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JPS62193500

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DESCRIPTION JPS62193500
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
sound field creating apparatus capable of setting a sound field according to the preference of a
listener by a simple operation in a stereo music reproducing apparatus. [Prior Art]
Conventionally, in a car audio system, in order to make the sound field comfortable, (i) speakers
are provided such that a total of four speakers are provided, one on the left and one on the front
and one on the rear. Methods such as multisystemization of the system, and (11) mixing of
components that are electrically delayed to reproduced sound to give an apparent reverberation
effect are taken. In the method (i), the volume balance on the left and right 2 can be adjusted
with an attenuator, and the difference in the listening position can be corrected by adjusting this
volume balance, so it seems that the sound was covered at any listening position There is an
advantage in being able to make a comfortable sound field. However, with this method, it is not
possible to obtain a sense of sound spread or reverberation. According to the method (ii), it is
possible to obtain the reverberation and the sound spreading depending on the listening position.
However, in this method, even with a sound source that needs to form a sound image at the
center position, the electrical delay signal is mixed with it, and the localization of the sound
source is impaired with respect to vocal music and radio sound signals. I can not avoid giving a
feeling. As a common problem with the methods (i) and (1i), there is a misconception that sound
field correction must be performed by the listener manually operating a large number of variable
resistors. [Problems to be Solved by the Invention] The present invention overcomes the
problems of the prior art described above, does not significantly impair the localization of vocals
and radio sounds, and gives a sense of expansion, and is a narrow compartment space. Also, it is
intended to provide a sound field creation device that can be equivalent to a listening room or
even a concert hall. [Means for Solving the Problems] The sound field creation device according
to the present invention extracts the indirect sound component included in the reinput signal by
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extracting the difference signal of the left and right input signals, and the difference signal The
phase inversion signal and the left and right input signals are respectively mixed, and the mixing
ratio is made variable by the control circuit. [Operation] In this invention, indirect sound
components are extracted from the left and right input signals, and the indirect sound
components, the inverted signal of the components and the left and right input signals are mixed
at a mixing rate according to the listener's preference. Therefore, the indirect sound component
is enhanced, and the narrow sound field with high sound absorption effect is artificially brought
close to the sound field suitable for normal stereo reproduction.
An embodiment of the present invention will now be described with reference to the drawings.
FIG. 1 is an electrical circuit diagram showing a sound field creating apparatus according to an
embodiment of the present invention. In the figure, 1 is an indirect sound extraction circuit, 2 is a
phase inversion circuit, 3 is a signal mixing circuit including a front speaker drive amplifier, 4 is a
signal mixing circuit including a rear speaker drive amplifier, 5 is a mixing ratio setting circuit
(mixing ratio control 61.62 is a front speaker, and 63.64 is a rear speaker. The input signal of the
circuit of this embodiment, R is the left of the reproduction signal of the cassette player, compact
disc player, FM stereo receiver, etc. It is a right channel signal. The indirect sound extraction
circuit 1 is composed of a differential amplifier 1a and resistors 1b to 1d, as shown in FIG. 2 as
its specific circuit example, and in this circuit, outputs a difference signal of R signals. It is. The
phase inverting circuit 2 is composed of an operational amplifier 2a and resistors 2b and 2c as
shown in a specific circuit example in FIG. The signal mixing circuits 3 and 4 are composed of an
operational amplifier 41a and resistors 41b to 41d and a resistor switching circuit 42.43 as
shown in an example in FIG. In this example, attenuation amounts corresponding to two
resistances can be selected for the input AL by the control signal D0, and two attenuation
amounts can be selected similarly for the control signal for the input Bt. Therefore, in the
amplified output CL, a signal obtained by adding at four types of addition ratios is obtained by
the combination of the logical values of Do and D +. The mixing ratio setting circuit 5 is a switch
as shown in an example in FIG. It comprises NAND gate elements 52a and 52b, resistors 532 to
53c, and the like. In this example, the switch 51 has four contacts, which allow selection of four
types of states, and depending on the switch position, a 2-bit code signal from the 2-mixture AND
element 52, , D. Is output. This code signal corresponds to the control signal of the mixing circuit
3 or 4 described above. Next, the operation of the sound field creation device according to one
embodiment of the present invention will be described. A music reproduction signal of a CD
player or the like, R is input to the signal mixing circuits 3 and 4 and also input to the indirect
sound extraction circuit 1 at the same time. The indirect sound extraction circuit 1 extracts the
indirect sound component at the time of recording approximately by obtaining the difference
signal L-R of the two inputs with the circuit as shown in FIG. This is that during stereo recording,
sound waves coming directly from sound sources such as musical instruments are in phase with
each other in left and right channels, while reflected waves from walls, floors, etc., and indirect
sounds are in different phases in left and right channels. In consideration of being
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Therefore, by taking the difference between the left and right channel signals, the direct sound of
the in-phase component is removed while the 1 indirect indirect acid component is extracted
without being removed. Thus, the signal L-R containing a large amount of indirect sound
components extracted by the indirect sound extraction circuit 1 is input to the signal mixing
circuits 3 and 4 together with the signal R-L whose phase is inverted by the phase inversion
circuit 2. The signal mixing circuit 3 outputs a signal for driving the front speaker, and the signal
mixing circuit 4 similarly outputs a signal for driving the rear speaker. Both function as an
independent mixing circuit for both L channel and R channel, and the operation per channel can
be understood from the circuit configuration shown in FIG. 4, two different input signals A and B.
According to the switching mode of the analog switch, mixing is performed at four mixing ratios.
Here, the input AL is the output signal of the indirect sound extraction circuit 1. The input BL is a
direct reproduction signal. The output CL of this circuit is a signal obtained by mixing the input
AL + BL at a predetermined ratio, and this signal drives the front speaker 61 disposed on the left
side. On the other hand, for the cloth side channel signal system, the input A is the output signal
of the phase inversion circuit 2 and the input B is the direct reproduction signal R, and the right
front speaker 62 is driven by the output signal CR. The signal mixing circuit 4 for driving the rear
speaker performs the same operation as described above. However, the mixing ratio can be set
independently on the front side and the rear side. This ratio setting can be performed by the
control signal D generated by the control signal generation circuit as shown in FIG. Although only
one system of circuits is shown in FIG. 5, there is actually another system of control circuits,
which are configured to be capable of independently controlling the mixing ratio on the front
side and the rear side, respectively. Next, the effect of the sound field creation device according
to this embodiment will be described. As can be understood from the above description of the
operation, the feature of the function of this device is that the indirect sound component included
at the time of recording is extracted as the speaker drive signal, and a signal obtained by
appropriately mixing this with the source reproduction sound Where to use. Furthermore, it is
characterized in that the mixing ratio can be controlled on several levels independently on the
front side and the rear side. A room that is as narrow as a car cabin and has large sound
absorption characteristics is not a comfortable sound space. One of the causes is that the
reverberation effect is small. Therefore, extracting the indirect sound component included in the
music source as in the present embodiment and enlarging and reproducing it extracts the sound
field of the car room aurally closer to that of a general lighting room or a concert hall Bring
effects.
However, the degree of this effect must be different due to differences in training position and
personal preferences. In the present apparatus, therefore, the mixing ratio is provided in several
stages so that it can be selected according to the listening position and the preference of the
listener. Table 1 shows the relationship between the indirect sound mixing ratio on the front side
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and the rear side and the simulated sound field that is considered to correspond thereto. Table 1
In this embodiment, the switches of the ratio setting circuit shown in FIG. 5 make it possible to
set four types of sound fields as the sound fields created simply by simple operation, whereby the
utilization efficiency of the car audio system is obtained. It can be improved. The present
invention is particularly effective in appreciating music reproduction sound in a narrow space
such as a car cabin. Therefore, in the above embodiment, the present invention is applied to a car
audio system, that is, a case of creating a sound field in a passenger car cabin. As described
above, in the case of stereo music reproduction in a room having a narrow and large sound
absorption characteristic other than the car audio system, the same effect as that of the above
embodiment can be obtained. [Effects of the Invention] As described above, according to the
sound field creating device of the present invention, since a comfortable sound field according to
the user's preference can be created by a simple operation, its practical value is considered to be
large.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a block diagram of an electric circuit showing an apparatus for creating a sound field
according to an embodiment of the present invention, FIG. 2 is a diagram showing a concrete
circuit example of the indirect sound extraction circuit 1 of FIG. FIG. 3 shows a specific circuit
example of the phase inversion circuit 2 of the figure, FIG. 3 shows a specific circuit example of
the phase inversion circuit 2 of FIG. 1, and FIG. 4 shows a specific example of the signal mixing
circuit 3 of FIG. FIG. 5 is a view showing a typical circuit example, and FIG. 5 is a view showing a
specific circuit example of the mixing rate setting circuit 5 of FIG.
1 is an indirect sound extraction circuit, 2 is a phase inverting circuit, 3 ° 4 is a signal mixing
circuit, 5 is a mixing ratio setting circuit (mixing ratio control circuit), and 61 to 64 are speakers.
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