JPS56116397

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DESCRIPTION JPS56116397
Description 1, title of the invention
Speaker device
The present invention relates to a speaker apparatus in which one speaker unit is disposed on
the front left and right sides of the listener in the listening room, and in particular, the angle of
each speaker constituting the speaker unit It is an object of the present invention to provide a
speaker device which can be varied internally and in which each of these speakers is provided
with a frequency characteristic correction circuit, an attenuation circuit and a delay circuit. The
sound emitted from the speaker to the listener is emitted directly from the speaker and directly
to the listener, and reflected from the peripheral wall, floor, ceiling, etc. once or several times to
the listener, and The reflected sound energy increases as the directivity of the speaker is wider.
The reflected sound differs depending on the time delay with respect to the direct sound, the
number of wall reflections, the decrease in the reaching sound pressure level, the incident angle
of the sound to the listener, and the like. The first, second, etc. reflections that arrive at the initial
stage as reflections greatly affect the sound quality of the direct sound, and the other high-order
reflections affect the sound etc. In consideration of the above points, conventionally, one speaker
unit is arranged in front of the listener in the listening room, respectively, and the speaker unit
emits sound toward the wall of the listening room to utilize the reflection of the wall. EndPage:
There is considered a speaker device which provides a feeling of resonance and a feeling of
expansion. However, the conventional speaker apparatus of this type only reflects high-frequency
components, or merely controls the energy ratio between direct and indirect sound, and the
direction of voice over the entire frequency band Is not considered. In addition, when the
listening room is small, the delay time of the reflected sound is short, so it sounds ample. There
was a drawback that I could not get a sense of expansion. The present invention eliminates the
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above-mentioned conventional drawbacks, and according to the listening condition and the
reproduction sound field, the incident angle to the listener of the primary and secondary
reflected sounds which gives a lot of sound quality effects radiated in the wall direction etc. , By
adjusting the direction of the speaker, as well as a delay circuit that produces a long delay time
that can not be obtained only by the reflected sound from the wall, an attenuation circuit that
attenuates the direct sound, and a high at the listening point A speaker device capable of
obtaining a sound field effect such as a feeling of echo and a sense of expansion by providing a
speaker with a frequency characteristic correction circuit that corrects deterioration of a range
component. Hereinafter, examples of the present invention will be described in detail along with
experimental results. As shown in FIG. 1, the stereo listening state of the membrane listener 1 is
mostly 6 tatami to 8 tatami room, and the distance 氾 between the left speaker unit 2 and the
right speaker unit 2 ′ is 1.6 m. As for the speaker listening distance, 1 m to 2 m is generally
about -2.5 m.
Focusing on the left speaker unit 2, there are six paths in the incident direction of the reflected
sound to the listener. These are the right wall, the left wall, the front wall, and the rear wall in the
horizontal direction as shown in FIG. In the vertical direction it is the floor and the ceiling. Among
them, it is experimentally confirmed that the reflection from the right wall, the left wall, and the
front wall has a particularly large influence on the sound quality. FIG. 2 shows the results of this
experiment. In the stereo listening state shown in FIG. 1, direct sound, primary and secondary
reflections which are emitted from the left speaker unit 2 and reach the listener 1 and affect the
sound quality are shown. It shows the radiation angle (horizontal direction) of the sound. In
addition, as shown in FIG. 1, the custom order shown in FIG. 2 is as follows: g = 1. sm. It shows
the radiation angles of the direct sound and the primary and secondary reflected sounds in the
case of 2.0 m, 2.5 m, L = 1, Orri ′ ′, 1.6 m and 2.0 m. As apparent from FIG. 2, the radiation
angles of the direct wave and the first and second reflected waves emitted from the left speaker
unit and reaching the listener 1 are 45 ° ± 40 °, 165 ° ± 15 °, It has been found that the
direction of 2900 ± 20 ° and the control of the radiation energy in the three horizontal
directions provide the best sound reproduction. The present invention is based on the above
result, and FIG. 3 shows the connection state of the left speaker unit, and FIG. FIG. 6 shows the
top and side of the left speaker unit, respectively. The circuit configuration of the present
embodiment will be described based on FIG. 3. 4, 3 is a main speaker for direct sound, and the
main speaker 3 is directed in the main axis direction (0 ° direction), 4 is a speaker for right-wall
reflection directed at 45 ° horizontal to the main axis direction, 5 is a speaker for front-wall
reflection directed at 166 ° horizontal, 6 is a left directed at 290 ° horizontal Speakers for wall
reflection, and '7, 8.9 are frequency characteristic correction circuits of these speakers 4.5 and 6,
respectively, and correction with high frequency components is mainly performed. Reference
numerals 10 and 11.12 denote delay circuits, and the setting of the delay time of the delay
circuits 10 and 11.12 can control the feeling of echo and the feeling of expansion of the voice,
but further control the overall sound quality by constructing a reverberation pattern It is
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possible. The delay time of the delay circuit 10, 11.12 is variable in the range of 0 to 200 m5.
13,14.15 are attenuators for level control of the speakers 4, 5 and 6, respectively, and by
operating the attenuators 13, 14 and 15 for level control, the sense of force and the expansion of
the voice are obtained. You can control the feeling, sound and so on, which greatly affects the
sound quality and sound field effect exhibition.
Also, 16 ° 17.18 is an amplifier for driving the speakers 4 and 5.6. Next, the structure of the
speaker device of this embodiment will be described based on FIG. 4 and FIG. 6. The left speaker
unit 19 comprises the main speaker 3 for direct sound directed to the main shaft 20 and the
main speaker 20 EndPage: Speaker 4 for right-wall reflection directed to two directions, Speaker
5 for front-wall reflection directed to about 166 ° horizontal direction, and directed to about
290 ° horizontal direction Speakers 6 for left wall reflection are formed, and these speakers 3 to
6 are rotatable around rotary bearings 3a, 4a, 5a, 6a provided on the back surface, respectively,
and the size of the listening room The angle of the sound radiated to each reflecting wall can be
freely adjusted by the shape, the state of reflecting the wall, etc., and the sound quality can be
made the optimum sound field. The right speaker unit is symmetrical to the left speaker unit. As
described above, according to the speaker device of the present invention, the conventional
stereo reproduction effect can be obtained, and the control of the reflection direction of the
speaker for reflected sound, the delay circuit provided in the speaker for reflected sound, and the
level By controlling the control attenuator and the frequency characteristic correction circuit,
even in a small room, it is possible to obtain more spatial sound field feeling in a small room, and
the practical value is a dog.
4. Brief description of the drawings. FIG. 1 is a top view showing a state of listening to a speaker,
FIG. 2 is a diagram showing a speaker radiation energy distribution in a horizontal plane
necessary to obtain a good external sound field, FIG. FIG. 5 is a block diagram of the left speaker
unit of the speaker apparatus according to an embodiment of the present invention, FIG. 4 is a
top view of the left speaker unit, and FIG. 5 is a side view thereof. 3 ······ Main speaker for direct
sound, 4, 5.6 ······ Speaker for reflected sound, 7, 8.9 ······· Frequency characteristic correction
circuit, 10, 11 ..12 delay circuit, 13, 14, 15. Name of agent Attorney Nakao et al. 1 person
EndPage: 3 Fig. 3 Fig. 4 Fig. 5 EndPage: 4
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