close

Вход

Забыли?

вход по аккаунту

?

JPS63204997

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 JPS63204997
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
audio signal reproducing apparatus that performs low-tone, strong bass in the field of acoustic
products. 2. Description of the Related Art In recent years, high-quality devices have been
required in the field of audio products, particularly cassette players with radio receivers, as audio
signal reproduction devices for bass sound. Hereinafter, an example of a conventional audio
signal reproduction apparatus for bass loudness will be described with reference to the drawings.
FIG. 3 shows a conventional bass sound signal reproduction apparatus. In FIG. 3, 1 is a voltage
amplification circuit, 6 is an output terminal of the voltage amplification circuit 1, and 7 is a
negative feedback input terminal of the voltage amplification circuit 1. R1 is a resistor connected
from the output terminal 6 of the voltage amplification circuit 1 to the negative feedback input
terminal 7, and the negative feedback input terminal 7 is grounded via a series resonant circuit
of a capacitor C, a resistor R2 and a simulated inductor 6. The simulated inductor 5, which is
known, is composed of an operational amplifier circuit 4, resistors R3 and R4 and a capacitor C2,
and the inductance L at this time is Ls = C2 · R3 · R4. On the other hand, the output of the voltage
amplification circuit 1 is connected to one fixed terminal of the volume control VR, the other
fixed terminal of the volume control VR1 is grounded, and the movable terminal of the volume
control VR1 is connected to the voltage amplification circuit 2 . Further, the output of the power
amplification circuit 2 is input to the precision loudspeaker system 10. 8 is a speaker unit of the
close-packed speaker system 10. The operation of the playback apparatus configured as
described above will be described below. The gain of the voltage amplification circuit 1 is
determined by the ratio of the impedance LS and R1 of the series resonant circuit of the
capacitor C1, the resistor R2 and the simulated inductor 5, and the resonance frequency f as
shown in FIG. At 1 / 2π 耳 ン と な り と な り, it becomes a band-pass type frequency
characteristic in which a peak is generated in the gain, and by selecting the resonance frequency
08-05-2019
1
f as the frequency band of the bass region, the low frequency signal reinforced by the bass is
power amplified The circuit 2 is applied to the precision loudspeaker system 10. Problems to be
Solved by the Invention However, in the above-described configuration, the amplitude of the
diaphragm of the speaker unit 8 in the low frequency range is lowered in frequency as shown in
FIG. The amplitude is increased in accordance with the equation and becomes substantially
constant at frequencies lower than the lowest resonance frequency fo of the close-packed
speaker system 10. For this reason, when a bass-strong low frequency signal having a frequency
characteristic as shown in FIG. 4 is applied to the dense speaker system 1o, the amplitude of the
diaphragm of the speaker unit 8 at the resonance frequency f is Extremely large distortion occurs
in the speaker unit 8 and high quality bass and tension reproduction can not be performed, and
the distortion increases as the volume is larger and as the aperture of the speaker unit 8 is
smaller. It had the problem of.
In view of the above problems, the present invention reduces the amplitude of the diaphragm of
the speaker unit and reduces distortion generated in the speaker unit when high frequency low
frequency signals are applied, thereby achieving high-quality high-intensity bass An audio signal
reproduction device capable of realizing a reproduction system is provided. Means for Solving
the Problems In order to solve the above problems, the audio signal reproduction device of the
present invention is configured to obtain high gain in a relatively narrow frequency band of the
bass region as compared to other frequency bands. A band-pass voltage amplification circuit, a
volume control for adjusting the volume by dividing the output of the band-pass voltage
amplification circuit, and a power amplification circuit having a voltage adjusted by the sound
volume as an input And a phase inversion type speaker system driven by the output of the power
amplification circuit, wherein the pass band frequency of the band pass type voltage
amplification circuit and the antiresonance frequency by the phase inversion mechanism in the
phase inversion type speaker system It is equipped with the structure of making it correspond.
Operation The present invention utilizes the feature of the phase inversion type speaker system
in which the amplitude of the diaphragm of the speaker unit at the antiresonance frequency is
reduced as compared with the close speaker system by the above-described configuration. It is
possible to match the pass band frequency of the band pass type voltage amplification circuit, to
reduce the amplitude of the speaker unit in a bass-enhanced frequency signal, and to reduce
distortion generated in the speaker unit. Embodiment An audio signal reproducing apparatus for
bass loudness according to an embodiment of the present invention will be described with
reference to the drawings. FIG. 1 shows an audio signal reproducing apparatus for bass loudness
according to an embodiment of the present invention. 1 differs from the configuration of FIG. 3
in the speaker system. Reference numeral 3 denotes a drone cone type phase inversion type
speaker system, 8 denotes a speaker unit, and 9 denotes a drone cone, which is driven by the
output of the power amplification circuit 2. Also, the anti-resonance frequency f due to the drone
cone of the phase inversion type speaker system 3. Is required in 1.2. Where a is the radius (cm)
of the imaging plate of the speaker unit 8, V is the volume (cril) of the phase inversion speaker
08-05-2019
2
system 3, and md is the mass (q) of the drone cone. Here, the anti-resonance frequency fr and the
resonance frequency f of the series resonance circuit of the voltage amplification circuit 1 are
configured to coincide with each other. The operation of the sound signal reproducing apparatus
for bass sound with the above-described configuration will be described below with reference to
FIGS. 1, 2 and 4.
The frequency characteristic of the gain of the voltage amplification circuit 1 is the same as that
of the conventional example, and the frequency characteristic of the band pass type as shown in
FIG. 4 is obtained. Low frequency signal is applied. The amplitude of the diaphragm of the
speaker unit 8 of the phase inversion type speaker system 3 increases as the frequency
decreases as shown in FIG. 2, but the amplitude decreases near the antiresonance frequency fr.
Therefore, by matching the resonance frequency f of the series resonance circuit of the voltage
amplification circuit 1 with the antiresonance frequency fr, the resonance frequency f of the
series resonance circuit. Since the amplitude of the diaphragm of the speaker unit 8 may be small
even if a low frequency signal with strong bass is applied to the phase inversion type speaker
system 3 in the vicinity, distortion hardly occurs from the speaker unit 8. Therefore, high-quality
bass and tension reproduction with little distortion up to a large volume is possible. As described
above, according to the present embodiment, the resonance frequency f of the series resonance
circuit of the voltage amplification circuit 1 and the antiresonance frequency f, which are central
values of the passband frequency of the band-pass voltage amplification circuit, are matched. By
providing the phase inversion type speaker system 3, even if a low frequency boosted low
frequency signal is applied to the phase inversion type speaker system 3, high-quality bass sound
reproduction with little distortion up to a large volume is possible. In the embodiment, the drone
cone type is used as the phase inversion speaker system, but a duct type phase inversion speaker
system may be used. Although a simulated inductor is used as the inductor of the series resonant
circuit, a coiled inductor may be used. As described above, according to the present invention, the
passband frequency and phase of a band pass type voltage amplification circuit configured to
obtain high gain in a relatively narrow frequency band of a bass range as compared to other
frequency bands. By matching the anti-resonance frequency of the inverted speaker system, highquality bass-strong reproduction with less distortion up to a large volume is realized even if a
low-intensity bass signal is applied to the phase-inverted speaker system it can.
[0002]
Brief description of the drawings
[0003]
08-05-2019
3
FIG. 1 is a block diagram of an audio signal reproducing apparatus according to an embodiment
of the present invention, FIG. 2 is an amplitude characteristic diagram of a diaphragm of a
speaker unit of the phase inversion type speaker system of FIG. FIG. 4 is a block diagram of the
reproducing apparatus, FIG. 4 is a frequency characteristic diagram of the voltage amplification
circuit in FIG. 3, and FIG. 5 is an amplitude characteristic diagram of a diaphragm of the speaker
unit of the precision page speaker system in FIG.
1 · · · Voltage amplification circuit, 2 · · · Power amplification circuit, · · · · · · · Phase inversion type
speaker system, 4 · · · Operational amplifier, 5 · · · · · Simulated inductor, 8 · · · · · · · Speaker unit, 9
· · · · Dron cone, R 1, R 2 ・ RR · · · · · · · · · · · · · · · · · · · · · · · · · · capacitor, 3 '4 ■ R1 · · · · · · · ·
Volume. Name of Agent Attorney Nakao Toshio and 1 other person Minami Maki-'' '' 'Figure 3 /
Figure 4 θ! Number of waves-'' 8
08-05-2019
4
Документ
Категория
Без категории
Просмотров
0
Размер файла
12 Кб
Теги
jps63204997
1/--страниц
Пожаловаться на содержимое документа