close

Вход

Забыли?

вход по аккаунту

?

JPS5542419

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 JPS5542419
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram of a conventional MFB-type
loudspeaker speaker, FIG. 2 is a diagram of the MFB-type loudspeaker speaker of the present
invention, and FIG. 3 is a detected voltage-frequency characteristic diagram. 1 is a drive coil, 2 is
a detection coil, 4 is a low pass filter, and 3 is a drive amplifier.
DETAILED DESCRIPTION OF THE INVENTION In the present invention, a low-pass filter is
inserted in the IMFB feedback circuit in connection with the improvement of the MFB speaker
system μ (from C, the influence of the induced lightning l: E generated in the detection coil is
prevented), in particular The purpose is to control large amplitude operation at low frequency. A
conventional common MFB speaker device will be described with reference to FIG. 1. Reference
numeral 1 denotes a drive coil for driving the driver amplifier 3 audio signal manually (7, and a
detection coil 2 for detecting the vibration of the drive coil 1) Equipped with The detection
voltage of the detection coil 2 is fed back to the drive amplifier 3 in reverse phase to electrically
control the ro, Q-amplitude of the speaker system 12, and the imaging system in the history 12
Improve non-linear distortion including The detection coil 2 is wound around the drive coil 1 and
arranged in the same magnetic field, and a magnetic circuit for the detection coil 2 is provided
opposite to the magnetic / U path of the small motion coil 1. And the drive coil 1 are
mechanically connected 1 to detect the imaging movement of the drive coil 1 or to use the
change of electrostatic 8 検 出, the one to be detected optically, etc. . In such a conventional MFB
speaker device, it is necessary to add a separate detection means, so parts, assembly man-hours,
etc. are required (a cause of an increase in product cost. On the other hand, the drive coil 1 and
the detection coil 2 are coaxially wound and disposed in the same magnetic iol path. In the case
of Q, there is an advantage that almost no additional parts are required, but the induced voltage
32 due to the phase 4 induction of both coils is superimposed, and this voltage becomes a
constant wave number plate.比例 Proportionate to the vibration of the sensor [Fig. 3] which is
larger than the voltage 31 (Fig. 3)-It is difficult to detect an accurate detection voltage, and to
12-05-2019
1
perform an accurate MFB operation. The This device focuses on the amplitude suppression 1
function especially in the MFB speaker system, the purpose of which is to suppress the largewidth operation at the time of low-pass by inserting a low pass filter into the S-1, MFB feedback
circuit. The effect of the voltage is eliminated 1 and only the voltage proportional to the vibration
of the drive coil l is fed back to obtain the result, which will be described in detail in the following
description of the embodiment shown in FIG. Reference numeral 2 denotes a drive amplifier for
supplying an audio signal to the drive coil 1, and 2 denotes a detection coil wound coaxially with
the drive coil 1 and disposed in the same magnetic circuit. The voltage detected by the detection
coil 2 is fed back via the low pass filter 4 to the driving amplifier 3. The low pass filter カ ッ ト
cutoff zen + 4 fel substantially coincides with the frequency at which the voltage due to mutual
induction becomes larger A than the voltage proportional to the vibration of the drive coil l.
For example, according to experiments, it was about fc = 50 Hz in a 31 eM aperture speaker (fo =
30 Hz). However, when a signal lower than the drive coil Kfe is manually input, a voltage
proportional to the vibration of the drive coil l) as the detection voltage c 発 生 generated in the
detection coil 2 passes through the low-pass filter and is transmitted to the drive amplifier It is
fed back and exhibits a band suppression action by the MFB action. On the other hand, when a
signal higher than fc is input, the detection voltage c main and 1-induced voltage are mutually
eliminated by the low pass filter 4 and therefore no MFB operation is exhibited, and the drive coil
l is operating only with an audio signal Ru. As described above, according to the present
invention, there is provided an MFB type loudspeaker speaker device in which a voltage detected
by the detection coil 2 wound coaxially with the drive coil 1 is fed back to the drive amplifier 8.
Corresponds to the vibration of the drive coil l by inserting a low pass filter into the circuit. It is
possible to suppress the over-amplitude in the .DELTA. Low range operation by exhibiting the
MFB operation only in the low range operation where the detected voltage can be obtained. On
the other hand, during high-frequency operation where there is no need for the effect of
suppressing the image width, the voltage due to mutual induction generated in the detection coil
1 is removed by the low pass filter 4 and MFBv does not exhibit, and only the audio signal Driven
by Therefore, the suppression of the large amplitude operation in the low range is extremely
effective, and it is extremely useful in practical use, for example, to significantly reduce the
adverse effect due to the mutual induction of the coils and to leave.
12-05-2019
2
Документ
Категория
Без категории
Просмотров
0
Размер файла
10 Кб
Теги
jps5542419
1/--страниц
Пожаловаться на содержимое документа