JP2006279670A - Cordless telephone and clock automatic backup method - Google Patents

Abstract

An object of the present invention is to automatically restore clock information after a power failure is eliminated by software processing.
When a slave unit receives a notification that the time is not set from the master unit, the slave unit transmits clock information held by the slave unit to the master unit, and the clock information transmitted from the master unit and the slave unit The clock information held is compared, and the clock information held by the slave unit is replaced with the clock information received from the master unit when the difference between the two clock information exists for a certain time or more. When the time is not set, the parent device sets the clock information of the parent device based on the clock information transmitted from the child device. Even when the clock information is lost in the parent and child device, the clock information is automatically exchanged between the parent and child devices after the power failure is eliminated to restore the clock information.
[Selection] Figure 3

Description

  The present invention relates to a cordless telephone and a timepiece automatic backup method including a parent device that is a telephone line and a child device that operates on a battery that communicates with the parent device using a wireless line.

  It is necessary to have an accurate clock inside the phone for time display. This timepiece is not only displayed on the answering machine, but also used as a stamp function for recording a message from the other party as a voice after the message is recorded.

  The clock information is meaningless if it is not accurate. However, once a power failure occurs, the timing is stopped or the information is erased, so the user has to redo the settings.

  Conventionally, in order to keep accurate clock information in the phone, as a power outage countermeasure, a backup battery is prepared only for the clock in the phone, or a separate low power consumption IC for the clock and a backup for it. This problem has been solved by using a large capacity capacitor.

  However, the need for a backup battery or a separate watch IC just for the watch has problems such as an increase in the backup battery and a rise in manufacturing price. As a solution relating to this problem, for example, a solution that can be measured only by a microcomputer part is known (Patent Document 1).

In the invention disclosed in (Patent Document 1), a power failure detection unit that detects the occurrence of a power failure and a clock counting unit that counts time are provided in the master unit, and the slave unit is configured to count time according to the instruction of the master unit. When the occurrence of a power failure is detected by the power failure detection unit of the main unit, the occurrence of a power failure and the time data of the clock counting unit at that time are transmitted to the slave unit based on this data The clock counter of the slave starts counting. When the power failure is restored, the clock information is transferred from the slave unit to the master unit, and the clock counting unit of the master unit is reset by the data of the clock counting unit of the slave unit.
Japanese Patent Laid-Open No. 10-93685

  However, the invention disclosed in (Patent Document 1) also requires a circuit for power failure detection and special processing at the time of power failure, and the slave side after the microcomputer detects power failure. There must remain power to send a power outage to. In addition, there is a problem in that accurate clock information is not retained unless the power failure detection is received by the slave unit.

  The present invention has been made in order to solve the above-mentioned problems. A cordless telephone that does not lose clock information even in the event of a power failure without using a special battery, IC, or circuit only for holding clock information. It is to provide.

  The present invention is a cordless telephone provided with a clock function in a master unit and a slave unit, and the slave unit receives clock information held by the slave unit to the master unit when receiving a notification that the time is not set from the master unit. The clock information transmitted from the master unit and the clock information held by the slave unit, and the clock information held by the slave unit when the difference between both clock information exists for a certain time or more. A control unit that replaces the received clock information with the clock information received from the base unit, the master unit transmitting the clock information held by the master unit to the slave unit on the control signal, and the master unit when the master unit is in a time unset state. Means for setting the clock information of the parent machine based on the clock information transmitted from the machine.

  The cordless telephone according to the present invention has substantially the same and accurate clock information between the parent and child devices, and the clock information of either the parent or child device is lost due to a power failure (for example, a power failure of the commercial power supply or a voltage drop of the battery of the child device). Even in such a case, the clock information can be automatically exchanged between the parent and child devices after the power failure is eliminated, and the clock information can be restored. Further, the clock information can be held only by the wireless information transmission / reception circuit and the software processing that are already provided in the cordless telephone, and it is possible to reduce the manufacturing cost by suppressing the incorporation of an extra circuit.

  The present invention, which has been made to solve the above problems, is a cordless telephone configured by a master unit having a clock function and a slave unit that communicates with the master unit through a wireless line and has a clock function. When receiving a notification that the time is not set from the parent device, the device transmits a clock information held by the child device to the parent device, a means for receiving the clock information transmitted from the parent device, The clock information transmitted from the master unit is compared with the clock information held by the slave unit, and the clock information held by the slave unit is received from the master unit when the difference between the clock information exists for a certain time or more. A control unit of the slave unit to be replaced with the master unit, wherein the master unit transmits to the slave unit the clock information held by the master unit, receives the clock information transmitted from the slave unit, When the time is not set, the slave unit And a control unit that sets the clock information of the parent machine based on clock information that is trust.

(Embodiment 1)
Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of a base unit of a cordless telephone according to the present invention, FIG. 2 is a block diagram showing the configuration of a handset of a cordless telephone according to the present invention, FIG. 1 is a base unit, and FIG. It is a block diagram which shows the structure of a machine.

  In FIG. 1, the master unit is centered on a control unit 2 that controls the operation of the entire master unit, a time counting unit 3 that counts clock information, a time storage unit 1 that stores the calculated time, clock information or Transmitter circuit 7 for transmitting a clock unset state notification to the slave unit, receiver circuit 5 for receiving clock information transmitted from the slave unit that has received the clock unset state notification, antenna 6 for transmitting / receiving, and power supply unit It is composed of four. The master unit operates with a commercial power supply (AC100V in Japan) including its clock function, and the power supply unit 4 supplies appropriate power to each unit in the master unit based on the power from the commercial power supply.

  The parent device periodically transmits a control signal to the child device, and transmits the clock information held by the parent device on the control signal. When the time is not set, the time storage unit 1 is set with an unset flag 1a indicating that the time is set. When the unset flag 1a is set, the master unit writes information indicating a clock unset state in the control signal and transmits it.

  In FIG. 2, the slave unit is centered on a control unit 9 that controls the entire slave unit, a time counting unit 11 that counts clock information, a time storage unit 8 that stores the measured time, and a clock from the master unit. A receiving circuit 12 for receiving information or a clock unset state notification, a time comparison unit 10 for comparing clock information received from the parent device with its own clock information, and when a clock unset state notification is received from the parent device 1 includes a transmission circuit 14 for transmitting clock information to the parent machine for setting the clock of the parent machine, an antenna 13 for transmission / reception, and a battery 15. The slave unit operates with power from the battery 15 including its clock function.

  FIG. 3 is a flowchart showing the control of the handset of the cordless telephone according to the present invention. Next, the control of the slave unit will be described with reference to FIG.

  First, when the power button of the slave unit is pressed and activated, the slave unit performs a continuous reception operation and searches for a control signal from the master unit (STEP 1). When a control signal is received from the parent device, a link is established with the parent device (STEP 2), and intermittent reception is started to enter a standby state. Normally, the master unit writes or sends clock information in the control signal at all times or periodically. However, if the master unit clock information is reset, the master unit displays a clock to the slave unit instead of the clock information. An unset state is notified (STEP 3).

  If the clock information is written as usual instead of the notification information indicating that the clock is not set in the control signal from the parent device, the child device receives the clock information transmitted from the parent device by the control signal (STEP 4). . At this time, if the clock information of the slave unit is in the reset state (STEP 5: YES), the clock information of the master unit received in STEP 4 is overwritten on its own clock information (STEP 6).

  When the clock information of the slave unit is not in the reset state and time keeping is continued (STEP 5: NO), the slave unit compares the received clock information of the master unit with the clock information held by the slave unit, The clock information is within a predetermined time width with respect to the clock information at that time of the slave unit (the clock information of the slave unit has not advanced by a predetermined time or delayed by a predetermined time with respect to the received clock information of the master unit) Whether or not to overwrite with the clock information from the parent machine.

  When the time is within the predetermined time range, that is, when the received clock information of the parent device is not advanced by more than one minute or not more than two minutes behind the clock information of the child device (STEP 7: NO), The clock information transmitted from is discarded (STEP 8). The timing of the handset can be continued.

  Further, when the time is out of the predetermined time range, that is, when the received clock information of the parent device is advanced by 1 minute or more or delayed by 2 minutes or more with respect to the clock information of the child device (STEP 7: YES). ) Overwrites the clock information of the parent device received in STEP 4 in the time storage unit 8 of the child device (STEP 9). Thereafter, the slave unit measures time based on the overwritten clock information (STEP 10). That is, the clock of the slave unit is corrected by the clock information transmitted from the master unit.

  In addition, when the slave unit receives a clock non-setting state notification from the master unit (STEP 3: YES), the slave unit transmits its own clock information to the master unit (STEP 11).

  FIG. 4 is a flowchart showing the control of the base unit of the cordless telephone according to the present invention. Next, based on FIG. 4, the control when the master unit returns from the power failure state and restarts will be described.

  When the parent device returns from the power failure state (STEP 1) and is restarted, the parent device starts periodic control signal transmission. However, the clock information before the power failure is lost in the time storage unit 1 of the parent device immediately after the recovery from the power failure, and the parent device is not set in the clock. At this time, an unset flag 1a indicating that the clock is not set is set in the time storage unit 1. Accordingly, the parent device writes notification information indicating that the clock is not set in the control signal and transmits the control signal (STEP 12), and notifies the slave device of the clock unset state instead of the clock information. As described above, when the slave unit receives the clock non-setting state notification from the master unit, the slave unit transmits its own clock information to the master unit.

  When receiving the clock information from the slave unit (STEP 13: YES), the master unit in the state where the clock is not set overwrites the received clock information of the slave unit in the time storage unit 1 of the master unit as its own clock information (STEP 14). After that, the master unit measures the time based on its own clock information, periodically writes its own clock information in the control signal, and transmits it to the slave unit (STEP 15).

  Next, how the parent device and the child device perform clock backup using the present invention will be described with reference to the sequence diagrams shown in FIGS.

  First, FIG. 5 is a sequence diagram at the time of clock backup after resetting handset clock information according to the present invention. The parent device transmits clock information on the control signal regardless of whether or not the link is established with the child device (STEP 20). When the slave unit returns to the operating state from the power failure state due to the completion of charging of the battery and establishes a link with the master unit (STEP 21), the clock information transmitted from the master unit thereafter is received. Since the clock information is reset and no setting is made when the slave unit is restored, when the clock information transmitted from the master unit is received, the clock information is overwritten on the own clock information (STEP 23). After that, the handset measures the time based on its own clock information.

  FIG. 6 is a sequence diagram at the time of clock backup after resetting the master clock information according to the present invention. Clock information is not transmitted at the time of power failure of the master unit, but the slave unit keeps timing based on its own clock information, so the time will not go wrong. After the parent device returns from the power failure state (STEP 24), since the clock information held by the parent device is reset, a clock non-setting state notification is transmitted to the child device instead of the clock information (STEP 25). The slave unit that has received the clock non-setting state notification transmits its own clock information to the master unit (STEP 26).

  At this time, if multiple slave units are connected to the master unit, all slave units that have received the master unit clock unset information notification have transmitted their own clock information to the master unit. If the slave unit is registered in multiple master units, one unit registered as the slave unit number “1” will be lost. In response to the reception of the clock non-setting state notification from the parent device, only the child device transmits the clock information of the child device to the parent device. At that time, the other slave units do not operate and keep timing with their own clock information.

  The master unit that has not received the clock information of the slave unit and has not yet set the clock overwrites the information as its own clock information (STEP 27). After that, the master unit measures the time based on its own clock information and periodically transmits its own clock information to the slave unit.

  FIG. 7 is a sequence diagram at the time of clock backup when a difference occurs in the clock information of the parent device and the child device according to the present invention. During normal operation, both the master unit and slave unit manage and clock their own clock information, and the master unit periodically broadcasts its own clock information to the slave unit ( (STEP 28).

  The slave unit that has received the clock information from the master unit compares the received clock information of the master unit with its own clock information, and the difference between the master unit clock information and the slave unit clock information is more than one minute. If it has not progressed or has not been delayed for more than 2 minutes, the clock information transmitted from the parent device is discarded, and time keeping is continued using the clock information held by the child device itself (STEP 29).

  If the clock information received from the parent device has been advanced for more than 1 minute or delayed by more than two minutes, the child device overwrites the received clock information of the parent device as clock information for the new child device, Keeps timing based on the overwritten clock information (STEP 30).

  As described above, even if the clock information of the main unit is lost due to a power failure, etc., or even if the clock information of the slave unit is lost due to battery replacement due to battery exhaustion, etc., time and effort is required to reset the clock information to the user. The clock information is automatically reset without bothering the user. In addition, as shown in FIG. 7, even when there is a difference in the clock information held by both the parent device and the child device, the clock information is automatically corrected, so that there is no significant shift in the clock information in the entire telephone system. , Can hold the same time.

  In the example shown here, when the clock information of the master unit is advanced by one minute or more from the clock information of the slave unit based on the reference for correcting the clock information of the master unit and the slave unit in FIG. Although it was when it was late, it does not stick to this and can be set arbitrarily.

  Further, in the example shown here, when a plurality of slave units can be registered in the master unit, the clock information held by the slave unit is transmitted to the master unit in response to the notification of the clock not set status of the master unit in FIG. Although it is assumed that only the slave unit registered as the unit number “1” is not limited to this, other than the slave unit that is linked first or the registered slave unit The slave unit with the smallest number and the slave unit number or the slave unit set by the user may be used.

  The present invention relates to a cordless telephone including a parent device that is used as a telephone line and a child device that operates on a battery that communicates with the parent device using a wireless line, and the power of the parent device is eliminated. Even if the battery of the slave unit runs out, if either the master unit or the slave unit is operating, use the clock information of the master unit or slave unit that is operating as a backup. Therefore, even if there is no power left to send clock information due to a sudden power failure without using a special battery, IC, or circuit for clock information, Can be held.

The block diagram which shows the structure of the main | base station of the cordless telephone by this invention The block diagram which shows the structure of the subunit | mobile_unit of the cordless telephone by this invention The flowchart which shows control of the subunit | mobile_unit of the cordless telephone by this invention The flowchart which shows control of the main | base station of the cordless telephone by this invention Sequence diagram during clock backup after resetting handset clock information according to the present invention Sequence diagram at the time of clock backup after resetting master clock information according to the present invention Sequence diagram at the time of clock backup when a difference occurs in the clock information of the parent device and the child device according to the present invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Time memory | storage part 2 Control part 3 Time counting part 4 Power supply part 5 Reception circuit 6 Antenna 7 Transmission circuit 8 Time storage part 9 Control part 10 Time comparison part 11 Time counting part 12 Reception circuit 13 Antenna 14 Transmission circuit 15 Battery

Claims (5)

A cordless telephone configured by a master unit having a clock function and a slave unit that communicates with the master unit through a wireless line and has a clock function,
The slave is
Means for transmitting clock information held by a slave unit to the master unit when receiving a notification that the time is not set from the master unit;
Means for receiving clock information transmitted from the master unit;
The clock information transmitted from the master unit is compared with the clock information held by the slave unit, and the clock information held by the slave unit is received from the master unit when a difference between both clock information exists for a certain time or more. Control means to replace with the clock information,
The base unit is
Means for transmitting clock information held by the parent device to the child device;
Means for receiving clock information transmitted from the slave unit;
A cordless telephone comprising: control means for setting clock information of the parent device based on clock information transmitted from the child device when the parent device is in a time unset state. 2. The cordless telephone according to claim 1, wherein the clock function of the base unit is operated by a commercial power source, and the clock function of the slave unit is operated by a battery. 2. The cordless telephone according to claim 1, wherein the base unit transmits clock information held by the base unit on a control signal transmitted periodically. A cordless telephone configured by a master unit having a clock function and a slave unit that communicates with the master unit through a wireless line and has a clock function,
The slave is
A first transmission circuit, a first reception circuit, a time storage unit that holds clock information, a time counting unit that counts clock information, and clock information that owns clock information received from the parent device A time comparison unit for comparison and a control unit;
The control unit, when receiving a notification that the time is not set from the base unit, transmits the clock information held by the slave unit to the base unit from the first transmission circuit,
When the time comparison unit receives the clock information transmitted from the parent device in the first receiving circuit, the clock information from the parent device is compared with the clock information held by the child device,
The control unit replaces the clock information held by the slave unit with the clock information received from the master unit when a difference between both clock information exists for a certain time or more,
The base unit is
A second transmission circuit, a second reception circuit, a time storage unit that holds clock information, a time counting unit that counts clock information, and a control unit,
The control unit causes the slave unit to transmit the clock information held by the master unit from the second transmission circuit, and when the master unit receives the clock information transmitted from the slave unit in the second reception circuit, A cordless telephone characterized in that, if the time is not set, the clock information of the parent device is set based on the clock information transmitted from the child device. An automatic clock backup method for a cordless telephone configured by a master unit having a clock function and a slave unit having a clock function while communicating with the master unit through a wireless line,
A clock automatic backup method for a cordless telephone configured by a parent device having a clock function that operates with a commercial power supply, and a slave device that communicates with the parent device through a wireless line and has a clock function that operates with a battery,
The base unit periodically transmits the clock information held by the base unit,
The slave unit compares the clock information with the clock information held by the slave unit when the clock information transmitted from the master unit is received. Replace the watch information held by the watch information received from the parent machine,
When receiving the notification that the time is not set from the parent device, the child device transmits the clock information held by the child device to the parent device,
An automatic clock backup method characterized in that, when the parent device receives clock information sent from the child device when the parent device is in a time unset state, the parent device sets the clock information of the parent device based on the clock information.

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