JP2001298377A - Rechargeable receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rechargeable receiver capable of securing a communication area corresponding to a receiver sensitivity while making the life of a battery long. SOLUTION: This receiver 2 is provided with a receiving antenna 21 for fetching a transmission signal being a radio signal from the air, a receiving circuit 22 for demodulating data from the transmission signal, a battery 24 for power feeding, a power supply switch 25 inserted to a feed line from the battery 24 to the circuit 22, and a reception control circuit 23 which is fed by the battery 24 and also performs on/off control of the switch 25 with a reception control signal sRc. The receiver 2 is also provided with a charging circuit 26 for charging the battery 24 and a charging detection circuit 27 for detecting whether or not the battery 24 is in the process, of charging on the basis of an output of the circuit 26, and the reception control circuit 23 makes the switch 25 on to make the receiving circuit 22 continuously receivable while a charging detection signal sSe is inputted from the circuit 27.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rechargeable receiver which uses a rechargeable battery as a power source and receives a transmission signal as a radio signal transmitted from a transmitter.

[0002]

2. Description of the Related Art FIG. 1 shows a conventional wireless system using a rechargeable receiver of this kind (hereinafter simply referred to as a receiver).
1 will be described. Here, the receiver is
A receiving circuit that receives a transmission signal that is a wireless signal from a transmitter, a reception control circuit that controls the operation of the reception circuit based on an output signal of the reception circuit, and a rechargeable battery that supplies power to the reception circuit and the reception control circuit. And a power switch inserted in a power supply path from the battery to the receiving circuit.

FIG. 11A shows a format of a transmission signal transmitted from a transmitter, and the transmission signal is composed of a preamble and four data D1, D2, D3, and D4. Here, if the time length of the preamble is L1, the time length of each of the data D1 to D4 is d, and the time length of the frame of the transmission signal is L2, the relationship is L2 = L1 + 4 × d.

FIG. 11B shows a state of a receiving circuit in a standby period in which a transmission signal from a transmitter is not received. In FIG. 11B, during the period of ton1, the power supply switch is turned on by the reception control signal from the reception control circuit to the power supply switch, so that the reception circuit is operating (in a receivable state), and During the period, the power switch is turned off by the reception control signal from the reception control circuit to the power switch, and thus the reception circuit is stopped (in a state where reception is impossible). In short, the reception control circuit is in a standby period in which no transmission signal is received from the transmitter,
By performing on / off control of the power switch, the receiving circuit is operated intermittently as shown in FIG.

FIG. 11C shows a state of the receiving circuit when receiving a transmission signal from the transmitter. In FIG. 11 (c), during the period of ton2, it is continuously turned on by a reception control signal from the reception control circuit to the power switch.

Here, the reception control circuit is shown in FIG.
When the receiving circuit is operated intermittently as shown in (b), if it is determined that there is a carrier based on the output of the receiving circuit, the receiving circuit is continuously operated as shown in FIG. After receiving the data and completing the data reception, the receiving circuit is again operated intermittently as shown in FIG.

FIG. 12 shows the operation of the above-described reception control circuit.
This will be described with reference to the flowchart shown in FIG.

When the reception control circuit starts the reception operation (S11), the reception control circuit starts counting of a first timer for managing the stop time (the above-mentioned toff1), and monitors the first timer until the stop time toff1 elapses. Continue (S12). When the count of the first timer ends, the operation time (the above-mentioned ton)
The counting of the second timer for managing 1) is started, and the presence or absence of a carrier is continuously monitored during the operation time ton1 (S1).
13). If there is no carrier until the count of the second timer ends, the count of the first timer for managing the stop time toff1 is restarted. On the other hand, t
If it is determined that there is a carrier during on1, the receiving circuit is operated continuously to take in the received data (S1).
14) When the data capture is completed (S15), the count of the first timer for managing the stop time toff1 is restarted.

In the following, in the reception control circuit,
The process of intermittently operating the receiving circuit to determine the presence or absence of a carrier is referred to as intermittent receiving process, and the process of continuously operating the receiving circuit to capture received data is referred to as data receiving process.

In the above-mentioned receiver, the power consumption is reduced by intermittently operating the receiving circuit during a standby period in which no transmission signal is received from the transmitter, and the life of the battery is extended.

[0011]

However, in the above-mentioned conventional receiver, the data reception processing is performed after it is determined that there is a carrier during the intermittent reception processing, so that the communication area between the transmitter and the receiver is received. It is determined by the threshold for determining that there is a carrier in the device. Therefore, when the receiving sensitivity of the receiver is superior to the threshold value for determining that there is a carrier, the carrier receiving area is smaller than the communication area in the case of using the continuous receiving method that does not detect the carrier or the data receiving process. There is a problem that the width of the intermittent reception processing for performing detection becomes narrower.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a rechargeable receiver capable of securing a communication area corresponding to reception sensitivity while extending the life of a battery. Is to do.

[0013]

According to a first aspect of the present invention, there is provided a receiving means for receiving a transmission signal, which is a radio signal transmitted from a transmitter, and intermittently operating the receiving means. Control means for continuously operating the receiving means upon detecting the transmission signal based on the output of the receiving means to capture the data of the transmission signal; a rechargeable battery for supplying power to at least the receiving means and the control means; A determination unit that determines whether or not the battery is not being charged; and if the determination unit determines that the battery is not being charged, the receiving unit is operated intermittently until a transmission signal is detected. The receiver is operated continuously, and when the battery is not charging, the receiver is operated intermittently until a transmission signal is detected, so that the life of the battery is extended. It can, also, during the charging of the battery because the receiver continuously operated perform standby reception without performing detection of the carrier, it is possible to ensure the communication area corresponding to the reception sensitivity.

According to a second aspect of the present invention, in the first aspect of the present invention, a notifying unit for performing an external notification is provided, and the control unit detects a reception input level within a receivable frequency band of the receiving unit as a voltage value. A voltage detection unit that continuously monitors the detection voltage value while the determination unit determines that the battery is being charged, and allows the detection voltage value in a standby period when no transmission signal is received from the transmitter to be allowed. When the noise level exceeds a predetermined value set in accordance with the possible noise level, the notification is made by the notification means, so that when the surrounding noise level becomes high enough to hinder communication with the transmitter, the notification is made by the notification means. Therefore, it is possible to urge the user to take appropriate processing such as changing the installation location.

According to a third aspect of the present invention, in the first aspect of the present invention, the control means has a voltage detection means for detecting a reception input level within a frequency band receivable by the reception means as a voltage value. While it is determined that charging is being performed, the detection voltage value is continuously monitored, and a value larger than the detection voltage value by the voltage detection unit in the standby period in which the transmission signal is not received from the transmitter by a specified value, When the receiving means is operated intermittently, it is set as a threshold value for determining that there is a carrier, so that the threshold value is set in accordance with fluctuations in the surrounding noise level. It is prevented that the presence of a carrier is determined by the influence of noise, and intermittent reception processing suitable for the surrounding environment is performed. Can.

According to a fourth aspect of the present invention, in the first aspect of the present invention, there is provided a notifying unit for performing external notification, the receiving unit has a plurality of channels, and the control unit is provided with a frequency receivable by the receiving unit. A voltage detection unit for detecting a reception input level in the band as a voltage value, and while the determination unit determines that charging is being performed, periodically changes a channel of the reception unit and detects a detection voltage for each channel. Keep monitoring the values,
When the detected voltage value in the standby period in which no transmission signal is received from the transmitter exceeds a predetermined value set in accordance with the allowable noise level, the channel is notified by the notification means, so that the surrounding noise level is reduced. If the noise level exceeds the allowable noise level, the notification unit notifies the user of the channel, so that the user can be prompted to take appropriate measures such as changing the channel or changing the installation location.

According to a fifth aspect of the present invention, in the first aspect, the receiving means has a plurality of channels, and the control means comprises:
It has voltage detection means for detecting the reception input level within the receivable frequency band of the reception means as a voltage value, and periodically changes the channel of the reception means while the determination means determines that charging is in progress. To continuously monitor the detected voltage value of each channel, and intermittently operate the receiving means with each value larger than the detected voltage value of each channel by a specified value in a standby period in which a transmission signal from the transmitter is not received. Sometimes, the threshold value for determining the presence of a carrier is set for each channel, so that the threshold value for determining that a carrier is present changes in response to fluctuations in the surrounding noise level, and intermittent reception processing suitable for the surrounding environment is performed. It is possible to prevent the life of the battery from being shortened due to noise.

According to a sixth aspect of the present invention, in the first aspect of the present invention, there is provided a notifying means for performing external notification, the receiving means has a plurality of channels, and the control means is provided with a frequency which can be received by the receiving means. A voltage detection unit for detecting a reception input level in the band as a voltage value, and while the determination unit determines that charging is being performed, periodically changes a channel of the reception unit and detects a detection voltage for each channel. Keep monitoring the values,
In the standby period in which no transmission signal is received from the transmitter, the difference between the detected voltage value of the channel for which the minimum detected voltage value is obtained and the detected voltage value of the currently set channel among the detected voltage values for each channel is notified by the notification means. Therefore, if there is a large difference between the currently set channel and its minimum value, it can be determined that there is a possibility that the same type of wireless device or the like is affected by channel interference.

According to a seventh aspect of the present invention, in the first aspect of the present invention, there is provided a notifying unit for performing an external notification, the receiving unit has a plurality of channels, and the control unit is configured to control a frequency receivable by the receiving unit. A voltage detection unit for detecting a reception input level in the band as a voltage value, and while the determination unit determines that charging is being performed, periodically changes a channel of the reception unit and detects a detection voltage for each channel. Keep monitoring the values,
When the difference between the minimum detected voltage value and the detected voltage value of the currently used channel among the detected voltage values for each channel in the standby period in which the transmission signal is not received from the transmitter exceeds a predetermined value, Since the notification means notifies the user to change to the minimum channel,
Since a channel change to a channel with a lower noise level is prompted, the user can select a channel with a lower noise level.

[0020]

(Embodiment 1) In this embodiment,
The wireless system shown in FIG. 1 will be exemplified. The wireless system shown in FIG. 1 includes a transmitter 1 that transmits a transmission signal as a wireless signal, and a rechargeable receiver (hereinafter, abbreviated as a receiver) 2 that receives a transmission signal transmitted from the transmitter 1. Is done.

The transmitter 1 includes a transmission antenna 15 for emitting a transmission signal into the air, a transmission circuit 13 for transmitting the transmission signal via the transmission antenna 15, a battery 11 for power supply, and a transmission circuit 13 from the battery 11. Power supply switch 14 inserted in the power supply path of the
3 to transmit the transmission data signal sTd or the transmission control signal sTd.
A transmission control circuit 12 for controlling the power switch 14 to be turned on / off by Tc. Note that the transmission circuit 13
An amplification circuit for modulating the transmission data sTd sent from the transmission control circuit 12 and amplifying the output to a specified output is built in.

On the other hand, the receiver 2 includes a receiving antenna 21 for taking in a transmission signal from the air, a receiving circuit 22 for demodulating data from the transmission signal received by the receiving antenna 21, a battery 24 for power supply, and a receiving circuit 24 from the battery 24. A power switch 25 inserted into a power supply path to the circuit 22; and a power switch 25 powered by the battery 24 and controlled by the reception control signal sRc.
A charging control circuit 23 for charging the battery 24, and a charge detection circuit 27 for detecting whether or not the battery 24 is being charged based on the output of the charging circuit 26. . Here, the reception control circuit 23
When the charge detection signal sSe from the charge detection circuit 27 is input, the power switch 2
5 is turned on, and the receiving circuit 22 is operated continuously to make it possible to receive continuously.

The reception data signal sRe demodulated by the reception circuit 22 and an RSSI (Received Signal St) indicating a reception input level within a receivable frequency band of the reception circuit 22.
rength Indicator) What is the signal sRS?
Is output to

The receiver 2 is a portable receiver, which can be carried by a user as shown in FIG. 2A, and is shown in FIG. 2B when the battery 24 is charged. May be placed on the charging stand 4 as described above. Here, the receiver 2
The battery 24 is charged from the charging stand 4 via the charging circuit 26 by being placed on the charging stand 4. In the present embodiment, the receiving circuit 22 forms a receiving unit, the receiving control circuit 23 forms a control unit, and the charging detecting circuit 27 forms a determining unit.

Hereinafter, the operation of the above-described wireless system will be described with reference to FIG.

FIG. 3A shows a format of a transmission signal transmitted from the transmitter 1, and the transmission signal is composed of a preamble and four data D1, D2, D3 and D4. Here, if the time length of the preamble is L1, the time length of each of the data D1 to D4 is d, and the time length of the frame of the transmission signal is L2, there is a relationship of L2 = L1 + 4 × d.

FIG. 3B shows a state of the receiving circuit 22 during a standby period in which the battery 24 is not being charged and the transmission signal from the transmitter 1 is not received. In FIG. 3B, t
Since the power switch 25 is turned on by the reception control signal sRc from the reception control circuit 23 to the power switch 25 during the on1 period, the reception circuit 22 is operating (in a receivable state). Since the power switch 25 is turned off by the reception control signal sRc from the reception control circuit 23 to the power switch 25, the reception circuit 22 is stopped (it is in a state where reception is impossible). In short, the reception control circuit 23 controls the power switch 25 to be on and off during the standby period in which the charge detection signal sSe from the charging circuit 27 is not input and the transmission signal from the transmitter 1 is not received. 22 to FIG.
It is operated intermittently as shown in FIG.

FIG. 3C shows the state of the receiving circuit 22 when receiving a transmission signal from the transmitter 1. In FIG. 3C, during the period of ton2, the reception control signal sRc from the reception control circuit 23 to the power switch 25 continuously turns on.

Here, the reception control circuit 23 is configured as shown in FIG.
When the receiving circuit 22 is operated intermittently as shown in FIG. 3B and it is determined that there is a carrier based on the output of the receiving circuit 22, as shown in FIG. Are continuously operated to receive data and upon completion of data reception, the receiving circuit 22 is again operated intermittently as shown in FIG.

FIG. 3D shows the operation of the reception circuit 22 when the charge detection signal sSe from the charging circuit 27 is input to the reception control circuit 23 and the reception control circuit 23 turns on the power switch 25 continuously. The state is shown. That is,
FIG. 3D shows that the receiving circuit 22 is continuously in a receivable state.

The operation of the reception control circuit 23 will be described with reference to the flowchart shown in FIG.

When the reception control circuit 23 starts the reception operation (S1), the charge detection signal sS from the charge detection circuit 27 is received.
e is present (S2), and the charge detection signal sSe is determined.
If there is no, the first time to manage the stop time (toff1 above)
The timer (not shown) starts counting and continues monitoring the first timer until the stop time toff1 elapses (S
3). When the counting of the first timer is completed, the counting of the second timer (not shown) for managing the operation time (the above-mentioned ton1) is started, and the monitoring of the presence or absence of the carrier is continued during the operation time ton1 (S4). . If there is no carrier until the count of the second timer ends, the count of the first timer for managing the stop time toff1 is restarted. On the other hand, when it is determined that there is a carrier during ton1, the receiving circuit 22 is continuously operated to capture the received data signal sRe (S5). When the capturing of the received data signal sRe is completed (S6), The count of the first timer for managing the stop time toff1 is restarted.

On the other hand, if it is determined in S2 that the charge detection signal sSe is present, the receiving circuit 22 is shifted to the continuous operation, and it is determined whether or not there is the received data signal sRe (S7). If there is sRe, receive the received data signal sRe demodulated from the transmission signal (SRe
8) When the reception of the reception data signal sRe is completed, the process returns to the standby state. When the reception of the reception data signal sRe fails and the reception of the reception data signal sRe cannot be completed, the continuous reception state is continued.

In the reception control circuit 23, a process of intermittently operating the reception circuit 22 to determine the presence / absence of a carrier is referred to as an intermittent reception process, and the reception circuit 22 is continuously operated to generate the reception data signal sRe. The capturing process is referred to as a data receiving process.

The above-described receiver 2 operates at a low power consumption by intermittently operating the receiving circuit 22 during a standby period in which the receiver 2 is not placed on the charging stand 4 and a transmission signal from the transmitter 1 is not received. And the service life of the battery 24 is extended.

By the way, in the conventional receiver, the communication area at the time of the intermittent reception operation for determining the presence or absence of a carrier before receiving data is determined by the threshold value used for detecting the presence or absence of the carrier. When the sensitivity is better, there is a problem that the communication area becomes narrower than in the continuous reception state in which the presence or absence of a carrier is not detected.

On the other hand, in the present embodiment, the user 3
When the receiver 2 carries the receiver 2, the life of the battery 24 can be extended by performing the intermittent operation. When the battery 24 is charged, the communication is wider than at the time of the intermittent reception operation by waiting for the reception data in the continuous reception state. Communication can be performed in an area, and a communication area corresponding to the reception sensitivity can be secured.

(Embodiment 2) The basic configuration of the rechargeable receiver of this embodiment is substantially the same as that of Embodiment 1, and the reception control circuit 23 of the receiver 2 shown in FIG.
A voltage detection unit (not shown) for detecting a reception input level (the RSSI signal) in a receivable frequency band (hereinafter referred to as a reception band) as a voltage value, and a charge detection circuit 27 as a determination unit. While the charge detection signal sSe is being input from, the detection voltage value is continuously monitored, and it is detected that the detection voltage value is high enough to affect communication with the transmitter 1. In this case, the fact that the noise level is high is displayed on the display unit 28 (see FIG. 2) to notify the user. Note that the receiver 2
When a sound output unit is provided, the fact that the noise level is high may be notified by sound. By performing such notification, it is possible to prompt the user to take appropriate measures such as changing the installation location of the charging stand 4. Here, the display unit 28 and the sound output unit constitute a notification unit.

FIG. 5 shows RS representing the reception level within the reception band.
This is a graph of an SI curve. For example, when the detection voltage becomes Vn (the received power at this time is Pn), the user may be notified that the noise level is high.

The other operation is the same as that of the first embodiment. During charging of the battery 24, the receiving circuit 22 operates continuously as in the first embodiment.

(Embodiment 3) The basic configuration of the rechargeable receiver of this embodiment is substantially the same as that of Embodiment 1, and in the receiver 2 shown in FIG.
A voltage detection unit (not shown) for detecting a reception input level (the RSSI signal) in a receivable frequency band (hereinafter referred to as a reception band) as a voltage value, and a charge detection circuit 27 as a determination unit. While the charge detection signal sSe is being input from the receiving circuit 22, the detection voltage value is continuously monitored, and a value Vc, which is larger than the detection voltage value Vn corresponding to the RSSI characteristic shown in FIG. Is set as a threshold value for determining the presence or absence of a carrier when performing the intermittent operation.

By the way, in the conventional receiver, once the threshold value for determining that there is a carrier is set, the threshold value is fixed to that value. Therefore, when the noise level in the surroundings changes and deteriorates, there is no carrier. Despite this, it is determined that there is a carrier and the receiving circuit shifts to the continuous receiving state.
The average current consumption has increased and the life of the battery has been shortened.

On the other hand, in the present embodiment, when the ambient noise level is high, the threshold value is also large, so that the life of the battery 24 can be prevented from being shortened. Further, when the surrounding noise level is low, the threshold value becomes small, so that the communication area can be set wider.

The other operations are the same as those of the first embodiment. During the charging of the battery 24, the receiving circuit 22 operates continuously as in the first embodiment.

(Embodiment 4) The basic configuration of a rechargeable receiver of this embodiment is substantially the same as that of Embodiment 1, and in the receiver 2 shown in FIG.
Hn, CH2, CH3,..., And CHn, and the reception control circuit 23 detects a reception input level (the RSSI signal) within a receivable frequency band of the reception circuit 22 as a voltage value (not shown). During the period when the charge detection signal sSe is input from the charge detection circuit 27 as the determination means, the channels CH1, CH2, and CH of the reception circuit 22 are not received and the reception data signal sRe is not received.
,..., CHn are sequentially changed periodically, and as shown in FIG. 7B, each channel CH1, CH2, CH3,.
monitor the detection voltage value corresponding to the reception input level for each n,
When a channel whose detection voltage value (that is, noise level) at this time is high enough to affect communication with the transmitter 1 is detected, a channel having a high noise level is determined as an unusable channel. By displaying the information on the channel 28, the user can be notified of the unusable channel. When the receiver 2 includes a sound output unit, an unusable channel having a high noise level may be notified by sound. By performing such notification, it is possible to prompt the user to take appropriate measures such as changing the channel or changing the installation location of the charging stand 4. For example, according to the RSSI characteristics shown in FIG. 7A, when the detected voltage value exceeds Vn, it is sufficient to report the channel as unusable. Here, the display unit 2
8. The sound output means constitutes the notification means.

The other operations are the same as those in the first embodiment. During the charging of the battery 24, the receiving circuit 22 operates continuously as in the first embodiment.

(Embodiment 5) The basic configuration of the rechargeable receiver of this embodiment is substantially the same as that of the first embodiment. In the receiver 2 shown in FIG.
Hn, CH2, CH3,..., And CHn, and the reception control circuit 23 detects a reception input level (the RSSI signal) within a receivable frequency band of the reception circuit 22 as a voltage value (not shown). And the charge detection circuit 2
7, while the charge detection signal sSe is being input.
In a state where the reception data signal is not received, the reception circuit 22
, CHn are periodically and sequentially changed, and as shown in FIG.
Monitor the detected voltage values corresponding to the received input levels for each of H1, CH2, CH3,..., CHn, and determine each value larger than each detected voltage by a specified value β when the receiving circuit 22 is operated intermittently. The feature is that a threshold value for determination is set for each channel. Therefore, for example, in the case of an RSSI characteristic as shown in FIG. 8A, a value Vc obtained by adding β to the detected voltage value Vn is set as the threshold.

By the way, in the conventional receiver, once the threshold value for judging that there is a carrier is set, the threshold value is fixed to that value. Therefore, when the noise level around the receiver is changed and deteriorated, there is no carrier. Despite this, it is determined that there is a carrier and the receiving circuit shifts to the continuous receiving state.
The average current consumption has increased and the life of the battery has been shortened.

On the other hand, in the present embodiment, when the surrounding noise level is high, the above threshold value is large, so that the life of the battery 24 can be prevented from being shortened. Further, when the surrounding noise level is low, the threshold value becomes small, so that the communication area can be set wider.

The other operations are the same as those of the first embodiment. During the charging of the battery 24, the receiving circuit 22 operates continuously as in the first embodiment.

(Embodiment 6) The basic configuration of the rechargeable receiver of this embodiment is substantially the same as that of Embodiment 1, and in the receiver 2 shown in FIG.
Hn, CH2, CH3,..., And CHn, and the reception control circuit 23 detects a reception input level (the RSSI signal) within a receivable frequency band of the reception circuit 22 as a voltage value (not shown). And the charge detection circuit 2
7, while the charge detection signal sSe is being input.
In a state where the reception data signal sRe is not received, the channels CH1, CH2, CH3,.
Are periodically changed, and as shown in FIG. 9B, the detection voltage values corresponding to the reception input levels of the respective channels CH1, CH2, CH3,..., CHn are monitored, and the detection voltage values at this time (that is, , Noise level) is detected (in the RSSI characteristic as shown in FIG. 9A,
A channel having the smallest detection voltage Vn corresponding to the received power Pn is detected), the channel is displayed on the display unit 28 as a channel having the minimum noise, and a noise level difference from the current set channel is obtained to obtain the display unit. 28 is displayed. When the receiver 2 includes a sound output unit, the difference in noise level between the channel with the lowest noise level and the currently set channel may be reported by sound. By performing such notification, when the noise level difference between the currently set channel and the smallest channel is large, it is determined that there is a possibility that the same type of wireless device may be affected by channel interference. can do. Here, the display unit 28 and the sound output unit constitute a notification unit.

The other operations are the same as those of the first embodiment. During the charging of the battery 24, the receiving circuit 22 operates continuously as in the first embodiment.

(Embodiment 7) The basic configuration of a rechargeable receiver according to this embodiment is substantially the same as that of the first embodiment.
2, a plurality of channels CH1, CH2, CH3,..., CH
voltage detecting means (not shown) for detecting the reception input level (the RSSI signal) in the frequency band that the reception circuit 22 can receive as a voltage value
While the charge detection signal sSe from the charge detection circuit 27 is being input, the channel CH1 and CH2
2, CH3,..., CHn are sequentially changed periodically.
As shown in (b), each channel CH1, CH2, CH
The detected voltage value corresponding to the received input level for each of the channels 3,..., CHn is monitored (in the RSSI characteristic as shown in FIG. 10A, the channel with the smallest detected voltage Vn corresponding to the received power Pn is detected). ), The channel having the smallest detected voltage value (that is, the noise level) (CH in the example of FIG. 10B).
The detected voltage value of 3) and the currently used channel (FIG. 10)
In the example of (b), when the difference ΔV from the detected voltage value of CH1) exceeds a predetermined value ΔVth, the channel C with the minimum noise is used.
The feature is that the display is performed on the display unit 28 so as to change the channel to H3, thereby notifying the user. By performing such notification, the user can select a channel having a low noise level. Here, the display unit 2
8. The sound output means constitutes the notification means.

The other operations are the same as those of the first embodiment. During the charging of the battery 24, the receiving circuit 22 operates continuously as in the first embodiment.

[0055]

According to the first aspect of the present invention, there is provided a receiving means for receiving a transmission signal, which is a radio signal transmitted from a transmitter, and intermittently operating the receiving means to detect a transmission signal based on an output of the receiving means. Control means for continuously operating the receiving means to capture the data of the transmission signal; a rechargeable battery for supplying power to at least the receiving means and the control means; a determining means for determining whether or not the battery is being charged; When it is determined that the battery is not charging, the receiving means is operated intermittently until a transmission signal is detected, and when it is determined that the battery is being charged, the receiving means is continuously operated, When the battery is not being charged, the receiving means operates intermittently until a transmission signal is detected, so that the life of the battery can be extended, and the carrier is detected while the battery is being charged. Since the receiving means continuously operated perform standby reception without having an effect that it is possible to ensure the communication area corresponding to the reception sensitivity.

According to a second aspect of the present invention, in the first aspect of the present invention, a notifying unit for performing an external notification is provided, and the control unit detects a reception input level within a receivable frequency band of the receiving unit as a voltage value. A voltage detection unit that continuously monitors the detection voltage value while the determination unit determines that the battery is being charged, and allows the detection voltage value in a standby period when no transmission signal is received from the transmitter to be allowed. When the noise level exceeds a predetermined value set in accordance with the possible noise level, the notification is made by the notification means, so that when the surrounding noise level becomes high enough to hinder communication with the transmitter, the notification is made by the notification means. Therefore, there is an effect that the user can be encouraged to take appropriate processing such as changing the installation location.

According to a third aspect of the present invention, in the first aspect of the present invention, the control means has a voltage detection means for detecting a reception input level within a frequency band receivable by the reception means as a voltage value. While it is determined that charging is being performed, the detection voltage value is continuously monitored, and a value larger than the detection voltage value by the voltage detection unit in the standby period in which the transmission signal is not received from the transmitter by a specified value, When the receiving means is operated intermittently, it is set as a threshold value for determining that there is a carrier, so that the threshold value is set in accordance with fluctuations in the surrounding noise level. It is prevented that the presence of a carrier is determined by the influence of noise, and intermittent reception processing suitable for the surrounding environment is performed. There is an effect that it is.

According to a fourth aspect of the present invention, in the first aspect of the present invention, there is provided a notifying unit for performing an external notification, the receiving unit has a plurality of channels, and the control unit is provided with a frequency receivable by the receiving unit. A voltage detection unit for detecting a reception input level in the band as a voltage value, and while the determination unit determines that charging is being performed, periodically changes a channel of the reception unit and detects a detection voltage for each channel. Keep monitoring the values,
When the detected voltage value in the standby period in which no transmission signal is received from the transmitter exceeds a predetermined value set in accordance with the allowable noise level, the channel is notified by the notification means, so that the surrounding noise level is reduced. If the noise level exceeds an allowable noise level, the channel is notified by the notification unit, so that there is an effect that the user can be prompted to take an appropriate action such as a channel change or an installation location change.

According to a fifth aspect of the present invention, in the first aspect, the receiving means has a plurality of channels, and the control means comprises:
It has voltage detection means for detecting the reception input level within the receivable frequency band of the reception means as a voltage value, and periodically changes the channel of the reception means while the determination means determines that charging is in progress. To continuously monitor the detected voltage value of each channel, and intermittently operate the receiving means with each value larger than the detected voltage value of each channel by a specified value in a standby period in which a transmission signal from the transmitter is not received. Sometimes, the threshold value for determining the presence of a carrier is set for each channel, so that the threshold value for determining that a carrier is present changes in response to fluctuations in the surrounding noise level, and intermittent reception processing suitable for the surrounding environment is performed. This has the effect of preventing the life of the battery from being shortened due to noise.

According to a seventh aspect of the present invention, in the first aspect of the present invention, there is provided a notifying means for performing external notification, the receiving means has a plurality of channels, and the control means comprises a frequency receivable by the receiving means. A voltage detection unit for detecting a reception input level in the band as a voltage value, and while the determination unit determines that charging is being performed, periodically changes a channel of the reception unit and detects a detection voltage for each channel. Keep monitoring the values,
When the difference between the minimum detected voltage value and the detected voltage value of the currently used channel among the detected voltage values for each channel in the standby period in which the transmission signal is not received from the transmitter exceeds a predetermined value, Since the notification means notifies the user to change to the minimum channel,
Since a channel change to a channel having a lower noise level is encouraged, there is an effect that the user can select a channel having a lower noise level.

[Brief description of the drawings]

FIG. 1 shows the first embodiment, and is a schematic configuration diagram of a wireless system using a receiver.

FIG. 2 is an operation explanatory view of the above.

FIG. 3 is a flowchart for explaining the operation of the above.

FIG. 4 is an explanatory diagram of a usage pattern of the above.

FIG. 5 is an operation explanatory diagram of the second embodiment.

FIG. 6 is an operation explanatory diagram of the third embodiment.

FIG. 7 is an operation explanatory diagram of the fourth embodiment.

FIG. 8 is an operation explanatory diagram of the fifth embodiment.

FIG. 9 is an operation explanatory diagram of the sixth embodiment.

FIG. 10 is an operation explanatory diagram of the seventh embodiment.

FIG. 11 is an operation explanatory diagram of a conventional example.

FIG. 12 is a flowchart for explaining the above operation.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 transmitter 2 receiver 15 transmitting antenna 21 receiving antenna 22 receiving circuit 23 receiving control circuit 24 battery 25 power switch 26 charging circuit 27 charging detecting circuit

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Kazuhiro Matsumoto, Inventor Kazuma, Kazuma, Osaka 1048, Matsushita Electric Works, Ltd. Terms (reference) 5K061 AA02 BB12 DD00 DD04 EE01 EE10 EF11 5K067 AA43 BB02 EE02 EE10 GG11 KK06

Claims (7)

[Claims] 1. A receiving means for receiving a transmission signal, which is a radio signal transmitted from a transmitter, and a receiving means which operates intermittently and continuously operates when the transmitting signal is detected based on an output of the receiving means. Control means for capturing the data of the transmission signal, a rechargeable battery for supplying power to at least the reception means and the control means, a determination means for determining whether or not the battery is being charged, and a determination that the battery is not being charged by the determination means A rechargeable receiver characterized in that when it is determined, the receiving means is operated intermittently until a transmission signal is detected, and when it is determined that the battery is being charged, the receiving means is operated continuously. 2. An external notification means for performing external notification,
The control means has voltage detection means for detecting a reception input level within a frequency band that can be received by the reception means as a voltage value, and while the determination means determines that the battery is being charged, the detection voltage value is detected. The monitoring means continues to monitor, and when the detected voltage value in a standby period in which no transmission signal is received from the transmitter exceeds a predetermined value set according to an allowable noise level, the notification is made by the notification means. Item 1
A rechargeable receiver as described. 3. The control means includes voltage detection means for detecting a reception input level in a frequency band receivable by the reception means as a voltage value, and while the determination means determines that the battery is being charged, The detection voltage value is continuously monitored, and a value larger than the detection voltage value by the voltage detection means by the specified value in the standby period during which the transmission signal from the transmitter is not received is detected when the reception means is operated intermittently. 2. The rechargeable receiver according to claim 1, wherein the rechargeable receiver is set as a threshold value for judging that: 4. It has a notification means for performing external notification,
The receiving means has a plurality of channels, the control means has voltage detecting means for detecting a reception input level within a frequency band receivable by the receiving means as a voltage value, and the determining means determines that the battery is being charged. During this time, the channel of the receiving means is changed periodically to continuously monitor the detected voltage value for each channel, and the detected voltage value during the standby period when the transmission signal from the transmitter is not received is an acceptable noise level. 2. The rechargeable receiver according to claim 1, wherein the channel is notified by a notification unit when the value exceeds a predetermined value set according to. 5. The receiving means has a plurality of channels, and the control means has voltage detecting means for detecting a reception input level in a frequency band receivable by the receiving means as a voltage value,
While it is determined that the charging means is being charged, the channel of the receiving means is periodically changed to continuously monitor the detected voltage value of each channel, and during a standby period in which no transmission signal is received from the transmitter. 2. A rechargeable battery according to claim 1, wherein each value larger than the detected voltage value for each channel by a specified value is set as a threshold value for determining that there is a carrier when the receiving means is operated intermittently. Receiver. 6. An external notification means for performing external notification,
The receiving means has a plurality of channels, the control means has voltage detecting means for detecting a reception input level within a frequency band receivable by the receiving means as a voltage value, and the determining means determines that the battery is being charged. During this period, the channel of the receiving means is changed periodically to continuously monitor the detected voltage value of each channel, and the minimum of the detected voltage values of each channel in the standby period when no transmission signal is received from the transmitter. 2. The rechargeable receiver according to claim 1, wherein the difference between the detected voltage value of the channel for which the detected voltage value is obtained and the detected voltage value of the currently set channel is notified by the notifying means. 7. A notifying means for performing an external notification,
The receiving means has a plurality of channels, the control means has voltage detecting means for detecting a reception input level within a frequency band receivable by the receiving means as a voltage value, and the determining means determines that the battery is being charged. During this period, the channel of the receiving means is changed periodically to continuously monitor the detected voltage value of each channel, and the minimum of the detected voltage values of each channel in the standby period when no transmission signal is received from the transmitter. When the difference between the detected voltage value of the current channel and the detected voltage value of the currently used channel exceeds a predetermined value, the notification unit is notified of a prompt to change to the minimum channel. Item 7. A rechargeable receiver according to Item 1.