JP7438406B2 - Elevator sound system - Google Patents

Description

The present disclosure relates to an elevator acoustic system for emitting sound to a space within an elevator car.

Conventional elevator cars are equipped with speakers for providing audio guidance to users inside the car. Additionally, an intercom is installed inside the car so that users can talk to people outside in case of an emergency. These speakers and intercoms are installed, for example, on the car operation panel or the car ceiling.

Moreover, among conventional elevators, one has been proposed that plays not only voice guidance but also BGM (background music) inside the car (for example, see Patent Document 1). In the elevator, a speaker and a BGM reproducing device for reproducing BGM are provided in the car.

In the elevator described in Patent Document 1, the BGM reproducing device is electrically connected to an elevator control device, and a button information signal indicating a button operation by a user is input from the elevator control device. The BGM playback device controls the playback of BGM based on the button information signal from the elevator control device. Specifically, if a user wants to listen to the BGM that is being played from the beginning while the elevator is running, by pressing the door open button once, the BGM can be played from the beginning. . In addition, if the user wants to skip the BGM that they do not like and listen to the next BGM, they can play the next BGM from the beginning by pressing the door close button once while the elevator is running. Can be done. Furthermore, if the user does not want to listen to the BGM that is being played, he or she can stop the playback by pressing the door open button two or more times in succession while the elevator is running.

Generally, the space inside an elevator car is required to maintain a certain degree of airtightness and quietness. In special narrow closed spaces, such as the space inside an elevator car, which are different from normal living spaces, users are with people they do not know, and it is difficult to hold a conversation. As a result, many users feel "awkward" and "uncomfortable," and stress is caused by these feelings.

Japanese Patent Application Publication No. 2009-35340

As mentioned above, in the elevator described in Patent Document 1, the operation button inside the elevator is used to play or stop the BGM, so the user can play or stop the BGM by operating the operation button. Stopping can be controlled freely. Therefore, in some cases, there is a possibility that some users may play back the BGM without permission due to a prank. In that case, other passengers on the same ride may feel even more uncomfortable. As described above, the reproduction of BGM in Patent Document 1 does not necessarily reduce the user's stress caused by "awkwardness" and "discomfort," and in some cases, the user's stress may increase. There is a possibility.

Furthermore, in the elevator described in Patent Document 1, the BGM reproducing device has a configuration that acquires a button information signal from the elevator control device. Therefore, when installing the BGM reproducing device, it is necessary to electrically connect the BGM reproducing device and the elevator control device with a signal line. The task of wiring signal lines is complex and requires technical knowledge on the part of the workers, so it is practically difficult to install a BGM playback device in an existing elevator.

Furthermore, in Patent Document 1, since the volume when BGM is played is constant, the BGM is played at the same volume even when the elevator has stopped at a floor and the user is getting on and off the elevator. Therefore, important audio announcements to the user overlap with the BGM, and there is a possibility that the user may miss necessary information. Further, there is a problem in that the BGM playback sound is also radiated to the landing area of the stopping floor, and the sound emission becomes noise for people who do not use the elevator.

The present disclosure has been made in order to solve such problems, and the installation work is easy, and it is possible to provide audio content that reduces user stress without causing the negative effects of voice announcements to users. The purpose of the present invention is to obtain a sound system for an elevator.

An elevator acoustic system according to the present disclosure includes a speaker system disposed on the ceiling of an interior space of an elevator car, a storage unit that stores acoustic content emitted from the speaker system, and a storage unit that reproduces the acoustic content, a sound field control unit that causes the speaker system to radiate the acoustic content to an internal space of the car, and a detection unit that is provided in the car and detects a physical quantity indicating a running state of the car, The control unit determines the running state of the car based on the physical quantity detected by the detection unit, adjusts the sound pressure level of the audio content according to the running state of the car, and controls the sound field control unit and The detection unit is not electrically connected to an elevator control panel that controls the operation of the elevator , and is provided independently, and the detection unit is configured to detect when the car is ascending and descending. , detects the physical quantities indicating each of the states of accelerated running, constant speed running, decelerated running, and stop, and the sound field control unit is configured to detect whether the car is in the Determining whether the car is in an accelerated traveling state, the constant speed traveling, the decelerating traveling, or the stopped state, and adjusting the sound pressure level of the audio content in accordance with the determined state of the car. , the sound field control unit causes the speaker system to emit sound when it is determined that the car is in the deceleration running state during the ascent or the descent based on the physical quantity detected by the detection unit. A fade-out process is performed to gradually reduce the sound pressure level of the audio content .

According to the elevator sound system according to the present disclosure, the sound pressure level of the sound content is adjusted according to the running state of the car based on the detection result of the detection unit, so no information from the outside is required, and the installation work is easy. Furthermore, it is possible to provide audio content that reduces the stress of users without causing the negative effects of voice announcements to users.

1 is a perspective view showing the configuration of an elevator 1 according to Embodiment 1. FIG. FIG. 3 is a diagram showing the internal space of the car 5 of the elevator 1 according to the first embodiment. It is a figure which shows the example of the additional sound inserted into audio content for every season and every time of day. 1 is a front view showing the configuration of an acoustic system 13 according to Embodiment 1. FIG. FIG. 2 is a top view showing the arrangement of the speaker cabinet 20 of the audio system 13 according to the first embodiment. 1 is a side view showing an example of the configuration of a speaker cabinet 20 according to Embodiment 1. FIG. 7 is a front view showing the configuration of the speaker cabinet 20 of FIG. 6. FIG. FIG. 3 is a side view showing the configuration of a modification of the speaker cabinet 20 according to the first embodiment. 9 is a front view showing the configuration of the speaker cabinet 20 of FIG. 8. FIG. FIG. 3 is a front view schematically showing the configuration of a modified example of the acoustic system 13 according to the first embodiment. 7 is a plan view schematically showing the configuration of a further modified example of the acoustic system 13 according to the first embodiment. FIG. It is a front view showing the arrangement position of the detection part 21d. It is a top view which shows the arrangement position of the detection part 21d. It is a perspective view showing the composition of detection part 21d. It is a figure which shows an example of the waveform of the detection result by direction of the detection part 21d. It is a figure which shows the waveform of the output of the detection part 21d which the sound field control part 21a uses for determination. FIG. 6 is a diagram showing the relationship between the output of the detection unit 21d and the running speed of the car 5. FIG. It is a figure which shows the state change of the vibrating membrane 211a provided in the sensor element 211 of the detection part 21d when the cage|basket|car 5 rises. It is a figure which shows the waveform of the output voltage when the detection part 21d detects the acceleration when the cage|basket|car 5 rises. FIG. 5 is a diagram showing changes in the sound pressure level of audio content when the car 5 is raised. 5 is a diagram showing the state of the vibrating membrane 211a when the car 5 is lowered. FIG. 5 is a diagram showing the relationship between the output voltage of the detection unit 21d and the traveling speed of the car 5 when the car 5 is lowered. FIG. It is a figure which shows the relationship between the change of the sound pressure level of audio content and the output voltage of the detection part 21d when the cage|basket|car 5 descends. It is a figure which shows the threshold value set with respect to the output voltage of the detection part 21d. It is a figure which shows the threshold value set with respect to the output voltage of the detection part 21d. 3 is a diagram showing a configuration of a modification of the acoustic system 13 according to the first embodiment. FIG. It is a figure which shows the relationship between the detection result and the sound pressure level of audio content when the detection part 21d is an atmospheric pressure sensor.

Hereinafter, embodiments of an elevator acoustic 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 can be variously modified without departing from the gist of the present disclosure. Furthermore, the present disclosure includes all combinations of configurations that can be combined among the configurations shown in the following embodiments and modifications thereof. Furthermore, in each figure, the same reference numerals are the same or equivalent, and this is common throughout the entire specification. Note that in each drawing, the relative dimensional relationship or shape of each component may differ from the actual one.

Embodiment 1.
The elevator acoustic system according to the first embodiment is applied to a space inside an elevator car that is required to maintain a certain degree of airtightness and quietness. The space inside an elevator car is a space in which two or more people can exist, and the entrance and exit are closed, so that for a certain period of time, as a general rule, the people inside cannot go outside. It is space.

FIG. 1 is a perspective view showing the configuration of an elevator 1 according to the first embodiment. As shown in FIG. 1, an elevator 1 is installed in a building, and a car 5 ascends or descends within a hoistway 2. A hoisting machine 3 is provided at the top of the hoistway 2. A main rope 4 is stretched around a sheave 3a provided on the hoist 3. A car 5 and a counterweight 6 are connected to both ends of the main rope 4, respectively. The car 5 and the counterweight 6 are suspended from the sheave 3a by a main rope 4 in a hanging manner. Further, an elevator control panel 7 is installed at 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. Control cable 8 transmits power and control signals to car 5. The control cable 8 is also called a tail cord. As described above, the elevator 1 includes a hoisting machine 3, a main rope 4, a car 5, a counterweight 6, an elevator control panel 7, and a car control device 9, which will be described later.

The car 5 includes a floor plate 5b, a ceiling plate 5c, and four side plates 5a forming a periphery between the floor plate 5b and the ceiling plate 5c. The four side plates 5a are arranged on the right side, left side, front side, and rear side of the car 5, respectively. Further, a car door 5d is installed on the front side plate 5a of the four side plates 5a. When the car 5 stops at a landing on each floor of the building, the car door 5d engages with a landing door (not shown) installed at the landing to open and close the door.

On the upper surface of the ceiling plate 5c of the car 5, as shown in FIG. 1, a car control device 9 and a sound field control device 21 are installed. The car control device 9 controls the operation of each device provided in the car 5. Examples of devices provided in the car 5 include a car door 5d, a lighting device 5e (see FIG. 2), and a car operation panel 5f (see FIG. 2). The sound field control device 21 controls the overall operation of the elevator sound system 13 (see FIG. 4), which will be described later, so as to form a three-dimensional sound field 27 (see FIG. 4) throughout the interior space of the car 5. conduct. Hereinafter, the elevator sound system 13 will be simply referred to as the sound system 13.

A suspended ceiling 10 is fixed to the lower surface of the ceiling plate 5c of the car 5, as shown in FIG. A suspended ceiling 10 is located in the interior space of the car 5. The suspended ceiling 10 has a rectangular parallelepiped shape. The suspended ceiling 10 has four side surfaces 10a and a lower surface 10b (see FIG. 2). Although the upper part of the suspended ceiling 10 is open, the suspended ceiling 10 is not limited to this case, and the suspended ceiling 10 may further have an upper surface disposed opposite to the lower surface 10b. In the interior space of the suspended ceiling 10, a lighting device 5e (see FIG. 2), an emergency speaker 5g (see FIG. 2), and a speaker system 22 of the audio system 13 (see FIG. 4) are installed. In the above description, the sound field control device 21 is installed on the top surface of the ceiling plate 5c of the car 5, as shown in FIG. It may be arranged in the internal space of the suspended ceiling 10. Further, as shown in FIG. 2, there is a gap 11 of a certain distance D between the side surface 10a of the suspended ceiling 10 and the side plate 5a of the car 5 (see FIGS. 2 and 4). Hereinafter, the constant distance D will be referred to as a first distance D.

In addition, although the example of FIG. 1 shows the case where the elevator 1 is a rope elevator, it is not limited to this case. The elevator 1 may be another type of elevator, such as a linear elevator, for example.

FIG. 2 is a diagram showing the interior space of the car 5 of the elevator 1 according to the first embodiment. As shown in FIG. 2, the interior space of the car 5 is surrounded by four side plates 5a, a floor plate 5b, and a lower surface 10b of a suspended ceiling 10. The interior space of the car 5 has a rectangular parallelepiped shape, for example, except for the space 11. The floorboard 5b has a rectangular plane installed in a horizontal direction. Each side plate 5a has a rectangular plane installed in a vertical direction. Here, the perpendicular direction is, for example, the vertical direction. The lower surface 10b of the suspended ceiling 10 is arranged to face the floorboard 5b. The lower surface 10b of the suspended ceiling 10 is composed of a rectangular plane installed in a horizontal direction. The suspended ceiling 10 is provided with a lighting device 5e. The main body of the lighting device 5e is installed in the interior space of the suspended ceiling 10. The lighting device 5e is, for example, an LED lighting device. The illumination surface 5ea of the lighting device 5e faces the floorboard 5b, as shown in FIG. The lighting device 5e illuminates the interior space of the car 5 with light emitted from the irradiation surface 5ea. Further, the suspended ceiling 10 is provided with an emergency speaker 5g for broadcasting emergency messages from the building management room. The emergency speaker 5g may be used not only for making emergency calls, but also for making voice announcements such as "the door is closing" to the user.

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

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

The sound field control device 21 is one of the components of the acoustic system 13. The sound field control device 21 and a speaker system 22 (see FIG. 4), which will be described later, constitute the sound system 13. The sound field control device 21 and the speaker system 22 are not electrically connected to the car control device 9 and the elevator control panel 7. The car control device 9 and the elevator control panel 7 are operating systems that operate the elevator 1. In this way, the sound system 13 is an independent device from the operating system that operates the elevator 1, and does not require wiring work with the operating system, so it can be easily installed in the existing elevator 1. be.

As shown in FIG. 2, the sound field control device 21 includes a sound field control section 21a, an output section 21b, a storage section 21c, and a detection section 21d. Furthermore, the sound field control device 21 further includes a timer section 21e, if necessary. The sound field control unit 21a controls the operation of the entire sound system 13 so as to form a three-dimensional, high-quality sound field 27 (see FIG. 4) throughout the interior space of the car 5. Under the control of the sound field control section 21a, an acoustic signal based on the acoustic content is emitted in the sound field 27. The output unit 21b transmits a drive signal and audio content reproduction data to the speaker cabinet 20 under the control of the sound field control unit 21a. The storage unit 21c stores one or more audio contents in advance. The storage unit 21c further stores calculation results of the sound field control unit 21a, and various data and programs used in controlling the sound field control unit 21a.

The detection unit 21d detects physical quantities indicating the running state and stopped state of the car 5 of the elevator 1. The physical quantity is, for example, the traveling speed of the car 5, the acceleration of the car 5, the vibration of the car 5, or the atmospheric pressure that the car 5 is subjected to. The detection unit 21d transmits the detected physical quantity to the sound field control unit 21a. The sound field control unit 21a increases or decreases the sound pressure level at which the acoustic content is radiated based on the received physical quantity. Specifically, the sound field control unit 21a gradually increases the sound pressure level when the car 5 starts running and accelerates, and when the car 5 approaches the parking floor and starts decelerating. Gradually reduce the sound pressure level. Here, the sound pressure level means the volume. When the sound pressure level is high, the volume increases, and when the sound pressure level is low, the volume decreases. Details of the operations of the sound field control section 21a and the detection section 21d will be described later. The timer section 21e counts the current date and time. The timer unit 21e has month and day data and time data in the annual calendar. The sound field control unit 21a may obtain date and time data indicating the current date and time from the timer unit 21e, and may change the audio content based on the date and time data depending on the season and the time zone of daily life.

The audio content is generated by, for example, an externally installed audio content generation device 40, and is stored in advance in the storage unit 21c of the sound field control device 21. Alternatively, the audio content may be commercially available music stored on a CD, DVD, USB memory, or the like. In that case, the sound field control device 21 has an optical drive such as a CD drive or a USB connector, as required. In this way, the audio content in the first embodiment includes music generated by the dedicated audio content generation device 40, music that is generally commercially available, and the like. In this way, audio content refers to data in which various forms of "sound" are stored in arbitrary formats.

When the audio content generation device 40 generates audio content, for example, it generates the audio content by combining sounds from a plurality of sound sources that occur in the natural world. The audio content generation device 40 includes a signal processing section 40b that performs signal processing on audio content. The signal processing unit 40b performs one or more signal processes as necessary when generating audio content by combining sounds from a plurality of sound sources generated in the natural world. The signal processing may be performed before or after the sounds are combined. That is, signal processing may be performed after combining sounds from a plurality of sound sources, or conversely, after signal processing is performed on sounds from a plurality of sound sources, the sounds after signal processing may be combined. Examples of signal processing include a plurality of processes such as sound pressure level adjustment and phase control processing. The phase control processing includes pan processing, stereo expansion processing, and the like. Furthermore, the audio content generation device 40 includes an output section 40a, a storage section 40c, and an input section 40d. Sound data from sound sources generated in the natural world is input to the input section 40d. The sound data may be created based on data actually recorded in nature, or may be artificially created pseudo data. The output unit 40a outputs the generated audio content. The storage unit 40c stores the calculation results of the signal processing unit 40b, as well as various data and programs used in controlling the signal processing unit 40b.

Audio content that utilizes the sounds of the natural world, for example, can be experienced by anyone living in Japan, such as the seasons such as spring, summer, fall, and winter, and the time of day, such as dawn, daytime, evening, and night. It may be configured so that it can be felt from the sound. Thereby, even if the user uses the space inside the car 5 where the outside environment cannot be seen, the user can get a sense of the time zone and the season from the "sounds". In addition, the audio content does not have a hustle and bustle feel, and the content structure eliminates unpleasant factors such as noise, so that the user does not experience auditory discomfort. Specifically, the audio content is composed of a complex combination of sound source types, time zones, and frequency bands, such as wind or river flow, bird voices, etc., that occur naturally in the natural world.

An example of audio content will be described in more detail using FIG. 3. As described above, the storage unit 21c may store a plurality of audio contents for each season and each time zone. FIG. 3 is a diagram showing examples of additional sounds inserted into audio content for each season and each time of day. As shown in FIG. 3, the types of creatures used for additional sounds are changed for each season and each time of day. In this case, the background sound played in the audio content is, for example, the sound of trees swaying in the wind, the sound of water flowing in a river or the sea, or the like. A plurality of audio contents generated by adding additional sounds shown in FIG. 3 to those background sounds are stored in the storage unit 21c.

Therefore, in this case, at least (4 seasons) x (4 time zones) = 16 audio contents are created and stored in the storage unit 21c. The sound field control unit 21a acquires date and time data indicating the current date and time from the timer unit 21e, selects audio content corresponding to the actual season and living time zone based on the date and time data, and selects the audio content to be played. Switch. Furthermore, even when the audio content is music, at least (4 seasons) x (4 time zones) = 16 pieces of music may be stored in the storage unit 21c. In that case as well, the sound field control unit 21a acquires date and time data indicating the current date and time from the timer unit 21e, selects audio content of music corresponding to the actual season and time zone, and selects the audio content to be played. You can switch content.

In the first embodiment, as described above, a plurality of audio contents may be prepared for each season and each time of day, and the audio contents may be switched according to the actual season and time of day. In that case, the user will not feel sluggish and will be able to auditorily feel the change of seasons and changes in the time of day, etc. ” and “relaxation”. Furthermore, for some users, recognizing the change in audio content may give them a sense of excitement, and they may find riding in car 5 of the elevator 1 a pleasure. In this way, by switching the audio content, it is possible to further reduce stress on the user.

Here, the hardware configuration of the car control device 9 will be explained. Each function of the input section 9a, control section 9b, and 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. The dedicated hardware is, for example, an ASIC (Application Specific Integrated Circuit) or an FPGA (Field Programmable Gate Array). A processor executes programs stored in memory. The storage unit 9d is composed of a memory. Memory can be nonvolatile or volatile semiconductor memory such as RAM (Random Access Memory), ROM (Read Only Memory), flash memory, or EPROM (Erasable Programmable ROM), or disks such as magnetic disks, flexible disks, or optical disks. be.

Also, the hardware configuration of the audio content generation device 40 will be explained. Each function of the output section 40a, signal processing section 40b, and input section 40d in the audio content generation device 40 is realized by a processing circuit. The processing circuitry consists of dedicated hardware or a processor. The dedicated hardware and processor may be the same as those described above, so their explanation will be omitted. The storage unit 40c is composed of a memory. The memory may be the same as above, so its explanation will be omitted.

Also, the hardware configuration of the sound field control device 21 will be explained. Each function of the sound field control section 21a, output section 21b, and timer section 21e in the sound field control device 21 is realized by a processing circuit. The processing circuitry consists of dedicated hardware or a processor. The dedicated hardware and processor may be the same as those described above, so their explanation will be omitted. The storage unit 21c is composed of a memory. The memory may be the same as above, so its explanation will be omitted.

The detection section 21d of the sound field control device 21 is composed of a sensor. The sensors include the following:
- Acceleration sensor that can detect acceleration in one or more directions.
・Speed sensor that can detect speed.
・Atmospheric pressure sensor that can detect atmospheric pressure changes.
Note that the constituent materials of these sensors are not particularly limited, and any one of an electronic type, a piezoelectric type, a pyroelectric type, etc. may be used as the sensing method.

The detection unit 21d detects a physical quantity indicating the running state of the car 5 of the elevator 1. The physical quantity includes the acceleration or speed of the car 5 in the running direction, the vibration of the car 5, or the change in air pressure that the car 5 undergoes when the car 5 moves up or down. In the first embodiment, a case will be described in which the detection unit 21d is configured from an acceleration sensor. The sound field control unit 21a can determine the running state of the car 5 of the elevator 1 based on the physical quantity detected by the detection unit 21d. Note that the running state also includes a stopped state in which the car 5 is stopped.

FIG. 4 is a front view showing the configuration of the acoustic system 13 according to the first embodiment. FIG. 5 is a top view showing the arrangement of the speaker cabinet 20 of the audio system 13 according to the first embodiment. 4 and 5, the height direction of the car 5 is the Y direction, the width direction of the car 5 is the X direction, and the depth direction of the car 5 is the Z direction. The Y direction is, for example, a vertical direction. Further, as shown in FIG. 5, when defining left and right and front and back inside the car 5, the X direction is the left and right direction of the car 5, and the Z direction is the front and rear direction of the car 5.

As shown in FIG. 4, the acoustic system 13 includes a speaker system 22 arranged on the ceiling of the space inside the car 5 and a sound field control device 21. As shown in FIG. 4, each speaker cabinet 20 is installed, for example, in the interior space of the suspended ceiling 10. Speaker system 22 includes one or more speaker cabinets 20. Further, each speaker cabinet 20 is equipped with one or more speaker units 23. The acoustic system 13 forms a sound field 27 and radiates sound to the user of the car 5. In the first embodiment, the speaker system 22 performs monaural reproduction or stereo reproduction and generates a sound field environment within the space inside the car 5. Thereby, it is possible to give a "comfortable feeling" to the auditory sensibilities of the users in the interior space of the car 5. As a result, discomfort factors such as stress when staying in a narrow space can be reduced.

Note that when performing monaural reproduction, it is desirable to use two or more speaker units 23 so that a three-dimensional sound field environment can be generated. When a monaural signal is reproduced by two or more speaker units 23, at least one of the following two signal processes is performed on the audio signal of at least one channel.
(1) Apply a frequency filter that performs band processing of ⅓ octave or more to the frequency band of the audio signal, particularly 800 Hz or more.
(2) Perform sound image movement processing to change the phase of all bands or any band of the audio signal between 0 degrees and 180 degrees.
Then, by simultaneously emitting the audio signal that has undergone signal processing and the audio signal that has not undergone signal processing from two or more speaker units 23, a spacious sound field feeling can be provided to the user. Can be done.

Embodiment 1 will be described using an example in which the number of speaker cabinets 20 included in the speaker system 22 is two, as shown in FIGS. 4 and 5. However, the number of speaker cabinets 20 is not limited to this, and may be any number greater than or equal to one. Further, when the number of speaker cabinets 20 is one, the number of speaker units 23 mounted in the speaker cabinet 20 is preferably two or more, but may be one. When the number of speaker cabinets 20 is two or more, or the number of speaker units 23 is two or more, sound radiation can be realized from multiple directions within the space inside the cage 5, and more than two channels can be reproduced. A sound field 27 can be formed.

FIG. 6 is a side view showing an example of the configuration of the speaker cabinet 20 according to the first embodiment. FIG. 7 is a front view showing the configuration of the speaker cabinet 20 of FIG. 6. As shown in FIGS. 6 and 7, the speaker cabinet 20 includes a speaker unit 23 and a housing 25. The speaker unit 23 is housed in a housing 25. The speaker unit 23 is provided on the front surface 25a of the housing 25, and has a radiation surface 23a that radiates sound toward the outside. The housing 25 has, for example, a rectangular parallelepiped shape. The casing 25 is a sealed device with a hollow interior. The radiation surface 23a of the speaker unit 23 is fitted into an installation hole provided on the front surface 25a of the housing 25, and is exposed to the outside through the installation hole. All other parts of the speaker unit 23 are installed inside the housing 25. Therefore, the sound from the radiation surface 23a of the speaker unit 23 is radiated only in the direction of arrow A in FIG. 6, and is not radiated to the outside through other parts of the housing 25 other than the radiation surface 23a.

FIG. 8 is a side view showing the configuration of a modified example of the speaker cabinet 20 according to the first embodiment. FIG. 9 is a front view showing the configuration of the speaker cabinet 20 of FIG. 8. As shown in FIGS. 8 and 9, the speaker cabinet 20 may house two or more speaker units 23 in the housing 25. In this case, the two or more speaker units 23 may all be of the same type, or may be of different types. Specifically, for example, one speaker unit 23-1 may be a full-range speaker, and the other speaker unit 23-2 may be a tweeter. A full-range speaker is one that reproduces everything from low to high frequencies. In the embodiment of the present disclosure, when one speaker unit 23 is housed in the housing 25 of the speaker cabinet 20, the speaker unit 23 is a full-range speaker. A tweeter is a low-frequency speaker used as a supplement to a full-range speaker. It is difficult to reproduce the range from low to high frequencies with a single speaker, and it is conceivable that the sound quality may be insufficient. In such cases, tweeters are used to compensate. The two or more speaker units 23 disposed within the housing 25 may be of different types, or may be of the same type. However, it is desirable that one speaker be a full-range speaker and the other speakers be dedicated to low-range or high-range speakers that are used as supplements to the full-range speaker. In that case, it is possible to deal with a wide frequency band from low to high, and to emit sound in each fine frequency band. In this way, when one speaker cabinet 20 has a plurality of speaker units 23, the speaker cabinet 20 alone can improve the sound quality and expand the reproduction band. As a result, a "high quality sound system" that can cover a wide frequency band can be easily obtained.

[Indirect sound emission]
Returning to the explanation of FIGS. 4 and 5. As shown in FIGS. 4 and 5, the speaker cabinet 20 is arranged in the interior space of the suspended ceiling 10. As shown in FIGS. The height of the suspended ceiling 10 in the Y direction (height direction of the car 5) is, for example, about 5 cm. Therefore, as shown in FIG. 4, the height H1 of the housing 25 of the speaker cabinet 20 in the Y direction (height direction of the car 5) is 5 cm or less. In this way, the height H1 of the housing 25 is limited by the height of the suspended ceiling 10 in the Y direction (height direction of the car 5). Further, the radiation surface 23a of the speaker unit 23 is arranged to face the side plate 5a of the car 5, as shown in FIGS. 4 and 5. The radiation surface 23a is arranged along the edge of the side surface 10a of the suspended ceiling 10. The radiation surface 23a is located in the same plane as the side surface 10a of the suspended ceiling 10, as shown in FIG. Therefore, the position of the radiation surface 23a in the X direction (width direction of the car 5) matches or almost matches the position of the side surface 10a of the suspended ceiling 10 in the X direction. An opening is provided in the side surface 10a of the suspended ceiling 10 in accordance with the position of the radiation surface 23a. Note that the entire side surface 10a of the suspended ceiling 10 may be in an open state. Therefore, the sound radiated from the radiation surface 23a is not blocked by the side surface 10a of the suspended ceiling 10. Further, as described above, there is a gap 11 having a first distance D between the side surface 10a of the suspended ceiling 10 and the side plate 5a of the car 5. The first distance D is approximately 5 cm. Note that the first distance D varies depending on the model of the elevator 1, but is appropriately set in the range of 2 cm to 20 cm, preferably in the range of 3 cm to 10 cm. As shown in FIGS. 4 and 5, the sound radiated from the radiation surface 23a of the speaker unit 23 is radiated in the direction of arrow A. Thereafter, the sound is reflected by the side plate 5a of the car 5 and becomes a reflected sound. The reflected sound travels in the direction of arrow B, as shown in FIGS. 4 and 5. In this way, in the first embodiment, the speaker unit 23 performs "indirect sound radiation" which uses the reflection of the side plate 5a of the car 5 to radiate sound to the user.

In the first embodiment, the radiation surface 23a of the speaker unit 23 is arranged close to the side plate 5a of the car 5 so as to face the side plate 5a of the car 5 via the gap 11 having the first distance D. There is. As described above, the first distance D is, for example, about 5 cm. Therefore, the sound emitted from the radiation surface 23a of the speaker unit 23 is reflected by the side plate 5a of the car 5 immediately after the sound is emitted, before the sound pressure level decreases.

Further, as shown in FIG. 5, the speaker cabinet 20 is arranged on the rear side of the center of the suspended ceiling 10 in the Z direction (the depth direction of the car 5). Note that the position of the speaker cabinet 20 in the Z direction is not limited to this, and it may be installed at the center of the suspended ceiling 10 in the Z direction, or it may be installed in front of the center of the suspended ceiling 10 in the Z direction. may be done. Further, as shown in FIG. 4, the speaker cabinet 20 is arranged at the center of the suspended ceiling 10 in the Y direction (height direction of the car 5). Note that the position of the speaker cabinet 20 in the Y direction is not limited to this, and may be above or below the center portion of the suspended ceiling 10 in the Y direction.

The speaker unit 23 provided in one of the two speaker cabinets 20 shown in FIG. 5 is referred to as a speaker unit 23R. Further, the speaker unit 23 provided in the speaker cabinet 20 is referred to as a speaker unit 23L. The speaker unit 23R and the speaker unit 23L are arranged apart from each other. Note that the speaker cabinet 20 accommodating the speaker unit 23R and the speaker cabinet 20 accommodating the speaker unit 23L are arranged a certain distance apart from each other with respect to the center of the suspended ceiling 10 in the X direction. There is. This distance is called a second distance D2. The second distance D2 is determined from the dimension of the car 5 in the X direction, the first distance D, and the dimension of the housing 25 in the X direction. The speaker unit 23R and the speaker unit 23L are arranged so that their backs face each other. Therefore, as shown in FIG. 5, the radiation surface 23a of the speaker unit 23R is arranged to face the right side plate 5a of the car 5. On the other hand, the radiation surface 23a of the speaker unit 23L is arranged to face the left side plate 5a of the car 5. Each of the radiation surfaces 23a of the speaker units 23R and 23L is arranged facing the gap 11. Each of the radiation surfaces 23a of the speaker units 23R and 23L is arranged in the same plane as the left and right side surfaces 10a of the suspended ceiling 10.

In the car 5 of the elevator 1, a user generally stands facing toward the car door 5d. Therefore, the sound emitted from the speaker unit 23R mainly reaches the user's right ear, and the sound emitted from the speaker unit 23L mainly reaches the user's left ear. Hereinafter, the sound emitted from the speaker unit 23R will be referred to as the "right side sound", and the sound emitted from the speaker unit 23L will be referred to as the "left side sound".

[Direct sound emission]
The installation orientation of the speaker cabinet 20 is not limited to the cases shown in FIGS. 4 and 5. FIG. 10 is a front view schematically showing the configuration of a modified example of the acoustic system 13 according to the first embodiment.

In FIG. 10, two speaker units 23R-1 and 23L-1 are provided facing the floor plate 5b of the car 5. Therefore, the radiation surfaces 23a of the speaker units 23R-1 and 23L-1 are arranged to face the floor plate 5b of the car 5, as shown in FIG. Note that the speaker cabinet 20 accommodating the speaker unit 23R-1 and the speaker cabinet 20 accommodating the speaker unit 23L-1 are spaced a certain distance apart from each other with respect to the center of the suspended ceiling 10 in the X direction. It is located. This certain distance is called a third distance D3. The third distance D3 may be the same as or different from the second distance D2 shown in FIG.

As shown in FIG. 10, each of the radiation surfaces 23a of the speaker units 23R-1 and 23L-1 is arranged in the same plane as the lower surface 10b of the suspended ceiling 10. Therefore, the position of each radiation surface 23a in the Y direction (height direction of the car 5) matches or almost matches the position of the lower surface 10b of the suspended ceiling 10 in the Y direction. Furthermore, the radiation surface 23a portions of the speaker units 23R-1 and 23L-1 are fitted into mounting holes provided in the lower surface 10b of the suspended ceiling 10. Each of the radiation surfaces 23a of the speaker units 23R-1 and 23L-1 is exposed to the outside through the mounting hole. Therefore, the sound radiated from each of the radiation surfaces 23a of the speaker units 23R-1 and 23L-1 is not blocked by the lower surface 10b of the suspended ceiling 10.

As shown in FIG. 10, the sound radiated from the speaker units 23R-1 and 23L-1 is radiated from the radiation surface 23a in the direction of arrow A. In this way, the speaker units 23R-1 and 23L-1 perform "direct sound emission" in which sound is directly emitted from the suspended ceiling 10 to the user.

[Combination of indirect sound emission and direct sound emission]
Further, FIG. 11 is a plan view schematically showing the configuration of a further modified example of the acoustic system 13 according to the first embodiment. FIG. 11 shows the lower surface 10b of the suspended ceiling 10 viewed from the floorboard 5b side. In FIG. 11, four speaker units 23R-1, 23R-2, 23L-1, and 23L-2 are provided. In FIG. 11, among the four speaker units 23R-1, 23R-2, 23L-1, and 23L-2, two speaker units 23R-2 and 23L-2 face the front side plate 5a of the car 5. It is provided. Further, two other speaker units 23R-1 and 23L-1 are provided facing the floor plate 5b of the car 5. Therefore, the radiation surfaces 23a of the speaker units 23R-1 and 23L-1 are arranged to face the floor plate 5b of the car 5, as shown in FIG.

This will be explained in more detail. As shown in FIG. 11, two front speaker units 23R-2 and 23L-2 are provided facing the front side plate 5a of the car 5. The speaker cabinet 20 accommodating the speaker unit 23R-2 and the speaker cabinet 20 accommodating the speaker unit 23L-2 are placed a certain distance apart from each other with respect to the center of the suspended ceiling 10 in the X direction. has been done. The certain distance may be the same as or different from the third distance D3 shown in FIG. 10, for example.

Therefore, each of the radiation surfaces 23a of the speaker units 23R-2 and 23L-2 is arranged to face the side plate 5a of the car 5. Furthermore, each of the radiation surfaces 23a is arranged along the side of the side surface 10a of the suspended ceiling 10. Therefore, the position of each radiation surface 23a in the Z direction (the depth direction of the car 5) matches or almost matches the position of the side surface 10a of the suspended ceiling 10 in the Z direction.

As described above, there is a gap 11 having a first distance D between the side surface 10a of the suspended ceiling 10 and the side plate 5a of the car 5. As shown in FIG. 11, the sound radiated from the speaker units 23R-2 and 23L-2 is radiated from the radiation surface 23a in the direction of arrow A. Thereafter, the sound is reflected by the side plate 5a of the car 5 and becomes a reflected sound. The reflected sound travels in the direction of arrow B, as shown in FIG. In this way, the speaker units 23R-2 and 23L-2 perform "indirect sound radiation" that uses the reflection of the side plate 5a of the car 5 to radiate sound from the suspended ceiling 10 to the user. There is.

On the other hand, the two rear speaker units 23R-1 and 23L-1 are provided facing the floor plate 5b of the car 5, as described above with reference to FIG. Therefore, as described above, the two rear speaker units 23R-1 and 23L-1 perform "direct sound emission" in which sound is directly emitted from the suspended ceiling 10 to the user. ing. In the first embodiment, as in the modified example of FIG. 11, "indirect sound emission" and "direct sound emission" may be mixed. In this case, the speaker units 23R and 23L shown in FIG. 5 may be provided instead of the speaker units 23R-2 and 23L-2 in FIG. 11.

The speaker unit 23 may be installed at any location on the lower surface 10b of the suspended ceiling 10 within the car 5. As an installation pattern, for example, when installing on the right side and left side as shown in FIG. There are cases where the system is installed in the same place, and the combinations in these cases are also free. However, the sound quality will be better if the speaker units 23 are separated from each other to some extent. Therefore, in the first embodiment, the speaker cabinets 20 housing the speaker units 23 are spaced apart from each other by the second distance D2 or the third distance D3.

[Speaker cabinet installation height]
The speaker cabinet 20 may be installed inside the floor plate 5b of the car 5. However, since the user's body itself acts as a sound absorber and reflector, as the number of users increases, it becomes difficult for the acoustic signals radiated from the user's feet to reach the user's ears. As a result, it is not possible to create a sound field 27 within the car 5 based on high-quality sound reproduction. Therefore, in the first embodiment, in order to achieve high quality sound reproduction, the speaker cabinet 20 is basically installed at a position above the user's chest.

[Sound field]
The sound field 27 generated by the acoustic system 13 is, for example, the range shown by the broken line in FIG. Specifically, the height H2 of the lower limit 27a of the sound field 27 is, for example, about 1.0 m to 1.7 m from the floorboard 5b of the car 5, and preferably 1.6 m. Further, the upper limit height of the sound field 27 is, for example, 1.8 m from the floor plate 5b of the car 5. In this way, the sound field 27 is desirably formed in a height range from 1.6 m to 1.8 m from the floorboard 5b. In this way, the sound field 27 is generated in the portion of the car 5 above the lower limit 27a. As a result, a sound field 27 is formed around the user's head, as shown in FIG. Note that the height H2 of the lower limit 27a of the sound field 27 is set based on the average height of users (excluding those under junior high school students). Note that in the range from 0 m to less than 1.6 m in height from the floorboard 5b, as mentioned above, when multiple users are in the car 5, the sound may be blocked or blocked by the user's body. Since it is absorbed, it is not possible to form a good sound field. Furthermore, in a range where the height from the floorboard 5b exceeds 1.8 m, the sound field 27 is formed unevenly above the user's head, making it difficult for the user to hear the sound field.

[Detection section of sound field control device]
Next, the detection section 21d provided in the sound field control device 21 will be explained using FIGS. 12 to 15. FIG. 12 is a front view showing the arrangement position of the detection section 21d. FIG. 13 is a top view showing the arrangement position of the detection section 21d. Note that in FIG. 13, a part of the configuration is shown transparently for explanation. FIG. 14 is a perspective view showing the configuration of the detection section 21d. FIG. 15 is a diagram showing an example of the waveform of the detection result for each direction of the detection unit 21d. In FIG. 15, the horizontal axis represents time, and the vertical axis represents the output level of the detection result of the detection unit 21d.

As described above, the detection unit 21d detects a physical quantity indicating the running state and the stopped state of the car 5, and is composed of, for example, at least one of an acceleration sensor, a speed sensor, or an air pressure sensor. In the first embodiment, a case will be described in which the detection section 21d is composed of an acceleration sensor. The acceleration sensor detects vibrations in one direction or three directions. An acceleration sensor can detect the degree of movement, tilt, vibration, etc. of an object by measuring the acceleration of the object. Acceleration sensors, unlike vibration sensors, can also detect gravity. Acceleration sensors can obtain various information such as movement, tilt, vibration, and impact of an object by measuring acceleration and processing the acceleration as a signal. Acceleration sensors have the concept of "axes"; for example, a three-axis acceleration sensor can obtain information on the X, Y, and Z axes. For example, when the Z-axis is fixed and an object tilts, the outputs that change at that time are the X-axis and Y-axis outputs. The acceleration sensor can also detect the air pressure experienced by the object. The principle by which the acceleration sensor detects atmospheric pressure will be described later. In Embodiment 1, a case will be described in which the acceleration sensor measures the acceleration that changes as the car 5 travels, and detects vibrations of the car 5 and changes in air pressure experienced by the car 5 based on the acceleration. .

As shown in FIG. 12, the detection unit 21d is mounted on the car 5 and detects vibrations and changes in air pressure in the running direction of the car 5. The detection unit 21d is mounted on the top surface of the ceiling plate 5c of the car 5, for example. In this case, the detection unit 21d is installed on the outer surface of the car 5. The detection unit 21d may be installed inside the casing 210 of the sound field control device 21 shown in FIG. 4, or may be installed outside the casing 210 of the sound field control device 21. Further, as shown in FIG. 13, the detection unit 21d is preferably installed at the center of the ceiling plate 5c of the car 5 in plan view in order to reduce detection errors. Furthermore, the detection unit 21d can be installed at locations other than those shown in FIGS. 12 and 13. For example, as shown by the broken line 21dA in FIG. 12, it may be buried in the floorboard 5b of the car 5. Alternatively, as shown by the broken line 21 dB in FIG. 12, it may be installed within the car operation panel 5f of the car 5. Alternatively, as shown by the broken line 21dC in FIG. 12, it may be installed in the internal space of the suspended ceiling 10 of the car 5. In these cases, the detection unit 21d is installed inside the car 5. In this way, the detection unit 21d is installed on the outside or inside of the car 5. Further, the detection unit 21d is installed in a location that cannot be discovered by the user and cannot be touched by the user, such as near the ceiling plate 5c of the elevator 1, inside the floorboard 5b, or inside the car operation panel 5f. This can prevent the user from playing tricks on the detection unit 21d.

As shown in FIG. 14, the detection unit 21d includes a substrate 212 and a sensor element 211 fixed to the substrate 212. The sensor element 211 is capable of detecting acceleration in three directions: the X direction, the Y direction, and the Z direction shown in FIG. The sensor element 211 is composed of, for example, a MEMS (Micro Electro Mechanical Systems) sensor element. MEMS sensor elements are extremely small acceleration sensors that are also used in smartphones, game consoles, and the like. The sensing method of the sensor element 211 may be any method such as electronic, piezoelectric, or pyroelectric.

The sensor element 211 detects vibrations in three directions: the X direction, the Y direction, and the Z direction. As shown in the graph of FIG. 15, the sensor element 211 outputs acceleration signals for each direction in response to vibrations in the X direction, Y direction, and Z direction. At this time, as shown in FIG. 12, the detection section 21d is installed so that the top surface of the board 212 and the top surface of the ceiling plate 5c of the car 5 are parallel to each other. In this case, the running direction of the car 5 and the Y direction of the detection unit 21d match. Therefore, as shown in FIG. 15, there is a noticeable change in the waveform of the acceleration signal in the Y direction. However, almost no change is observed in the waveforms of the acceleration signals in the X direction and the Z direction. In Embodiment 1, an example is given in which the sound field control unit 21a determines the running state and the stopped state of the car 5 using the detection result in the Y direction of the detection unit 21d in which a noticeable change in the waveform appears. explain.

Note that an amplifier may be installed between the detection section 21d and the sound field control section 21a, if necessary. If the output level of the acceleration signal output from the detection section 21d is too small, the output level of the acceleration signal is increased by the amplifier so that it becomes an output level that can be easily processed by the sound field control section 21a. Conversely, if the output level of the acceleration signal output from the detection section 21d is too large, the output level of the acceleration signal is reduced by the amplifier so that it becomes an output level that can be easily processed by the sound field control section 21a.

The detection unit 21d is configured such that the substrate 212 can be installed in any direction. Therefore, the direction in which the waveform of the acceleration signal changes varies depending on the direction in which the substrate 212 is installed. That is, as described above, if the traveling direction of the car 5 and the Y direction of the detection unit 21d match, a remarkable change is seen in the waveform of the acceleration signal in the Y direction. On the other hand, if the running direction of the car 5 and the X direction of the detection unit 21d match, a remarkable change is seen in the waveform of the acceleration signal in the X direction. Similarly, if the running direction of the car 5 and the Z direction of the detection unit 21d match, a noticeable change is seen in the waveform of the acceleration signal in the Z direction. Therefore, the sound field control unit 21a may determine the running state and the stopped state of the car 5 by using the detection results of the direction in which a significant change is seen in the waveform of the acceleration signal among the detection results of the detection unit 21d. .

The car 5 is suspended by a main rope 4, as shown in FIG. Therefore, if a user intentionally makes noise inside the car 5, it is assumed that vibrations will occur transiently. Therefore, as shown in FIG. 15, a threshold value is set in advance for the output level of the detection section 21d. Hereinafter, this threshold will be referred to as a first threshold Th1. The sound field control unit 21a excludes detection results exceeding the first threshold Th1 from the time-series detection results of the detection unit 21d as abnormal values. Then, the sound field control unit 21a determines the running state and stopped state of the car 5 using the detection results after excluding abnormal values. Thereby, it is possible to prevent the sound field control unit 21a from making a wrong determination when determining the running state and the stopped state of the car 5.

In addition, in FIG. 15, the first threshold Th1 is provided only for the acceleration signal in the Y direction to simplify the diagram, but in reality, the first threshold Th1 is provided also for the acceleration signal in the X direction and the Z direction. It is desirable to provide the first threshold Th1 in advance.

In the above description, the sensor element 211 detects vibrations in three directions as an example, but the sensor element 211 detects vibrations in one direction, that is, only in the running direction of the car 5. It can be anything.

Next, the operation of the detection unit 21d as the car 5 runs and stops will be explained using FIGS. 16 to 18. FIG. 16 is a diagram showing the waveform of the output of the detection section 21d used by the sound field control section 21a for determination. FIG. 16 shows the waveform of the detection result in the Y direction while the car 5 is in operation. Further, FIG. 17 is a diagram showing the relationship between the output of the detection section 21d and the running speed of the car 5. More specifically, FIG. 17(a) is an enlarged view showing the P part of FIG. 16, and FIG. 17(b) shows the running speed of the car 5 of the elevator 1 corresponding to FIG. 17(a). This is a graph showing. However, the waveform in FIG. 17(a) is obtained by performing smoothing processing on the waveform in FIG. 16 so that the waveform becomes smooth. The smoothing process is, for example, time averaging process. FIG. 18 is a diagram showing a state change of the vibrating membrane 211a provided on the sensor element 211 of the detection unit 21d when the car 5 is raised.

Before explaining FIGS. 16 and 17, the operation of the vibrating membrane 211a provided in the sensor element 211 will be explained using FIG. 18. FIG. 18 shows the state of the vibrating membrane 211a when the car 5 is raised. When the sensor element 211 of the detection section 21d is composed of a piezoelectric element, as shown in FIG. 18, the sensor element 211 has a vibrating membrane 211a, a support section 211b, and an exterior case 211c. The support portion 211b has a rectangular frame shape, with a circular cavity in the center. The outer periphery of the rectangular frame of the support portion 211b is fixed to the outer case 211c. A circular vibrating membrane 211a is stretched over the central portion of the support portion 211b. The support portion 211b supports the outer periphery of the vibrating membrane 211a. The vibrating membrane 211a deforms due to the vibration of the car 5 and changes in the air pressure that the car 5 receives. As shown in FIG. 18(a), when the car 5 is stopped, no air pressure is applied to the vibrating membrane 211a, so the vibrating membrane 211a is in a flat state. On the other hand, when the car 5 starts to rise and performs accelerated travel, the speed of the car 5 increases as shown between times t1 and t2 in FIG. 17(b). At this time, as shown in FIG. 18(b), upward air pressure is applied to the vibrating membrane 211a as the car 5 rises. As a result, the vibrating membrane 211a is deformed into an upwardly protruding arc shape. A voltage is generated along with the deformation of the vibrating membrane 211a. Here, this voltage is assumed to be a voltage in the + direction.

Thereafter, the car 5 stops running at an accelerated speed and starts running at a constant speed as shown between times t2 and t3 in FIG. 17(b). In the following, traveling at a constant speed will be referred to as constant speed traveling. When the car 5 runs at a constant speed, the air pressure applied to the vibrating membrane 211a is stabilized, and the vibrations of the car 5 are reduced. Therefore, as shown in FIG. 18(c), the change in the vibrating membrane 211a is reduced, and the vibrating membrane 211a returns to a substantially flat state. Thereafter, when the car 5 approaches the parking floor, the car 5 decelerates in preparation for stopping, as shown between times t3 and t4 in FIG. 17(b). At this time, as shown in FIG. 18(d), due to the sudden speed change of the car 5, the air pressure applied to the vibrating membrane 211a becomes a "negative pressure" state, contrary to the case during accelerated running in FIG. 18(b). , downward atmospheric pressure is applied. As a result, the vibrating membrane 211a is deformed into a downwardly protruding arc shape, as shown in FIG. 18(d). A voltage is generated along with the deformation of the vibrating membrane 211a. Here, this voltage is assumed to be a negative voltage (back electromotive force).

In this way, the detection unit 21d outputs a voltage in the + direction or a voltage in the - direction as the vibrating membrane 211a deforms as the car 5 runs or stops. The voltage is a physical quantity that indicates the running state and stopped state of the car 5, and indicates the vibration of the car 5 and the change in atmospheric pressure that the car 5 has undergone. In this way, when the detection unit 21d is an acceleration sensor, the detection unit 21d detects the vibration of the car 5 and the change in atmospheric pressure that the car 5 receives.

Next, the running state and stopped state of the car 5 will be explained using FIGS. 16 and 17. First, in FIG. 16, the horizontal axis shows time, and the vertical axis shows the voltage in the + direction and the voltage in the - direction output by the detection section 21d. In FIG. 16, the car 5 is in the following state in each time segment (1) to (7).
(1): Car 5 is stopped.
(2): Car 5 is running upward. That is, the car 5 is moving up within the hoistway 2.
(3): Car 5 is stopped.
(4): Car 5 is running downward. That is, the car 5 is descending within the hoistway 2.
(5): Car 5 is stopped.
(6): Car 5 is running upward. That is, the car 5 is moving up within the hoistway 2.
(7): Car 5 is stopped.

FIG. 17(a) shows the P portion of FIG. 16. That is, FIG. 17(a) shows time segment (6) in FIG. 16. In FIG. 17(a), the horizontal axis shows time, and the vertical axis shows the voltage in the + direction and the voltage in the - direction output by the detection section 21d. As shown in FIG. 17(a), the time segment (6) in FIG. 16 is further subdivided into the following time segments (U1) to (U5). In each time segment (U1) to (U5) in FIG. 17(a), the acceleration and jerk of the car 5 are in the following state. Note that jerk is the rate of change of acceleration over time.
(U1): Acceleration>0, jerk>0
(U2): Acceleration > 0, jerk < 0
(U3): Acceleration is 0 or almost 0, jerk is 0
(U4): Acceleration < 0, jerk < 0
(U5): Acceleration < 0, jerk > 0

That is, in time segments (U1) and (U2), the car 5 is in an accelerated traveling state, and the detection unit 21d outputs a voltage in the + direction as shown in FIG. In the time segment (U3), the car 5 is running at a constant speed, and the voltage value output by the detection unit 21d is 0 or almost 0. In time segments (U4) and (U5), the car 5 is in a state of deceleration running, and the detection unit 21d outputs a voltage in the negative direction.

The sound field control section 21a determines the running state of the car 5 based on the output of the detection section 21d. Specifically, the sound field control unit 21a determines that the car 5 is in the acceleration state when the detection unit 21d is outputting a voltage in the + direction while the car 5 is rising. Further, the sound field control unit 21a determines that the car 5 is in a constant speed state when the voltage value output by the detection unit 21d becomes 0 or almost 0 after the positive voltage state. . Further, the sound field control unit 21a determines that the car 5 is in a deceleration state when the detection unit 21d is outputting a voltage in the − direction while the car 5 is rising. Further, the sound field control unit 21a determines that the car 5 is in a stopped state when the voltage value output by the detection unit 21d becomes 0 or almost 0 after being in a voltage state in the − direction. .

Next, a series of operations when the car 5 is raised will be described using FIGS. 18 to 20. FIG. 19 is a diagram showing the waveform of the output voltage when the acceleration of the elevator car 5 is detected by the detector 21d. In FIG. 19, the horizontal axis shows time, and the vertical axis shows the output voltage of the detection section 21d. FIG. 20 is a diagram showing changes in the sound pressure level of the audio content when the car 5 rises. More specifically, FIG. 20(a) shows changes in the sound pressure level of the audio content when the car 5 rises, with the horizontal axis showing time and the vertical axis showing the sound pressure level of the audio content. Further, FIG. 20(b) has the same content as FIG. 19.

As described above, when the sensor element 211 of the detection unit 21d is composed of a piezoelectric element, the vibrating membrane 211a changes in an arc shape due to piezoelectric change, and depending on the amount of change in the arc (that is, the amount of amplitude), The output voltage of the sensor element 211 fluctuates. Accordingly, the voltage output from the detection section 21d increases or decreases. In this way, the detection unit 21d detects the vibration of the car 5 and the change in atmospheric pressure based on the change in the vibrating membrane 211a, and outputs a voltage in the + direction or a voltage in the - direction as a detection signal.

In FIGS. 19 and 20, the car 5 is stopped in the time segment (ST1). At this time, the vibrating membrane 211a of the sensor element 211 of the detection section 21d is in a flat state, as shown in FIG. 18(a).

In FIG. 19, in the time segment (U1), the acceleration of the car 5 gradually increases in proportion to the hoisting speed of the hoisting machine 3 shown in FIG. 1, and the vibration membrane 211a increases as shown in FIG. It gradually protrudes upward. Along with this deformation of the vibrating membrane 211a, the value of the output voltage of the detection section 21d also gradually increases. Therefore, the time segment (U1) is the "rise time in the positive voltage direction" of the output voltage of the detection unit 21d.

In FIG. 19, in time segment (U2), the acceleration of the car 5 gradually decreases in proportion to the hoisting speed of the hoist 3 shown in FIG. 1, and the amount of protrusion of the vibrating membrane 211a also gradually decreases. go. Along with this deformation of the vibrating membrane 211a, the value of the output voltage of the detection section 21d also gradually decreases. Therefore, the time segment (U2) is the "fall time in the positive voltage direction" of the output voltage of the detection unit 21d.

In FIGS. 19 and 20, the total time length of time segments (U1) and (U2) is about 5 seconds. Using this time, the sound field control unit 21a of the sound field control device 21 gradually increases the sound pressure level of the sound content radiated into the car 5, as shown in FIG. 20(a).

In FIGS. 19 and 20, in the time segment (U3), the car 5 is running at a constant speed, and the acceleration of the car 5 is 0 or almost 0. Accordingly, as shown in FIG. 18(c), the vibrating membrane 211a is in a substantially flat state. At this time, the output voltage of the detection section 21d is 0 or almost 0.

The time length of the time segment (U3) is an arbitrary time length depending on the number of floors of the building in which the elevator 1 is installed. The sound field control unit 21a of the sound field control device 21 adjusts the sound pressure level of the sound content radiated into the car 5 to be constant in the time segment (U3), as shown in FIG. 20(a). do. A method of setting the sound pressure level in the time segment (U3) will be described below.

The car 5 of the elevator 1 is installed in the hoistway 2, as described using FIG. Since the hoistway forming body forming the periphery of the hoistway 2 is made of a metal plate, the inside of the hoistway 2 is acoustically isolated from the outside. Therefore, outdoor noise is less likely to enter the car 5. On the other hand, the hoistway forming body has a car rail portion (not shown) that guides the elevator car 5 to ascend and descend. The car rail portion extends in the height direction of the hoistway 2. On the other hand, a car guide shoe is provided on the outer surface of the side plate 5a of the car 5. The car guide shoe and the car rail portion are capable of engaging with each other. Therefore, the elevator car 5 is guided up and down by the car guide shoe sliding against the car rail section. Therefore, while the car 5 is running, the sounds propagated into the car 5 include the "sliding noise" between the car guide shoes and the car rail section, and the "sliding noise" between the sheave 3a and the main rope 4 shown in FIG. It becomes a "sliding sound". The volume of these "sliding sounds" changes depending on the installation environment of the car 5. Therefore, after the car 5 is actually installed, the car 5 is run on a trial basis, and the volume of the "sliding sound" is measured using a volume meter. Then, it is desirable to determine the sound pressure level of the audio content in the time segment (U3) based on the measured volume of the "sliding sound." Specifically, the sound pressure level of the audio content in the time segment (U3) is set to a value greater than the volume of the measured "sliding sound." The sound pressure level may be determined automatically by the sound field control unit 21a of the sound field control device 21 by providing a volume measuring device in the sound field control device 21. Alternatively, the installation worker of the elevator 1 may bring a sound volume measuring device and set the sound pressure level to the sound field control section 21a. In the first embodiment, the sound pressure level of the audio content determined for the time segment (U3) is the maximum value Max (first sound pressure level) of the audio content sound pressure level.

The operations of time segments (U1) to (U3) are summarized below. First, as shown in FIG. 20(a), the sound field control unit 21a of the sound field control device 21 controls the sound pressure level of the sound content radiated into the car 5 over time segments (U1) and (U2). Performs a "fade-in" process that gradually increases the size of the image. Thereafter, the sound field control unit 21a stops the "fade-in" process when the sound pressure level reaches the maximum value Max. Then, in the time segment (U3), the sound field control unit 21a of the sound field control device 21 radiates the audio content into the car while maintaining the sound pressure level of the maximum value Max.

In FIG. 19, in time segment (U4), car 5 approaches the parking floor, and car 5 decelerates. That is, when the car 5 approaches the parking floor, the rotation of the hoisting machine 3 shown in FIG. 1 is controlled, the brake operation is activated, and the car 5 changes to the stopped state with a relatively strong force. Due to the change in air pressure caused by sudden braking at this time, the vibrating membrane 211a gradually protrudes downward as shown in FIG. 18(d). Along with this deformation of the vibrating membrane 211a, the value of the output voltage of the detection section 21d also gradually decreases. Therefore, the time segment (U4) is the "rise time in the negative voltage direction" of the output voltage of the detection unit 21d.

In FIG. 19, in the time segment (U5), the acceleration of the car 5 gradually increases in proportion to the hoisting speed of the hoisting machine 3 shown in FIG. 1, and the amount of protrusion of the vibrating membrane 211a also gradually decreases. go. With this deformation of the vibrating membrane 211a, the value of the output voltage of the detection section 21d gradually increases and approaches zero. Therefore, the time segment (U5) is the "fall time in the negative voltage direction" of the output voltage of the detection unit 21d.

In FIGS. 19 and 20, the total time length of time segments (U4) and (U5) is about 5 seconds. Utilizing this time, the sound field control section 21a of the sound field control device 21 gradually reduces the sound pressure level of the sound content radiated into the car 5.

In FIGS. 19 and 20, the car 5 is stopped in the time segment (ST2). At this time, the vibrating membrane 211a of the sensor element 211 of the detection section 21d has returned to its flat state, as shown in FIG. 18(a).

The operations of time segments (U4) to (U5) and time segment (ST2) will be summarized below. First, the sound field control unit 21a of the sound field control device 21 controls the sound pressure level of the sound content radiated into the car 5 over time segments (U4) and (U5), as shown in FIG. 20(a). ``Fade out'' processing is performed to gradually reduce the size of the image. The sound field control unit 21a of the sound field control device 21 stops the "fade out" process when the sound pressure level reaches the minimum value Min (second sound pressure level). After that, in the time segment (ST2), the sound field control unit 21a of the sound field control device 21 radiates the audio content into the car while maintaining the sound pressure level of the minimum value Min.

In this way, the sound field control unit 21a of the sound field control device 21 allows the user to fully listen to the voice announcements flowing inside the car 5 without completely attenuating the sound pressure level of the audio content even when the car 5 is stopped. Perform processing to lower the volume to an audible level. Therefore, the minimum value Min of the sound pressure level is determined in advance based on the volume of the voice announcement flowing inside the car 5 so that the user can sufficiently hear the voice announcement. Similar to the maximum value Max, the minimum value Min of the sound pressure level may be determined after actually installing the car 5 in consideration of the installation environment of the car 5, but it may be determined at the manufacturing stage of the sound field control device 21. Alternatively, it may be performed at the shipping stage. Note that the audio announcement here is one that is output from the emergency speaker 5g shown in FIG. 2. The audio announcement is made when the car door 5d (see Figures 1 and 2) of the car 5 opens and closes, when the car 5 arrives at the stopping floor, and when the earthquake sensor (not shown) installed in the elevator 1 detects an earthquake. When something is detected, it notifies the user of what will happen next. The voice announcement may be a voice message, or it may be an electronic sound such as "ping pong". Examples of voice messages include "Fifth floor. The door will open.", "I'm coming upstairs. The door will close." and "There's an earthquake. Please come down."

Here, the reason for setting the minimum value Min will be explained. One or more users are riding in the elevator 1, and the time spent in the car 5 differs depending on the user. On the other hand, as the car 5 runs and stops, "fade-in" and "fade-out" processing are performed alternately on the sound pressure level of the audio content, so the sound pressure level of the audio content is constantly raised and lowered. ing. Therefore, if the sound pressure level of the audio content while the car 5 is stopped is set to 0, a user who stays for a long time will temporarily not be able to hear the audio content every time the car 5 stops on an intermediate floor. As a result, the user repeatedly "cannot hear" and "can hear" the audio content. If the auditory exposure time and exposure amount change irregularly in this way, the fluctuations in the sound of the audio content may even become "uncomfortable" for the user. Therefore, in the first embodiment, the minimum value Min of the sound pressure level of the audio content is set. In this way, even when the car 5 is stopped, by ensuring that the audio content has a certain level of volume, it is possible to make it difficult for the user to experience "discomfort".

As described above, in the first embodiment, the maximum value Max (first sound pressure level) of the sound pressure level of the audio content is set to a value larger than the above-mentioned "sliding sound" generated while the car 5 is running. do. Furthermore, it is desirable to set the maximum value Max (first sound pressure level) of the sound pressure level of the audio content to be equal to or higher than the sound pressure level of the audio announcement played in the car 5, for example. Further, the minimum value Min (second sound pressure level) of the sound pressure level of the audio content is set to a value smaller than the sound pressure level of the audio announcement flowing inside the car 5. However, the minimum value Min (second sound pressure level) is set to a value greater than zero.

Note that in a state where there are no users, there is no need to reproduce the audio content, so in this case, the sound pressure level of the audio content may be set to 0. The opening/closing time T1 of the car 5 is set in advance. The opening/closing time T1 is, for example, the time required for a series of operations such as stopping the car 5 at a parking floor → opening the door → closing the door → starting the car 5 running. The opening/closing time T1 varies depending on the model of the elevator 1, but is typically 4 to 5 seconds. As a supplementary note, when the car 5 is provided with a car operation panel for the disabled and the car operation panel is operated, the opening/closing time T1 is changed to 14 seconds to 15 seconds. In this way, the opening/closing time T1 is set in advance. The sound field control unit 21a of the sound field control device 21 counts the elapsed time in which the output voltage of the detection unit 21d is 0, and when the elapsed time exceeds the opening/closing time T1, the sound field control unit 21a determines whether there is a user in the car 5. It is determined that there is no one there. In that case, the sound field control unit 21a of the sound field control device 21 either sets the sound pressure level of the audio content to 0 or stops playing the audio content. Hereinafter, the opening/closing time T1 will be referred to as an unoccupied determination threshold for determining whether or not the inside of the car 5 is unoccupied. Note that the above-mentioned opening/closing time T1 is only an example, and is not limited thereto. Further, the unattended determination threshold may be determined based on the opening/closing time T1, but in consideration of convenience, it may be set to 1 minute, 3 minutes, or 5 minutes, for example, from 4 seconds to 10 minutes. It may be determined as appropriate within the range of .

Next, a series of operations when the car 5 is lowered will be explained using FIGS. 21 to 23. The waveform of the output voltage of the detection unit 21d when the car 5 is lowered is in a waveform state opposite to the waveform when the car 5 is raised.

Before explaining FIGS. 22 and 23, the operation of the vibrating membrane 211a of the sensor element 211 will be explained using FIG. 21. FIG. 21 is a diagram showing the state of the vibrating membrane 211a when the car 5 is lowered. When the sensor element 211 of the detection unit 21d is composed of a piezoelectric element, as shown in FIG. 21(a), when the car 5 is stopped, no air pressure is applied to the vibrating membrane 211a, so the vibrating membrane 211a is in a flat state. On the other hand, when the car 5 starts descending and accelerates, as shown in FIG. 21(b), downward air pressure is applied to the vibrating membrane 211a as the car 5 descends. As a result, the vibrating membrane 211a is deformed into a downwardly protruding arc shape. A voltage is generated along with the deformation of the vibrating membrane 211a. Here, this voltage is assumed to be a voltage in the - direction. In this way, since the voltage in the negative direction is output from the detecting section 21d, the acceleration traveling when the car 5 descends can be said to be acceleration traveling in the negative direction.

Thereafter, car 5 stops accelerating and enters a constant speed running state. When the car 5 runs at a constant speed, the air pressure applied to the vibrating membrane 211a is stabilized, and the vibrations of the car 5 are reduced. Therefore, as shown in FIG. 21(c), the change in the vibrating membrane 211a is reduced, and the vibrating membrane 211a returns to a substantially flat state. Thereafter, when the car 5 approaches the parking floor, the car 5 starts decelerating. At this time, as shown in FIG. 21(d), due to a sudden change in speed as the car 5 prepares to stop, the air pressure applied to the vibrating membrane 211a becomes "positive pressure", contrary to the acceleration shown in FIG. 21(b). ” state, and upward atmospheric pressure is applied. As a result, the vibrating membrane 211a is deformed into an upwardly protruding arc shape, as shown in FIG. 21(d). A voltage is generated along with the deformation of the vibrating membrane 211a. Here, this voltage is assumed to be a voltage in the + direction. The deceleration traveling when the car 5 descends is deceleration traveling in the negative direction.

FIG. 22 is a diagram showing the relationship between the output voltage of the detection unit 21d and the traveling speed of the car 5 when the car 5 is lowered. In FIG. 22(a), the horizontal axis shows time, and the vertical axis shows the output voltage of the detection section 21d. In FIG. 22(b), the horizontal axis shows time, and the vertical axis shows the running speed of the car 5. FIG. 23 is a diagram showing the relationship between the change in the sound pressure level of the audio content when the car 5 is lowered and the output voltage of the detection unit 21d. In FIG. 23(a), the horizontal axis represents time, and the vertical axis represents the sound pressure level of the audio content. Further, FIG. 23(b) has the same content as FIG. 22(a).

As described above, when the sensor element 211 of the detection unit 21d is composed of a piezoelectric element, the vibrating membrane 211a changes in an arc shape due to piezoelectric change, and depending on the amount of change in the arc (that is, the amount of amplitude), The output voltage of the sensor element 211 fluctuates. As a result, the voltage output from the detection section 21d increases or decreases. The vibrating membrane 211a changes in an arcuate shape in response to a pressure change accompanying the movement of the cage 5 outside the main body of the detection unit 21d. The detection unit 21d detects that the car 5 vibrates based on the change in the vibrating membrane 211a, and outputs a voltage in the + direction or a voltage in the - direction as a detection signal.

In FIG. 22, in the time segment (ST3), the car 5 is stopped. At this time, the vibrating membrane 211a of the sensor element 211 of the detection section 21d is in a flat state, as shown in FIG. 21(a).

In FIG. 22, in the time segment (D1), the negative acceleration of the car 5 gradually increases in proportion to the hoisting speed of the hoist 3 shown in FIG. As shown in the figure, it gradually protrudes downward. Along with this deformation of the vibrating membrane 211a, the value of the output voltage of the detection section 21d also gradually decreases. Therefore, the time segment (D1) is the "rise time in the negative voltage direction" of the output voltage of the detection unit 21d.

In FIG. 22, in time segment (D2), the negative acceleration of the car 5 gradually decreases in proportion to the hoisting speed of the hoist 3 shown in FIG. 1, and the amount of protrusion of the vibrating membrane 211a also gradually decreases. I will do it. With this deformation of the vibrating membrane 211a, the value of the output voltage of the detection section 21d gradually increases and approaches zero. Therefore, the time segment (D2) is the "fall time in the negative voltage direction" of the output voltage of the detection unit 21d.

The total time length of time segments (D1) and (D2) in FIG. 22 is about 5 seconds. Utilizing this time, the sound field control section 21a of the sound field control device 21 gradually increases the sound pressure level of the sound content radiated into the car 5.

In FIG. 22, in the time segment (D3), the car 5 is running at a constant speed, and the acceleration of the car 5 is 0 or almost 0. Accordingly, as shown in FIG. 21(c), the vibrating membrane 211a is in a substantially flat state. At this time, the output voltage of the detection section 21d is 0 or almost 0.

As shown in FIG. 23(a), the sound field control unit 21a of the sound field control device 21 gradually adjusts the sound pressure level of the sound content radiated into the car 5 over time segments (D1) and (D2). ``Fade-in'' processing is performed to increase the size of the image. The sound field control unit 21a stops the "fade-in" process when the sound pressure level reaches the maximum value Max. Then, in the time segment (D3), the sound field control unit 21a radiates the audio content into the car 5 while maintaining the sound pressure level of the maximum value Max.

In FIG. 22, in time segment (D4), the car 5 approaches the parking floor and the car 5 decelerates. That is, when the car 5 approaches the parking floor, the rotation of the hoisting machine 3 shown in FIG. 1 is controlled, the brake operation is activated, and the car 5 changes to the stopped state with a relatively strong force. Due to the change in air pressure caused by sudden braking at this time, the vibrating membrane 211a gradually protrudes upward as shown in FIG. 21(d). With this deformation of the vibrating membrane 211a, the value of the output voltage of the detection section 21d gradually increases. Therefore, the time segment (D4) is the "rise time in the positive voltage direction" of the output voltage of the detection unit 21d.

In FIG. 22, in the time segment (D5), the acceleration of the car 5 gradually decreases in proportion to the hoisting speed of the hoist 3 shown in FIG. 1, and the amount of protrusion of the vibrating membrane 211a also gradually decreases. go. With this deformation of the vibrating membrane 211a, the value of the output voltage of the detection section 21d gradually decreases and approaches zero. Therefore, the time segment (D5) is the "fall time in the positive voltage direction" of the output voltage of the detection section 21d.

The total time length of time segments (D4) and (D5) in FIG. 22 is about 5 seconds. Utilizing this time, the sound field control section 21a of the sound field control device 21 gradually reduces the sound pressure level of the sound content radiated into the car 5.

In FIG. 22, the car 5 is stopped in the time segment (ST4). At this time, the vibrating membrane 211a of the sensor element 211 of the detection section 21d has returned to its flat state, as shown in FIG. 21(a).

As shown in FIG. 23(a), the sound field control unit 21a of the sound field control device 21 gradually adjusts the sound pressure level of the sound content radiated into the car 5 over time segments (D4) and (D5). ``Fade out'' processing is performed to reduce the size of the image. The sound field control unit 21a of the sound field control device 21 stops the "fade out" process when the sound pressure level reaches the minimum value Min. After that, in the time segment (ST4), the sound field control unit 21a of the sound field control device 21 radiates the audio content into the car while maintaining the sound pressure level of the minimum value Min.

As explained above, the output of the detection unit 21d when the car 5 is lowered is the opposite of the output when the car 5 is raised. That is, in FIG. 22, during time segments (D1) and (D2), the car 5 is in an accelerated running state when descending, and the detection unit 21d outputs a voltage in the negative direction, as shown in FIG. In the time segment (D3), the car 5 is running at a constant speed while descending, and the voltage value output by the detection unit 21d is 0 or almost 0. In time segments (D4) and (D5), the detection unit 21d outputs a voltage in the + direction when the car 5 is in a decelerated running state when descending.

The sound field control section 21a determines the running state of the car 5 based on the output of the detection section 21d. Specifically, the sound field control unit 21a determines that the car 5 is in an accelerating state if the detection unit 21d is outputting a voltage in the − direction when the car 5 is lowered. The sound field control unit 21a determines that the car 5 is in a constant speed state during descent when the voltage value output by the detection unit 21d becomes 0 or almost 0 after being in a negative voltage state. judge. Furthermore, when the voltage value output by the detection unit 21d becomes a voltage in the + direction after being in a 0 or almost 0 state, the sound field control unit 21a determines that the car 5 is in a deceleration state when descending. judge. Further, the sound field control unit 21a determines that the car 5 is in a stopped state when the voltage value outputted by the detection unit 21d becomes 0 or almost 0 after the positive voltage state. . The sound field control unit 21a adjusts the sound pressure level of the audio content according to the determined state of the car 5.

FIGS. 24 and 25 are diagrams showing threshold values set for the output voltage of the detection section 21d. For the output voltage of the detection unit 21d, the threshold values shown in FIGS. 24 and 25 may be set as necessary. The reason is explained below.

The car 5 is suspended by a main rope 4, as shown in FIG. Therefore, if a user intentionally makes noise inside the car 5, it is assumed that vibrations will occur transiently. Therefore, as shown in FIG. 24, a threshold value is set in advance for the "rise time in the positive voltage direction" of the output voltage of the detection unit 21d (time segment (U1) in FIG. 19 and time segment (D4) in FIG. 23). Set it up. Hereinafter, this threshold value will be referred to as a second threshold Th2. When the output voltage of the detection unit 21d increases, the sound field control unit 21a controls a “positive voltage” in the output voltage of the detection unit 21d when the increased state continues for a period equal to or greater than the second threshold Th2. It is determined that it is the “rise time in the direction”. This can prevent the sound field control unit 21a from making an incorrect determination based on transiently generated vibrations.

Similarly, as shown in FIG. 24, for the "fall time in the positive voltage direction" of the output voltage of the detection unit 21d (time segment (U2) in FIG. 19 and time segment (D5) in FIG. 23), Also, a threshold value is set in advance. Hereinafter, this threshold value will be referred to as a third threshold Th3. When the output voltage of the detection unit 21d decreases, the sound field control unit 21a controls a “positive voltage” in the output voltage of the detection unit 21d when the decreasing state continues for a period equal to or greater than the third threshold Th3. It is determined that the fall time in the direction This can prevent the sound field control unit 21a from making an incorrect determination based on transiently generated vibrations.

Similarly, as shown in FIG. 25, for the "fall time in the negative voltage direction" of the output voltage of the detection unit 21d (time segment (U4) in FIG. 19 and time segment (D1) in FIG. 23), Also, set a threshold value. Hereinafter, this threshold will be referred to as a fourth threshold Th4. When the output voltage of the detection unit 21d decreases, the sound field control unit 21a controls a “negative voltage” in the output voltage of the detection unit 21d when the decreasing state continues for a period equal to or greater than the fourth threshold Th4. It is determined that it is the “rise time in the direction”. Similarly, a threshold value is set in advance for the "fall time in the negative voltage direction" (time segment (U5) in FIG. 19 and time segment (D2) in FIG. 23). Hereinafter, this will be referred to as the fifth threshold Th5. The sound field control unit 21a controls the output voltage of the detection unit 21d to become a “negative voltage” when the output voltage of the detection unit 21d increases and this state of increase continues for a period equal to or greater than the fifth threshold Th5. It is determined that the fall time in the direction This can prevent the sound field control unit 21a from making an incorrect determination based on transiently generated vibrations.

In the above description, as shown in FIG. 4, in the acoustic system 13, the sound field control device 21 and the speaker system 22 are separately arranged. However, it is not limited to this case. FIG. 26 is a diagram showing a configuration of a modified example of the acoustic system 13 according to the first embodiment. As shown in FIG. 26, the sound field control device 21 and the speaker system 22 may be arranged within a housing 210 of the sound field control device 21. That is, the detection unit 21d is also arranged within the housing 210. In the case of the configuration shown in FIG. 26, the sound field control device 21 and the speaker system 22 are arranged in one housing 210, and the audio system 13 is packaged. Therefore, when installing the audio system 13, steps such as wiring work are not necessary, and the installation work of the audio system 13 is extremely easy. Furthermore, instead of the emergency speaker 5g shown in FIG. 2, the acoustic system 13 shown in FIG. 26 may be installed. In this case, the wiring connected to the emergency speaker 5g may simply be reconnected to the audio system 13. The acoustic system 13 shown in FIG. 26 is packaged and can be easily installed in the existing elevator 1. Note that although FIG. 26 shows an example in which one speaker cabinet 20 is provided, the number of speaker cabinets 20 may be two or more. Furthermore, the number of speaker units 23 in the speaker cabinet 20 may be any number greater than or equal to one.

Further, in the above description, the detection unit 21d is composed of an acceleration sensor, and the sound field control unit 21a determines whether the state of the car 5 is accelerated, constant speed, decelerated, etc. based on the physical quantity detected by the detection unit 21d. The description has been made by taking as an example the case where it is determined whether the vehicle is stopped or not. In this case, as shown in FIG. 16, there is a possibility that the physical quantity when the car is traveling at a constant speed is equal to the physical quantity when the car is stopped. Therefore, the sound field control unit 21a may determine whether the car 5 is in a stopped state or a constant speed running state, for example, using the following determination method. To explain using the example of FIG. 16, the car 5 is in a stopped state during time segments (1), (3), (5), and (7). Taking time segment (3) as an example, if the time length between time segment (2) and time segment (4) is longer than a preset time, the sound field control unit 21a It is determined that the state No. 5 indicates that the vehicle is stopped and not running at a constant speed. That is, the sound field control unit 21a determines whether a preset time has elapsed after the output of the acceleration sensor (i.e., the output of time segment (2)) indicating the running (ascending or descending) of the car 5 is generated. Also, if the output of the acceleration sensor indicating the next run (ascending or descending) (that is, the output in time segment (4)) does not occur, it is determined that the car 5 is in a stopped state. More specifically, if a positive or negative "rising" does not occur even after a preset time has elapsed after a positive or negative "falling", the sound field control unit 21a , it is determined that car 5 is in a stopped state. On the other hand, if a positive or negative "rising" occurs before a preset time elapses after a positive or negative "falling" occurs, the sound field control unit 21a controls whether the car 5 is It is determined that the vehicle is running at a constant speed. Note that the set time is, for example, 3 minutes. However, the set time is not limited to this case, and may be set to any other length of time as appropriate. The constant speed running during the upward movement in the time period (U3) shown in FIG. 17 and the constant speed movement during the downward movement in the time period (D3) shown in FIG. 23 do not last for more than 3 minutes. Therefore, if the sound field control unit 21a uses the determination method to determine whether the car 5 is in a stopped state or a constant speed running state, an erroneous determination will not occur.

Furthermore, in the above description, the case where the detection unit 21d is constituted by an acceleration sensor has been described as an example. However, as described above, the detection unit 21d may be composed of an air pressure sensor or a speed sensor.

FIG. 27 is a diagram showing the relationship between the detection result and the sound pressure level of the audio content when the detection unit 21d is an atmospheric pressure sensor. FIG. 27(a) shows a change in the sound pressure level of the audio content under the control of the sound field control section 21a, and FIG. 27(b) shows a waveform of the detection result of the detection section 21d composed of an atmospheric pressure sensor. The detection result in FIG. 27(b) shows the same tendency as the detection result in FIG. 20(b). Therefore, it is clear that the sound field control section 21a can perform the same "fade-in" processing and "fade-out" processing as described above even when using the detection results of the detection section 21d composed of an atmospheric pressure sensor. be. When the detection section 21d is constituted by an atmospheric pressure sensor, the detection section 21d is installed on the outer surface of the side plate 5a of the car 5, for example.

In addition, when the detection section 21d is composed of a speed sensor, the detection results of the detection section 21d have waveforms shown in FIGS. 17(b) and 22(b). Therefore, when using the detection result of the detection unit 21d composed of a speed sensor, "fade-in" processing is performed between times t1 and t2 in FIGS. 17(b) and 22(b), and ) and "fade out" processing is performed between time t3 and time t4 in FIG. 22(b). In this way, even when using the detection result of the detection section 21d composed of a speed sensor, the sound field control section 21a can perform the same "fade-in" processing and "fade-out" processing as described above.

As described above, the acoustic system 13 according to the first embodiment includes the detection section 21d and the sound field control section 21a. The detection unit 21d detects a physical quantity indicating the running state of the car 5 of the elevator 1. The sound field control unit 21a controls reproduction and stop of the audio content based on the physical quantity detected by the detection unit 21d. In Patent Document 1 mentioned above, since the user plays and stops the audio content, if the user plays a prank, there is a possibility that playing back the audio content becomes stressful for other users. On the other hand, in the audio system 13 according to the first embodiment, the sound field control unit 21a controls the playback and stop of the audio content, so it is possible to prevent stress on other users. .

Furthermore, in the acoustic system 13 according to the first embodiment, the detection unit 21d detects physical quantities indicating the states of acceleration, constant speed, deceleration, and stop when the car 5 is ascending and descending. do. The sound field control unit 21a determines whether the state of the car 5 is accelerated, constant speed, decelerated, or stopped based on the physical quantity detected by the detection unit 21d. Adjust the sound pressure level of audio content according to the situation. In this way, the sound field control unit 21a can adjust the sound pressure level of the audio content according to the running state of the car 5. Therefore, by controlling the sound pressure level of the audio content to be lowered on the parking floor, it is possible to provide audio content that reduces the stress of the users without causing any harm to voice announcements to the users.

Furthermore, the audio system 13 according to the first embodiment controls playback and stop of the audio content based on the physical quantity detected by the detection unit 21d. The sound system 13 does not require information from an operating system such as the elevator control panel 7 that operates the elevator 1. Therefore, the sound system 13 is not electrically connected to the operating system. Therefore, the sound system 13 does not require complicated work such as wiring work with an operating system, and can simply be placed inside the car 5, so it can be easily installed even in an existing elevator.

Furthermore, in the sound system 13 according to the first embodiment, when the sound field control unit 21a determines that the car 5 is in an accelerated traveling state when ascending or descending, the sound pressure level of the acoustic content is gradually adjusted. Performs fade-in processing to increase the size of the image. As a result, the sound pressure level of the audio content gradually increases from the time when the car 5 starts running until it reaches constant speed running. If the user comes into contact with the reproduction of audio content with a high sound pressure level as soon as the user gets on the car 5, the user may feel uncomfortable or uncomfortable. However, by performing the fade-in process of gradually increasing the sound pressure level as in the first embodiment, the user can naturally become familiar with the reproduction of the audio content and enjoy the reproduction.

Furthermore, in the sound system 13 according to the first embodiment, when the sound field control unit 21a determines that the car 5 is in a state of deceleration traveling when ascending or descending, the sound pressure level of the acoustic content is gradually adjusted. Performs fade-out processing to make the image smaller. As a result, the sound pressure level of the audio content gradually decreases from the time when the car 5 starts decelerating until it reaches the stopped state. If the user suddenly stops hearing the sound of the audio content as soon as the car 5 stops, the user may feel uncomfortable or uncomfortable. However, by performing a fade-out process that gradually lowers the sound pressure level as in the first embodiment, it is possible to prevent the user from feeling uncomfortable or uncomfortable. Furthermore, when the car 5 is stopped, the sound pressure level of the audio content is at the minimum value Min, which prevents the user from missing the audio announcement. It will not leak into the boarding area. Therefore, it is possible to prevent the reproduced sound of the audio content from becoming noise for people on the parking floor who do not use the elevator.

Furthermore, in the sound system 13 according to the first embodiment, when the sound field control unit 21a determines that the car 5 is in a constant speed traveling state when ascending or descending, the sound pressure level of the acoustic content is adjusted. Performs control to maintain a constant value. The constant value at this time is the maximum value Max. As mentioned above, the sounds propagated into the car 5 while the car 5 is running include the "sliding noise" between the car guide shoe and the car rail, and the "sliding noise" between the sheave 3a and the main rope 4. It becomes a "sliding sound". In the first embodiment, when the car 5 is running at a constant speed, the sound pressure level of the audio content is controlled to be maintained at the maximum value Max, so that the user does not feel these "sliding sounds" too much. You can spend your time comfortably even inside the closed car 5.

Furthermore, in the acoustic system 13 according to the first embodiment, two or more speaker cabinets 20 or two or more speaker units 23 may be provided. In that case, sound radiation from multiple directions becomes possible. Thereby, the sound field control unit 21a can form a three-dimensional sound field 27 in the closed space inside the car 5. Generally, users often feel "awkward" and "uncomfortable" in the car 5 with people they do not know. In the first embodiment, since it is possible to reproduce audio content using the three-dimensional sound field 27, it is possible to provide comfort to the user and reduce stress caused by "awkwardness" and "discomfort" of the user. can be reduced.

Furthermore, as shown in FIG. 4, audio content may be prepared for each season and each time of day, and the audio content may be switched according to the actual season and time of day. In that case, the user will not feel sluggish and will be able to feel the change of seasons and the change in the time zone of the user's life, allowing the user to "relax" and "take a breather." ” is likely to lead to this. As a result, it leads to further stress reduction for users.

1 elevator, 2 hoistway, 3 hoisting machine, 3a sheave, 4 main rope, 5 car, 5a side plate, 5b floor plate, 5c ceiling plate, 5d car door, 5e lighting device, 5ea irradiation surface, 5f car operation panel, 5g Emergency speaker, 5h Intercom device, 7 Elevator control panel, 8 Control cable, 9 Car control device, 9a Input section, 9b Control section, 9c Output section, 9d Storage section, 10 Suspended ceiling, 10a Side surface, 10b Bottom surface, 11 air gap, 13 elevator acoustic system (acoustic system), 20 speaker cabinet, 21 sound field control device, 21a sound field control section, 21b output section, 21c storage section, 21d detection section, 21e timer section, 22 speaker system, 23 speaker unit, 23-1 speaker unit, 23-2 speaker unit, 23L speaker unit, 23L-1 speaker unit, 23L-2 speaker unit, 23R speaker unit, 23R-1 speaker unit, 23R-2 speaker unit, 23a radiation surface, 25 housing, 25a front, 27 sound field, 27a lower limit, 40 acoustic content generation device, 40a output unit, 40b signal processing unit, 40c storage unit, 40d input unit, 210 housing, 211 sensor element, 211a vibrating membrane, 211b Support part, 211c Exterior case, 212 Board.

Claims (10)

A speaker system placed on the ceiling of the interior space of the elevator car,
a storage unit that stores acoustic content emitted from the speaker system;
a sound field control unit that reproduces the audio content and causes the speaker system to radiate the audio content to the interior space of the car;
a detection unit provided in the car and detecting a physical quantity indicating a running state of the car;
The sound field control unit determines the running state of the car based on the physical quantity detected by the detection unit, and adjusts the sound pressure level of the audio content according to the running state of the car,
The sound field control unit and the detection unit are not electrically connected to an elevator control panel that controls operation of the elevator, and are provided independently;
The detection unit detects the physical quantity indicating each of the states of acceleration running, constant speed running, deceleration running, and stopping when the car is ascending and descending,
The sound field control unit determines whether the car is in one of the accelerated running, the constant speed running, the decelerated running, and the stopped state based on the physical quantity detected by the detection unit. and adjusting the sound pressure level of the audio content according to the determined state of the car;
The sound field control section includes:
the sound pressure level of the audio content to be emitted from the speaker system when it is determined that the car is in the deceleration running state during the ascent or the descent based on the physical quantity detected by the detection unit; Performs a fade-out process that gradually reduces the
Sound system for elevators. The sound field control section includes:
the sound pressure level of the acoustic content that is emitted from the speaker system when it is determined that the car is in the accelerated traveling state during the ascent or the descent based on the physical quantity detected by the detection unit; performs a fade-in process that gradually increases the
The elevator sound system according to claim 1 . The sound field control section includes:
the sound pressure of the acoustic content to be emitted from the speaker system when it is determined that the car is in the constant speed traveling state during the ascent or the descent based on the physical quantity detected by the detection unit; Performs control to maintain the level at a constant value,
The elevator acoustic system according to claim 1 or 2 . The sound field control section includes:
the sound pressure level of the acoustic content that is emitted from the speaker system when it is determined that the car is in the accelerated traveling state during the ascent or the descent based on the physical quantity detected by the detection unit; A fade-in process is performed to gradually increase the sound pressure level to the first sound pressure level.
the sound pressure of the acoustic content to be emitted from the speaker system when it is determined that the car is in the constant speed traveling state during the ascent or the descent based on the physical quantity detected by the detection unit; performing control to maintain the level at the first sound pressure level;
the sound pressure level of the audio content to be emitted from the speaker system when it is determined that the car is in the deceleration running state during the ascent or the descent based on the physical quantity detected by the detection unit; performing fade-out processing to gradually reduce the sound pressure level from the first sound pressure level to the second sound pressure level;
The elevator sound system according to claim 1 . The elevator has an emergency speaker that emits an audio announcement into a space within the car;
the second sound pressure level is greater than 0 and smaller than the sound pressure level of the voice announcement;
the first sound pressure level is equal to or higher than the sound pressure level of the audio announcement;
The elevator sound system according to claim 4 . The sound field control section includes:
Based on the physical quantity detected by the detection unit, it is determined that the car is in the stopped state, and when the stopped state continues for a preset time equal to or longer than an unmanned determination threshold, the audio content is control to stop playback,
The elevator acoustic system according to any one of claims 1 to 5 . The detection unit is an acceleration sensor that detects, as the physical quantities, vibrations of the car and atmospheric pressure that change as the car runs and stops;
The elevator acoustic system according to any one of claims 1 to 6 . The detection unit is a speed sensor that detects the running speed of the car as the physical quantity.
The elevator acoustic system according to any one of claims 1 to 6 . The detection unit is an atmospheric pressure sensor that detects, as the physical quantity, the atmospheric pressure that the car receives, which changes as the car runs and stops.
The elevator acoustic system according to any one of claims 1 to 6 . Equipped with a timer section that counts the current date and time,
The storage unit stores a plurality of the audio contents created for each season and each time zone,
The sound field control unit acquires date and time data indicating the current date and time from the timer unit, and reads out audio content corresponding to the actual season and the actual time zone from the storage unit based on the date and time data. and causing the audio content to radiate from the speaker system.
The elevator acoustic system according to any one of claims 1 to 9 .

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