JP3135817B2 - Method of preventing portable wireless device from being left behind - 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. (Frequency Division Multiple
Access) or CDMA (CodeDivision Multipl)
The present invention relates to a method for preventing a portable wireless device such as a wireless telephone device and a wireless calling device from being left behind, which transmits and receives data to and from a base station by a method, and a portable wireless device provided with a function for preventing the device from being left behind using the method.

[0002]

2. Description of the Related Art FIG. 2 is a block diagram showing the 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 at 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.

In this radio telephone apparatus, in the case of a system in which transmission and reception with the base station 1 are performed by the FDMA system,
In order to receive the channel designated for the own device, the control unit 6 controls the local oscillation signal corresponding to the channel to be output from the oscillator 5. In the case of a system in which transmission / reception to / from the base station 1 is performed by the CDMA system, a code for spectrum despreading corresponding to the channel designated for the own apparatus is received from the control unit 6. The code is sent to the unit 3 and a decoding process is performed using this code.

[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 transmission signal, and performs reception processing. A portable wireless device for transmitting a monitoring signal having a frequency different from the frequency signal is provided with a slave unit housed in a separate housing, and the portable wireless device transmits the radio frequency signal and the monitoring signal. The receiving unit converts both into a baseband signal, checks the monitoring signal converted into the baseband signal by the conversion, and if there is an abnormality, regards it as misplaced and outputs an alarm sound from a speaker provided in the portable wireless device. A method for preventing a portable wireless device from being left behind is disclosed.

The present invention is characterized in that the receiving unit converts the radio frequency signal and the monitor signal into intermediate frequencies, respectively, and then converts them into baseband signals by digital signal processing. Disclose a method to prevent forgetting.

According to the present invention, a transmission signal is spread spectrum by a modulation code, is converted into a signal in a radio frequency band, receives the transmitted radio frequency signal, converts the signal into a baseband signal, and then demodulates by spectrum despreading. A portable radio apparatus for converting a monitor signal spread spectrum by a modulation code different from the modulation code into a monitor signal having the same frequency as the radio frequency signal and transmitting the monitor signal. The portable radio device receives a high-frequency signal obtained by synthesizing the radio frequency signal and the monitoring signal from the sub-device, and converts this to a baseband signal. Converted,
The transmission signal and the supervisory signal are subjected to spectrum despreading using the modulation code used in the spectrum spreading to simultaneously extract the transmission signal and the baseband supervisory signal. Disclosed is a method for preventing a portable wireless device from being left behind, wherein a warning sound is output from a speaker provided in the portable wireless device on the assumption that the portable wireless device has been forgotten.

[0009]

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.
For this reason, only the control function for monitoring is added to the main body, and the misplacement prevention function can be added at low cost.

[0010]

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. 2, and the same circuits or members are denoted by the same reference numerals. What is different is the configuration of the receiving unit 3A, the oscillator 5A, and the control unit 6A. In addition, the slave unit 13 is added to prevent misplacement.
An oscillator 16, a control unit 17, a transmission unit 18, an antenna 19,
And a battery 20 for supplying power to each of these circuits.

[0011] The receiving unit 3A consist first receiver 3A1 and the second receiving portion 3A2, the first reception unit 3A1 is received and demodulated radio telephone signal S _RF from the base station 1, the second receiver 3
A2 is received and demodulated monitor signal P _RF from the slave unit 13.
These receiving / demodulating operations are as shown in FIG. 3 in the case of the FDMA system. That is, since the monitoring signal P _RF from the radio telephone signal S _RF sub-terminal 13 from the base station 1 is received is multiplexed as a signal having a different frequency, for dropping from the transmitter 5A and the respective to baseband Output the local oscillation signal. Thereby, the baseband signals S _BB (signals from the base station) and P _BB are transmitted from the first and second receiving units 3A1 and 3A2.
(Monitoring signal from the slave unit) is output, and both are input to the control unit 6A.

[0012] Here, as the monitor signal P _RF from the slave unit 13 to the single-frequency signal. Control unit 6A, to the signal S _BB, which dropped signal S _RF to baseband, which demodulates the feed to the speaker 8, for the monitoring signal P _RF signals P _BB was dropped into the baseband, The level of this signal _PBB 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 from each other, and the control unit 6
A outputs an alarm by sounding of the speaker 8.

In the above-described embodiment of the FDMA system, the internal configuration of the first and second receiving units 3A1 and 3A2 may be analog circuits or digital processing. For digital processing, as shown in FIG. 4, a wireless telephone signal S _RF and supervisory signal P _RF of each filter H ₁ (Z), the baseband is subjected to band division filter bank consisting of H ₂ (Z) Into signals, which are
It can be processed by one processor. That is, as shown in FIG. 5, the receiving unit 3A of FIG. 1 is replaced with the signal processing circuit 50 of FIG. In this circuit 50, after sampling the input from the antenna 1 to which the signals _SRF and _PRF are added,
The above filters H ₁ (Z) and H ₂ (Z) are processed (actually sampled after being dropped to the intermediate frequency), and then the output pit stream is thinned out to 1 / M. Here, M is an integer determined by the ratio between the center frequency of the intermediate frequency band and the signal bandwidth. The baseband signals S _BB and P _BB demodulated in this way are input to the control unit 6A, and the same processing as in the above embodiment is performed. The digital processing has a feature that the circuit configuration is simpler than that of the analog circuit.

Next, in the wireless telephone apparatus shown in FIG. 1, a system in which transmission / reception to / from the base station 1 is performed by a CDMA system is called a spread spectrum system. In this manner, by modulating the transmit signal (voice) and S _B modulation codes on the transmitting side as shown in FIG. 6 generates a modulated signal S _W spread frequency band (spread), which the radio telephone signal S _RF Convert and send. On the receiving side dropped to temporarily baseband radio telephone signal S _RF received removed modulated signal S _W, when multiplied by the same modulation code as that used in transmission to the original transmission signal S _B
Is extracted (despreading). But the transmission signal S _B using different modulation codes on the receiving side and the transmitting side can not be restored, the broad spectrum remains signals such as modulation signal S _W. Therefore, if a plurality of signals are modulated with different modulation codes and transmitted, even if those radio telephone signals have the same frequency, a desired transmission signal can be extracted by selecting a modulation code used for demodulation on the receiving side. .

Therefore, as shown in FIG. 7, a radio telephone signal S _RF and a supervisory signal P _RF , which are spread from the base station 1 and the handset 13 using different modulation codes and converted into radio telephone frequencies, respectively.
Is transmitted in the same frequency band, and in the main body 12 of the wireless telephone device, this is received by the receiving unit 3A, and is first converted into a baseband by a base oscillation signal. In this state, the signal from the base station and the signal from the slave unit are both spread and become a baseband signal S ₊ added in a spread state. When the signal is despread by the 2 receiving unit 3A2, the signals S _BB and P _BB from the base station and the slave unit are taken out. Therefore, the outputs are processed and monitored by the control unit 6A as in the case of the FDMA system.

[0016] Thus, in any of the embodiments shown above, because when it is determined that the slave unit 13 and the main body 12 by the level check of the signal P _BB is separated outputs an alarm sound from the speaker 8, thereby preventing misplacement . The cordless phone signal S _RF reception and demodulation for monitoring, because the output to the speaker 8 is never interrupted, speech quality degradation does not occur for the monitor.

In the above embodiment, the monitoring signal is a single frequency signal. However, the monitoring signal is a signal modulated with a constant code, and the control unit 6A receiving 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.

If a plurality of slave units 13 are installed and a different frequency is assigned to each slave unit in the case of the FDMA system, and a different modulation code is assigned to each slave unit in the case of the CDMA system, a plurality of slave units 13 are provided. Machine can be installed. In this case, by attaching the handset to the body and the luggage, it is possible to prevent the wireless telephone device and the wireless calling device from being left behind, and also to prevent the luggage from being left behind or being left behind or getting lost.

In the above description, the embodiment of the radio telephone apparatus has been described.
The configuration is the same except for the absence of the microphone 9 and the same effect as the wireless telephone device.

[0020]

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 block diagram showing a configuration of a conventional wireless telephone device.

FIG. 3 is a diagram showing an analog reception process of the FDMA system.

FIG. 4 is a diagram showing a digital reception process of the FDMA system.

FIG. 5 is an explanatory diagram of a band classification filter bank used in the processing of FIG. 4;

FIG. 6 is an explanatory diagram of a spread spectrum method.

FIG. 7 is a diagram illustrating a reception process of a spread spectrum system.

[Description of Signs] 1 Base station 2 Antenna 3A Receiving unit 5A Oscillator 6A Control unit 8 Speaker 12 Main body 13 Remote unit

Claims (3)

(57) [Claims] 1. A portable wireless device that receives a radio telephone signal obtained by modulating a transmission signal with a first modulation code, converts the signal into a baseband signal, and then restores the transmission signal by despreading. And a slave unit housed in another housing, wherein the slave unit has means for generating a monitoring signal, and the monitoring signal, which is spread spectrum by a second modulation code different from the modulation signal, The portable wireless device receives the wireless telephone signal and the monitoring signal from the slave unit, converts the wireless telephone signal into the monitoring signal in the same frequency band as the wireless frequency, and transmits the wireless telephone signal and the monitoring signal from the slave unit. The baseband signal to which the monitoring signal has been added is
The transmission signal and the monitor signal are extracted by despreading the modulation code of the above and the second modulation code, and the extracted monitor signal is checked. A method for preventing a portable telephone device from being left behind, comprising outputting from a speaker provided. 2. The monitoring signal transmitted by the slave unit is a single-frequency signal, and the checking is a level check of the monitoring signal converted into a baseband.
3. A method for preventing a portable wireless device from being left behind according to item 1. 3. The monitoring signal transmitted by the slave unit is a modulation signal with a fixed code, and the checking is a check on a code error rate of the monitoring signal converted to baseband. The method for preventing a portable wireless device from being left behind.