for right speaker system
By providing only one R and one right power amplifier 20R, it is possible to obtain an MFB speaker system applicable to the stereo system, and particularly suitable for efficiently expanding the reproduction frequency band in the low frequency range.

[0087]

As described above, according to the present invention, there are provided a plurality of speaker units mounted in a closed cabinet, and the connection structure having the same input voltage to each of the speaker units has the same specification. For a speaker system to which each speaker unit is connected, vibration information of one of the speaker units is detected by a vibration sensor, and the detected vibration information is returned to an input side of the speaker system by feedback means. Since the feedback processing is performed on the input signal to the speaker system based on the vibration information, the vibration sensor and the feedback unit may be provided one by one for the speaker system. Even if the number increases, the number of vibration sensors and feedback means can be configured with a minimum,
This has the effect of avoiding complication.

According to the present invention, the speaker system has a structure in which each speaker unit connected by a connection structure having the same input voltage as the other speaker units is mounted in an independent closed cabinet having the same volume. With such a configuration, it is sufficient to provide one vibration sensor and one feedback unit for a speaker system having a structure in which each speaker unit is installed in an independent closed cabinet having the same volume. Even if the number of vibration sensors and feedback means increase, the number of vibration sensors and feedback means can be minimized, and there is an effect that size and complexity can be avoided.

According to the present invention, the loudspeaker system has a structure in which each loudspeaker unit connected by the same wiring structure as that of the other loudspeaker units is mounted in a common closed cabinet. Therefore, a speaker system having a structure in which each speaker unit is mounted in a common closed cabinet may be provided with one vibration sensor and one feedback unit. Even if the number of speaker units used increases, the vibration sensor And the number of return means can be minimized, and there is an effect of avoiding an increase in size and complexity.

According to the present invention, each of the left speaker units connected to each other in the same wiring structure so that the input voltage is the same as that of the other left speaker units is mounted in an independent left enclosed cabinet having the same capacity. And a right speaker system in which each of the right speaker units connected by a wiring structure in which the input voltage is the same as the other right speaker units is mounted in a right independent closed cabinet having the same capacity and independent from each other. As a result, even when the MFB speaker system is applied to a stereo system, the left speaker system and the right speaker system having a structure in which each speaker unit is mounted in a closed cabinet having the same volume and independent from each other. Even if the number of speaker units increases due to The number of capacitors and a feedback means can be configured with minimal, large, there is an effect of avoiding complication.

According to the present invention, the left speaker system in which each of the left speaker units connected by the same wiring structure as that of the other left speaker units are mounted in a common left enclosed cabinet, Since each of the right speaker units connected by the same wiring structure as that of the other right speaker units has a right speaker system mounted in a common right enclosed cabinet, the MFB speaker system is Even when applied to the stereo method, the number of speaker units increases in the stereo method of the left speaker system and the right speaker system in which each speaker unit is mounted in a common left closed cabinet and right closed cabinet respectively. However, the number of vibration sensors and feedback means should be minimized Can be formed, large in size, there is an effect that can be prevented from being complicated.

According to the present invention, the left speaker unit and the right speaker unit have the same specifications, and the left sealed cabinet and the right sealed cabinet have the same volume. Even if the number of vibration sensors and feedback means increase, the number of vibration sensors and feedback means can be minimized, and there is an effect that size and complexity can be avoided.

According to the present invention, a left vibration sensor for detecting vibration information of one of the left speaker units constituting the left speaker system, and a right speaker unit constituting the right speaker system A right vibration sensor that detects vibration information of one of the right speaker units, and returns vibration information detected by the left vibration sensor to an input side of the left speaker system, and an input signal to the left speaker system. A feedback means for performing feedback processing based on the vibration information, and returns the vibration information detected by the right vibration sensor to an input side of the right speaker system. Since the apparatus is provided with a right-side feedback means for performing feedback processing based on information, M Even when the B speaker system is applied to a stereo system, a left vibration sensor is provided for each of the left speaker system and the right speaker system in which each speaker unit is mounted in an independent closed cabinet having the same volume. It is sufficient to provide one left feedback means, one right vibration sensor, and one right feedback means. Even if the number of speaker units increases in a stereo system, the number of vibration sensors and feedback means can be minimized and the size can be increased. This has the effect of avoiding complication.

According to the present invention, the left and right sides for detecting vibration information of one of the left speaker units constituting the left speaker system or the right speaker units constituting the right speaker system. A vibration sensor common to the speaker system and vibration information common to the left and right speaker systems detected by the vibration sensor are returned to the input sides of the left speaker system and the right speaker system; And a feedback unit having a feedback circuit common to the left and right speaker systems for performing a feedback process based on the vibration information to an input signal to the right speaker system. Is applied to the stereo method However, it is sufficient that the left and right speaker systems have a common vibration sensor and feedback means, and even if the number of speaker units increases in a stereo system, the number of vibration sensors and feedback means is minimized. Can,
This has the effect of avoiding an increase in size and complexity.

According to the present invention, each speaker unit is connected in a parallel connection structure in which the input voltage is the same as that of the other speaker units. Therefore, even if the number of speaker units used increases, Since the input voltage of each speaker unit is the same, vibration information may be detected from one of the speaker units, and the number of vibration sensors and feedback means can be minimized, resulting in an increase in size and complexity. There is an effect that can be avoided.

According to the present invention, since each speaker unit is connected in a series connection structure in which the input voltage is the same as that of the other speaker units, even if the number of speaker units to be used increases, Since the input voltage of each speaker unit is the same, vibration information may be detected from one of the speaker units, and the number of vibration sensors and feedback means can be minimized, resulting in an increase in size and complexity. There is an effect that can be avoided.

According to the present invention, since each speaker unit is connected in a series-parallel connection structure in which the input voltage is the same as that of the other speaker units, even if the number of speaker units used increases, Since the input voltage of each of the speaker units is the same, vibration information may be detected from one of the speaker units, and the number of vibration sensors and feedback means can be minimized, resulting in an increase in size and complexity. There is an effect that can be avoided.

According to the present invention, the input voltage to each speaker unit is the same between the left speaker units, between the right speaker units, and between the left speaker unit and the right speaker unit. Since the left speaker unit and the right speaker unit are respectively connected in parallel, even if the number of speaker units used in a stereo system increases, the left speaker unit and the right speaker unit share an input signal common to the left and right speaker systems. Since the input voltage of each speaker unit is the same, the number of vibration sensors and feedback means can be minimized, and there is an effect of avoiding an increase in size and complexity.

According to the present invention, the input voltage to each speaker unit is the same between the left speaker units, between the right speaker units, and between the left speaker unit and the right speaker unit. Since the left speaker unit and the right speaker unit are respectively connected in series, even if the number of speaker units used in a stereo system increases, the left speaker unit and the right speaker unit share an input signal common to the left and right speaker systems. Since the input voltage of each speaker unit becomes the same, the number of vibration sensors and feedback means can be minimized, and there is an effect that size and complexity can be avoided.

According to the present invention, the input voltage to each speaker unit is the same between the left speaker units, between the right speaker units, and between the left speaker unit and the right speaker unit. Since the left speaker unit and the right speaker unit are connected in series and parallel, respectively, even if the number of speaker units used in a stereo system increases, the left speaker unit and the right speaker unit share an input common to the left and right speaker systems. Since the input voltage of each speaker unit is the same for signals, the number of vibration sensors and feedback means can be minimized, and
This has the effect of avoiding complication.

[Brief description of the drawings]

FIG. 1 is a structural block diagram showing a configuration of an MFB speaker system according to Embodiment 1 of the present invention.

FIG. 2 is a structural block diagram showing a configuration of an MFB speaker system according to Embodiment 2 of the present invention.

FIG. 3 is a structural block diagram showing a configuration of an MFB speaker system according to Embodiment 3 of the present invention.

FIG. 4 is a connection diagram showing a connection configuration when four speaker units are used in an MFB speaker system according to Embodiment 3 of the present invention.

FIG. 5 is a connection diagram showing a connection configuration when six speaker units are used in the MFB speaker system according to Embodiment 3 of the present invention.

FIG. 6 is a connection diagram showing a connection configuration when eight speaker units are used in the MFB speaker system according to Embodiment 3 of the present invention.

FIG. 7 is a structural block diagram showing a configuration of an MFB speaker system according to Embodiment 4 of the present invention.

FIG. 8 is a structural block diagram showing a configuration of an MFB speaker system according to Embodiment 5 of the present invention.

FIG. 9 is a structural block diagram showing a configuration of an MFB speaker system according to Embodiment 6 of the present invention.

FIG. 10 is a structural block diagram showing a configuration of an MFB speaker system according to Embodiment 7 of the present invention.

FIG. 11 is a structural block diagram showing a configuration of an MFB speaker system according to an eighth embodiment of the present invention.

FIG. 12 is a structural block diagram showing a configuration of an MFB speaker system according to Embodiment 9 of the present invention.

FIG. 13 is a structural block diagram showing a configuration of an MFB speaker system according to Embodiment 10 of the present invention.

FIG. 14 is a circuit block diagram illustrating a configuration example of a conventional MFB speaker system.

FIG. 15 is a structural block diagram showing a conventional MFB speaker system.

FIG. 16 shows a conventional M using a plurality of speaker units.
FIG. 2 is a structural block diagram illustrating a configuration example of an FB speaker system.

[Explanation of symbols]

Reference Signs List 10 adder / subtractor (feedback means), 10L left adder / subtractor (left feedback means), 10R right adder / subtractor (right feedback means), 20 power amplifier (feedback means), 20L
Left power amplifier (left feedback means), 20R Right power amplifier (right feedback means), 30, 30-1, 30
-2 ..., 31 Closed cabinet, 30L, 30-1
L, 30-2L ... Left side closed cabinet, 30R,
30-1R, 30-2R ... Right side closed type cabinet,
35-1, 35-2 ... speaker unit, 35-1
L, 35-2L ... Left speaker unit, 35-1
R, 35-2R ... right speaker unit, 40, 4
1,42 vibration sensor, 40L left vibration sensor, 40
R right vibration sensor, 50 feedback circuit (feedback means),
50L Left feedback circuit (left feedback means), 50R Right feedback circuit (right feedback means), 53, 54 Feedback circuits common to left and right speaker systems.

Continuation of the front page F term (reference) 5D011 AD01 5D018 AF22 5D020 AD06 CD03 CD04 5J100 AA09 AA24 HA07 LA08

Claims (14)

[Claims] 1. An MFB speaker system for returning vibration information of a speaker unit to an input side of the speaker unit, wherein the MFB speaker system includes a plurality of speaker units mounted in a closed cabinet, and an input voltage to each speaker unit is reduced. A speaker system in which the respective speaker units having the same connection structure and the same specifications are connected, a vibration sensor for detecting vibration information of one of the speaker units constituting the speaker system, and the vibration sensor Feedback means for returning the vibration information detected by (1) to the input side of the speaker system, and performing feedback processing on the input signal to the speaker system based on the vibration information. 2. The speaker system has a structure in which each speaker unit connected by a wiring structure having the same input voltage as that of another speaker unit is mounted in an independent closed cabinet having the same volume. The MFB speaker system according to claim 1, wherein: 3. The speaker system has a structure in which each speaker unit connected by a wiring structure having the same input voltage as other speaker units is mounted in a common closed cabinet. The MFB speaker system according to claim 1, wherein 4. The speaker system is a left and right speaker system of a stereo system, wherein the left speaker system is connected to each of the left speakers in a connection structure in which an input voltage is the same as that of another left speaker unit. The right speaker system has a structure in which the units are mounted in independent left-side closed cabinets having the same volume, and the right speaker system is connected in a connection structure in which the input voltage is the same as that of the other right speaker units. 2. The MFB speaker system according to claim 1, wherein each of the units has a structure in which the units are mounted in independent right-side closed cabinets having the same volume. 5. The speaker system is a left speaker system and a left speaker system in a stereo system. The left speaker system is connected to each of the left speakers connected in a connection structure in which the input voltage is the same as the other left speaker units. The right speaker system has a structure in which the units are mounted in a common left-side closed cabinet, and the right speaker system uses a common connection structure in which the input voltage is the same as that of the other right speaker units. 2. The MFB speaker system according to claim 1, wherein the MFB speaker system has a structure mounted in a right-side closed cabinet. 6. The left speaker system and the right speaker system, wherein the specifications of the left speaker unit and the right speaker unit and the volumes of the left sealed cabinet and the right sealed cabinet are the same. Or the MFB speaker system according to claim 5. 7. A left vibration sensor for detecting vibration information of one of the left speaker units constituting the left speaker system, and a right speaker unit constituting the right speaker system. And a right vibration sensor for detecting vibration information of one of the right speaker units.
Returning the vibration information detected by the left vibration sensor to the input side of the left speaker system, and performing a feedback process based on the vibration information on an input signal to the left speaker system; and the right vibration sensor And right-side feedback means for returning the vibration information detected by (1) to the input side of the right-side speaker system and performing a feedback process based on the vibration information on an input signal to the right-side speaker system. The MFB speaker system according to any one of claims 4 to 6. 8. The vibration sensor detects vibration information of one of the left speaker units constituting the left speaker system or one of the right speaker units constituting the right speaker system. A speaker system common vibration sensor, the feedback means returns the vibration information common to the left and right speaker systems detected by the vibration sensor, to the input side of the left speaker system and the right speaker system, Feedback means comprising a feedback circuit common to the left and right speaker systems, which performs feedback processing based on the vibration information on input signals to the left speaker system and the right speaker system. The MFB speaker system according to claim 6. 9. The speaker system according to claim 1, wherein each speaker unit of the speaker system is connected in a parallel connection structure in which an input voltage is the same as that of another speaker unit. Item 8. The MFB speaker system according to Item 1. 10. The speaker system according to claim 1, wherein each speaker unit of the speaker system is connected in a series connection structure in which an input voltage is the same as that of another speaker unit.
The MFB speaker system according to any one of claims 1 to 3. 11. The loudspeaker system according to claim 1, wherein each loudspeaker unit of the loudspeaker system is connected in a series-parallel connection structure in which an input voltage is the same as that of another loudspeaker unit. 2. The MFB speaker system according to claim 1. 12. The left speaker units of the left speaker system are connected in a parallel connection structure in which the input voltage is the same as that of the other left speaker units, and the right speaker units of the right speaker system have other input voltages. 9. The MFB speaker system according to claim 7, wherein the right speaker unit and the left speaker unit of the left speaker system are connected in the same parallel connection structure. 13. The left speaker units of the left speaker system are connected in a serial connection structure in which the input voltage is the same as the other left speaker units, and the right speaker units of the right speaker system have the other input voltages. 9. The MFB speaker system according to claim 7, wherein the right speaker unit and the left speaker unit of the left speaker system are connected in the same series connection structure. 14. The left speaker units of the left speaker system are connected in a series-parallel connection structure in which the input voltage is the same as the other left speaker units, and each right speaker unit of the right speaker system has an input voltage of 9. The MFB speaker system according to claim 7, wherein the MFB speaker system is connected in the same series-parallel connection structure as the other right speaker unit and each left speaker unit of the left speaker system.