JPH098879A - Digital cordless telephone system - Google Patents

Abstract

PURPOSE: To smooth the resuming of communication within a limited time between plural slave sets registered to the same master set by using a timer and a control means. CONSTITUTION: At the time of detecting a call to the present station during intermittent reception in a transceiver mode, a timer 231 is reset and call- incoming operation is executed. During the speech, CPU 23 judges the speaking time by a timer 230. When three minutes passes during the speech, the timer 231 is reset and after the stand-by time of two seconds is passed, the timer 230 is reset again to execute intermittent reception at intervals shorter than normal intermittent reception intervals.

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).

However, in the above-mentioned STD-28, when the slave unit is used in the transceiver mode, in order to prevent one speech channel from being occupied for a long time, the callable time is limited to 3 consecutive minutes or less. Furthermore, it is stipulated that there be a rest period of 2 seconds after the call is ended.
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.

It is often experienced that the user remembers the message immediately after the end of the call and immediately calls back. In such a case, the call is redone within the above-mentioned two-second rest period. However, the call cannot be requested to the other party, and the re-calling operation is completely useless.

The applicant of the present invention has already applied for an invention relating to a digital cordless telephone device that solves such a problem (Japanese Patent Application No. 6-237961). That is, in this prior application, a call number storage means for storing the call number of the other party of the call destination is provided, and when the call is disconnected after the regulated call time has elapsed, the same call is made using the stored call number. It is configured to call again to the partner child device.

[0011]

By the way, the slave unit, including the transceiver function, constantly receives data to confirm whether or not there is a call to the local station. However, in order to reduce the power consumption of the battery, this confirmation is performed for a predetermined time. The reception mode is intermittently set every time. Therefore, as in the above-mentioned prior application, even if the calling side automatically re-calls, the called side receives intermittent reception, and thus it takes time to reconnect. there were.

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.

[0013]

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 handset and capable of making a direct call between a plurality of handset registered with the same base unit within a regulated time. A timer for measuring time, an intermittent receiving means for intermittently receiving at a predetermined time interval, a receiving interval setting means for setting a receiving interval of the intermittent receiving means, and a call being disconnected after the regulated call time has elapsed. At this time, a control means for controlling the reception interval setting means is set so that the reception interval of the intermittent reception is set to a second time shorter than the first time in the normal operation mode.

Further, the invention according to claim 2 has a slave unit capable of communicating with the other party via the master unit or the public base station of the moving destination by wireless communication, and the same master unit. A digital cordless telephone device capable of making a direct call within a regulated time between a plurality of handset units registered in, the handset unit having a timer for measuring a call time,
A call means for calling the destination slave device with the input call number of the destination slave device and starting a call, a call number storage means for storing the call number of the input destination slave device, and a call by the timer And a re-calling means for forcibly disconnecting the call when it is detected that the time exceeds the regulated call time, and for re-calling with the call number stored in the call number storage means after a lapse of a predetermined time. It is characterized by that.

Further, the invention according to claim 3 has a slave unit capable of communicating with the other party via the master unit or the public base station of the moving destination by wireless communication, and the same master unit. A digital cordless telephone device capable of making a direct call within a regulated time between a plurality of cordless handsets registered in, wherein the cordless handset has a timer for counting the talk time and an input destination. A call means for calling the destination slave unit with the call number of the slave unit to start a call, a call number storage unit for storing the input call number of the destination slave unit, and a call time controlled by the timer When it is detected that the number exceeds the limit, the call is forcibly disconnected, and after a predetermined time elapses, the re-initiating means that re-initiates the call with the call number stored in the call number storage means and intermittently at predetermined time intervals Intermittent receiving means for receiving Reception interval setting means for setting the reception interval of the intermittent receiving means, and when the call is disconnected after the regulated call time elapses after the incoming call, the reception interval of the intermittent reception is set to be longer than the first time in the normal operation mode. And a control means for controlling the reception interval setting means so as to set the second short time.

[0016]

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 make a direct call between a plurality of child devices registered in the same parent device within the regulated time.

The slave unit is configured to receive data intermittently, and starts a call in response to a call to its own station. The timer measures the elapsed time from the start of the call, and the call is automatically disconnected when the regulation time is exceeded. When the call is disconnected in this way, the control circuit controls the reception to be performed at intervals shorter than the normal intermittent reception interval, and the presence or absence of a call to the local station is confirmed.

According to the configuration of the invention described in claim 2,
This digital cordless telephone device uses wireless communication to
It has a slave unit that can talk to the other party via the master unit or the public base station of the destination, and it is also possible to talk directly between multiple slave units registered in the same master unit. Is possible.

Next, in the slave unit, a call time is measured by a timer. In addition, the calling number storage means stores the calling number of the handset, which is the other party of the call.

When the call is disconnected after the stipulated call time elapses, the stored call number is used to make a re-call to the same callee slave.

[0021]

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 in 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 demodulation is performed. At this time, the IF filter and IF amplifier circuit 5 and the demodulation circuit 6 simultaneously detect the input level.

Thereafter, the TDMA 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 audio control circuit 15 performs an amplification process and an impedance conversion process for producing a signal that can be supplied to a speaker, an earphone, etc., and outputs the result to the speaker. Further, the voice control circuit 15 controls 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 voice control circuit 15, and further, the ADP is fed by the A / D conversion circuit 14.
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 front view showing the external appearance of a child device of the digital cordless telephone device according to the present invention. The cordless handset is composed of a main body 25 and an opening / closing lid 26 rotatably provided on the main body 25 and provided with a transmission microphone (not shown).

The main body 25 includes a ten-key pad 27, a call key 28 for starting a call, a disconnect key 29 for disconnecting a call, a redial key 30 for redialing, and a catch key 31 used for receiving a call waiting service. , Operation keys such as a function key 32 for selecting various functions, an abbreviated key 33 for calling a pre-registered abbreviated dial, and an extension key 34 for making an extension call, and displaying the remaining battery level and reception status Liquid crystal display 35, receiving speaker 36, antenna 37,
An incoming call lamp 38 and a ringer speaker 39 are provided.

After inputting the telephone number of the other party with the ten keys 27, the call key 28 is operated to make a call through the public line. Further, by operating the function key 32 and the ten-key pad, it is possible to set up in a transceiver mode in which a call is made between a plurality of slave units registered in the same master unit without using a public line. When the transceiver mode is set, a pictogram display 35a indicating the transceiver mode is displayed on the liquid crystal display 35.

In the transceiver mode, after inputting the calling numbers of other slaves registered in the same master with the ten keys 27, the extension key 34 is operated to issue a call to the slave having the calling number. A call is made and a call can be made within the restricted time of 3 minutes. In the transceiver mode, call the other handset by operating the disconnect key 29 or 3
It ends when minutes pass.

FIG. 3 is a flow chart showing the control in the calling operation in the transceiver mode performed by the CPU 23 shown in FIG.

When the user inputs the called number of the called party and operates the extension key 34 in the transceiver mode, it is determined that the call is between the handset units (S1), and the called number of the called party is stored in the memory 230. (S2). After that, a free channel is searched from among the channels allocated for the handset call (S3), the call operation is performed on the searched free channel (S4), and the timer 231 is reset to make a call. Measure the time (S5),
A call is started (S6).

The CPU 23 determines by the timer 230 whether or not the call duration has exceeded 3 minutes (S7), and also determines whether or not the disconnection key 31 has been operated (S).
8). When the call is disconnected by operating the disconnection key 31, disconnection processing is performed (S9) and the processing ends.

On the other hand, when it is determined in S6 that 3 minutes have passed during the call, the disconnection process is performed (S10), the timer 231 is reset (S11), and it is determined whether 2 seconds have passed (S12). ). As described above, when the disconnection is not made by the operation of the disconnection key 31 by the user but is made by the lapse of the regulation time of 3 minutes, the disconnection is often made during the conversation. Therefore, in the present invention, when the waiting time of 2 seconds elapses, an empty channel is automatically searched again (S
3) By making a call to the calling number stored in the memory 230 (S4), a complicated operation for reconnection is not required.

Next, FIG. 4 is a flowchart showing the operation of the slave unit of the digital cordless telephone system according to the present invention in the transceiver mode.

When the power supply is turned on, including the transceiver mode, the slave normally performs intermittent reception in order to confirm whether or not there is a call to its own station. In the transceiver mode, the allocated 10 frequencies are received once every 5 seconds (first time), and the presence or absence of a call to the own station is confirmed (S13). Then, when a call to the own station is detected during this intermittent reception (S14), the timer 231 is reset (S15), the incoming operation is performed, and the call is made while measuring the time (S16). During a call, the CPU 23 determines by the timer 230 whether or not the call duration has exceeded 3 minutes (S17), and also determines whether or not the disconnection key 31 has been operated (S18).
When the call is disconnected by operating the disconnection key 31, disconnection processing is performed (S19) and the processing ends.

On the other hand, when it is determined in S17 that 3 minutes have passed during the call, the disconnection process is performed (S20), the timer 231 is reset (S21), and it is determined whether 2 seconds have passed (S22). ). When the waiting time of 2 seconds has elapsed, the timer 230 is reset again (S23), and intermittent reception is performed at a time interval (second time) shorter than the normal intermittent reception interval of 5 seconds, for example, 1 second. Perform (S24). Then, the call to the own station is judged (S
In the case of 25), the processing from S15 is performed and the call is restarted. When it is determined that there is no call for a predetermined period of time, for example, about 10 seconds (S26), the process returns to S13 and intermittent reception is performed at the first time interval.

As described above, when the disconnection is not made by the operation of the disconnection key 31 by the user but the disconnection is caused by the lapse of the regulation time of 3 minutes, the disconnection is often made during the conversation, and the call is made again. It is possible. Therefore, in the present invention, when the waiting time of 2 seconds has elapsed on the called side, the intermittent reception is performed at an interval shorter than the normal intermittent reception interval, whereby the call can be restarted quickly.

As described above, according to the present invention, the receiving side performs intermittent reception at short intervals in preparation for a re-call.
Normal calling operation is performed continuously for 10 seconds,
As described above, the connection can be established even if the time for re-calling when the call is disconnected due to the lapse of the regulation time of 3 minutes is set to a time shorter than usual, which is about 5 seconds. By shortening the time for re-calling in this way, it is possible to quickly return to the standby state even if the connection cannot be established.

[0041]

As described above, according to the present invention, when a digital cordless telephone device is used and a transceiver function with a time restriction of a call time or a pause period after a call disconnection is used, a quick call restart is possible. It is possible to make a call and it is possible to resume the call without feeling any inconvenience, 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.

FIG. 2 is a front view showing the external appearance of a child device of the digital cordless telephone device according to the present invention.

FIG. 3 is a flowchart showing control at the time of transmission in a transceiver mode performed by CPU 23 shown in FIG.

FIG. 4 is a flowchart showing control upon arrival of an incoming call in a transceiver mode, which is performed by the CPU 23 shown in FIG.

[Explanation of symbols]

 23 CPU 230 Memory 231 Timer

Claims (3)

[Claims] 1. A mobile phone having a mobile phone capable of communicating with the other party via a base phone or a public base station of a moving destination by wireless communication.
Moreover, a digital cordless telephone device capable of directly talking within a restricted time between a plurality of slave units registered in the same master unit, wherein the slave unit has a timer for measuring the talk time, Intermittent reception means for intermittently receiving at a predetermined time interval, reception interval setting means for setting the reception interval of the intermittent reception means, and reception interval for intermittent reception when the call is disconnected after the regulated call time has elapsed. And a control means for controlling the reception interval setting means so as to set the second time shorter than the first time in the normal operation mode. 2. A mobile phone having a mobile phone capable of communicating with the other party via a base phone or a public base station of a moving destination by wireless communication.
Moreover, a digital cordless telephone device capable of making a direct call within a regulated time 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 call means for calling the destination slave unit with the input call number of the destination slave unit and starting a call, a call number storage unit for storing the call number of the input destination slave unit, and a call by the timer And a re-calling means for forcibly disconnecting the call when it is detected that the time exceeds the regulated call time, and for re-calling with the call number stored in the call number storage means after a lapse of a predetermined time. A digital cordless telephone device characterized by the above. 3. A wireless communication device, which has a child device capable of communicating with the other party via a parent device or a public base station of a moving destination,
Moreover, a digital cordless telephone device capable of making a direct call within a regulated time 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 call means for calling the destination slave unit with the input call number of the destination slave unit and starting a call, a call number storage unit for storing the call number of the input destination slave unit, and a call by the timer When the time exceeding the regulated call time is detected, the call is forcibly cut off, and after a predetermined time elapses, the call is recalled using the call number stored in the call number storage means; Intermittent reception means for intermittently receiving at intervals, reception interval setting means for setting the reception interval of the intermittent reception means, and reception of intermittent reception when the call is disconnected after the regulated call time has elapsed after receiving a call. while Digital cordless telephone apparatus, wherein a comprises a control means for controlling the reception interval setting means to set the first second time shorter than the time in the normal operation mode.