JPH04329038A - Radio receiver - Google Patents

Abstract

PURPOSE:To allow the radio receiver able to receive one signal only at one time to monitor plural signals over a wide range apparently simultaneously in a duty ratio in response to priority. CONSTITUTION:First and 2nd reception conditions set optionally are stored in a memory, an optional duty ratio is set to the memory and a central arithmetic unit reads sequentially the 1st and 2nd reception conditions from the memory in response to the duty ratio. A local oscillation PLL frequency synthesizer is controlled in response to the read reception condition and the radio receiver is subject to changeover control sequentially into the tuning state in response to the 1st and 2nd reception conditions in the duty ratio set to an optional value repetitively. Thus the standby reception is attained in the duty ratio in response to the priority of the 1st and 2nd reception conditions.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION The present invention is a radio receiver capable of receiving only one signal at a time, which allows signals of many different frequencies and radio wave formats to be monitored simultaneously.

0002

2. Description of the Related Art In radio receivers that can receive only one signal at a time, a priority scan has conventionally been used to investigate and monitor whether or not another specific signal exists while being tuned to one signal. There is movement. Also,
A memory sequential priority scan operation is used to sequentially investigate and monitor whether or not a plurality of other specific signals are present.

[0003] This priority scan operation periodically switches from a tuned state of one signal to a tuned state of another specific signal for a very short period of time, and when that specific signal is received with an electric field strength of a predetermined level or higher, Then, the tuned state of the signal is continued. In addition, in the memory sequential priority scan operation, each time the tuned state of one signal is periodically switched to the tuned state of another specific signal for a very short period of time, the signal in this tuned state is stored in the memory. When a particular signal is sequentially selected from a plurality of signals, and is received with an electric field strength of a predetermined level or higher, the tuned state of the signal is continued.

0004

[Problems to be Solved by the Invention] The conventional priority scan operation and memory sequential priority scan operation described above use time-division control to apparently detect the presence of multiple signals simultaneously in a radio receiver that can only receive one signal at a time. It can be used for investigation and monitoring, and operates as if there were multiple wireless receivers, making it convenient for operation.

However, the time period during which the tuning state is periodically switched to another specific signal is preset, and the duty ratio cannot be arbitrarily changed or adjusted. This is inconvenient when trying to stand by and receive two signals with the same priority. That is, if the priorities are the same, it is desirable that the two signals be tuned to have the same duty ratio. Furthermore, conventional radio receivers that can only receive one signal at a time do not have a function of periodically switching from a tuned state of one signal to another frequency sweep operation. When investigating and monitoring the presence of unknown signals by frequency sweep operation, it is desirable to be able to appropriately set the duty ratio according to the priority level of the signal.

[0006] The present invention has been made in view of the circumstances of the conventional radio receiver, and is capable of adjusting to a tuned state according to two or more different reception conditions suitably set with a duty ratio set to an arbitrary value. It is an object of the present invention to provide a radio receiver that sequentially repeats switching control.

[0007]

[Means for Solving the Problems] In order to achieve the above object, the wireless receiver of the present invention includes a PLL frequency synthesizer for local oscillation, a memory for storing reception conditions, and a frequency synthesizer for local oscillation according to the reception conditions. a central processing unit that controls a PLL frequency synthesizer and is capable of receiving only one signal at a time, wherein two or more different reception conditions are stored in the memory by reception condition setting means;
The duty ratio setting means sets the duty ratio of the tuned state according to the different reception conditions to an arbitrary value, the central processing unit sequentially reads out the different reception conditions from the memory at the duty ratio, and the local oscillation The PLL frequency synthesizer for the PLL frequency synthesizer is configured to repeat switching control sequentially according to the read reception conditions.

[0008] A display means for displaying the reception condition is provided, and the display means is provided to display the reception condition in response to switching control of the local oscillation PLL frequency synthesizer in accordance with the reception condition read out by the central processing unit. The reception condition that has been read out may be displayed on the display means.

[0009] Also, while the different reception conditions are being sequentially switched, the reception condition setting means allows the main reception condition of any one of the different reception conditions to be changed, and the other reception conditions cannot be changed. It may be configured as possible.

[0010]Furthermore, the replacement operation means selects a main reception condition that can be changed among the different reception conditions.
It is also possible to configure the reception condition to be replaced with another reception condition that cannot be changed.

[0011] Furthermore, when the unchangeable reception condition is displayed on the display means, at least a part of the display may be configured to blink.

[0012] Furthermore, it may be configured such that at least one of the reception conditions set by the reception condition setting means is a frequency sweep operation.

Furthermore, when the frequency sweep operation is aborted in the middle of the frequency range set in the reception condition and switched to another reception condition, the condition at the time of the abort is stored in the memory, and the frequency of the reception condition is changed. It is also possible to configure so that when the sweep operation is restarted, the conditions stored in the memory are read out, and the frequency sweep operation is performed based on the conditions.

[0014]

[Function] Two or more different reception conditions can be set and memorized as appropriate, and the duty ratio can be set to any value, so the tuning state corresponding to the different reception conditions can be sequentially adjusted with the duty ratio according to the priority level of the reception conditions. Switching control is repeated, and standby reception is possible according to the priority level.

[0015] If one display means is switched to display the reception condition under which the radio receiver is currently tuned, the reception condition under which the radio receiver is currently tuned is always displayed.

[0016] Furthermore, while the different reception conditions are being sequentially switched and controlled, if any one of the main reception conditions can be changed and the other reception conditions cannot be changed, two or more different reception conditions can be changed. While the main reception conditions are controlled to be switched sequentially in a short cycle, there is no confusion between the main reception conditions and other reception conditions, and the main reception conditions can be easily rewritten.

Furthermore, if it is possible to replace the main reception condition with another reception condition by a replacement operation, by appropriately replacing the reception condition that requires the change operation with the main reception condition, it is possible to replace the reception condition while the switching control is repeated. All reception conditions can be rewritten without causing confusion.

[0018] Furthermore, if a part of the display is made to blink when displaying receiving conditions that cannot be changed on the display means, the blinking of the display indicates whether or not the receiving condition currently in tune is the main receiving condition. It can be easily distinguished by the presence or absence of .

Furthermore, if a frequency sweep operation is set as at least one reception condition, it is possible to investigate and monitor the presence or absence of a wider range of signals than in the conventional priority scan operation.

Furthermore, even if the frequency sweep operation is aborted in the middle of the frequency range of the reception condition, if the frequency sweep operation is performed from the aborted frequency when the reception condition is restarted, the frequency range set in the reception condition is Even if one duration of the duty ratio is shorter than the time required to sweep the frequency over the entire range of reception conditions, the frequency sweep over the entire range can be completed while the switching control is repeated.

[0021]

[Example] The following is an example of the present invention shown in FIGS. 1 to 5.
Explain with reference to. FIG. 1 is a flowchart illustrating one operation of an embodiment of the wireless receiver of the present invention,
FIG. 2 shows another example of the operation of an embodiment of the wireless receiver of the present invention.
FIG. 3 is a flowchart illustrating an example of an operation in which only the first reception condition can be changed while repeating switching control, and FIG. 5 is a flowchart illustrating an example of a replacing operation, and FIG. 5 is a block circuit diagram of an embodiment of the wireless receiver of the present invention.

First, the structure of one embodiment of the radio receiver of the present invention will be explained with reference to FIG. The signal received by the antenna 10 is given to the mixing circuit 14 via the high frequency amplification circuit 12. This mixing circuit 14 is given a local oscillation signal from a PLL frequency synthesizer 16 for local oscillation,
The signal frequency-converted to an appropriate intermediate frequency is applied to an intermediate frequency amplification circuit 18. Only the intermediate frequency signal is extracted and amplified by the intermediate frequency amplification circuit 18 and given to the demodulator 20, and the demodulated signal is amplified by the audio amplification circuit 22 and amplified from the speaker 24. PLL for local oscillation
Frequency synthesizer 16 is given frequency setting N data from central processing unit 26 . Further, the demodulator 20 is given modulation mode data from the central processing unit 26 . The central processing unit 26 includes a memory 28 for storing reception conditions, a group of operation keys 30 for arbitrarily setting these reception conditions, and one keypad for displaying reception conditions in a tuned state. Display means 32 is connected.

In such a configuration, two different reception conditions, the first reception condition and the second reception condition, can be stored in the memory 28 via the central processing unit 26 by appropriately operating the operation key group 30. , duty ratio (for example, 5:0.1, 4:0.5, 3:1, 2
:2) can be set arbitrarily. The operation key group 30 cooperates with the central processing unit 26 to
It functions as reception condition setting means when appropriately setting the second reception condition, and functions as duty ratio setting means when setting the duty ratio. Here, the first and second reception conditions that can be set arbitrarily may be one signal with any radio wave format, but each can be set as a program scan operation as a frequency sweep operation, a memory scan operation, a mode scan operation, etc. Either automatic memory write scan operation may be used.

Next, one of the operations of the radio receiver of the present invention will be explained with reference to FIG. In FIG. 1, it is assumed that one specific signal is set as the first and second reception conditions, respectively. First, in step 1, a duty ratio at which the first and second reception conditions are switched is appropriately set by operating the operation key group 30 as a duty ratio setting means. Next, in step 2, the first reception condition is appropriately set by operating the operation key group 30 as a reception condition setting means, and then in step 3
Then, the second reception condition is appropriately set by operating the operation key group 30. The order of these steps 1 to 3 may be reversed. Then, in step 4, the central processing unit 26 reads the first reception condition from the memory 28, and according to the read reception condition, the central processing unit 26 sets the local oscillation PLL frequency synthesizer 16 to an appropriate frequency setting N. At the same time as the data is provided, modulation mode data is also provided to the demodulator 20. As a result, the wireless receiver becomes tuned to the signal of the first reception condition. At the same time, the central processing unit 2
6 causes the display means 32 to display the first reception condition. Further, in step 5, the tuned state based on the first reception condition is continued for a time set by the duty ratio. When the set time has elapsed, the process switches to step 6, in which the central processing unit 26 reads out the second reception condition from the memory 28, and the central processing unit 26 reads out the second reception condition from the memory 28 according to the newly read reception condition.
6, the radio receiver becomes tuned to the signal of the second reception condition, and the second reception condition is displayed on the display means 32, and a part of the display (for example, MHz digit and K
Hz digit decimal point, etc.) is displayed blinking, indicating that the second reception condition is displayed. moreover,
In step 7, the tuned state under the second reception condition is continued for the time set by the duty ratio, and when the set time has elapsed, the process returns to step 4. In this way, the switching control according to the arbitrarily set duty ratio of the tuned state according to the first and second reception conditions is repeated.

By the way, although not explained in FIG.
By operating the stop key of the operation key group 30 during the repeated operation of the switching control of the second reception condition, the switching operation is stopped, and the tuned state according to the reception condition at the time of stopping the switching is maintained. be done.

Furthermore, during the repeated operation of switching control, the first reception condition can be changed by appropriately operating the operation key group 30, and the second reception condition cannot be changed. It is composed of this is,
This is to prevent confusion between the first and second reception conditions during a change operation. For example, as shown in the flowchart of FIG. 3, when the operation key group 30 is operated to change the reception conditions (step 1), it is determined whether or not switching control is being repeated (step 2). . If the switching control is in operation, the contents of the first reception condition stored in the memory 28 are rewritten and the first reception condition is changed (step 3). While this switching control is in operation, rewriting of the contents of the second reception condition is not accepted. Note that if switching control is not in operation (
Step 3) In accordance with the operation of the operation key group 30, it is determined whether the reception condition change operation is to change the first or second reception condition (Step 4), and if it is the first reception condition, it is stored in the memory 28. The content of the first reception condition that has been set is rewritten (step 3), and if it is the second reception condition, the content of the second reception condition stored in the memory 28 is rewritten (step 5).

Furthermore, the contents of the first and second reception conditions stored in the memory 28 are replaced by appropriate operations of the operation key group 30 as replacement operation means. For example, Figure 4
As shown in the flowchart of FIG. ), the contents of the predetermined area where the second reception condition is stored in the memory 28 are moved to the predetermined area where the first reception condition is stored (step 3), and finally the contents that had been moved to the reserve area are moved to the predetermined area where the second reception condition is stored. The condition is moved to a predetermined area where the condition is stored (step 4), and the replacement operation is completed. By this replacement operation, the conventional second
The reception condition becomes the new first reception condition, and necessary changes can be made to the conventional second reception condition even during repeated switching control operations.

[0028] Another aspect of the operation of the radio receiver of the present invention is
One will be explained with reference to FIG. In FIG. 2, it is assumed that the program scan operation is set as both the first and second reception conditions. First, similarly to FIG. 1, the duty ratio, the first receiving condition, and the second receiving condition are appropriately set in steps 1 to 3 for switching between the first and second receiving conditions. Then, in step 4, the central processing unit 26 reads out the first reception condition from the memory 28, and under the control of the central processing unit 26, the local oscillation PLL frequency synthesizer 16
provides the mixing circuit 14 with a local oscillation signal that sweeps in an appropriate range, and the demodulator 20 is controlled to demodulate an appropriate radio wave format, and furthermore, the first reception condition including the frequency of the signal currently in the tuned state is set. is displayed on the display means 32. When a signal with an electric field strength equal to or higher than a predetermined level is received during this frequency sweep operation (step 5), the frequency sweep is stopped and the repetition control of switching between the first and second reception conditions is stopped, and step 6 The reception of the signal continues. If a signal with an electric field strength equal to or higher than a predetermined level is not received during the frequency sweep operation and the frequency sweep under the first reception condition is continued for the time set by the duty ratio and a predetermined time elapses (step 7), the frequency sweep is started. The frequency conditions for termination are stored in the memory 28. Then, in step 8, the central processing unit 26 reads out the second reception condition from the memory 28, and the central processing unit 26 starts frequency sweeping in a predetermined range using the set radio wave format. The display means 3 displays the second reception condition including the frequency of the signal currently in tune.
2, and part of it is controlled to blink to indicate that it is the second reception condition. If a signal with an electric field strength of a predetermined level or higher is received during this frequency sweep operation (step 9
), the frequency sweep is stopped and reception of the signal continues. When the frequency sweep according to the second reception condition is continued for the time set by the duty ratio and a predetermined time elapses without receiving a signal with an electric field strength of a predetermined level or higher (step 10), the frequency at which the frequency sweep is terminated is determined. The conditions are stored in the memory 28. Then, the process returns to step 4, where the first reception condition and the frequency condition at the time of termination of the frequency sweep are read out from the memory 28, and the frequency sweep operation following the previous frequency sweep is restarted.

In this manner, the frequency sweep operations under the first and second reception conditions are controlled and repeated at an arbitrarily set duty ratio. Even if one duration period set by the duty ratio is shorter than the time required to sweep the entire frequency range for each of the first and second reception conditions, the frequencies are The frequency sweep is resumed and continued so that the full range of frequency sweeps is completed during each repetition.

In addition, as an operation other than the above-mentioned operation example in the radio receiver of the present invention, the first reception condition is set to be tuned to a certain signal, and the second reception condition is set to program scan operation, memory scan operation, or mode scan operation. The first reception condition may be set to any frequency sweep operation, and the second reception condition may be set to a state tuned to a certain signal or to another frequency. Of course, it is also possible to set it to a sweep operation.

[0031]Also, the cycle of the duty ratio may be kept constant and the time allocation within the cycle may be changed as appropriate, and the time of one continuous period of the tuned state of the first and second reception conditions can be set individually. You can also do it. Furthermore, in the above embodiment, two reception conditions are set; however,
The present invention is not limited to this, and it may be configured such that three or more reception conditions are set and the three reception conditions are sequentially switched and controlled at an appropriately set duty ratio and repeated.

[0032]

Since the radio receiver of the present invention is constructed as described above, it provides the following special effects.

First, two or more different reception conditions are arbitrarily set, and the tuning state corresponding to these reception conditions is sequentially controlled and repeated with a duty ratio set to an arbitrary value. It is possible to perform standby reception and monitor the presence or absence of a signal with a duty ratio according to the priority level of the condition.

[0034] If one display means is sequentially switched and displayed to the reception condition under which the wireless receiver is currently tuned, even while the switching control is being repeated, the reception conditions under which the radio receiver is currently tuned will be displayed. can be easily recognized in real time.

Furthermore, while two or more different reception conditions are sequentially switched and controlled, only one of the main reception conditions can be changed, causing confusion with other reception conditions. Changes can be made easily without any trouble.

Furthermore, if the main reception condition and other reception conditions can be replaced by a replacement operation, confusion can be avoided by appropriately replacing other reception conditions that require a change operation with the new main reception condition. without letting
All reception conditions that require modification can be modified.

[0037] Furthermore, if the display means does not blink the display of the main reception condition, but blinks at least a part of the display of other reception conditions, whether or not the display is the main reception condition is determined by the presence or absence of blinking. can be easily identified.

[0038] Furthermore, if the frequency sweep operation is set under at least one reception condition, it is possible to investigate and monitor a seemingly wide range of signals with one radio receiver.

Furthermore, even if the frequency sweep operation is interrupted in the middle of the frequency range due to switching of reception conditions, if the next frequency sweep of the reception conditions is restarted from the frequency at which it was interrupted, the reception conditions will be changed. While the sequential switching control is repeated, the entire frequency range is swept.

[Brief explanation of the drawing]

FIG. 1 is a flowchart illustrating one operation of an embodiment of a wireless receiver of the present invention.

FIG. 2 is a flowchart illustrating another operation of an embodiment of the wireless receiver of the present invention.

FIG. 3 is a flowchart illustrating an example of an operation in which only the first reception condition can be changed while repeating switching control.

FIG. 4 is a flowchart illustrating an example of an operation of replacing the first and second reception conditions.

FIG. 5 is a block circuit diagram of one embodiment of the wireless receiver of the present invention.

[Explanation of symbols]

14 Mixing circuit 16 PLL frequency synthesizer for local oscillation 26
Central processing unit 28 Memory 30 Operation key group 32 Display means

Claims (7)

[Claims] 1. A system comprising a PLL frequency synthesizer for local oscillation, a memory for storing reception conditions, and a central processing unit for controlling the PLL frequency synthesizer for local oscillation according to the reception conditions, so that only one signal is received at a time. In the radio receiver, the reception condition setting means stores two or more different reception conditions in the memory, the duty ratio setting means sets the duty ratio of a tuned state according to the different reception conditions to an arbitrary value, and the The different reception conditions are sequentially read out from the memory using the duty ratio by a central processing unit, and the local oscillation PLL frequency synthesizer is configured to repeat sequential switching control according to the read reception conditions. Features a wireless receiver. 2. The radio receiver according to claim 1,
One display means for displaying the receiving condition is provided, and the reading is performed in response to switching control of the local oscillation PLL frequency synthesizer according to the receiving condition read by the central processing unit. A radio receiver characterized in that the reception condition is configured to be displayed on the display means. 3. The wireless receiver according to claim 1, wherein during the sequential switching control using the different reception conditions, the reception condition setting means changes the main reception condition of any one of the different reception conditions. 1. A radio receiver characterized in that it is configured to be operable, but other reception conditions cannot be changed or manipulated. 4. The radio receiver according to claim 3,
A wireless receiver characterized in that a replacement operation means is configured to replace a main reception condition that can be changed among the different reception conditions with another reception condition that cannot be changed. 5. The radio receiver according to claim 3,
A wireless receiver characterized in that when the unchangeable reception condition is displayed on the display means, at least a part of the display blinks. 6. The radio receiver according to claim 1 or 2, wherein at least one condition is set by the reception condition setting means.
A radio receiver characterized in that one of the reception conditions is a frequency sweep operation. 7. The radio receiver according to claim 6,
If the frequency sweep operation is aborted in the middle of the frequency range set in the reception condition and switched to another reception condition, the conditions under which it was aborted are stored in the memory, and the frequency sweep operation for the reception condition is restarted. 1. A radio receiver according to claim 1, wherein the radio receiver is configured to read the conditions stored in the memory and perform a frequency sweep operation based on the conditions.