JP7197331B2 - parking lot management system - Google Patents

Description

TECHNICAL FIELD The present invention relates to a technique for guiding users of unpaid fees in a parking lot management system.

Techniques have been developed for notifying users of parking lots of information about fees.
Patent Literature 1 describes a roadside device that generates a warning using a speaker and a lamp and notifies the driver of the vehicle that the vehicle is parked unnecessarily when it receives a judgment result that the vehicle is parked unnecessarily from a control unit. there is
Patent Literature 2 describes a timer notification system that notifies the mobile communication device of a user using a parking lot of the remaining parking time.

JP 2004-178489 A JP 2005-11235 A

Voice guidance causes noise in residential areas. In addition, it is difficult to hear the voice guidance sent from the outside of the vehicle to the inside of the vehicle through a window glass. On the other hand, when sending radio waves instead of sound waves to a device in the car and having the device convert the radio waves into voice to convey a message to the passenger, it is necessary to access the passenger's mobile terminal or onboard device. Become.

One of the objectives of the present invention is to reduce the sound audible outside the target vehicle while increasing the sound audible inside the vehicle.

In order to solve the above-described problems, the present invention provides a specification unit that specifies a car in a parking lot for which a fee has not been paid, a frequency band in which a coincidence effect occurs in the window glass of the car, and a message transmission system in the specified frequency band. As a first aspect, there is provided a parking lot management system having a transmission control unit that causes the transmission unit to transmit a sound that transmits a.

According to the parking lot management system of the first aspect, it is possible to reduce the sound heard outside the target car and increase the sound heard inside the car.

The parking lot management system of the first aspect, comprising a display control unit that causes a display to prompt the vehicle to pay the fee when the transmission control unit causes the sound to be transmitted, The configuration may be adopted as the second aspect.

According to the parking lot management system of the second aspect, it is possible to prompt the passengers in the vehicle to pay the fee through their vision.

In the parking lot management system of the first or second aspect, a third configuration is that the specifying unit specifies the type of the car and specifies a frequency band pre-associated with the type as the frequency band. You may employ|adopt as an aspect.

According to the parking lot management system of the third aspect, the difference in the difficulty of transmitting voices due to different types of cars is reduced.

In the parking lot management system of the first or second aspect, the transmission control unit transmits sound waves with varying frequencies toward the window glass and measures the intensity of the reflected waves to specify the frequency band. may be employed as a fourth mode.

According to the parking lot management system of the fourth aspect, it is possible to increase the sounds heard inside the target vehicle according to the actual state of the target vehicle.

In the parking lot management system of the first or second aspect, the identification unit identifies the position and orientation of the vehicle using an optical sensor, and identifies the frequency band according to the position and orientation of the vehicle. You may employ|adopt as a 5th aspect.

According to the parking lot management system of the fifth aspect, it is possible to increase the sound heard inside the car according to the target position and direction of the car.
In the parking lot management system according to the first aspect, the transmission control unit emphasizes sound pressure in the specified frequency band and suppresses sound pressure in other than the frequency band with respect to the voice for transmitting the message. A configuration may be adopted as a sixth aspect, in which the processed sound is processed and the processed sound is transmitted.
According to the parking lot management system of the sixth aspect, it is possible to process the voice for transmitting the message so as to emphasize the frequency band in which the coincidence effect occurs.
In the parking lot management system of the first aspect, the transmission control unit selects a sound composed of sound in the specified frequency band from among a plurality of pre-stored sounds for transmitting the message, A configuration in which the selected sound is transmitted may be employed as a seventh aspect.
According to the parking lot management system of the seventh aspect, it is possible to select and transmit a sound that produces a coincidence effect from among a plurality of pre-stored sounds.

The figure which shows the example of a structure of the parking lot management system 9 which concerns on one Embodiment of this invention. 1 is a schematic diagram of a parking lot P to which a parking lot management system 9 is applied; FIG. The figure which shows an example of charge DB121 which the memory|storage part 12 memorize|stores. 4 is a diagram showing an example of a vehicle name DB 122 stored in a storage unit 12; FIG. A diagram for explaining the coincidence effect. 2 is a diagram showing a functional configuration of a management device 1; FIG. 4 is a flowchart showing the flow of operations of the management device 1; The figure which shows the example of a structure of 9 A of parking management systems in a modification. The figure which shows the functional structure of 1 A of settlement apparatuses, and the image recognition apparatus 1B.

<Embodiment>
<Configuration of management device>
FIG. 1 is a diagram showing an example of the configuration of a parking lot management system 9 according to one embodiment of the present invention. A parking lot management system 9 shown in FIG. The management device 1 has a control section 11 , a storage section 12 , an operation section 14 , a display section 15 and a connection section 16 .

The control unit 11 is means for controlling the operation of each unit of the management device 1 . The control unit 11 includes an arithmetic processing unit such as a CPU (Central Processing Unit) and a storage device such as a ROM (Read Only Memory) and a RAM (Random Access Memory). Run the program.

The connection unit 16 connects the control unit 11 of the management apparatus 1 to external devices for the management apparatus 1, that is, each of the transmission unit 3, the imaging unit 6, and the sound collection unit 7, and controls these external devices. It relays communication with the unit 11. Thereby, the control unit 11 controls these external devices respectively.

In addition, the connection unit 16 is connected to an external device via a communication line such as the Internet (not shown). Information indicating the vehicle number for uniquely identifying the vehicle and the fee paid to the parking lot by the user of the vehicle (hereinafter referred to as parking history information) may be acquired in association with each other.

The storage unit 12 is storage means such as a solid state drive or a hard disk drive, and stores various programs, data, etc. read by the CPU of the control unit 11 .

The storage unit 12 also stores a charge DB 121 , a car name DB 122 and voice data 123 .

The operation unit 14 includes operation buttons, a keyboard, a touch panel and the like for giving various instructions, receives operations by the user, and sends signals corresponding to the operation contents to the control unit 11 .

The operation unit 14 also includes a sorter 141 that sorts and counts the inserted banknotes and coins, and supplies information on the number of counted banknotes and coins to the control unit 11 . The control unit 11 identifies the amount of fees paid to the user from the information supplied from the sorter 141 of the operation unit 14 .

The display unit 15 has a display screen such as a liquid crystal display, and displays images under the control of the control unit 11 . A transparent touch panel of the operation unit 14 may be superimposed on the display screen.

The sending unit 3 is a device that sends out the sound instructed by the control unit 11, and is, for example, a speaker. Here, " send out sound" means to send sound, which is a sound wave, into space (that is, emit sound).

The imaging unit 6 is a device that supplies image data representing an image generated by imaging the inside of the parking lot to the control unit 11. For example, the imaging unit 6 is a camera equipped with an imaging device such as a CCD image sensor or a CMOS image sensor.

The sound pickup unit 7 is a device that collects sounds arriving from the surroundings or from a target direction, converts the sounds into digital data, and supplies the data to the control unit 11. For example, an omnidirectional microphone or a gun microphone is used. etc.

Note that the management device 1 may not have the display unit 15 . In this case, the management device 1 may cause the display unit, which is an external device, to display the image via the connection unit 16 .

Also, the sending unit 3 , the imaging unit 6 , and the sound collecting unit 7 may be provided in the management device 1 . Also, the parking lot management system 9 does not have to include the sound pickup unit 7 .

FIG. 2 is a schematic diagram of a parking lot P to which the parking lot management system 9 is applied. In FIG. 2 , the parking lot management system 9 has a plurality of imaging units 6 . A plurality of imaging units 6 shown in FIG. 2 are provided in each of a plurality of vehicle compartments R in a parking lot P, for example. At least one of the plurality of imaging units 6 is provided in an exit area G, which is an area through which the vehicle C exits the parking lot P. As shown in FIG. In addition, the imaging unit 6 does not have to be provided in plural units in the parking lot management system 9, and for example, only one unit may be provided in the exit area G.

In the exit area G, a management device 1 is provided. This management device 1 is arranged so that the screen displayed on the display unit 15 can be seen by passengers of the vehicle C on the side of the route through which the vehicle C passes in the exit area G. Further, the sending unit 3 is arranged so as to send out sound to passengers of the vehicle C when the vehicle C passes through the exit area G. As shown in FIG.

The sending unit 3 may be arranged to send the voice to the passenger from the front of the vehicle C through the windshield, or may be arranged to send the voice to the passenger from the side of the vehicle C through the side glass. may be placed. Further, the sending unit 3 may be arranged so as to send the sound to the passenger from the back of the vehicle C through the rear glass.

FIG. 3 is a diagram showing an example of the fee DB 121 stored by the storage unit 12. As shown in FIG. The fee DB 121 is a database for calculating fees according to use of the parking lot P. FIG. Fee DB 121 includes parking timetable 1211 and fee table 1212 .

The parking timetable 1211 includes a vehicle ID that identifies a vehicle that uses the parking lot P, a parking time that indicates when the vehicle identified by the vehicle ID was parked in one of the compartments R in the parking lot P, The payment amount indicating the amount of the fee already paid for the use of the parking lot P by the vehicle is stored in association with the payment amount.

The fee table 1212 stores a parking time segment indicating a parking time segment and a fee determined for parking within the time range indicated by the parking time segment in association with each other.

The image capturing unit 6 captures an image of the vehicle C parked in one of the compartments R and supplies image data representing the image of the vehicle C to the control unit 11 of the management device 1 via the connection unit 16 .

Based on the supplied image data, the control unit 11 performs image recognition processing on the area corresponding to the license plate in the image of the vehicle C captured by the imaging unit 6 . Then, the control unit 11 specifies the vehicle number of the vehicle C as a result of the image recognition processing, and stores it in the parking timetable 1211 as a “vehicle ID” for identifying the vehicle C. FIG.

In addition, the control unit 11 acquires the “parking time”, which is the time when the vehicle C starts to park in the compartment R, and stores it in the parking timetable 1211 in association with the vehicle ID of the vehicle C.

In addition, the control unit 11 specifies the amount of the fee that has already been paid for the use of the parking lot P by the parked vehicle C, and defines the specified amount as the "payment amount", which corresponds to the vehicle ID of the vehicle C. It is stored in the parking timetable 1211.

FIG. 4 is a diagram showing an example of the vehicle name DB 122 stored in the storage unit 12. As shown in FIG. The vehicle name DB 122 shown in FIG. 4 is identified by the vehicle name, which is the model name and model number of each vehicle in circulation, the vehicle feature amount, which is data indicating the characteristics of the appearance of the vehicle, and the vehicle name. It is a database that associates and stores frequency bands in which the coincidence effect occurs in the window glass used in the vehicle that is used. The frequency band may be determined for each combination of sound incident angle, window glass, air temperature, and the like.

The car name DB 122 is an example of a database that associates the type of car with the frequency band in which the coincidence effect occurs in the window glass used in the car of that type, and the car name is used as the type of car. there is For example, when it is specified that the window glass with different characteristics of the coincidence effect is used for each vehicle type, that is, when the frequency band in which the coincidence effect occurs in the window glass is determined by the vehicle type, the vehicle type is used as the type of vehicle. A database may be stored in the storage unit 12 .

FIG. 5 is a diagram for explaining the coincidence effect. The horizontal axis of FIG. 5 indicates the center frequency [Hz], and the vertical axis indicates the acoustic equivalent loss [dB]. When sound is incident on the window glass, if the phase of the incident wave parallel to the window glass is close to the phase of the bending wave of the window glass, resonance occurs and the transmission loss when the sound passes through the window glass increases. descend. This phenomenon is called the coincidence effect. The center frequency of the sound when the transmission loss is lowered is affected by the incident angle of the sound, the material and configuration of the window glass, the temperature, and the like.

For example, double glazing composed of two sheets of float glass with a thickness of 5 mm (hereinafter also referred to as "millimeters") and a layer of air with a thickness of 6 mm sandwiched between the two sheets of float glass , the acoustic characteristics of plot group D1 in FIG.

The frequency band in which the coincidence effect occurs is determined according to the thickness of one windowpane. Here, as shown in plot f1, the transmission loss is significantly reduced for sound with a center frequency of 2400 Hz.

Plot f3 indicates the low-range resonance transmission frequency peculiar to double glazing. In this multi-layered glass, the transmission loss of sound with a center frequency of 310 Hz is lower than that of sounds with other frequencies.

On the other hand, one sheet of float plate glass with a thickness of 10 mm exhibits the acoustic characteristics of plot group D2 in FIG. Here, as shown in plot f2, the transmission loss drops significantly for sound with a center frequency of 1200 Hz.

<Functional Configuration of Management Device>
FIG. 6 is a diagram showing the functional configuration of the management device 1. As shown in FIG.
The control unit 11 functions as a determination unit 110, a specification unit 111, a transmission control unit 112, a display control unit 113, and a measurement unit 114 by executing the above programs.

When the imaging unit 6 captures an image of the vehicle C arriving at the parking lot P, the image capturing unit 6 generates image data representing the captured image and supplies the image data to the control unit 11 . The identification unit 111 implemented by the control unit 11 performs image recognition processing on the supplied image data to identify the vehicle name of the vehicle C described above. Further, the identification unit 111 performs optical character recognition processing on the supplied image data to identify the vehicle number of the vehicle C described above, and determines whether the vehicle C is parked in one of the compartments R in the parking lot P. Get the first parking time.

In the image recognition processing, for example, feature information stored in advance for each type of car (here, car name) and feature information indicating the feature of the vehicle C specified from the image captured by the imaging unit 6 are used. By matching. As the feature information, for example, feature information obtained by statistically processing HOG (Histograms of Oriented Gradients) feature amounts can be used. Either may be adopted.

The determination unit 110 specifies the payment amount for the vehicle C according to the operation of the operation unit 14, and stores it in the parking timetable 1211 of the fee DB 121 in association with the vehicle number and the parking time of the vehicle C.

Further, when the vehicle C is imaged by the imaging unit 6 installed in the exit area G, that is, when the vehicle C enters the exit area G, the identifying unit 111 identifies and determines the vehicle number of the vehicle C. Tell the part 110.

The determination unit 110 identifies the above-described vehicle C based on the transmitted vehicle number, reads the parking time stored in association with the vehicle C from the parking time table 1211 of the fee DB 121, and determines the current parking time from the parking time. Calculate the elapsed time to the time. Then, the determining unit 110 refers to the price table 1212 of the price DB 121 to identify the parking time segment corresponding to the calculated elapsed time, and identifies the fee determined in association with the parking time segment. The determining unit 110 compares the specified fee with the amount of payment for the vehicle C described above, and determines whether or not the vehicle C is an unpaid vehicle in the parking lot P (hereinafter, also referred to as an undelivered vehicle). , the determination result is transmitted to the identification unit 111 . When the connection unit 16 acquires the above-described parking history information from an external device, the determination unit 110 uses the transmitted vehicle number and parking history information to determine whether or not the vehicle C has not yet been delivered. may be determined.

As a result of the determination, if the vehicle C has not yet been delivered, the specifying unit 111 reads out the frequency band corresponding to the vehicle name of the vehicle C from the vehicle name DB 122 and notifies the transmission control unit 112 of the frequency band.

The transmission control unit 112 transmits voice for transmitting a message in the frequency band transmitted from the specifying unit 111 . For example, the transmission control unit 112 processes the voice of the message stored in the voice data 123 by emphasizing the sound pressure in the frequency band described above and suppressing the sound pressure in other frequency bands. You may make the transmission part 3 transmit the sound|speech which carried out. In addition, the transmission control unit 112 selects audio data composed of sound in the frequency band described above from among a plurality of audio data stored in advance in the audio data 123, and transmits audio based on the selected audio data to the transmission unit 3. may be sent to

That is, the management device 1 specifies the type of the car for which the toll has not been paid in the parking lot P, and transmits a voice for transmitting a message in the frequency band associated with the type in advance to the transmission unit 3. send out.

When the transmission control unit 112 causes the transmission unit 3 to transmit the above-described voice, the display control unit 113 causes the display unit 15 to display a display prompting the vehicle C to pay the fee. This display may include a number indicating the difference between the payment amount and the fee compared by the determination unit 110, or may include numbers indicating each of them.

In other words, the management device 1 sends out a voice to the unpaid car and displays a message to prompt the car to pay the toll.

Further, the transmission control section 112 may cause the transmission section 3 to transmit sound waves for testing. This test sound wave is a sound wave whose frequency changes with time, and is sent toward the vehicle C by the sending unit 3 .

When the transmission unit 3 transmits test sound waves toward the vehicle C, the measurement unit 114 measures the intensity of the reflected wave that the test sound waves reach the window glass of the vehicle C and are reflected. The measurement unit 114 notifies the transmission control unit 112 of the measured intensity.

The transmission control unit 112 specifies the frequency band in which the coincidence effect occurs on the window glass of the vehicle C described above, based on the intensity of the transmitted reflected wave. Then, the transmission unit 3 transmits the voice for transmitting the message to the vehicle C in the specified frequency band.

That is, the management device 1 sends out sound waves with varying frequencies toward the windshield of the vehicle and measures the intensity of the reflected waves, thereby specifying the frequency band in which the coincidence effect occurs on the windshield.

<Operation of management device>
FIG. 7 is a flowchart showing the operation flow of the management device 1. As shown in FIG. The control unit 11 of the management device 1 determines whether or not the vehicle C about to leave the exit area G is undelivered based on the image captured by the imaging unit 6 and the operation received by the operation unit 14. (step S101).

When determining that the vehicle C about to leave the exit area G is not undelivered (step S101; NO), the control unit 11 terminates the process. Therefore, in this case, no message is sent to the passenger of vehicle C that the parking fee has not been paid.

On the other hand, if it is determined that the vehicle C about to leave the exit area G has not yet been delivered (step S101; YES), the control unit 11 causes the display unit 15 to display a message prompting the passengers of the vehicle C to pay. (step S102). Then, the control unit 11 specifies the frequency band in which the coincidence effect occurs in the window glass of the vehicle C (step S103).

This identification may be performed, for example, by identifying the vehicle name of the vehicle C through image recognition processing and searching the vehicle name DB 122 using this vehicle name.

In addition, the control unit 11 causes the sound collecting unit 7 to collect the reflected waves of the test sound waves transmitted by the transmitting unit 3, and measures these reflected waves to obtain the frequency band in which the coincidence effect occurs in the window glass of the vehicle C. may be specified.

After specifying the frequency band in step S103, the control unit 11 causes the sending unit 3 to send out the voice for transmitting the message in that frequency band (step S104). Note that the control unit 11 may perform the display of step S102 after steps S103 and S104 after determining that the vehicle C has not been delivered in step S101.

The voice sent by the sending unit 3 is, for example, ``If you are using a vehicle with a license plate ◎◎◎◎, you have not paid for the parking lot. Please."

By the above operation, the management device 1 transmits a voice for transmitting a message to the unpaid car in the parking lot P in the frequency band in which the coincidence effect occurs on the window glass of the car. Audio tuned to this frequency band has a reduced amount of transmission loss in the car's window glass due to the coincidence effect, so even if the sound heard outside the car is reduced, the sound heard inside the car increases. do. Therefore, according to the management device 1, for example, even if a passenger forgets to pay the toll due to negligence and misses the message on the display installed in the exit area G, the passenger can easily notice the obligation to pay the toll.

Further, according to the management device 1 described above, since the voice guidance is provided through the window glass, it is difficult for the exhaust gas or the like to flow into the vehicle C, and there is no physical contact. Reduces troubles between

The configurations, shapes, sizes, and arrangement relationships described in the above embodiments are merely schematic representations to the extent that the present invention can be understood and implemented. Therefore, the present invention is not limited to the described embodiments, but can be modified in various forms without departing from the scope of the technical idea indicated in the claims.

<Modification>
The above is the description of the embodiment, but the content of this embodiment can be modified as follows. Also, the following modifications may be combined.

<Modification 1>
In the above-described embodiment, in order to specify the frequency band in which the coincidence effect occurs in the undelivered window glass, the control unit 11 specifies the car name of the vehicle C by image recognition processing, and uses the car name. The DB 122 is searched, or the reflected waves of the test sound waves sent by the sending part 3 are collected by the sound collecting part 7 and these reflected waves are measured, but the method of specifying the frequency band is limited to this. can't

For example, the management device 1 may identify the position and orientation of the undelivered vehicle using an optical sensor, and identify the frequency band according to the identified position and orientation. In this case, the optical sensor may be the imaging unit 6 described above, or may be a combination of a light emitting element and a light receiving element.

Light used in the optical sensor may be infrared light, ultraviolet light, or other light other than visible light as long as it is an electromagnetic wave. The management device 1 may also specify the frequency band for undelivered vehicles that are not located inside the exit area G, and transmit the above-described sound.

<Modification 2>
In the above-described embodiment, the management device 1 identifies the type of undelivered vehicle based on the image captured by the imaging unit 6, identifies the frequency band associated with the type in advance, and The above-mentioned frequency band was specified by transmitting sound waves with varying frequencies toward the window glass of the delivered car, collecting the reflected waves by the sound collecting unit 7, and measuring the intensity thereof. may not be performed.

In short, the management device 1 can transmit a voice for transmitting a message in a frequency band in which a coincidence effect occurs in the windshield of the car to the car in the parking lot for which the toll has not been paid.

<Modification 3>
In the above-described embodiment, the management device 1 has one sending unit 3, but may have a plurality of sending units 3. FIG. Further, the sending unit 3 may include a mechanism for adjusting the sending direction of sound (sending direction adjusting mechanism). The sending unit 3 having this sending direction adjusting mechanism is, for example, a movable directional speaker. The transmission direction adjustment mechanism adjusts the transmission direction of the sound of the transmission unit 3 using information on the position of the undelivered vehicle specified by the imaging unit 6 or the optical sensor, for example.

If one of the plurality of sending units 3 is provided with a sending direction adjusting mechanism, the management device 1 may send the sound toward the head of the passenger of the vehicle C from a plurality of directions. By transmitting the sound from two or more transmitting units 3, the sound transmitted through the window glass of the vehicle C is amplified, so that the passenger inside the vehicle C can easily hear the sound.

<Modification 4>
The program executed by the control unit 11 of the management device 1 is a computer-readable recording medium such as a magnetic recording medium such as a magnetic tape or a magnetic disk, an optical recording medium such as an optical disc, a magneto-optical recording medium, or a semiconductor memory. may be provided in a state stored in the It is also possible to download this program via a communication line such as the Internet. Various devices other than the CPU may be applied as the control means exemplified by the control unit 11, and for example, a dedicated processor may be used.

<Modification 5>
In the embodiment described above, the parking lot management system 9 has one management device 1, but may have a plurality of management devices 1. FIG. Also, the management device 1 may be realized by a plurality of devices having different functions.

FIG. 8 is a diagram showing an example of the configuration of a parking lot management system 9A in a modified example. The parking lot management system 9A has a settlement device 1A, an image recognition device 1B, a sending unit 3, an imaging unit 6, and a sound collecting unit 7. The settlement device 1A has a control section 11A, a storage section 12A, an operation section 14, a display section 15, and a connection section 16A. Storage unit 12A stores charge DB 121 and voice data 123 . The connection section 16A connects with the transmission section 3 and the sound collection section 7 . The image recognition device 1B has a control section 11B, a storage section 12B, and a connection section 16B. Storage unit 12B stores vehicle name DB 122 . The connection section 16B is connected to the imaging section 6 . Also, the connection portion 16A and the connection portion 16B are connected to each other. That is, the settlement device 1A and the image recognition device 1B exchange information with each other via the connection section 16A and the connection section 16B.

FIG. 9 is a diagram showing functional configurations of the settlement device 1A and the image recognition device 1B. The image recognition device 1B is a device that implements a function of identifying the name of the vehicle C by performing image recognition processing on the image data supplied from the imaging unit 6 among the management devices 1 described above. That is, the control unit 11B of the image recognition device 1B functions as the identification unit 111. FIG.

The settlement device 1A has a function of determining whether or not the vehicle C is undelivered in the parking lot P, and a function of causing the transmitting unit 3 to transmit voice for transmitting a message in a frequency band that produces a coincidence effect for undelivered vehicles. , a function of causing the display unit 15 to display a display urging payment of the toll toward the vehicle C, and a function of transmitting test sound waves toward the vehicle C when the transmitting unit 3 transmits test sound waves toward the vehicle C. It is a device that realizes the function of measuring the intensity of the reflected wave that reaches and reflects. That is, the control unit 11A of the settlement device 1A functions as the determination unit 110, the delivery control unit 112, the display control unit 113, and the measurement unit 114.

As shown in FIG. 9, the functions of the management device 1 may be realized by cooperation of a plurality of devices.

DESCRIPTION OF SYMBOLS 1... Management apparatus, 1A... Settlement apparatus, 1B... Image recognition apparatus, 11, 11A, 11B... Control part, 110... Judgment part, 111... Specification part, 112... Transmission control part, 113... Display control part, 114... Measurement Part 12, 12A, 12B Storage unit 121 Fee DB 1211 Parking timetable 1212 Fee table 122 Car name DB 123 Voice data 14 Operation unit 141 Sorter 15 Display unit 16, 16A, 16B Connection unit 3 Sending unit 6 Imaging unit 7 Sound pickup unit 9, 9A Parking management system C Vehicle Exit area P Parking lot , R... Vehicle compartment.

Claims (7)

A specifying unit for specifying a car in a parking lot for which a fee has not been paid and a frequency band in which a coincidence effect occurs in the window glass of the car, and a transmitting unit for transmitting a voice for transmitting a message in the specified frequency band . a transmission control unit; and a parking lot management system. 2. The parking lot management system according to claim 1, further comprising a display control unit that causes a display to prompt the vehicle to pay the toll when the transmission control unit causes the sound to be transmitted. 3. The parking lot management system according to claim 1, wherein said specifying unit specifies a type of said vehicle, and specifies a frequency band previously associated with said type as said frequency band. 3. The parking lot management system according to claim 1, wherein said transmission control unit identifies said frequency band by transmitting sound waves with varying frequencies toward said window glass and measuring the intensity of reflected waves. . 3. The parking lot management system according to claim 1, wherein said identifying unit identifies the position and orientation of said vehicle using an optical sensor, and identifies said frequency band according to said position and orientation of said vehicle. The transmission control unit processes the sound for transmitting the message by emphasizing sound pressure in the specified frequency band and suppressing sound pressure in other than the frequency band, and processing the processed sound. 2. The parking lot management system according to claim 1, wherein the . 2. The transmission control unit selects, from among a plurality of pre-stored sounds for transmitting the message, a sound composed of sounds in the specified frequency band, and transmits the selected sound. The parking lot management system described in .

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