close

Вход

Забыли?

вход по аккаунту

?

JPH05199584

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 JPH05199584
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
floor-standing type foot monitor speaker system used to feed back necessary audio signals to
speakers and musicians at, for example, lectures and concerts.
[0002]
2. Description of the Related Art Conventionally, in the above-mentioned foot monitor speaker
system, focusing only on the acoustic characteristics emitted directly to the speaker or musician
from the speaker itself, the sound pressure-frequency characteristic is flat near the center of the
curve shown in FIG. It was adjusted to become.
[0003]
Also, the improvement to flatten the frequency characteristics (amplitude, phase) of the direct
sound was evaluated on the sound quality based on the data on the front axis in the anechoic
chamber.
[0004]
However, when this speaker system is disposed on the floor, in the listening position, not only the
direct sound A from the speaker but also the reflected sound B on the floor surface as shown in
FIG. Because the sound waves of the direct sound A and the reflected sound B are generated in
08-05-2019
1
phase, as a result, a dip (valley) is generated in the middle and low range as shown by the dotted
line in FIG. In the low frequency band, there is a problem of increasing.
How this floor reflection affects direct sound (how it happens like dips) depends on the listening
position, the position of the speaker unit, the diaphragm aperture and the elevation angle (the
angle the baffle plate on the surface on which the speaker unit is attached to the floor) However,
with this type of speaker system (generally 35 degrees to 60 degrees with a 1 to 3 way system
with a diameter of 25 cm to 38 cm woofer), dips that are not preferred in the band as shown in
FIG. Make it happen.
[0005]
The present invention is made in view of the above-mentioned subject, and an object of the
present invention is to provide a foot monitor speaker system which can give feedback with
reproduction sound preferred for a listener.
[0006]
SUMMARY OF THE INVENTION The present invention is a floor-mounted type foot monitor
speaker system in which a dip occurs in sound pressure at a specific frequency by combining
direct sound and reflected sound from the floor. Is provided relatively to other frequencies than
the other.
[0007]
According to the present invention, in the floor-standing type foot monitor speaker system in
which a dip occurs in the sound pressure at a specific frequency by combining the direct sound
and the reflected sound from the floor, the electrical correction means relatively compares the
sound pressure at the specific frequency. Higher than the other frequencies.
[0008]
A first embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram of one embodiment of a two-way foot monitor speaker in a multiamplifier configuration.
08-05-2019
2
Here, the multi-amplifier configuration means that the signals to be supplied to the low-range
speaker and high-range speaker are separated in advance before passing through the amplifier,
and then amplified by the two (or more) amplifiers. Drive.
[0009]
In FIG. 1, 1 is a low pass filter, 2 is a high pass filter, 3 is a floor correction equalizer as electrical
correction means, 4 is a horn equalizer, 5 is a changeover switch, 6 and 7 are amplifiers, 8 is a
woofer, and 9 is a tweeter. .
[0010]
In FIG. 1, the input signal is divided into bands by the low pass filter 1 and the high pass filter 2,
and the floor correction equalizer 3 is inserted on the low pass filter 2 side to correct the
influence of the floor reflection.
The changeover switch 5 is for passing the floor correction equalizer 3 when the correction is
not required (for example, when installed at a place other than the floor surface).
In addition, the horn equalizer 4 on the high pass filter 2 side has a function of lifting the high
frequency portion of the frequency characteristic.
Then, the signals are amplified by the respective amplifiers 6 and 7, and the woofer 8 and the
tweeter 9 emit sounds.
[0011]
FIG. 2 shows an example of the circuit in the X section of FIG. In FIG. 2, this floor correction
equalizer 3 uses an active filter, and has a configuration in which a band pass filter is disposed at
the front stage and a differential amplifier is disposed at the rear stage. FIG. 3 shows a frequency
characteristic in which the before-correction by the equalizer 3 is indicated by a dotted line and
the after-correction by a solid line. As shown in FIG. 3, the floor correction equalizer 3 eliminates
the dip.
08-05-2019
3
[0012]
Furthermore, the present invention can be realized without using a multi-amplifier configuration.
That is, in the second embodiment of FIG. 4, the signal from the source is first amplified by the
amplifier 10, and band division is performed by the low pass filter 1 and the high pass filter 2.
The high frequency component from the high pass filter 2 is amplified as it is from the tweeter 9,
but the low frequency component from the low pass filter 1 is corrected by the floor correction
equalizer 3 in the same manner as in FIG. .
[0013]
FIG. 5 is a block diagram of a third embodiment in which a full range speaker is used. In FIG. 5,
the signal from the source is first amplified by the amplifier 10 and supplied to the full range
speaker 11 through the floor correction equalizer 3. FIG. 6 is also a block diagram of a fourth
embodiment in which a full range speaker is used. The difference from FIG. 5 is that the
arrangement of the amplifier 10 and the floor correction equalizer 3 is reversed. That is, in FIG.
6, the signal from the source is first passed through the floor correction equalizer 3, amplified by
the amplifier 10, and supplied to the full range speaker 11.
[0014]
In each embodiment, an active filter is used as the electrical correction means, but a passive filter
consisting of a passive circuit may be used.
[0015]
Also, the characteristics of the floor correction equalizer 3 used in each embodiment may be such
that the portion of the dip in FIG. 11 is lifted as shown in FIG. 7, or as shown in FIG. The
characteristic may be such that it has the characteristic of attenuating the peak, and also has the
characteristic of flattening the mountain portion of FIG. 11 as shown in FIG.
That is, it may be a characteristic to lift the dip portion relatively.
08-05-2019
4
[0016]
According to the present invention, since the electrical correction means relatively increases the
sound pressure at a specific frequency than other frequencies, it is possible to provide feedback
with a reproduced sound preferable to the listener.
08-05-2019
5
Документ
Категория
Без категории
Просмотров
0
Размер файла
12 Кб
Теги
jph05199584
1/--страниц
Пожаловаться на содержимое документа