Aircraft wireless intercom system

Abstract

Disclosed is an aircraft wireless intercom system including: a relay device which converts a voice signal output from a wired intercom system into a digital signal, wirelessly transmits the digital signal to one or more portable transceivers, and converts a signal wirelessly received from the portable transceiver into a voice signal; and the portable transceiver which converts the voice signal collected through a microphone into a digital signal and wirelessly transmits the digital signal to the relay device. The relay device and the portable transceiver each include an array antenna for wireless communication between each other. The array antenna includes a vertical antenna responsive to vertical polarization and a horizontal antenna responsive to horizontal polarization. According to the present invention, it is possible to increase a transmission / reception distance and a transmission / reception rate of wireless communication by matching the polarization of a transmission end to the polarization of a reception end by using a pair of single-polarized antennas.

Description

Aircraft radio intercom system

[0001] The present invention relates to an aircraft wireless intercom system, and more specifically, to an aircraft wireless intercom system capable of simultaneous communication of 8 people and having a communication range of 2.4 km.

[0002] The contents presented in this section are intended merely to provide background information for the present invention and do not constitute prior art.

[0003] An intercom system is a communication system built on security within a confined space to enable voice calls between designated users. Intercom systems are applied in various fields, including residential, industrial, broadcasting / performance, and aircraft / vehicle environments; currently, their utility is expanding as digital wireless intercoms are being introduced into existing systems.

[0004] According to conventional technology, wired intercom systems used in aircraft have the disadvantage of causing many communication inconveniences due to distance limitations caused by the wires.

[0005] An aircraft wireless intercom system is required that enables users to communicate freely and respond to emergencies while moving inside the aircraft, and allows for free communication between the outside and inside during aircraft maintenance, through additional installation without replacing the existing wired intercom system.

[0006] As a technology related to the present invention, the digital wireless intercom system and the driving method thereof disclosed in the Korean Registered Patent Publication disclose a first active antenna and a second active antenna. The first active antenna and the second active antenna do not show a difference in structure, but only differ in the wireless communication distance of the second mobile terminal and the wireless communication distance of the third mobile terminal, and thus differ in configuration and effect compared to the present invention, which is characterized by an arrangement structure of two antennas.

[0007] The problem that the present invention aims to solve is to provide an aircraft wireless intercom system capable of digitizing voice signals and transmitting and receiving them wirelessly in conjunction with an existing aircraft wired intercom system.

[0008] The problem that the present invention aims to solve is to provide an aircraft radio intercom system equipped with an antenna that enables a transmission and reception range beyond the limits of line of sight.

[0009] The problem that the present invention aims to solve is to provide an aircraft wireless intercom system comprising a wireless terminal capable of both charging and replacing the battery, as a wireless terminal constituting the aircraft wireless intercom system.

[0010] The problem that the present invention aims to solve is not limited to the problems mentioned above, and other unmentioned problems will be clearly understood by those skilled in the art from the description below.

[0011] In order to achieve the above objectives, according to one embodiment of the technical concept of the present invention, an aircraft wireless intercom system is disclosed, comprising: a relay device that converts a voice signal output from a wired intercom system into digital form and transmits it wirelessly to one or more portable transceivers, and converts a signal received wirelessly from the portable transceivers into a voice signal; and the portable transceivers that convert a voice signal collected through a microphone into digital form and transmit it wirelessly to the relay device, wherein the relay device and the portable transceivers each include an array antenna for wireless communication between them, and the array antenna is configured to include a vertical antenna that responds to vertical polarization and a horizontal antenna that responds to horizontal polarization.

[0012] In addition, the aircraft radio intercom system may be configured such that the array antenna equipped in the portable transceiver is provided such that, among the vertical antenna and the horizontal antenna, one antenna is provided outside the portable transceiver and the other is provided inside.

[0013] In addition, the aircraft radio intercom system can be configured such that the vertical antenna and the horizontal antenna are positioned at an angle of 90 degrees in space.

[0014] Additionally, the aircraft radio intercom system may be configured such that a portable transceiver includes a power supply unit, and the power supply unit includes a battery socket in which a battery is installed; a charge / discharge unit capable of discharging the battery and, if the battery is a secondary battery, charging the battery; and a power control unit that controls the charging process and the discharging process of the charge / discharge unit.

[0015] In addition, the aircraft radio intercom system further includes a power supply unit that indicates whether a battery installed in a battery socket is a primary battery that cannot be recharged or a secondary battery that can be recharged, and a power control unit that determines whether the battery is a primary battery or a secondary battery by using at least one of the internal resistance, discharge characteristics, voltage characteristics, and current characteristics of the battery.

[0016] Specific details of other embodiments are included in "Specific details for implementing the invention" and the attached "drawings".

[0017] The advantages and / or features of the present invention and the methods for achieving them will become clear by referring to the various embodiments described below in detail together with the accompanying drawings.

[0018] However, it should be understood that the present invention is not limited to the configurations of each embodiment disclosed below, but may be implemented in various different forms, and that each embodiment disclosed in this specification is provided merely to make the disclosure of the present invention complete and to fully inform those skilled in the art of the scope of the present invention, and that the present invention is defined only by the scope of each claim of the claims.

[0019] According to the present invention, the transmission and reception distance and transmission and reception rate of wireless communication can be increased by matching the polarization of the transmitting end and the receiving end using a pair of antennas with fragmentation characteristics.

[0020] In addition, the portable transceiver included in the aircraft radio intercom system can use either a primary battery or a secondary battery, and has the function of preventing charging of the primary battery while charging the secondary battery.

[0021] The effects obtainable by an aircraft radio intercom system according to the technical concept of the present invention are not limited to the effects mentioned above, and other unmentioned effects will be clearly understood by those skilled in the art to which the present invention belongs from the description below.

[0022] FIG. 1 is an exemplary diagram of an aircraft radio intercom system according to one embodiment of the present invention.

[0023] Figure 2 is a block diagram of the relay device shown in Figure 1.

[0024] Figure 3 is a block diagram of the portable transceiver shown in Figure 1.

[0025] Figure 4 is an example of an antenna of a portable transceiver shown in Figure 1.

[0026] Figure 5 is an example diagram of an aircraft radio intercom system to explain noise canceling.

[0027] Before describing the present invention in detail, it should be understood that the terms and words used in this specification should not be interpreted as being limited to their ordinary or dictionary meanings, and that the inventor of the present invention may appropriately define and use the concepts of various terms to best describe their invention, and furthermore, that these terms and words should be interpreted in a meaning and concept consistent with the technical spirit of the present invention.

[0028] In other words, it should be understood that the terms used in this specification are used merely to describe preferred embodiments of the present invention and are not intended to specifically limit the content of the present invention, and that these terms are defined in consideration of the various possibilities of the present invention.

[0029] In addition, it should be noted that in this specification, singular expressions may include plural expressions unless the context clearly indicates a different meaning, and that even if they are expressed in a similarly plural form, they may include a singular meaning.

[0030] Throughout this specification, where it is stated that a component "includes" another component, unless specifically stated otherwise, this may mean that it does not exclude any other component but may include any other component.

[0031] Furthermore, it should be noted that in cases where it is stated that a component "exists inside or is installed in connection with" another component, this component may be installed in direct connection or contact with the other component, or it may be installed at a certain distance apart, and in the case where it is installed at a certain distance apart, there may be a third component or means for fixing or connecting the component to the other component, and a description of this third component or means may be omitted.

[0032] On the other hand, if it is stated that one component is "directly connected" or "directly connected" to another component, it should be understood that there is no third component or means.

[0033] Likewise, other expressions describing the relationship between each component, such as “between” and “right between”, or “adjacent to” and “directly adjacent to”, should be interpreted as having the same intent.

[0034] In addition, it should be understood that in this specification, terms such as “one side,” “other side,” “one side,” “other side,” “first,” “second,” etc., are used to clearly distinguish one component from another component, and that the meaning of the component is not restricted by such terms.

[0035] In addition, position-related terms such as "up," "down," "left," and "right" used in this specification should be understood as indicating the relative position of the corresponding component in the drawing, and unless an absolute position is specified, these position-related terms should not be understood as referring to an absolute position.

[0036] Furthermore, in specifying the reference numerals for each component of each drawing in this specification, the same component has the same reference numeral even if it is shown in different drawings; that is, the same reference numeral throughout the specification indicates the same component.

[0037] In the drawings attached to this specification, the size, position, connection relationships, etc., of each component constituting the present invention may be described in a partially exaggerated, reduced, or omitted manner for the convenience of explanation or to sufficiently clearly convey the concept of the present invention, and therefore, the proportions or scale may not be strictly accurate.

[0038] In addition, in the following description of the present invention, detailed descriptions of components that are deemed to unnecessarily obscure the essence of the present invention, such as known technologies including prior art, may be omitted.

[0039] Hereinafter, embodiments of the present invention will be described in detail with reference to the relevant drawings.

[0040] FIG. 1 is an exemplary diagram of an aircraft radio intercom system according to one embodiment of the present invention.

[0041] Referring to FIG. 1, the aircraft wireless intercom system (10) may be configured to include a relay device (100) and a portable transceiver (200). The relay device (100) includes an antenna (102) connected to an antenna connector in addition to a main body (101), and the portable transceiver (200) also includes an antenna (202) in addition to a main body (201), so that wireless communication is possible through the antenna.

[0042] The relay device (100) can receive power from the aircraft power unit (30) through the power connector (103) and can be connected to the wired intercom system (20) through the audio connector (104).

[0043] That is, the aircraft wireless intercom system (10) is connected to the wired intercom system (20) installed in the aircraft (1) to extend the communication range and enable wireless communication between portable transceivers (200).

[0044] The portable transceiver (200) may include a headset (203) including a microphone and a speaker, which is connected to the main body (201) via a wired or wireless connection.

[0045] Figure 2 is a block diagram of the relay device shown in Figure 1.

[0046] Referring to FIG. 2, the relay device (100) may be configured to include a main body (101) and an antenna (102). The main body (101) may be configured to include a wireless transceiver (110), a central processing unit (120), a power supply unit (130), an audio processing unit (140), an interface unit (150), and an input / output device unit (160).

[0047] The wireless transceiver (110) may be configured to include an antenna connector (J6), a Power Divider, an FEM, an LNA, and an RF Transceiver. The wireless transceiver (110) has the function of transmitting and receiving audio data and synchronization data through an antenna (102) connected to the antenna connector (J6).

[0048] The central processing unit (120) may be configured to include an MCU, SP1, UART1, UART2, I2C, and memory. The central processing unit (120) has the function of controlling audio processing, transmission and reception of data, and other input and output of data in the relay device (100).

[0049] The power supply unit (130) may be configured to include a power controller, an LDO, a DCDC, and a power connector (J7). The power supply unit (130) is connected to the aircraft power supply unit (30) through the power connector (J7) so that it can receive power, convert the power, and output a stable voltage.

[0050] The audio processing unit (140) may be configured to include a memory (EEPROM), an audio processor, and a codec. The audio processing unit (140) has the function of processing input audio data to produce an output, i.e., digital processing.

[0051] The interface section (150) includes various connectors (J1, J2, J3, J4, J5), and the various connectors can be connected to the central processing section (120) and the audio processing section (140).

[0052] The input / output device unit (160) may be configured to include various input / output devices, such as an LED lamp, a channel button, and an LED button. The input / output device unit (160) has the function of inputting commands and displaying various signals for a user inside the aircraft.

[0053] Figure 3 is a block diagram of the portable transceiver shown in Figure 1.

[0054] Referring to FIG. 3, the portable transceiver (200) may be configured to include a main body (201) and an antenna (202). The main body (201) may be configured to include a wireless transceiver (210), a central processing unit (220), a power supply unit (230), an audio processing unit (240), an interface unit (250), an input / output device unit (260), a Bluetooth module unit (270), and a battery socket (281).

[0055] The wireless transceiver (210) has the function of transmitting and receiving audio data input from and output from the portable transceiver (200).

[0056] The central processing unit (220) has the function of controlling data transmission and reception, audio processing, power supply and demand, and the input and output of various commands.

[0057] The power supply unit (230) may be configured to include a battery socket (281) in which a battery (282) is mounted, a charging / discharging unit (232, 233) capable of discharging the battery (282) and charging the battery (282) if the battery (282) is a secondary battery, and a power control unit (231) capable of controlling the charging and discharging processes of the charging / discharging unit (232, 233).

[0058] The power supply unit (230) may be configured to further include a display unit (234) that indicates whether the battery (282) mounted in the battery socket (281) is a primary battery that cannot be recharged or a secondary battery that can be recharged. That is, the battery (282) may be a primary battery corresponding to, for example, AA or AAA type batteries and a secondary battery corresponding to rechargeable batteries. And the power control unit (231) may determine whether the battery (282) mounted in the battery socket (281) is a primary battery or a secondary battery, and then display the type of battery through the display unit (234), for example, an LED lamp.

[0059] The power control unit (231) is characterized by determining whether the battery (282) is a primary battery or a secondary battery by using at least one of the internal resistance, discharge characteristics, voltage characteristics, and current characteristics of the battery.

[0060] A primary battery is an irreversible battery that cannot be recharged. Since it can no longer be used once discharge is complete, a charging unit (232) is not required. On the other hand, a secondary battery is a reversible battery that can be recharged. It can be recharged and used multiple times even after discharge. Therefore, a secondary battery requires a charging unit (232), and a protection circuit for controlling the charging and discharging process may be included in the charging unit (232).

[0061] Primary batteries have the characteristic of maintaining a relatively constant voltage during use, but the voltage drops sharply once discharge is complete. Secondary batteries change voltage depending on the state of charge. As discharge progresses, the voltage gradually decreases, and constant voltage fluctuations are observed during the charging process.

[0062] Primary batteries generally maintain a constant voltage, but the voltage drops sharply when the discharge is nearly complete. Secondary batteries gradually decrease in voltage depending on the discharge state. In addition, because repeated charging and discharging are possible, the voltage does not fluctuate significantly and can be used continuously.

[0063] Despite the indication of the primary battery or secondary battery by the display unit (234), charging may be attempted with the primary battery installed.

[0064] If charging is attempted, the voltage of the primary battery does not rise much, or rises temporarily and then drops rapidly again. Since charging attempts can be dangerous, if charging is attempted on the primary battery, the power control unit (231) can cut off the charging current input to the primary battery if it determines that the battery is a primary battery.

[0065] When attempting to charge the secondary battery, the voltage of the secondary battery gradually increases and maintains a constant voltage after charging. The power control unit (231) can monitor the charging state of the secondary battery through the charging unit (232).

[0066] The power control unit (231) can analyze the change pattern by observing the voltage of the battery when the battery is discharged. If the voltage of the battery drops rapidly after long-term use, the battery is likely a primary battery, and if it decreases steadily, the battery is likely a secondary battery.

[0067] Primary batteries are characterized by their inability to stably supply high current for a long time. Secondary batteries are characterized by their ability to stably supply high current and their relatively stable output voltage.

[0068] The internal resistance of a primary battery is relatively high. On the other hand, the internal resistance of a secondary battery is relatively low. The power control unit (231) measures the internal resistance of the battery and can predict whether the battery is a primary battery or a secondary battery based on the magnitude of the internal resistance.

[0069] The audio processing unit (240) may be configured to include various components, such as memory, such as EEPROM, an audio processor, a codec, and an impedance detector. The audio processing unit (240) has the function of processing input audio data and converting it into digital form.

[0070] The interface unit (250) can be connected to a headset (203) or an ICS connection gender cable. The interface unit (250) has the function of connecting an external device of the portable transceiver (200) and an internal MCU.

[0071] The input / output device unit (260) may be configured to include various input / output devices, such as an LED lamp, an up button, a down button, a function button, a save button, a PTT1 button, and a PTT2 button. The user can use the various input / output devices of the input / output device unit (260) to determine the status of the portable transceiver (200) and input commands.

[0072] The Bluetooth module (270) includes an antenna (271) so that wireless short-range communication between the portable transceiver (200) and the headset (203) can be enabled.

[0073] The battery socket (281) includes a mounted battery (282). Both a primary battery that cannot be recharged and a secondary battery that can be recharged can be mounted in the battery socket (281) as the battery (282).

[0074] Referring again to FIG. 1, the relay device (100) and the portable transceiver (200) may each include an antenna (102, 202) for wireless communication with each other. The antenna (102, 202) is a plurality of array antennas.

[0075] Figure 4 is an example of an antenna of a portable transceiver shown in Figure 1.

[0076] Referring to FIG. 4, the array antenna of the relay device (100) and the portable transceiver (200) may be configured to include a vertical antenna (291) that responds to vertical polarization and a horizontal antenna (295) that responds to horizontal polarization.

[0077] The array antenna provided in the portable transceiver (200) can be configured such that one of the vertical antenna (291) and the horizontal antenna (295) is provided outside the portable transceiver (200) and the other is provided inside. That is, in FIG. 4, the vertical antenna (291) is provided outside the portable transceiver (200), and the horizontal antenna (295) is provided inside the portable transceiver (200).

[0078] The antennas of the relay device (100) of the aircraft radio intercom system (10) and the portable transceiver (200) must have matching antenna characteristics to achieve maximum performance. For example, theoretically, when the polarity of the transmitting antenna is vertical and the polarity of the receiving antenna is vertical, the maximum received signal strength corresponds to 100% in percentage. Conversely, when the polarity of the transmitting antenna is horizontal and the polarity of the receiving antenna is horizontal, the maximum received signal strength corresponds to 100% in percentage. For other combinations, such as horizontal and vertical, or vertical and horizontal, the maximum received signal strength is significantly attenuated.

[0079] In existing wireless intercom systems, the antennas of the relay devices are installed horizontally on the ground, whereas the antennas of portable transceivers are carried by people and maintain a vertical orientation relative to the ground when a person is standing, resulting in polarization inconsistencies. Consequently, along with limitations on operating range, frequent interruptions in transmitted audio and noise occurred.

[0080] Another characteristic is that the communication protocol of existing wireless intercom systems was composed of a Star network structure in which multiple slaves are connected to a single master. The Star network structure is one in which all nodes, namely portable transceivers, are connected to the master, centered around a relay device, namely the master. This structure is characterized by the fact that it is virtually technically impossible to extend usage to a maximum of 800m due to the fragmentation of a single antenna and factors related to the communication protocol structure.

[0081] The radiation pattern of a single antenna in the conventional technology is donut-shaped, and depending on the pattern characteristics, the radiation range in the antenna z-axis direction is smaller than in the x and y-axis directions. According to the radiated power density value (Pd) of an ideal dipole antenna, the radiation intensity of a monopole as a function of angle from the z-axis is maximum at 90 degrees, 66% at 60 degrees, 39% at 45 degrees, 17% at 30 degrees, and 0% at 0 degrees. When tested in an actual indoor environment, there is a situation where attenuation of about 20 dB occurs depending on the antenna direction, which is about eight times shorter over a distance.

[0082] In the case of a wireless intercom system according to conventional technology, for smooth voice transmission and reception, the antenna maintains a radiation strength of -90dBm in the x and y axis directions at an LOS distance of 800mm, but in the z axis direction (within ±30 degrees), the signal strength is only 17%, resulting in poor communication quality. Also, the smooth voice transmission and reception distance is shortened by about 8 times to 100m.

[0083] The AD PCM (G.726) voice compression technology of wireless intercoms according to conventional technology is characterized by a large amount of information transmission required to send voice at a bit rate of 32kbps. When six people are talking simultaneously, 32bps * 6 = 192kbps, and the minimum required amount of information transmission is 192kbps, with additional information transmission required for channel, security, and synchronization.

[0084] The network of the aircraft wireless intercom system (10) according to one embodiment of the present invention is characterized by the ability to extend the additional distance through the relay function of a portable transceiver (200) utilizing a relay structure. In addition, stable communication quality can be maintained through the application of an array antenna. The aircraft wireless intercom system (10) is characterized by being connected to and compatible with a wired intercom system (20) installed on an aircraft.

[0085] According to an aircraft wireless intercom system (10) according to one embodiment of the present invention, a relay device (100) based on a relay network using a 2.4 GHz band frequency transmits a synchronization signal to a portable transceiver (200) as a master, and this can be relayed to another portable transceiver to enable full synchronization. Relaying is possible up to two times or more, so the communication range can be increased by more than three times.

[0086] The aircraft wireless intercom system (10) uses an array antenna, so it is possible to maintain stable call quality even in a dead zone with single antenna characteristics.

[0087] The connector (J1) is compatible with aircraft headsets, and the voice level changes according to the impedance of the aircraft headset, so various headsets can be connected to the connector (J1).

[0088] The vertical antenna (291) and the horizontal antenna (295) can be configured to be positioned such that the angle between them in space is 90 degrees. That is, the antenna can be designed as a dual array type, with the internal and external vertical and horizontal antennas fixed, and a signal transmission system can be established. By simultaneously providing vertical and horizontal communication wavelengths, fragmentation-type non-contact wavelength sections can be eliminated.

[0089] Dual array type antennas have a radiation pattern resembling two vertically joined donuts, which can eliminate shadow areas.

[0090] By configuring a mesh-type network through relays, the disadvantages of existing technology can be compensated for. All slave terminals, such as portable transceivers (200), can be stably connected through other slaves without needing to be directly connected to the master relay device (100). Accordingly, portable transceivers (200) located within the shadow area of ​​the relay device (100) can receive stable voice signals from other portable transceivers (200) to ensure clear sound quality.

[0091] Referring again to Fig. 4, an external antenna and an internal antenna are shown. No metal should be present within a minimum distance of 10 mm near the internal antenna. This allows the gain of the antenna to be increased.

[0092] For the alignment of the two antennas, the RF signal lines can be designed so that signals optimized by matching are distributed as shown in FIG. 4. The impedance matching standard of the RF chip (299) is 50 ohms (Ω), and the impedance matching of the signal lines (293, 296) intended for lossless transmission can also be designed to be 50 ohms. When the RF signal is divided in a 1:1 ratio, the wiring (298) must be set to 100 ohms, which is double the 50 ohms, to minimize loss, and then the impedance is gradually lowered to the antenna connection part, for example, the resistance of the connection part (294) and the connection part (297) is 79.71 ohms, so that the RF signal transmitted to the antennas (291, 295) can be transmitted with the least loss.

[0093] For example, the external antenna may be made of a shock-resistant material, such as PET or HYTREL G 3548 L, for 50-ohm impedance matching and minimization of the reflection coefficient in the 2.4GHz to 2.484GHz band. The internal antenna needs to be located on the outer edge of the device for radiation performance, considering 50-ohm impedance matching and minimization of the reflection coefficient in the 2.4GHz to 2.484GHz band, and needs to be spaced at least 10mm away from the metal inside.

[0094] The echo phenomenon occurring in a wireless intercom system is characterized by the fact that one's own voice is heard in one's own ears after a delay, and thus acts as a disruptive factor. The cause of the echo phenomenon is that the side tone of the audio panel of the wired intercom system (20) and the side tone of the portable transceiver (200) overlap, causing echo and howling to occur.

[0095] Figure 5 is an example diagram of an aircraft radio intercom system to explain noise canceling.

[0096] Referring to FIG. 5, the audio processing process between the wired intercom system (20), the relay device (100), and the portable transceiver (200) is depicted. The structure is such that the user's own voice (A) is transmitted to another person (B), and the other person's voice (B) is transmitted to the user. In this case, due to the echo phenomenon, the user hears a side tone (A'') of their own voice output from the wired intercom system (20) in addition to their actual voice (A').

[0097] An echo cancel function may be applied to eliminate side tones. To this end, an audio processor IC chip of the audio processing unit (140) may be added to the main circuit of the relay device (100) to eliminate echo phenomena. At this time, a process of measuring the input audio level is required to ensure that the echo cancel operates properly, and a delay time must be taken into account. The design may proceed by selecting an audio processor IC chip with a Total ERLE (Echo return loss enhancement) value of 60 dB.

[0098] As such, according to one embodiment of the present invention, by using a pair of antennas with fragmentation characteristics to match the polarization of the transmitting end and the receiving end, the transmission and reception distance and the transmission and reception rate of wireless communication can be increased.

[0099] In addition, the portable transceiver included in the aircraft radio intercom system can use either a primary battery or a secondary battery, and has the function of preventing charging of the primary battery while charging the secondary battery.

[0100] Although various preferred embodiments of the present invention have been described above with some examples, the descriptions of various embodiments described in the "Specific details for carrying out the invention" section are merely illustrative, and those skilled in the art to which the present invention pertains will understand that the present invention can be modified in various ways or equivalent embodiments can be carried out based on the above description.

[0101] In addition, since the present invention can be implemented in various other forms, the present invention is not limited by the description above. The above description is provided merely to make the disclosure of the present invention complete and to fully inform those skilled in the art of the scope of the present invention, and it should be understood that the present invention is defined only by each claim of the claims.

[0102] The present invention can be used in the field of developing aviation wireless communication systems.

Claims

1. A relay device that converts a voice signal output from a wired intercom system into a digital signal and transmits it wirelessly to one or more portable transceivers, and converts a signal received wirelessly from said portable transceivers into a voice signal; and It includes the portable transceiver that converts a voice signal collected through a microphone into digital and transmits it wirelessly to the relay device, The above relay device and the above portable transceiver each include an array antenna for wireless communication between each other, and The above array antenna is, An aircraft radio intercom system configured to include a vertical antenna that responds to vertical polarization and a horizontal antenna that responds to horizontal polarization.

2. In Claim 1, The array antenna equipped in the above-mentioned portable transceiver is, One of the above vertical antenna and the above horizontal antenna is configured to be provided outside the portable transceiver and the other is provided inside. Aircraft radio intercom system.

3. In claim 2, the vertical antenna and the horizontal antenna are, Configured to be arranged so that the angle between them is 90 degrees in space, Aircraft radio intercom system.

4. In claim 1, the portable transceiver is, Includes a power supply unit, The above power supply unit includes a battery socket in which a battery is installed; A charging / discharging unit capable of discharging the battery and, if the battery is a secondary battery, charging the battery; and An aircraft radio intercom system configured to include a power control unit that controls the charging process and the discharging process of the above-mentioned charging and discharging unit.

5. In claim 4, the power supply unit, It further includes a display unit indicating whether the battery mounted in the battery socket is a primary battery that cannot be recharged or a secondary battery that can be recharged. The above power control unit is, An aircraft wireless intercom system characterized by determining whether the battery is a primary battery or a secondary battery using at least one of the internal resistance, discharge characteristics, voltage characteristics, and current characteristics of the battery.

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