JPH08340294A - Cellular/cordless telephone system - Google Patents

Abstract

PURPOSE: To provide a cellular/cordless telephone system capable of switching from a cordless telephone mode to a cellular telephone mode in a short time. CONSTITUTION: A slave unit 60 is provided with a radio part 66, a spread spectrum part 67 for performing spread spectrum modulation and spread spectrum demodulation to high frequency signals, a control part 64 for controlling the entire system and a voice processing part 65 for processing voice signals and a master unit 40 is provided with a line interface part 45 for mutual connection with a cable telephone line, the radio part 48, the spread spectrum part 49 for performing spread spectrum modulation and spread spectrum demodulation to the high frequency signals and the control part 47 for controlling the entire system.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cellular / cordless telephone device having a cellular telephone call function and a cordless telephone call function.

[0002]

2. Description of the Related Art In recent years, wireless cordless telephone devices have been used instead of cords between a telephone body and a handset. In addition to this, a cellular / cordless telephone device has become available which enables wireless communication with a public line or a mobile phone via a base station.

A conventional cellular / cordless telephone device will be described below with reference to the drawings.

FIG. 2 is a block diagram showing a conventional cellular / cordless telephone device and its surroundings. In FIG. 2, reference numeral 1 is a base unit. Of the base unit 1, 2 is a key input unit that enables external input, and includes a dial button and the like necessary for making a telephone call. 3 is a microphone, 4 is a speaker, 5 is a wired telephone line, 6 is a line interface unit for interconnection with the wired telephone line 5, 7 is a voice processing unit for processing an audio signal, and 8 is from the wired telephone line 5. A control unit for detecting incoming calls and receiving control signals sent from the handset 20 and controlling each part. 9 modulates the control signal / voice signal and sends it as a high frequency signal, or a high frequency wave sent from the handset 20. A radio unit 10 for reproducing a control signal / voice signal from a signal is an antenna.

Numeral 20 is a slave unit. Among the slave units 20, 21 is a speaker, 22 is a microphone, 23 is a key input unit, 24 is data from the key input unit 23 and control signals sent from the master unit 1 and the base station 30, and controls each unit. A control unit for performing an audio signal, a voice processing unit for processing an audio signal,
26 modulates the control signal / voice signal from the control unit 24,
A radio unit 27 for transmitting a high-frequency signal and reproducing a control signal / voice signal from the high-frequency signal transmitted from the base unit 1 and the base station 30 is an antenna. In addition, the conventional cellular / cordless telephone device has a base unit 1 and a handset 2
Consists of zero.

Reference numeral 30 is a base station. Among the base stations 30, 31 is an antenna and 32 is a high frequency signal obtained by modulating a control signal / voice signal to the slave unit 20,
A cellular transmission / reception means for reproducing a control signal / voice signal from a high frequency signal sent from the child device 20, 33 receives an incoming call from a wired telephone line and a control signal sent from the child device 20, and receives the control signal from the base station 30. A control unit that controls each part of
Reference numeral 34 is a base station switch.

Conventional cellular / structured as described above
The operation of the cordless telephone device will be described below.

First, the operation of the cellular / cordless telephone device at the time of making or receiving a call when used as a cordless telephone will be described.

When making a call, first, the power of the slave unit 20 is turned on and the call button is pressed (this operation is performed using the key input unit 23). Then, the control unit 24 controls the wireless unit 26 to send a control signal to the base unit 1, and the base unit 1 sends the control signal to the wireless unit 9.
To receive this signal. When the control unit 8 in the base unit 1 decodes this control signal and detects that there is a call request from the handset unit 20, it transmits a confirmation (ACK) signal using the wireless unit 9, and further, a wired telephone line. 5 and the wireless link to the child device 20 are connected.

After this, just like a normal wired telephone,
When the telephone number is input by the key input unit 23 in the slave device 20, the control unit 24 transmits a multi-frequency signal (DTMF) corresponding to the input telephone number. This signal is transmitted to handset 2
0 is transmitted via the wireless unit 26 and the antenna 27. On the side of the base unit 1, the signal is received by the antenna 10 and the wireless unit 9, and is transmitted via the voice processing unit 7 and the line interface unit 6 to the wired telephone line 5. Send to.

By the above operation, a call is made to the cellular / cordless telephone device, and the user uses the speaker 21 to
The voice processed by the voice processing unit 25 of the child device 20 is heard. Further, the voice signal input by the user using the microphone 21 is processed into a high frequency by the voice processing unit 25 and transmitted to the base unit 1 side, so that the user can make a normal call.

Next, the operation when receiving an incoming call will be described. First, the control unit 8 of the parent device 1 detects an incoming call from the wired telephone line 5. Then, the control unit 8 transmits a control signal to the slave device 20 via the wireless unit 9 to notify the incoming call. In the child device 20, the control signal from the parent device 1 is received via the antenna 27 and the wireless unit 26, and the control signal is input to the control unit 24. The control unit 24 detects from the control signal that the master unit 1 has an incoming call and is calling the slave unit 20, and sounds a ringing sound of the slave unit 20 to notify the user that there is an incoming call.

After that, the user operates the key input unit 2 of the child device 20.
When the call button in 3 is pressed, a confirmation (ACK) signal is transmitted to the master unit 1 using the wireless unit 26. Base unit 1 confirms (A
When the CK) signal is received, the wired telephone line 5 and the wireless link to the child device 20 are connected, and the call is ready.

Next, the operation at the time of making a call and receiving a call when the cellular / cordless telephone device is used as a cellular telephone will be described.

When making a call, the power of the handset 20 is turned on, the telephone number is input by the key input unit 23, and the call button is pressed. Then, the control unit 24 controls the wireless unit 26 to send a control signal to the base station 30, and the base station 30 causes the antenna 3 to operate.
This signal is received by the cellular transmitting / receiving means 32 via 1.

When the control unit 33 in the base station 30 decodes this control signal and detects that there is a call request from the slave unit 20, it transmits a confirmation (ACK) signal using the cellular transmission / reception means 32, and further, A wireless link to the base station 30 and the mobile device 20 is connected. After that, the call can be made by the same operation as the call operation when the cordless telephone mode is used.

The base station 30 uses the DTMF emitted by the handset 20.
The signal is decoded by the base station switch 34, and a wireless link or a wired telephone line with another child device (not shown) is connected,
Enter a normal call state.

Next, the case of receiving an incoming call will be described.
An incoming call from another cordless handset or a wired telephone line 5 is transmitted to the base station 3
The control unit 33 of 0 detects. Then, the control unit 33 transmits a control signal via the cellular transmission / reception unit 32 to notify the slave device 20 of the incoming call. In the child device 20, the control signal from the base station 30 is received via the antenna 27 and the wireless unit 26, and this control signal is input to the control unit 24.

The control section 24 receives the control signal and outputs the slave unit 2
Detecting that 0 is being called, the ringing tone of the handset 20 is sounded to inform the user that there is an incoming call.

After that, the user operates the key input unit 2 of the child device 20.
When the call button in 3 is pressed, the control unit 24 transmits a confirmation (ACK) signal using the wireless unit 26. Upon receiving the confirmation (ACK) signal, the base station 30 connects the other handset or the wired telephone line with the wireless link to the handset 20 and enters the call state.

Next, the case of switching from the cordless telephone mode to the cellular telephone mode will be described. Cordless handset 20
However, when the caller goes out of the callable range of the cordless telephone during the call in the cordless telephone mode, the control unit 24 controls the wireless unit 26 to send a control signal to the base station 30, and the base station 30 transmits the control signal via the antenna 31. The cellular transmitting / receiving means 32 receives this signal.

When the control unit 33 in the base station 30 decodes this control signal and detects that there is a call request from the slave unit 20, it transmits a confirmation (ACK) signal using the cellular transmission / reception means 32. Upon receiving the confirmation signal, the slave unit 20 changes the carrier frequency from the frequency of the cordless telephone mode to the frequency of the cellular telephone mode, communicates with the base station 30, and connects the wireless link between the base station 30 and the slave unit 20.

After that, the call can be made in the same manner as the call operation when the cellular telephone mode is used.

[0024]

However, the conventional cellular / cordless telephone device has the following problems.

That is, since the cordless telephone and the cellular telephone use different frequencies, when the cordless telephone mode is switched to the cellular telephone mode, the frequency of the cordless telephone must be switched to the frequency of the cellular telephone. Frequency switching takes time,
There is a problem that it takes time to switch the call from the cordless telephone mode to the cellular telephone mode.

Therefore, an object of the present invention is to provide a cellular / cordless telephone device which can switch from a cordless telephone mode to a cellular telephone mode in a short time.

[0027]

A cellular / cordless telephone device of the present invention comprises a slave unit and a master unit, and the slave unit comprises:
A microphone, a speaker, a key input section for inputting operation signals from the outside, a high frequency signal from the base unit and a high frequency signal from the base station are received to reproduce the control signal / voice signal and modulate the control signal / voice signal. Then, a radio unit that transmits a high frequency signal to the master unit or the base station, a spread spectrum unit that performs spread spectrum modulation and spread spectrum demodulation on the high frequency signal, a control unit that controls the entire device, and a voice processing unit that processes the voice signal. The base unit has a line interface unit for interconnection with a wired telephone line, and receives a high frequency signal from the handset unit to reproduce a control signal / voice signal or modulate a control signal / voice signal. A radio unit that transmits a high-frequency signal to the slave unit and a spread-spectrum unit that performs spread spectrum modulation and spread spectrum demodulation on the high frequency signal. And a control unit that performs.

[0028]

In the above structure, by providing the spread spectrum unit, the same frequency can be used for the cordless telephone and the cellular telephone, and the call can be switched from the cordless telephone mode to the cellular telephone mode without switching the frequency. Becomes Therefore, the time for switching the frequency can be omitted, and the mode can be switched as fast as that.

[0029]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing a cellular / cordless telephone device and its surroundings in one embodiment of the present invention.

In FIG. 1, reference numeral 40 is a master unit. Base unit 4
In 0, 41 is a key input unit, 42 is a microphone, 43 is a speaker, 44 is a wire telephone line, 45 is a line interface unit, 46 is a voice processing unit, 50 is an antenna,
These are similar to the conventional example shown in FIG.

Reference numeral 47 is a control unit for detecting an incoming call from the wired telephone line 44 and receiving control signals sent from the handset 60 to control each unit, and 48 is a spectrum spread unit 49 for modulating control signals and voice signals. A radio unit that transmits a signal from the device as a high-frequency signal or receives a high-frequency signal sent from the child device 60, demodulates the signal from the spread spectrum unit 49, and reproduces a control signal and a voice signal, Reference numeral 49 is a spread spectrum unit that performs spread spectrum modulation on the transmission signal during transmission and performs spread spectrum demodulation on the reception signal during reception.

In the slave unit 60, 61 is a speaker and 62
Is a microphone, 63 is a key input unit, 65 is a voice processing unit for processing a voice signal, and 68 is an antenna. These are the same as in the conventional example. Reference numeral 64 denotes a control unit that receives data from the key input unit 63 and control signals sent from the master unit 40 and the base station 70 to control each unit, and 66 modulates a control signal / voice signal from the control unit 64 to obtain a spectrum. A signal from the spread unit 67 is transmitted as a high frequency signal, or a high frequency signal sent from the base unit 40 and the base station 70 is received, and the signal from the spread spectrum unit 67 is demodulated to generate a control signal / voice signal. A wireless unit 67 for reproducing is a spread spectrum unit that performs spread spectrum modulation on a transmission signal at the time of transmission and performs spread spectrum demodulation on a reception signal at the time of reception.

In the base station 70, 71 is an antenna and 7
Reference numeral 5 is a base station switch, which are similar to those of the conventional example. Reference numeral 72 modulates a control signal / voice signal to the handset 60, transmits the signal from the spread spectrum unit 73 as a high frequency signal, or receives the high frequency signal sent from the handset 60, and outputs from the spread spectrum unit 73. Cellular transmission / reception means for demodulating the control signal and voice signal by demodulating the control signal, 73 is a spread spectrum unit that performs spread spectrum modulation on the signal at the time of transmission, and spread spectrum demodulation on the received signal at the time of reception, and 74 is a wired It is a control unit that receives an incoming call from the telephone line 44 and a control signal sent from the child device 20, and controls each unit of the base station.

The operation of the cellular / cordless telephone device configured as described above will be described below.

First, the operation of the cellular / cordless telephone device at the time of making a call and receiving a call when used as a cordless telephone will be described.

When making a call, first, the power of the handset 60 is turned on and the call button is pushed. Then, the control unit 64 controls the spread spectrum unit 67 and the wireless unit 66 to send a control signal to the master unit 40, and the master unit 40 receives the signals by the wireless unit 48 and the spread spectrum unit 49.

The spread spectrum section 67 and the spread spectrum section 49 perform spread spectrum modulation during transmission,
Performs spread spectrum demodulation during reception. When the control unit 47 in the parent device 40 decodes this control signal and detects that there is a call request from the child device 60, it transmits a confirmation (ACK) signal using the wireless unit 48 and the spread spectrum unit 49, Further, a wired telephone line 44 and a wireless link to the child device 60 are connected.

After this, like a normal wired telephone,
When a telephone number is input by the key input unit 63 in the slave unit 60, the control unit 64 transmits a multi-frequency signal (DTMF) corresponding to the input telephone number. This signal is transmitted to the handset 6
0 spread spectrum section 67, radio section 66, antenna 6
The signal is sent via the wireless communication unit 8 and is received by the antenna 50, the wireless unit 48, and the spread spectrum unit 49 on the base unit 40 side, and is sent to the wired telephone line 44 via the voice processing unit 46 and the line interface unit 45. .

As described above, a call is made to the cellular / cordless telephone device, and the user uses the speaker 61 to hear the voice processed by the voice processor 65 of the handset 60 and inputs the voice using the microphone 62. By processing the voice signal thus processed into a high frequency by the voice processing unit 65 and transmitting it to the base unit 40 side, a normal call becomes possible.

Next, the case of receiving an incoming call will be described.
First, the control unit 47 of the parent device 40 detects an incoming call from the wired telephone line 44. Then, the control unit 47 transmits a control signal via the wireless unit 48 and the spread spectrum unit 49 in order to notify the mobile device 60 of the incoming call.

In the slave unit 60, the control signal from the master unit 40 receives the antenna 68, the radio section 66, the spread spectrum section 6
It is received by 7 and input to the control unit 64. Control unit 64
Detects that the master unit 40 has an incoming call and calls the slave unit 60 by a control signal, and sounds the ringing tone of the slave unit 60 to notify the user that there is an incoming call.

After that, the user inputs the key input section 6 of the child device 60.
When the call button in 3 is pressed, a confirmation (ACK) signal is transmitted to the master device 40 using the wireless unit 66 and the spread spectrum unit. When the master device 40 receives the confirmation (ACK) signal,
The wired telephone line 44 and the wireless link to the handset 60 are connected to enter the call state.

Next, the operation at the time of making a call and receiving a call when used as a cellular telephone in the cellular / cordless telephone device will be described.

When making a call, the user turns on the power of the child device 60, inputs the telephone number with the key input unit 63, and presses the call button. Then, the control unit 64 controls the radio unit 66 and the spread spectrum unit 67 to send a control signal to the base station 70, and the base station 70 transmits this signal by the cellular transmission / reception means 72 and the spread spectrum unit 73 via the antenna 71. To receive.

Spread spectrum section 73 in base station 70
Is the spread spectrum unit 6 in the child device 60 and the parent device 40.
Similar to 7 and 49, spread spectrum modulation is performed during transmission, and spread spectrum demodulation is performed during reception. Base station 70
When the control unit 74 therein decodes the control signal and detects that there is a call request from the handset device 60, the control unit 74 confirms using the cellular transmitting / receiving unit 72 and the spread spectrum unit 73 (AC
K) Send a signal and further connect a wireless link to the base station 70 and the handset 60.

After that, the call can be made in the same manner as the call operation when the cordless telephone mode is used. The base station 70 decodes the DTMF signal emitted by the handset 60 with the base station switch 75, and connects the wireless link with another handset (not shown) or the wired telephone line 44,
After that, the normal call state is entered.

Next, the case of receiving an incoming call will be described.
The control unit 74 of the base station detects an incoming call from another cordless handset or the wired telephone line 44. The control unit 74 then controls the child device 6
In order to notify 0 of the incoming call, a control signal is transmitted via the cellular transmission / reception means 72 and the spread spectrum unit 73.

In the handset 60, the control signal from the base station 70 is transmitted to the antenna 68, the radio section 66 and the spread spectrum section 67.
The control signal is input to the control unit 64. The control unit 64 detects that the slave unit 60 is being called by the control signal, emits a ringing sound of the slave unit 60, and notifies the user that there is an incoming call.

After that, the user inputs the key input section 6 of the child device 60.
When the call button in 3 is pressed, a confirmation (ACK) signal is transmitted using the wireless unit 66 and the spread spectrum unit 67.
When the base station 70 receives the confirmation (ACK) signal, the base station 70 connects the wireless link to the other handset or the wired telephone line 44 and the handset 60 and enters the call state.

Next, the case of switching from the cordless telephone mode to the cellular telephone mode will be described. Handset 60
If the user goes out of the range of the cordless telephone during the call in the cordless telephone mode, the control unit 64 controls the radio unit 66 and the spread spectrum unit 67 to send a control signal to the base station 70, and the base station 70 This signal is received by the cellular transmitting / receiving unit 72 and the spread spectrum unit 73 via the antenna 71.

When the control unit 74 in the base station 70 decodes the control signal and detects that there is a call request from the slave unit 60, the cellular transmission / reception unit 72 and the spread spectrum unit 73.
To send an acknowledgment (ACK) signal.

The slave unit 60 which has received the confirmation signal communicates with the base station 70 by changing the pseudo noise code in the spread spectrum unit 67 without changing the carrier frequency, and the base station 70 and the slave unit 6 are connected.
Connect 0 wireless links. After this, the call can be made in the same manner as the call operation when the cellular phone mode is used.

Here, a brief description of spread spectrum communication will be given. In spread spectrum communication, a narrowband information signal is spread to a wideband signal by using a pseudo-noise code at the time of transmission, and a wideband signal is used as the original narrowband information signal at the time of reception by using a pseudonoise code. Demodulate to.

Therefore, in spread spectrum communication, a plurality of signals can be transmitted at the same carrier frequency by changing the pseudo noise code used. The connection method of the wireless system by this is called code division multiple access. This code division multiple access allows the same carrier frequency to be used in the cordless telephone mode and the cellular telephone mode by changing the pseudo noise code.

As a result, when switching from the cordless telephone mode to the cellular telephone mode, it is only necessary to change the pseudo noise code and it is not necessary to change the carrier frequency, so that the switching time can be shortened.

[0057]

As described above, according to the present invention, in the cellular / cordless telephone device, the spread spectrum section is provided, so that the same frequency is used in the cellular telephone mode and the cordless telephone mode, and the pseudo noise code of the spread spectrum is changed. / Switching between cordless and cellular / cordless can be performed at high speed.

[Brief description of drawings]

FIG. 1 is a block diagram showing a cellular / cordless telephone device and its surroundings in an embodiment of the present invention.

FIG. 2 is a block diagram showing a conventional cellular / cordless telephone device and its surroundings.

[Explanation of symbols]

 40 Cellular / Cordless Telephone Device Master Unit 41 Key Input Unit 42 Microphone 43 Speaker 44 Wired Telephone Line 45 Line Interface Unit 46 Voice Processing Unit 47 Control Unit 48 Radio Unit 49 Spread Spectrum Unit 50 Antenna 60 Cellular / Cordless Telephone Device Handset 61 Speaker 62 microphone 63 key input unit 64 control unit 65 voice processing unit 66 wireless unit 67 spectrum spreading unit 68 antenna 70 base station 71 antenna 72 cellular transmitting / receiving means 73 spectrum spreading unit 74 control unit 75 base station switch

Claims (1)

[Claims] 1. A slave unit and a master unit, wherein the slave unit includes a microphone, a speaker, a key input unit for inputting an operation signal from the outside, a high-frequency signal from the master unit, and a base station. A radio unit that receives a high-frequency signal and reproduces a control signal / voice signal or modulates the control signal / voice signal and transmits it as a high-frequency signal to the parent device or base station, and spread spectrum modulation and spread spectrum demodulation on the high-frequency signal. The master unit has a spread spectrum unit for performing the operation, a control unit for controlling the entire apparatus, and an audio processing unit for processing an audio signal, and the master unit has a line interface unit for interconnection with a wired telephone line, and the slave unit. A radio unit that receives a high-frequency signal from the device and reproduces a control signal / voice signal, or modulates the control signal / voice signal and sends it as a high-frequency signal to the slave unit; Tram spread modulation and cellular / cordless telephone apparatus characterized by comprising: a spread spectrum unit spread spectrum demodulation, and a control unit that controls the entire apparatus.