JPH0526786A - Communication test device - Google Patents

Abstract

PURPOSE:To test simultaneously a multitude of cordless telephones and the like for communicating with a low power wave at shorter distance than the actual communication distance. CONSTITUTION:In electromagnetically shielded boxes 1 and 2, a portable unit 5 and a fixed unit 7 of cordless phone are placed. Radio wave from an antenna 9 is received at the antenna tip 14 of an antenna device 11 and re-emitted from the antenna tip 15 of an antenna device 12 connected with coaxial cables 16 or the like to transmit to an antenna 10. The amplitude of the received radio wave at the antenna device and the re-emitted radio wave is controlled by controlling the length of antenna tip in the shielded box with a control nob 13. The radio wave from the antenna 10 is transmitted through the opposite root to the above. The shielded boxes are electrically connected through the bottom plate 3, etc., at connection parts 19 and the two shielded boxes, etc., are electromagnetically shielded by an electromagnetically shielded box 17 and its bottom plate 18. The components put inside are operated by power source, for example, battery and the like. The operation buttons of the components are operated by air cylinder using compressed air.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a call test device, and more particularly to a device for testing a call function of a device for transmitting and receiving a call signal or the like by radio waves.

[0002]

2. Description of the Related Art In devices that transmit and receive voice signals and the like using radio waves of low power, for example, stationary devices and portable devices of cordless phones, the output power value is limited, so that the callable distance is restricted. .. The manufacturer of the device conducts a test to confirm whether it satisfies the specifications such as the call distance set as the performance of the device.Since this test is to confirm the performance of the device. For example, in the case of a call distance test, the test is performed by placing a fixed device and a portable device at a distance defined by specifications or a distance interval obtained by adding a required value thereto. However, since this test uses a medium of radio waves to transmit and receive signals, it is likely that there will be confusing radio waves that are difficult to distinguish from the radio waves that are transmitted or received, or that there are multiple devices that emit similar radio waves in the same area. If performed in a remote location, the influence of these radio waves may cause incorrect judgment of the device performance. So, for example,
It is necessary to exclude from the test area devices that may cause erroneous judgments, and to perform tests by operating only the devices under test, etc., and a vast area is required to test many devices. And

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and two devices, which emit radio waves to each other and receive the radio waves, are placed in an electromagnetic wave shielding means, and one of the two devices is placed. Providing means for appropriately attenuating radio waves radiated from a device and connecting to the other device, and further electromagnetically shielding these electromagnetic wave shielding means and connecting means, whereby
(EN) Provided is a call test apparatus in which two devices forming a pair are placed at a relatively short distance and a call test is not hindered even when another pair is in the vicinity.

[0004]

In order to solve the above problems, the present invention provides a first electromagnetic wave shielding means for electromagnetically shielding a first device that emits or receives a radio wave, and the first device. Second electromagnetic wave shielding means for electromagnetically shielding the second device that receives the radio wave of the above or emits the radio wave to the first device, and the first electromagnetic wave shielding means and the second electromagnetic wave shielding means between the first electromagnetic wave shielding means and the second electromagnetic wave shielding means. Connection means for connecting via an antenna device that receives a radio wave from the device or the second device and re-radiates it toward the second device or the first device; and the first electromagnetic wave shielding means, the second electromagnetic wave shielding means and the connecting means. Provided is a call test device including a third electromagnetic wave shielding means for electromagnetically shielding.

[0005]

With the above construction, in the speech test apparatus according to the present invention, the respective radio waves radiated from the devices mounted in the two electromagnetic wave shielding means are received by the antenna device, and the radio waves are It is re-radiated from another antenna device and propagates to the other device. Since these two electromagnetic wave shielding means, the antenna device and the like are further electromagnetically shielded, it is possible to reduce the influence of signals and the like from other communication test equipment or high frequency equipment.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a speech test apparatus according to the present invention will be described in detail below with reference to the drawings. FIG. 1 is a cross-sectional view of essential parts of an embodiment of a call test device according to the present invention. In the figure, reference numerals 1 and 2 denote electromagnetic wave shielding boxes, which are connected to the floor surface portions 3 and 4 via connecting portions 19, respectively, to electromagnetically shield the equipment placed inside. Reference numeral 5 denotes a cordless telephone portable device, which is placed at a predetermined position on the placing table 6. A cordless telephone stationary machine 7 is mounted on a mounting table 8 at a predetermined position. The mounting table 6 and the mounting table 8 are respectively fixed to the floor surface portion 3 and the floor surface portion 4 of the electromagnetic wave shielding box. Reference numeral 9 is an antenna of the portable device 5, and 10 is an antenna of the stationary device 7, which radiates or receives a required high frequency signal. 11 and 12
Is an antenna device, the antenna end 14 and the antenna end 15 are projected into the electromagnetic wave shielding box 1 and the electromagnetic wave shielding box 2, respectively, and the protrusion length of the antenna end in the electromagnetic wave shielding box is changed by operating the adjusting knob 13. The amount of radio waves received from the antenna 9 or the antenna 10 is adjusted appropriately. And transmitted to the other antenna device via the coaxial cable 16 etc.,
The projection length is varied by operating the adjustment knob to re-radiate the electromagnetic wave into the electromagnetic wave shielding box 2 or the electromagnetic wave shielding box 1 from the antenna end 15 or 14 which adjusts the amount of radio wave radiation. 17
Is an electromagnetic wave shielding box, which is connected to the bottom surface portion 18 via a connecting portion 19 and electromagnetically shields the electromagnetic wave shielding box and the like and the antenna device 11 and the like.

FIG. 2 is a detailed sectional view of the electromagnetic wave shielding box 1.
Is a power supply for operating the portable device 5 and the like. Reference numeral 22 is an air cylinder or the like, and the tip portion is operated by compressed air or the like based on a required operation sent through the pipe 23, and the operation button 24 or the like of the portable device 5 is pressed. The other reference numerals are the same as those in FIG. The electromagnetic wave shielding box 2 is similar to the electromagnetic wave shielding box 1.

Next, the operation of the call test apparatus according to the present invention will be described. A portable device 6 and a stationary device 7 of a cordless telephone for conducting a call test are placed on the mounting table 6 and the mounting table 8 fixed to the floor surface portion 3 and the floor surface portion 4, respectively, at predetermined positions, and electromagnetic waves are generated by a required operation. Shielding box 1 and electromagnetic wave shielding box 2
And electrically connected via the connecting portion 19. The floor surface portion 3 and the floor surface portion 4 are integrated with the floor surface portion 18 via an insulator, and the electromagnetic wave shielding box 1 and the electromagnetic wave shielding box 2 are integrated with the electromagnetic wave shielding box 17 via an insulator. By the above operation, each floor surface portion and each electromagnetic wave shielding box are electrically connected at the connecting portion 19. In addition,
The floor portion 18 is grounded to the ground. FIG. 3 is an enlarged cross-sectional view of the main part of the connecting portion 19, where the end 31 of the electromagnetic wave shielding box is the end of the floor surface.
It is fitted into the groove 32 and is sandwiched by the leaf springs 33 provided at this time, thereby preventing leakage of electromagnetic waves at the connecting portion 19.

To prevent the electric waves transmitted inside the electromagnetic wave shielding box 1 or the like from leaking to the outside or leaking anything other than the electric wave from the antenna end 14 or the like into the electromagnetic wave shielding box 1 or the like, The power source 21 for operating the machine 5 and the stationary machine 7 is configured so as not to be electromagnetically connected to the outside of the electromagnetic wave shielding box 1 or the like, for example, a rechargeable battery or the like is used. In addition, the operation buttons (dial buttons, etc.) of the portable device 5 or the stationary device 7 pass, for example, electromagnetic waves that may interfere with radio waves used for testing equipment provided on the floor surface 3 and the like and the floor surface 18. A hole sized not to be opened is opened, and the air cylinder 22 is moved by the compressed air sent by the required pipe 23 through this hole, so that the button can be remotely pressed. If the size of the hole is insufficient, in order to prevent electromagnetic waves from passing through even if the hole is enlarged, for example, insert a filter made of thread-shaped metal inside the pipe to block the passage of electromagnetic waves. To do. Further, remote operation of the operation buttons, etc., for example, by incorporating a program for operation into a small computer,
Operate by operating this computer. Note that the sound input to the transmitter or the sound output from the receiver is transmitted / received through a pipe that passes through the same hole as the pipe for sending the compressed air, or the sound from the receiver is picked up by a microphone, and It may be amplified, converted into light, and transmitted to the outside of the electromagnetic wave shielding box via the optical fiber (sound to the transmitter is also converted into light and transmitted).

Radio waves radiated from the antenna 10 of the stationary device 7 by the above remote operation are caught by the antenna end 15 of the antenna device 12, transmitted to the antenna device 11 via the coaxial cable 16, and re-radiated from the antenna end 14. It propagates to the antenna 9 of the portable device 5. The radio wave radiated from the antenna 9 of the portable device 5 is transmitted in the opposite manner to the above and propagates to the antenna 10 of the stationary device 7. When the portable device 5 and the stationary device 7 are in a large space, the amount of propagation of the electromagnetic wave determined by the amount of received waves and the amount of re-radiation of the antenna device 11 and the antenna device 12 is the amount of electromagnetic waves radiated from the antenna 10 of the stationary device 7. Is set so as to match the level of the signal propagating to the antenna 9 of the portable device 5 placed at the position defined by the specifications and output from the portable device 5, and the antenna device is provided on the side of one electromagnetic wave shielding box. Since the propagation amount of the radio wave may be too large or the size of the radio wave may be difficult to stabilize only by adjusting the reception amount and the re-radiation amount of the radio wave by providing the above, the electromagnetic wave shielding box is provided on both sides. The setting of the propagation amount of the radio wave is performed, for example, by placing a fixed device and a portable device whose communication distance is checked in advance in a required space such as outdoors at the required positions in the electromagnetic shielding box and receiving the radio wave. The amount is set by operating the adjustment knobs 13 of the antenna device 11 and the antenna device 12 so that the amount becomes the same level on both sides, and the set amount is regularly calibrated. Then, the antenna end 14 and the antenna 9 or the antenna end 15 in the electromagnetic wave shielding box
The respective distances of the antenna and the antenna 10 are appropriately set so that when the radio waves radiated by both devices are received by the other device, signals of the same level are output. This makes it possible to obtain the same test results as in the case where, for example, a stationary device and a portable device are separated by 200 meters and tested in a space free from interference waves.

FIG. 3 is a cross-sectional view of an essential part of an example of the antenna device 11. When the adjustment knob 13 is rotated as indicated by arrow a, the metal cylinder 42 slides in the direction of arrow b. Coaxial cable 16 with fixed part 43 composed of an insulator
The antenna end (14) connected to the core wire appears and disappears in the electromagnetic wave shielding box to increase or decrease the amount of received radio waves or the amount of reradiated radio waves. Note that, in this antenna device, the amount of transmission of radio waves may be adjusted by a variable attenuator for high frequency without changing the protruding length of the antenna end.

[0012]

As described above, according to the call test apparatus of the present invention, the radio wave radiated from the antenna of the fixed device or the portable device of the cordless telephone receives and re-radiates this radio wave. And is propagated to the antenna of the portable device or the stationary device only via the coaxial cable, and the amount of propagation is adjusted by the adjustment knob of the antenna device. Then, radio waves from other high-frequency devices existing around these stationary devices or portable devices are shielded by an electromagnetic wave shielding box.
Therefore, for example, when performing a test, a fixed machine and a portable machine can be placed close to each other, and even if a plurality of these devices under test are placed close to each other, the test result can be erroneously judged. There is no. In this call test device, since the amount of propagation of radio waves can be arbitrarily adjusted as described above, the call test device can be easily applied to tests of devices having different output power levels. Also, if button operations etc. are automatically operated remotely based on a program installed in the computer,
For example, it is possible to test a plurality of groups in a factory with a small number of people at the same time, and productivity can be improved.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of an embodiment of a call test device according to the present invention.

FIG. 2 is a detailed cross-sectional view of the essential parts of an embodiment of the call testing device according to the present invention.

FIG. 3 is a partial cross-sectional view for explaining electromagnetic shielding of the call test device according to the present invention.

FIG. 4 is a cross-sectional view of an essential part of the antenna device of the call test device according to the present invention.

[Explanation of symbols]

 1 Electromagnetic wave shielding box 2 Electromagnetic wave shielding box 3 Floor surface 4 Floor surface 5 Mobile device for cordless phone 7 Stationary device for cordless phone 9 Antenna 10 Antenna 11 Antenna device 12 Antenna device 13 Adjustment knob 14 Antenna end 15 Antenna end 16 Coaxial cable 17 Electromagnetic wave Shield box 18 Floor part 19 Connecting part

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Terumi Sugawara 1116 Suenaga, Takatsu-ku, Kawasaki City Within Fujitsu General Limited

Claims (1)

Claim: What is claimed is: 1. A first electromagnetic wave shielding means for electromagnetically shielding a first device that emits or receives a radio wave, and the first device.
Second electromagnetic wave shielding means for electromagnetically shielding a second device that receives a radio wave from the device or emits a radio wave to the first device, and the first electromagnetic wave shielding means and the second electromagnetic wave shielding means between the second electromagnetic wave shielding means and the second electromagnetic wave shielding means. Connection means for connecting via an antenna device that receives a radio wave from the first device or the second device and re-radiates it toward the second device or the first device; and the first electromagnetic wave shielding device,
A call test apparatus comprising a second electromagnetic wave shielding means and a third electromagnetic wave shielding means for electromagnetically shielding the connecting means.