JPH01235442A - Codeless telephone - Google Patents

Abstract

PURPOSE:To use a slave machine only in the effective reach range of radio waves between a master machine and the slave machine by providing a dial function and ringer functions only for the master machine and providing a switch for operation when it is used for the slave machine. CONSTITUTION:The master machine 10 is provided with the dial device 18 and the ringer devices 26 and 28 and the slave machine 34 is provided with the switch 56 for operating the machine when it is used. The ringer devices 26 and 28 of the master machine 10 operate at the time of incoming call and termination. When the slave machine 34 is placed within a range that the calling bell can be heard, the slave machine 34 is connected to a public line by a radio waves when the switch 56 of the slave machine 34 is operated. When the slave machine 34 is in a place where the calling bell of the master machine 10 cannot be heard on the other hand, a user on the side of the slave machine 34 does not know that a telephone is ringing, and he will not pickup a handset 52. Since the slave machine 34 is allowed to be used only within the effective reach range of the radio waves in a prescribed distance from the master machine 10, the slave machine is inevitably and compulsorily regulated to be used in the state of an adverse S/N.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a cordless telephone, and particularly includes a base unit that can be directly connected to a public line, and a slave unit that is wirelessly connected to the public line through the base unit. Regarding cordless telephones.

[Prior art]

In a cordless telephone, a base unit and a handset each have a built-in wireless transmitting/receiving circuit, and therefore, the handset is connected to a normal public telephone line through the base unit using radio waves. Therefore, with a cordless telephone, the range of use is not limited by a connection cord unlike a normal telephone, and it is possible to make a call even at a location far from the base unit.

Conventionally, a base unit and a slave unit that constitute such a cordless telephone are both provided with a dial function and a ringer function.

[Problem to be solved by the invention] According to the Japanese law regarding this type of cordless telephone,
The electric field strength of the radio waves output from the base unit and slave unit is 3r.
It is regulated that the voltage must be 500μV/m or less at +JI locations. Therefore, if the child device is separated from the parent device by more than a certain distance, the SZN ratio will deteriorate.

However, even in this case, since the dial and ringer functions of the handset operate normally, the user is under the illusion that they can be used without any problem as long as they are within the range of normal operation, and the handset is not connected to the parent unit. The cordless handset is used even if it is beyond the effective range of radio waves and is more than a certain distance away from the device.

In this case, as mentioned above, the S/N ratio deteriorates, causing problems in use.

Therefore, the main purpose of this invention is to allow the use of the slave unit only within the effective range of radio waves between the base unit and the slave unit,
The object of the present invention is to provide a cordless telephone, thereby avoiding the above-mentioned usage problems.

[Means for Solving the Problems] The present invention provides a cordless telephone consisting of a base unit and a handset, in which only the base unit is provided with a dialing function and a ringer function, and the handset is provided with a dial function and a ringer function. This is a cordless telephone characterized by having a switch that can be operated.

[Effect]

When a call arrives or arrives, the ringer function of the base unit operates, for example, a ringing bell rings. Therefore, if the handset is placed within the range where the calling bell can be heard, when the handset's switch is operated, the handset is wirelessly connected to the public line through the base phone. However, if the handset is located in a place where it cannot hear the ringing bell of the base, the user at the handset will not know that there is a call.

Therefore, there is no need to pick up the handset of the handset.

When making a call or making a call, the handset does not have a dialing function, so the user must inevitably go to where the base phone is, and
After operating the switch on the handset, you enter the telephone number of the other party using the dialing function on the base unit.

〔Effect of the invention〕

According to this invention, since only the base unit has a dial function and a ringer function, the slave unit can only be used within a range where the S/N ratio is sufficiently large in communication with the base unit. Then, since the slave unit is allowed to be used only within the effective reach of radio waves at a certain distance from the base unit, its use under conditions with a poor S/N ratio is necessarily or forced to be restricted. Therefore, you can always have a clear conversation with good radio wave conditions. Moreover, since no special additional equipment is required to regulate the usable range, the cost does not increase.

The above objects, other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

〔Example〕

FIG. 1A is a block diagram showing an 'ijt machine constituting an embodiment of the present invention, and FIG. 1B is a block diagram showing a slave machine.

Referring to FIG. 1A, base unit 10 includes a microcomputer 12, and the entire operation is controlled by this microcomputer 12. Although details are not shown, the microcomputer 12 includes a CPU, and is connected to the CPU to store control programs to be described later and ID codes of the base unit 10 and slave unit 34 (FIG. 1B). ROM and RAM are included.

Microcomputer 12 controls telephone network 14 . Telephone circuit y414 is DTM F (Dual T
oneMult i - Frequency 1es
), the DTMF generator 16 is under the control of the microcomputer 12, and in response to keystrokes from the numeric keypad included in the keyboard 22, when making a call,
Generates a selection signal. The selection signal from the DTMF generator 16 is sent to the public line through a 2-wire/4-wire conversion circuit 20 and a pulse generation/DC circuit 22.

Further, when a dial pulse is sent from the microcomputer 12, the DTMF generation circuit 16 does not operate, and the pulse generation/DC circuit 22 is directly turned on/off by the microcomputer 12. A dial pulse signal for making a call is output to the public line.

The pulse generation/DC circuit 22 also closes or opens the DC circuit between the 2-wire/4-wire conversion circuit 20 and the public line under the control of the microcomputer 12.

Note that the 2-wire/4-wire conversion circuit 20 of the telephone network 14 includes:
The handset or receiver 24 of base unit 10 is connected. Although such a handset 24 is not necessary, if it is provided as in this embodiment, the base unit 10 can be used in the same way as a normal telephone, together with the 2-wire/4-wire conversion circuit 20, the microcomputer 12, and the keyboard 22. It can be used like this. The telephone network 14 further includes a ringer circuit 26.
This ringer circuit 26 detects a calling signal sent through the public line, and rings a buzzer or bell 28 in response to the calling signal.

The microcomputer 12 further includes a transmitting circuit 30.
and a receiving circuit 32 are connected, and these transmitting circuit 30 and receiving circuit 32 are connected to the first B.
The handset 34 shown in the figure is connected to a public line. That is, the transmission circuit 30 under the control of the microcomputer 12
A radio frequency carrier wave is modulated with a voice signal from a public line, an ID code from the microcomputer 12, etc. A carrier wave modulated by the audio signal, ID code, etc. passes through the antenna duplexer 36 and is radiated from the antenna 38 as a radio wave. The radio wave is received by the antenna 40 of the slave unit 34, passes through the antenna duplexer 42, and the carrier wave modulated with the audio signal, ID code, etc. from the base unit 10 is transmitted to the slave unit 34.
The signal is input to the receiving circuit 44 of. The receiving circuit 44 demodulates the audio signal, ID code, etc. from the received carrier wave, and
The audio signal is sent to the audio circuit 50 (FIG. 1B), i.e., the receiver 5.
4, and output the ID code etc. to the microcomputer 48.
Enter. On the other hand, the carrier wave modulated by the audio signal, ID code, etc. from the handset 34, which is radiated from the antenna 40 from the transmission circuit 46 of the handset 34 through the antenna duplexer 42, is transmitted to the antenna 38 of the base unit 10 and the antenna duplexer 42. vessel 36
The signal is then applied to the receiving circuit 32. Under the control of the microcomputer 12, the receiving circuit 32 demodulates the voice signal ID code etc. from the received carrier wave, and sends the voice signal to the telephone circuit! 1114, that is, a public line, and input the ID code and the like to the microcomputer 12.

Both the receiving circuit 44 and the transmitting circuit 46 of the handset 34 are controlled by a microcomputer 48. Although the details are not shown, the microcomputer 48 also includes a CPU, a ROM connected to the CPU and used to store control programs to be described later, ID codes of the base unit 10 and the slave unit 34, and a RAM. is included. This microcomputer 48 also controls the audio circuit 50. This audio circuit 50 causes the audio signal demodulated by the receiving circuit 44 to be output from the receiver 52 to the user. In addition,
Voice from the user is input to the transmitter 54, where it is converted into an electrical voice signal and provided to the transmission circuit 46.

Note that the handset 34 is provided with a call switch 56, which is operated by the user when making a call using the handset 34, that is, when using the handset 34. Therefore, the microcomputer 48 of the handset 34 is activated or activated by the switch signal from the call switch 56.

Furthermore, if the call switch 56 is configured as a power switch for the handset 34, power can be saved by turning off the power when the handset 34 is not in use.

Next, with reference to FIGS. 1A and 1B, the operation of this embodiment will be described based on the flowcharts shown in FIGS. 2A to 3B. Note that when making a call using the base unit 10, it is almost the same as a normal telephone, so the explanation thereof will be omitted.

First, we will explain the operation when there is an incoming call or an incoming call, that is, when a call is received through a public telephone line.

In this case, first, in the first step S11 in FIG. 2A, the ringer circuit 24 of the telephone circuit yi14 in FIG. 1A detects a calling signal sent through the public line. Accordingly, in the next step S13, a ringing tone is emitted from the buzzer or bell 28. At this time, if the handset 34 is within the audible range of the ringing tone of the base unit 10 and the user is near the handset, the user presses the call switch 56 of the handset 34 in the next step S15. Can be turned on. However, if the user is not near the handset 34, or if the user is located in a place where the handset 34 cannot hear the buzzer or bell sound from the base unit 10, the user can switch the call switch. 56 cannot be turned on, such incoming or incoming calls are sent to the handset 34.
is ignored on the side. Therefore, the slave unit 34 is connected to the base unit 10.
This effectively prevents the handset 34 from accepting or accepting incoming calls when the distance is greater than a certain effective range of radio waves.

When the call switch 56 is turned on, the next step S17
In the handset 340 microcomputer 48, the R
An off-hook signal is output to the transmitting circuit 46 following the ID code of the handset 34 read from the OM. therefore,
The carrier wave is modulated by the ID code and the off-footer signal in the transmitting circuit 46, and the carrier wave is modulated by the antenna duplexer 42.
Pass through and from antenna 40! ! The information is transmitted to the machine 10.

In the base device 10, in the next step S19, the previous step 3
The receiving circuit 32 receives the ID code and off-hook signal transmitted in step 17. ID included in received signal
The code and off-hook signal are connected to the microcomputer 1.
2 is input. Therefore, in step S21, the ID code and off-hook signal are decoded. Therefore,
I stored in the ROM of the microcomputer 12
If the D code and the decoded ID code match and are an off-footer signal, in the next step S23, the microcomputer 12 drives the pulse generation/DC circuit 22 to connect the public line and the 2/4 line. The DC circuit between the line conversion circuit 20 and the line conversion circuit 20 is closed. Thereafter, in step 325, the transmitting circuit 26 is activated, and in the next step S27, the transmitting circuit 30 transmits the carrier wave to the microcomputer 12.
The signal is modulated by the ID code of the base unit 10 stored in the ROM of the base unit 10 and transmitted from the antenna 38 to the slave unit 34.

On the handset 34 side, in the next step S29, the microcomputer 48 receives the ID code sent from the base unit 10 in the previous step 327, and matches the ID code of the base unit 10 stored in the ROM. If they match, the microcomputer 48 activates the audio circuit 50. In this way, the slave device 34 is connected to the public line through the base device 1o. However, I of m machine io
If the D code and the ID code of the handset 34 do not match,
No such line establishment takes place.

Thereafter, in steps S31 and S33, while performing simultaneous or bidirectional transmission and reception between the base unit 10 and the handset 34 as described above, the receiver 52 and the transmitter 54 of the handset 34 are
This makes it possible to make calls on the public line through the base unit 1o.

When the call ends, the user turns off the call switch 56 in the next step S35. Then, step S37
Then, the microcomputer 48 outputs the ID code and the on-hook signal to the transmission circuit 46, where the carrier wave is modulated by the ID code and the on-hook signal and transmitted to the base unit 10.

In addition, when the call switch 56 is a power switch, after the call switch 56 is turned off, the microcomputer 48 and the transmission circuit 46 are operated by another power source such as a backup power source.

On the base device 10 side, the receiving circuit 32
The microcomputer 12 receives the ID code and the on-footer signal, and then, in step S41, the microcomputer 12 decodes the ID code and the on-footer signal. At this time, if the ID codes match and it is an on-footer signal, in the next step S43, the pulse generation/DC circuit 22 is operated in the previous step S23, and the public line and 2-wire/4-wire conversion circuit are connected. 20 and end the call.

Next, the operation when making a call or making a call, that is, when making a call from the handset 34 will be explained.

Even when making a call using the handset 34, the keyboard 18 is only provided on the base unit 10, so the user can make a call using the handset 34.
4 and go near the base unit 10.

Therefore, calling from the handset 34 outside the effective range of radio waves is inevitably prevented.

In the first step 345 in FIG. 3A, first, the call switch 56 of the handset 34 is turned on. Then, the microcomputer 48 and the like of the handset 34 are activated, and the handset 34 becomes operational. And the next step S
47 to 359, step S1 shown in FIG.
Perform the same operations as steps 7 to S29 to establish a line with the public line.

When the line is established in step 359, in the next step S61, the user operates the keyboard 18 of the base unit 10 to input a desired telephone number. After being connected to the destination telephone, the next step S63 shown in FIG. 3B is performed.
Then, in S65, the handset 52 and the transmitter 54 of the handset 34 enable conversation through the base unit 10. When the call ends, the user turns off the call switch 56 in the next step 367, and thereafter steps 367 to S43 similar to steps 335 to S43 shown in FIG. 2B are performed.
75 is executed, and the conversation ends.

In the above-described embodiment, the off-hook state or on-hook state is transmitted along with the ID code from the slave device 34 to the base device 10, and the a-device 10 decodes them. However, if there is no other necessary information, only the ID code may be sent from the handset 34. That is, if an ID code is sent from the handset 34 immediately after receiving a call, then the device is in an off-hook state, and if an ID code is sent thereafter, the device is in an on-hook state.

Further, in the above-described embodiment, when the call is ended, the base unit 10 determines whether the call is over by transmitting the ID code or the like from the handset 34 to the base unit 10 after turning off the call switch 56. Therefore, in this case, it is necessary to keep the handset 34 operable for a while even after the call switch 56 is turned off. Therefore, call switch 5
6 is turned off, there is no carrier wave, so in base unit 10,
The end of the call may be determined by detecting the stop of the carrier wave. That way, you may not need a separate power supply.

Further, in the above-described embodiment, the keyboard 18 operated by the user's hand was used as an example of the dial function of the base unit 10. However, the "dial function" mentioned in this specification
There is a ``preset dial function'' that allows you to register a phone number in advance and automatically input the phone number by performing a predetermined operation, and an automatic dial function that automatically inputs a tone signal using a separate generator. Of course, it also includes functions.Similarly, "lingua function" includes
In addition to buzzers and bells as in the embodiment, audible things such as voices generated by voice synthesis techniques, visual things such as lamps and flashes, etc. can be included.

In addition to the call switch 56 provided in the handset 34 that is operated manually by the user as in the embodiment, the call switch 56 can detect when a voice is input to the transmitter 54 of the handset 34, for example. It may be a switch that is activated automatically.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1A is a block diagram showing a base unit according to an embodiment of the present invention, and FIG. 1B is a block diagram showing a slave unit that cooperates with the base unit. FIGS. 2A and 2B are flowcharts for explaining the operation of this embodiment when a call arrives. FIGS. 3A and 3B are flowcharts for explaining the operation of this embodiment when making a call. In the figure, 10 is a base unit, 12.48 is a microcomputer, 14 is a telephone network, 18 is a keyboard, 22 is a pulse generation/DC circuit, 26 is a ringer circuit, 26 is a buzzer or bell, and 30.46 is a transmitter circuit. , 32 and 44 are receiving circuits, 52 is a receiver, 54 is a transmitter, and 56 is a call switch. Patent Applicant Funai Electric Co., Ltd. Agent Patent Attorney Yama 1) Yoshihito Figure 2A Loose 1-52B Figure 3A 3-:i]j;3
B figure

Claims (1)

[Claims] In a cordless telephone consisting of a base unit that can be directly connected to a public line and a slave unit that is wirelessly connected to the public line through the base unit, only the base unit is provided with a dialing function and a ringer function, and the slave unit is provided with a dialing function and a ringer function. A cordless telephone characterized in that the machine is equipped with a switch that is operated when using the telephone.