JP3474935B2 - 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 having a direct call (transceiver) function between handset units.

[0002]

2. Description of the Related Art A system in which a cordless telephone sub-unit is brought out outdoors and a public service can be used like a portable telephone is a simple portable telephone system or PH.
It is called S (Personal Handyphone System), and its practical application is being pursued. Further, since it is a digital system, it is also called a digital cordless telephone device, and the confidential communication function is enhanced and the communication quality is improved.

Specifically, as in the case of a conventional analog cordless telephone, the child device can communicate with the other party through the home parent device connected to the telephone line, and in places where people are crowded, such as outdoors or on the premises of a station. It is possible to talk with the other party via the public base station installed at. That is, it is possible to use a slave unit with a small electric power (10 mW or less) as a mobile phone on the assumption that the slave unit can be brought out anywhere to enter the communication area of any public base station.

The frequency band used is 1.9 GH.
The z band is assigned, and the connection method is TD of four-wave multiplexing.
MA method, TDD method for transmission, and π / for modulation method
The 4-shift QPSK method is 32 as the voice encoding method.
The Kbps ADPCM system is adopted respectively, and other details are defined in STD-28 issued by the Radio System Development Center.

On the other hand, in the PHS, as an auxiliary communication function, a direct call mode between the handset units, which enables direct call between a plurality of handset units registered in the same base unit (that is, a call that does not go through the base unit) The so-called transceiver mode can be used (the communicable distance in that case is about 100 to 150 m). Specifically, the two target slave units call the partner slave unit by designating their respective call code numbers (slave unit numbers), and talk with each other.

In this case, the calling handset scans about 10 communication channels set for private use and selects an empty channel before starting transmission (this is called carrier sense) before transmission. Is supposed to start. On the other hand, the called handset scans all available call channels to detect which call channel is being called and makes a call with the calling handset through that call channel. (Note that such a connection method is called a cyclic indefinite method).

[0007]

However, the above-mentioned S
In TD-28, when using the handset in transceiver mode, the available communication time is limited to 3 minutes or less in order to prevent one call channel from being occupied for a long time. Stipulates a 2-second rest period. Therefore, the slave unit is designed to measure the specified time. Then, if three minutes have passed after the call was made (or the call was received), the call channel must be disconnected.

Therefore, when it is necessary to make a call for more than the specified 3 minutes, the user has to perform a call operation again after the call is disconnected. This is an extremely troublesome operation in use. Then, the user must make sure to remember the cordless handset number of the other party to make subsequent re-calls. In addition, it is a common experience to remember the message immediately after ending the call and call back immediately, but in such a case, even if the call is redone within the two-second rest period, Since it is not possible to make a call request to the other party, the re-calling operation is completely useless.

The present invention has been made to solve such a problem, and provides a digital cordless telephone device which can smoothly resume a call when a call with a time restriction is made by using a transceiver function. The purpose is to do.

[0010]

In order to achieve the above object, the present invention according to claim 1 makes it possible to make a call with a partner via a base unit or a public base station of a destination by wireless communication. What is claimed is: 1.A digital cordless telephone device having a certain slave unit and capable of directly talking between a plurality of slave units registered in the same master unit, wherein the slave unit has a timer for measuring a talk time. , A scheduled call time setting means for setting a scheduled call time exceeding the regulated call time to the timer, a call number storage means for storing the call number of the call destination slave, and a call after the regulated call time has elapsed When the call is disconnected, if it is within the set scheduled call time, the call recalling means for recalling the same callee slave using the stored call number is provided. There is.

The invention according to claim 2 has a slave unit capable of communicating with the other party via a master unit or a public base station of a moving destination by wireless communication, and the same master unit. A digital cordless telephone device capable of making a direct call between a plurality of cordless handsets registered in, the cordless handset comprising:
A timer that keeps track of the call time and the calling number of the other party
Call number storage means to store the number and regulatory suspension after disconnecting the call
If there is a re-call operation within the suspension period, the regulation suspension period
When the time has passed, it is stored in the calling number storage means.
Using the calling number
It is characterized by having means for recalling .

[0012]

According to the structure of the invention described in claim 1, the digital cordless telephone device of the present invention is a slave unit capable of communicating with the other party via the master unit or the public base station of the destination by wireless communication. In addition, it is possible to directly talk between a plurality of slave units registered in the same master unit.

Next, in the slave unit, a call time is measured by a timer. Further, the scheduled call time setting means sets the scheduled call time exceeding the regulated call time on the timer. Further, the calling number storage means is configured to store the calling number of the handset, which is the other party of the call. Then, when the call is disconnected after the stipulated call time elapses, and when the time is within the set call time, the re-calling means uses the stored calling number to identify the same call destination. A call is reissued to the child machine.

Further, according to the configuration of the invention described in claim 2, in the slave, the call time is measured by the timer. Recall operation within the regulation suspension period after disconnecting the call
If there is, the regulation suspension period after the call disconnection has elapsed.
When the call is reissued, it is stored in the calling number storage means
The called number is used to make a re-call to the destination slave.

As a result of the above, even when the regulated call time has elapsed, as long as it is within the scheduled call time, the call is reissued to the same destination slave without re-calling. In addition, even if a call recall operation is performed within the regulation suspension period after the call is disconnected, a recalling call is made to the same partner child predecessor unit after the suspension period has elapsed without redialing. Be seen.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a block diagram showing a circuit configuration of a slave unit of a digital cordless telephone device according to the present invention. The configuration of this cordless telephone will be described below along with its operation. First, on the receiving side, only the input received RF signal is extracted and amplified by the RF filter and RF amplifier (AMP) circuit 1 from the high frequency signal (hereinafter referred to as RF signal) input from the antenna. It is like this. The tuning VCO-RX (voltage controlled oscillator) 7 is composed of TCXO (temperature-compensated crystal oscillator, that is, a crystal oscillator with temperature compensation), and is controlled by a control signal from the CPU 23. PL driven
A signal from an L frequency synthesizer (variable frequency divider) 9 is received to generate a reference clock. Then, the reference clock and the RF signal from the RF filter and RF amplifier circuit 1 are mixed by the first (1ST) MIX circuit 2, and only the difference in the frequency spectrum generated by using the nonlinear portion of the transistor is detected by the IF filter and IF amplifier circuit 3
It is designed to be taken out through. The signal thus extracted is the first intermediate frequency signal.

Next, a constant clock signal is generated by the VCO-IF 8 using the TCXO or another oscillation circuit, and this clock signal and the first intermediate frequency signal are supplied to the second (2ND) circuit. In the MIX circuit 4, the above-mentioned first
Mixing is performed by a method similar to the method of extracting the intermediate frequency signal, and the second intermediate frequency signal is extracted through the IF filter and IF amplifier circuit 5. And this second
Intermediate frequency signal is demodulated by demodulation circuit 6 by π / 4 shift 4-phase QPS
K demodulate. At this time, the IF filter and IF amplifier circuit 5 and the demodulation circuit 6 simultaneously detect the input level.

Thereafter, the TDM processing circuit 19 performs TDM.
A processing is performed, and for the audio signal portion, D / A
A conversion circuit 17 performs ADPCM / PCM D / A conversion. Further, the audio signal is amplified by the audio processing circuit 18, and BP
The F control (frequency band limitation) process is performed, and subsequently, the line control circuit 15 performs an amplification process and an impedance conversion process to obtain a signal that can be supplied to a speaker, an earphone, etc., and the speaker output. Further, the line control circuit 15 performs control such as ringer output for notifying an incoming call and connection with a telephone line.

Data such as a message is demodulated by the demodulation circuit 6 and then demodulated by the TDMA processing circuit 19.
Then, in accordance with a control signal from the CPU 23, the data demodulation circuit 20 including a gate array, a DSP (digital signal processor), etc., performs processes such as decoding and error correction. Then, these data are stored in the memory (RAM) 230 in the CPU 23, and the CPU 23 performs the processing based on the stored data (message and the like).

On the other hand, on the transmitting side, the voice signal from the microphone emitted by the user is converted into an electric signal by the line control circuit 15, and further, the ADP conversion circuit 14 performs ADP.
Digital processing of CM / PCM is performed. For data such as messages, various tables in the memory 230 are used under the control of the CPU 23.
The data modulation circuit 21 performs code conversion and error correction. For digital data such as voice and data, the TDMA processing circuit 19 performs TDMA processing, and then the modulation and MIX circuit 12 performs π / 4 shift 4-phase QPS.
Modulation of K is applied, and V according to the set channel is added.
It is mixed with the clock signal from the CO-TX 11. Then, only the necessary frequency component is taken out by the RF filter and RF amplifier circuit 13, further power-amplified by the power amplifier, and only the output component is efficiently transmitted through the antenna.

Further, in the figure, a display and key (KEY) processing circuit 24 controls a display element such as an LED or LCD and an input key. The main unit can switch between the telephone mode and the transceiver mode by key processing. Then, for example, when the handset 1 makes a call in the transceiver mode between the handset 1 and the handset 2 registered in the same handset, and when the handset 2 enters the call state, In the CPU 23, the attached timer 231 is used to measure 3 minutes (which is the time defined as the call time limit) from the call origination or the call arrival, and 3
When the minutes have passed, the call channel is immediately disconnected.

In the DTMF generating circuit 22, the DTM
Generation of F, melody, etc. is performed according to an instruction from the CPU 23. FIG. 2 is a flowchart showing control in the transceiver mode performed by the CPU 23 shown in FIG. First, the system is initialized (S1). Then, it is determined whether or not the transceiver mode is set (S2). Then, when the transceiver mode is set (Yes in S2), a standby process for a direct call between the handset units is performed (S3).

Next, when the calling between the slaves is turned on, that is, when the flag indicating that the slave is the calling side is standing (Yes in S4), the prescribed 3 minutes are exceeded. When there is a possibility that a call may be made, if the user inputs a key for the planned call time (Yes in S5), the inputted planned call time is set in the timer 231 (S6). Further, when the user inputs the calling number of the partner side device by key input (Yes in S7).
In the case of S), the calling number is stored in the memory 230 (S
8). Subsequently, a calling process is performed on the partner side handset (S9), and the process shifts to a control process during a call. (S10) If No in step S4, that is, if the flag indicating the calling side is not set, it is confirmed that there is an incoming call between the handset units (Yes in S11). In this case, the incoming call process between the slave units is executed (S
12) and shifts to the control process during a call (S10).

If No in step S2,
That is, when it is not the transceiver mode, the processing in the normal telephone mode is executed (S13). FIG. 3 is a continuation of the flowchart shown in FIG. 2 and is a flowchart showing the control processing after the call is disconnected in the transceiver mode. During the call in the transceiver mode, if it is confirmed that 3 minutes have passed by the time counting operation of the timer 231 (Yes in S21), the call disconnection process is executed (S22).

Subsequently, before the start of the call, the user sets the scheduled call time by key operation (note that the specified 3 minutes is 1 minute).
As the number of calls, it may be configured to set a scheduled number of calls) (S2).
3). This is because if the user is expected to spend more than 3 minutes in the transceed mode,
By setting the expected call time (or the number of calls), even after 3 minutes have passed, as long as it is within the set time (or the number of calls), it is not necessary to redial. is there.

If the scheduled call time (or the scheduled number of calls) has not elapsed (No in S23), the calling number of the destination slave unit stored in the memory 230 is used to reoccur. A call (that is, a call start request) is processed (S24), and the process proceeds to step S10. When the planned call time (or the planned number of calls) has elapsed (Yes in S23), the transceiver mode is turned off (S25), and the process proceeds to step S2.

By controlling in this way, even if the call is disconnected after the stipulated 3 minutes have passed during the call, the user does not have to perform the key operation again to request the call. On the other hand, it is often experienced to remember the business immediately after ending the call and call back immediately. No call request operation is performed. Therefore, in the case of No in step S21 and when the call is ended (in the case of Yes in S26)
Performs a call disconnection process (S27), but if the user performs a recall operation for a call request immediately after the call is disconnected (Yes in S28),
The timer 231 waits for the stipulated 2-second pause period to pass (Yes in S29), and the recalling process is performed using the calling number of the destination slave unit stored in the memory 230 (S30). If No in step S28, the transceiver mode is turned off (S31),
The process moves to step S2.

By controlling in this way, the user can make a call again for a call request immediately after the call ends without being aware of the pause period after the call is disconnected. In addition, when the user makes a call again immediately after the call is disconnected, the processing of S26 to S31 is performed as an independent processing, and the calling number of the partner's child device is stored, and the specified 2-second pause period is stored. It may be configured to call again at the same time.

[0029]

As described above, according to the present invention, even when using a transceiver function with a time restriction of a call time or a pause period after disconnecting a call, a digital cordless telephone device is used, and the user feels inconvenience. It is possible to resume the call without having to do so, which greatly improves usability.

[Brief description of drawings]

FIG. 1 is a block diagram showing a circuit configuration of a slave unit of a digital cordless telephone device according to the present invention.

2 is a flowchart showing control in a transceiver mode performed by a CPU 23 shown in FIG.

FIG. 3 is a flowchart that is a continuation of the flowchart shown in FIG. 2 and shows a control process after the call is disconnected in the transceiver mode.

[Explanation of symbols]

23 CPU 230 memory 231 timer

─────────────────────────────────────────────────── --- Continuation of the front page (56) Reference JP-A-4-185124 (JP, A) JP-A-6-216835 (JP, A) JP-A-63-136731 (JP, A) JP-A-7- 107560 (JP, A) JP-A-7-322353 (JP, A) JP-A-2-150150 (JP, A) JP-A-4-150360 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) H04M 1/00 H04M 1/24-1/253 H04M 1/58-1/62 H04M 1/66-1/82 H04M 15/00-15/38

Claims (2)

(57) [Claims] 1. A plurality of slave units having a slave unit capable of communicating with the other party via a master unit or a public base station of a moving destination by wireless communication, and further, having a plurality of slave units registered in the same master unit. A digital cordless telephone device capable of making a direct call in a mobile phone, wherein the slave sets a timer for measuring a call time, and a scheduled call time for setting a scheduled call time exceeding a regulated call time to the timer. Setting means, calling number storage means for storing the calling number of the other party of the call destination, and stored when the call is disconnected after the regulated call time has passed and within the set scheduled call time. A digital cordless telephone device, comprising: a re-calling means for re-calling the same callee's child device by using a calling number. 2. A plurality of slave units having a slave unit capable of communicating with the other party via a master unit or a public base station of a moving destination by wireless communication, and further having a plurality of slave units registered in the same master unit. Is a digital cordless telephone device capable of making a direct call in a telephone, and the slave unit stores a call number for storing a call time and a call number storage unit for storing a call time of the partner unit.
And if there is a re-call operation within the regulation suspension period after the call is disconnected.
In addition, when the regulation suspension period has passed, the calling number
Using the calling number stored in the storage means,
And a re-calling means for re-calling the digital cordless telephone device.