JPS60233949A - Radio communication system - Google Patents

Abstract

PURPOSE:To avoid inconvenience that the test using a test signal gives a good result while the operation using a control signal shows a fault by using a signal equal to the control signal but opposite in the order of transmission as the test signal. CONSTITUTION:A transmitter side is provided with a tone oscillator 3-1 oscillating a frequency f1 and an oscllator 3-2 oscillating a frequency f2 and when a control signal transmission switch 1 is turned on, the said tone frequencies are transmitted in the order of the f1 and f2 from a transmission section 4. In case of the test, the order of transmission is reversed and the frequencies are transmitted in the order of the f2 and f1. Detection sections 6-1, 6-2 provided to the receiver side detect each transmitted tone frequency and gives an output to a discriminating circuit 7. The discriminating circuit 7 discriminates whether the order of transmission is f1, f2 or f2, f1, and in case of the former order, a control signal is outputted from an output circuit 8. Further, when the order is f2, f1, after the test signal is detected and no test signal is detected within the set time of a timer 9, then it is discriminated as a fault and an alarm signal is outputted from an output circuit 10.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a wireless communication system, and more particularly to a system for testing operations between a transmitting device and a receiving device that perform wireless communication via a wireless line.

Description of the Prior Art In wireless communication, in which a tone frequency is sent as a control signal from a transmitting device to a receiving device, and the receiving device detects this tone frequency to control equipment inside or outside the receiving device, the reliability of one communication is evaluated. In order to improve the quality of our products, we regularly or irregularly conduct functional tests on transmitting equipment and receiving equipment, other than when supplying operational supplies.

However, conventional tests have been conducted using a test signal frequency separate from the control signal frequency.

In this case as well, the test signal frequency and control signal frequency are not the same, so the test using the test signal frequency is rated 1.
However, it is conceivable that operation using the control signal frequency is ``defective.''

FIG. 1 is a block diagram showing an example of the configuration of this type of system according to the prior art. As shown in Figure 1.

The transmitting device includes an oscillation circuit (3-1) and an oscillation circuit (3-2) that oscillate control signal frequencies f+ and fz, and an oscillation circuit (3-3) and an oscillation circuit that oscillate control signal frequencies fs and f4, respectively. (3-4) and control signal frequency f1. f! a switch 1 for starting the oscillation circuit (3-1) and a drive circuit (3-2) for driving the oscillation circuit (3-1) and the oscillation circuit (3-2) according to the start input of the switch 1;
2-1) And the period of the set time T+ and the time T
1, the time is short enough! The oscillation circuit (3-3) and the oscillation circuit (3-4) transmit the test signal frequencies is and fa at
a drive circuit (2-2) that drives the oscillation circuit (2-2), a gate circuit (11-1) for prohibiting oscillation of the oscillation circuit (3-3) and the oscillation circuit (3-4) when switch 1 is activated; It has a transmitting unit 4 that transmits signal frequencies f1 to f4 of the circuit (11-2) and the oscillation circuits (3-1 to 3-4) to a wireless line, and the receiving device has a signal frequency f1 to f4 of the oscillation circuit (3-1 to 3-4). a receiving section 5 that receives the signal frequency f+-fa;
A detection circuit (6-1), a detection circuit (6-2), a detection circuit (
6-3), detection circuit (6-4), and detection circuit (6-1)
and a determination circuit (7-1) that is connected to the output of the detection circuit (6-2) and determines whether the signal frequency transmitted via the wireless line is the control signal frequency fs or fg;
-1) and outputs a control signal to the outside of the device according to the output of the determination circuit (7-1), and a detection circuit (6-1).
-3) and the signal frequency connected to the output of the detection circuit (6-4) and transmitted via the wireless line is the test signal frequency f*,
It is connected to the judgment circuit (7-2) that judges whether fa or not and the 1 judgment circuit (7-2), and checks whether the output of the judgment circuit (7-2) is again at a sufficiently long time T than time T1. It has a timer circuit 9 for checking, and an output circuit 10 connected to the timer circuit 9 and outputting an e-miscellaneous signal by the output of the timer circuit 9 if the test signal frequencies fx and f4 are not present again at time T1.

As mentioned above, conventionally, the control signal frequency fI,
Since fx and test signal frequencies Ls and f4 are not the same,
Each detection circuit and judgment circuit are separate blocks, and a problem occurs in which the test using the test signal frequencies ft and f4 yields 1 "good" but the operation using the control signal frequencies ft and ft yields 1 "fail". There is.

Purpose of the Invention The present invention has been made in view of the above-mentioned conventional circumstances).
Therefore, an object of the present invention is to transmit tone frequencies as control signal frequencies in the fs order, and to transmit tone frequencies as test signal frequencies in the JIB order of fx and ft, and to use the same detection circuit and the same The object of the present invention is to provide a new wireless communication device that solves the above drawbacks by using a determination circuit.

Structure of the Invention In order to achieve the above object, a wireless communication system according to the present invention includes at least two tone oscillation circuits, that is, a first tone frequency signal, in a transmitting device and a receiving device that perform wireless communication via a wireless line. a first oscillation circuit that oscillates, a second oscillation circuit that oscillates a second tone frequency signal, a switch that sets the sending order of the first tone frequency signal and the second tone frequency signal; The first tone frequency signal and the second tone frequency signal are arranged in the order of 1% second tone frequency in a second time period that is sufficiently shorter than the first time period in a set first time period. and when the switch is activated, the first
The tone frequency signal of the first . a drive circuit that drives a second tone oscillation circuit; and a transmitter that transmits the first and second tone frequency outputs of the first tone oscillation circuit and the second tone oscillation circuit to a wireless line. a transmitter, a receiver that receives the first tone frequency and the second tone frequency transmitted from the transmitter via a wireless line; and a receiver connected to the receiver and received by the receiver. a first detection circuit that detects the first tone frequency signal; a second detection circuit that is connected to the receiver and detects the second tone frequency signal received by the receiver; the first tone frequency signal connected to the output of the detection circuit and the output of the second detection circuit and transmitted at the second time;
The detection order of the tone frequency signals is 1st. a determination circuit that determines whether the tone frequency is the second tone frequency or the second tone frequency or the first tone frequency;
．． an output circuit that outputs a control signal when the determination circuit determines that the tone frequency is a second tone frequency; and an output circuit that is connected to the determination circuit and determines that the detection order is the second tone frequency and the first tone frequency. At a third time, which is sufficiently longer than the first time, the determination circuit again determines that the detection order is second. a timer circuit for determining whether the tone frequency is the first tone frequency; and a timer circuit connected to the timer circuit for determining whether the tone frequency is the first tone frequency; and an output circuit for outputting an alarm signal according to the output of the timer circuit if the first tone frequency is not present again.

3. Detailed Description of the Invention Next, a preferred embodiment of the present invention will be specifically described with reference to the drawings.

FIG. 2 is a block diagram showing an embodiment of the present invention. Referring to FIG. 2, the transmitting device has a tone frequency fs
, fx (3-1).

An oscillation circuit (3-2), a switch l for starting the control signal frequency ft, h, and a preset time T connected to the oscillation circuit (3-1) and the oscillation circuit (3-2).
The oscillation circuit (
3-1), an oscillation circuit (3-1) that drives the oscillation circuit (3-2), and transmits tone frequencies in the order of fs and fs by input from switch 1 when switch 1 is operated; Drive circuit 2 that drives the oscillation circuit (3-2)
, an oscillation circuit (a-1), and a transmitter 4 connected to the oscillation circuit (3-2) and transmitting tone frequencies f+ and fx to a wireless line.

The receiving device includes a receiving section 5 that receives tone frequencies fs and fx received via a wireless line, and a receiving section 5 connected to the output of this receiving section 5 to receive the received tone frequencies.

A detection circuit (6-1) that detects fx, a detection circuit (6-2)
)and.

The detection order of the tone frequencies f1 and fx connected to the outputs of the detection circuit (6-1) and the detection circuit (6-2) and detected at time T2 is controlled by the signal frequency, fs, test signal frequency h, and a determination circuit 7 that determines whether it is fI.

an output circuit 8 which is connected to the determination circuit 7 and outputs a control signal when the determination circuit 7 determines that the tone frequency fx is detected in the control signal frequency fx, f*;
The determination circuit 7 determines that the detection order of the tone frequencies f1 and fx is the test frequencies fx, f+, and the time T
A timer circuit 9 is connected to the output of the timer circuit 9 and checks whether the output of the determination circuit 7 is present at a sufficiently long time T3, and the test signal frequency fs is connected to the output of the timer circuit 9 again within a time T1. , ft, an output circuit 10 outputs an alarm signal based on the output of the timer circuit 9.

Effects of the Invention As explained above, the present invention provides a control signal frequency and a test signal frequency by setting the tone frequencies fx, f*, and fx, which are the tone frequencies whose transmission order is reversed, so that the control signal frequency and the test signal frequency can be used during operation and during testing. Sometimes the same detection circuit.

By using the same determination circuit, it is possible to reliably detect a malfunction in the device through a single functional test.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an example of a conventional configuration, and FIG. 2 is a block diagram showing an embodiment of the present invention. 1... Switch, 2... Drive circuit, 2-1... Drive circuit. 2-2... Drive circuit, 3-1... Oscillation circuit, 3-2
...Oscillation circuit, 3-3...Oscillation circuit, 3-4...
Oscillation circuit, 4... Transmitting section, 5... Receiving section, 6-1.
...Detection circuit, 6-2...Detection circuit, 6-3...Detection circuit, 6-4...Detection circuit, 7...Judgment circuit, 7
-1... Judgment circuit, 7-2... Judgment circuit, 8...
Output circuit, 9...Timer circuit, 10...Output circuit Patent applicant NEC Corporation Representative Patent attorney Kuma, Yutabe Tani Figure 1 Figure 2

Claims (1)

[Claims] A transmitting device and a receiving device that perform wireless communication via a wireless line include at least two tone oscillation circuits, namely, a first oscillation circuit that oscillates a first tone frequency signal and a second oscillation circuit that oscillates a 1M2 tone frequency signal. a circuit, and the first
a switch for setting the sending order of the tone frequency signal and the second tone frequency signal; and a switch for setting the sending order of the tone frequency signal and the second tone frequency signal; The second time is sufficiently shorter than the first time. When the switch is operated, the first tone frequency signal and the second tone frequency signal are sequentially transmitted in the second tone frequency order. the first tone frequency to be the first tone frequency.
, a drive circuit for driving the second tone oscillation circuit, and a drive circuit for driving the first tone oscillation circuit and the second tone oscillation circuit.
a transmitting device having a transmitting unit that transmits the 1% second tone frequency output to a wireless line; and the first tone frequency and the second tone transmitted from the picture sending device via the wireless line. a first detection circuit that is connected to the receiver and detects the signal of the first tone frequency received by the receiver; a second detection circuit for detecting the received second tone frequency signal; and a second detection circuit connected to the output of the first detection circuit and the output of the second detection circuit to detect the second tone frequency signal transmitted at the second time. Whether the detection order of the first tone frequency signal and the second tone frequency signal is the first tone frequency, the second tone frequency signal, or the second tone frequency signal. a determination circuit that determines whether the tone frequency is the first tone frequency; and an output circuit that is connected to the cough determination circuit and outputs a control signal when the determination circuit determines that the detection order is the first or second tone frequency. , which is connected to the determination circuit and whose detection order is second. The determination circuit determines that the tone frequency is the first tone frequency, and the third tone frequency is determined to be the third tone frequency which is sufficiently longer than the first tone frequency.
a timer circuit connected to the timer circuit and configured to confirm whether the determination circuit again determines that the detection order is the second and first tone frequencies at the third time; 1st
1. A wireless communication system comprising: a receiver having an output circuit that outputs an alarm signal when the tone frequency is not present again by the output of the timer circuit;