JPH04140951A - Cordless telephone set - Google Patents

Abstract

PURPOSE:To inform it to an opposite party that the talking is in holding state by sending a hold transfer signal to a master set from a slave set when a voltage drop detector detects it that a battery voltage is decreased to a minimum operating voltage or below. CONSTITUTION:A CPU 20 is a one-chip CPU in which a ROM or the like is built in same chip and applies control processing such that the CPU sends a hook-on signal and a hook-off signal to a data signal output section 24 based on a program data written in advance in the ROM and an incoming tone speaker 29 rings when an incoming signal is inputted from a data signal input section 23. Moreover, when a voltage drop detector 47 outputs a signal representing the drop of the battery voltage, the CPU 20 applies processing as a hold transfer means to send a hold transfer signal to a master set 1. Then hold transfer is applied from a slave set 2 to the master set 1 automatically and a handset 18 of the master set or a telephone set is used to restart talking.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a cordless telephone, and in particular, when the power supply voltage (battery voltage) on the handset side drops during a call, the system automatically transfers the hold to the base phone side. Regarding cordless telephones that perform

<Prior Art> In recent years, cordless telephones have become popular, in which a handset with a built-in microphone and speaker is provided with dials and function switches, and a base unit and handset connected to a single station line are connected wirelessly.

The handset has a built-in battery so that it can be carried freely and used anywhere. Therefore, the battery may be exhausted during a call, and the power supply voltage of the handset may drop below a specified value. For this reason, when the battery voltage drops, a lamp is turned on or an alarm sounds to notify the user of the drop in battery voltage.

By the way, there is a coatless phone that has a structure in which when the handset is placed on the base unit, the battery of the handset is charged from the charging circuit inside the base unit, but with this type of phone, During a long call, if the battery voltage drops to the minimum operating voltage amount F,
・It was not possible to charge the battery while making a call, and there was a fear that one episode would cut out in the middle of the call.

<Problems to be Solved by the Invention> In addition, a mounting table C5'I for the handset, a charger for charging the battery of the handset is provided, and an AC adapter is connected to the power supply terminal of the charger (1). There are two types of dress telephones that have a similar structure.

When this type of cordless phone is not in use, the battery of the handset is charged by placing it on the mounting stand (ff L), but when it is in use, the handset is removed from the mounting stand and used, so charging is not performed. It's not there.

Therefore, if the battery discharges and the voltage of the slave unit drops below the minimum operating voltage due to a long call, the slave unit will notify the user of the low battery voltage by lighting a lamp or sounding an alarm. At this time, the user connects the handset to the stand.]
If you remove the plug from the AC adapter 7 and connect it to the power input terminal of the handset, you can continue making calls.

10, [5, If you are making a call and there is no Chouji 7 machine mounting stand near the user, connect the AC adapter to the handset at 1°C. I was in a hurry, and there was a lot of work to be done.

<Means for solving the 8 problems> The present invention solves the problems listed in
You can receive calls while on a call! If a drop in battery voltage occurs,
We offer a cordless phone jAII that allows calls to be held and transferred from the handset to the base unit, and then continued using the handset of the base unit or a telephone externally attached to the base unit. The purpose is to

For this reason, the cordless telephone of the present invention connects the central office line "1 line" connected to the central office line, the call transmitter and the call receiver to 411.
22. A base unit that makes and answers calls to the central office line while transmitting and receiving calls wirelessly to the handset, a pushbutton, a dial switch, a speaker for calls, a microphone, and a call receiving unit. Equipped with a handset that has a transmitter and a handset that wirelessly sends and receives calls between the base unit and the antenna via the antenna, and a handset on the base unit side and a button dial switch! 2C Zurane or a cordless phone that allows another phone to be connected to the base unit is equipped with a voltage drop detector that detects a voltage drop in the battery built into the handset, and the voltage of the battery is below the minimum operating voltage. When the voltage drop detector detects that the voltage has dropped, a hold transfer means is installed to send a hold transfer signal from the slave unit to the base unit.

Function> If the battery voltage drops below the minimum operating voltage value during a call using the handset, the voltage drop detector detects this voltage drop and outputs a detection signal.

At this time, a voltage drop warning lamp lights up 2 or an alarm sound is generated to notify the user of the drop in battery voltage.

Then, for example, several seconds later, the hold transfer means in the handset is activated, puts the call on hold, and sends a hold transfer signal to the base phone. When the base unit receives the hold transfer signal, it generates a discharge sound. On the other hand, the user who had been using the handset to make the right call would notice that the battery voltage was low due to the lighting of the lamp or the sound of the alarm, and the call would automatically be put on hold after a few seconds. I don't know. After that, the user moves to the location where the base phone is located, picks up the handset of the base phone (or the handset of another phone connected to the base phone), and releases the hold.
Resume the call to which party.

<Example> Hereinafter, embodiments of the present invention will be described based on the drawings.

FIG. 1 shows a block diagram of a base unit 1 of a cordless telephone. A bell receiving circuit 14 receives a bell signal from the line, a data signal input section 17 receives a data signal, and a handset 18
, a circuit for controlling handset shorthand and reception, and a CPU 3 for controlling processes such as making and receiving telephone calls.

The call transmitter 11 includes a bandpass filter, an oscillator, and an FM
It consists of a modulator, etc., and the transmission output side is connected to the antenna 16, and outputs a specific frequency signal that is FM modulated according to the call sound and data signal that arrived via the central office line to the antenna 16, and transmits it to the handset 2. The call receiving unit 12 includes a bandpass filter, an RF amplifier, a mixer, a local oscillator, an intermediate frequency circuit, a demodulation circuit, a filter, etc., and receives transmission signals (call sounds and data signals) from the handset 2 via the antenna 16. is received and demodulated, the audio signal is output to the office line circuit 15, and the data signal is output to the CPU 13.

The CPU 13 is a one-chip CPU that incorporates a ROM, etc. on the same chip.Based on program data written in the ROM in advance, the CPU 13 performs processes such as making and receiving telephone calls, and holding telephone calls during hold transfers, etc., as described below. I do.

The office line circuit 15 consists of a rectifier circuit, a DC connection circuit that connects the office line in a DC manner, a communication circuit, etc., and receives a control signal from the CPU 13 to block or open the office line, and closes or opens the office line. It outputs the call signal from the call transmitter 11 or the handset 18, and sends the call signal from the call receiver 12 or the handset 18 to the central office line. Further, the bell receiving circuit 14 is connected to the office line terminal, receives a bell signal coming from the office line, and sends the signal to the CPU i 3.

The data signal input section 17 inputs various coded command signals sent from the handset 2, which will be described later, via the call reception section 12, and sends the signals to the CPU Iβ.

The handset 18 disposed on the base unit 1 is connected to the central office line circuit 1.
5, and when the handset 18, which will be described later, is not used, the handset 18 can be used to make calls in the same way as a regular telephone. A hook switch 9 is turned on and off by raising and lowering the handset 18, and outputs hook-on and hook-off signals to the CPU 13.

8 is a push button dial switch provided on base unit 1,
Numerical buttons “0” to “9” and “*” “#” “Short”
A button (key switch) such as a function button is provided, and when the button is pressed, a signal corresponding to the button is sent to the CPU 13. Reference numeral 19 is a speaker for producing a hold tone or the like.

Figure 2 shows a block diagram of the handset 2, and the circuit of the handset 2 is as follows:
As shown in the figure, the 0 call transmitting section 21 is composed of a telephone transmitting section 21, a telephone receiving section 22, a data signal input section 23, a data signal output section 24, and a CPU 20 that performs control processing of each circuit. , bandpass filter, oscillator,
It consists of an FM modulator, etc., and the transmission output side is connected to the antenna 26, and the antenna 26 receives a specific frequency signal that is FM-modulated according to the call sound input through the microphone 27 and the amplifier 41, and the data signal from the data signal output section 24. and send it to the base unit 1 side.

The call receiving unit 22 includes a bandpass filter, an RF amplifier,
It consists of a mixer, a local oscillator, an intermediate frequency circuit, a demodulation circuit, a filter, etc., and receives and demodulates the transmission signal (call sound and data signal) from the base unit l via the antenna 26, and the call sound is sent to the speaker 28 through the amplifier 42. The data signal is connected to be sent to the CPU 20 through the data signal input section 23. A rechargeable battery 43 is provided as a power source within the handset 2.

40 is a hook switch provided in the handset, which outputs hook-on and hook-off signals to the CPU 20. Reference numeral 45 denotes a central line lamp 46 that lights up when the central line is blocked, and is a warning lamp that lights up when the voltage of the battery 43 drops, and is turned on by a signal from the CPU 20. Reference numeral 47 denotes a voltage drop detector for the battery 43, which outputs a detection signal to the CPU 20 when the voltage of the battery 43 drops below a preset minimum operating voltage.

The CPU 20 is a one-chip CPU that incorporates a ROM, etc. on the same chip.Based on program data written in the ROM in advance, the CPU 20 sends hook-on and hook-off signals to the data signal output section 24, and receives an incoming signal from the data signal input section 23. When input, the CPU 20 performs control processing such as making the ringtone speaker 29 ring, and when a signal indicating a decrease in battery voltage is output from the voltage drop detector 47,
It performs processing as a hold transfer means that sends a hold transfer signal to the base unit 1.

44 is a push-button dial switch installed on the handset 2, which has numeric buttons from "0" to "9" and function buttons such as "U*Jr#Jr shortening"/etc. , when a button is pressed, a signal corresponding to that button is sent to the CPU 20.Thus, when a number button is pressed, an arc (g) is sent by command from the CPU 20.
A so-called PB double signal, which is a composite of two different audible frequency signals from the signal output section 24h), is sent to the call transmission section 21 in accordance with the operated push button.

Next, I will explain the basic operation of a cordless phone.
First, when making a telephone call to an external party, the user picks up the handset 2 from the stand or the like and sets the hook switch 40 off-hook. As a result, a hook-off signal is sent from the data signal output section 24 to the call transmitter 21, and the hook-off signal is sent from the data signal output section 24 to the call transmitter 21.
The hook-off signal is sent to the main unit 1 via the antenna 26.

In the base unit 1, this hook-off signal is not received by the call receiving unit 12 via the antenna 16, and the CPU 13 sends a control signal to the office line circuit 15 to block the office line.

In this state, the user inputs the telephone number of the telephone light using the push button dial switch 44. Then,
P from the data signal output section 24 corresponding to that dial.
The B call signal is sent to the call transmission section 21. The call transmitter 21 of the handset 2 transmits the PB signal to the base unit i+,b via the antenna 26, and the PB signal is received by the call receiver 12 of the base unit 1, and the central line circuit 15 is transmitted. The signal is then sent to the PB signal station line. When the person on the other end of the "C phone light" answers the call, the call will begin.

The user's voice is input from the microphone 2-7 of the handset 2, and is transmitted to the base unit 1 through the call transmitter 21 and the antenna 26.
The voice signal is received by the call receiving section 12 of the base unit 1, and then the voice signal is sent from the station line circuit 15 to the station line.

On the other hand, the voice from the other party's phone is transmitted to the office line circuit 15 of base unit 1.
is sent to the call transmitter 11 and transmitted to the handset 2 via the antenna 16. In the handset 2, this audio signal is received by the antenna 26 and the call receiving section 22, and the audio signal is sent to the spill power 28 via the amplifier 42, so that the user can hear the other party's voice from the speaker 28. .

On the other hand, when a call is received from outside and a bell signal arrives at the office line terminal, the bell receiving circuit 14 of the base unit 1 receives it.
, (II: A signal is output to the P U 13. At this time, the CPU 13 sends a signal to the office line circuit 15 to block the 8th line, and also sends an incoming call signal to the call transmitter Xi. The communication signal is sent to the call transmitter 11 and the antenna 1.
6 to 2nd F unit 2 (N sane, antenna 26 of slave unit 2,
The call reception unit 22 receives the call. Then, this incoming signal is sent from the data signal human power unit 23 to the CPU 2 Or:, and the CPU 20 causes the ring tone speaker 29 to sound.

Now the user knows that there is an incoming call from outside,
The handset 2 is picked up from the mount 1 and the hook switch 40 is turned off.

At this time, a hook-off signal is sent to CPU2O, and CPU2
0 sends this hook-off signal to the call transmitter 21 via the data output unit 24;
It is sent to base unit 1 via anti-t26. When this hook-off signal is received in the call receiving section 12 of the base unit 1, the CPU 13 operates the office line circuit to block the office line, allowing the user to talk to a caller from an external telephone. It becomes a state. On the other hand, when the voltage of the battery 43 drops below the preset minimum operating voltage during a call using the handset 2, the voltage drop detector 47 sends a detection signal to the CPU.
Output to 20.

As shown in Figure 3, CPtJ20 detects ('2
When No. 8 is input, voltage drop detection processing begins (step 100), and in the next step 110, the voltage drop warning lamp 46 is turned on or an alarm sound is generated to notify the user of the battery voltage. Notify of decline. And CP [J 20
After a certain period of time (for example, several seconds), in step 120, the hold transfer signal is sent from the signal output unit 24 to the call transmission unit 21.
and sends a hold transfer signal to base unit 1. on the other hand,
The user informs the other party that the call will be put on hold due to a drop in battery voltage.

When the CPU 13 of the base unit 1 inputs the hold transfer signal from the handset 2 via the call receiving unit 12 and the data signal input unit 17, the CPU 13 enters central line hold processing as shown in FIG. 4 (step 200). , In the next step 210, the call is stopped and the central office line is placed on hold.

Subsequently, in step 220, the held tone data stored in a memory or the like in advance is read out, a held tone signal is generated and sent from the office line circuit 15 to the office line, and then, in step 230, the speaker 19 is made to sound. Generates a ringtone.

On the other hand, the user who was using handset 2 leaves handset 2 and moves to base unit 1, lifts handset 18 on base unit 1, cancels the hold, and resumes the call. .

In this way, if the battery voltage of handset 2 drops below the minimum operating voltage during a call, handset 2 will automatically transfer the call to base unit 1 and use the handset on the base unit to resume the call. Since the call can be resumed, the call can be continued without being cut off even if there is no battery charger for the handset nearby.

In addition, as another embodiment, the base unit has a push button dial 8.
Instead of providing the handset 18, a structure may also be used in which another telephone is connected in parallel to the base unit. In this case, the base unit is provided with a modular plug connection socket for connecting the telephone, and is also equipped with a receiver-pickup detection circuit, so that when the telephone receiver is picked up and the telephone receiver is taken off-hook, calls placed on hold and transferred from the handset are , through the handset of the telephone.

<Effects of the Invention> As explained above, according to the cordless telephone of the present invention, a cordless telephone is provided with a handset and a push-button dial switch on the base unit side, or in which another telephone can be connected to the base unit. , the slave unit is equipped with a voltage drop detector that detects a voltage drop in the built-in battery, and when the voltage drop detector detects that the battery voltage has dropped below the minimum operating voltage, the slave unit issues a pending transfer. Since the configuration is configured to send a signal to the base unit, if the battery voltage of the handset drops below the minimum operating voltage during a call, the handset automatically transfers the call from the handset to the base unit, and the handset or Since the call can be resumed using the telephone, the user can continue talking without ending the call even if there is no battery charger or AC adapter for the handset nearby.

[Brief explanation of drawings]

The figures show one embodiment of the present invention, Fig. 1 is a block diagram of the base unit of the telephone, Fig. 2 is a block diagram of its slave unit, Fig. 3 is a flowchart of voltage drop detection processing, and Fig. 4 is a hold processing. This is a flowchart. ]...Base unit, 2...Slave unit, 11.21...Call transmission section, 12.22...Call reception section, 13...CPU, 15...Station line circuit, 18. ...Handset, 43...Battery, 7...Voltage drop detector. Patent applicant: Takacom Co., Ltd.

Claims (1)

[Claims] The base unit has a central office line circuit connected to the central office line, a call transmitter, and a call receiver, and transmits and receives calls to and from the handset wirelessly, while also making and answering calls to the central office line, and a pushbutton. A handset has a button dial switch, a speaker and a microphone for calling, a call receiving section, and a call transmitting section, and wirelessly transmits and receives calls to and from the base device via an antenna. A voltage drop detector for detecting a voltage drop in a battery built into a cordless telephone that is equipped with a handset and a push-button dial switch on the base unit, or that allows another telephone to be connected to the base unit. is provided, and when the voltage drop detector detects that the voltage of the battery has decreased below the minimum operating voltage, a hold transfer means is provided that sends a hold transfer signal from the slave unit to the base unit. A cordless telephone featuring