JPH0779484A - Cordless telephone set - Google Patents

Abstract

PURPOSE:To obtain a cordless telephone set in which no problem such as transmission intermodulation, strong input and reception inter-modulation takes place and the service life of a battery is extended when the battery is used for a power supply. CONSTITUTION:A radio section 11 of a master set 10 detects a reception electric field level RSSI of a radio signal sent from a slave set 30 and a control section 15 of the master set 10 checks whether or not the detected reception electric field level RSSI is larger than a reference level RL. When the reception electric field level RSSI is larger than the reference level RL, the control section 15 sends command information commanding the reduction of a transmission signal level to the slave set 30. The control section 15 of the slave set 30 controls the radio section 11 of the slave set 30 based on the command information to control a transmission output level to be decreased.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cordless telephone device having a master unit and a slave unit connected to the master unit by a wireless line, and more particularly to a cordless telephone unit for transmitting output of the slave unit or the master unit. The present invention relates to a cordless telephone device that is controlled based on a received electric field level detected by a handset or a handset.

[0002]

2. Description of the Related Art Conventionally, in this type of device, it is known that the receiver has an automatic gain adjusting function. Considering, for example, the case where the master unit receives the voice data transmitted from the slave unit, this device determines the reception electric field level (RS) depending on the distance between the master unit and the slave unit and the positions and directions of the two units.
Since SI) changes, the master side is provided with an automatic gain adjustment function, and the level of the audio data received by the master side is automatically adjusted.

However, in this configuration, no control is performed in the slave unit, and voice data is always transmitted from the slave unit at a constant level, for example, 80 mW.
As a result, the slave unit transmits voice data at a level higher than necessary, resulting in a waste of power consumption. In particular, considering that the slave unit is driven by a battery as a power source, this wasteful power consumption causes a problem that the battery life is shortened.

Further, when the slave unit transmits voice data at a level higher than necessary, when two or more such slave units approach each other, there is a problem of transmission intermodulation. When such a slave unit and a master unit are close to each other, problems such as strong input and reception intermodulation occur.

Such an inconvenience also occurs when the master unit is the transmitting side.

[0006]

As described above, in the conventional cordless telephone apparatus, the output control is not performed on the transmitting side, and the receiving electric field level on the receiving side is sufficiently higher than the required level. Also, it always outputs at a constant level.

Therefore, power consumption is wasted on the transmission side, and especially when the transmission side is driven by a battery as a power source, this wasteful power consumption causes a problem that the battery life is shortened.

Further, when voice data is transmitted at a level higher than necessary on the transmitting side, the problem of transmission intermodulation occurs when two or more transmitting side devices are close to each other, and further, the transmitting side device and When there is a position close to the receiving side device, there is a problem that problems such as strong input and reception intermodulation occur when there is.

Therefore, an object of the present invention is to provide a cordless telephone device in which problems such as transmission intermodulation, strong input and reception intermodulation do not occur, and when the battery is used as a power source, the battery life can be extended. And

[0010]

In order to achieve the above object, the present invention provides a cordless telephone apparatus comprising a master unit and a slave unit connected to the master unit by a wireless line, wherein the master unit is: A first reception electric field level detecting means for detecting a reception electric field level of a radio signal received from the slave unit;
When the received electric field level detected by the received electric field level detecting means is equal to or more than a predetermined value set in advance, a means for transmitting first instruction information for instructing to decrease the transmission output of the child machine to the child machine. It is characterized in that the slave unit is provided with a transmission output control means for reducing the transmission output of the slave unit in response to the reception of the first instruction information.

Further, according to the present invention, the slave unit detects a reception electric field level of a radio signal received from the master unit.
If the received electric field level detected by the receiving electric field level detecting means and the receiving electric field level detecting means is equal to or more than a predetermined value set in advance, a second instruction for instructing to lower the transmission output of the master unit. Means for transmitting information to the master unit, wherein the master unit further comprises transmission output control means for reducing the transmission output of the master unit in response to reception of the second instruction information. And

[0012]

According to the present invention, the first reception electric field level detecting means provided in the master unit detects the reception electric field level of the radio signal received from the slave unit, and the detected reception electric field level is a predetermined value set in advance. In the above case, the first instruction information for instructing to reduce the transmission output of the slave unit is transmitted to the slave unit,
The slave unit controls the transmission output control means to lower the transmission output of the slave unit in response to the reception of the first instruction information.

Further, the second reception electric field level detecting means provided in the slave unit detects the reception electric field level of the radio signal received from the master unit, and the detected reception electric field level is equal to or higher than a preset predetermined value. In this case, the master device transmits the second instruction information for instructing to reduce the transmission output of the master device, and the master device responds to the reception of the second instruction information by the transmission output control means, and the master device transmits the second instruction information. Control to reduce the transmission output of the machine.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a cordless telephone device according to the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram showing the overall configuration of an embodiment of a digital cordless telephone device to which the present invention is applied. The digital cordless telephone device includes a telephone line, an ISDN line and the like. The main unit 10 is connected to the general line network 50 by wire and a plurality of slave units 30 are wirelessly connected to the master unit 10.
Is connected to the base unit 10 via a wireless line.

FIG. 2 shows a structure of a main part of the base unit 10 shown in FIG. In FIG. 1, the base unit 10 is
The wireless unit 11 connected to the antenna 18, a control unit 15 including a microprocessor and the like, a peripheral circuit unit 16 including a modem, a baseband unit, a TDMA unit, a microphone, a receiver, and a battery (power supply) 17, Wireless unit 11
Includes a receiver 12, a transmitter 13, and a synthesizer 14.

In the configuration shown in FIG. 2, the receiving unit 12 of the radio unit 11 of the base unit 10 is, for example, the handset unit 30 shown in FIG.
When a wireless signal from the antenna is received via the antenna 18, the received electric field level RSSI is detected and the signal is received by the controller 15
Then, as will be described later, the control unit 15 transmits predetermined instruction information to the handset 30 based on the received reception electric field level RSSI.

FIG. 3 shows a structure of a main part of the slave unit 30 shown in FIG. Note that, in FIG. 3, portions having the same functions as those of the configuration of the master device 10 shown in FIG. 2 are denoted by the same reference numerals as those used in FIG. 2 for convenience of description, and duplicate description is omitted. In FIG. 3, the transmission unit 13
The detailed configuration of is shown.

That is, the transmitter 13 of the slave unit 30 includes an attenuator circuit 13 including a changeover switch 13a for switching between transmission and reception, a transmission side power amplifier 13b, an attenuator and the like.
c, a voltage changing unit 13d, and a changeover switch 1
In the state where 3a is connected to the transmission side S1, when the predetermined instruction information is received from the master device 10, the control unit 15 controls the voltage variable unit 13d to output the radio signal output from the transmission unit 13. It is configured to control the level. Here, the voltage varying unit 13d can be configured by using a so-called electronic volume that variably controls the resistance value according to the digital signal output from the control unit 15.

Next, the operation of this embodiment will be described with reference to FIGS.
This will be described with reference to the flowchart shown in FIG.

First, the processing procedure when the base unit 10 monitors the transmission level of the handset 30 will be described with reference to the flowchart of FIG. First, the control unit 15 of the base unit 10
Receives the reception electric field level RSSI of the wireless signal transmitted from the slave unit 30 detected by the wireless unit 11 of the master unit 10 (step 100). Then, in the following step 110, it is checked whether or not the detected reception electric field level RSSI is larger than the reference value RL, that is, whether or not RL <RSSI holds. Here, when RL <RSSI is established, in order to reduce the transmission output of the transmission unit 13 of the partner's handset 30, the instruction information for instructing to lower the transmission output level is sent (step 120).

On the other hand, if RL <RSSI is not established in step 110, then the detected RSSI is the reference value R.
It is checked whether it is smaller than L, that is, whether RL> RSSI holds or not (step 130). Where RL
When> RSSI is established, the instruction information for instructing to return the transmission output of the transmission unit 13 of the other handset 30 to the preset initial value, that is, the normal level is transmitted (step 140). The initial value in this case is a predetermined maximum level value within a range prescribed by law.

In step 130, RL> RSSI
If is not satisfied, the detected RSSI is equal to the reference value RL, so that new instruction information is not sent to the transmitting side child device 30 and the continuation of the transmission output level is requested until then.

Next, it is checked whether or not the call is continued (step 150). If the call is continued, the processes of step 100 and the following steps are repeated again, and when the call is over, this process is ended.

Next, the processing procedure of the slave unit 30 when the above-mentioned instruction signal from the master unit 10 is received will be described with reference to the flowchart of FIG.

In this process, first, the control unit 1 of the child device 30
5 checks whether or not the instruction information from the base unit 10 is received (step 200). If the instruction information is received from the parent device 10, it is then checked whether the received instruction information is an instruction to lower the transmission output level (step 210).
When the instruction information is an instruction to lower the transmission output level, the control unit 15 of the handset 30 controls the voltage varying unit 13d of the transmission unit 13 to lower the transmission output level of the wireless signal output from the transmission unit 13. Control (step 22)
0).

On the other hand, if the received instruction information is not an instruction to lower the transmission output level, then it is checked whether or not the received instruction information is an instruction to restore the transmission output level to the normal transmission output level (step 230). . Here, when it is determined that the received instruction information is an instruction to restore the transmission output level to the normal transmission output level, the control unit 15 of the handset 30 controls the voltage variable unit 13d of the transmission unit 13, The transmission output level of the radio signal output from the transmission unit 13 is controlled to return to the normal transmission output level (step 240).

When it is determined in step 230 that the received instruction information is not an instruction to restore the transmission output level to the normal transmission output level, the control unit 15 of the handset 30 changes the voltage of the transmission unit 13 by changing the voltage. The unit 13d is not controlled, and the transmission output level up to that point is maintained.

Next, it is checked whether or not the call is continued (step 250). If the call is continued, the processes of step 200 and thereafter are repeated again, and when the call is over, this process is ended.

As described above, in this embodiment, the base unit 10 detects the reception electric field level RSSI of the radio signal transmitted from the handset 30, and the detected reception electric field level RSS.
When I is larger than the predetermined value, the handset 30 transmits the instruction information for instructing to reduce the output of the transmission signal. On the other hand, when the handset 30 receives the instruction information, the handset 30 controls the transmitter 13 to transmit the information. Since it controls to lower the output level,
The transmission output level on the transmission side does not increase more than necessary, so that the power consumption of the child device 30 can be reduced and the life of the battery 17 of the child device 30 can be extended.

In the above embodiment, the case has been described where the slave unit 30 is the voice data transmitting side and the master unit 10 is the voice data receiving side. However, the master unit 10 is the voice data transmitting side. Therefore, the same control can be performed when the child device 30 is the receiving side of the audio data.

In this case, the slave unit 30 has the configuration shown in FIG. 2 and the master unit 10 has the configuration shown in FIG. 3, and the slave unit 30 receives the radio field level RSSI of the radio signal from the master unit 10. Is detected, and when the detected reception electric field level RSSI is larger than a predetermined value, instruction information for instructing the base unit 10 to lower the transmission output level is transmitted, and the base unit 10 lowers the transmission output level. When the instruction information for instructing is received, the transmitting unit 13 of the master device 10 is controlled to control the transmission output level from the master device 10 to be lowered.

When the reception electric field level RSSI detected by the slave unit 30 is larger than a predetermined value, the master unit 10 is transmitted with the instruction information for instructing to restore the transmission output level to the normal transmission output level, When the master device 10 receives the instruction information for instructing to restore the transmission output level to the normal transmission output level, the master device 10 controls the transmitter 13 of the master device 10 to transmit the transmission output level from the master device 10 to the normal transmission. Control to return to the output level.

When the reception electric field level RSSI detected by the slave unit 30 is equal to the predetermined value, the instruction information is not transmitted to the master unit 10, and in this case, the master unit 10 controls the transmission unit 13. Is maintained and the transmission output level up to that point is maintained.

As a result, the transmission output level on the transmission side does not increase more than necessary, so that problems such as transmission intermodulation and strong input and reception intermodulation can be avoided.

[0036]

As described above, according to the present invention, the receiving side detects the receiving electric field level detecting means for detecting the receiving electric field level of the radio signal transmitted from the transmitting side and the receiving electric field level detecting means. When the received electric field level is higher than a predetermined value, the transmitting side is instructed to reduce the output of the transmitting signal, and the transmitting side is configured to lower the transmitting output level of the transmitting side when receiving this instruction. It is possible to reduce the power consumption in, and for example, when the slave is on the transmitting side, the life of the battery of the slave can be extended.

Further, since the transmission output level on the transmission side does not increase more than necessary, it is possible to avoid the problems of transmission intermodulation and strong input and reception intermodulation.

[Brief description of drawings]

FIG. 1 is a block diagram showing the overall configuration of an embodiment of a cordless telephone device to which the present invention is applied.

FIG. 2 is a block diagram showing a configuration of a main part of a base unit in the cordless telephone device shown in FIG.

3 is a block diagram showing a configuration of a main part of a cordless handset in the cordless telephone device shown in FIG.

FIG. 4 is a flowchart showing a processing procedure of a parent device shown in FIG.

FIG. 5 is a flowchart showing a processing procedure of the child device shown in FIG.

[Explanation of symbols]

 10 Master Unit 30 Handset Unit 11 Radio Unit 12 Receiver Unit 13 Transmitter Unit 13a Changeover Switch 13b Transmitter Power Amplifier 13c Attenuator Circuit 13d Voltage Variable Unit 14 Synthesizer Unit 15 Control Unit 16 Peripheral Circuit Unit 17 Battery 18 Antenna

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location H04M 1/00 N

Claims (2)

[Claims] 1. A cordless telephone device comprising a master unit and a slave unit connected to the master unit by a wireless line, wherein the master unit detects a reception electric field level of a radio signal received from the slave unit. A first reception electric field level detecting means, and a first instruction to decrease the transmission output of the slave unit when the reception electric field level detected by the first reception electric field level detecting means is equal to or more than a preset predetermined value. And means for transmitting the instruction information of the slave unit to the slave unit, wherein the slave unit includes a transmission output control unit for reducing the transmission output of the slave unit in response to the reception of the first instruction information. Characteristic cordless telephone device. 2. The slave unit includes a second reception field level detection unit that detects a reception field level of a radio signal received from the master unit, and a reception field level detected by the second reception field level detection unit. Is greater than or equal to a predetermined value set in advance, means for transmitting to the master unit second instruction information for instructing to lower the transmission output of the master unit, the master unit, the second unit 2. The cordless telephone device according to claim 1, further comprising transmission output control means for reducing the transmission output of the master unit in response to reception of the instruction information.