JPH07170224A - Interphone system for aircraft - Google Patents

Abstract

PURPOSE:To issue an alarm before an airplane takes off even when the detachment of a ship terminal for radio fitted near the front leg of the airplane is forgotten by generating an alarm beam and/or an alarm sound when a radio wave to be received on the side of the ship terminal for radio gets lower than a specified value. CONSTITUTION:When a power source at a reception part 51 of a ship terminal master unit 5 for radio is turned on, based on an allocated frequency signal supplied from a control part 53, currents supplied from an antenna part are successively received, and an idle channel is searched. This idle channel becomes a communication channel to be used for voice communication. The alarm generating part of the reception part 51 is provided with a monitor circuit for received radio waves and when the intensity of radio waves generated from a portable radio slave unit gets lower than the specified value, an alarm generate signal is supplied to an alarm sound generating circuit and an alarm beam generating circuit. The alarm generating part receives the alarm generation instruct signal, turns on the alarm light and transmits the alarm sound signal through the control circuit 53 to the interphone system for the airplane.

Description

Detailed Description of the Invention

[0001]

The present invention relates to an occupant of an aircraft,
The present invention relates to an intercom wireless transmission / reception system for aircraft used for communication between engineered mechanics and the like in the vicinity.

[0002]

2. Description of the Related Art An intercom system in an aircraft is used for voice communication with the outside of an aircraft such as an air traffic controller, an identification signal of a radio navigation facility coming from outside the aircraft, a call with a flight attendant, and with a ground mechanic. Responsible for communication. Of these, the flight intercom is used to communicate with ground crews and crew members at the tarmac. Conventionally, communication with a ground mechanic has been performed by connecting a corded interphone with a long cable having a plug at one end of an existing interphone jack near the front leg of an aircraft. This [coded intercom] plug is inserted into the aircraft intercom jack. An earphone and a microphone are connected to the other end of the cable of about 10 m. However, this corded intercom can communicate only within the range of the cord length, lightning that hit the aircraft through the cord, harming mechanics, and moving the aircraft,
There was a problem such as a cord being wrapped around the front wheel and causing a personal injury.

[0003]

SUMMARY OF THE INVENTION The present invention is directed to a wireless ship terminal connected to an existing jack of an in-flight intercom system by a plug and a wireless handheld terminal. It consists of a radio. The wireless ship terminal is usually removably attached near the front legs of the aircraft, but if you forget to remove it and take off without taking it off, the front legs will be stowed inside the aircraft, and the wireless ship terminal will be caught and damage the relevant parts. May seriously affect the safety of When the maintenance staff with equipment forgets to remove the wireless ship terminal, the maintenance staff with equipment is not aware of the wireless ship terminal. The ship terminal is believed to remain connected to the aircraft's existing intercom system. On the other hand, there are two cases on the side of a portable radio that is carried by a mechanic with equipment, such as when the mechanic with equipment turns off the power and when the power is left on. Conceivable. The wireless ship terminal and the portable wireless device are duplex type wireless devices having identification codes for identifying each other. The duplex type radio has a function of constantly detecting the state of a radio wave emitted from the other side during operation. When the radio wave emitted from the other party disappears, or when the radio wave becomes weak enough to deteriorate the quality of communication, a function to automatically call the other party is provided.

According to the present invention, when the wireless ship terminal is forgotten to be removed, that is, when the wireless ship terminal is powered on and is still connected to the existing intercom system of the aircraft, it is portable. When the power of the radio is turned off, the wireless ship terminal detects that communication has been interrupted, activates the light source equipped in the wireless ship terminal, and from the wireless ship terminal via the intercom system already installed in the aircraft. Then, a warning sound is emitted to the passenger. If you forget to remove the wireless ship terminal, and the portable wireless device is still turned on, the aircraft will leave the parking area,
During the time from the taxiway to the runway, the radio waves emitted from the portable radio that is received by the wireless ship terminal are attenuated and communication is lost. The wireless ship terminal detects that communication has been interrupted, activates the light source installed in the wireless ship terminal, and sends an alarm sound to the passengers from the wireless ship terminal via the intercom system already installed in the aircraft. Emit. The wireless ship terminal and the portable wireless device used in the present invention both have a control channel and a communication channel. When the power of the wireless ship terminal or the portable wireless device is turned on, an empty channel that is not used in the vicinity is automatically detected from among the plurality of assigned communication channels, and the communication channel used by the device is determined. This channel number is transmitted via a control channel whose frequency is predetermined. Further, the wireless ship terminal and the portable wireless device are preset with identification codes for automatically selecting a partner device. This identification code is sent out together with the communication channel number used by the machine via the above-mentioned control channel. The other device that received this control channel first
The identification code is collated, and if it matches the preset code, communication is started via the automatically selected communication channel. As described above, by providing this device, it is not necessary to set the machine number and the channel number.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIGS. 1 and 2, one of a plurality of jack ends belonging to an in-flight intercom system 1 is provided near the front leg of an aircraft. In an in-flight intercom system, a headset (3-3 ') consisting of an earphone and a microphone connected to a plurality of jack ends (2, 2') via plugs by audio signals.
A conversation is held between them. The wireless ship terminal master unit 5 is attached by inserting the plug 6 into the jack 4 provided near the front leg of the aircraft. The voice signal input to the master unit 5 via the plug 6 is transmitted from the antenna as a telephone by the frequency modulation method by the transmitter in the master unit 5. The cordless handset 7 receives the transmitted radio wave, demodulates the received radio wave signal into an audio signal, and listens with the headset 8.
This communication is carried out bidirectionally from the child device 7 through the parent device 5.

As shown in FIG. 3, the wireless ship terminal base unit 5 comprises an antenna section, a receiving section 51, a transmitting section 52, a control section 53, and a plug as an aircraft connecting section. When the power is turned on, the receiving unit 51 sequentially receives the radio waves supplied from the antenna unit based on the assigned frequency signal supplied from the control unit 53, and searches for a vacant channel. This empty channel becomes a communication channel used for voice communication. The communication control unit 53 supplies the communication channel number and the registered wireless device identification code to the transmitting unit. The transmitter 52 sends out the communication channel number and the wireless device identification code from the antenna using the control channel. The portable wireless handset includes an antenna unit, a receiving unit, a transmitting unit, a control unit, and a microphone receiver unit, like the base unit.
When the power is turned on, the receiving unit demodulates the control channel and detects the radio device identification code and the communication channel number. When the identification code matches the code registered in advance, the control unit outputs the communication channel number to the transmission unit and the reception unit. The transmission unit modulates the audio signal supplied from the microphone receiver unit with the designated communication channel frequency, and sends out from the antenna unit. On the other hand, the receiving unit demodulates the voice signal of the occupant sent from the wireless ship terminal through the communication channel and supplies the demodulated voice signal to the microphone receiver unit. When communicating with aircraft occupants through the intercom wireless transmission / reception system for aircraft, the mechanic with aircraft simply connects the wireless ship terminal to the aircraft side and then powers on the wireless ship terminal and portable radio. Since the free channel is selected and the partner device is automatically identified, the communication can be started immediately. The present invention eliminates erroneous setting of machine numbers and channel numbers, eliminates the need for complicated channel number allocation work for each parking spot, and is effective in preventing interference.

The receiver 51 of the wireless ship terminal according to the present invention includes an alarm generator shown in FIG.
The alarm generation unit has a reception radio wave monitor circuit 511, and outputs an alarm generation instruction signal to the alarm sound generation circuit 512 and the alarm light generation circuit 513 when the intensity of the radio wave emitted by the portable wireless handset 7 falls below a specified value. Supply. The alarm generation unit receives the alarm generation instruction signal, turns on the alarm light, and sends the alarm sound signal to the existing intercom system of the aircraft via the control device 53. Further, this alarm sound signal may be superposed on the transmission path of the voice signal emitted from the portable wireless device demodulated by the wireless ship terminal. Since this warning sound is distinguished from the warning sound provided in the aircraft, a tone color different from the existing sound is desirable. Further, it may be a sound generated by a synthesizer or the like. It is desirable that the radio unit and the alarm generation unit are integrated, but they may be separated for manufacturing reasons or for improving the visibility of the warning light.
The alarm light and the alarm sound may be provided with only one of them. The alarm may be issued immediately after the intensity of the radio wave falls below the specified value, but for the reason of preventing an excessive alarm to the occupant, for example, 10 minutes before the alarm is issued.
It is desirable to provide a delay time of the order of seconds. The radio unit of the radio ship terminal has a function of transmitting a signal for calling the mobile radio device via the transmitter 52 when the intensity of the radio wave emitted by the mobile radio device falls below a specified value. When this signal is transmitted, an alarm generation instruction signal is supplied to the alarm generation unit. Since the signal for calling the portable radio is transmitted via a specific frequency channel, it becomes possible for a third party to detect the forgetting removal by intercepting this channel in the vicinity.

According to the present invention, by using the wireless intercom system for an aircraft equipped with the forget-to-remove alarm device, even if the user forgets to remove the wireless ship terminal mounted near the nose gear of the aircraft, an alarm is issued before the aircraft takes off. Therefore, it is possible to prevent a serious accident due to the wireless ship terminal being caught when the legs are housed in the body after takeoff and damaging the relevant part.

[Brief description of drawings]

FIG. 1 is a diagram showing a state in which the device of the present invention is attached to an aircraft.

FIG. 2 is an overall configuration diagram of the device of the present invention.

FIG. 3 is a configuration diagram of a wireless master device of the device of the present invention.

FIG. 4 is a diagram showing a configuration of an alarm generation unit in the wireless master device of the device of the present invention.

[Explanation of symbols]

 1: In-flight intercom system 5: Ship terminal wireless master device 7: Wireless slave device 511 to 513: Alarm generation unit

Claims (2)

[Claims] 1. An forget-to-remove alarm device for an intercom wireless transmission / reception system for an aircraft, which generates an alarm light when a radio wave emitted from a portable radio device and received by a radio ship terminal side falls below a prescribed value. 2. An forget-to-remove alarm device for a wireless transmission / reception system for an aircraft, which emits an alarm sound via an intercom system already installed in the aircraft when the radio wave emitted from the portable wireless device falls below a specified value.