JPH08265850A - Method for preventing mislaying of portable radio equipment and portable radio equipment with mislaying prevention function - Google Patents

Abstract

PURPOSE: To provide the mislaying preventing function by sending a monitor signal at an intermediate frequency band from a slave set, allowing the main body to monitors sometimes the monitor signal, detecting a distance between the main body and the slave set through the reduced reception level and sounding a ring tone from a speaker for warning. CONSTITUTION: The radio equipment is made up of a main body 12 and a slave set 13 being a separate unit. The slave set 13 sends a monitor signal PIF at an intermediate frequency band from its antenna 19. A changeover section receives a signal at the intermediate frequency band and the monitor signal PIF received by an antenna 15 and they are periodically switched by a control signal C1 from a control section 6A and outputted to an IF amplifier section, a multiplier converts them into a base band signal and it is fed to the control section 6A. The control section 6A checks a level of the received signal when the received signal results from the monitor signal PIF converted into the base band. When the level is less than a prescribed level, it is discriminated that the slave 13 is part from the main body 12 and a speaker 8 sounds a warning.

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 misplacement of a portable wireless device such as a wireless telephone device or a wireless calling device, and a portable wireless device to which a misplacement preventing function is added by using the method.

[0002]

2. Description of the Related Art FIG. 3 is a block diagram showing a configuration of a conventional radiotelephone device. A radiotelephone signal sent from a base station 1 through an antenna 2 is generated by an oscillator 5 at a receiving section 3 of a radiotelephone device 11. Is converted into a baseband signal (voice) using the local oscillation signal from and is output to the speaker 8 via the control unit 6. A baseband signal (voice) from the microphone 9 is sent to the transmitting 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, etc.
Perform operations such as making calls. The operating state of the wireless telephone device 11 and the destination number at the time of transmission are displayed on the display unit 7.

Further, in the case of a wireless calling device, the transmitter 4 is not provided in FIG. 3 and other configurations are the same.

FIG. 4 shows a detailed structure of the receiving section 3, which includes a high frequency amplifier 31, a multiplying section 32 and an IF (intermediate frequency).
The amplification unit 33 and the multiplication unit 34 are included. The radio telephone signal input from the antenna 2 is amplified by the high frequency amplification unit 31, multiplied by the high frequency multiplication signal from the oscillator 5 by the multiplication unit 32, and converted into an IF signal. Then, the signal is amplified again by the IF amplifying unit 33, then multiplied by the IF multiplying signal from the oscillator 5 by the multiplying unit 34, converted into a baseband signal, and output.

[0005]

Since a radio telephone device, a radio calling device, etc. are carried and carried around,
You may forget to leave it. However, the conventional portable wireless device has not taken any measures to prevent this misplacement.
An object of the present invention is to provide a misplacement prevention method for a mobile wireless device that realizes a misplacement prevention function, and a mobile wireless device to which the misplacement prevention function is added using the method.

[0006]

According to the present invention, a portable radio apparatus for receiving a radio frequency signal, converting it to an intermediate frequency signal, amplifying it, and then converting it to a baseband signal for reception processing is prevented. In the method, a slave unit housed in a casing different from a portable wireless device for transmitting a monitor signal in the same frequency band as the intermediate frequency signal and a portable wireless device for receiving the monitor signal are provided. With the attached monitoring antenna, the portable wireless device periodically switches the intermediate frequency signal and the monitoring signal input from the monitoring antenna, and amplifies the signal selected by the switching thereafter. As a conversion input to the baseband signal, when the above monitoring signal is selected and converted to the baseband signal, the converted monitoring signal is checked, and if there is an abnormality, it will be left behind. Is achieved by outputting from the speaker provided a warning sound to a portable wireless device with.

[0007]

The slave unit is a very simple and small circuit, and if it is kept away from the body or the periphery of the body, it can be known by an alarm sound when it is separated from the body.
Therefore, only the simple switching means and the control function are added to the main body, and the misplacement prevention function can be added at a low cost.

[0008]

EXAMPLES The present invention will be described in detail below with reference to examples. FIG. 1 is a block diagram showing an embodiment of the radiotelephone device according to the present invention, which comprises a main body 12 of the radiotelephone device and a slave unit 13 housed in a housing separate from the main body. The structure of the main body 12 is almost the same as the conventional one shown in FIG. 3, and the same reference numerals are given to the same circuits or members. The difference is that the configurations of the receiving unit 3A and the control unit 6A and the antenna 15 are added. The slave unit 13 is added to prevent misplacement, and includes an oscillator 16, a control unit 17, and a transmission unit 1.
8, an antenna 19, and a battery 20 for supplying electric power to each of these circuits.

FIG. 2 is a block diagram showing the configuration of the receiving section 3A. A switching section 35 controlled by a control signal C1 from the control section 6A is added to the circuit shown in FIG.
The antenna 15 is connected to this. The configuration of the other parts is the same as that of the conventional circuit of FIG.

Next, the operation of this embodiment will be described. Generally, when a wireless telephone signal is written as S _RF , this is a signal having a frequency in the UHF band, and this is converted into a signal S _IF in the IF (intermediate frequency) band by the multiplication unit 32 in FIG. As this IF frequency, 455 KHz, 10.7 MHz, or 90 MHz is used. Therefore, as shown in FIG. 5, the monitor signal P _{IF of the} same frequency band as the IF signal S _IF is transmitted from the slave unit 13.
Is sent out from the antenna 19. The IF signal S _IF and the supervisory signal P _IF received by the antenna 15 are input to the switching unit 35 of FIG. 2, and these are periodically switched by the control signal C1 from the control unit 6A and I
It is output to the F amplifier 33. Then, the multiplier 34 converts the baseband signal S _BB or P _BB as shown in FIG.
It is input to the control unit 6A.

Here, the monitor signal P _IF from the handset 13 is a single frequency signal. When the input signal is the signal S _{BB obtained} by dropping the signal S _IF to the base band, the control section 6A
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 _IF to the base band, the level of this signal P _BB is checked. When this level is below a predetermined value, the slave unit 13 and the main unit 1
The control unit 6A outputs an alarm by sounding the speaker 8, assuming that the distance between the two is different. Therefore, if the cordless handset 13 is always worn on the body or held close to the body, it is possible to know that the main body is left behind by the sound of the speaker.

The original radio telephone signal is not received while the switching unit 35 is selecting the supervisory signal P _IF .
For this reason, in order to perform monitoring while in the connection state with the base station, it is necessary to reduce the frequency of selecting the monitoring signal P _IF by the switching unit 35 and the one connection time as much as possible.
However, it suffices to perform monitoring once every two seconds, for example, and since it can be checked in an extremely short time, it has little effect on ordinary calls. Further, since the misplacement occurs when not normally used, the periodic switching is stopped when the connection state with the base station is received or when the ringing signal is received, and the switching unit 35 always keeps the signal S _IF side. If is selected, the influence on communication can be eliminated.

In particular, the 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 the buffer, and reads the buffer again to reproduce a continuous audio signal. Since the data other than the time slot addressed to the own device is discarded, the switching unit 35 is connected to the monitor signal P _RF side in synchronization with the time slot other than the time slot addressed to the own device.
You can monitor misplacement without losing the transmitted data.

Further, although the supervisory signal is a single frequency signal in the above-mentioned embodiment, it is a signal which is modulated with a constant code, and the control unit 6A which has received this has a constant code instead of the reception level of the supervisory signal. The error rate may be checked, and an alarm may be issued when the error rate exceeds a predetermined value.

Further, the antenna 19 of the handset 13 and the antenna 15 of the main body 12 provided opposite to the handset 13 are considered to be misplaced when the handset 13 and the main body 12 are slightly separated from each other. Performance that allows transmission of the monitoring signal within a distance is sufficient. Therefore, this antenna may be small and simple. The slave unit added for the present invention, including this antenna, may have a simple circuit configuration such as a low-power oscillator, is small in size, convenient to carry, and low in cost.

In the above description, the embodiment of the radiotelephone device has been described. However, the radiotelephone device has the same configuration except that the transmitter 4 and the microphone 9 of FIG. Has the same effect as.

[0017]

According to the present invention, there is an effect that a misplacement prevention function can be added to a wireless telephone device or a wireless calling device by using a small and inexpensive slave device.

[Brief description of drawings]

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

FIG. 2 is a block diagram showing a detailed configuration of a receiving unit in FIG.

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

FIG. 4 is a block diagram showing a detailed configuration of a receiving unit in FIG.

FIG. 5 is an explanatory diagram of a reception signal and a supervisory signal.

FIG. 6 is an explanatory diagram of input signal switching processing.

[Explanation of symbols]

 1 Base Station 2 Antenna 3A Receiver 5 Oscillator 6A Controller 8 Speaker 12 Main Body 13 Handset 15 Antenna 32 Multiplier 33 Intermediate Frequency Amplifier 34 Multiplier 35 Switch

Claims (6)

[Claims] 1. A method for preventing misplacement of a portable wireless device, which receives a radio frequency signal, converts it into an intermediate frequency signal, amplifies it, and then converts it into a baseband signal for reception processing. A mobile device for transmitting a monitor signal in the same frequency band as the signal, a slave unit housed in a different housing, and a monitor antenna attached to the mobile wireless device for receiving the monitor signal. At the same time, the portable radio device periodically switches between the intermediate frequency signal and the monitoring signal input from the monitoring antenna, and the signal selected by the switching is used as the subsequent amplification and conversion input to the baseband signal. When the above supervisory signal is selected and converted to a baseband signal, the converted supervisory signal is checked, and if there is an abnormality, it is considered to be misplaced and an alarm sound is output to the mobile radio device. A method for preventing misplacement of a portable wireless device, comprising outputting from a speaker provided in the storage. 2. The mobile radio apparatus according to claim 1, wherein the switching between the intermediate frequency signal and the supervisory signal and the check of the supervisory signal are performed only when the mobile radio apparatus is not connected to the base station. How to prevent misplacement. 3. When the portable radio apparatus is a digital type apparatus multiplexed by time division multiplexing, the selection of the supervisory signal is performed by selecting the time for the self apparatus from the time slots for the time division multiplexing. The method for preventing misplacement of a portable wireless device according to claim 1, wherein the method is performed in synchronization with a time slot other than the slot. 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.
A method for preventing misplacement of a portable wireless device as described above. 5. The monitor signal transmitted by the slave unit is a modulation signal with a constant code, and the check is a code error rate check of the monitor signal converted to baseband. To prevent misplacement of portable wireless devices. 6. A main body and a slave unit housed in a housing separate from the main body, wherein the main body converts a high frequency signal received from the first antenna into an intermediate frequency signal. A first converter, a second antenna, and a switching means for selecting one of the monitoring signal having the same frequency band as the intermediate frequency signal received from the second antenna and the intermediate frequency signal. An intermediate frequency amplification means for amplifying the signal selected by the switching means, a second converter for converting a signal in the intermediate frequency band output from the amplification means into a baseband signal, and the switching means Controlling the switching operation of the second switch, and the second switch when the switching means selects the monitoring signal.
A control circuit having a function of checking whether there is an abnormality in the converter output signal and outputting a signal notifying the abnormality if there is any abnormality, and the slave unit is a monitoring signal generation circuit for generating the monitoring signal. And a portable device antenna for transmitting a monitor signal generated by the circuit, and a portable wireless device with a misplacement prevention function.