JP3020490U - Wireless receiver with power saving function - Google Patents

Abstract

(57) Abstract: [PROBLEMS] To provide a wireless receiver having a power saving function, and to provide the wireless receiver supporting a plurality of frequencies with the power saving function without adding a complicated configuration. . SOLUTION: A setting switching means for switching a normal reception setting means and a priority reception setting means respectively corresponding to a priority frequency and a set frequency at a predetermined time ratio is provided with a reception signal from the outside for a predetermined time or more in a normal reception mode. Switch to the power-saving reception mode with a pause that stops the reception function when not detected, while returning from the power-saving reception mode to the normal reception mode when a reception signal corresponding to at least one of the frequencies is detected. I was allowed to. Further, instead of the priority frequency, only during the operation in the power saving reception mode, the reception operation of the specific frequency is intermittently performed, and the specific tone included in the specific frequency is detected.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

 The present invention relates to a wireless receiver, and more particularly to a wireless receiver having a power saving function.

[0002]

[Prior art]

 In the case of a radio receiver installed on a ship, in addition to performing normal reception according to the frequency set in advance, two different frequencies, ch16 and ch13, in the International VHF are more than the frequency set above. It is mandatory to operate so that priority can be received, and the priority between the above ch16 and ch13 is also set according to the navigation area. This situation also applies to radio receivers installed in aircraft, and multiple priority frequencies and mutual radio frequencies are used for aircraft-to-airport ground control, aircraft-to-air traffic control, and company radio, respectively. The priority is set.

In this way, when there are a plurality of priority frequencies that should be received with priority over the preset frequency and the priorities are negotiated with each other, for example, Japanese Patent Publication No. 53-53409. As in the radio receiver described in the publication, the priority is assigned between the frequency with the highest priority, the frequency with the lower priority and the frequency set above. Accordingly, the reception state is switched according to the situation, and the operation load associated with the above operation is reduced.

In the radio receiver, in the initial state, the three frequencies are alternately receivable at a predetermined time ratio, and when the reception signal of the highest priority frequency is detected, the priority signal is received. While forming a reception state corresponding to only the frequency, when a reception signal related to a low priority frequency is detected, the priority frequency and the highest priority frequency are alternately maintained in a receivable state. . When a reception signal related to the set frequency is detected, the reception operation in the above initial state is continued in preparation for the priority frequency that may be received thereafter, and the reception signal of the priority frequency is changed at any time. Operate so that it can be detected.

Further, although there is no obligation to receive the above-mentioned priority frequency, in order to ensure navigation safety, for example, in the US weather broadcast WX, an alert of a predetermined tone (1050 Hz, 10 seconds) is issued in an emergency such as a sudden change in weather. A signal is transmitted so that the weather information can be thoroughly disseminated during the emergency. In response to this, the receiver side performs a scanning operation of the reception frequency, and when a specific tone corresponding to the alert signal is detected, the reception mode of the weather broadcast WX is switched to.

By the way, since a wireless receiver generally consumes a certain amount of power even when it is waiting for a signal from the outside, in order to save such wasted power, the wireless receiver is in the above standby state. Has also provided a power-saving function that generates a dwell time at a constant cycle that reduces power consumption to the extent that it cannot receive external signals.

[0007]

[Problems to be solved by the device]

 However, as described in Japanese Patent Publication No. 53409/1993, it has been attempted to add a publicly known power saving function to a radio receiver supporting a plurality of frequencies. When the pause time is generated in the standby state, it is necessary to change the operation depending on the frequency of the received signal, but whether the signal transmitted during the pause time has the above set frequency. However, it is expected that a complicated configuration will be required, such as not being able to determine whether or not it is the priority frequency, and being unable to determine the subsequent operation. For this reason, the power saving function has not yet been added to the wireless receivers that support multiple frequencies.

Further, since the alert signal of the weather broadcast WX cannot be detected unless the receiver performs an intentional receiving operation such as scanning of the receiving frequency, the alert signal may be delayed in catching. It is pointed out that the above alert signal is not effectively used.

The present invention has been made in view of the above conventional circumstances, and an object of the present invention is to add a power saving function to a wireless receiver supporting a plurality of frequencies without adding a complicated configuration. In addition, it is an object of the present invention to provide a small-sized wireless receiver having a function of switching the reception state in response to the alert signal and capable of reducing power consumption.

[0010]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention employs the following means. That is, as shown in FIG. 1, a normal reception setting means 1 for enabling reception of a preselected frequency and a priority reception setting means 2 for enabling reception of a priority frequency that should be received with priority over the frequency. A wireless receiver adapted to be switched by the setting switching means 3, wherein the setting switching means 3 selectively switches the normal reception setting means 1 and the priority reception setting means 2 at a predetermined time ratio, and the priority frequency. The normal reception setting means 1 and the priority reception setting means 2 are intermittently operated together with a normal reception mode MN for continuously operating the priority reception setting means 2 when a reception signal corresponding to the above is detected and a pause time for stopping the reception function. It has two operation modes, power saving reception mode MS that operates automatically, and when no external reception signal is detected for a predetermined time or longer. Mode switching means 3 1 for switching from the normal reception mode MN to the power saving reception mode MS, and for returning from the power saving reception mode MS to the normal reception mode MN when a reception signal corresponding to at least one of the frequencies is detected. Is provided.

The pause time in the power saving reception mode MN of the setting switching means 3 is formed after the normal reception setting means 1 and the priority reception setting means 2 are continuously operated, or the normal reception setting means 1 And the priority reception setting means 2 can be formed between each operation time.

[0012] The priority reception setting means 2 is provided in a plurality corresponding to a plurality of priority frequencies for which mutual priorities are set, and the setting switching is being performed in the normal reception mode MN. The means 3 continues to operate the priority reception setting means 2a only when the reception signal corresponding to the priority frequency fp1 of the highest priority is detected, while the reception signal corresponding to the priority frequency fp2 other than the highest priority. When is detected, the priority reception setting means 2b corresponding to the detected frequency and the priority reception setting means 2a corresponding to a frequency having a higher priority than this can be switched at a predetermined time ratio. it can.

Further, in a radio receiver having two operation modes of a normal reception mode MN and a power saving reception mode MS, the setting switching means 3 operates intermittently during the operation in the power saving reception mode MS. The specific reception setting means 7 capable of receiving a specific frequency independent of the set frequency fu and the tone detecting means 8 for detecting the presence or absence of a specific tone from the received signal of the specific frequency fs are provided. The configuration in which the setting switching means 3 continuously operates the specific receiving means 7 in response to the detection of the tones is also useful for solving the above-mentioned problem. The specific reception setting means 7 may be operated in a cycle longer than the operation cycle of the normal reception setting means 1 in the power saving reception mode MS.

While the setting switching means 3 is operating in the normal reception mode MN, the normal reception setting means 1 and the priority reception setting means 2 are operated at a predetermined time ratio, and the reception corresponding to the priority frequency is performed. When a signal is detected, the reception of the frequency related to the normal reception setting means 1 is stopped and the priority frequency is preferentially received.

When no reception signal is detected in the normal reception mode MN for a predetermined period of time or longer, the mode switching means 31 switches the operation of the setting switching means 3 to the power saving reception mode MS to save power consumption. .

Even in the power saving reception mode MS, the normal reception setting means 1 and the priority reception setting means 2 are operated intermittently, so that the reception signals of the frequencies corresponding to them can be detected, and the reception signals can be detected. In response to the detection, the mode switching means 31 restores the operation mode of the setting switching means 3 from the power saving reception mode MS to the normal reception mode MN.

Further, the pause time in the power saving reception mode MS is formed after the normal reception setting means 1 and the priority reception setting means 2 are continuously operated, or the normal reception setting means 1 and the priority reception setting means. It may be formed during each of the two operating times.

Furthermore, the present invention can be applied to a case where there are a plurality of priority frequencies and the priorities are mutually set. Further, the tone detection means 8 intermittently detects the presence / absence of a specific tone of the specific frequency only in the power saving mode in which the power consumption is low, so that the specific tone can be identified without greatly increasing the power consumption. By checking whether the frequency fs is included or not, and if the specific tone is included, by continuously receiving the specific frequency fs, important information can be almost certainly received.

When detecting the specific tone, if there is at least a period shorter than the duration of the specific tone (for example, 10 seconds in the alert signal of the weather broadcast WX), there is no room for detection leakage, and it is not always necessary to save. It is not necessary to match the operating cycle of the normal reception setting means 1 in the power reception mode MS. Rather, in the sense of reducing power consumption, it is desirable to operate the specific reception setting means 7 at a cycle longer than the operation cycle of the normal reception setting means 1.

[0020]

[Embodiment]

 1 is a functional block diagram of an embodiment according to the present invention, FIG. 2 is a flow chart of a normal reception mode, FIG. 3 is a flow chart of a power saving reception mode, and FIG. 4 is a reception state thereof. It is a conceptual diagram which shows the time-dependent change of.

As shown in FIG. 1, the receiving means 5 to which the antenna 4 is connected has a frequency fu defined by the normal reception setting means 1 at a time ratio corresponding to the operation mode of the setting switching means 3 or preferential reception. One of the priority frequencies fp defined by the setting means 2 is detected, and the reception signal Sa is output to the signal detection means 6 in the subsequent stage. The signal detecting means 6 outputs the received signal Sa to the amplifier circuit or the like in the subsequent stage and outputs the received detection signal Sk to the mode switching means 31 in the setting switching means 3 when the received signal Sa is input. It is configured.

As will be described later, the mode switching means 31 switches, based on the reception detection signal Sk, whether the setting switching means 3 operates in the normal reception mode MN or the power saving reception mode MS.

That is, when the wireless receiver is turned on, the operation in the normal reception mode MN in the procedure as shown in FIG. 2 is started. First, in the mode switching means 31, an argument n indicating the number of repetition loops between the normal reception setting means 1 and the priority reception setting means 2 is reset (F1), and the setting switching means 3 receives the normal reception setting means 1. By connecting to 5, the reception of the set frequency f u is started and the timer 32 in the setting switching means 3 is started (F2). The argument n serves as a criterion for switching to the power saving reception mode MN in the subsequent step, and when the argument n is 3, the power saving reception mode MN is switched to.

The setting switching means 3 keeps receiving the set frequency fu until the timer 32 measures the time Ta, and when the reception detection signal Sk is input from the signal detection means 6 during this period, the above-mentioned argument is set. Reset n to zero (F3Y → F4 → F5 N). In step F4, the argument n is intermittently reset as long as the set frequency fu is received, so that it should not shift to the power saving reception mode MN to be described later even during the reception. There is.

When the timer 32 measures the time Ta, the setting switching means 3 causes the priority reception setting means 2 to receive the receiving means irrespective of whether or not the reception detection signal Sk is input to the mode switching means 31. By connecting to 5, the state in which the priority frequency fp can be received is formed and the timer 32 is restarted (F5Y → F6).

The setting switching means 3 maintains the above state until the timer 32 counts the time Tb, and there is no reception signal related to the priority frequency fp within the time Tb, that is, the reception detection signal Sk. If is not input to the mode switching means 31, "1" is added to the argument n and the procedure of receiving the set frequency fu again for the time Ta is repeated (F7N-> F8Y-> F9-> F10N-> F2).

On the other hand, when the reception detection signal Sk corresponding to the reception signal Sa relating to the priority frequency fp is input to the mode switching means 31 within the time Tb, the timer 32 is kept as long as the reception of the priority frequency fp continues. Is restarted, and only the reception state corresponding to the priority frequency fp is continued. After the reception of the priority frequency fp is completed, when the timer 32 measures the time Td, the argument n is reset, the normal reception mode MN is returned to the beginning, and the above series of steps are repeated (F7Y → F11). → F12 → ... → F13Y →→ F1).

Therefore, in the normal reception mode MN, if the time during which neither the set frequency fu nor the priority frequency fp is received continues for 3 × (Ta + Tb), the argument n reaches “3” and the mode switching means 31 Switches to operate the setting switching means 3 in the power saving reception mode MS described later (F10Y →).

In the power-saving reception mode MS, as shown in FIG. 3, the timer 32 is started, and the setting switching means 3 continues the normal reception setting means 1 and the priority reception setting until the timer 32 reaches the time Tc. By disconnecting none of the means 2 from the receiving means 5, the function of the receiving means 5 is stopped, and a pause time is provided to reduce the power consumption of the wireless communication device (→ F14 → F15N).

After the rest time has continued for the time Tc, the setting switching means 3 connects the priority reception setting means 2 to the receiving means 5 and the timer 32 is activated to receive the priority frequency fp for a predetermined time Tb '. Yes (F15Y → F16 → F17N → F18N).

When the reception of the priority frequency fp is detected and the reception detection signal Sk is input to the mode switching means 31 by the time Tb ', the power saving reception mode MS is ended and the normal reception mode MN is set. The same processing as when the priority frequency fp is received is repeated (F17Y →→ F11).

When the priority frequency fp is not received within the time Tb ′, the setting switching means 3 switches the normal reception setting means 1 to the receiving means 5 and starts the timer 32. , Receivable only for time Ta '(F19 → F20N → F21N).

When the reception of the set frequency fu is detected during the time Ta ', the power saving reception mode MS is ended and the normal reception mode MN is returned to the beginning (F20Y →→ F1).

Further, when even the set frequency fu is not received, the process returns to the beginning of the power saving reception mode MS and unless any received signal is detected, the set frequency fu and the priority frequency fp are intermittently changed as described above. Repeat reception.

FIG. 4A shows a reception state in the normal reception mode MN and the power-saving reception mode MS when no reception signal is detected. In the power-saving reception mode MS, the above setting is performed with a pause time Tc interposed. A state in which the frequency fu and the priority frequency fp are continuously received for the times Ta 'and Tb' is formed intermittently.

FIG. 4B shows a case where a reception signal of the priority frequency fp is detected during the power saving reception mode MS, and as long as the reception signal exists, the state in which the priority frequency fp can be received is shown. On the other hand, when the reception is stopped, the normal reception mode MN is executed from the beginning after a time Td.

Further, FIG. 4C shows a case where a received signal of the set frequency fu is detected during the power saving reception mode MS, and the normal reception mode MN is executed from the beginning, and the set frequency fu The priority frequency fp can be intermittently received even during reception of the.

In the above embodiment, during the reception operation in the power saving reception mode MS, after the continuous reception of the set frequency fu and the priority frequency fp, the pause time is formed. However, instead of the operation procedure shown in FIG. 3, as shown in FIG. 5, by interposing steps F14M and F15M that form a pause time Tc between steps F18 and F19, the set frequency fu and The priority frequency fp may be formed separately in time (see FIG. 4 (d)).

Further, as another embodiment of the present invention, a plurality of priority reception setting means 2a, 2b are provided as indicated by a chain double-dashed line in FIG. 1, and each priority reception setting means 2a, 2b corresponds thereto. The operation procedure of the configuration in which the priorities between the priority frequencies fp1 and fp2 are set in this order will be described below.

That is, FIGS. 6 and 7 are flow charts of the normal reception mode of another embodiment including the above-mentioned two priority reception setting means, FIG. 8 is a flow chart of the power saving mode, and FIG. It is a conceptual diagram which shows the transition of the receiving state.

As shown in FIG. 6, the argument n indicating the number of repetition loops of the normal reception setting means 1 and the priority reception setting means 2a, 2b is reset and, as will be described later, the priority reception setting means 2a, 2b. After setting the argument h set to either "0" or "1" to "0" (F31) corresponding to each of the 2b, the setting switching means 3 causes the normal reception setting means 1 to be the receiving means. By connecting to 5, the reception at the set frequency fu is started and the timer 32 is started (F32).

The setting switching means 3 keeps receiving the set frequency fu until the timer 32 measures the time Ta, and when the reception detection signal Sk is inputted from the signal detecting means 6 during this time, the argument is changed. n is reset to “0” (F33Y → F34 → F35N).

Further, when the timer 32 measures the time Ta, regardless of whether or not the set frequency fu is being received, one of the two prioritized reception setting means 2a, 2b is selected according to the value of the argument h. The process proceeds to the step of determining which is connected to the receiving means 5 (F36).

In the initial state, the argument h is "0", and after the argument h is switched to "1", the setting switching means 3 causes the priority reception setting means 2a corresponding to the priority frequency fp1 of the higher priority. Is connected to the receiving means 5 and the timer 32 is started (F36 Y → F37a → F38a). The reception state of the higher priority frequency fp1 is maintained until the timer 32 measures the time Tb, and if reception is not detected during this time, "1" is added to the argument n (F39aN → F40aY → F41). In this case, the argument n has not reached "3" yet, so that the reception state corresponding to the set frequency fu is restored (F42N → F32).

After the above procedure, the argument h is “1”, so after rewriting this to “0”, the priority reception setting means 2b corresponding to the lower priority frequency fp2 is received by the reception means. 5 and operates in the same manner as the reception of the priority frequency fp1 (F36N → F37b → ... → F40bY).

Further, when the reception of the priority frequency fp1 is detected within the time Tb in the state where the priority frequency fp1 of the higher priority can be received (FIG. 6: F39aY →), the procedure shown in FIG. 7 is performed. Transition. Here, the timer 32 is restarted, continues to receive only the priority frequency fp1 (→ FIG. 7: F43 → F44Y), and when the reception at the priority frequency fp1 is interrupted, waits for the time Td to elapse, and Returning to the beginning of the reception mode MN, the arguments n and h are reset to "0", and the reception by the normal reception setting means 1 is restarted (F44N → F45N → ... → F45Y →).

On the other hand, when the setting switching means 3 connects the lower priority reception setting means 2b to the receiving means 5 and when reception of the priority frequency fp2 is detected (FIG. 6: F39 bY →), the timer 32 is started. After that, the reception of the priority frequency fp2 is continued until the time Ta 'elapses (→ FIG. 7: F46 → F47Y → F51N). At this time, even if the priority frequency fp2 is being received, when the time Ta 'has elapsed, the setting switching means 3 connects the priority reception setting means 2a to the receiving means 5 to receive the higher priority frequency fp1. It is enabled and the timer 32 is restarted (F51Y → F52).

At this time, when the reception of the priority frequency fp1 is detected (F53Y), the timer 32 is restarted (F55) and continues to receive only the priority frequency fp1 and the reception of the priority frequency fp1 is completed. After that, after a lapse of time Td ', the lower priority frequency fp2 can be received again (F56N-> F57N->-> F56N-> F57Y-> F58->), and the operation of FIG. 7: F46 and thereafter is repeated.

Then, in response to the fact that the reception of the lower priority frequency fp2 is no longer detected, the timer 32 is activated, waits for the time Td to elapse, and the normal reception mode MN is executed from the beginning (F47N → F48 → F49N → F50Y →→ FIG. 6: F31).

As described above, in this embodiment, since there are two priority frequencies fp1 and fp2 that are given priority to each other, the lower priority frequency fp2 is received as shown in FIG. Occasionally, reception at the higher priority frequency fp1 is also made possible and a predetermined reception operation is realized.

Also, in the normal reception mode MN in this embodiment, when the argument n reaches “3”, that is, in the normal reception mode MN, no reception signal is detected within the time: 3 × (Ta + Tb). In this case, the power saving reception mode MS is entered (F4 2Y →).

In the power-saving reception mode MS, as shown in FIG. 8, none of the reception setting means 1, 2a and 2b is connected to the reception means 5 until the timer 32 is activated and the time Tc elapses. The pause time continues (FIG. 8: F59 → F60N → ... F60Y).

After the lapse of the above-mentioned time Tc, the upper priority frequency fp1, the lower priority frequency fp2, and the set frequency fu can be received, respectively, and no reception signal corresponding to any frequency is detected during this period. In this case, the procedure for forming the rest time is repeated again (F61 → F62N → F63Y → ... → F69Y → F59).

When at least one of the above reception signals is detected, as shown in FIG. 8, the power-saving reception mode MS is exited, and the steps of the normal reception mode MN corresponding to the frequency of the reception signal are respectively performed. Return to (,,).

FIG. 9 is a conceptual diagram showing changes with time in the reception state of the above embodiment, and FIG. 9 (a) shows a case where no reception signal is detected. In this case, in the normal reception mode MN, the time Tb at which the higher priority frequency fp1 is receivable is twice and the time Tb at which the lower priority frequency fp2 is receivable is between the receivable time Ta of the set frequency fu. After one time, the mode shifts to the power saving reception mode MS. In the power saving reception mode MS, a state is formed in which the set frequency fu is continuously received for the time Ta 'and the priority frequencies fp1 and fp2 are continuously received for each time Tb' with the pause time Tc interposed therebetween.

FIG. 9B shows a case where a received signal of the higher priority frequency fp1 is detected during the power saving reception mode MS, and as long as the received signal exists, only the priority frequency fp1 can be received. When the reception is stopped while the above state is continued, the normal reception mode MN is executed from the beginning after a time Td '.

Further, FIG. 9 (c) shows a case where a reception signal of the lower priority frequency fp2 is detected during the power saving reception mode MS. As long as the reception signal exists, the set frequency fu can be received. In addition to the above, even though the priority frequency fp2 is being received, the state in which the higher priority frequency fp1 can be received is intermittently formed. When the reception of the priority frequency fp2 is interrupted, the normal reception mode MN is executed from the beginning after a time Td '.

Further, FIG. 9 (d) shows a case where a reception signal of the set frequency fu is detected in the power saving reception mode MS, and in this case, it is understood that the normal reception mode MN immediately returns to the beginning. To be done.

As described above, in the above two embodiments, the setting switching means 3 is used in the normal reception mode MN in which the reception states corresponding to the set frequency and the priority frequency are alternately switched at a predetermined time ratio. On the other hand, when the received signal is not detected within the predetermined time in the normal reception mode MN, the power saving reception mode MS is entered, so that the power consumption can be saved when the communication frequency is low.

Moreover, even in the power saving reception mode MS, the predetermined step in the normal reception mode MN is restored in accordance with the frequency of the received signal, so that a complicated operation of the device is not required. Can be prepared to receive.

FIG. 10 is a functional block diagram of still another embodiment according to the present invention, FIG. 11 is an operation flow chart thereof, and FIG. 12 is a conceptual diagram showing a change in reception state with time. As shown in FIG. 10, in this embodiment, the receiving means 5 connected to the antenna 4 detects the frequency according to the operation mode of the setting switching means 3, and when operating in the normal receiving mode MN, the normal receiving setting means. 1 receives the set frequency fu corresponding to 1 and operates intermittently between the normal reception setting means 1 and the specific frequency setting means 7 when operating in the power-saving reception mode MS, and when operating in the specific reception mode MP The setting switching means 3 controls so as to receive the specific frequency fs corresponding to the signal setting means 7.

The received signal Sa generated by the receiving means 5 is input to the signal detecting means 6, and in response to this, the signal detecting means 6 receives toward the mode switching means 31 provided in the setting switching means 3. The detection signal Sk is output. If the reception detection signal Sk is not input to the mode switching means 31 for a predetermined time or more as will be described later, the switching operation from the normal reception mode MN to the power saving reception mode MS is performed.

Further, in this embodiment, tone detecting means 8 for detecting whether or not a specific tone is included in the received signal Sa is provided, and as will be described later, a specific receiving mode MP is set from the power saving receiving mode MS. The tone detection signal St serving as a reference for switching to the mode is output to the mode switching means 31.

As shown in FIG. 11, the operation procedure of the above-described configuration starts the reception at the set frequency fu in the normal reception mode MN and activates the timer 32 (FIG. 11: F71). At this time, if the reception detection signal Sk is input to the mode switching means 31, the reception at the set frequency fu is continued (F72Y → F71) while the reception detection signal Sk is kept for the time Ta or more. If it is not input to, the setting switching means 3 operates in the power saving reception mode MS in the subsequent stages (F73Y → F74).

In the power-saving reception mode MS, first, after the rest time for stopping the operation of the receiving means 5 for the time Tc is generated (F74 → F75N → F75Y), it is switched to the specific reception setting means 7 at the specific frequency fs. Is received and the timer 32 is started (F76).

As a result, if the received signal Sa generated by the receiving means 5 contains a specific tone, the tone detecting means 8 outputs the tone detecting signal St to the mode switching means 31, and the operator performs a predetermined operation. The reception mode is switched to the specific reception mode Mp for continuing the reception at the specific frequency fs until a certain time (F77Y → F79N → ... → F79Y →).

On the other hand, if the tone detection signal St is not output from the tone detection means 8 during the time Ts, then it is received at the set frequency fu for the time Ta '(F77N → F78 Y → F80), and during this period. If the reception detection signal Sk is not output, the pause time is generated again to continue the power saving reception mode MS (F81N → F82Y → F74).

On the other hand, when reception at the set frequency fu is detected during the time Ta ′, the normal reception mode MN is restored (F81Y →→ F71). As described above, in the power-saving reception mode MS, as shown in FIG. 12, the reception operation at the specific frequency fs and the set frequency fu is intermittently activated with a pause, and the specific frequency fs If there is a specific tone in, the reception operation is performed in the specific reception mode Mp for continuously receiving the specific frequency fs.

As described above, in the present embodiment, the power consumption of the device can be reduced by receiving the specific frequency fs only during the operation in the power saving reception mode MS, and in particular, in the normal reception mode. Probability that most of the time will be the operating time in power saving reception mode MS at the level of the individual user who uses the transceiver type receiver if the reference time Ta for shifting to power saving reception mode MS from MN is sufficiently short. Becomes large, the specific tone in the specific frequency fs can be detected, and important weather information can be reliably caught.

As shown in FIG. 12, the set frequency fu and the specific frequency fs in the power-saving reception mode MS are set so that they can be continuously received with the same pause time Tc interposed therebetween. For example, when the alert signal of the US weather broadcast WX is used as the specific tone, the duration of the alert signal is specified to be 10 seconds, and the receiving cycle of the specific frequency fs is about 8 seconds which is slightly shorter than this. When set to, there is no detection leak of the alert signal. From the viewpoint of reducing the power consumption, regardless of whether the set frequency fu or the specific frequency fs is received, the shorter the receivable time set in the power saving reception mode MS, the more the power consumption can be saved. It is desirable that the period at which the specific frequency fs can be received be set longer than the reception period of the set frequency fu.

FIG. 13 is an operation flow chart of still another embodiment of the present invention made based on the above facts, and FIG. 14 is a conceptual diagram showing a change with time of the reception state. Note that this embodiment operates using the configuration of FIG. 10 described above as it is, and steps common to the embodiment shown in FIG. 11 are given the same reference numerals, and the description thereof will not be repeated. I try to avoid it.

That is, the normal reception mode MN represented by steps F71 to F73 in FIG. 13 is the same as that in the above-described embodiment, and the normal reception mode MN is changed to the power-saving reception mode MS. At the time of transition, a step Fp1 for initializing an argument I for counting the number of rest times, which will be described later, to "0", and a step Fp2 for incrementing the above argument I by "1" each time the rest time ends, A step Fp3 is added so that the set frequency fu can be received if the argument I has not reached the specified value N, and the specific frequency fs can be received if the argument I has reached the specified value N.

As a result, as shown in FIG. 14, after shifting to the power saving reception mode MS, the set frequency fu is intermittently received until the number of pauses reaches the specified value N, and the Nth pause is performed. When the time is over, the specific frequency fs is received. When the specific tone is not detected even when the specific frequency fs is received, the process returns to step Fp1 for initializing the argument I to "0", whereby the specific frequency fs can be received. Becomes N.times.Tc + (N-1) .times.Ta '+ Ts, and if the specified value N is appropriately set, reception can be performed at any cycle.

[0074]

[Effect of device]

 As described above, in the present invention, it is possible to add a power saving function to a wireless receiver that performs a receiving operation according to a plurality of frequencies and priorities set between the frequencies, and only in the normal receiving mode. Since the power saving reception mode is switched based on the presence / absence of a received signal, an appropriate reception operation is guaranteed without using a means for discriminating the frequency.

Further, the reception is performed at the specific frequency intermittently only during the operation in the power saving reception mode in which the power consumption of the device is reduced, and the specific tone in the specific frequency is detected. This has the effect that the set frequency can be exchanged at any time without imposing a burden on the device, and important information transmitted by the specific frequency can be almost certainly caught.

In addition, the period at which the specific frequency can be received is set to be shorter than the duration of the specific tone that is defined in advance, and the power saving reception mode that does not increase the power consumption while supporting the two frequencies Can be formed.

[Brief description of drawings]

FIG. 1 is a functional block diagram of the present invention.

FIG. 2 is a flow chart of a normal reception mode according to an embodiment of the present invention.

FIG. 3 is a flow chart of a power saving reception mode according to an embodiment of the present invention.

FIG. 4 is a conceptual diagram showing a change over time in a reception state according to an embodiment of the present invention.

FIG. 5 is a flow chart of a modification of the power saving reception mode of the embodiment according to the present invention.

FIG. 6 is a flow chart of a normal reception mode of another embodiment according to the present invention.

FIG. 7 is a flow chart of a normal reception mode of another embodiment according to the present invention.

FIG. 8 is a flow chart of a power saving reception mode according to another embodiment of the present invention.

FIG. 9 is a conceptual diagram showing a change with time of a reception state of another embodiment according to the present invention.

FIG. 10 is a functional block diagram of another embodiment according to the present invention.

FIG. 11 is an operation flow chart of still another embodiment according to the present invention.

FIG. 12 is a conceptual diagram showing a time-dependent change in a reception state according to still another embodiment of the present invention.

FIG. 13 is an operation flow chart of still another embodiment according to the present invention.

FIG. 14 is a conceptual diagram showing a change over time in a reception state according to still another embodiment of the present invention.

[Explanation of symbols]

 1 Normal reception setting means 2 (2a, 2b) Priority reception setting means 3 Setting switching means 7 Specific reception setting means 8 Tone detection means 31 Mode switching means MN Normal reception mode MS Power saving reception mode MP Specific reception mode fp Priority frequency fu setting Frequency fs Specific frequency Sa Received signal

Claims (6)

[Scope of utility model registration request] 1. A setting switching means switches between normal reception setting means capable of receiving a preselected set frequency and priority reception setting means capable of receiving a priority frequency to be received prior to the frequency. In the wireless receiver, the setting switching means selectively switches the normal reception setting means and the priority reception setting means at a predetermined time ratio, and when a reception signal corresponding to the priority frequency is detected. There are two operation modes: a normal reception mode in which the priority reception setting means continues to operate, and a power saving reception mode in which the normal reception setting means and the priority reception setting means are intermittently operated with a pause time for stopping the reception function. In addition to the above, the normal reception mode is switched to the power saving reception mode when an external reception signal is not detected for a predetermined time or longer. Ri changing one radio receiver having a power saving function, characterized in that it comprises a mode switching means for returning from the power saving reception mode when receiving signals corresponding to at least one of the frequency is detected in the normal reception mode. 2. The down time in the power saving reception mode of the setting switching means is formed after the normal reception setting means and the priority reception setting means are continuously operated.
A wireless receiver having the power saving function described in. 3. The radio with a power saving function according to claim 1, wherein the down time in the power saving reception mode of the setting switching means is formed between the respective operation times of the normal reception setting means and the priority reception setting means. Receiving machine. 4. The priority reception setting means is provided in a plurality corresponding to a plurality of priority frequencies whose priorities are mutually set, and the setting switching means operating in the normal reception mode includes: The priority reception setting means is continuously operated only when the reception signal corresponding to the priority frequency with the highest priority is detected, while the reception signal corresponding to the priority frequency other than the highest priority is detected. 2. The radio having the power saving function according to claim 1, wherein the priority reception setting means corresponding to the selected frequency and the priority reception setting means corresponding to the frequency having a higher priority than that are switched at a predetermined time ratio. Receiving machine. 5. A normal reception setting means for enabling reception of a preselected set frequency, a normal reception mode for continuously operating the normal reception setting means, and a pause time for stopping the reception function. In a radio receiver including a setting switching means having two operation modes, a power saving reception mode for intermittently operating the normal reception setting means, the normal setting is performed while the setting switching means is operating in the power saving reception mode. Along with the reception setting means, the specific reception setting means for intermittently receiving a specific frequency independent of the set frequency is operated, and based on the output of the tone detection means for detecting a specific tone from the received signal at the specific frequency. A power saver comprising mode switching means for switching to a specific reception mode for continuously operating the specific reception means. Radio receiver having a. 6. The setting switching means operates the specific reception setting means in a cycle longer than an operation cycle of the normal reception setting means in the power saving reception mode and shorter than a predetermined duration of a specific tone. The wireless receiver having the power saving function according to claim 5.