JP2023122019A - Acoustic device with ventilation function and elevator system - Google Patents

Abstract

To form an acoustic environment capable of improving sound quality in a ventilated space while ventilating the ventilated space.SOLUTION: An acoustic device with a ventilation function comprises an acoustic duct provided in a ventilated space of a ventilation target and having an inlet port and an exhaust port, a fan provided in the acoustic duct and exhausting air sucked from the inlet port to the ventilated space through the exhaust port by performing rotational drive, and two or more speaker cabinets provided on the acoustic duct and radiating acoustic waves toward the inside of the acoustic duct. Each of the speaker cabinets has a speaker unit having a radiation plane for radiating acoustic waves, the radiation plane being arranged toward the inside of the acoustic duct. The acoustic wave radiated from the radiation plane is radiated toward the ventilated space from the exhaust port of the acoustic duct. The wall surface of the acoustic duct forms a channel for ventilation air flowing from the inlet port to the exhaust port and functions as a diaphragm.SELECTED DRAWING: Figure 5

Description

TECHNICAL FIELD The present disclosure relates to an acoustic device with a ventilation function and an elevator system including the same.

For example, the elevator broadcasting device described in Patent Document 1 includes speakers with two different characteristics, omnidirectional and directional, and when outputting broadcast information to a user, the content of the broadcast information is Based on this, the speakers are switched to output broadcast information. These speakers are installed in the elevator hall.

In the case of an omnidirectional speaker, sound emitted from the speaker is radiated over a wide range to some extent. Therefore, for example, the guidance for informing emergency control operation such as fire is radiated from the omnidirectional speaker.

On the other hand, in the case of a directional speaker, sound radiation from the speaker becomes beam-like sound radiation. Therefore, for example, a directional speaker is used when outputting broadcast information directed only to users near the center of the hall. Specific examples of such broadcast information include an arrival chime indicating that a basket has arrived, an announcement such as "the door is closing", and the like.

However, the use of two types of speakers with different characteristics installed in the elevator hall inevitably results in the use of one type each, so that only monaural reproduction is possible. For this reason, it is not possible to reproduce sound sources such as audio content that is originally intended for stereo reproduction, and it is not possible to provide users with radiated sound that has a sufficient sense of spaciousness.

Therefore, even if two speakers of one type with the same characteristic are installed and used for stereo reproduction, in that case, the sound image is localized only at the peak position between the speakers. In this case, although the feeling of sound quality is improved as compared with monaural reproduction, the sound field in the space is not expanded because the sound field is created on the central axis between the speakers.

Furthermore, since the directional speaker is limited to providing information to a narrow range, there is a problem that the user cannot hear the target information sound if the user deviates from the central axis of the directional speaker.

Moreover, in Patent Document 1, the speaker is not intended to be installed in the car of the elevator, but is installed in the hall of the elevator. Therefore, in Patent Document 1, each speaker is installed at a location where the user can see it.

However, assuming that the speaker of the broadcasting device described in Patent Document 1 is installed in an elevator car, the installation position of the speaker is limited in a special environment such as an elevator car. . That is, in most cases, the speaker is installed either on the ceiling of the car or on the operating panel of the car. In addition, depending on the model of the elevator, there may be a case structure that takes into consideration the design. Therefore, it cannot always be guaranteed that the speaker will be installed where the user can see it in the car. Therefore, if the speaker is installed in a place where the sound radiating surface of the speaker is hidden, problems such as the radiated sound being blocked by walls, etc. will occur, and the radiated sound will not reach the user satisfactorily. The problem arises that it is not possible.

Therefore, when the speaker of the broadcasting apparatus described in Patent Document 1 is simply installed in the basket, it is impossible to present the acoustic reproduction sound and the information sound satisfying to the user only by the spontaneous sound radiation from the speaker. Can not.

Moreover, in Patent Document 1, it is not intended to install a ventilator on the ceiling of the cage. In order to keep the environment inside the cage clean, it is desirable to ventilate the inside of the cage. However, when the ventilation device is installed on the ceiling of the car, there is a problem that the installation position of the speaker is further limited.

JP 2005-162436 A

As described above, when the speaker of the elevator broadcasting device described in Patent Document 1 is simply installed in the car, there is a problem that it is not possible to present acoustic reproduction sound and information sound that satisfy the user. .

Further, in the elevator broadcasting device described in Patent Document 1, when a ventilation device is installed to ventilate the inside of the car, there is a problem that the installation position of the speaker is further limited.

An object of the present disclosure is to obtain an acoustic device with a ventilation function and an elevator system that form a sound field environment for improving sound quality in the space to be ventilated while ventilating the space to be ventilated.

An acoustic device with a ventilation function according to the present disclosure is provided for a space to be ventilated to be ventilated, and has an acoustic duct having an intake port and an exhaust port. A fan that discharges the air taken in from an intake port to the space to be ventilated from the exhaust port, and two or more speaker cabinets that are provided for the acoustic duct and radiate sound waves toward the interior of the acoustic duct. each of the speaker cabinets has a speaker unit having a radiating surface for radiating the sound waves, the radiating surface being disposed toward the interior of the acoustic duct, and the sound radiating from the radiating surface The sound wave is radiated from the exhaust port of the acoustic duct toward the space to be ventilated, and the wall surface of the acoustic duct forms an air path for the air for ventilation flowing from the intake port toward the exhaust port. At the same time, it functions as a diaphragm of the speaker unit.

An elevator system according to the present disclosure includes a car having the space to be ventilated therein, and the acoustic device with a ventilation function.

According to the acoustic device with a ventilation function and the elevator system according to the present disclosure, even in elevators in which new speakers cannot be installed, ventilation of the space to be ventilated is achieved by adopting an acoustic duct system that uses existing ventilation ducts. While doing so, it is possible to form a sound field environment capable of improving the sound quality in the space to be ventilated.

1 is a perspective view showing the configuration of an elevator system 1 according to Embodiment 1; FIG. FIG. 3 is a diagram showing the state of the internal space of the car 5 of the elevator system 1 according to Embodiment 1; 1 is a configuration diagram showing the configuration of an acoustic device 30 with a ventilation function according to Embodiment 1. FIG. FIG. 2 is a plan view showing the configuration of the ceiling portion 5c of the elevator system 1 according to Embodiment 1; 3 is a front view showing an example of the arrangement of an intake port 35 and an exhaust port 36 in the acoustic device 30 with ventilation function according to Embodiment 1. FIG. FIG. 6 is a plan view showing an example of arrangement of an intake port 35 and an exhaust port 36 in the case of FIG. 5; FIG. 10 is a front view showing the arrangement of an intake port 35 and an exhaust port 36 in the acoustic device 30 with a ventilation function according to a modified example of Embodiment 1; FIG. 8 is a plan view showing the arrangement of an intake port 35 and an exhaust port 36 in the case of FIG. 7; 3A and 3B are a side view and a front view showing an example configuration of a speaker cabinet 321 according to Embodiment 1; FIG. 8A and 8B are a side view and a front view showing another example of the configuration of the speaker cabinet 321 according to Embodiment 1; FIG. FIG. 4 is a plan view for explaining a general crosstalk phenomenon; 3 is a front view showing a model of the relationship between speaker unit 322 and microphone 50 in acoustic device 30 with ventilation function according to Embodiment 1. FIG. 4 is a diagram showing waveforms of direct sound and cross sound in the acoustic device 30 with ventilation function according to Embodiment 1. FIG. 3 is a diagram showing waveforms of sound waves output from a first phase control section 342b provided in the acoustic device 30 with a ventilation function according to Embodiment 1. FIG. 3 is a front view showing a model of the relationship between speaker unit 322 and microphone 50 in acoustic device 30 with ventilation function according to Embodiment 1. FIG. 3 is a front view showing a model of the relationship between speaker unit 322 and microphone 50 in acoustic device 30 with ventilation function according to Embodiment 1. FIG. 4 is a diagram showing waveforms of direct sound and cross sound of user B in acoustic device 30 with ventilation function according to Embodiment 1. FIG. FIG. 4 is a diagram showing waveforms of sound waves output from a second phase control section 342c provided in the acoustic device 30 with a ventilation function according to Embodiment 1; 4 is a diagram showing waveforms of sound waves output from a first phase control section 342b and a second phase control section 342c provided in the acoustic device 30 with ventilation function according to Embodiment 1. FIG. 3 is a diagram showing a state where user C is on the left side of user A in acoustic device 30 with a ventilation function according to Embodiment 1. FIG. 3 is a diagram showing a state in which user D is in front of user A in acoustic device 30 with a ventilation function according to Embodiment 1. FIG. FIG. 4 is a diagram showing an example of a first control table 60 used in the sound control section 342 of the sound device 30 with ventilation function according to Embodiment 1; FIG. 10 is a diagram showing an example of a second control table 61 used in the sound control section 342 of the sound device 30 with ventilation function according to Embodiment 1; FIG. 10 is a diagram showing an example of a third control table 62 used in the sound control section 342 of the sound device 30 with ventilation function according to Embodiment 1; 3 is a diagram showing frequency characteristics of acoustic content radiated from a speaker unit 322 in the acoustic device 30 with ventilation function according to Embodiment 1. FIG. 3 is a functional configuration diagram showing configurations of an acoustic control unit 342 and an output unit 344 provided in the control unit 34 of the acoustic device 30 with ventilation function according to Embodiment 1. FIG. FIG. 10 is a front view showing Modification I of the mounting method of the speaker cabinet 321 in the acoustic device 30 with ventilation function according to Embodiment 1; FIG. 28 is a plan view of Modification I of FIG. 27; FIG. 10 is a front view showing Modification II of the mounting method of the speaker cabinet 321 in the acoustic device 30 with ventilation function according to Embodiment 1; FIG. 30 is a plan view in the case of modification II of FIG. 29; FIG. 10 is a front view showing Modification III of the mounting method of speaker cabinet 321 in acoustic device 30 with ventilation function according to Embodiment 1; FIG. 32 is a plan view in the case of modification III of FIG. 31;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of an acoustic device with ventilation function and an elevator system according to the present disclosure will be described with reference to the drawings. The present disclosure is not limited to the following embodiments, and various modifications can be made without departing from the gist of the present disclosure. In addition, the present disclosure includes all combinations of configurations that can be combined among configurations shown in the following embodiments and modifications thereof. Also, in each figure, the same reference numerals denote the same or corresponding parts, which are common throughout the specification. In each drawing, the relative dimensional relationship, shape, etc. of each component may differ from the actual one.

Embodiment 1.
The configuration of the acoustic device with ventilation function and the elevator system according to the first embodiment will be described with reference to FIGS. 1 to 4. FIG. FIG. 1 is a perspective view showing the configuration of an elevator system 1 according to Embodiment 1. FIG. FIG. 2 is a diagram showing the internal space of the car 5 of the elevator system 1 according to Embodiment 1. As shown in FIG. FIG. 3 is a configuration diagram showing the configuration of the acoustic device 30 with a ventilation function according to Embodiment 1. As shown in FIG. 4 is a plan view showing the configuration of the ceiling portion 5c of the elevator system 1 according to Embodiment 1. FIG. FIG. 4 shows the ceiling portion 5c viewed from the side of the floor plate 5b.

As shown in FIG. 1, an elevator system 1 is installed in a building. The elevator system 1 comprises a car 5 , a hoistway 2 , a hoisting machine 3 , a main rope 4 , a counterweight 6 , an elevator control panel 7 and control cables 8 .

The car 5 ascends or descends within the hoistway 2 . A hoisting machine 3 is provided above the hoistway 2 . A main rope 4 is stretched over a sheave 3 a provided on the hoisting machine 3 . A basket 5 and a counterweight 6 are connected to both ends of the main rope 4, respectively. The cage 5 and the counterweight 6 are suspended from the sheave 3a by the main rope 4 in a hanging manner. An elevator control panel 7 is installed in the upper part of the hoistway 2 . The elevator control panel 7 is connected to the hoisting machine 3 via a communication line and to the car 5 via a control cable 8 . A control cable 8 transmits power and control signals to the cage 5 . Control cable 8 is also called a tail cord.

The basket 5 is composed of four side plates 5a, a floor plate 5b, and a ceiling portion 5c. The internal space of the basket 5 is a space to be ventilated by the acoustic device 30 with a ventilation function according to the first embodiment. The four side plates 5a of the basket 5 are arranged on the right side, the left side, the front side, and the rear side of the basket 5, respectively. A basket door 5d is installed on the front side plate 5a of the four side plates 5a. When the car 5 stops at the landing of each floor, the car door 5d engages with a landing door (not shown) installed at the landing to perform an opening/closing operation.

An acoustic device 30 with a ventilation function is installed on the upper surface of the ceiling portion 5c of the basket 5, as shown in FIG. As shown in FIG. 3, the acoustic device 30 with ventilation function includes a ventilation function section 31, an acoustic function section 32, an acoustic duct 33, and a control section 34 (see FIGS. 1 and 2). .

The ventilation function unit 31 has a fan 31a. A fan 31 a is provided for the acoustic duct 33 . Further, as shown in FIG. 2, the ceiling portion 5c of the basket 5 is provided with an intake port 35 and an exhaust port 36. As shown in FIG. The fan 31 a is rotationally driven to discharge the air sucked from the intake port 35 into the basket 5 from the exhaust port 36 . For example, as shown in FIG. 3, the fan 31a is accommodated inside an installation skeleton 31b for installation of the fan. The interior space of the basket 5 is a space to be ventilated.

The acoustic function section 32 has two or more speaker cabinets 321 . The speaker cabinet 321 is provided for the acoustic duct 33 and radiates sound waves that are reproduced based on the acoustic content 40 (FIG. 26) toward the interior of the acoustic duct 33 . The acoustic content 40 may be music, or natural sounds such as the babbling of a river or the chirping of birds. Examples of music include pop music that does not include vocals, pop music that includes vocals, classical music such as symphonies, healing music that has a healing effect, nursery rhymes, and movie music, but are not particularly limited. . The acoustic content 40 is stored in advance in the storage unit 343, for example.

The control unit 34 has a ventilation control unit 341 that controls the operation of the ventilation function unit 31 and an acoustic control unit 342 that controls the operation of the acoustic function unit 32, as shown in FIG. The ventilation control unit 341 may control to drive the fan 31a of the ventilation function unit 31 24 hours a day, but is not limited to this. The ventilation control unit 341 drives the fan 31a of the ventilation function unit 31 when the elevator system 1 is in the ON state, or drives the fan 31a of the ventilation function unit 31 when the car 5 is running. may Alternatively, the ventilation control unit 341 stops the fan 31a of the ventilation function unit 31 when a preset time has elapsed since the basket 5 stopped, and when the basket 5 starts to move again, ventilation is performed. It may be controlled to start driving the fan 31 a of the function unit 31 . The sound control unit 342 performs control to drive the sound function unit 32 while the car 5 is running. Alternatively, the sound control unit 342 stops the sound function unit 32 when a preset time has passed since the car 5 stopped, and stops the sound function unit 32 when the car 5 starts moving again. may be controlled to start driving. In either case, the fan 31a of the ventilation function section 31 is simultaneously driven while the acoustic function section 32 is being driven.

A cage control device 9 is installed on the upper surface of the ceiling portion 5c of the cage 5, as shown in FIG. The cage control device 9 controls the operation of each device provided in the cage 5 . Devices provided in the car 5 include a car door 5d, a ceiling light 5e, a car operating panel 5f, and the like.

In addition, although the example of FIG. 1 shows the case where the elevator system 1 is a rope type elevator, it is not limited to this case. The elevator system 1 may also be other types of elevators, for example linear elevators. Also, the elevator system 1 may be a machine room-less elevator.

As shown in FIG. 2, the interior space of the basket 5 is surrounded by four side plates 5a, a floor plate 5b, and a lower surface 5ca of the ceiling portion 5c. The internal space of the basket 5 has, for example, a rectangular parallelepiped shape. The floor plate 5b is formed of a rectangular plane installed in a horizontal direction. Each side plate 5a is composed of a rectangular plane installed in a vertical direction. Here, the vertical direction is, for example, the vertical direction. A lower surface 5ca of the ceiling portion 5c is arranged to face the floor plate 5b. A lower surface 5ca of the ceiling portion 5c is formed of a rectangular flat surface installed in a horizontal direction.

As shown in FIGS. 2 and 4, the ceiling portion 5c is provided with a ceiling light 5e. The ceiling lighting 5e is, for example, an LED lighting device. The irradiation surface of the ceiling light 5e faces the floor board 5b, as shown in FIG. The ceiling light 5e illuminates the interior space of the basket 5 with the light emitted from the irradiation surface 5ea.

As described above, the front side plate 5a of the four side plates 5a is provided with the basket door 5d. Further, as shown in FIG. 2, a car operating panel 5f is provided on the front side plate 5a. The car operating panel 5f is provided with a plurality of car call registration buttons provided corresponding to each floor, and a door open/close button for controlling the opening/closing operation of the car door 5d. Further, the car operating panel 5f is provided with an intercom device 5h for the user to communicate with the outside in an emergency.

As shown in FIG. 2, the car control device 9 is connected to the elevator control board 7 via, for example, a control cable 8 (see FIG. 1). As shown in FIG. 2, the car control device 9 has an input section 9a, a control section 9b, an output section 9c, and a storage section 9d. The input unit 9a inputs a control signal from the elevator control board 7 to the control unit 9b. The control unit 9b controls the operation of each device provided in the car 5 based on the control signal. The output unit 9c outputs a drive signal to each device under the control of the control unit 9b. Further, the output unit 9c transmits signals such as car call registration input by the user to the car operation panel 5f to the elevator control panel 7 under the control of the control unit 9b. The storage unit 9d stores the calculation results of the control unit 9b, various data and programs used in the control of the control unit 9b, and the like.

The control unit 34 has a ventilation control unit 341, a sound control unit 342, an output unit 344, and a storage unit 343, as shown in FIG. The ventilation control section 341 controls the operation of the fan 31 a provided in the ventilation function section 31 . The fan 31a has a motor 31aa and wing portions 31ab. The ventilation control section 341 controls driving of the motor 31aa to rotate the wing section 31ab by the motor 31aa. The air in the basket 5 is sucked through the intake port 35 by rotating the fan 31a. The air is filtered by the filter 37 and discharged into the basket 5 through the exhaust port 36 . The filter 37 collects particles contained in the taken air. Particles are, for example, suspended matter such as dust in the air, dust, PM2.5, pollen, and the like. The filter 37 may also have a deodorizing function of decomposing odor-causing substances such as acetaldehyde and a function of suppressing bacteria and viruses. In those cases, the filter 37 has, for example, a discharge electrode and a counter electrode inside, a DC voltage is applied to the discharge electrode and the counter electrode, and an electric field space and a discharge form a space. Odor-causing substances, bacteria and viruses in the air pass through the formed electric field space and discharge space, thereby deodorizing and suppressing bacteria and viruses.

The acoustic control unit 342 controls the operations of the amplifier 344b (see FIG. 26), the speaker cabinets 321L and 321R, etc. so as to form a high-quality sound field 52 in the interior space of the cage 5. FIG. The acoustic control unit 342 performs signal processing and phase control processing on the acoustic content 40 (see FIG. 26), and emits sound waves based on the acoustic content 40 from the speaker cabinet 231 into the cage 5 . Examples of signal processing include analog/digital conversion, digital/analog conversion, sound pressure level control, synthesis processing, and the like. Phase control includes propagation characteristic control, directivity control, and the like.

As shown in FIG. 3, the sound field 52 is desirably formed such that the height of the car 5 from the floor plate 5b includes a range of 1.6 m to 1.8 m. Thus, the sound field 52 is generated in a portion above 1.6 m inside the cage 5 . As a result, a sound field 52 is formed around and above the head of the user 80, as shown in FIG. The range of 1.6 m to 1.8 m in height from the floor plate 5b is set based on the average position of the user's 80 ears. In addition, in the range from 0 m to less than 1.6 m in height from the floor plate 5b, when a plurality of users 80 are in the car 5, the sound is blocked or absorbed by the bodies of the users 80. Therefore, a good sound field cannot be formed. In addition, when the sound field 52 is formed only in a range where the height from the floor plate 5b exceeds 1.8 m, the sound field 52 is formed biased further upward above the head of the user 80. It is difficult for the person 80 to hear audibly.

The output unit 344 transmits reproduction data of the driving signal and the acoustic signal to the speaker cabinets 321L and 321R under the control of the sound control unit 342. FIG. The output unit 344 has, for example, a D/A (digital/analog) converter 344a and an amplifier 344b, as shown in FIG. FIG. 26 will be described later.

The storage unit 343 stores the acoustic content 40 (see FIG. 26) to be radiated into the car 5. FIG. The storage unit 343 further stores the computation results of the sound control unit 432, various data and programs used in the control of the sound control unit 342, and the like. The acoustic control unit 342 reproduces the acoustic content 40 stored in the storage unit 343 and emits acoustic signals based on the acoustic content 40 to the interior space of the car 5 from the speaker cabinets 321L and 321R.

Here, the hardware configuration of the car control device 9 will be described. Each function of the input section 9a, the control section 9b, and the output section 9c in the car control device 9 is realized by a processing circuit. The processing circuitry consists of dedicated hardware or a processor. Dedicated hardware is, for example, ASIC (Application Specific Integrated Circuit) or FPGA (Field Programmable Gate Array). The processor executes programs stored in memory. The storage unit 9d is composed of a memory. Memory is non-volatile or volatile semiconductor memory such as RAM (Random Access Memory), ROM (Read Only Memory), flash memory, EPROM (Erasable Programmable ROM), or disk such as magnetic disk, flexible disk, or optical disk. be.

Also, the hardware configuration of the control unit 34 will be described. Each function of the ventilation control unit 341, the sound control unit 342, and the output unit 344 in the control unit 34 is realized by a processing circuit. The processing circuitry consists of dedicated hardware or a processor. Dedicated hardware and processors may be the same as above, so descriptions are omitted. The storage unit 343 is composed of a memory. Since the memory may be the same as the above, the description is omitted.

<Arrangement of intake port 35 and exhaust port 36>
Next, the arrangement of the intake port 35 and the exhaust port 36 will be described. FIG. 5 is a front view showing an example of the arrangement of the intake port 35 and the exhaust port 36 in the acoustic device 30 with ventilation function according to the first embodiment. FIG. 6 is a plan view showing an example of the arrangement of the intake port 35 and the exhaust port 36 in the case of FIG. FIG. 6 shows the acoustic duct 33 viewed from the Z1 side in the Z direction. As shown in FIGS. 5 and 6, the intake port 35 and the exhaust port 36 are provided in the ceiling portion 5c. Specifically, two through holes are formed in the ceiling portion 5 c , one of which serves as an air intake port 35 and the other serves as an air outlet 36 . The intake port 35 and the exhaust port 36 may be provided with a ventilation fan grill that functions as a cover. Both the intake port 35 and the exhaust port 36 are arranged on the back side Y2 in the Y direction inside the basket 5 . The intake port 35 and the exhaust port 36 are arranged side by side in the X direction. The intake port 35 and the exhaust port 36 form openings of the acoustic duct 33, respectively, as shown in FIG. An acoustic duct 33 connects between the intake port 35 and the exhaust port 36 . That is, the intake port 35 and the exhaust port 36 communicate with each other via the acoustic duct 33 . A fan 31 a is provided in the middle of the acoustic duct 33 . Therefore, the acoustic duct 33 is divided into an upstream space 33a and a downstream space 33b with the fan 31a as a boundary. A filter 37 is provided in the upstream space 33a. Air sucked from the intake port 35 flows through the upstream space 33 a and passes through the filter 37 . After that, the air flows through the downstream space 33b and is discharged from the exhaust port 36 into the basket 5 . Although the upstream space 33a is bent into an L shape in FIG. 5, it is not limited thereto. Both the upstream space 33a and the downstream space 33b may be formed in the shape of a straight tube with no bent portion, or may have a bent shape with one or more bent portions.

Next, a modification of the arrangement of the intake port 35 and the exhaust port 36 will be described. FIG. 7 is a front view showing the arrangement of the intake port 35 and the exhaust port 36 in the acoustic device 30 with ventilation function according to the modification of the first embodiment. FIG. 8 is a plan view showing the arrangement of the intake port 35 and the exhaust port 36 in the case of FIG. FIG. 8 shows the upstream space 33a viewed from the Z1 side in the Z direction. As shown in FIGS. 7 and 8, the intake port 35 and the exhaust port 36 are provided in the ceiling portion 5c. Specifically, two through holes are formed in the ceiling portion 5 c , one of which serves as an air intake port 35 and the other serves as an air outlet 36 . Both the intake port 35 and the exhaust port 36 are arranged in the center of the basket 5 in the X direction. The intake port 35 and the exhaust port 36 are spaced apart in the Y direction. The inlet 35 and the outlet 36 form the openings of the acoustic duct 33, as shown in FIG. Between the intake port 35 and the exhaust port 36, an upstream space 33a is provided as a fan duct. The intake port 35 and the exhaust port 36 communicate with each other via an upstream space 33a and a downstream space 33b. The upstream space 33a extends in the Y direction as shown in FIG. The longitudinal length of the upstream space 33a is substantially the same as the length of the basket 5 in the Y direction. The upstream space 33a extends across the basket 5 in the Y direction. A filter 37 is provided in the upstream space 33a. The downstream space 33b is a space between the fan 31a and the exhaust port 36, as shown in FIG. Air sucked from the intake port 35 flows through the upstream space 33 a and passes through the filter 37 . After that, the air flows through the downstream space 33b and is discharged from the exhaust port 36 into the basket 5 . Both the upstream space 33a and the downstream space 33b may be formed in the shape of straight pipes without bent portions. Alternatively, a bent portion may be provided between the upstream space 33a and the downstream space 33b. In that case, the upstream space 33a extends in the Y direction as shown in FIG. 8, and the downstream space 33b extends downward in the Z direction Z2 from the end of the upstream space 33a.

The length of the upstream space 33a of the modified example shown in FIGS. 7 and 8 is longer than the length of the upstream space 33a of the first embodiment shown in FIGS. Thus, the length of the upstream space 33a varies depending on the arrangement of the intake port 35 and the exhaust port 36, the dimensions and specifications of the basket 5, and the like.

<Speaker Cabinet 321>
Next, the configuration of speaker cabinet 321 will be described with reference to FIG. Since the speaker cabinets 321L and 321R described above have basically the same configuration, the speaker cabinets 321L and 321R will be collectively referred to as the "speaker cabinet 321". Similarly, the speaker units 322L and 321R will also be collectively described as "speaker unit 322".

9A and 9B are a side view and a front view showing an example configuration of the speaker cabinet 321 according to Embodiment 1. FIG. As shown in FIG. 9, the speaker cabinet 321 has a box-shaped housing 321 a and a speaker unit 322 . The speaker unit 322 is housed in a housing 321a. The speaker unit 322 is provided with a radiation surface 322a from which sound is radiated on the front surface 321b of the housing 321a. The sound waves radiated from the radiation surface 322 a propagate inside the acoustic duct 33 and are radiated from the exhaust port 36 into the cage 5 . The housing 321a has, for example, a rectangular parallelepiped shape. The housing 321a is a closed device. A radiation surface 322a of the speaker unit 322 is exposed to the outside through an installation hole provided in the housing 321a. All other parts constituting the main body of the speaker unit 322 are installed in the housing 321a. Therefore, the sound from the radiation surface 322a of the speaker unit 322 is radiated only in the direction of arrow E in FIG. do not have.

10 is (a) a side view and (b) a front view showing another example of the configuration of the speaker cabinet 321 according to Embodiment 1. FIG. As shown in FIG. 10, the speaker cabinet 321 has a box-shaped housing 321a. The speaker cabinet 321 may house two or more speaker units 322 in a housing 321a, as shown in FIG. In this case, for example, one speaker unit 322-1 may be a full-range speaker and the other speaker unit 322-2 may be a tweeter. A full-range speaker reproduces low to high frequencies with a single speaker. In each embodiment of the present disclosure, when one speaker unit 232 is accommodated in the housing 321a of the speaker cabinet 321, the speaker unit 232 is assumed to be a full-range speaker. Also, a tweeter is a low-range speaker that is used to assist a full-range speaker. It is difficult to reproduce low to high frequencies with one speaker, and it is assumed that the sound quality may be insufficient. In such cases, tweeters are used to compensate. The two or more speaker units 322 arranged in the housing 321a may be of different types, or may be of the same type. Thus, when one speaker cabinet 321 has a plurality of speaker units 322, the speaker cabinet 321 alone can improve the sound quality and expand the reproduction band.

As described above, in Embodiment 1, the speaker configuration of speaker cabinet 321 is as follows.

(1) One speaker cabinet 321 with one or more speaker units 322 mounted thereon is the "basic configuration" of a speaker system. Acoustic device 30 with a ventilation function according to Embodiment 1 has a basic specification of stereo reproduction using two or more of the above-described “basic configurations”.

(2) When the acoustic device 30 with ventilation function according to Embodiment 1 is installed in the existing elevator system 1 , the duct of the permanently installed ventilation device may be used as the acoustic duct 33 . In this case, the speaker cabinet 321 having the above-described "basic configuration" is attached to a ventilator having a fan 31a which is basically permanently installed in order to ventilate the internal space of the cage 5, which is a closed space. In the ventilator, the fan 31a and the interior space of the basket 5 are connected by a duct of arbitrary length depending on the installation position of the fan 31a to be used. The duct is used as a "front chamber space" for sound radiation in order to obtain an auditory wide sound field feeling in the wide space inside the cage 5, and here, the duct is called an "acoustic duct 33". call.

The acoustic duct 33 has a tubular shape. The acoustic duct 33 has, for example, a prismatic shape with a rectangular or polygonal cross-sectional shape, or a cylindrical shape with a circular cross-sectional shape. The acoustic duct 33 is made of a material such as resin or metal. A wall surface of the acoustic duct 33 forms an air path for ventilation air flowing from the intake port 35 toward the exhaust port 36 . Also, the wall surface of the acoustic duct 33 functions as a diaphragm for the speaker unit 322 . That is, like the cone of a megaphone, the walls of the acoustic duct 33 also serve as diaphragms for sound radiation.

(3) As acoustic radiation control, directivity control based on phase control is performed so that the radiated sounds of two speakers do not overlap in the "front room space" of sound radiation.

In general, a crosstalk phenomenon occurs between radiated sounds from two speakers, and the radiated sounds are superimposed to propagate the sound to the user located on the axis of the speaker. As a result, a stereo effect can be obtained only in the overlapped portion, resulting in narrow space radiation. In the first embodiment, in order to prevent this phenomenon, the radiation direction is controlled by controlling the acoustic characteristics (especially the phase time and the propagation time) of the sound emitted from the two speakers (hereinafter referred to as the first control). )I do. The crosstalk phenomenon and the first control will be described later.

(4) In the acoustic duct 33, acoustic signals radiated from the two speakers propagate respectively.

(5) Speaker radiation sound propagating in the acoustic duct 33 is acoustically radiated into the cage 5 from the exhaust port 36 of the acoustic duct 33 .

For example, as shown in FIG. 5, when comparing the cross-sectional areas when cut along a virtual plane that intersects the direction of air flow, the cross-sectional area S1 of the inner dimensions of the acoustic duct 33 is the same as the cross-sectional area of the inner dimensions of the cage 5. Smaller than S2. In a narrow space such as the acoustic duct 33, the acoustic radiation sound is compressed, but at the moment it is radiated from the exhaust port 36 of the acoustic duct 33 to a wide space such as the inside of the cage 5, the acoustic radiation sound is It radiates as a plane sound source. In addition, the influence of the standing wave in the duct is taken into account, and the sound pressure level is radiated all over the inside of the cage 5 as a sound pressure level higher than the sound pressure radiated immediately before the speaker. This is a phenomenon similar to that of a megaphone, etc., and an element of a horn speaker is also taken into consideration, and the inside of the cage 5 is provided with acoustic signals radiated from each speaker unit 233 .

In addition, depending on the design of the length of the acoustic duct 33, a resonance phenomenon occurs in which the standing wave frequency of the acoustic duct 33 and the frequency component contained in the sound source match. can also be made. In other words, by supplementing the low-frequency components of the sound, the low-frequency components that contribute to the feeling of spaciousness of the sound are enhanced, and the feeling of spaciousness/localization of the sound is obtained. In general, the longer the duct length of the acoustic duct 33, the stronger the low frequency components.

(6) Generally, one or more ventilators are installed at arbitrary positions on the ceiling surface of the basket 5 . One or more arbitrary fans are provided in the ventilator. The ventilation device circulates the air inside the basket 5 or the air outside the basket 5 by driving the fan 31 a to clean the air inside the basket 5 . In Embodiment 1, an example of circulating the air inside the basket 5 is described, but an additional duct may be provided to take in the air outside the basket 5 from the intake port 35 . In order to maintain a clean environment in the car 5, a ventilator has long been installed, and combined with the regular maintenance of the elevator, the regular maintenance of the ventilator is also performed. Therefore, by installing the acoustic device 30 with a ventilation function as a new acoustic device in the existing elevator system 1, it is possible to provide a sound field capable of simulating a wide space by acoustic radiation while performing ventilation.

In the example of FIG. 3, the height dimension H1 of the acoustic duct 33 is approximately 15 cm. The height dimension H2 of the speaker cabinet 321 is approximately 13 cm to 14 cm. The height dimension H2 of the speaker cabinet 321 is slightly smaller than the height dimension H1 of the acoustic duct 33 . Moreover, the width dimension W1 in the X direction of the installation frame 31b in which the fan 31a is accommodated is about 20 cm. The width dimension of the installation frame 31b in the Y direction is also about 20 cm. Further, the outer diameter of the fan 31a, that is, the width dimension W2 of the fan 31a in the X direction is about 14 cm. Thus, in Embodiment 1, the height dimension H2 of the speaker cabinet 321 is a size that allows it to be placed in a fairly limited space.

In the existing elevator system 1 installed in a building such as a building, it is practically impossible to install a new stereo reproduction device or the like. The reason is as follows. In order to install a new stereo reproduction device or the like, it is necessary to install a speaker unit for sound radiation on the ceiling surface of the car 5, and also to provide an opening for sound radiation. A ceiling light 5e, a ventilator, and the like are attached to the ceiling of the cage 5, and it is often not possible to install a new speaker unit due to space constraints. In addition, it is practically impossible to construct an opening for acoustic radiation in the ceiling of an existing elevator. On the other hand, in the acoustic device 30 with a ventilation function according to Embodiment 1, the duct of the existing ventilation device can be used as the acoustic duct 33, so there is no need to specially process the frame of the cage 5, and retrofitting is not required. Installation is possible.

In addition, in the new elevator system 1, a new design for speaker installation allows the speaker to be installed at an arbitrary position on the ceiling surface. Therefore, in the new elevator system 1, by installing the acoustic device 30 with a ventilation function instead of the ventilation device, it is possible to provide a sound field capable of simulating a wide space by acoustic radiation.

However, even in the case of the newly installed elevator system 1, because problems such as the thickness of the ceiling surface of the building frame and the space allocation with other built-in members are complicated, a unit with a large diameter is installed as a speaker unit. There are problems that cannot be done. Therefore, when the sound is directly radiated from the ceiling surface of the car 5, in most cases, the low frequency components of the radiated sound are small.

Generally, it is known that, as an effect of low frequencies, an effect of a feeling of spread of sound (a feeling of wide directivity) can be obtained in noise reduction in a general outdoor environment. In the acoustic device 30 with ventilation function according to Embodiment 1, the installation frame 31b in which the fan 31a is installed and the acoustic duct 33 as the ventilation air passage are used as a diaphragm (megaphone cone) for acoustic radiation. Secondary use is possible. Therefore, it is possible to generate a low frequency range of sound by a resonance phenomenon by using a low frequency component based on the duct length as a standing wave phenomenon of sound. Therefore, in the acoustic device 30 with a ventilation function according to Embodiment 1, the frequency of the acoustic radiation sound can provide a broadband frequency sound radiation from a relatively low frequency to a high frequency.

In particular, the wall surface of the car 5 of the elevator may be composed of a panel other than a metal panel, such as when the wall surface is decorated with a non-woven fabric or the like. When the wall surface of the basket 5 is covered with a non-woven fabric or the like, although the reflected sound of the sound radiation can be reduced, the reverberation of the sound may be lost due to the excessive sound absorption effect. On the other hand, in the acoustic device 30 with ventilation function according to Embodiment 1, since the acoustic signal of the low frequency component produced in the acoustic duct 33 is provided to the user from the ceiling surface, provides a direct low-frequency component to the Therefore, since a sound different from unintended reverberant sound caused by a reflected sound generated on a relative surface inside the car 5 can be provided above the head of the user 80, a pleasant reproduced sound can be felt above the head. .

<Crosstalk phenomenon>
Next, the crosstalk phenomenon will be explained. FIG. 11 is a plan view for explaining a general crosstalk phenomenon. In FIG. 11, a user 80 is a user having a typical adult height. A microphone 50R is installed in the right ear of the user 80, and a microphone 50L is installed in the left ear. In FIG. 11, the speaker unit 322 installed on the front right side of the user 80 is called a speaker unit 322R. Similarly, the speaker unit 322 installed on the front left side of the user 80 is called a speaker unit 322L.

At this time, the sound radiated from the speaker unit 322R becomes a direct sound R (reference numeral 43) and a cross sound RL (reference numeral 44) and reaches the microphones 50R and 50L, respectively. That is, the direct sound R (reference numeral 43) is a direct sound that propagates from the speaker unit 322R at an arbitrary time and arrives at the microphone 50R. A cross sound RL (reference numeral 44) is an indirect sound that propagates from the speaker unit 322R at an arbitrary time and reaches the microphone 50L.

Similarly, the sound radiated from speaker unit 322L becomes direct sound L (reference numeral 45) and cross sound LR (reference numeral 46), and reaches microphones 50L and 50R, respectively. That is, the direct sound L (reference numeral 45) is a direct sound that propagates from the speaker unit 322L at an arbitrary time and arrives at the microphone 50L. A cross sound LR (reference numeral 46) is an indirect sound that propagates from the speaker unit 322L at an arbitrary time and arrives at the microphone 50R.

Since the speed of sound is constant, the order of arrival at microphones 50L and 50R depends on the distance traveled by the sound. Therefore, the direct sound arrives first, followed by the cross sound. Thus, the propagation time of sound waves differs depending on the position of speaker cabinet 321 . Therefore, if the cross sound is radiated first, and then the direct sound is radiated later than the cross sound with a preset "time difference", the direct sound and the cross sound are emitted to the microphones 50L and 50R at the same time. will arrive. Acoustic device 30 with a ventilation function according to Embodiment 1 performs phase control using this principle. Hereinafter, the "time difference" may be referred to as "delay time". Microphones 50L and 50R are also sometimes referred to as "virtual microphones."

<Phase control>
In the acoustic device 30 with ventilation function according to Embodiment 1, the acoustic control section 342 performs first phase control and second phase control in order to improve the sound quality of the sound field 52 . The acoustic control section 342 has a first phase control section 342b that performs first phase control and a second phase control section 342c that performs second phase control, as shown in FIG. 26, which will be described later. The first phase control section 342b and the second phase control section 342c will be described later using FIG. The sound control unit 342 is provided for each speaker cabinet 321 or each speaker unit 322, as shown in FIG.

<First phase control>
The first phase control will be described with reference to FIGS. 12 to 14. FIG.

As described above, when the sound waves emitted from the radiation surface 322a of the speaker unit 322 reach a pair of virtual microphones, the direct sound reaching one virtual microphone and the cross sound reaching the other virtual microphone, There is a difference in propagation time between The first phase control section 342b performs first phase control for controlling the propagation characteristics of sound waves based on the difference in propagation time. Here, the pair of virtual microphones are microphones 50L and 50R.

Further, the first phase control unit 342b stores in advance the difference in propagation time between the direct sound and the cross sound in the storage unit 343 (see FIG. 2) as a first control pattern. Based on the first control pattern, the first phase control unit 342b delays the direct sound from the cross sound by a first delay time corresponding to the difference in propagation time, and radiates it from the radiation surface 322a of the speaker unit 322. Let

The first phase control will be described in detail below.

FIG. 12 is a front view showing a model of the relationship between the speaker unit 322 and the microphone 50 in the acoustic device 30 with ventilation function according to the first embodiment. In FIG. 12, reference numerals 43 to 46 are the same as those shown in FIG. 11, so description thereof will be omitted here.

FIG. 13 is a diagram showing waveforms of sound waves of direct sound and cross sound in acoustic device 30 with ventilation function according to Embodiment 1. In FIG. The data in FIG. 13 was measured by playing test sounds from the two speaker units 322L and 322R installed at the positions in FIG. 12 and receiving the test sounds with the microphones 50R and 50L. The measuring method will be described later with reference to FIGS. 12 and 15. FIG. FIG. 13 shows the waveforms of the direct sound R (reference numeral 43), the direct sound L (reference numeral 45), the cross sound RL (reference numeral 44), and the cross sound LR (reference numeral 46) received by the microphones 50R and 50L. there is In FIG. 13, the horizontal axis is time and the vertical axis is phase. As shown in FIG. 13, it can be seen that there is a time difference between the arrival times of these four sound waves.

Using this principle, the first phase control section 342b, which will be described later, performs the following processing to obtain the four waveforms shown in FIG. 14 from the four waveforms shown in FIG. FIG. 14 is a diagram showing waveforms of sound waves output from the first phase control section 342b provided in the acoustic device 30 with ventilation function according to the first embodiment. In FIG. 14, the horizontal axis is time and the vertical axis is phase.

A measurement method for obtaining the data of FIG. 13 will be described. First, two speaker units 322L and 322R are installed at the positions shown in FIG. Next, a model of the user 80 is arranged in the basket 5 . A microphone 50R is installed in the right ear of the model of the user 80, and a microphone 50L is installed in the left ear.

Next, a test sound is emitted from the two speaker units 322L and 322R installed at the positions shown in FIG. 12, and the test sound is received by the microphones 50R and 50L to perform binaural measurement. In binaural measurement, direct sound and cross sound are measured as differences in propagation time. The test sound used at this time is, for example, white noise signal-processed at the same sound pressure level in all frequency bands. At each measurement point, propagation time characteristics in white noise reproduction are recorded, FFT (Fast Fourier transform) analysis is performed on the measurement results at each measurement point, and phase characteristics are measured.

To simplify the explanation, the speaker unit 322 on the right side of the model of the user 80 is hereinafter referred to as a speaker unit 322R, and the speaker unit 322 on the left side is referred to as a speaker unit 322L, as shown in FIG. The order of reproducing the test sound from the speaker unit 322 is (1) only the speaker unit 322R, (2) only the speaker unit 322L, and (3) both the speaker units 322R and 322L. The order of (1) and (2) may be reversed, and (3) may be omitted. In this way, when the number of the speaker units 322 is two, the test sounds are reproduced one by one in order, and the sound inside the car 5 when each speaker unit 322 separately radiates the test sound is reproduced by the reproduction. Information on radiation characteristics can be obtained. Further, when (3) is performed as necessary, it is possible to further acquire information on the radiation characteristics inside the cage 5 when all the speaker units 322 simultaneously radiate the test sound.

When the test sound is reproduced in the cage 5 in this manner, four sound wave waveforms 43 to 46 in FIG. 13 are obtained. Also, based on the waveforms 43 to 46 of the four sound waves, the delay time of the cross sound RL (reference numeral 44) with respect to the direct sound R (reference numeral 43) is obtained. This delay time is called a first delay time. Similarly, the delay time of the cross sound LR (reference numeral 46) with respect to the direct sound L (reference numeral 45) is obtained based on the waveforms 43 to 46 of the four sound waves. This delay time is called a second delay time. The first delay time and the second delay time are stored in the storage unit 343 of the acoustic device 30 with ventilation function as the first control pattern.

Next, the first phase control section 342b obtains the absolute value of the negative phase component 47 of the direct sound R (reference numeral 43) shown in FIG. 13, and adds it to the positive phase component 48 of the direct sound R (reference numeral 43). do. Similarly, the first phase control section 342b obtains the absolute value of the negative phase component 47 of the direct sound L (reference numeral 45) and adds it to the positive phase component 48 of the direct sound L (reference numeral 45). The first phase control section 342b also performs the same processing for the cross sound RL (reference numeral 44) and the cross sound LR (reference numeral 46).

Further, the first phase control section 342b controls the amplitude and phase of the waveform of the direct sound R (reference numeral 43) and the waveform of the direct sound L (reference numeral 45) to align them with the same amplitude and the same phase. Further, the first phase control section 342b controls the amplitude and phase of the waveform of the cross sound RL (reference numeral 44) and the waveform of the cross sound LR (reference numeral 45) to align them with the same amplitude and the same phase. In FIG. 13, when the direct sound R (reference numeral 43) and the cross sound RL (reference numeral 44) received by the microphones 50R and 50L are compared, there is not only a difference in propagation time but also a clear sound pressure level. It can be seen that there is a difference. Similarly, in FIG. 13, comparing the direct sound L (reference numeral 45) and the cross sound LR (reference numeral 46) reveals not only a difference in propagation time but also a clear difference in sound pressure level. Therefore, the first phase control section 342b performs control to make the amplitude of the waveform of the direct sound R (reference numeral 43) and the waveform of the cross sound RL (reference numeral 44) equal to each other. Similarly, the first phase control section 342b performs control to equalize the amplitudes of the direct sound L (reference numeral 45) and the cross sound LR (reference numeral 46).

Then, the waveform of the direct sound R (reference numeral 43) is delayed from the waveform of the cross sound RL (reference numeral 44) by the first delay time. Similarly, the waveform of the direct sound L (reference numeral 45) is delayed from the waveform of the cross sound LR (reference numeral 46) by the second delay time. This gives the four waveforms of FIG. In FIG. 14, the cross sound RL (reference numeral 44) and the cross sound LR (reference numeral 46) are radiated first. After that, the direct sound R (reference numeral 43) and the direct sound L (reference numeral 45) are radiated after being delayed by the first delay time and the second delay time, respectively.

Due to the cross sound component, the sound images of the sounds radiated from the speaker units 322R and 322L are heard gathered at the center of the cross component, that is, at the center of the user's left and right ears. Here, in order to make the narrow space in the car 5 have an auditory illusion of a wide space by the radiated sound, it is necessary to make the user 80 hear as if the sound image is expanding. For this purpose, it is necessary to radiate the direct sound and the cross sound with a time lag. Therefore, the cross sound is emitted first, and then the direct sound is emitted with a time lag. It is necessary to match the phase characteristics of the cross sound and the direct sound so that the phase characteristics associated with the sound radiation are never reversed. Therefore, the first phase control section 342b performs phase adjustment. As a result, the cross sound radiated earlier can give the user 80 a feeling of sound movement, and the direct sound radiated after that can give the user a feeling of sound localization. As a result, the user can hear the sound radiation having a sense of movement and a sense of localization, which are obtained from the fact that the phases are aligned, without feeling that the sound field is hollow only above the user's head. It becomes possible.

Thus, the first phase control section 342b stores the first delay time and the second delay time in advance in the storage section 343 as the first control pattern. Based on the first control pattern, the first phase control section 342b controls the direct sound R (reference numeral 43) and the direct sound L (reference numeral 45) to be lower than the cross sound RL (reference numeral 44) and the cross sound LR (reference numeral 46). , delayed by a first delay time and a second delay time, and radiated. In addition, in the first phase control unit 342b, as the process of aligning to the same amplitude and the same phase and the process of delaying the emission time, for example, filter processing such as FIR (Finite Impulse Response) or IIR (Infinite Impulse Response) is used. . As a result, a sound field 52 with a feeling of high sound quality can be generated in the cage 5. - 特許庁

In the above description, in order to simplify the description, an example was described in which the microphones 50R and 50L were installed at one location when measuring the test sound. However, the positions of the microphones 50R and 50L may be changed to measure the test sound multiple times. In that case, the data in FIG. 13 can be obtained more accurately and accurately. FIG. 15 is a front view showing a model of the relationship between the speaker unit 322 and the microphone 50 in the acoustic device 30 with ventilation function according to the first embodiment. In FIG. 15, propagation time characteristics in white noise reproduction are recorded at at least three points of 10 cm, 50 cm, and 1 m in the 90-degree direction from the center of the exhaust port 36 of the acoustic duct 33 . Note that 90 degrees here indicates a direction directly below the center of the exhaust port 36 , and therefore these three points are set along the central axis F passing through the center of the exhaust port 36 . The virtual axis G in FIG. 15 will be described later in the description of the second phase control. Also, the microphone 50R and the microphone 50L are installed with a distance corresponding to the width of the head of the user 80 apart. However, FIG. 15 is merely an example, and the distances are not limited to 10 cm, 50 cm, and 1 m, and these distances may be changed as appropriate. By measuring at a plurality of measurement points in this manner, the propagation time characteristics can be analyzed with higher accuracy.

Only one type of first delay time and second delay time may be stored in the storage unit 343 as the first control pattern. The reason for this is that the first delay time and the second delay time are not always constant and change depending on the duct length L of the acoustic duct 33, the capacity of the cage 5, or the like. Therefore, the data in FIG. 13 may be measured for each elevator having a different duct length and for each elevator having a different car 5 capacity. A plurality of first control patterns may be prepared for each duct length and stored in the storage unit 343 (see FIG. 22). Similarly, a plurality of first control patterns may be prepared for each capacity of the basket 5 and stored in the storage section 343 (see FIG. 23). Furthermore, a plurality of first control patterns may be prepared for each duct length and each capacity of the basket 5 and stored in the storage unit 343 (see FIG. 24). 22 to 24 will be described later.

<Second phase control>
The second phase control will be described with reference to FIGS. 16 to 18. FIG. The second phase control is a phase control adapted to the case where a plurality of users 80 are present in the car 5 .

The second phase control section 342c performs second phase control for controlling the propagation characteristics of the sound wave emitted from the emission surface 322a of the speaker unit 322 based on the directivity angle of the sound wave.

As described above with reference to FIG. 11, when the sound waves emitted from the radiation surface 322a of the speaker unit 322 reach a pair of virtual microphones, the direct sound reaching one virtual microphone and the sound reaching the other virtual microphone There is a difference in propagation time between the cross sound and . The second phase control unit 342c controls the propagation characteristics of sound waves for each directivity angle of the sound waves emitted from the radiation surface 322a based on the difference in propagation time. Here, the pair of virtual microphones are microphones 50L and 50R.

In addition, the second phase control unit 342c pre-stores in the storage unit 343, as a second control pattern, the difference in propagation time between the direct sound and the cross sound for each directivity angle of the sound wave. The second phase control section 342c controls the order in which the direct sound and the cross sound are emitted based on the second control pattern.

16 is a front view showing a model of the relationship between the speaker unit 322 and the microphone 50 in the acoustic device 30 with ventilation function according to Embodiment 1. FIG. 16, reference numerals 43 to 46 are the same as those shown in FIG. Reference numerals 43 to 46 are measurement results measured at the user A's position. On the other hand, in FIG. 16, reference numerals 43B-46B are basically the same as those shown in FIG. The user A is positioned directly below the exhaust port 36 of the acoustic duct 33, but the user B is positioned on the right side of the user A in the X direction.

FIG. 17 is a diagram showing waveforms of direct sound and cross sound of user B in acoustic device 30 with ventilation function according to Embodiment 1. In FIG. In FIG. 17, the direct sound R (reference 43B), the direct sound L (reference 45B), the cross sound RL (reference 44B), and the cross sound LR (reference 46B) received by the microphones 50R and 50L of the user B are shown. waveforms. In FIG. 17, the horizontal axis is time and the vertical axis is phase. As shown in FIG. 17, it can be seen that there is a time difference between the arrival times of these four sounds. Furthermore, comparing FIG. 17 and FIG. 13, it can be seen that the arrival times of the four sounds in FIG. 17 are delayed by the third delay time from the arrival times of the four sounds in FIG.

Using this principle, the second phase control section 342c, which will be described later, performs the following processing to obtain the four waveforms shown in FIG. 18 from the four waveforms shown in FIG. FIG. 18 is a diagram showing waveforms of sound waves output from the second phase control section 342c provided in the acoustic device 30 with ventilation function according to the first embodiment. In FIG. 18, the horizontal axis is time and the vertical axis is phase.

First, as shown in FIG. 16, two speaker units 322L and 322R are installed at the left and right ears of user B (reference numeral 80). Next, a model of user B is arranged in the basket 5 . A microphone 50R is installed in the right ear of the user B model, and a microphone 50L is installed in the left ear.

Next, a test sound is emitted from the two speaker units 322L and 322R installed at the positions shown in FIG. 16, and the test sound is received by the microphones 50R and 50L to perform binaural measurement. In binaural measurement, direct sound and cross sound are measured as differences in propagation time. The test sound used at this time is, for example, white noise signal-processed at the same sound pressure level in all frequency bands. At each measurement point, propagation time characteristics in white noise reproduction are recorded, FFT (Fast Fourier transform) analysis is performed on the measurement results at each measurement point, and phase characteristics are measured.

To simplify the explanation, the speaker unit 322 on the right side of User B's model is hereinafter referred to as speaker unit 322R, and the speaker unit 322 on the left side is referred to as speaker unit 322L, as shown in FIG. The order of reproducing the test sound from the speaker unit 322 is (1) only the speaker unit 322R, (2) only the speaker unit 322L, and (3) both the speaker units 322R and 322L. In this way, when the number of speaker units 322 is two, the test sounds are reproduced one by one in order, and finally the test sounds are simultaneously reproduced from both sides. By the reproduction, information on the radiation characteristics in the cage 5 when each speaker unit 322 radiates the test sound separately, and information on the radiation characteristics in the cage 5 when all the speaker units 322 radiate the test sound simultaneously. and can be obtained. As in the above, the order of (1) and (2) may be reversed, and (3) may be omitted.

In this way, when the test sound is reproduced in the cage 5, four sound wave waveforms 43B to 46B in FIG. 17 are obtained. Also, based on the waveforms 43B to 46B of the four sound waves, the delay time of the cross sound RL (reference 44B) with respect to the direct sound R (reference 43B) is obtained. This delay time is called a fourth delay time. Similarly, based on the waveforms 43 to 46 of the four sound waves, the delay time of the cross sound LR (reference 46B) with respect to the direct sound L (reference 45B) is obtained. This delay time is called a fifth delay time. The fourth delay time and the fifth delay time are stored in the storage unit 343 of the acoustic device 30 with ventilation function as the second control pattern.

Next, the second phase control section 342c obtains the absolute value of the negative phase component 47 of the direct sound R (reference numeral 43B) shown in FIG. 17 and adds it to the positive phase component 48 of the direct sound R (reference numeral 43B). do. Similarly, the first phase control section 342b obtains the absolute value of the negative phase component 47 of the direct sound L (reference numeral 45B) and adds it to the positive phase component 48 of the direct sound L (reference numeral 45B). The first phase control section 342b also performs the same processing for the cross sound RL (reference numeral 44B) and the cross sound LR (reference numeral 46B).

Further, the second phase control section 342c controls the amplitude and phase of the waveform of the direct sound R (reference numeral 43B) and the waveform of the direct sound L (reference numeral 45B) to align them with the same amplitude and phase. Further, the second phase control section 342c controls the amplitude and phase of the waveform of the cross sound RL (reference numeral 44B) and the waveform of the cross sound LR (reference numeral 45B) to align them with the same amplitude and the same phase. In FIG. 17, comparing the direct sound R (reference numeral 43B) and the cross sound RL (reference numeral 44B) received by the microphones 50R and 50L, there is not only a difference in propagation time but also a clear difference in sound pressure level. It can be seen that there is a difference. Similarly, in FIG. 17, comparing the direct sound L (reference numeral 45B) and the cross sound LR (reference numeral 46B) reveals that there is not only a difference in propagation time but also a clear difference in sound pressure level. Accordingly, the second phase control section 342c performs control to make the amplitude of the waveform of the direct sound R (reference numeral 43B) and the waveform of the cross sound RL (reference numeral 44B) equal to each other. Similarly, the second phase control section 342c performs control to make the amplitudes of the direct sound L (reference numeral 45B) and the cross sound LR (reference numeral 46B) equal to each other.

Then, the second phase control section 342c delays the waveform of the direct sound L (reference numeral 45B) from the waveform of the cross sound LR (reference numeral 46B) by the fifth delay time.

On the other hand, in the second phase control, the waveform of the direct sound R (symbol 43B) may be earlier than the waveform of the cross sound RL (symbol 44B). 43B) is not delayed from the waveform of the cross sound RL (reference numeral 44B).

However, the second phase control unit 342c divides the two waveforms of the direct sound R (reference 43B) and the cross sound RL (reference 44B) into the direct sound L (reference 45B) and the cross sound LR (reference 44B) by the sixth delay time. 46B) are delayed from the two waveforms.

This gives the four waveforms of FIG. In FIG. 18, the cross sound LR (reference numeral 46B) is radiated first. Next, the direct sound L (reference numeral 45B) is radiated with a delay of the fifth delay time. After that, the direct sound R (reference numeral 43B) is emitted with a delay of the sixth delay time, and finally the cross sound RL (reference numeral 44B) is emitted with a delay of the fourth delay time.

Depending on the positions of user A and user B, radiated sounds from speaker units 322R and 322L arrive at user B with a delay. Therefore, in order for the radiated sounds to reach the users B and A at the same time, as shown in FIG. , should be emitted at an early timing. FIG. 19 is a diagram showing waveforms of sound waves output from the first phase control section 342b and the second phase control section 342c provided in the acoustic device 30 with ventilation function according to the first embodiment. In FIG. 19, the horizontal axis is time and the vertical axis is phase. 19, the upper stage shows the four waveforms of FIG. 14, and the lower stage shows the waveforms of FIG. The four waveforms in the lower part of FIG. 18 are radiated earlier than the four waveforms in the upper part of FIG. 14 by the third delay time. As a result, radiated sounds arrive at the user A and the user B at the same time.

In this manner, the second phase control section 342c stores the third delay time, the fourth delay time, the fifth delay time, and the sixth delay time in advance in the storage section 343 as the second control pattern. . The second phase control section 342c delays the waveform of the direct sound L (reference numeral 45B) from the waveform of the cross sound LR (reference numeral 46B) by a fifth delay time. Then, the second phase control unit 342c shifts the direct sound R (reference 43B) and the cross sound RL (reference 44B) from the waveforms of the direct sound L (reference 45B) and the cross sound LR (reference 46B) by the sixth delay time. ) waveform. In the second phase control unit 342c, as the process of aligning to the same amplitude and the same phase and the process of delaying the emission time, for example, filter processing such as FIR (Finite Impulse Response) or IIR (Infinite Impulse Response) is used. . As a result, a sound field 52 with a feeling of high sound quality can be generated in the cage 5. - 特許庁

In the above description, in order to simplify the description, when measuring the test sound, the microphones 50R and 50L are installed at one location for the user A and the user B, respectively. An example was described. However, as shown in FIG. 15, measurements may be made at a plurality of measurement points. In FIG. 15, propagation time characteristics in white noise reproduction are recorded at at least three points of 10 cm, 50 cm, and 1 m in the direction of 45 degrees from the center of the exhaust port 36 of the acoustic duct 33 . It should be noted that 45 degrees here refers to an angle that is slanted 45 degrees to the right from the direction directly below the center of the exhaust port 36. Therefore, these three points are only 45 degrees with respect to the central axis F. It is set along a virtual axis G inclined to the right. The virtual axis G exists in the same XZ plane as the central axis F. Also, the microphone 50R and the microphone 50L are installed with a distance corresponding to the width of the head of the user 80 apart. However, FIG. 15 is merely an example, and is not limited to 10 cm, 50 cm, 1 m, and 45 degrees, and these distances and angles may be changed as appropriate. By measuring at a plurality of measurement points in this manner, the propagation time characteristics can be analyzed with higher accuracy.

Only one kind of the third to sixth delay times may be stored in the storage unit 343 as the second control pattern. The reason for this is that the third to sixth delay times are not always constant, and change depending on the duct length L of the acoustic duct 33, the capacity of the cage 5, or the like. Therefore, the data in FIG. 17 may be measured for each elevator having a different duct length and for each elevator having a different car 5 capacity. A plurality of second control patterns may be prepared for each duct length and stored in the storage unit 343 (see FIG. 22). Similarly, a plurality of second control patterns may be prepared for each capacity of the basket 5 and stored in the storage unit 343 (see FIG. 23). Further, a plurality of second control patterns may be prepared for each duct length and each capacity of the basket 5 and stored in the storage unit 343 (see FIG. 24). 22 to 24 will be described later. 22 to 24, the first control pattern and the second control pattern are paired and stored in the storage unit 343 as one "control pattern".

In this way, the second phase control unit 342c, as shown in FIG. A direct sound R (reference numeral 43B) and a cross sound RL (reference numeral 44B) are emitted in this order.

Also, as shown in FIG. 20, assume that user C (reference numeral 80) is on the left side of user A (reference numeral 80). FIG. 20 is a diagram showing a state in which user C is on the left side of user A in acoustic device 30 with a ventilation function according to Embodiment 1. As shown in FIG. In that case, the second phase control section 342c performs similar phase control on the user C on the left side in the car 5 as well. Then, the second phase control unit 342c controls the cross sound RL (reference 44B), the direct sound R (reference 43B), the direct sound L (reference 45B), the cross The sound LR (reference numeral 46B) is emitted in order.

Furthermore, as shown in FIG. 21, suppose that user D (reference numeral 80) is in front of user A (reference numeral 80). FIG. 21 is a diagram showing a state in which user D is in front of user A in acoustic device 30 with a ventilation function according to Embodiment 1. FIG. In that case, the microphones 50R and 50L are installed in a direction inclined forward by 45 degrees with respect to the central axis F, and the measurement is performed. Then, the second phase control section 342c performs similar phase control on the user D who is on the left side in the car 5 as well.

In Embodiment 1, as described above, the left and right speaker units 322 are separately driven to emit white light in the directions of 45 degrees and 90 degrees at at least three locations of 10 cm, 50 cm, and 1 m from the opening of the acoustic duct 33 . Play noise. The propagation time characteristics at that time are recorded, and the phase characteristics at each measurement point are measured. From this characteristic, it is possible to confirm the frequency characteristics of the radiated sound of the speaker in an arbitrary direction, and the frequency characteristics having the resonance effect due to the standing wave in the acoustic duct 33 become clear.

Next, an impulse response sound is generated from each speaker unit 322, and the characteristics at each of the measurement positions and angles are confirmed. As for this characteristic, it is possible to confirm the time delay between the driving of the speaker unit 322 and the point of measurement. Next, the two speaker units 322 are driven at the same time, and phase characteristics and time waveforms between the speaker units 322 based on impulse characteristics in each angular direction are analyzed.

Basically, before control, the radiated sound emitted from the two speaker units 322 has an output sound pressure In most cases, the sound pressure level (SPL) of the frequency response is measured to be the highest. This is due to the same function as a general speaker system, and on the center axis F between the left and right speaker units 322, the reproduced sounds of the two speaker units 322 create a reproduced sound field as crosstalk. due to that. Therefore, in the first embodiment, by performing the above-described first phase control and second phase control, sound field control for improving the characteristics of the sound pressure level (SPL) gathered on the central axis F is performed. conduct.

Basically, it is desirable to obtain a similar sound pressure level (SPL) at any measurement angle.

(1) The first phase control delays or advances the phases of the two speaker units 322 converging on the central axis F, thereby shifting the phases. This correction work is performed in fine frequency units of 1/3 octave or more, and time processing is performed so that the phases of the sounds emitted from the two speaker units 322 are not matched. However, the phase control is performed within 300 ms, which is subjected to subjective evaluation that it is difficult to perceive changes in sound due to time delay or advance in consideration of human auditory sensitivity characteristics. As a result, it is possible to change the acoustic characteristics due to time delay and advance, and to change the acoustic characteristics synthesized on the central axis of the opening.

(2) A wide reproduction sound field state can be created by performing the same phase control separately for each speaker unit 322 and at all angles.

<Frequency control based on duct length>
Next, the frequency band that resonates with respect to the duct length of the acoustic duct 33 will be described. The frequency at which the resonance phenomenon occurs can be calculated by the following formula (1).

L=C/(4×f) (1)

where L is the duct length, C is the speed of sound, and f is the frequency.

The frequency f shown in the above formula (1) is a frequency that matches the standing wave frequency of the acoustic duct 33 . Therefore, if the frequency of the acoustic content 40 matches the standing wave frequency of the acoustic duct 33 , a resonance phenomenon occurs inside the acoustic duct 33 . That is, when at least part of the frequency band of the acoustic content 40 satisfies the above formula (1), the at least part of the frequency band of the acoustic content 40 and the standing wave frequency of the acoustic duct 33 match. A resonance phenomenon occurs.

As described above, the duct length of the acoustic duct 33 differs from cage 5 to cage 5 . Comparing the case of FIG. 5 with the case of FIG. 8, the duct length of FIG. 5 is about 50 cm to 100 cm, while the duct length of FIG. 8 is 200 cm or longer, which is shorter. As can be seen from the above formula (1), the resonantly generated frequency f varies depending on the duct length L.

Therefore, it is possible to adjust the duct length in order to obtain a preferable low frequency, but at a low frequency of 100 Hz or less, an echo due to low frequency sound with low attenuation occurs in the cage 5 which is a metal housing. Because it becomes easier, it may affect human tinnitus.

Therefore, it is desirable to use a duct length aimed at improving low frequencies in the frequency band of 100 Hz or higher. By doing so, low frequencies with wide directivity are localized above the user's head, so that it is easy to obtain a sense of sound localization (a sense of spread of sound) due to wide directivity of low frequencies.

Thus, the duct length L of the acoustic duct 33 and the frequency f at which the resonance phenomenon occurs are in an inversely proportional relationship, and the duct length L of the acoustic duct 33 changes the frequency f at which resonance occurs. Therefore, in Embodiment 1, the frequency band of the acoustic content 40 is set such that at least part of the frequency band of the acoustic content 40 matches the standing wave frequency of the acoustic duct 33 . That is, based on the duct length L of the acoustic duct 33 and using the above equation (1), the frequency f at which the resonance phenomenon occurs is obtained. Then, the acoustic content 40 is generated or the frequency of the acoustic content 40 is changed so that the acoustic content 40 has a frequency band including the frequency f.

<Switching of control pattern based on duct length>
Since the propagation time of the direct sound and the cross sound changes depending on the duct length of the acoustic duct 33, as a result, the first delay time and the second delay time explained using FIG. 13 and the delay time explained using FIG. The third through sixth delay times vary. Therefore, in the first embodiment, in the above-described first phase control and second phase control, the duct length L is ranked and classified based on the length, and the control pattern is switched for each duct length. As the control pattern, a control pattern for the first phase control of the first phase control section 342b and a control pattern for the second phase control of the second phase control section 342c are prepared in advance as one pair. and stored in the first control table 60 shown in FIG. FIG. 22 is a diagram showing an example of the first control table 60 used in the sound control section 342 of the sound device 30 with ventilation function according to the first embodiment. In the first control table 60, three types of duct length L are prepared: duct length L1, duct length L2, and duct length L3. The size relationship of these duct lengths satisfies the relationship of duct length L1<duct length L2<duct length L3. That is, the duct length L1 is the shortest and the duct length L3 is the longest.

In the first control table 60, a control pattern A, a control pattern B, and a control pattern C are stored corresponding to each of the duct length L1, the duct length L2, and the duct length L3. That is, the first control table 60 predetermines the correspondence relationship between the duct length and the control pattern. Further, in the control pattern A, a first control pattern A1 for the first phase control of the first phase control section 342b and a second control pattern A2 for the second phase control of the second phase control section 342c are paired. included. Similarly, in the control pattern B, a first control pattern B1 for the first phase control of the first phase control section 342b and a second control pattern B2 for the second phase control of the second phase control section 342c are paired. is included. Thus, each control pattern includes a first control pattern for first phase control and a second control pattern for second phase control. Therefore, the elevator installation worker selects the duct length using the selection button 38a of the selector switch 38 (see FIG. 2). Since one of the control patterns A, B, and C is specified by the selection, the first control pattern for the first phase control and the second control pattern for the second phase control can be specified at the same time. The selector switch 38 is operated by a worker who installs the elevator system 1 or the acoustic device 30 with a ventilation function. Therefore, the selector switch 38 may be provided in the control section 34 installed on the ceiling section 5c of the basket 5, as shown in FIG. Alternatively, the selector switch 38 may be provided on the elevator control panel 7 or the car operating panel 5f in the car 5. In any case, the switch 38 is installed so that the user 80 cannot operate it.

<Switching of control pattern based on the volume of basket 5>
Next, the case of switching the control pattern with respect to the volume of the basket 5 will be described. As shown in FIG. 16, the distance between user A and user B varies depending on the size (that is, volume) of basket 5 . That is, as described with reference to FIG. 15, even if the data is measured on the virtual axis G inclined 45 degrees to the right from the central axis F, depending on the size of the basket 5, the position of the user B may vary even at the same 45 degrees. will be different. When the size of the basket 5 is large, the distance between the user A and the user B is large, and when the size of the basket 5 is small, the distance between the user A and the user B becomes smaller. Therefore, the propagation time of direct sound and cross sound to user B changes depending on the size of car 5 . In addition, the propagation times of the direct sound and the cross sound also slightly change for the user A directly below the exhaust port 36 . As a result, the first and second delay times described using FIG. 13 and the fourth and fifth delay times described using FIG. 17 change. Therefore, in Embodiment 1, in the above-described first phase control and second phase control, the cages 5 are ranked and classified based on their volumes, and the control pattern is switched for each volume of the cages 5 .

It is desirable to select an appropriate control pattern based on the size of the basket 5 in order to obtain a favorable sound spread. In particular, in the second phase control, as described with reference to FIG. 16, for a user who is not in the center of the car 5, such as user B, radiation It is necessary to control the phase of sound. At this time, unless the control pattern is switched based on the size of the basket 5, the effect of phase control cannot be sufficiently obtained.

Since the size of the basket 5, that is, the dimensions of the basket 5 can be considered as the volume of the basket 5, in the first embodiment, the volume of the basket 5 is ranked and classified according to the capacity of the basket 5. do. The capacity of the car 5 is determined in advance. Specifically, the capacity of the car 5 is determined in advance, such as 11-seater, 12-seater, and 15-seater.

Therefore, in Embodiment 1, the first control pattern of the first phase control of the first phase control section 342b and the second control pattern of the second phase control of the second phase control section 342c are paired as one pair, A plurality of each are prepared in advance and stored in the second control table 61 shown in FIG. FIG. 23 is a diagram showing an example of the second control table 61 used in the sound control section 342 of the sound device 30 with ventilation function according to the first embodiment. In the second control table 61, three types of volume V1, volume V2, and volume V3 are prepared as the volume of the basket 5. FIG. The magnitude relationship between these volumes satisfies the relationship of volume V1<volume V2<volume V3. That is, the volume V1 is the smallest and the volume V3 is the largest.

In the second control table 61, a control pattern P, a control pattern Q, and a control pattern R are stored corresponding to each volume V1, volume V2, and volume V3. Further, in the control pattern P, a first control pattern P1 for the first phase control of the first phase control section 342b and a second control pattern P2 for the second phase control of the second phase control section 342c are paired. included. Similarly, in the control pattern Q, a first control pattern Q1 for the first phase control of the first phase control section 342b and a second control pattern Q2 for the second phase control of the second phase control section 342c are paired. is included. Thus, each control pattern includes a first control pattern for first phase control and a second control pattern for second phase control. Therefore, the elevator installation worker selects the volume of the car 5 using the selection button 38b provided on the selector switch 38 (see FIG. 2). Since one of the control patterns P, Q, and R is determined by the selection, the first control pattern for the first phase control and the second control pattern for the second phase control can be specified at the same time.

<Switching of control pattern based on duct length and capacity of basket 5>
FIG. 24 is a diagram showing an example of the third control table 62 used in the sound control section 342 of the sound device 30 with ventilation function according to the first embodiment. In the third control table 62, control patterns A to I are stored for each duct length L1, duct length L2, and duct length L3, and for each volume V1, volume V2, and volume V3. Therefore, the elevator installation worker selects the duct length and the volume of the car 5 using the selection buttons 38a and 38b of the selector switch 38 (see FIG. 2). Since one of the control patterns A to I is specified by the selection, the control pattern for the first phase control and the control pattern for the second phase control can be specified at the same time.

<Sound content 40>
Next, the acoustic content radiated from the speaker unit 322 will be described using FIG. FIG. 25 is a diagram showing frequency characteristics of acoustic content radiated from the speaker unit 322 in the acoustic device 30 with ventilation function according to the first embodiment. FIG. 25 compares frequency characteristics at a position 50 cm away from the center of the exhaust port 36 .

In FIG. 25, the horizontal axis indicates frequency, and the vertical axis indicates sound pressure level. A solid line 70 indicates the frequency characteristics of the sound radiated from the fan 31a. That is, the solid line 70 indicates the frequency characteristics of noise generated as the fan 31a rotates.

A dashed line 71 indicates the frequency characteristics of the audio content 40, but indicates the case where phase control is not performed. On the other hand, a dotted line 72 indicates the frequency characteristics of the audio content 40 when the first phase control and the second phase control are performed.

The fan 31a is driven to rotate even when the acoustic content 40 is emitted. Therefore, the acoustic content 40 is masked so that the radiated sound (noise) generated from the fan 31a does not disturb the ears of the user. Specifically, the frequency band of the acoustic content 40 is substantially the same as the frequency band of the sound radiated from the fan 31a, and the sound pressure level of the acoustic content 40 is higher than the sound pressure level of the sound radiated from the fan 31a.

In the first embodiment, by adding another sound (acoustic content) to the sound radiated from the fan 31a, the sound pressure and frequency characteristics of the other sound make the sound radiated from the fan 31a less annoying. there is In other words, by masking the radiated sound of the fan 31a with another sound, the frequency of the sound is brought closer to the one that the user can hear comfortably. This reduces discomfort caused by the sound radiated from the fan 31a. In other words, the acoustic content also functions as auditory masking that reduces discomfort caused by the sound radiated from the fan 31a.

<Structure of Acoustic Control Unit 342 and Output Unit 344>
Next, the configurations of the acoustic control section 342 and the output section 344 provided in the control section 34 shown in FIG. 2 will be described with reference to FIG. FIG. 26 is a functional configuration diagram showing configurations of the acoustic control unit 342 and the output unit 344 provided in the control unit 34 of the acoustic device 30 with ventilation function according to the first embodiment.

Acoustic controller 342 includes acoustic controllers 342L and 342R. The sound control section 342L is provided for the speaker cabinet 321L. On the other hand, the sound control section 342R is provided for the speaker cabinet 321R.

As shown in FIG. 26, the acoustic control sections 342L and 342R each have an A/D converter 342a, a first phase control section 342b, and a second phase control section 342c. The sound control units 342L and 342R may further have a synthesizing unit 342d as shown in FIG.

The A/D converter 342a converts the audio content 40, which is an analog signal that is an input signal, into a digital signal.

The first phase control unit 342b performs first phase control on the acoustic content 40 converted into the digital signal. The control pattern used in the first phase control is a control pattern selected by either one of the duct length and the volume of the car 5 input to the selector switch 38 by the elevator installation worker. For example, as shown in FIG. 2, the changeover switch 38 is provided with buttons for selecting the duct length and the volume of the basket 5 . The first phase control unit 342b selects one of the first control table 60, the second control table 61, and the third control table 62 based on the duct length and the volume of the basket 5 input to the switch 38, Select the corresponding control pattern.

The second phase control unit 342c performs second phase control on the acoustic content 40 converted into the digital signal. The control pattern used in the second phase control is a control pattern selected by either one of the duct length and the volume of the car 5 input to the selector switch 38 by the elevator installation worker. The second phase control unit 342c selects one of the first control table 60, the second control table 61, and the third control table 62 based on the duct length and the volume of the basket 5 input to the switch 38, Select the corresponding control pattern.

The combiner 342d combines the signal output from the first phase controller 342b and the signal output from the second phase controller 342c.

Output section 344 includes output sections 344L and 344R. The output section 344L is provided for the speaker cabinet 321L. On the other hand, the output section 344R is provided for the speaker cabinet 321R.

The output sections 344L and 344R each have a D/A converter 344a and an amplifier 344b, as shown in FIG.

The D/A converter 344a converts the digital signals output from the acoustic control units 342L and 342R into analog signals.

Amplifier 344b amplifies the analog signal output from D/A converter 344a and outputs the amplified signal to speaker units 322L and 322R. As a result, the speaker units 322L and 322R radiate sound based on the acoustic content 40 toward the interior of the car 5. FIG.

<Mounting example (modification) of speaker cabinet 321>
In the first embodiment described above, the mounting method of the speaker cabinet 321 has been described with reference to the example shown in FIG. In FIG. 3 , speaker cabinets 321 are arranged on the left and right sides of the downstream space 33 b of the acoustic duct 33 . A radiation surface 322 a of the speaker unit 322 that radiates sound is arranged toward the downstream space 33 b of the acoustic duct 33 . Specifically, the radiation surface 322a of the speaker unit 322R faces the right side X1 in the X direction, and the radiation surface 322a of the speaker unit 322L faces the left side X2 in the X direction. However, the mounting method of the speaker cabinet 321 is not limited to the case of FIG. Modifications of the mounting method of the speaker cabinet 321 will be described below.

FIG. 27 is a front view showing Modification I of the mounting method of the speaker cabinet 321 in the acoustic device 30 with ventilation function according to the first embodiment. 28 is a plan view of Modification I of FIG. 27. FIG. As described above, in the acoustic duct 33, the space between the fan 31a and the exhaust port 36 is called the downstream space 33b. The downstream space 33b is a box-shaped space, and as shown in FIGS. 27 and 28, the longitudinal direction extends in the X direction and the lateral direction extends in the Y direction. As shown in FIG. 28, in modification I, a speaker unit 322L and a speaker unit 322R are arranged side by side in the X direction. That is, the speaker unit 322L and the speaker unit 322R are installed on a wide surface in the longitudinal direction of the downstream space 33b. Both the radiation surface 322a of the speaker unit 322L and the radiation surface 322a of the speaker unit 322R are arranged facing the downstream space 33b of the acoustic duct 33. As shown in FIG. However, in Modification I, as shown in FIGS. 27 and 28, the radiation surface 322a of the speaker unit 322L and the radiation surface 322a of the speaker unit 322R both face the back side Y2 in the Y direction.

FIG. 29 is a front view showing Modification II of the mounting method of the speaker cabinet 321 in the acoustic device 30 with ventilation function according to Embodiment 1. FIG. 30 is a plan view of Modification II of FIG. 29. FIG. As shown in FIG. 30, in Modification II, speaker cabinets 321R and 321L are arranged in a staggered manner. Specifically, in Modification II, the speaker unit 322R is arranged on the left side X2 in the X direction of the downstream space 33b and on the back side Y2 of the downstream space 33b. On the other hand, the speaker unit 322L is arranged on the right side X1 in the X direction of the downstream space 33b and on the front side Y1 of the downstream space 33b. In addition, the speaker unit 322L and the speaker unit 322R are installed separately on two wide surfaces facing each other in the longitudinal direction of the downstream space 33b. Also, the radiation surface 322a of the speaker unit 322L and the radiation surface 322a of the speaker unit 322R are both arranged facing the downstream space 33b of the acoustic duct 33. As shown in FIG.

FIG. 31 is a front view showing Modification III of the mounting method of the speaker cabinet 321 in the acoustic device 30 with ventilation function according to the first embodiment. FIG. 32 is a plan view of Modification III of FIG. 31. FIG. As shown in FIG. 31, in Modification III, both speaker cabinets 321R and 321L are arranged above an installation frame 31b that houses a fan 31a. Also, the speaker unit 322L and the speaker unit 322R are arranged side by side in the X direction. Both the radiation surface 322a of the speaker unit 322L and the radiation surface 322a of the speaker unit 322R are arranged toward the downstream space 33b of the acoustic duct 33 via the installation frame 31b. In Modification III, both the radiation surface 322a of the speaker unit 322L and the radiation surface 322a of the speaker unit 322R face downward Z2 in the Z direction.

In this manner, in Modification I, the speaker unit 322L and the speaker unit 322R are arranged on a wide surface in the longitudinal direction of the downstream space 33b. In Modification II, speaker units 322L and 322R are staggered on two wide surfaces in the longitudinal direction of the downstream space 33b. Further, in Modification III, the speaker unit 322L and the speaker unit 322R are arranged so as to emit sound through the fan 31a.

In each of Modifications I to III, sound is radiated through an acoustic duct 33 having a narrow opening, and is a method of radiating sound riding on the wind of a fan 31a. Therefore, sound can be radiated without disturbing the fluid by the fan 31a. In addition, since the speaker units 322R and 322L are installed via the acoustic duct 33, the sound propagation path follows the same path regardless of the installation method. Therefore, sound field control itself can obtain the same effect.

<Effect of Embodiment 1>
As described above, according to the acoustic device 30 with ventilation function according to Embodiment 1, the wall surface of the acoustic duct 33 forms an air path for ventilation air flowing from the intake port 35 toward the exhaust port 36. , functions as a diaphragm of the speaker unit 322 . As a result, it is possible to create a sound field environment capable of improving the sound quality while ventilating the cage 5, which is the space to be ventilated.

In Embodiment 1, two or more speaker cabinets 231 are installed. Also, by performing acoustic radiation using the acoustic duct 33, a sound field expansion space radiated from the narrow exhaust port 36 is created above the head of the user 80 in the car 5 of the closed elevator. Therefore, the user 80 can feel that the narrow space inside the basket 5 is a wide space due to the effect of the sound field 52 . The user 80 can audibly feel the sound field 52 at the same time as getting on the car 5, and can reduce the stress when getting on the car in a narrow environment with a stranger. In addition, it is possible to use the ventilation air duct as a bass enhancement duct for sound radiation, and the sound field control with phase control and the wide directivity characteristics of low frequencies add a sense of localization of sound. As a result, a wide sound field space can be constructed overhead. Also, even for an existing elevator in which a new acoustic device cannot be installed, the acoustic device 30 with a ventilation function can be installed in the existing elevator by using the air pipe of the existing ventilation fan as the acoustic duct 33. be able to.

In the above description, the duct length L shown in FIGS. 22 and 24 used in the first phase control and the second phase control is the total length of the acoustic duct 33 in the pipe axis direction. However, it is not limited to that case. The downstream space 33 b of the acoustic duct 33 has a greater influence on the propagation time of sound waves than the upstream space 33 a of the acoustic duct 33 . Therefore, the duct length L shown in FIGS. 22 and 24 used in the first phase control and the second phase control may be the length of the downstream space 33b of the acoustic duct 33 in the axial direction.

1 elevator system, 2 hoistway, 3 hoisting machine, 3a sheave, 4 main rope, 5 basket, 5a side plate, 5b floor plate, 5c ceiling part, 5ca lower surface, 5d basket door, 5e ceiling light, 5ea irradiation surface, 5f Car operating panel, 5h Intercom device, 6 Counterweight, 7 Elevator control panel, 8 Control cable, 9 Car control device, 9a Input unit, 9b Control unit, 9c Output unit, 9d Storage unit, 30 Acoustic device with ventilation function, 31 Ventilation function part 31a Fan 31aa Motor 31ab Wing part 31b Installation frame 32 Acoustic function part 33 Acoustic duct 33a Upstream space 33b Downstream space 34 Control part 35 Intake port 36 Exhaust port 37 filter, 38 changeover switch, 38a selection button, 38b selection button, 40 acoustic content, 43 waveform, 43B waveform, 44 waveform, 44B waveform, 45 waveform, 45B waveform, 46 waveform, 46B waveform, 47 phase component, 48 phase component, 50 microphone, 50L microphone, 50R microphone, 52 sound field, 60 first control table, 61 second control table, 62 third control table, 70 solid line, 71 dashed line, 72 dotted line, 80 user, 231 speaker cabinet, 232 speaker Unit 233 speaker unit 321 speaker cabinet 321L speaker cabinet 321R speaker cabinet 321a housing 321b front 322 speaker unit 322-1 speaker unit 322-2 speaker unit 322L speaker unit 322R speaker unit 322a Radiation surface 341 ventilation control unit 342 acoustic control unit 342L acoustic control unit 342R acoustic control unit 342a A/D converter 342b first phase control unit 342c second phase control unit 342d synthesis unit 343 storage section, 344 output section, 344L output section, 344R output section, 344a D/A converter, 344b amplifier, 432 acoustic control section, E arrow, F central axis, G virtual axis, H1 height dimension, H2 height dimension, L duct length, L1 duct length, L2 duct length, L3 duct length, S1 cross-sectional area, S2 cross-sectional area, W1 width dimension, W2 width dimension, X1 right side, X2 left side, Y1 front side, Y2 back side, Z2 downward direction, f frequency.

Claims (16)

an acoustic duct provided for a ventilated space to be ventilated and having an intake port and an exhaust port;
a fan that is provided for the acoustic duct and is rotationally driven to discharge the air taken in from the intake port to the space to be ventilated from the exhaust port;
two or more speaker cabinets provided to the acoustic duct and radiating sound waves toward the interior of the acoustic duct;
with
Each of the speaker cabinets includes:
a speaker unit having a radiation surface that radiates the sound wave, the radiation surface being arranged toward the inside of the acoustic duct;
the sound waves radiated from the radiation surface are radiated from the exhaust port of the acoustic duct toward the space to be ventilated;
The wall surface of the acoustic duct is
forming an air passage for the air for ventilation flowing from the intake port toward the exhaust port and functioning as a diaphragm of the speaker unit;
Acoustic device with ventilation. When comparing the cross-sectional area when cut by a virtual plane that intersects the direction of air flow,
the cross-sectional area of the inner dimension of the acoustic duct is smaller than the cross-sectional area of the ventilated space;
The acoustic device with a ventilation function according to claim 1. At least part of the frequency band of the sound wave emitted from the speaker unit matches the standing wave frequency of the acoustic duct, and the part of the frequency band of the sound wave and the standing wave frequency of the acoustic duct are different. Resonate,
The acoustic device with ventilation function according to claim 1 or 2. an acoustic control unit to which acoustic content is input, performs phase control processing on the acoustic content, and emits sound waves based on the acoustic content from the speaker cabinet into the space;
Acoustic device with ventilation function according to any one of claims 1 to 3. The acoustic control unit is
Having a first phase control unit that performs a first phase control as the phase control process,
The first phase control section is
Based on the difference in propagation time between the direct sound reaching one virtual microphone and the cross sound reaching the other virtual microphone when the sound wave radiated from the radiating surface reaches a pair of virtual microphones, controlling the propagation characteristics of sound waves, performing the first phase control;
The acoustic device with a ventilation function according to claim 4. The first phase control section is
a difference in propagation time between the direct sound and the cross sound is stored in advance as a first control pattern;
Based on the first control pattern, the direct sound is delayed from the cross sound by a first delay time corresponding to the difference in propagation time, and is radiated from the radiation surface.
The acoustic device with a ventilation function according to claim 5. The acoustic control unit is
Having a second phase control unit that performs a second phase control as the phase control process,
The second phase control section is
performing the second phase control for controlling the propagation characteristics of the sound wave based on the directivity angle of the sound wave radiated from the radiation surface,
The second phase control section is
Direct sound reaching one virtual microphone and the other virtual microphone when the sound wave radiated from the radiating surface reaches a pair of virtual microphones for each of the directivity angles of the sound waves radiated from the radiating surface controlling the propagation characteristics of the sound wave based on the difference in propagation time from the cross sound reaching the
The acoustic device with ventilation function according to any one of claims 4 to 6. The second phase control section is
a difference in propagation time between the direct sound and the cross sound for each directivity angle of the sound wave is stored in advance as a second control pattern;
controlling the order in which the direct sound and the cross sound are emitted based on the second control pattern;
The acoustic device with a ventilation function according to claim 7. The speaker cabinet is arranged separately to the left and right with respect to the exhaust port of the acoustic duct,
The pair of virtual microphones are arranged in the space to be ventilated so as to be divided into left and right,
A sound wave radiated from the radiation surface of the speaker unit of the left speaker cabinet and reaching the virtual microphone arranged on the left side is assumed to be a direct sound L,
A sound wave radiated from the radiation surface of the speaker unit of the right speaker cabinet and reaching the virtual microphone arranged on the right side is defined as a direct sound R,
A cross sound LR is a sound wave radiated from the radiation surface of the speaker unit of the left speaker cabinet and reaching the virtual microphone arranged on the right side;
When a sound wave radiated from the radiation surface of the speaker unit of the right speaker cabinet and reaching the virtual microphone arranged on the left side is a cross sound RL,
The second phase control section is
When radiating the sound wave toward the right side of the exhaust port of the acoustic duct,
The cross sound LR, the direct sound L, the direct sound R, and the cross sound RL are emitted from the radiation surface in this order;
The acoustic device with ventilation function according to claim 7 or 8. The speaker cabinet is arranged separately to the left and right with respect to the exhaust port of the acoustic duct,
The pair of virtual microphones are arranged in the space to be ventilated so as to be divided into left and right,
A sound wave radiated from the radiation surface of the speaker unit of the left speaker cabinet and reaching the virtual microphone arranged on the left side is assumed to be a direct sound L,
A sound wave radiated from the radiation surface of the speaker unit of the right speaker cabinet and reaching the virtual microphone arranged on the right side is defined as a direct sound R,
A cross sound LR is a sound wave radiated from the radiation surface of the speaker unit of the left speaker cabinet and reaching the virtual microphone arranged on the right side;
When a sound wave radiated from the radiation surface of the speaker unit of the right speaker cabinet and reaching the virtual microphone arranged on the left side is a cross sound RL,
The second phase control section is
When radiating the sound wave toward the left side of the exhaust port of the acoustic duct,
The cross sound RL, the direct sound R, the direct sound L, and the cross sound LR are emitted from the radiation surface in this order;
The acoustic device with ventilation function according to any one of claims 7 to 9. A storage unit that stores a control pattern in which the first control pattern and the second control pattern are paired,
The acoustic device with ventilation function according to any one of claims 1 to 10. The control pattern is set for each duct length of the acoustic duct,
The storage unit
storing a first control table in which the control pattern is set for each duct length of the acoustic duct;
The acoustic device with a ventilation function according to claim 11. The control pattern is set for each volume of the space to be ventilated,
The storage unit
storing a second control table in which the control pattern is set for each volume of the basket;
The acoustic device with a ventilation function according to claim 11. The control pattern is set for each duct length of the acoustic duct and for each volume of the space to be ventilated,
The storage unit
storing a third control table in which the control pattern is set for each duct length of the acoustic duct and for each volume of the space to be ventilated;
The acoustic device with a ventilation function according to claim 11. The space to be ventilated is the interior space of an elevator car,
The acoustic device with ventilation function according to any one of claims 1 to 14. a basket having the space to be ventilated therein;
The acoustic device with ventilation function according to any one of claims 1 to 15,
with
elevator system.

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