JPH04326214A - Cordless telephone set - 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 19 by a second communication channel set by calculating an identification code at a channel setting means 18 and since a hand set 19 to transmit the first communication channel can not execute communication with the base unit 12, a control means 22 of the hand set 19 executes ID exchange with the base unit 12 by the second channel calculated from the identification code by a channel setting means 26 and stored in 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 a first communication channel storage part 24 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 that selects and uses one channel from among a plurality of radio channels.

0002

2. Description of the Related Art Conventionally, cordless telephones have had a plurality of channels, from which one channel selected by the user is used for communication between a parent and a slave. In this case, a backup circuit is provided so that when the power to the base unit is disconnected or the batteries in the slave unit run out, the channel number that is currently being used is not forgotten.

The above-mentioned conventional example will be explained below with reference to the drawings. FIG. 3 is a block diagram of a conventional cordless telephone. 1 is a base unit connected to a telephone line, 2 is a receiving section, 3 is a transmitting section, 4 is a control means, 5 is a channel storage section, and 6 is a channel backup circuit. 7 is a slave unit that is connected to the base unit via wireless radio waves,
8 is a receiving section, 9 is a transmitting section, 10 is a control means, and 11 is a channel storage section. Note that in this conventional example, the radio channel used is channel N.

[0004] Next, the operation will be explained using the flowchart shown in FIG.
When the power of the base unit is disconnected during a call on a channel, the channel of the base unit is set to N by the channel backup circuit 6.
held in the channel. When the power is turned on again and a call is attempted, the control means 10 transmits the channel data indicating the currently used N channel and the identification code indicating that the handset 7 and the base unit 1 are a pair. In order to confirm that the communication channels used by the two devices are the same, the data is sent to the transmitter 9 as slave device confirmation data and transmitted to the base device 1 (STEP 2). The base unit 1 receives the slave unit confirmation data at the receiving unit 2 and transfers it to the control means 4. The control means 4 confirms that the channel data sent and the channel of the base unit 1 are the same channel based on the transferred slave unit confirmation data (STEP 3), and transmits the confirmed channel data and identification code as the base unit confirmation data. 3, and the transmitter 3 sends a reply to the handset 7 (STEP 4). The handset 7 receives the base unit confirmation data at the receiving unit 8 and transfers the received base unit confirmation data to the control means 10. You can confirm that it is the same call channel and you can talk (STEP 14)
).

[0005]

However, the above-described configuration has the problem that a backup circuit is required in the base unit, which increases the cost. Also, depending on the backup circuit, there is a limit to how long it can remember the channel in use when the main unit is powered off.
If you leave the device unplugged for a long time, you may lose information about the channels in use. After this, the base unit and the handset become unable to talk, and there is a problem in that they cannot return to a state where they can talk.

The present invention has been made to solve the problems of the prior art described above, and eliminates the need for a channel backup circuit, so that even if the main unit is turned off for a long period of time and then turned on again, it will not be connected to the slave unit until the last moment. The purpose of the present invention is to provide a cordless telephone that allows calls to be made using the call channel that was previously used between the parties.

[0007]

[Means for Solving the Problems] To achieve this object, the cordless telephone of the present invention includes an identification code means for identifying a base unit and a slave unit as a pair, and a communication channel for a selected channel. channel switching means for switching a second communication channel; first storage means for storing a first communication channel in use; channel setting means for determining a second communication channel using the identification code; The second communication channel is configured to include a second storage means for storing the second communication channel, a transmitting means for transmitting data, a receiving means for receiving data, and a control means for controlling the respective parts.

[0008]

[Operation] With this configuration, by memorizing the first communication channel in use in the slave unit and the second communication channel set based on the identification code, the first communication channel in use can be stored in the slave unit. If you forget your communication channel,
By exchanging confirmation data again using the second communication channel stored in the slave unit, the communication channel of the base unit becomes the first communication channel in use, and the communication channels of the slave unit and the base unit are matched. can be restored to normal condition.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS 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. 12 in Figure 1
is a base unit connected to a telephone line, 13 is a receiving unit,
14 is a transmitter, 15 is a control means, 16 is a channel switching means, 17 is a channel storage section, 18 is a channel setting means for determining the second channel by calculating an identification code, and 19 is connected to the base unit by radio waves. 20 is a receiving unit, 21 is a transmitting unit, 22 is a control means, and 23
24 is a first communication channel storage unit, 25 is a second communication channel storage unit, and 26 is a channel setting unit.

[0010] Regarding the cordless telephone comprising the above-mentioned components, their mutual relationship and operation will be explained below. Note that the first communication channel used in the cordless telephone of this embodiment is the N channel, and the second communication channel set by the identification code calculation is the A channel. Further, the second communication channel storage unit 2 of the handset 19
5 stores a second communication channel A that is set based on the result obtained by calculating the identification code by the channel setting means 26 using a predetermined method. As in the conventional example, the channel between base unit 12 and slave unit 19 is the first channel.
When the power of the base unit is turned off and then turned on again in the N channel of the communication channel of , the channel setting means 18 sets the second communication channel A using the identification code (STEP 1), The second communication channel A thus obtained is stored in the channel storage section 17 of the base unit 12. When attempting to talk in this state, the control means 22 of the handset 19 retrieves channel data indicating the N channel of the first communication channel currently in use from the first communication channel storage section 24, and combines this channel data with the handset 19. The transmitter 21 sends an identification code indicating that the device 19 and the parent device 12 are a pair as handset confirmation data to confirm that the communication channel used between the handset 19 and the parent device 12 is the same. and send it to the base unit 12 (STEP 2
). The base unit 12 receives the slave unit confirmation data at the receiving unit 13,
It is transferred to the control means 15. In this case, the channel of the base unit is the A channel of the second communication channel,
It is found 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 base unit 12 (STEP 5), and the base unit 12 and the slave unit 19
The channel data and identification code of the base unit confirmation data transmitted when it is confirmed that the base unit 12 and the slave unit 19 are on the same channel are not returned to the slave unit, and the communication channels are shifted and the base unit 12 and the slave unit 19 are unable to communicate.

On the other hand, if the channel data of the slave unit confirmation data transferred by the control means 15 is the same channel as the channel of the base unit 12 (STEP 3), the base unit confirmation data (channel N) is transmitted from the base unit to the slave unit. Reply (STE
P4), it becomes possible to talk (STEP 14).

If the channel of the base unit 12 and the channel of the slave unit 19 are different, after STEP 5, the control means 22 retrieves channel data indicating the second communication channel A from the second communication channel storage unit 25, Check the handset to confirm that the communication channel used between the handset 19 and the handset 12 is the same using this channel data and the identification code indicating that handset 19 and handset 12 are a pair. It is sent as data to the transmitter 21 and transmitted to the base unit 12 (STEP 6). The base unit 12 receives the slave unit confirmation data at the receiving unit 13 and transfers it to the control means 15. Control means 1
5 confirms that the channel data sent and the channel of the base unit 12 are the same channel based on the transferred handset confirmation data (STEP 7), and sends the confirmed channel data and identification code to the transmitter 14 as the base unit confirmation data. and the transmitter 14 sends a reply to the handset 19 (STEP 8)
. Here, if the channel data sent by the transferred handset confirmation data and the channel of the base unit 12 are not the same channel, an error is displayed (STEP 9) and a call cannot be made (STEP 10).

In STEP 8, when the handset 19 receives the base unit confirmation data from the base unit 12 at the receiving unit 20, it transfers the received base unit confirmation data to the control means 22, and the control unit 22 receives the base unit confirmation data. It can be confirmed that the slave unit 19 and the base unit 12 are on the same second communication channel.

Next, the control means 22 sends, from the first communication channel storage section 24, channel switching data indicating the N channel of the first communication channel that was being used before the main unit was powered off, to the transmission section 21. and send it to the base unit 12 (STEP 11), and channel switching means 23
The communication channel is switched to the first communication channel N channel (STEP 12). The base unit 12 receives channel switching data at the receiving unit 13 and controls the control unit 1.
Transfer the received data to 5. Based on the transferred received data, the control means 15 causes the channel switching means 16 to switch the channel to the N channel of the first communication channel (STEP 13). Here, the channel of the base unit 12 becomes the N channel of the first communication channel, and the channel of the base unit 12 becomes the N channel of the first communication channel.
, the communication channel of the handset 19 becomes channel N, which is the first communication channel before the main unit was powered off, and the communication becomes possible (STEP 14).

Although the communication channel is stored in the storage means in this embodiment, a counter means or the like is provided in place of the storage means, and by switching channels using the channel switching means, it is possible to make a call on the first communication channel. If not, change the channel to the second communication channel, use that channel to send and receive confirmation data between the child device and the parent device in the same way as in the previous embodiment, and use the second communication channel as control data. The same operation as in the previous embodiment is possible. Further, although the display means is used to display an error, a sound generation means or the like may be provided to generate a sound instead of displaying the error.

Furthermore, since the second communication channel is set based on the identification code, the second communication channel is not fixed to one, and various communication channels can be selected.

Furthermore, in the embodiment, the first and second channel storage sections are provided on the slave unit side, but by providing them on the base unit side or both, it is possible to prevent problems such as battery exhaustion on the slave unit side. It can also be used.

[0018]

As described above, the present invention provides an identification code means for identifying a base unit and a slave unit as a pair in a cordless telephone that is used by selecting from among a plurality of communication channels. channel switching means for switching a communication channel to a communication channel; first storage means for storing a first communication channel in use; channel setting means for determining a second communication channel using the identification code; A second storage means for storing the second communication channel set by the channel setting means, a transmitting means for transmitting data, a receiving means for receiving data, and a control means for controlling the respective parts. For example, if the base unit loses its previously used first communication channel information due to being unplugged for a long time, the second communication channel configured on the base unit and slave unit will be used. By exchanging confirmation data again, the channel of the parent device can be returned to the first communication channel stored in the child device, and the channels of the child device and the parent device can be matched and the normal state can be restored. It is also possible to reverse the positions of the parent and child, which prevents the communication channel status of the parent device and the child device from becoming misaligned and communication failure, which has a great practical effect.

[Brief explanation of drawings]

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

[Fig. 2] Flowchart common to one embodiment of the present invention and the conventional example

[Fig. 3] Block diagram showing the configuration of a conventional cordless telephone

[Explanation of symbols]

12 Base unit 13 Receiving section 14 Transmission section 15 Control means 16 Channel switching means 17 Channel storage section 18 Channel setting means 19 Child machine 20 Receiving section 21 Transmission section 22 Control means 23 Channel switching means 24 First communication channel storage unit 25 Second communication channel storage unit 26 Channel setting means

Claims (1)

[Claims] 1. A cordless telephone that uses a plurality of communication channels, comprising identification code means for identifying a base unit and a slave unit as a pair, and channel switching means for switching a communication channel to a selected channel.
a first storage means for storing a first communication channel in use; a channel setting means for calculating a second communication channel using the identification code; and a second communication channel set by the channel setting means. a second storage means for storing a communication channel, a transmitting means for transmitting data, a receiving means for receiving data; and control means for controlling each of the parts so as to return to the first communication channel after exchanging data on the first communication channel.