JPH0553409B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of receiving multiple frequencies by a wireless communication device, and particularly relates to a method of receiving multiple frequencies when there are two priority frequencies.

[Prior Art and its Problems] Conventionally, there have been many wireless communication devices that have a so-called "priority function" that can alternately receive two waves, a single priority frequency and an arbitrary frequency, at a fixed time ratio. For example, it is disclosed in JP-A-50-137415 and JP-A-55-33358. Also,
A system that receives a plurality of priority frequencies including two priority frequencies at a fixed time ratio, and if a signal enters one of the priority frequencies, that frequency is continuously received, that is, priority of the two waves mentioned above. In some cases, the priority between frequencies was ignored and only one of the priority frequencies was in the receiving state.

However, in ship communications, in addition to arbitrary frequencies used for communication between ships and between ships and the ground, there are two priority frequencies of ch16 and ch13 in international VHF, and there are two priority frequencies between these priority frequencies. Priority varies depending on the area in which the vessel is sailing. Furthermore, in aviation radio, there are multiple priority frequencies such as aircraft-to-airport ground control, aircraft-to-air traffic control, and company radio, and the priority among these multiple frequencies also depends on the situation of the aircraft's airspace. It's different. Regarding reception of such multiple priority frequencies, for example, Japanese Patent Application Laid-Open No. 53-18319
Publication No.

In such a case, the conventional wireless communication equipment described above will ignore one of the priority frequencies.
In order to receive a priority frequency that is likely to be ignored, it is necessary to switch the radio to manual operation, which is extremely troublesome.

[Means to solve the problem]

This invention was proposed in view of the above-mentioned conventional circumstances, and when there are two frequencies that must be received preferentially, one of the frequencies is not ignored, and the reception status is adjusted according to the priority. It is an object of the present invention to provide a reception method for a wireless communication device that can automatically continue reception when the highest priority frequency is received.

In order to achieve the above object, the present invention employs the following means. That is, as shown in Figure 1,
Centering on any one selected frequency, the first,
A multi-frequency reception method for a wireless communication device that receives two priority frequencies in which a second priority frequency can be received sequentially at a constant time ratio, the method comprising any one of the above.
a step F1 of receiving a frequency for a predetermined period of time; a step F2 of setting the reception frequency of the receiving circuit to a first priority frequency after the elapse of the predetermined period of time and determining whether or not the first priority frequency is sensed; Step of receiving the above arbitrary one frequency again for a predetermined period of time in response to the fact that the first priority frequency is not received.
F3, and after the predetermined time has elapsed in step F3, the receiving frequency of the receiving circuit is set to the second priority frequency,
A step F4 returns to step F1 in which it is determined whether or not the second priority frequency is detected, and if the second priority frequency is not detected, the arbitrary one frequency is received; In response to the fact that the first priority frequency is detected in step F2 for determining the presence or absence of a sensation, the first priority frequency is received, and the first priority frequency is detected.
If the priority frequency is no longer heard, return to step F3 to receive any one frequency mentioned above again.
If the first priority frequency is detected, steps F5 and F6 continue to receive the first priority frequency, and if the second priority frequency is detected in step F4, the second priority frequency is received. A step F7 in which the frequency is received for a predetermined period of time, and a judgment is made as to whether or not the first priority frequency has been detected after the predetermined period of time in step F7, and if the first priority frequency has not been detected, the second priority frequency is received again. In step F8, which returns to step F4 to determine whether or not there is a sensation, and in step F8 above,
In response to the presence of the first priority frequency, the first
When the priority frequency is received and the first priority frequency is no longer felt, the process returns to step F4 in which it is again determined whether or not the second priority frequency is felt, and the first priority frequency is sensed. In this case, steps F9 and F10 for successively receiving the first priority frequency are performed.

Incidentally, in the above steps F5 and F6, if the first priority frequency is no longer felt, it is also possible to return to step F1 in which the above arbitrary one frequency is received again.

This creates a state in which the two priority frequencies can be received alternately while receiving a signal of any one frequency, so that one of the two priority frequencies is not ignored, and reception is performed according to the priority order. can do.

In addition, even while receiving the signal of the second priority frequency, which has a lower priority, the signal of the first priority frequency, which has a higher priority, can be received, so there is no risk of missing the signal of the first priority frequency. .

In particular, even while receiving a signal of any one frequency mentioned above,
Even in reception of the second priority frequency, when reception of the first priority frequency begins at a predetermined time interval, that reception is automatically continued with priority.

〔Example〕

FIG. 1 is a flowchart showing the operation of the channel control circuit 3 described below when the channel control circuit 3 is a CPU, and FIG. 2 is a timing chart showing the reception state controlled by the channel control circuit 3. FIG. 3 shows a circuit for implementing the invention.

First, to simplify the explanation of the circuit shown in FIG. 3, the signal received by the receiving circuit 1 is inputted to the signal detection circuit 2, where noise is removed and the received signal is taken out and inputted to the channel control circuit 3. Ru. As will be explained in detail below, this channel control circuit 3 instructs the receiving frequency of the receiving circuit 1, and also instructs the receiving time depending on the state of sensation at that time. Although it is advantageous to use a CPU as the channel control circuit 3 in terms of simplifying the circuit configuration, it goes without saying that the object of the present invention can also be achieved with a hardware circuit having the same function. The reception frequency control circuit 4 is designed to control the reception frequency of the reception circuit 1 based on the data output from the channel control circuit 3.

The operation of the channel control circuit 3 when a CPU is used as the channel control circuit 3 in such a circuit configuration will be described below with reference to FIG.

First, press the automatic reception control key (not shown).
When turned ON, the program starts and sets the receiving frequency of receiving circuit 1 so that it can receive any one frequency C (F1). After a predetermined period of time has elapsed, the receiving frequency of the receiving circuit 1 is set to the first priority frequency A, and it is determined whether a signal of the first priority frequency A is being received (F2). When the signal of the first priority frequency is not received (F2: NO), any one frequency C is received again for a certain period of time (F3). Next, the receiving frequency of the receiving circuit 1 is set to the second priority frequency B, and when the signal of the second priority frequency is not received (F4: NO), the process returns to the above step F1 again and selects the desired frequency. It becomes possible to receive frequency C for a certain period of time. This state is shown in a timing chart as shown in FIG. 2a. That is, an arbitrary frequency C is kept in a receiving state, and signals of the first priority frequency A and the second priority frequency B are made to be in a receivable state alternately.

When the signal of the first priority frequency is detected in step F2 above (F2: YES), the reception of the signal of the first priority frequency continues (F5), and when the signal of the first priority frequency disappears, the signal of the first priority frequency is received again. Returning to step F3, reception of an arbitrary frequency C is performed for a certain period of time (F6→F3). At this time, when the first priority frequency is no longer felt, it is possible to return to step F1 instead of step F3, and in that case, the first priority frequency may be returned to after a predetermined period of time has elapsed. Since step F2 is performed to determine whether or not the first priority frequency is sensed, the priority of the first priority frequency is higher than the second priority frequency described below. This state is shown in a timing chart as shown in FIG. 2b. In other words, when there is a signal of the first priority frequency A, the signal of the first priority frequency A continues to be received (F6: YES
→F5).

Furthermore, in step F4 above, the second priority frequency B
When the signal is being sensed (F4: YES), the corresponding second
A signal of the priority frequency is received for a certain period of time (F7), and then it is determined whether there is a signal of the first priority frequency (F8). If the signal of the first priority frequency A is not being sensed here, the process returns to step (F4) again.
Further, when it is determined in step F8 that the signal of the first priority frequency is being received (F8: YES), the reception of the signal of the first priority frequency A continues, and the signal of the first priority frequency A is received.
When the signal of priority frequency A disappears (F9:
F10), the process returns to step F4 and it is determined whether or not there is a signal of the second priority frequency. An example of this state is shown in a timing chart as shown in FIG. 2c. In other words, even when the second priority frequency B is being received, the first priority frequency A can be received at regular intervals, and when a signal is detected on the first priority frequency A, the first priority frequency A is immediately received. 1 priority frequency A is received.

〔Effect of the invention〕

As explained above, the present invention creates a state in which when it is necessary to receive two priority frequencies, the first priority frequency and the second priority frequency can be received at predetermined intervals even during arbitrary frequency reception. , even while receiving the signal of the second priority frequency, it is assumed that the first priority frequency can be received at fixed time intervals. In reception as well, when reception of the first priority frequency begins at a predetermined time interval, that reception automatically continues with priority.For example, the two waves of ch16 and ch13 of international VHF on a ship mentioned above This has the remarkable effect of ensuring that the most important priority frequency can be automatically and continuously captured without any manual operation when the priority frequency of the aircraft is changed or the priority order is changed depending on the aircraft's airspace or the like.

[Brief explanation of the drawing]

FIG. 1 is a flowchart showing one embodiment of the present invention, FIG. 2 is a timing chart showing the time ratio of reception frequencies based on the above flowchart, and FIG. 3 is a block diagram showing a circuit for implementing the invention. It is a diagram. In the figure, A: first priority frequency, B: second priority frequency, C: arbitrary frequency.

Claims (1)

[Scope of Claims] 1. A plurality of frequencies of a wireless communication device that receives two priority frequencies in which the first and second priority frequencies can be sequentially received at a fixed time ratio centered on any one selected frequency. The receiving method includes a step F1 of receiving the above-mentioned arbitrary one frequency for a predetermined time, and after the elapse of the above-mentioned predetermined time, setting the reception frequency of the receiving circuit to a first priority frequency, and determining whether or not the first priority frequency is sensed. a step F2 for making a judgment; a step F3 for receiving the above arbitrary frequency again for a predetermined period of time in response to the fact that the first priority frequency is not detected in the above step F2; and a receiving circuit after the predetermined time has elapsed in the above step F3 A step of returning to step F1 of setting the reception frequency of the second priority frequency as a second priority frequency, determining whether or not the second priority frequency is being sensed, and receiving the above-mentioned arbitrary one frequency if the second priority frequency is not being sensed. On the other hand, in response to the fact that the first priority frequency is detected in step F2 for determining whether or not the first priority frequency is sensed, the first priority frequency is received, and the first priority frequency is received. If the sensation is no longer felt, the process returns to step F3 to receive the above-mentioned arbitrary one frequency, and if the sensation of the first priority frequency is detected, the process continues to steps F5 and F6 to receive the first priority frequency, and , in response to the fact that the second priority frequency is detected in step F4, a step F7 of receiving the second priority frequency for a predetermined period of time, and determining whether or not the first priority frequency is detected after the predetermined time in step F7. If the first priority frequency is not sensed, step F8 returns to step F4 in which it is again determined whether or not the second priority frequency is sensed.
In step F8, the first priority frequency is received in response to the fact that the first priority frequency is sensed, and when the sense of the first priority frequency is no longer felt, the second priority frequency is transmitted again. The wireless communication device is characterized in that the process returns to step F4 to determine whether or not the first priority frequency is detected, and if the first priority frequency is detected, steps F9 and F10 are performed to continue receiving the first priority frequency. Multiple frequency reception method. 2. Wireless communication according to claim 1, wherein in steps F5 and F6, if the first priority frequency is no longer heard, the process returns to step F1 of receiving the arbitrary one frequency again. How the device receives multiple frequencies.