JPS61239732A - Cordless telephone system - Google Patents

Abstract

PURPOSE:To realize economical circuit constitution and to eliminate wrong calling trouble and radio wave disturbance by providing a counter which operates all the time, reading it by a CPU and setting an ID code, and further displaying functions of circuit disconnection, connection, holding, transfer, and an interphone, etc., with a bit signal obtained by adding data for control to the ID code. CONSTITUTION:The ID code consists of, for example, four hexadecimal digits, i.e. 16 bits and slave equipment 11 transmits the ID code stored in its internal CPU 3 to master equipment 22 as digital data by radio. The master equipment 22 compares it with an ID code stored in a RAM 10 and transmits the ID code to the slave equipment 11 when they coincide with each other, and the slave equipment side confirms the coincidence and establishes a radio link, so that the master equipment 22 is connected to a telephone circuit a certain time later. Thus, a command signal for circuit connection, disconnection, holding, and transfer is composed of the 16-bit digital signal and four bits as the data for control, i.e. 20 bits and transmitted from the slave equipment to the master equipment to start a telephone call by voice.

Description

Detailed Description of the Invention "Field of Industrial Application" The present invention uses a radio transmitter/receiver connected to a telephone line via a relay as a base unit, and a portable mobile radio unit as a slave unit. The present invention relates to a cordless telephone system that enables functions such as dialing, disconnecting line connection, holding, transferring, and intercom calling after confirming the other party using an ID code and control data.

``Prior Art'' As shown in the schematic block diagram of Figure 3, a cordless telephone that has been known for a long time transmits a signal from a handset αυ to a demodulator (2
), and a composite wave of, for example, a 4.6 KHz sub-carrier and an audio signal is extracted, and the audio signal is passed through the LPF, and the above 4.6 KHz is demodulated by the PLL through the BPF.
z sub tone is detected and the telephone line relay (
几y) is inserted. On the other hand, when calling a handset from a base unit, when the base unit is called from the telephone line, it modulates and transmits a 680 Hz ringtone, which the handset receives and drives the speaker of the handset. It has become. Therefore, the operation of the relay attached to the base unit depends exclusively on the lock frequency of the PLL, so even if there is noise,
．． 6 KHz modulation signal is immediately detected by the PLL, resulting in malfunction, and may also cause radio noise from radios other than the cordless telephone or other cordless telephone radios operating in the same frequency band. The ringing bell or speaker rings when a call signal is sent from the line.

In the worst case, there is a problem in which a third party is allowed to make a free-riding call on the own call line.The fewer the number of communication channels, the more frequently the malfunction occurs.

In addition, conventional audio and control data are transmitted on the same wireless channel! 1″
'''c'aat6''''''71117 is, for example, JP-A-5
As seen in Publication No. 8-92155, in order to make it possible to send and receive control data during a call without disturbing the call, a storage circuit converts the voice from A/D at a predetermined encoding speed on the transmitting side. The quantized audio is divided into fixed time intervals and read out at a transmission speed that is faster than the above encoding speed.

During the blank time that occurs at regular intervals due to the speed difference between the two, a synchronization signal and control data generated from the control unit at the above transmission speed are inserted, and continuous digital data is sent to the wireless line. On the other hand, the receiving side separates the control data and audio data based on the time position of the received synchronization signal, stores the control data in the control section and the audio data in the reception memory, and reads out the audio data at the encoding speed. After that, D/A conversion is performed and the audio is played back.
It involved a very complex structure.

``Problem to be solved by the invention'' As mentioned above, it is possible to eliminate false call failures and radio interference caused by the same frequency band, and also to easily confirm the communication partner, and to cut off, hold, and transfer multiple lines. In addition, the system, including the intercom function, is designed to be economical and trouble-free due to its circuit configuration.

``Means for Solving the Problems'' In order to achieve the above-mentioned purpose, the present invention provides a constantly operating counter that is controlled according to a program in order to confirm the other party of the call, and reads out the I/O counter by the CPU.
The D code is added to the ID code, and control data is added to the ID code to achieve functions such as line interruption, connection, hold, transfer, and intercom using a 9-bit signal.

"Embodiment" Next, an embodiment of the method of the present invention will be described with reference to FIGS. 1 and 2.

First, in FIG. 1, 11 is a slave device, 22 is a master device, 1 is a receiving section, 2 is a transmitting section, 3 is a CPU detailed in FIG. 2,
4 is an audio frequency amplification section, and 41 is an audio control section for the purpose of preventing howling, which is provided only in the base unit in this embodiment. SP is a speaker, MIC is a microphone,
These can be replaced with a receiver or transmitter,
OB*, who uses a handset because the handset is exclusively portable.
Sm is installed on the line connecting the telephone line (installation) and the main unit,
The switch controlled by the CPU is R4, if there is a negative load. Further, in FIG. 2, 5 is a signal detection unit that detects a digital signal including an ID code and control data as an incoming radio wave, 6 is an input port, 7 is an arithmetic unit, 8 is an Aki crystal mulrator, 9 is a counter, and 10 is a FiRAM. 0 now, I
The I'D code is composed of, for example, 4 hexadecimal digits and 16 bits, and the I'D code stored in the built-in CPU of the slave unit is converted into digital data and sent to the base unit via wireless. is taken in from the CPU board via the signal detector, transmitted to the arithmetic unit, accumulator, and counter, and compared with the ID code stored in the RAM. The wireless link is established only when the handset side confirms the match and the base unit connects to the telephone line after a certain period of time. The bits can be used to create signals for line connection, disconnection, hold, and transfer commands, which can then be sent from the slave unit to the base unit to initiate a voice call.

Next, when the base unit calls the slave unit, the base unit unilaterally transmits data and sounds a ringing tone to inform the operator that a wireless link has been established.

In Figure 1, the ID code 16 bits and control data 4
To explain the telephone line disconnection, hold, transfer command, and intercom mode depending on the bit, for example, among the control data, 0 is predetermined as line disconnection, 1 is connection, 2 is hold, and 3 is predetermined. o Now, when connecting the telephone line to the handset, after the wireless link with the base unit is established, S is connected, and then 8+LL, 8i+ are connected. At this time, RY2 enters the INT (extension) side1.
8*, Ss, and S4 are all in an open state and are connected via the telephone line and the base unit. When placing the line on hold from the handset, the handset is on hold while the handset is talking. When the button is pressed, data consisting of control data and ID code is transmitted from the slave device to the parent device, and the parent device receives this data, and switches 8+ and 8 snow are activated based on the instructions from the CPU of the parent device.
SL is opened first and S2 is connected (0) In this state, the load (RL) is connected and the telephone line is in a connected state, but no audio signal is transmitted to the audio amplifier and the telephone line is disconnected or put on hold. Ru.

When the handset presses the transfer button on its own device while in the above-mentioned hold state, it sends the transfer command data consisting of control data 3 and ID code to the parent device, and the parent device transfers the transfer command to its own device.
0 When the operator releases the hook, the CPU outputs Ss, S4. Issue an entry command to Ss. In this state, the phone line is put on hold and the parent,
You can also make intercom calls between handsets.

Then, when you put the handset on hook (put down the handset),
Transfer command data is sent from the slave unit to the base unit again 8*,
Sm opens, y2 enters the (telephone line) side,
Furthermore, SL is connected, S2 is disconnected, and the telephone line that has been held until now is connected to the base unit.

Next, regarding intercom operation, it refers to normal voice communication in which voice modulated by both the parent and child units is demodulated when it is received as a carrier signal.During this intercom operation, the telephone line is on hold or cut off. The phone operation can be started by switching off the hook on the own machine in response to a call from the other party's machine. If the handset goes off-hook while the handset is being called from the base, off-hook data, that is, ID data and control data, will be transmitted in response to the call from the base, and when the base unit receives it, it will receive Ss, Sm, and Sm. Ry2 is Tl13
Since the connection is made to the L side, the intercom operation can be started.0 Then, when one of the parent/child units is hooked up from the above interphone operation, the held telephone line can be connected to the other party.

Next, regarding the hold operation from the base unit, when the base unit is off-hook, that is, the handset is picked up, press the hold button on the own unit, St opens, S enters, and so on.
Since Ss is disconnected, the telephone line is put on hold.0 At this time, S4 is connected, 8s and 8s are disconnected, Ryl is connected, ay
z is in contact with the storage side 0 When the transfer button on the base unit is pressed from this state, the ID code and control data are transmitted to the slave unit.

To explain off-hook here, when the base unit goes off-hook (equivalent to picking up the handset), Ryl, SL, Ss, and 8a in FIG.
Y2 is in contact with the placement side. At this time, 8s, 8s, 8g
is open and the base unit is connected to the telephone line, and the relays and switches mentioned above are controlled by direct commands from the CPU of the base unit.Both the base unit and slave unit can go off-hook.0
Next, to explain dialing, the base unit dials after going off-hook, but the base unit's CPU directly connects relays R and y1, and l(, y2 connects to the set side. At this time, St, Sm, and 8 are open and the base unit is connected to the telephone line, and the relays and switches mentioned above are controlled by direct commands from the CPU of the base unit. Both handsets can go off-hook.

Next, to explain dialing, the base unit dials after the off-footer, and the CPU of the base unit directly controls relay Ryl. For dialing from the handset, after establishing a wireless link with the base unit, a dialing signal is sent to the base unit using control data that does not include an ID code, and if the slave unit confirms the match by replying to the slave unit, the dialing signal is sent to the base unit. can send dial pulses to the telephone line.

Then, when one of the parent/child units is turned on-hook from the above-mentioned interphone operation, the held telephone line can be connected to the other party.

``Effects of the Invention'' Therefore, according to the present invention, malfunctions due to noise and interference radio waves are less common than in the conventional control method using signals in the sub-carrier or audio frequency band, and the ID Since a communication line can only be established with a handset with a matching code, problems such as erroneous calls or connections to the wrong company can be prevented.

Furthermore, by simply adding a CPU including memory to a conventional wireless transceiver, various modes such as ID code confirmation, telephone line connection, transfer, and hold can be realized with a simple configuration.

Note that since the ID code can be easily changed between the parent and slave units, there is an advantage that even if the ID code is duplicated with another station's ID code, it can be changed without any problem.

[Brief explanation of the drawing]

Fig. 1 is a block wiring diagram of a cordless telephone device implementing the method of the present invention, Fig. 2 is a block wiring diagram of main parts for detecting, counting, confirming, and command sending of ID codes and control data, and Fig. 3 is 1 is a block diagram of a conventional cordless telephone controlled by subcarrier signals; FIG. ll: Child unit 22: Base unit 1: Receiving unit/2: Transmitting unit 3: CPU 4: Audio frequency amplification unit 5: Signal detection unit 6: Port 7; Arithmetic unit 8: Aki tamulator 9: Counter 10: R, A.M.

Claims (1)

[Claims] A wireless transmitter/receiver connected to an existing telephone line via a relay is used as a master station, and voice and digital data are transmitted between a mobile handset with wireless transmitting and receiving functions via the same radio frequency channel. In a cordless telephone capable of making calls, at least the ID code and control data are received by the respective receivers of both the parent and child stations, and the first one is sent to the transmitter via the CPU.
and a second extension to the audio frequency amplification section provided upstream of the transmitter, and the reception signal is transmitted to the second extension of the base unit connected to a transmitter having a switch in each audio path. A cordless telephone system characterized in that the first and second extension sides and the telephone line side are selectively switched by controlling a handset according to connection, disconnection, hold, transfer, and interphone functions of the telephone line.