JP3051042B2 - Method for preventing misplacement of portable wireless device and portable wireless device with misplacement prevention function - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for preventing a portable radio device such as a radio telephone device and a radio calling device from being left behind, and a portable radio device provided with a function for preventing the device from being left behind by using the method.

[0002]

2. Description of the Related Art FIG. 3 is a block diagram showing a configuration of a conventional radio telephone apparatus. A radio telephone signal transmitted from a base station 1 via an antenna 2 is received by an oscillator 5 in a receiving section 3 of the radio telephone apparatus 11. The signal is converted into a baseband signal (voice) using the local oscillation signal from the controller 6 and output to the speaker 8 via the control unit 6. The baseband signal (sound) from the microphone 9 is sent to the transmission unit 4 via the control unit 6, where it is converted into a radio telephone signal and transmitted from the antenna 2. The operation unit 10 includes a push button dial, a switch, and the like.
Perform operations such as calling. The operating state of the wireless telephone device 11, the destination number at the time of transmission, and the like are displayed on the display unit 7.

[0003] The control unit 6 controls the synthesizer 5 so as to intermittently receive a control channel about once every 1 minute to 30 seconds when not in a call.
The synthesizer 5 is controlled so as to continuously receive the assigned channel.

[0004] In the case of a radio paging apparatus, the other configuration is the same except that the transmitter 4 and the microphone 9 are not provided in FIG.

[0005]

SUMMARY OF THE INVENTION A radio telephone device and a radio calling device are carried around and carried.
They may be left behind. However, no measures have been taken in the conventional portable wireless device to prevent this misplacement.
SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for preventing a portable wireless device from being left behind, which realizes a function to prevent the device from being left behind, and a portable wireless device to which a function for preventing the device from being left behind is added by using the method.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a method for preventing a portable wireless device from being left behind, which receives a radio frequency signal, converts the signal into a baseband signal based on a local oscillation signal output from a synthesizer, and performs reception processing. A portable device for transmitting a monitoring signal having a frequency different from the radio frequency signal, and a portable device housed in a separate housing from the portable radio device. A local oscillation signal for converting a signal to a baseband signal is alternately output from the synthesizer to generate a baseband signal or a baseband monitoring signal alternately, and the baseband monitoring signal is checked. This is achieved by assuming that the portable wireless device is left behind and outputting an alarm sound from a speaker provided in the portable wireless device.

[0007]

The slave unit is a very simple and small circuit. If the slave unit is not separated from the body or the vicinity of the body, when the unit is separated from the main unit, it can be known by an alarm sound.
Therefore, only a simple switching means and a control function are added to the main body, and a misplacement prevention function can be added at low cost. Also, if the child device is put in luggage, it is possible to prevent the luggage from being left behind or being left behind.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to embodiments. FIG. 1 is a block diagram showing an embodiment of a wireless telephone device according to the present invention. The wireless telephone device comprises a main body 12 of the wireless telephone device and a slave unit 13 housed in a housing separate from the main body. The structure of the main body 12 is substantially the same as the conventional one shown in FIG. 3, and the same circuits or members are denoted by the same reference numerals. What is different is the configuration of the control unit 6A. The slave unit 13 is added for preventing the user from being left behind. The slave unit 13 includes an oscillator 16, a control unit 17, a transmission unit 18, an antenna 19, and a battery 20 for supplying power to these circuits.

Next, the operation of this embodiment will be described. Figure 2 shows the spectrum of a signal in each part of this embodiment, the monitoring signal P _RF from the radio telephone signal S _RF and the slave unit are both in the signal having a frequency in the UHF band, and different that frequency Shall be. The control unit 6A controls the radio telephone signal S
A local oscillation signal for converting the _RF or monitor signals P _RF monitoring signal P _BB telephone signal S _BB or baseband baseband synthesizer 5 performs control so that output alternately. As a result, the baseband telephone signal _SBB and the baseband monitoring signal _PBB are alternately output from the receiving unit 3 and sent to the control unit 6A.

[0010] Here, as the monitor signal P _RF from the slave unit 13 to the single-frequency signal. The control unit 6A, when the signal S _BB to the input signal is dropped signal S _RF to baseband,
This is demodulated and sent to the speaker 8. When the input signal is the signal P _{BB obtained} by dropping the monitor signal P _RIF to the baseband, the level of the signal P _BB is checked. When this level is equal to or less than a predetermined value, it is considered that the slave unit 13 and the main body 12 are separated, and the control unit 6A outputs an alarm by sounding the speaker 8. Therefore, if the slave unit 13 is always worn or held close to the body, it is possible to know that the main unit has been left behind by the sound of the speaker.

Note that while the monitoring signal _PRF is being selected, the original radio telephone signal is not received. For this reason, in order to perform monitoring while being connected to the base station, the monitoring signal P
_It is necessary to reduce the frequency of selecting _RF and the time of one connection as much as possible. However, it is sufficient to perform monitoring once every two seconds, for example, and it can be checked in a very short time, so that the influence on ordinary calls and the like is small. Also, since misplacement usually occurs when not in use,
When in a state of connection with the base station or at the time of receiving a call signal, by stopping the periodic switching and always selecting the signal _SRF side, it is possible to eliminate the influence on the communication.

In particular, TDMA system (time division multiplex system)
In the case of the wireless telephone device, the wireless telephone device extracts only the time slot addressed to itself from the input data, temporarily stores it in a buffer, and reads out the buffer again to reproduce a continuous audio signal. Since data other than the time slot addressed to the own device is discarded, if the connection is made to the monitoring signal _PRF side in synchronization with the time slot other than the own device, the transmitted data is not lost. You can monitor for misplaced items.

In the above embodiment, the monitoring signal is a single-frequency signal. However, the signal is modulated with a constant code, and the control unit 6A that receives the signal modifies the signal with the constant code instead of the reception level of the monitoring signal. May be checked, and if the error rate exceeds a predetermined value, an alarm is issued.

The antenna 19 of the slave unit 13 is
When the main body 12 is slightly separated from the main body, it is only necessary to regard the main body 12 as being left behind. Therefore, a performance capable of transmitting a monitoring signal within a distance considered to be sufficient is sufficient. Therefore, a small and simple antenna may be used as the antenna. The slave unit added for the present invention, including this antenna, may have a simple circuit configuration such as a low-power oscillator, and is small, portable, and inexpensive.

It is also possible to prepare a plurality of slave units and assign monitor signals _PRF having different frequencies to each of the slave units. In this case, if the child device is attached to luggage or the like, it is possible to prevent misplacement or luggage of luggage.

In the above description, the embodiment of the wireless telephone device has been described. However, in the case of the wireless calling device, the configuration is the same except that the transmitting unit 4 and the microphone 9 shown in FIG. 1 are not provided. Has the same effect as.

[0017]

According to the present invention, by using a small and inexpensive handset, there is an effect that a function of preventing a telephone from being left behind can be added to a wireless telephone device or a wireless calling device.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of a wireless telephone device according to the present invention.

FIG. 2 is a diagram showing a spectrum of each signal in the embodiment of FIG. 1;

FIG. 3 is a block diagram showing a conventional wireless telephone device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base station 2 Antenna 3 Receiving part 5 Synthesizer 6A Control part 8 Speaker 12 Main body 13 Handset

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) H04B 1/38 H04B 7/26 H04M 1/00 H04Q ⁷ /00-7/38

Claims (6)

(57) [Claims] 1. A portable radio device which receives a radio frequency signal, converts the signal into a baseband signal by a local oscillation signal output from a synthesizer, and performs a reception process, wherein the radio frequency signal is different from the radio frequency signal. A portable device for transmitting a monitoring signal having a frequency is provided, which is housed in a separate housing from the portable wireless device. The portable wireless device converts the radio frequency signal or the monitoring signal into a baseband signal. A baseband signal or a baseband monitoring signal is alternately generated by outputting a local transmission signal for performing the operation from the synthesizer alternately, and the baseband monitoring signal is checked. Is output from a speaker provided in the portable wireless device. 2. The method according to claim 1, wherein the alternate generation of the baseband signal and the baseband monitoring signal and the check of the baseband monitoring signal are performed only when the portable radio device is not connected to the base station. The method for preventing the portable wireless device from being left behind according to claim 1. 3. When the portable radio apparatus is a digital apparatus multiplexed by time division multiplexing, the generation of the baseband signal and the baseband monitoring signal alternately and the check of the baseband monitoring signal are performed by the above-mentioned method. 2. The method for preventing a portable wireless device from being left behind according to claim 1, wherein the method is performed in synchronization with a time slot other than a time slot addressed to the own device among time slots for time division multiplexing. 4. The monitor signal transmitted by the slave unit is a single-frequency signal, and the check is a level check of the monitor signal converted into a baseband.
The method for preventing a portable wireless device from being left behind. 5. The monitoring signal transmitted by the slave unit is a modulation signal with a fixed code, and the checking is a check of a code error rate of the monitoring signal converted into a baseband. For preventing the portable wireless device from being left behind. 6. A main body and a slave unit housed in a separate housing from the main body, wherein the main body is different from an antenna and a high-frequency signal received from the antenna from a base station or the high-frequency signal. A converter for converting a monitoring signal from the slave unit having a frequency into a baseband signal; a synthesizer for supplying a local oscillation signal to the converter; and a high-frequency signal from the base station or monitoring from the slave unit Control means for controlling the synthesizer such that the local oscillation signal for converting the signal to the baseband signal is output alternately, and monitoring the signal obtained by converting the monitoring signal to baseband,
Abnormality detecting means for outputting a signal for notifying abnormality if there is an abnormality, the slave unit includes: a monitoring signal generation circuit for generating the monitoring signal; and a transmission signal for transmitting the monitoring signal generated by the circuit. A portable wireless device with a misplacement prevention function, comprising: a handset antenna;