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DESCRIPTION JPH0285637

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DESCRIPTION JPH0285637
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
electronic silencer that generates an additional sound in the opposite phase to an air conditioning
ringing noise in an air conditioning duct leading to a living room and performs muffling by sound
wave interference. The present invention relates to an electronic silencer that can freely control
the muffling effect. In addition, the term "room" is used to mean a building space where people
can enter, such as factory space or a platform for te. 2. Description of the Related Art
Conventionally, as shown in FIG. 2, to prevent noise in the air conditioning duct, an air
conditioning duct for connecting the space of the living room 7 and the air conditioner to
perform air conditioning of the living room 7 A sound absorbing type sound absorber such as a
sound absorbing duct 12 and a sound deadening elbow, and an expansion type sound silencer
utilizing reflection of sound waves are installed. However, since it is difficult to take measures
against low frequency noise and the muffling effect can not be changed, it has been impossible to
control the sound environment in the living room 7 determined by the rattling 6 from the air
conditioning duct. As the comfort of the sound environment largely depends on the psychology,
the noise level of the living room 7 is not necessarily as low as possible, and a level suitable for
the usage condition should be set. For example, although the quiet room 7 can be used as it is for
a meeting etc., when it is used as an office or the like, it is not suitable because it is too quiet. This
is because, since the room 7 is quiet, external noise such as room noise can be clearly heard by
the person in the room, and the work efficiency is reduced due to a psychological effect.
Therefore, when the quiet room 7 is to be used for multiple purposes, a speaker 11 for BGM
(pack grand music) is newly installed in the room 7, and secondary sounds such as music and
noise are generated according to the state of use. It has been carried out measures such as
psychologically masking speech and other scratching sounds and creating a sound environment
in accordance with the conditions of use in the living room, and the equipment and labor of the
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storage have been serious. In recent years, electronic silencers have been put to practical use that
generate additional noise in the opposite phase of scratching and perform muffling by sound
wave interference, and have demonstrated excellent effects for the five-sound countermeasure of
air conditioning ducts. There was no idea to freely set the sound environment in the room for the
purpose of maximizing the noise reduction effect. SUMMARY OF THE INVENTION The object of
the present invention is to solve the drawbacks of the prior art and to provide an electronic
silencer which can freely change the level of air conditioning noise. [Means for Solving the
Problem] A function for freely controlling the sound volume of the additional sound for sound
wave interference of the electronic silencer is added to the controller, and as a result, the
muffling effect of the electronic silencer is changed The present invention is characterized in that
the scratching level is controlled without arranging a new speaker or audio device.
[Embodiment] FIG. 1 shows an embodiment of the present invention. An air conditioning duct is
connected between the space of the room 7 and the air conditioner, and an electronic silencer 1
is installed in the air conditioning duct for the purpose of preventing the duct scratching noise 6.
The electronic muffler 1 is composed of a se / f-fif 2, a controller 3 and a speaker 4 for sound
wave interference. Based on the information from the sensor microphone 2, the controller 3
generates an additional sound in reverse phase from the noise 6 propagating through the duct
from the sound wave interference speaker 4 to perform muffling. Noise 6, which is muffled and
propagates in the duct whose level is reduced, passes through the air outlet 5 and the like
installed in the living room 7 and propagates into the living room. At this time, the controller is
provided with a function to freely change the volume of the additional sound generation in the
opposite phase to the noise, thereby adjusting the muffling performance of the electronic silencer
1, and the generation accuracy of the additional sound from the outlet 5 is high. The air
conditioning noise 8 and the sky in the low case, the noise control noise 9 are freely selected.
The controller 3 is connected to the remote control switch 10 installed in the living room 7 and
adjusts the muffling performance of the electronic silencer 1 by remote control. The specific
method of changing the generation accuracy of the additional sound is two methods of adjusting
the amplification level of the power amplifier built in the controller 3 or shifting the phase
characteristic of the additional sound generated from the sound wave interference speaker 4 and
simultaneously It is conceivable to do it. As a result, the noise level in the living room 7 can be
controlled without newly adding a speaker, an audio device, etc. in the living room 7, and the
indoor sound environment can be made desired. In this case, regardless of the level, the noise 6
transmitted into the room 7 is a kind of noise 6 similar to white noise without excellent
frequency characteristics, unlike the case of BGM (background music). There is no need to
consider subtle problems such as selection, and setting of the sound environment becomes easy.
In the embodiment of the present invention, the method of changing the level of the noise 6
propagating into the living room 7 by changing the volume of the additional sound generated by
remotely operating the controller 3 with respect to one electronic muffling device 51 will be
described. However, in a system as shown in FIG. 3 in which a plurality of electronic silencers 1
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are installed in series, the operation of the electronic silencer 1 is controlled by the main
controller 13 of the entire system to control the muffling effect. Alternatively, the level of noise
propagating into the room 7 may be changed. Moreover, in addition to the addition sound of
anti-scratch and antiphase, it generates an additional sound that is unrelated to noise and
corresponds to GM, and propagates from the blowout port into the living room, further flexibility
during selection of sound environment. It can be
[Effects of the Invention] It is possible to freely control the muffling effect of the Yukiko muffs
and obtain a desired sound environment.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a block diagram
showing a conventional silencer, and FIG. 3 is a block diagram showing a modification of the
present invention.
l ... electronic silencer, 2 ... sensor microphone. 3 ... controller, 4 ... speaker for sound wave
interference. 5 ・ ・ ・ Air outlet, 6 ・ ・ ・ Noise. 7 ... room, 10 ... remote control switch. Patent
applicant Hitachi Plant Construction Co., Ltd. Fig. 1-1 · · + iA sound answer 2 · · · サ マ イ ク O Oh
□ 3 □-、, draw 74-· 截 参 参 ス-5−-5 Exit 6-· pigeon 7---store t 1 ()-這 7 ス イ Figure 2 Figure 3
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