close

Вход

Забыли?

вход по аккаунту

?

JPS60150400

код для вставкиСкачать
Patent Translate
Powered by EPO and Google
Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPS60150400
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
motional feedback type speaker apparatus equipped with a bridge type speed detection circuit.
BACKGROUND OF THE INVENTION Conventionally, the bass reproduction range of a small
speaker is expanded. As a device for reducing distortion, a device has been proposed in which a
bridge-type speed detection circuit is provided, speed feedback is applied to the speaker, and the
low-frequency boost circuit expands the low frequency. A block diagram of this device is shown
in FIG. Hereinafter, the operation of this apparatus will be described with reference to the
drawings. In FIG. 1, 1 is an input terminal, 2 is a low pass boost circuit, 3 is a subtractor, and 4 is
a power amplifier. 5.6 'and 7 are impedance elements constituting a bridge circuit, 8 is a speaker
unit, 9 is a differential amplifier, 10 is a feedback circuit, 11 is a control amplifier, 12 is a
speaker system, and 13.14 is a control amplifier output terminal , 15.16 are speaker system
input terminals, and 17.18 are speaker cables. The input signal from the input terminal 1 is
manually input to the power amplifier 4 through the low-pass boost circuit 2 and the subtracter
5, and the output of the power amplifier 4 is added to the bridge circuit consisting of the speaker
unit 8 and impedance elements 5 and 6.7. Be By adjusting the values of the impedance elements
5 and 6.7 of the bridge circuit, a voltage proportional to the vibration speed of the vibration
system (voice coil) of the speaker unit 8 is generated between the differential inputs of the
differential amplifier 9. This voltage is amplified to a desired magnitude by the differential
amplifier 9, the width and phase of the speed signal are adjusted by the two feedback circuits 10
that input to the feedback circuit 10, and the speed feedback is input to the subtractor 3. Do. In
FIG. 2, assuming that the sound pressure frequency characteristic of the speaker unit 8 before
the speed feedback is as shown by 21, the sound pressure frequency characteristic changes to
21 'by the speed feedback. At this time, the input voltage to the speaker unit 8 changes from 19
to 19 'by speed feedback. When the low range boost indicated by 20 is performed by the low
08-05-2019
1
range boost circuit 2, the input voltage to the speaker unit 8 changes to 19 'and the sound
pressure frequency characteristic of the speaker changes to 21'. As described above, it is possible
to expand the bass reproduction range while performing the speed feedback to reduce the
distortion. However, this device has the following problems. One of the problems is that the
characteristics of the velocity feedback change due to the influence of the impedance of the
speaker cable 17.18, and the distortion reduction effect tends to be insufficient. This cause will
be described with reference to FIG. FIG. 3 is a view in which the portion of the bridge circuit in
FIG. 1 has been removed.
In FIG. 3, 22 is a drive voltage source, 23 is a counter electromotive voltage source, and 24 is an
element equivalent to the impedance of the speaker cable 17.18. The speaker unit 8 can be
regarded as equally restricted as being constituted of the stop impedance element 8 ? and the
back electromotive voltage source 23. In FIG. 3, an equilibrium condition in which no voltage is
generated by the drive voltage source 22 between the point X and the point Y is expressed by
equation (1). (Z's + Z24) и z, = z и и и и и и и и и и и и и и (1) where% Z '8: impedance Z of the impedance
element 8 Z Z Z: impedance element It is an impedance of 5, 6 5,6 7 impedance of the impedance
element of Z24 two-speaker couple. ??????????????????? Since it changes
with use conditions, such as the length of a cable, it is difficult to always establish equilibrium
condition (1) Formula. If equation (1) does not hold, both voltages from back voltage source 25
and drive voltage source 22 proportional to the velocity signal will overlap between points X and
Y, and the velocity signal will be distorted. The distortion reduction effect by the speed feedback
is reduced. Although it is possible to design in consideration of the impedance Z24 of the speaker
cable, it is not preferable because it limits the use condition. Another problem is that the speaker
systems are not compatible. Since the stop impedance Z '8 of the speaker unit 8 differs
depending on the model, the impedance element 56.7 satisfying the balance condition (1) varies
depending on the model. Therefore, there is a drawback that the control amplifier 11 adjusted
for one speaker system can not be connected to another speaker system. OBJECTS OF THE
INVENTION The object of the present invention is to eliminate the above-mentioned drawbacks
of the prior art, to be affected by the cable impedance of the speaker, to provide stable speed
feedback, and to be compatible with the speaker system. To provide a speaker device of
SUMMARY OF THE INVENTION In order to achieve the above object, the speaker device of the
present invention is provided with a bridge circuit in the speaker system, and the bridge circuit
to the control amplifier are connected by a signal cable. DETAILED DESCRIPTION OF THE
PREFERRED EMBODIMENT An embodiment of the present invention will be described below with
reference to the drawings. FIG. 4 is a block diagram showing a speaker device as an embodiment
of the non-invention, and the speaker device shown in FIG. 4 has impedance elements 5 and 6.7
in comparison with those shown in FIG. The difference is that it has moved into the loudspeaker
system 12 '.
08-05-2019
2
In FIG. 4, 16 'is a speaker output terminal of control amplifier 11', 26.27 is a differential input
terminal, 25.28 is a ground terminal, 29jO is a bridge circuit output terminal, and 15 'is an input
terminal of speaker system 12'. , 32.33 is a bridge circuit cable 31 and 31 (a ground cable. The
bridge circuit portion of FIG. 4 is shown in FIG. 5 similarly to FIG. The equilibrium condition in
which no voltage is generated by the drive voltage source 22 between the X point and the Y
point is expressed by equation (1) ?, and the influence of the cable impedance of the speaker is
eliminated. z ', z6-z, ... Z7 .......... (1)' The impedance element 24 'of the output cable of the bridge
circuit is of the differential amplifier 9 Although it intervenes up to human power, the change in
the signal due to this impedance is in phase, so the change in this signal can be eliminated by the
differential amplifier 9. As described above, since the influence of the cable impedance can be
eliminated from the balanced condition of the bridge circuit, the distortion reduction effect by
the speed feedback can be stably exerted. In addition, since a bridge circuit is provided in the
speaker system, one control amplifier can be used in connection with a speaker system
incorporating a bridge circuit of a child's bridge, which enables compatibility between the
speaker systems. . As described above, according to the present invention, in the motional
feedback type speaker apparatus having the bridge type speed detection circuit, the influence of
the cable impedance can be eliminated from the balance condition of the bridge circuit, so that
the speed can be reduced. There is an effect that the distortion reduction effect by feedback can
be stably exerted. In addition, since the bridge circuit is provided in the speaker system, the
compatibility between the speaker systems incorporating the bridge circuit becomes possible,
which has an effect of increasing the economic efficiency.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a block diagram showing an example of a conventional motional feedback type speaker
device, FIG. 2 is a characteristic diagram showing frequency characteristics for explaining the
operation principle of FIG. 1, and FIG. 3 is 1 is a circuit diagram showing the bridge circuit of FIG.
1, FIG. 4 is a block diagram showing an embodiment of the speaker apparatus of the present
invention, and FIG. 5 is a circuit diagram showing the bridge circuit of FIG.
1ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии
и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и иии Impedance element, 8 и и и и и и и Speaker unit, 9 и и и и и и и и и
и и и и и и и и и и и и и и и и и и и и и и и и и и и и и feedback circuit, 11.1 '1' song и и и control amplifier, 12 .12 'ииииии
Speaker system, 13, i5 ?, 14 ииииии Control amplifier output terminal, 15, i5 ?, 16 иииии Loud
08-05-2019
3
speaker system input terminal, 17.17 ?, 18 Mountain: speaker cable, jfat figure 2 figure fs f = h
periodic liquid figure 3 figure
08-05-2019
4
Документ
Категория
Без категории
Просмотров
0
Размер файла
12 Кб
Теги
jps60150400
1/--страниц
Пожаловаться на содержимое документа