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JP2001292490

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DESCRIPTION JP2001292490
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
crossover point setting device for a plurality of loudspeakers, and more particularly, at least two
loudspeakers among a loudspeaker for high frequency, a loudspeaker for mid frequency and a
loudspeaker for low frequency. The present invention relates to a frequency characteristic setting
device for setting frequency characteristics so as to prevent interference between the speakers in
the provided acoustic system.
[0002]
2. Description of the Related Art In an audio system, high frequency speakers, mid frequency
speakers and low frequency speakers may be installed. In such an acoustic system, in order to
prevent mutual interference by each speaker and obtain a high-quality voice output, signal
components other than the frequency band covered by each speaker are cut in advance using a
filter. ing. And, the setting of the frequency characteristics of the filter for cutting out the signal
components out of the band is based on the skilled engineer measuring the actual sound output
from the sound system when the speaker is actually installed, The filter frequency characteristics
are set so that the pass bands of the respective speakers do not overlap. However, when the filter
frequency characteristics are set empirically by a technician, the quality of the sound reproduced
in the acoustic system depends on the ability of the technician due to the skill level etc. Even
when trying to adjust the frequency characteristics of the filter, the desired voice quality is often
not obtained. Moreover, even if desired voice quality is obtained, it takes a lot of time to set the
frequency characteristics of the filter.
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1
[0003]
There is also proposed a method of appropriately setting frequency characteristics of signals
supplied to each speaker on a monitor screen of a computer in an audio system provided with
speakers for each of low, middle and high regions. In this method, a desired frequency
characteristic is digitally obtained by a digital signal processor (DSP), and the frequency
characteristic is shown in (A) to (C) of FIG. A graph showing the frequency characteristics for
each of the middle and high frequency bands is displayed on the monitor screen, and the gain
adjustment operator Cg arranged on the graph is moved up and down, and the cutoff frequency (
The setting is made by moving the control Ccut for setting the frequency of -3 dB to the left and
right. Such setting of the frequency characteristic by the DSP can be made by visually changing
and adjusting the characteristic curve by the movement of the manipulator, so that the frequency
characteristic of each band can be easily set.
[0004]
However, in the method of setting the frequency characteristic of the signal to the speaker by the
DSP according to the conventional example, as shown in FIG. 5, only the frequency characteristic
of one band can be displayed on the monitor screen. It can not be set while comparing frequency
characteristics. Therefore, for example, the graph of the frequency characteristic for the low
frequency band as shown in FIG. 5A is read out on the monitor screen, the gain and the cutoff
frequency are set by the movement of the operator, and then It is necessary to read out the
middle and high frequency graphs as shown in B) and (C) sequentially on the monitor screen and
to set the gain and the cutoff frequency in the same manner. In addition, since changing the
frequency characteristic of a certain band causes the frequency characteristic of the other band
to be affected, it may be necessary to set the frequency characteristic of the other band again.
[0005]
As described above, also in the frequency characteristic setting method by the DSP of the
conventional example, the graph of the frequency characteristic is displayed on the monitor
screen so that the frequency characteristics of all the low, middle and high regions become
desired. If one is read out, it is necessary to move the operator to adjust the frequency
characteristics, and to repeat the work by trial and error. Therefore, the setting operation is
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complicated, and it takes a relatively long time to complete the setting.
[0006]
The present invention has been made in view of such problems in the prior art, and its object is
to provide an audio system in which speakers are individually installed for a plurality of bands, in
which frequency of signals supplied to the speakers is provided. An object of the present
invention is to provide a frequency characteristic setting device for setting characteristics easily
and in a short time.
[0007]
According to a first aspect of the present invention, there is provided a frequency characteristic
setting device in an acoustic system comprising a plurality of speakers provided corresponding
to a plurality of bands according to the present invention. In the frequency characteristic setting
device in which the frequency characteristic can be adjusted by moving the operating element on
the monitor screen, (a) graphs of frequency characteristics of each of a plurality of bands on the
same monitor screen, and (B) means for calculating all the changes in the frequency
characteristics of the respective bands caused by the movement when the operator on the
monitor screen is moved; And (c) means for changing the graph of the corresponding frequency
characteristic on the monitor screen according to the change in the calculated frequency
characteristic.
The above-mentioned plurality of frequency bands are the high band, middle band and low band,
and the controls on the monitor screen are for gain adjustment and cut-off arranged on the
graphs of the frequency characteristics of these three frequency bands. It is preferable to include
an operator for frequency adjustment, and an operator for cross point adjustment which
represents a cross point between low and middle frequencies and a cross point between middle
and high frequencies.
[0008]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 shows a block diagram of an
acoustic system provided with a frequency characteristic setting device according to the present
invention. In the figure, reference numerals 11, 12 and 13 denote a microphone, a playing device
and a noise generator which constitute an acoustic input source, and acoustic signals from these
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acoustic input sources are processed by a digital signal processor (DSP) 30 via a preamplifier 2.
Supplied to The DSP 30 digitally processes the signal, and the input acoustic signal is divided and
adjusted by the DSP 30 into three frequency bands of high, middle and low frequencies, and the
power amplifiers 40 H, 40 M, It is supplied to the high frequency speaker (high frequency SP) 50
H, the mid frequency speaker (mid frequency SP) 50 M, and the low frequency speaker (low
frequency SP) 50 L via 40 L and reproduced from these speakers. Note that the high band, the
mid band, and the low band are respectively represented by subscripts H, M, and L. Reference
numeral 60 denotes a personal computer (PC) for controlling the DSP 30, and comprises monitor
means, memory means, and input means such as a keyboard and a mouse.
[0009]
The DSP 30 has the configuration shown in FIG. 2 and has three channels of high band, middle
band and low band. The high-pass channel has a high-pass filter (HPF) 31H, a gain adjuster
(GAIN) 32H, a phase adjuster (φ) 33H, an equalizer (EQ) 34H, and a delay means (DELAY) 35H.
And similar circuits in the low band channel. However, it is needless to say that in the middle
band and the low band channel, a band pass filter (BPF) 31M and a low pass filter (LPF) 31L are
used instead of the high band channel HPF 31H.
[0010]
The frequency characteristic setting method according to the present invention, which is
performed in an acoustic system having such a configuration, will be described with reference to
FIGS. 3 and 4. When the setting process of the frequency characteristic starts, the graph of the
currently set frequency characteristic in the three channels of high band, middle band and low
band is read out from the memory means of the PC 60 and, as shown in FIG. The same screen is
displayed on the monitor means. These frequency characteristics are, for example, the combined
frequency characteristics of the HPF 31 H and the gain adjuster 32 H in the high frequency
channel, and are frequency characteristics initialized to these or already set at this time, It is
stored in the memory means. The same applies to the middle and low frequency characteristics.
In the monitor screen of FIG. 4, Cg and Ccut are a gain adjustment operator and a cutoff
frequency adjustment operator, respectively, as described in connection with the conventional
example. It is a crosspoint frequency adjustment operator for adjusting the crosspoint frequency
at which the graphs of the frequency characteristics of the bands intersect.
[0011]
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Next, the operator looks at the monitor screen and appropriately adjusts the operators Cg, Ccut,
and Ccp on the graph vertically and horizontally. For example, as shown in FIG. 4A, when the
gain adjustment operator Cg (H) in the high frequency band is moved upward (dotted line to
solid line), the PC 60 responds accordingly to the gain adjuster 32H (FIG. Adjust the gain of) to
be high. As a result, since the cross point frequency changes, the PC 60 moves the cross point
frequency adjusting operator Ccp (MH) on the monitor screen to the upper left. Then, since the
position of the cutoff frequency adjustment operator Ccut (H) changes, it is moved upward.
Further, as shown in FIG. 4B, the cut-off frequency adjustment operator Ccut (H) is operated on
the monitor screen to change the slope of the cut-off frequency slope (dotted line to solid line);
Changes the characteristics of the HPF 31H (FIG. 2). As a result, since the cross point frequency
changes, the PC 60 moves the cross point frequency adjusting operator Ccp (MH) on the monitor
screen to the lower right. Furthermore, as shown in FIG. 4C, when the crosspoint frequency
adjustment operator Ccp (LM) is moved to the right, the PC 60 changes the characteristics of the
BPF 31M and the LPF 31L (FIG. 2) accordingly. . As a result, the cutoff frequency of the low
range and the mid range changes, so the PC 60 moves the cutoff frequency adjustment
manipulators Ccut (L) and Ccut (M1) on the monitor screen to the right. The operator monitors
the change of the characteristic curve and further moves the appropriate operator as needed to
adjust the overall frequency characteristic.
[0012]
As apparent from the above, adjusting one control affects the frequency represented by the other
control. In the conventional example, among such influences, the mutual effects of bands can not
be seen on the same monitor screen, so the graph of the frequency characteristic of each band is
switched and adjusted, and it is repeated. Since the desired characteristics were obtained as a
whole by performing, adjustment and setting of the frequency characteristics were difficult. On
the other hand, in the present invention, since the frequency characteristics of the three bands
can be monitored and adjusted on the same monitor screen, the entire characteristics can be
extremely easily set to a desired one. That is, in an acoustic system provided with a speaker
corresponding to each of a plurality of bands, it is important to obtain good characteristics as the
whole acoustic system, but according to the present invention, the entire frequency Since the
characteristics can be adjusted while viewing the same screen, the desired characteristics can be
set extremely easily. Also, it can be set in a very short time.
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