JP3011627B2 - Cordless telephone equipment - Google Patents

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 comprising a master unit connected to a telephone line and a slave unit wirelessly connected to the master unit.

[0002]

2. Description of the Related Art In recent years, with the spread of cordless telephone devices, two or more cordless telephone devices may be installed in a family.

In a domestic cordless telephone, two control channels and 87 communication channels are provided.
As disclosed in Japanese Patent No. 5826, first, a call request signal is transmitted to a base unit through a control channel, and if there is a response from the base unit, a call is made using an available call channel. .

[0004]

However, in the conventional cordless telephone device, when transmitting a signal on the control channel, the signal is always transmitted at the maximum output (10 mW). When two cordless telephone devices are installed and one of the cordless telephone devices has a remote connection with the parent device over a long distance (the signal received by the parent device is naturally attenuated by air propagation). ), When the cordless handset of the other cordless telephone device makes a call request on the base unit side of the cordless telephone device,
The call of one cordless telephone device will be damaged.

[0005]

A cordless telephone apparatus according to the present invention transmits a call request signal at a first transmission level when a call is requested from a slave unit to a base unit. The communication request signal is transmitted at a second transmission level higher than the first transmission level.

[0006]

According to the present invention, when a call is requested, a call request signal is first transmitted at a lower output than the maximum output, and when a response signal cannot be received in the transmission of the first call request signal, the call is retransmitted at the maximum output. .

[0007]

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

FIG. 1 is a block diagram of a cordless telephone apparatus according to the present invention, wherein (1) is a base unit connected to a telephone line (L) and a door phone (2), and (3A) and (3B) are base units (1). ) Wirelessly connected to the slave unit.

FIG. 2 shows a block diagram of the master unit (1).
(4) is a speech network circuit connected to the telephone line (L) and includes a 2-4 wire conversion circuit, a telephone line connection circuit, and the like. (5) is an incoming call detection circuit for detecting an incoming call,
(6) (7) is the first and second transmitting and receiving circuits, (8) is the first transmitting and receiving circuit.
A switching circuit connected to the second transmitting and receiving circuits (6) and (7), the speech network circuit (4), and the door phone (2);
The first and second transmission / reception circuits (6) and (7) are connected to the speech network circuit (4) or the door phone (2). (9)
Is a control circuit composed of a microprocessor, the first and second
Each circuit is controlled based on a control signal from the transmission / reception circuits (6) and (7), a reception level signal, a signal from the incoming detection circuit (5), and the like.

FIG. 3 is a block diagram of the slave unit (3A). (10) is a receiving circuit which converts the received signal into an amplifier (1).
Loudspeak at speaker (12) via 1). The receiving circuit (10) outputs a receiving level signal indicating the electric field strength of the receiving channel. (13) is a transmission circuit which inputs and transmits a signal from the microphone (14). (1
5) a transmission power control circuit for controlling the transmission power of the transmission circuit (13); (16) a numeric keypad (17);
8), a keyboard comprising a door phone key (19) and a cut-off key (20), a control circuit (21) comprising a microprocessor for controlling the whole child unit, and a control signal from the parent unit (1); ) Is controlled to transmit a control signal, a dial signal, and the like to the parent device (1) based on the key signal from the parent device (1). In addition, since the master unit (1) always transmits a signal with the maximum output, the control circuit (21) of the slave unit (3A) monitors the reception level signal to thereby establish a communication with the master unit (1). Can be determined.

The configuration of the slave unit (3B) is the same as that of the slave unit (3A) described above, and a description thereof will be omitted.

In the above configuration, the slave units (3A) and (3B)
The basic operation for an outside-line call request and a door-phone call request from the Internet will be described.

First, a call key (18) of one of the slave units
Is operated (here, the slave unit (3A) is operated), the control circuit (21) of the slave unit (3A) transmits an outside-line call request signal on the control channel. In response to this, the base station (1) transmits a response signal including an idle communication channel instruction signal, and when the mobile station (3A) receives the response signal, the base station (1) and the mobile station (3A) transmit the communication channel. To form a wireless line. In the master unit (1), when both the first and second transmission / reception circuits (6) and (7) are not used, the first transmission / reception circuit (6) is operated as described above, and the response signal is output. At the same time, the switching circuit (8) is controlled to connect the first transmitting / receiving circuit (6) to the speech network circuit (4),
In addition, the telephone line (L) is closed to allow outside line communication.

Next, the door phone key (1)
When 9) is operated, the control circuit (21) of the slave unit transmits a door phone call request signal on the channel. Thereafter, the process proceeds according to the same procedure as in the case of an outside line call. In this case, the switching circuit (8) connects the first transmitting / receiving circuit (6) and the door phone (2).

Further, for example, when one of the slave units (3A) is talking on an outside line or a door phone with the first transmission / reception circuit (6), the door phone key (19) or the talk key of the other slave unit (3B). When (18) is operated, signals are exchanged in the second transmission / reception circuit (7), and the second transmission / reception circuit (7) is connected to the door phone (2) or the speech network circuit (4). That is, at the same time, outside line communication and door phone communication can be performed.

Thus, according to the present invention, the control circuit (21) of the slave unit can be used for an outside line call or a door phone call.
When the off key (20) is operated, the reception level at that time is stored, and then the call termination processing is performed. Then, the call key (18) or the door phone key (19) is operated, and the outside line call request signal or the door phone call request is operated. When a signal is transmitted on the control channel, the transmission power control circuit (15) is controlled to perform the transmission processing at the transmission power corresponding to the stored reception level. To explain this point in more detail, if the stored reception level is high, a low transmission power is set, and if the stored reception level is low, a high transmission power is set. During the second, the request signal is repeatedly transmitted at the set transmission power. On the other hand, when the response signal from the master unit (1) cannot be received, the control circuit (21) of the slave unit determines that the master unit (1) cannot receive the request signal with the set transmission power. , Stop transmission for 0.2 seconds, and then transmit a request signal for 1 second at the maximum output transmission power. On the other hand, if the response signal from master device (1) can be received, the above-described processing is performed. If the response signal cannot be received, the process returns to the reception standby state. When a response signal is received in the transmission of the request signal for the first 1.3 seconds, the control circuit (21) of the slave unit controls the audio signal to be transmitted even on the communication channel at the set transmission power.

According to the above configuration, for example, when one of the slave units (3A) is away from the master unit (1) and talking on an outside line, the slave unit (3A) used on the side of the master unit (1) before the call (outside line). (Call or door phone call) When the other handset (3B) performs a door phone call at that position, the transmission power of the door phone call request signal is initially low, so that communication damage to one handset (3A) can be suppressed. it can.

Also, in the above situation, when the other handset (3B) performs a door phone call from a place distant from the base unit (1), the other handset (3B) receives a response signal because the initial transmission power is low. May not be able to be received, but since it is transmitted next at the maximum output transmission power, a wireless channel can be reliably formed. The same applies to the case where one slave unit (3A) is in a door phone call and the other slave unit (3B) makes an outside line call request.

The transmission power for the reception level at the end of the telephone call of the slave unit is set to the minimum level at which a wireless line can be formed when a call is requested at the position where the communication has been completed.

According to the present invention, as described above, the transmission power is changed according to the reception level. For example, one of the slaves (3A) is charged by a charger provided in the master (1) itself. With such a configuration, the initial transmission power may be set to a certain value that can form a wireless channel at that position.

Further, according to the configuration of the above-described embodiment, even when another cordless telephone device is installed or when each of the base units is located nearby, communication damage is suppressed as described above. be able to.

[0022]

Since the present invention is constructed as described above, when a call is requested, a call request signal is transmitted with a low output at first, so that the influence on other cordless telephone devices and the like is reduced. If a response signal cannot be received during the first transmission of a call request signal, the signal is retransmitted at a higher output, so that a wireless line can be reliably formed.
Furthermore, since the transmission level is initially determined based on the reception level in the previous communication, the transmission process suitable for the distance to the parent device can be performed unless the position of the child device is significantly changed from the previous time.

[Brief description of the drawings]

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

FIG. 2 is also a block diagram of a master unit.

FIG. 3 is a block diagram of the child device.

[Explanation of symbols]

 Reference Signs List 1 master unit 3A slave unit 3B slave unit 13 transmission circuit 15 transmission power control circuit 21 control circuit

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) H04B ⁷ /26-7/26 102 H04M 1/00 H04Q 7/00 -7/38

Claims (1)

(57) [Claims] 1. A cordless telephone device comprising a master unit and a slave unit wirelessly connected to the master unit, wherein the master unit transmits a response signal based on reception of a call request signal from the slave unit. In the above, at the time of a call request to the master unit, the slave unit is determined based on the reception level at the time of the previous communication.
Wherein the first of said transmit the call request signal at the transmission level, for transmitting the call request signal at a higher than said first transmission level second transmission level when can not receive the response signal at this time to be Cordless telephone device.