JPH04287433A - Cordless telephone set - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention consists of a base unit connected to a telephone line, and a slave unit connected to the base unit via a wireless line. The present invention relates to a cordless telephone having a function of controlling the strength of radio waves to be transmitted according to the strength of received radio waves so that communication can be performed using the electric power of .

0002

2. Description of the Related Art An example of the circuit configuration of a base unit and a slave unit of a conventional cordless telephone is shown in FIGS. 3 and 4.

In FIG. 3, an interface circuit 32 that performs a communication interface is connected to a telephone line 31, and the output of the interface circuit 32 is sent via an amplifier circuit 34 to a signal modulation circuit 36 to which an antenna 38 is connected. It is connected to the.

The antenna 38 also includes a signal demodulation circuit 35.
The output of the signal demodulation circuit 35 is connected to the input of the interface circuit 32 via the amplifier circuit 33.

[0005] Furthermore, the control circuit 37 that controls the operation of the entire base unit, the signal demodulation circuit 35, and the signal modulation circuit 36 are each bidirectionally connected.

The control circuit 37 includes a microcomputer section (ROM, R
Including AM, I/O, etc. ), a control section for each block, a transmission data section, a reception data section, a key input section, etc.

In FIG. 4, the input of a signal demodulation circuit 42 and the output of a signal modulation circuit 43 are connected to an antenna 41 that transmits and receives signals to and from a base unit, and the output of the signal demodulation circuit 42 is , the earpiece 46 via the amplifier circuit 44
It is connected to the.

Furthermore, the output of the microphone 47 is transmitted to an amplifier circuit 45.
It is connected to the input of the signal modulation circuit 43 via.

Furthermore, the control circuit 48 that controls the operation of the entire slave device, the signal demodulation circuit 42, and the signal modulation circuit 43 are each bidirectionally connected.

The control circuit 48 includes a microcomputer section (ROM, R
Including AM, I/O, etc. ), a control section for each block, a transmission data section, a reception data section, a key input section, etc.

The operation of the conventional cordless telephone having the above configuration when receiving a call will be explained.

When a call signal is sent from the other party (not shown) through the telephone line 31, the base unit detects the arrival of the call signal, connects the base unit to the telephone line 31, and controls the control circuit 37 of the base unit to output the signal. Demodulation circuit 35 and signal modulation circuit 36
and operate.

On the other hand, in the slave device, a control circuit 48 is activated by radio waves from the control channel from the parent device, and the control circuit 48 operates the signal demodulation circuit 42 and the signal modulation circuit 43.

[0014] As a result, the base unit and the slave unit are connected through the same communication channel.

Thereafter, the voice signal from the other party sent through the telephone line 31 is sent to the interface circuit 32.
The signal is guided to the amplifier circuit 34, where it is amplified to a level necessary for communication, and then provided to the signal modulation circuit 36. The signal modulation circuit 36 modulates the carrier signal with this audio signal and transmits it from the antenna 38 to the handset side.

In the handset, this transmitted radio wave is received by the antenna 41, demodulated into the original audio signal by the signal demodulation circuit 42, and then amplified by the amplifier circuit 44 to the level necessary for driving the earpiece 46. Emit as audio.

The audio signal input from the microphone 47 of the handset is amplified by the amplifier circuit 45 to a level necessary for transmission, and then provided to the signal modulation circuit 43. The signal modulation circuit 43 modulates the carrier signal with this audio signal and transmits it from the antenna 41 to the base unit side.

In the base unit, this transmitted radio wave is received by the antenna 38, demodulated into the original audio signal by the signal demodulation circuit 35, and then amplified by the amplifier circuit 33 to the level necessary for transmission. Send on 31.

In this series of operations from receiving a call to making a call, the signal modulation circuit 36 of the base unit and the signal modulation circuit 43 of the slave unit are controlled by control circuits 37 and 48 to comply with the Radio Law concerning cordless telephones. Transmission is performed using the specified maximum power.

[0020] As described above, since conventional cordless telephones always communicate at maximum power, there is a possibility of eavesdropping, and also, for cordless telephones that operate on rechargeable batteries, battery consumption is rapid. There was a problem that the call time was shorter than necessary.

Recently, in order to solve this problem, the transmission power of the other party is constantly monitored between the base unit and the slave unit, and the strength of the radio waves to be transmitted is adjusted depending on the strength of the radio waves from the other party. Cordless telephones have been provided that have a function to control the noise level (for example, Japanese Patent Application Laid-Open No. 62-30426).

[0022]

[Problem to be Solved by the Invention] However, in the above-mentioned cordless telephone equipped with a function to control the strength of the radio waves transmitted according to the strength of the radio waves from the other party, when a call is made from the handset or base and when receiving a call from a telephone line,
Since the strength of the radio waves is controlled to the minimum necessary, for example, even if there is slight interference from radio waves from another cordless phone while the base unit and slave unit are communicating on the control channel, the line connection will be maintained. There was a problem that made it impossible to do so.

[0023] The present invention was made in view of the above-mentioned circumstances, and its purpose is to perform communication at maximum power during the line connection control stage before transitioning to a call, and to use the minimum power necessary during a call between the handset and an outside line. An object of the present invention is to provide a cordless telephone that performs communication using the electric power of 1000 yen, thereby stabilizing line connection control and reducing power consumption.

[0024]

[Means for Solving the Problems] In order to solve the above problems, the cordless telephone of the present invention includes a base unit connected to a telephone line, and a slave unit connected to the base unit via a wireless line. The base unit and the slave unit are equipped with a function of controlling the strength of the radio waves to be transmitted according to the strength of the received radio waves so that communication can be performed with the minimum necessary power, and the base unit and the slave unit are Each of the child units is provided with a control means for controlling the communication to be performed using a predetermined maximum power when communicating on the control channel.

Further, the cordless telephone of the present invention includes a base unit connected to a telephone line, and a plurality of slave units connected to the base unit via wireless lines, and the base unit and each slave unit are connected to each other by wireless lines. is equipped with a function to control the strength of radio waves to be transmitted according to the strength of received radio waves so that communication can be performed with the minimum necessary power, and each of the base unit and each slave unit has , when communicating between the base unit and multiple slave units,
A control means is provided for controlling communication to be performed using a predetermined maximum power.

[0026]

[Operation] During communication on the control channel, each control means of the master unit and slave unit controls the operation of the signal demodulation circuit and the signal modulation circuit so that communication is performed with a predetermined maximum power.

After the line is connected, the strength of the transmitted radio waves is controlled in accordance with the strength of the received radio waves so that communication can be performed using the minimum necessary power.

[0028] Furthermore, when communicating between the base unit and a plurality of slave units, each control means of the base unit and slave units controls the operation of the signal demodulation circuit and the signal modulation circuit so that communication is performed with a predetermined maximum power. I do.

After the line is connected, the strength of the transmitted radio waves is controlled in accordance with the strength of the received radio waves so that communication can be performed with the minimum necessary power.

[0030] As a result, stable operation can be performed without being affected by some degree of radio wave interference during the line connection control stage before transitioning to a call, and after the line is connected, communication can be performed with the aim of reducing power consumption. It can be carried out.

[0031]

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 electrical configuration of the base unit of the cordless telephone according to the present invention, and FIG. 2 is a block diagram showing the electrical configuration of the slave unit of the cordless telephone according to the present invention.

In FIG. 1, an interface circuit 2 for performing a telephone call interface is connected to a telephone line 1, and the output of the interface circuit 2 is sent to an amplifier circuit 4.
is connected to a signal modulation circuit 6 to which an antenna 9 is connected.

A signal demodulation circuit 5 is also connected to the antenna 9, and the output of the signal demodulation circuit 5 is connected to the input of the interface circuit 2 via the amplifier circuit 3.

Furthermore, the control circuit 7 that controls the operation of the entire base unit, the signal demodulation circuit 5, and the signal modulation circuit 6 are each bidirectionally connected.

Furthermore, the control circuit 7 and the determination circuit 8 which monitors the operating state of the base unit and determines whether or not to perform transmission power control are bidirectionally connected.

The determination circuit 8 receives operation control signals from the control circuit 7 (for example, an incoming call detection signal from the telephone line 1, an incoming call response signal from the handset, an outside line connection request signal from the handset, a channel switching control signal, etc.). It is configured to determine whether or not to perform transmission power control based on the various signals of . .

The control circuit 7 also includes a microcomputer section (ROM
, RAM, I/O, etc. ), a control section for each block, a transmission data section, a reception data section, a key input detection section, a transmission power control section, etc.

In FIG. 2, the input of a signal demodulation circuit 12 and the output of a signal modulation circuit 13 are connected to an antenna 11 that transmits and receives signals to and from the base unit, and the output of the signal demodulation circuit 12 is , the earpiece 16 via the amplifier circuit 14
It is connected to the.

Furthermore, the output of the microphone 17 is transmitted to the amplifier circuit 15.
It is connected to the input of the signal modulation circuit 13 via.

[0041] Furthermore, the control circuit 18 that controls the operation of the entire slave device, the signal demodulation circuit 12, and the signal modulation circuit 13 are each bidirectionally connected.

Further, the control circuit 18 is connected to the output of a determination circuit 19 that monitors the operating state of the slave unit and determines whether or not to perform transmission power control.

The determination circuit 19 receives operation control signals from the control circuit 18 (for example, an incoming call detection signal from a base unit, an incoming call response signal, an outside line connection request signal from a key input section (not shown),
Various signals such as channel switching control signals. ), and when it is determined that transmission power control needs to be prohibited, a control prohibition signal is output to the control circuit 18.

The control circuit 18 also includes a microcomputer section (RO
Includes M, RAM, I/O, etc. ), a control section for each block, a transmission data section, a reception data section, a key input detection section, a transmission power control section, etc.

Next, the operation of the cordless telephone with the above configuration is as follows: (1) When connecting a telephone line by making a call from a handset, (2) When an incoming call from a telephone line is detected and multiple handsets are connected. This will be explained separately when calling a machine.

(1) When connecting a telephone line by making a call from a handset.

As an initial state, the signal demodulation circuit 12 of the slave device
is constantly operated under the control of the control circuit 18, and monitors the radio waves of the control channel from the base unit.

In this state, when an outside line connection operation is performed by operating the key input section (not shown) of the handset, the control circuit 18
activates the signal modulation circuit 13 by this outside line connection operation. The signal modulation circuit 13 transmits radio waves of the control channel to the base unit via the antenna 11.

The operation signal of the key input section at this time is also given to the determination circuit 19. The determination circuit 19 determines whether or not to perform transmission power control based on this operation signal. In this case, it is determined that transmission power control needs to be prohibited, and therefore, a control prohibition signal is output from the determination circuit 19 to the control circuit 18.

The control circuit 18 performs control based on this control prohibition signal so that the power of the transmitted radio wave from the signal modulation circuit 13 is always at the maximum power.

That is, at this time, the control channel radio waves transmitted from the signal modulation circuit 13 are always transmitted at maximum power, and no transmission power control is performed.

In the base unit, the signal demodulation circuit 5 is constantly operated under the control of the control circuit 7, and monitors the radio waves of the control channel from the slave unit. Therefore, the radio waves of the control channel from the handset are received by the signal demodulation circuit 5 via the antenna 9 and given to the control circuit 7.

When the control circuit 7 receives the control channel radio waves from the slave device, it activates the signal modulation circuit 6 and transmits the control channel radio waves to the slave device side via the antenna 9.

[0054] At this time, a signal indicating reception of the control channel from the slave device is also given to the determination circuit 8. Judgment circuit 8
Now, it is determined whether or not to perform transmission power control based on this signal. In this case, it is determined that transmission power control needs to be prohibited, and therefore, a control prohibition signal is output from the determination circuit 8 to the control circuit 7.

Based on this control prohibition signal, the control circuit 7 performs control so that the power of the transmitted radio wave from the signal modulation circuit 6 is always at the maximum power.

That is, at this time, the control channel radio waves transmitted from the signal modulation circuit 6 are always transmitted at maximum power, and no transmission power control is performed.

When the slave unit confirms the connection of the control channel line by receiving the control channel from the base unit, the control circuit 18 then sends an outside line connection request signal to the signal modulation circuit 13.
The carrier signal is modulated here and transmitted to the antenna 11.
to the base unit. The transmitted radio waves at this time are also controlled to have the maximum power.

In the base unit, the external line connection request signal from the slave unit is received by the signal demodulation circuit 5 via the antenna 9, and
It is given to the control circuit 7.

The control circuit 7 connects the base unit and the telephone line 1 based on this external line connection request signal.

After this, the base unit and slave unit switch to the same communication channel. Then, when the other party responds and transitions to a talking state, each determination circuit 8, 19 of the base unit and slave unit determines that it is necessary to perform transmission power control, and each control circuit 7,
The output of the control prohibition signal to 18 is stopped.

Based on this determination result, each control circuit 7, 18 will thereafter perform transmission power control in the conventional manner. That is, each control circuit 7, 18 is connected to each signal modulation circuit 6,
13 to control the strength of the transmitted radio waves according to the strength of the received radio waves so that communication can be performed with the minimum necessary power.

[0062] Thereby, the voice of the other party sent through the telephone line 1 is given to the amplifier circuit 4 via the interface circuit 2, where it is amplified to the level necessary for a telephone conversation, and then sent to the signal modulation circuit 6. Given. The signal modulation circuit 6 modulates the carrier signal with this audio signal and transmits it from the antenna 9 to the handset side.

At this time, the transmitted radio wave from the signal modulation circuit 6 is converted into a signal indicating the strength of the radio wave from the handset (this signal is given from the signal demodulation circuit 5 to the control circuit 7). The control circuit 7 controls the power so that the power is adjusted accordingly.

In the handset, this transmitted radio wave is received by the antenna 11, demodulated into the original audio signal by the signal demodulation circuit 12, and then amplified by the amplifier circuit 14 to the level necessary for driving the earpiece 16. Emit as audio.

The audio signal input from the microphone 17 of the handset is amplified by the amplifier circuit 15 to a level necessary for transmission, and then provided to the signal modulation circuit 13. The signal modulation circuit 13 modulates the carrier signal with this audio signal and transmits it from the antenna 11 to the base unit side.

At this time, the transmitted radio wave from the signal modulation circuit 13 is converted into a signal indicating the strength of the radio wave from the base unit (this signal is given to the control circuit 18 from the signal demodulation circuit 12). The control circuit 18 controls the power so that the power is adjusted accordingly.

In the base unit, this transmitted radio wave is received by the antenna 9, demodulated into the original audio signal by the signal demodulation circuit 5, and then amplified by the amplifier circuit 3 to the level necessary for transmission. Send to 1.

(2) When detecting an incoming call from a telephone line and calling multiple handsets.

[0069] In the initial state, the signal demodulation circuit 5 of the base unit is always operated under the control of the control circuit 7, and monitors the radio waves of the control channel from the slave unit. Further, the signal demodulation circuit 12 of the slave unit is always operated under the control of the control circuit 18, and monitors the radio waves of the control channel from the base unit.

In this state, when a calling signal is sent through the telephone line 1, this calling signal is detected by an incoming call detection circuit (not shown) of the base unit, and the incoming call detection signal is given to the control circuit 7.

The control circuit 7 activates the signal modulation circuit 6 based on this incoming call detection signal. The signal modulation circuit 6 transmits radio waves of the control channel to the handset side via the antenna 9.

The incoming call detection signal at this time is also given to the determination circuit 8. The determination circuit 8 determines whether or not to perform transmission power control based on this incoming call detection signal. In this case, it is determined that transmission power control needs to be prohibited, and therefore, a control prohibition signal is output from the determination circuit 8 to the control circuit 7.

The control circuit 7 performs control based on this control prohibition signal so that the power of the transmitted radio wave from the signal modulation circuit 6 is always at the maximum power.

That is, at this time, the control channel radio waves transmitted from the signal modulation circuit 6 are always transmitted at maximum power, and no transmission power control is performed.

In each child device, the signal demodulation circuit 12 is constantly operated under the control of the control circuit 18, and monitors the radio waves of the control channel from the parent device. Therefore, the radio waves of the control channel from the base unit are received by the signal demodulation circuit 12 via the antenna 11 of each slave unit, and are provided to the control circuit 18.

When the control circuit 18 receives the radio wave of the control channel from the base unit, it activates the signal modulation circuit 13 and transmits the radio wave of the control channel to the base unit via the antenna 11.

[0077] At this time, a signal indicating reception of the control channel from the base unit is also given to the determination circuit 19. The determination circuit 19 determines whether or not to perform transmission power control based on this signal. In this case, it is determined that transmission power control needs to be prohibited, and therefore, a control prohibition signal is output from the determination circuit 19 to the control circuit 18.

The control circuit 18 performs control based on this control prohibition signal so that the power of the transmitted radio wave from the signal modulation circuit 13 is always at the maximum power.

That is, at this time, the control channel radio waves transmitted from the signal modulation circuit 13 are always transmitted with maximum power, and transmission power control is not performed.

When the base unit confirms that the connection of the control channel line with all slave units is completed by receiving the control channel from each slave unit, both the base unit and each slave unit are connected to the same Switch to the call channel.

[0081] When switching to the communication channel, the base unit next sends an incoming call detection signal to the signal modulation circuit 6, which modulates the carrier signal and transmits it from the antenna 9 to each slave unit. The transmitted radio waves at this time are also controlled to have the maximum power.

[0082] Each slave unit receives the incoming call detection signal from the base unit,
The signal is received by the signal demodulation circuit 12 via the antenna 11 and provided to the control circuit 18 . Based on this incoming call detection signal, the control circuit 18 drives a speaker (not shown) to emit a ring tone.

That is, in this series of operations, since there are multiple handsets, it is not possible to specify the strength of the radio waves from each handset not only in the control channel but also in the communication channel. According to , in such a case, the transmission radio waves are always transmitted at maximum power, so that line connection control can be performed reliably.

[0084] From this state, when one handset responds to an incoming call and enters a talking state, the base unit and each handset perform transmission power control as before.

That is, each control circuit 7, 18 controls each signal modulation circuit 6, 13, and adjusts the strength of the radio waves to be transmitted according to the strength of the received radio waves so that communication can be performed with the minimum necessary power. will be controlled.

[0086]

[Effects of the Invention] The cordless telephone of the present invention performs communication using a specified maximum power when communicating on a control channel and when communicating between a base unit and a plurality of slave units before starting an outside call or an extension call. This configuration allows line connection control to be performed reliably even if, for example, there is some interference from radio waves from another cordless phone while the base unit and slave unit are communicating on a control channel. This has the effect of making it possible to

[0087] Furthermore, since transmission power is controlled during a call, it is possible to narrow the range in which the contents of the call can be intercepted. In the case of a handset, it is possible to extend talk time by minimizing battery consumption. When a power source such as a battery is built into the base unit as a measure against power outages, various effects can be obtained in the base unit, such as the same effects as those of the slave unit described above.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the electrical configuration of a base unit of a cordless telephone according to the present invention.

FIG. 2 is a block diagram showing the electrical configuration of a handset of the cordless telephone according to the present invention.

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

FIG. 4 is a block diagram showing the electrical configuration of a handset of a conventional cordless telephone.

[Explanation of symbols]

1　Telephone line 5, 12 Signal demodulation circuit 6,13 Signal modulation circuit 7,18 Control circuit 8, 19 Judgment circuit

Claims (2)

[Claims] Claim 1: Consisting of a base unit connected to a telephone line and a slave unit connected to the base unit via a wireless line, the base unit and the slave unit are capable of communicating with the minimum necessary power. In a cordless telephone equipped with a function to control the strength of radio waves to be transmitted according to the strength of received radio waves, each of the base unit and the handset has a predetermined channel when communicating on a control channel. A cordless telephone characterized by being provided with a control means for controlling communication to be performed using maximum power. 2. Consisting of a base unit connected to a telephone line, and a plurality of slave units connected to the base unit via wireless lines, the base unit and each slave unit are powered by a minimum amount of power. In a cordless telephone equipped with a function of controlling the strength of radio waves to be transmitted according to the strength of received radio waves so as to enable communication, each of the base unit and each of the slave units has a base unit and multiple 1. A cordless telephone set, characterized in that a cordless telephone set is provided with a control means for controlling communication to be performed using a predetermined maximum power when communicating with a cordless telephone set.