JP2512244B2 - Cordless phone - Google Patents

Abstract

PURPOSE:To simplify a circuit by eliminating a backup power source for channel storage at a base unit. CONSTITUTION:When the memory of a first channel during speaking is lost by the power failure, etc., of a base unit 12 and the power source is recovered, the base unit 12 executes transmission to a hand set 18 by a second communication channel set to a control part 15 in advance and since the hand set 18 to transmit the first communication channel can not execute communication with the base unit 12, a control means 21 of the hand set 18 executes ID exchange with the base unit 12 by the second channel set in advance at a second communication channel storage part 23. After the same second communication channel as the base unit 12 is confirmed, data for switching to the first channel to be next stored in the first channel storage part 23 are transmitted, the base unit 12 is switched to the first communication channel, and both base unit and hand set can return to the original first communication channel so as to enable speaking.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cordless telephone which selects and uses one channel from a plurality of wireless channels.

[0002]

2. Description of the Related Art Conventionally, a cordless telephone has a plurality of channels, and one channel selected by the user is used to communicate between the parent and child devices. In this case, a backup circuit is provided so that the channel number currently in use will not be forgotten immediately when the power of the parent device is disconnected or the battery of the child device runs out.

The above-mentioned conventional example will be described below with reference to the drawings. FIG. 3 is a block diagram of a conventional cordless telephone. Reference numeral 1 is a master unit connected to a telephone line, 2 is a receiving unit, 3 is a transmitting unit, 4 is control means, 5 is a channel storage unit, and 6 is a channel backup circuit. 7 is a child device connected to the parent device by radio wave,
Reference numeral 8 is a receiving unit, 9 is a transmitting unit, 10 is a control unit, and 11 is a channel storage unit. In this conventional example, the wireless channel used is the N channel.

Next, the operation will be described with reference to the flowchart of FIG. 2 as well. When the base unit 1 and the handset unit are talking on the N channel and the power source of the base unit 1 is cut off, the base unit 1 uses the channel backup circuit 6 The memory of the channel storage unit 5 is held in the N channel. When the power is turned on again and an attempt is made to make a call, the control means 10 of the slave unit 7 sends the channel data indicating the currently used N channel and the ID code indicating that the slave unit 7 and the master unit 1 are paired to the slave unit. Machine 7
In order to confirm that the communication channel used between the master unit 1 and the master unit 1 is the same, the transmitter unit 9 stores the slave unit confirmation data.
To the master device 1 (STEP 1). The master unit 1 receives the slave unit confirmation data at the reception unit 2 and transfers it to the control unit 4.
The control means 4 confirms that the channel data sent by the transferred slave unit confirmation data and the channel of the master unit 1 are the same channel (STEP 2), and transmits the confirmed channel data and ID code as master unit confirmation data. And sends it back to the handset 7 (STEP
3). The child device 7 receives the parent device confirmation data at the receiving unit 8 and transfers the received parent device confirmation data to the control means 10.
The control means 10 that has received the master unit confirmation data can confirm that the slave unit 6 and the master unit 1 are on the same communication channel, and the telephone call becomes possible (STEP 13).

[0005]

However, the above-mentioned configuration has a problem that the parent device needs a backup circuit and is expensive. Also, depending on the backup circuit, when the main unit is powered off, the time to remember the channel in use is limited,
If the power is left off for a long time, the channel information in use may be lost. After this, the base unit and the handset become incapable of calling, and there is a problem that the state where communication is possible cannot be restored.

In order to solve this, Japanese Patent Laid- Open No. 2-291
As shown in Japanese Patent No. 30, when the main unit returns,
Send a channel confirmation signal to the slave unit on a specific channel.
And if there is no response from the cordless handset, move to the next channel
Repeat the same operation, if there is a response on that channel
It is possible to restart communication with the child device, but this
By the way, the base unit, in the worst case, the cordless phone calls
All possible channels, on average all channels
Must send a channel confirmation signal for half of
Without a cordless phone with many channels
Takes a long time to resume the call
Become. The present invention has been made in view of the above problems.
No need for a backup circuit and immediately when the main unit returns
Providing a cordless phone that can resume calls with a handset
The purpose is to

[0007]

SUMMARY OF THE INVENTION The present invention has the above-mentioned conventional problems.
Multiple communication channels to resolve the
In cordless telephone for communicating with the machine, and the channel switching means for switching the communication channel to the channel selected, and that SL憶means to store the channel which is set in advance, when the communication from the base unit is interrupted,
Control the channel switching means and store in the storage means
Channel to the specified channel to communicate with the base unit.
After notifying the channel, change the channel switching means.
Control and communicate to the channel that notified the base unit.
And control means for switching the Yan'neru.

[0008]

The present invention has the above-mentioned configuration, and the master unit is
Channel and two channels of the channel specified by the cordless handset.
You can restart the call with the handset by making a call on the channel.
You will be able to

[0009]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of a cordless telephone according to an embodiment of the present invention. FIG. 2 is a flowchart showing the operation. In FIG. 1, reference numeral 12 is a base unit connected to a telephone line, 13 is a receiving unit, 14 is a transmitting unit, 15 is a control unit for controlling each unit based on a built-in program, 16 is a channel switching unit, and 17 is a channel. It is a storage unit. Reference numeral 18 is a slave unit connected to the master unit by radio waves, 19 is a receiving unit, 20 is a transmitting unit, 21 is control means for controlling each unit, 22 is a channel switching unit, and 23 is a first unit during a call. A first communication channel storage unit for storing the communication channel, and a second communication channel storage unit 24 for storing the preset second communication channel.

The mutual relation and operation of the cordless telephone having the above components will be described below.
The first communication channel used in the cordless telephone of this embodiment is the N channel, and the second communication channel is the D channel.

As in the conventional example, when the parent and child units are talking on the N channel of the first communication channel and the parent unit 12 is powered off, the parent unit does not have the channel backup circuit 6 of the conventional example this time. Of the 12 channels, the N channel of the first communication channel is not held. Again, base unit 12
When the power of the main unit 12 is turned on, the channel of the main unit 12 is controlled by
It becomes the D channel of the second communication channel set in the program built in the internal ROM etc.
The control means 21 of the first communication channel storage unit 23
Further, the channel data indicating the N channel of the first communication channel currently in use is taken out, and this channel data and the ID code indicating that the slave unit 18 and the master unit 12 are paired are used as the slave unit 18 and the master unit 12. In order to confirm that the communication channels used between the two are the same, the data is sent to the transmission unit 20 as the child device confirmation data and transmitted to the parent device 12 (STEP 1). The base unit 12 receives the handset unit confirmation data at the receiving unit 13 and transfers it to the control unit 15. In this case, the channel of the master unit is the D channel of the second communication channel, and it is understood that the channel data of the slave unit confirmation data transferred by the control means 15 is not the same channel as the channel of the master unit 12 ( STEP 4), the channel data and ID code of the master unit confirmation data transmitted when the master unit 12 and the slave unit 18 can be confirmed to have the same channel are not returned to the slave unit, and the communication channel is shifted and the slave unit 12 and the slave unit The machine 18 becomes unable to talk. Therefore, the control means 21
Retrieves the channel data indicating the second communication channel from the second communication channel storage unit 24, and obtains this channel data and the ID code indicating that the slave unit 18 and the master unit 12 are a pair, and the slave unit 18 and the master unit. In order to confirm that the communication channels being used between 12 are the same, the data is sent to the transmission unit 20 as slave unit confirmation data and transmitted to the master unit 12 (STEP 5). The base unit 12 receives the handset unit confirmation data at the receiving unit 13 and transfers it to the control unit 15. Control means 1
5 confirms that the channel data sent by the transferred slave unit confirmation data and the channel of the master unit 12 are the same channel (STEP 6), and the transmitting unit 14 uses the confirmed channel data and ID code as the master unit confirmation data. And the sending unit 14 sends a reply to the child device 18 (STEP
7). Here, when the channel data sent by the transferred slave unit confirmation data and the master unit 12 are not the same channel, an error is displayed by an error display means (not shown) (STEP 8), and the call cannot be made (STEP).
9). When the channels are the same, the child device 18 receives the parent device confirmation data at the receiving unit 19, transfers the received parent device confirmation data to the control unit 21, and the control unit 21 that receives the parent device confirmation data is the same as the child device 18. It can be confirmed that the base unit 12 and the second communication channel D are the same.

Next, the control means 21 of the child device 18 uses the first communication channel storage section 23 to display channel switching data indicating the N channel of the first communication channel used before the parent device 12 is powered off. Is transmitted to the base unit 12 (STEP 10), and the channel switching means 22 switches the communication channel to the N channel of the first communication channel (STEP 11).
The base unit 12 receives the channel switching data at the receiving unit 13 and transfers the received data to the control unit 15. Based on the received data transferred, the control means 15 switches the channel to the N channel of the first communication channel by the channel switching means 16 (STEP 12). Base unit 12 here
Becomes the N channel of the first communication channel, and both the communication channels of the master unit 12 and the slave unit 18 become the N channel of the first communication channel before the power of the master unit 12 is unplugged, and communication is possible (STEP 13 ).

Although the communication channel is stored in the storage means in the present embodiment, a counter means or the like is provided instead of the storage means, and the channel is switched by the channel switching means 22 so that the communication channel cannot be used. In this case, the currently used channel is changed to the second communication channel, and the confirmation data is transmitted / received between the child device and the parent device on the channel in the same manner as in the above embodiment, and the second communication channel is used as the control data. By using it, the same operation as that of the above-mentioned embodiment is possible.

Further, although the error is displayed by the display means, a sounding means may be provided and sounded instead of the display.

Further, in the embodiment, the first and second units are provided on the slave unit side.
Although the channel storage unit is provided on the parent device side or both of them, it is possible to cope with, for example, battery exhaustion on the child device side.

[0017]

According to the present invention, use of a plurality of communication channels
In cordless telephone for communicating with the master unit and a channel switching means for switching the communication channel to the channel selected, and that SL憶means to store a preset Ji Yan'ne <br/> Le, from the base unit Communication is interrupted
First, the channel switching means is controlled to control the storage means.
Move to the channel stored in and communicate with the base unit.
Switch the channel after notifying which channel to perform
To the channel that controlled the means and notified the base unit
Since it has a control means for switching the communication channel,
The base unit has the specified channel and the channel specified by the handset.
By communicating on the two channels of the channel
You will be able to resume talking, and
Resume calls even on cordless phones with many channels
It will not take a long time to do. Ma
In addition, the present invention allows the base unit to continue the call even if the power of the base unit is turned off.
Since there is no need to back up
Eliminates the need for a backup circuit, making it inexpensive and reliable
It is possible to resume the call with the child device.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a cordless telephone according to an embodiment of the present invention.

FIG. 2 is a flowchart common to one embodiment of the present invention and a conventional example.

FIG. 3 is a block diagram showing the configuration of a conventional cordless telephone.

[Explanation of symbols]

 12 parent unit 13 receiving unit 14 transmitting unit 15 control unit 16 channel switching unit 17 channel storage unit 18 slave unit 19 receiving unit 20 transmitting unit 21 control unit 22 channel switching unit 23 first communication channel storage unit 24 second communication channel Memory

Claims (8)

(57) [Claims] 1. A master unit using a plurality of communication channels
In cordless telephone that communicates, you store a channel switching means for switching the communication channel to the selected channel, nitrous et beforehand set Ji Yan'neru
When the memorize means, communication from the base unit is interrupted, the switch
The channel switching means is controlled to be stored in the storage means.
Channel to communicate with the base unit.
After notifying the channel, the channel switching means is controlled.
The communication channel to the channel for which the master unit was notified.
A cordless telephone having a control means for switching the channel . 2. A channel for communicating with a master unit is stored.
And a second storage unit that controls
When you move to the channel stored in the storage means,
The channel for communication to notify the
Characterized in that it is a channel stored in the means
The cordless telephone set according to claim 1. 3. A master unit using a plurality of communication channels
It consists of a slave unit that communicates and a master unit that communicates with the slave unit.
The slave unit will communicate on the selected channel.
The first channel switching means for switching
A first memory for storing the communication channel that has been set to be caulked
Means and the communication from the master unit is interrupted, the
The channel switching means is controlled to be stored in the storage means.
The communication channel to the specified channel,
To the channel after notifying the communication channel to
Controls the channel switching means to notify the master unit.
The first control to switch the communication channel to the selected channel
Control means, the master unit is connected to the selected channel.
Second channel switching to switch communication channel
Means and a memory stored in the first storage means of the slave unit.
A second memorizer that stores the same communication channel as the channel
And the second channel switching means at startup
Controlling the channel stored in the second storage means.
Switch the communication channel to, and on this communication channel
If there is a notification of the channel to communicate from the slave unit,
The second handset is controlled by controlling the second channel switching means.
Switch communication channel to the channel that was notified
Cordless characterized in that it is provided with a second control means
Telephone. 4. The slave unit is communicating with the master unit.
In addition to providing a third storage means for storing the channel,
The channel stored in the storage means by the first control unit.
Communication to notify the parent device when it moves to
The channel is a channel stored in the third storage means.
The cord according to claim 3, which is a channel.
Less phone. 5. A slave unit using a plurality of communication channels
On the cordless phone that communicates, the selected
Switch the communication channel to the channel
Memory and preset channels
When communication between the storage unit and the cordless handset is interrupted,
The channel switching means is controlled to be stored in the storage means.
Switch the communication channel to the
After notifying the channel to communicate, turn off the channel
The channel that controlled the replacement means and notified the slave unit.
Control means for switching the communication channel to the channel
A cordless telephone that features things. 6. A channel for communicating with a slave unit is stored.
And a second storage unit that controls
When you move to the channel stored in the storage means,
The channel for communication to notify the
Characterized in that it is a channel stored in the means
The cordless telephone set according to claim 5. 7. A master unit using a plurality of communication channels
It consists of a slave unit that communicates and a master unit that communicates with the slave unit.
And the master unit communicates to the selected channel.
The first channel switching means for switching
A first memory for storing the communication channel that has been set to be caulked
Means and the communication from the cordless handset is interrupted.
The channel switching means is controlled to be stored in the storage means.
The communication channel to the selected channel,
To the channel after notifying the communication channel to
Controls the channel switching means to notify the master unit.
The first control to switch the communication channel to the selected channel
Control means and the slave unit is connected to the selected channel.
Second channel switching to switch communication channel
Means and a memory stored in the first storage means of the master unit.
A second memorizer that stores the same communication channel as the channel
And the second channel switching means at startup
Controlling the channel stored in the second storage means.
To communication Chang Switch the channel, and on this communication channel
If there is a notification of the channel to communicate from the base unit,
Note that by controlling the second channel switching means,
Switch communication channel to the channel that was notified
Cordless characterized in that it is provided with a second control means
Telephone. 8. The master unit is communicating with the slave unit.
In addition to providing a third storage means for storing the channel,
The channel stored in the storage means by the first control unit.
Communication to notify the slave unit when it moves to
The channel is a channel stored in the third storage means.
The cord according to claim 7, which is a channel.
Less phone.