JP3270885B2 - Digital cordless telephone equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital cordless telephone device in which communication between a master unit and a slave unit is performed by transmitting and receiving digital data.

[0002]

2. Description of the Related Art A digital cordless telephone device is constructed, for example, as shown in FIG. In FIG. 7, reference numeral 1 denotes a base unit serving as a base station. The base unit 1 is connected to a telephone line and has an antenna 1a for communicating with a slave unit. A plurality (three in this case) of slave units capable of communicating with the master unit 1 are prepared. That is, the slave units 4, 5, and 6 are prepared, and the antennas 4a, 5a, and 6a are attached to the respective slave units 4, 5, and 6, and the antenna 1a of the master unit 1 and the antenna of each of the slave units 4, 5, and 6 are provided. 4a, 5a, 6
Wireless transmission is performed between the wireless communication device and the wireless communication device a.

When each of the slave units 4, 5, and 6 talks with the master unit 1 (or the other party connected to the master unit 1 via a telephone line), a connection control signal of a predetermined format is sent to the master unit 1.
Side, and transmits voice data converted into digital data in a time-sharing manner with the base unit 1 to make a call.

In such a digital cordless telephone device, the same frequency is used for transmission and reception, and a TDD system (time division duplex system) or a TDMA / TDD system (time division multiple access / time division system) for performing ping-pong transmission. Some methods employ a dual method.

That is, in the case of the TDD system, for example, FIG.
As shown in (1), one channel (frequency) is temporally divided into a transmission slot T and a reception slot R, and the slots T and R are alternately repeated. A time (not shown) is provided. In this case, for example, each of the slots T and R is set to 1 ms, and the guard time is set to several tens of microseconds. And
The mobile phone (slave) performs communication to the base station (master) in the transmission slot T, and receives from the base station in the reception slot R.

In the case of the TDMA / TDD system,
As shown in FIG. 8B, in the communication between one slave unit and the master unit, the transmission slot T and the reception slot R in one channel are used.
Is used only once in several cycles, and the other transmission slot T and reception slot R in the same channel are used for communication between the other handset and the base unit, so that a plurality of Are multiplexed so that communication between the communication devices can be performed.

[0007] With such multiplexing, the frequency band prepared for the cordless telephone is used efficiently. By the way, when such communication is performed, the transmission of the control signal from the master unit to each slave unit is performed in a predetermined format at predetermined intervals. That is, for example, as shown in FIG. 9A, the control signal d1 is transmitted to each slave unit for 625 μsec every 125 msec. Then, for example, when one of the slaves is called by an extension call or the like from the master, an individual number of the corresponding slave is transmitted by the control signal d1, and the corresponding slave is called. At the time of a standby operation in which each slave unit is waiting for a call from the master unit by a control signal, as shown in FIG. 9B, only this control signal is sent for a predetermined period (for example, 1 every 1.5 seconds). Times)
If the power supply of the receiving unit is intermittently turned on so as to perform intermittent reception, the power consumption required for reception in the reception standby state can be reduced accordingly. It should be noted that the control signal may be received once for basically 625 μsec. However, actually, the control signal is received only for about 10 msec in consideration of the rise time of the receiving unit. Therefore, for example, if the signal is received for 1.5 ms every 10 ms, the time during which the receiving unit is operating is about 0.67%, which is smaller than the case where the signal is received continuously.
Power consumption can be greatly reduced.

[0008]

By the way, as a system configuration of such a digital cordless telephone,
As shown in FIG. 1, a system having a plurality of master units has been considered. That is, in FIG. 1, reference numerals 1, 2, and 3 denote base units of a cordless telephone, respectively. The base units 1, 2, and 3 are individually connected to a telephone line and communicate with a slave unit. Antennas 1a and 2 for performing communication
a, 3a. Then, it is assumed that slave units 4, 5, 6, 7, 8} that can communicate with each of the master units 1, 2, 3 are prepared. At this time, each of the slave units 4, 5 # is capable of wireless communication with any of the master units 1, 2, 3 so that a call can be made via any of the master units. With this configuration, each child device can make an outgoing line via any of the parent devices, and can respond to an incoming call on any of the parent devices, and as a cordless telephone, The range of application expands.

[0009] However, if the slave unit is made to be able to communicate with a plurality of master units, it is necessary for each slave unit to receive control signals from all master units during a standby operation.
Intermittent reception during the standby operation described above is not possible,
It has been difficult to reduce the power consumption during the standby operation. That is, in each of the slave units 4 and 5,
There is a possibility that it will be called by a control signal even from 2 and 3,
A control signal transmitted from the first master unit 1 and a second master unit 2
And the control signal transmitted from the third master unit 3 must be received. Here, the control signals are periodically transmitted from the master units 1, 2, and 3, but the control signals transmitted from the three master units 1, 2, and 3 do not correspond at all. Has nothing to do. Therefore,
When each of the slave units 4 and 5 is in a standby operation state,
In order to be able to receive control signals from any of the base units, it is necessary to make the receiving unit of each of the slave units power on for a very long time.

In this case, the timing at which the control signals are transmitted from all the master units 1, 2, 3 may be detected, and the power of the receiving unit of each slave unit may be turned on only at the respective transmission timings. In this case, as shown in FIG. 9, the number of times of turning on and off is three times (in the case of three masters) as compared with the case where the master is turned on only when the control signal is transmitted from one master. In addition, on / off control of the receiving unit becomes complicated.

Also, as described above, a plurality of master units 1, 2, 3
When operating as a common system, it is assumed that the system is set as a cordless telephone system including three master units from the beginning (ie, three master units and their associated slave units are provided to the user as a set). In this case, if the same system call code is set to each master unit, the system operates as a common system. On the other hand, if there is a cordless telephone system composed of one base unit 1 and several slave units associated with it, adding another base unit 2 or 3 to this system later is This is difficult because different system call codes are set for each master unit.

Note that the system call code is a number unique to each master unit set at the stage of manufacturing each master unit. In order to prevent unauthorized use, the system call code set for each master unit is added later. Can not be changed from. Therefore, it is difficult to match the system call code of the base unit added later with the system call code of the existing base unit, and the base unit is added later to provide a cordless telephone system including a plurality of base units. Was difficult to construct.

In view of the foregoing, the present invention provides a cordless telephone apparatus of this kind which enables a control during standby operation of a slave unit in a system having a plurality of master units to be easily performed with low power consumption. Another object of the present invention is to make it easy to add a master unit.

[0014]

According to the present invention, in order to solve such a problem, a plurality of master units and a plurality of slave units are provided.
Transmission and reception of digital data between the master unit and slave unit
Can make calls with different time
In a cordless telephone device, different system calls
Sign is set to multiple master units, and multiple slave units are different
Receives and identifies system call codes, and identifies multiple base units
Digital that allows you to talk between these master units
A cordless telephone device, wherein a control signal transmitted from a predetermined master unit among a plurality of master units is used as a reference control signal,
It is received at a different base unit from the parent machine, in synchronization with the reception timing of the control signals, in which so as to transmit a control signal from a different base unit is a predetermined master unit.

[0015]

According to the present invention, each base unit transmits a control signal in synchronization with a control signal transmitted from a base unit serving as a reference, and a plurality of base units set with different system call codes are provided. The transmission timing of the control signal is always a constant synchronized timing.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS.

In this embodiment, the TDMA
This is applied to a digital cordless telephone device of the / TDD system. First, the system configuration is shown in FIG. In this example, three master units are prepared, and the first, second, and third master units 1, 2, and 3 are individually connected to a telephone line and connected to a slave unit. Antennas 1a and 2 for performing communication with each other
a, 3a. A plurality of slave units 4, 5, 6, 7, 8 # that can communicate with each of the master units 1, 2, 3 are prepared, and each of the slave units 4, 5 # Antennas 4a, 5a # for performing communication with the child device.
At this time, each of the slave units 4, 5 # is capable of wireless communication with any of the master units 1, 2, 3 so that a call can be made via any of the master units.

In this case, a different system call code is set to each of the base units 1, 2, and 3, and each of the base units 1, 2, and 3.
A control signal transmitted from each of the control signals 2 and 3 is added with a system call code set for the control signal, and it is possible to determine from which master unit the signal is transmitted by the system call code.

The configuration of the system call code will be described. First, the downlink control signal transmitted from each master unit is configured as shown in FIG. That is, first, a preamble P which is synchronous data in which a fixed pattern follows for a predetermined period.
R, and in the following, a unique word UW of a specific pattern indicating a control signal, a channel type C1 for communication, control data CAC indicating control content, and an error detection parity CRC.

Then, the identification code shown in FIG. 6 is transmitted using predetermined bits in the control data CAC. As this identification code, the system call code is transmitted using the first 29 bits, and the additional ID is transmitted using the second 13 bits. One transmission of the control signal shown in FIG. 5 is performed in 625 μsec.

In the present embodiment, the first master unit 1 among the three master units prepared is set as the master unit, and the other master units 2 and 3 are set as slave master units. The slave base units 2 and 3 receive the control signal transmitted from the master base unit 1 and transmit the control signals from the slave base units 2 and 3 at a timing synchronized with the reception timing of the control signal. Is sent. Specific control of the transmission timing will be described later.

Next, FIG. 2 shows the configuration of the slave units 4, 5 # used in the cordless telephone of this embodiment. In FIG. 2, reference numeral 11 denotes an antenna. Data received from the master unit or another slave unit by the antenna 11 is received and processed by the radio unit 12 and supplied to the modem unit 13 to demodulate the received data. Then, the demodulated reception data is transmitted to A via the communication control unit 14.
The AD supplied to the DPCM codec 15 and received and obtained
The PCM digital data is converted into an analog audio signal, and the analog audio signal is output from the speaker 16.

The audio signal picked up by the microphone 17 is converted to an AD signal.
The data is supplied to the PCM codec unit 15 to be digital data of ADPCM, and this digital data is transmitted to the communication control unit 14.
The data is supplied to the modulation / demodulation unit 13 via the communication unit and modulated for transmission, and the modulated data is wirelessly transmitted from the antenna 11 connected to the radio unit 12.

The key input unit 18 is connected to the ADPCM codec unit 1 via a man-machine interface unit 19.
5 and the operation information of the key input unit 18 is supplied to the communication control unit 14 side. Further, a display unit 20 is connected to the man-machine interface unit 19 to display an operation state and the like.

The communication control unit 14 controls the receiving operation so as to receive, at a predetermined interval, only a control signal transmitted on a predetermined control channel from the master unit when in a standby state. . In this case, the system call code included in the control signal is determined to determine whether or not the control signal is for the system to which the slave unit belongs. In addition, the master calling unit 1
From the master unit 1 of this master.
The intermittent reception is performed periodically based on the reception timing of the control signal from. This receiving process will be described later.

In this case, the communication control unit 14
A non-volatile memory 14a such as M is provided to store a system call code of a master unit that forms a system with the slave unit. That is, the memory 14a in the communication control unit 14
Is capable of storing a plurality of system call codes in a predetermined initial setting operation. When the slave unit receives a control signal, the system call code included in the control signal is stored in the system stored in the memory 14a. It is matched with the calling code, and if they match, it is recognized as the master unit of the same system. When the system call code is stored in the memory 14a, the master unit corresponding to the system call code also stores data for distinguishing between the master and the slave at the same time.

If the received control signal is a control signal of a system to which the slave unit belongs, the content of the received control signal is determined, and the slave unit is determined by the connection request signal included in the control signal. When it is determined that it is being called, the slave unit is caused to perform the corresponding operation. When each of the slave units is called by this connection request signal, a communication is performed with the base unit for an extension call or an outside line call, and a communication is performed with another slave unit for the extension call. May be performed. When it is desired to make a call from each slave unit for an external call or an extension call (extension call with the master unit and a call between slave units), a connection request signal is sent to the master unit using the control channel. To send.

Next, the structure of each of the master units 1, 2 and 3 will be described. The master unit 1 of the master unit and the master units 2 and 3 of the slave unit have the same structure as shown in FIG. That is, similarly to the case of the slave unit, the data received from the slave unit by the antenna 31 is subjected to reception processing by the radio unit 32 and supplied to the modulation / demodulation unit 33 to demodulate the received data. The demodulated received data is transmitted to the ADPCM codec unit 3 via the communication control unit 34.
5, and converts the received digital data of the ADPCM into an analog audio signal. The analog audio signal is supplied to the line interface unit 36 and transmitted to the analog telephone line connection terminal 37 side.

An analog audio signal obtained from the analog telephone line connection terminal 37 side is supplied to the ADPCM codec unit 15 via the line interface unit 36, and A
The digital data is supplied to a modulation / demodulation unit 33 via a communication control unit 34 and modulated for transmission, and the modulated data is wirelessly transmitted from an antenna 31 connected to a wireless unit 32.

A handset 38 is directly connected to the line interface unit 36 so that a telephone call can be made with an outside line via an analog telephone line connection terminal 37. It allows extension calls with the machine. Further, a key input unit 39 is connected to the line interface unit 36 so that various controls such as transmission to an outside line can be performed.

Then, the communication control unit 34 of the master unit
The control signal is transmitted at predetermined intervals using a dedicated channel (frequency band) prepared for transmitting the control signal, and another child device is called by this control signal. In this case, the control signal transmitted from each master unit is transmitted with the system call code set for the control signal added thereto.

Note that the communication control unit 34 of the master unit
A non-volatile memory 34a such as an OM is provided to store a system call code set in the master unit and to store a system call code of another master unit that forms a common system with the master unit. . That is, the memory 34a in the communication control unit 34 stores the system call code of the master unit set as the master.

Then, the communication control unit 34 of the slave master units 2 and 3 performs a process of receiving a control signal transmitted from the master master unit 1. That is, the system call code included in the received control signal is stored in the memory 3 in the communication control unit 34.
It is determined whether or not it matches the system call code stored in 4a, and when they match, it is determined that the transmission source master unit is the master master unit and synchronized with the transmission timing of the control signal from the master unit. The communication control unit 34 controls the transmission of the control signal. In this case, in the present example, the master units 2 and 3 of each slave synchronize with each other based on the timing at which the preamble as the synchronization data, which is the first signal transmitted as the control signal, is received. When there are a plurality of slave master units as in this example, it is necessary to control so that the transmission timings from the slave master units do not overlap.

Next, with such a configuration, each of the master units 1, 2, 3
A description will be given of a state where the control signal is transmitted from the master unit 1 in a state where each slave unit is in a standby state. The transmission by the master unit 1 is performed in a state illustrated in FIG. That is, 625
One transmission of the control signal for μ seconds is continuously performed at a cycle of 125 ms. The period during which the waveform of A in FIG. 4 rises is the period during which the control signal is transmitted.

The slave base units 2 and 3 receive the control signal transmitted from the master base unit 1 and transmit the control signal in synchronization with the reception timing. Here, the control signal is transmitted from the second master unit 2 5 ms after the start of the reception of the master control signal (see FIG. 4B), and the third master unit 3 10 ms later. Transmits a control signal (see FIG. 4C). Therefore, [10 ms + 625 μm
[Sec], the control signals are continuously transmitted from the three master units 1, 2, and 3.

When each of the slave units 4, 5 # is in the standby state, the power supply of the receiving unit (such as the wireless unit 12) is turned off only at the timing when the series of control signals are continuously transmitted. It is turned on periodically. Here, as shown in FIG. 4D, the first (master) master unit 1
From the start of transmission of the control signal from the third master unit 3
The power of the receiving unit is turned on only during a period T _ON during which the transmission of the control signal ends. However, actually, it takes some time (for example, 25 μsec) for the receiving unit to start up, and therefore, the _ON time T _ON is set to the above-mentioned time [10 ms + 625].
μsec] and a rise time of about 25 μsec.

In order to perform such control in each of the slave units 4, 5 #, the timing at which each of the slave units 4, 5 # receives a control signal transmitted from the master unit 1 is detected. Then, the reception is intermittently performed for the period T _{ON based} on this timing. Then, the reception of the period T _ON is performed intermittently at a predetermined cycle. As a cycle for performing the intermittent reception during this period T _{ON, since} the cycle for transmitting the control signal is 125 ms, it may be an integer multiple of this 125 ms. For example,
When the same control signal is repeatedly transmitted from each of the master units 1, 2, and 3 for 1.5 seconds, the reception cycle of the slave unit may be set to 1.5 seconds. .

The _ON time T _ON of each slave unit varies depending on the number of master units of the slave units. However, the storage state of the memory 14a in the communication control unit 14 of each slave unit (the memory stores all slave units The number of slave master units is known from the system call code of the master unit), and the communication control unit 14 can determine an appropriate time T _ON to be turned on.

By performing such control, the operation time of each of the slave units 4, 5 # in the standby state can be greatly reduced. That is, in the case of this example, it is necessary for each of the slave units 4, 5 # to receive control signals from the plurality of master units 1, 2, 3; It is not necessary to always turn on the power of the circuit, and it is sufficient to turn on the circuit only for the above-described period T _ON at predetermined intervals, and the power consumption in the standby state can be significantly reduced. For example, the above setting, that is, the reduction rate R of the power consumption when the receiving cycle is 1.5 seconds and T _ON = (10 ms + 625 μs + 25 μs) is expressed by the following equation.

[0040]

## EQU1 ## R = (10 + 0.625 + 0.025) / 1.
5 × 10 ³ = 7.1 × 10 ^-3

From this equation, it can be seen that the power supply of the receiving section is ON for a period of about 0.7%. As described above, the power consumption can be significantly reduced as compared with the case of always receiving. Therefore, according to this example, even in a cordless telephone having a plurality of base units, it is possible to reduce power consumption in a standby state, which is almost the same as when only one base unit is used. Since the power consumption during standby can be reduced in this way, the duration of the battery built in each child device can be extended. Also,
The number of times that the receiving unit is turned on and off is reduced as compared with the case of individually synchronizing with a plurality of master units, and control in a standby state in the slave unit is simplified. Further, in this example, in order to synchronize the master units 1, 2, and 3, it is not necessary to directly connect the master units 1, 2, and 3 with a signal line or the like. Wiring work and the like when installing a cordless telephone having a base unit are simplified.

In this embodiment, a common cordless telephone system can be set up by using the system call code individually set for each base unit as it is, so that the base unit is added later. Thus, it is possible to easily configure a cordless telephone system including a plurality of base units. That is, each base unit can store the system call code of the master base unit, and each slave unit can store the system call codes of the master and slave base units. Even if the system call code is set, it can be operated as a common cordless telephone system.

In the above embodiment, the slave master unit is
The case where the number of slaves is one has been described,
It can be set freely from a table to an arbitrary number of tables. However, the maximum number of system call codes that can be stored in the memory in the communication control unit of the slave unit is the maximum number.

Further, in the above-described embodiment, the master base unit and the slave base unit are distinguished from each other based on the storage state of the system call code in the memory provided in the master unit and the slave unit. The discrimination between the master and the slave may be made known from the control signal itself by using an additional ID (or other data in the control signal) transmitted after the calling code to indicate the discrimination between the master and the slave.

In the above embodiment, only the system call code of the master unit is stored in the slave unit as the storage of the system call code in the master unit. However, the system call code of the slave base unit may be stored so that the master base unit can identify the entire system configuration of the cordless telephone. If there are multiple slave master units,
The slave base unit may also store the system call code of another slave base unit.

[0046]

According to the present invention, each base unit transmits a control signal in synchronization with a control signal transmitted from a reference base unit, even if the system call codes set in the respective base units are different. Therefore, the transmission timing of the control signal is always constant even if the respective base units are not directly connected to each other by a signal line or the like and synchronized. Therefore, if the operation of the receiving unit for receiving the control signal is performed at a constant timing in each slave unit, the control signals from all the master units can be received, and the time for operating the receiving unit while waiting for reception is greatly reduced. Can be reduced.

In this case, according to the present invention, the system call code individually set for each master unit is used as it is,
Since a common cordless telephone system can be assembled, a base unit can be easily added later to easily configure a cordless telephone system including a plurality of base units.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram of a cordless telephone according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of a child device according to one embodiment.

FIG. 3 is a configuration diagram of a parent device according to one embodiment.

FIG. 4 is a timing chart showing a transmission / reception state of a control signal according to one embodiment.

FIG. 5 is an explanatory diagram showing a configuration of a control signal according to one embodiment.

FIG. 6 is an explanatory diagram illustrating a configuration of an identification code according to an embodiment;

FIG. 7 is a configuration diagram showing a system configuration of a conventional cordless telephone device.

FIG. 8 is a configuration diagram showing a communication system.

FIG. 9 is a timing chart showing a transmission / reception state of a conventional control signal.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st master (master master) 2 2nd master (slave master) 3 3rd master (slave master) 4,5,6,7,8 Slave unit 12,32 Radio unit 13, 33 Modulation / demodulation unit 14, 34 Communication control unit 14a, 34a Memory

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04Q 7/38 H04B 7/26

Claims (3)

(57) [Claims] An apparatus comprising: a plurality of master units; and a plurality of slave units, wherein a telephone call is made between the master unit and the slave units by making transmission and reception of digital data different in time . Can do
In a digital cordless telephone device, different system call codes are set for the plurality of base units.
And the plurality of slave units communicate with the different system call codes.
Received and identified, and between any of the above master units
Digital cordless phone that allows you to talk
An apparatus, wherein a control signal transmitted from a predetermined master among the plurality of masters is used as a reference control signal, and the master differs from the predetermined master.
Is received at the, in synchronism with the reception timing of the control signals, a digital cordless telephone apparatus adapted to transmit a control signal from a different base unit and the predetermined base unit. 2. The control transmitted from the master unit serving as the reference.
When signals are intermittently received by the slave unit, the plurality of master units
To receive control signals transmitted synchronously from
2. The digital cordless telephone device according to claim 1, wherein a period for intermittent reception is set . 3. The slave unit includes a memory for storing system call codes of a plurality of master units. When the slave unit receives the system call code, the slave unit compares the data with the data stored in the memory and matches the data. If
2. The digital cordless telephone device according to claim 1, wherein the digital cordless telephone device is recognized as a master unit of the same system.