JP3018724B2 - Cordless telephone equipment - Google Patents

Abstract

PURPOSE:To provide a cordless telephone system in which connection time of slave sets can be reduced, and also, the depletion of a battery is suppressed by reducing the power consumption of a master set, and furthermore, the working range of the slave set can be expanded without limiting to the arrival range of a wave from the master set. CONSTITUTION:This system is set up in such a way that reception circuits 17, 18 which receive the signal from another slave set are provided at each slave set, and the transmission/reception of information among the slave sets are performed. Also, it is made in such a way that a switch which switches the transmission and reception of the slave set is provided at each of the antennas 4, 8 of each slave set, which enables speech to be performed among the slave sets without routing through the master set.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a low power cordless telephone.

[0002]

2. Description of the Related Art First, a conventional technique will be described. Conventionally, the slave unit has a receiving circuit of 380 MHz band and 254M band.
It has a transmission circuit in the Hz band. FIG. 3 shows a system configuration of such a conventional low power type cordless telephone.

[0003] In FIG. 3, regarding a slave unit 1, 1 is a control unit, 2 is a receiving circuit for receiving a signal from the master unit, 3
Is a transmission circuit, and 4 is an antenna.

Similarly, with respect to the slave unit 2, 5 is a control means,
Reference numeral 6 denotes a receiving circuit for receiving a signal from the master unit, 7 denotes a transmitting circuit, and 8 denotes an antenna.

Next, regarding the master unit, 9 is a control means, 10 is a communication circuit, 11 is a receiving circuit for RF1, 12 is a transmitting circuit for RF1, 13 is an antenna, 14 is a receiving circuit for RF2, 1
5 is an RF2 transmitting circuit, and 16 is an antenna.

The operation of the conventional circuit when making a call between slave units will be described.

First, when a call is made for a call between handset units in the handset unit 1, it is determined whether or not the control channel is free, and then the control unit 1 generates call data on the control channel and transmits the data. A call command is transmitted to the parent device via the circuit 3 and the antenna 4 through the control channel. The base unit receives and decodes the call command through the antenna 13 and the reception circuit 11 and performs carrier sense in the control unit 9 to generate data for specifying a communication channel detected as being free. And the transmission circuit 1
2. The data is transmitted to the child device 1 through the antenna 13, and after transmitting the data, the parent device changes the control channel to the designated communication channel. The slave 1 that has received the channel data specified by the master through the antenna 4 and the receiving circuit 2
The control means 1 uses the channel after determining that the channel is not used. As a result, a channel used between the slave unit 1 and the master unit RF1 when performing a call between the slave units is set.

Next, the setting of the channel used between the slave unit 2 and the master unit RF2 will be described. Slave unit 1 and master unit RF1
At the stage when the channel setting is completed, the control means 9 carries out carrier sense except for the channels used in the slave unit 1 and the master unit RF1, and thereby the data designating the communication channel that has been detected as being empty, The signal is transmitted to the slave unit 2 through the transmission circuit 15 and the antenna 16.

In the slave unit 2, after receiving and decoding the data on the channel from the master unit through the antenna 8 and the receiving circuit 6, the control means 5 confirms that the designated channel is not used. Use that channel above. When the channels used by the child device 1 and the parent device RF1 and the child device 2 and the parent device RF2 are determined, the R of the parent device is determined.
F1 and RF2 are connected, and the procedure for making a call between slave units is completed.

In a conventional cordless telephone,
As described above, in order to perform a call between slave units, the transmission frequency (254 MHz band) and the reception frequency (380 MHz) of the slave unit are used.
Band), the call was made using two sets of RF1 and RF2 mounted on the base unit within a range where the radio of the base unit could be reached.

[0011]

However, in the above-mentioned conventional cordless telephone device, when a call is made between slave units, the master unit first performs carrier sense, sets a channel between the RF1 and the slave unit 1, and then re-establishes a channel. Carrier sensing was performed, and the channel of RF2 and the slave unit 2 was set, and then the stage of connecting RF1 and RF2 was performed. Therefore, the child device 1 and the child device 2
In addition, when the connection time is long and the load on the master unit is large and a power outage or the like occurs, there is a problem that the power consumption is increased and the backup battery is quickly consumed.

Also, since the transmission and reception frequencies are different,
When making a call between slave units, it must be done via the base unit,
There is also a problem that the use range of the slave unit is limited to a range where radio waves from the master unit can reach.

The present invention solves the above-mentioned conventional problems, shortens the connection time between slave units, reduces the power consumption of the master unit, suppresses the rapid consumption of the battery, and It is another object of the present invention to provide a cordless telephone device capable of widening the range of use of a child device without being limited to a range where radio waves can reach from the parent device.

[0014]

According to the present invention, in order to achieve the above object, a receiving circuit for receiving a signal of another slave unit is provided in each slave unit, and information is transmitted and received between the slave units. .

Further, a switch for switching between transmission and reception of the child device is provided in the antenna of each child device so that a call can be made between the child devices without passing through the parent device.

[0016]

According to the present invention, since the slave unit performs the carrier sense of the master unit during the call between the slave units, the connection time can be reduced and the burden on the master unit can be reduced. Power consumption can be reduced, and the duration of the backup battery can be prolonged during a power failure.

Further, there is no need to go through the master unit, and a call can be made between the slave units at any place. Further, it is also possible to make an extension call between another child device 1 and the parent device via an arbitrary child device.

[0018]

1 shows a cordless telephone apparatus according to the present invention.

In FIG. 1, the structures denoted by reference numerals 1 to 16 are exactly the same as the structure of the conventional example shown in FIG. 3, and the description thereof is omitted.

Reference numerals 17 and 18 denote receiving circuits for receiving signals from other slave units. As an embodiment of the present invention, a description will be given of a connection operation method when the slave unit 1 and the slave unit 2 perform a call between the slave units.

When the handset 1 makes a call for making a call between the handset , the receiving means 2 indicated by numeral 17 determines whether or not the control channel is free, and the control means 1 uses the control circuit 1 to make a call on the control channel. Call data is generated, and a call command is transmitted to the slave unit 2 through the transmission circuit 3 and the antenna 4 via the control channel.

[0022] The handset 2, receiving indicated by the antenna 8, number 18
By receiving and decoding a call command through the communication circuit 2 and performing carrier sense in the control means 5,
After generating data designating a communication channel detected as being vacant, the transmission circuit 7 and the antenna 8 transmit data relating to the channel to the slave 1.

After the slave unit 2 transmits the channel data to the slave unit 1, the control unit 5 searches for a vacant channel other than the channel used by the slave unit 1, and sets the channel used by the slave unit 2 itself. In this way, with the channels used by the handset 1 and the base unit RF1 and the handset 2 and the base unit RF2 set, the data of the used communication channel is transmitted to the base unit.

Data on the communication channel to be used is
The master unit, which receives the signal through the antenna 13 and the receiving circuit 11 by RF1, and receives the signal through the antenna 16 and the receiving circuit 14 by RF2, changes RF1 and RF2 to the designated communication channels, and connects the RF1 and RF2 to each other. A call can be made between calls.

FIG. 2 is a block diagram of the slave unit. As shown in FIG. 2, reference numeral 4 denotes a receiving circuit 2 for receiving a signal of another slave unit.
It is. In such a receiving circuit 2, by providing the switch 6 for switching between the transmitting and receiving antennas 4, it is possible to communicate as a transceiver between the slaves without passing through the master at all. That is, the switch 6 is set to A when transmitting, and the switch 6 is set to B when receiving.
Set to. With such a structure, the slave unit can have both a function as a telephone and a function as a transceiver.

First, a description will be given of the operation when a call is made between the slave units by switching the switches.

Normally, the changeover switch of the antenna of the slave unit is set to the position B, so that the slave unit is always in the receiving state.

In FIG. 2, when the antenna switch is set to A and the transmission state is set, and the slave unit makes a call for a call to another slave unit, the control means 1 causes the control means 1 to set a vacant communication channel. Is transmitted through the transmitting circuit 3 and the antenna 5 and then the communication channel is determined to be empty. On the other handset, when receiving the data on the vacant channel, the call as the transceiver is enabled by changing to the designated call channel.

[0029]

As will be understood from the above embodiments, the following effects can be obtained.

When a call is made between the slave units, a receiver circuit for receiving the signal of the slave unit is mounted on the slave unit itself, so that the slave unit plays a role of setting channels by carrier sense performed by the master unit. It is possible to take over, and the channels to be used for the handset 1 and RF1 and for the handset 2 and RF2 can be set almost simultaneously, so that the connection operation can be simplified and the connection time can be shortened. In addition, when a power failure or the like occurs, the power consumption of the master unit can be reduced, so that unnecessary consumption of the backup battery can be prevented.

Further, by providing the antenna with a switch for switching between transmission and reception, the slaves can be used as transceivers, and the range of use of the slaves is widened.

[Brief description of the drawings]

FIG. 1 is a block diagram of a system configuration of a cordless telephone device according to the present invention.

FIG. 2 is a block diagram of a slave unit in FIG. 1;

FIG. 3 is a block diagram of a system configuration of a conventional cordless telephone device.

[Explanation of symbols]

 1,5 slave unit control means 2,3,4,6,17,18 slave unit receiving circuit 3,7 slave unit transmission circuit 4,5,8 slave unit antenna 9 master unit control means 10 speech circuit Reference Signs List 11 RF1 receiving circuit 12 RF1 transmitting circuit 13 RF1 antenna 14 RF2 receiving circuit 15 RF2 transmitting circuit 16 RF2 antenna

Claims (1)

(57) [Claims] 1. A cordless telephone device comprising a master unit connected to a telephone line and a slave unit connected wirelessly, wherein a signal from a transmission circuit of another slave unit is transmitted to each slave unit. Specialty to receive
A receiver circuit is provided for
A cordless telephone device characterized in that the channel setting by the user is performed by the slave unit.