JP2740009B2 - Wireless communication device - Google Patents

Abstract

PURPOSE:To always display accurate reception electric field strength by correcting reception electric field strength corresponding to a mode in use. CONSTITUTION:The equipment is radio communication equipment for an automobile telephone system, etc., and a storage means 164 which stores the correction data of the reception electric field strength corresponding to the mode in use of the radio communication equipment is provided. When a driving method relating to the reception electric field strength is informed to a user, the reception electric field strength is corrected and informed based on correction data stored in the storage means 164. Thus, it is possible to always display the accurate reception electric field strength by performing the correction of the reception electric field strength corresponding to the mode in use of the radio communication equipment, and displaying corrected reception electric field strength.

Description

DETAILED DESCRIPTION OF THE INVENTION [Purpose of the Invention] (Industrial application field) The present invention relates to a wireless communication device such as an automobile telephone device.

(Prior Art) A car telephone device has a function of detecting a received electric field strength for controlling transmission output and determining whether or not the mobile phone is in a usable area. Also, since it is meaningful for the user to know these facts, it is often performed to display the received electric field strength on a display unit such as a liquid crystal display.

In recent years, portable and in-vehicle wireless telephone devices have been developed and commercialized.

This dual-purpose wireless telephone device is composed of an in-vehicle unit main body attached to the vehicle side, and a portable wireless device that is used by being attached to the in-vehicle unit main body and detached to perform the function of an independent wireless telephone device. Is done.

The control unit, the display unit, the key unit, and the like are provided on the portable wireless device side, and are commonly used in any case.

However, in such a dual-purpose wireless telephone device, the path from the antenna to each unit at the time of reception differs depending on whether the portable wireless device is attached to the in-vehicle unit body and used independently. For this reason, when trying to display the received electric field strength on the display unit as described above, when the portable wireless device is attached to the in-vehicle unit main body and used independently, while having the same received electric field intensity, There was a problem that different display values were obtained.

(Problems to be Solved by the Invention) As described above, in the portable and in-vehicle type wireless telephone device, when the received electric field strength is displayed on the display unit,
There is a problem in that when the portable wireless device is attached to the in-vehicle unit main body and when it is used independently, different display values are obtained even with the same received electric field intensity.

The present invention has been made in order to solve such a problem, and an object of the present invention is to provide a wireless communication device that can always accurately display a received electric field strength.

[Configuration of the Invention] (Means for Solving the Problems) The present invention receives a radio signal arriving via a radio line, measures the received electric field strength of the received signal, and determines the measured received electric field strength. In a wireless communication device that informs a user of related information, storage means for storing correction data of a received electric field intensity according to a use mode of the wireless communication device is provided, and a riding method related to the received electric field intensity is used. When notifying the user, the reception electric field intensity is corrected based on the correction data stored in the storage means, and the notification is performed.

(Operation) In the present invention, the received electric field strength is corrected according to the usage mode of the wireless communication apparatus, and the display is performed based on the corrected received electric field strength. Is performed.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram for explaining an embodiment of a portable and in-vehicle type wireless telephone device according to the present invention.

The wireless telephone device shown in FIG. 1 includes a portable wireless device 100 and an in-vehicle unit main body (adapter unit) 200.

The portable wireless device 100 includes an antenna 101, a changeover switch 102,
A radio unit 103, a control unit 104, and an audio unit for forming a radio line and exchanging signals with a base station (not shown)
An audio / control unit 106 for controlling the entire apparatus including 105, a system ID number of a zone corresponding to a place where the apparatus is registered, and a telephone number corresponding to a place where the apparatus is registered. Registered IDRO
M107, connected to power switch 108, portable radio 129
A power supply control unit 109 for controlling power supply in the vehicle, a rechargeable battery 108 serving as a power supply when carrying, a connection unit 111 connected to the in-vehicle unit main body 200, an operation display unit 112, a speaker 113 for inputting and outputting audible sounds and Microphone 114, output amplifier 115,
The input amplifier 116 constitutes a main part. The operation display unit 112 controls a key unit 117 for performing a predetermined key input, a display unit 118 for performing a predetermined display, a switch unit 119 for performing various types of switching, a key unit 117, a display unit 118, and a switch unit 119. The operation / display control unit 120 to be performed includes a voltage detection circuit 130 that detects a voltage level of the power supply path 130a.

The output amplifier 115 is connected to the audio unit 105 of the portable wireless device 100.
Amplifies the audible sound signal (sound signal) transmitted from the speaker 113 and outputs it from the speaker 113. The input amplifier 116 amplifies an audible sound signal (audio signal) input from the microphone 114. The amplified signal is input to the audio unit 105 of the portable wireless device 100.

The operation / display control unit 120 performs overall control of the operation display unit 112 based on a control signal transmitted from the audio / control unit 106, and also outputs a control signal input from the key unit 117 to the audio / control unit. Send to 106. Display 1
Reference numeral 18 denotes a liquid crystal display and a display driver, which are not shown.
Based on the above control, the liquid crystal display is driven to display, for example, the received electric field strength and the like. The key part 117 is “0” to “9”
Number keys, “*”, “#”, “SND”, “STO”, “EN
D "," RCL "," FCN "," CLR "," EMR "," MUT "
It consists of a keypad (not shown) such as function keys for "E" and "TONE".
It is recognized by the display control unit 120. The switch unit 119 is provided with a hook switch and an ON / OFF switch (not shown), and detects whether the portable wireless device 100 is on-hook or off-hook by the hook switch. Note that the hook switch may also be provided on the in-vehicle unit main body 200. The ON / OFF switch is used to switch ON / OFF of the whole wireless telephone device, and the switching signal is transmitted from the operation / display control unit 120 to the audio / control unit 106.

The in-vehicle main body 200 includes an antenna 201 attached to the vehicle,
A booster 202 that amplifies a signal transmitted and received by the antenna 201 to a constant power, an audio / control unit 203 that performs overall control of the entire in-vehicle unit 200 according to a command from the audio / control unit 106 of the portable wireless device 100, a vehicle battery A power supply control unit 204 that supplies power from B to each unit, the portable wireless device 100
The main part is composed of a connecting part 205 connected to the connecting part 111 via a coaxial cable 300, a speaker 206 and a microphone 207 for inputting and outputting audible sound, an output amplifier 208, and an input amplifier 209. The booster 202 is an antenna duplexer 21
0, a circulator 211, a reception amplifier 212, a transmission amplifier 213, and an automatic power control circuit (APC) 214 for controlling the transmission level of the transmission amplifier 213.

 Next, details of the portable wireless device 100 will be described.

FIG. 2 is a block diagram showing the configuration of the portable wireless device 100 described above in detail.

As shown in the figure, the radio unit 103 includes a demodulator 131, a modulator
132, power amplifier 133, duplexer 144, synthesizer 1
Consists of 35. The demodulator 131 includes the antenna 101, the changeover switch 102, and the duplexer 134 on the portable wireless device 100 side.
, Or via the antenna 201, the booster 202, the changeover switch 102, and the duplexer 134 on the side of the in-vehicle unit 200, and demodulates the received signal from the base station. This signal includes a control signal and an audible sound signal.

 FIG. 3 is a diagram showing the configuration of the demodulator 13.

As shown in the figure, the received signal transmitted from the duplexer 134 is mixed with a predetermined signal generated from the signal source 131b by the mixer 131a, and is amplified by the IF amplifier 131c. Further, the signal is mixed with a predetermined signal generated from the signal source 131e by the mixer 131d, and is amplified by the IF amplifier 131f. Then, it is sent to IF-IC131g.

The IF-IC 131g has a plurality of stages of linear amplifiers 131h,.
After being amplified by 131h, it is transmitted to the audio unit 167.
Further, the IF-IC 131g detects the output of each linear amplifier 131h via the diode 131i, and sends out these detected signals to the A / D converter 131j.

The A / D converter 131j converts a detection signal, which is an analog signal, into a digital signal, and sends the digital signal to the CPU 161.

In this way, the CPU is connected via the diode 131i and the A / D converter 131j.
The signal input to 161 is a received field strength signal. CPU
161 controls the transmission output based on the received electric field strength signal and determines whether or not it is out of the service area.

The modulator 132 modulates an audible sound signal, a control signal, and the like output from the audio / control unit 106 to generate a transmission signal. Power amplifier 133 amplifies the transmission signal output from modulator 132. The duplexer 134 transmits the received signal input via the antenna 101 or the antenna 201 to the demodulator 131 and transmits the transmission signal input via the modulator 132 and the power amplifier 133 to the antenna 101 or the antenna 201.
To send to. The synthesizer 135 is a local oscillator for channel selection, and specifies a frequency to be demodulated by the demodulator 131 and a frequency to be modulated by the modulator 132.

The audio / control unit 106 includes a CPU 161 and an oscillator / divider 1
62, an address decoder 163, a ROM 164, a RAM 165, a radio section control section 166, an audio section 167, a control signal processing section 168, an audio section control section 169, a digital interface 170, and an interrupt controller 171. In the figure, 1
07 is the above-described IDROM, 109 is a power control unit, 172 is an 8-bit data bus, 173 is an address bus, and 174 is a control bus.

The CPU 161 performs overall control of the audio / control unit 106 as a whole. For example, as described above, the diode 131i,
Based on the received electric field strength signal input via the A / D converter 131j, it controls transmission output and determines whether or not the mobile phone is out of service area. Alternatively, the display of the received electric field strength is displayed on the display unit 11.
Let 8 do it. The oscillator / frequency divider 162 supplies a clock to the CPU 161 and divides the frequency of the clock to supply it to each unit as a timing signal. Address decoder 163
Outputs a predetermined operation signal to each unit in response to a command signal from the CPU 161. The ROM 164 stores various programs necessary for the operation of the CPU 161. Further, the ROM 164 stores predetermined data for data correction performed when the display field 118 performs a received electric field strength described later. RAM165
Stores various data during the processing of the CPU 161. The wireless unit control unit 166 controls the wireless unit 103 based on an instruction from the CPU 161. For example, the radio unit control unit 166 instructs a frequency to be commanded by the synthesizer 135, an amplification factor to be amplified by the power amplifier 133, a modulation factor to be modulated by the modulator 132, and the like.
And outputs an out-of-synchronization signal output from the power amplifier 133, an output detection signal, and the like to the CPU 161. The audio unit 167 sends a control signal among the received signals demodulated by the demodulator 131 to the control signal processing unit 168, and sends an audible sound signal among the received signals to the speaker 113 via the output amplifier 115. The audio unit 167 also controls the control signal output from the control signal processing unit 168 and the microphone 114
The audible signal output from the input amplifier 116 via the input amplifier 116 is sent to the modulator 132. The audio unit 167 has a function of shaping the waveform of the control signal to be sent to the control signal processing unit 168 and filtering the control signal to be sent to the modulator 132.

The control signal processing unit 168 performs bit synchronization and frame synchronization with a control signal output from the audio unit 167,
The control data from the base station included in the control signal which is a serial signal is taken in as a parallel signal, and the control data as a parallel signal to be sent to the base station is sent to the audio unit 167 as a control signal which is a serial signal. .

The audio unit control unit 169 performs various controls of the audio unit 167. For example, the audio unit control unit 169 controls switching for transmitting a received signal from the audio unit 167 to either the control signal processing unit 168 or the output amplifier 115,
Switching control for taking in either the control signal processing unit 168 or the transmission signal output from the input amplifier 116 into the audio unit 167 is performed.

Digital interface 170 provides an interface between audio / control unit 106 and operation display unit 112.
The interrupt controller 171 receives an interrupt command from each unit and
Interrupt PU161.

The voltage detection circuit 130 detects the voltage level of the power supply path 130a, and if the voltage of the power supply path 130a is equal to or higher than a predetermined voltage, the power supply changeover switch 108 is connected to the power supply path 130a and the power supply control unit 109. And the changeover switch 102 is driven so that the wireless unit 103 and the booster 202 are connected. Therefore, the portable wireless device 100 is
When the power supply control unit 109 is not connected to the
Power is supplied from 10, and the radio unit 103 is connected to the antenna 101.

Next, the reception field strength, which is a feature of the present invention, is displayed on the display unit 118.
The operation in the case of displaying on the screen is described.

As described above, the voltage detection circuit 130 is connected to the power supply path 130a
Based on the voltage level detection result, it is determined whether or not the portable wireless device 100 is attached to the in-vehicle unit main body 200, and this information is notified to the CPU 161.

Then, when determining that portable wireless device 100 is not mounted on in-vehicle unit main body 200, voltage detection circuit 130 switches changeover switch 102 to antenna 101 side. Therefore, in this case, a reception signal is introduced via the antenna 101, and the reception signal is transmitted from the antenna 101 → the changeover switch 102 → the radio unit 103
(See FIG. 1). In the radio section 103, the transmission / reception duplexer 134 → the demodulator 131 are transmitted (see FIG. 2). In the demodulator 131, the mixer 131a → IF amplifier 131c → mixer 131d → I
F amplifier 131f → IF-IC 131g is transmitted (see FIG. 3). Here, in the IF-IC131g, each linear amplifier
The output of 131h is detected via the diode 131i, and the detected signal is sent to the CPU 161 via the A / D converter 131j as a signal related to the received electric field strength.

On the other hand, when the voltage detection circuit 130 determines that the portable wireless device 100 is attached to the in-vehicle unit main body 200, the changeover switch 1
02 is switched to the in-vehicle unit main body 200 side. Therefore, in this case, a reception signal is introduced via the antenna 201, and the reception signal is transmitted from the antenna 201 → the booster 202 → the connection unit 205 → the changeover switch 102 → the radio unit 103 (see FIG. 1).
After that, a signal relating to the received electric field strength is transmitted to the CPU 161 via each unit as in the case described above.

As described above, the CPU 161 is informed by the voltage detection circuit 130 that the portable wireless device 100 is attached to the in-vehicle unit main body 200.

When the portable wireless device 100 is attached to the in-vehicle unit main body 200, the CPU 161 corrects the signal related to the received electric field strength, and displays the received electric field strength based on the corrected signal related to the received electric field strength. Is performed on the display unit 118.

This correction is performed as follows. The received electric field strength is divided into five levels, for example, as shown in FIG. The first level is -70 dBm or more, the second level is less than -70 dBm, -80 dBm or more, the third level is less than -80 dBm, -90 dBm
Above, the fourth level is less than -90 dBm, more than -100 dBm,
The level is less than -100 dBm (0 dBm: 1 mW / 50
Ω). These thresholds -70 dBm, -80 dBm, -90 dBm,
The digital output of A / D converter 131i corresponding to −100 dBm is R
It is held in OM164. The storage of the digital value corresponding to the threshold value in the ROM is performed as follows. In the initial state, the portable wireless device 100 is used alone, a predetermined transmitter is placed near the antenna 101, and -70 dBm, -80d
It sends out radio signals of Bm, -90dBm and -100dBm output. The portable wireless device 100 outputs the A / D converter 131i at this time,
For example, 50, 60, 70, and 80 are stored in the ROM 164 via the CPU 161 as threshold values corresponding to the respective radio signals. next,
In a state where the portable wireless device 100 and the in-vehicle unit main body 200 are connected, a predetermined transmitter is similarly placed in the vicinity of the antenna 201, and a radio signal of −70 dBm, −80 dBm, −90 dBm, −100 dBm is output to the transmitter. Is sent. The output of the A / D converter 131i at this time, for example, 54, 66, 74, 85 is input to the CPU 161. CPU
161 stores this value in the ROM 164. In this way, the measured value at the time of connection is stored in the ROM 164 as a correction value. During normal operation, correction is performed as follows. The CPU 161 monitors the connection relationship between the portable wireless device 100 and the in-vehicle unit main body 200 in a short cycle, and if the portable wireless device 100 is a single unit, outputs the output of the A / D converter 131i (reception electric field strength) in the ROM 164. Thresholds 50,60,70,80,
90, the received electric field strength is determined to be one of the first to fifth levels, and the result is displayed on the display unit 118. On the other hand, the portable wireless device 100 is
Is detected, the CPU 161 compares the output of the A / D converter 131i (reception electric field strength) with the correction threshold values 54, 66, 74, 85 in the ROM, and Is determined from among the first to fifth levels, and the result is displayed on the display unit 118.

In this way, the received electric field strength detected via the path of the antenna 101 and the received electric field strength detected via the antenna 201 become the same level when the received signal has the same received electric field strength. The correction data is stored in the ROM 164 in advance, and the CPU 161 determines the level of the received electric field strength based on the correction data.

As described above, in the wireless telephone device of the present embodiment, the display unit 118
Accordingly, it is possible to always display an accurate reception electric field strength.

That is, in the dual-purpose wireless telephone device of the present embodiment, when the portable wireless device 100 is mounted on the in-vehicle unit main body 200 and used independently, the antenna 101 is used for reception.
Alternatively, the route from 201 to each part is different.

For this reason, when trying to display the received electric field strength on the display unit 118, when the portable wireless device 100 is used by being attached to the in-vehicle unit main body 200 and independently used, the same received electric field intensity is used, There was a problem that different display values were obtained.

Therefore, when the portable wireless device 100 is attached to the in-vehicle unit main body 200 as in the present embodiment, the signal related to the received electric field strength is corrected, and the signal related to the corrected received electric field strength is corrected. Display of received electric field strength based on display 118
In this case, the display section 118 can always display an accurate received electric field strength.

Note that the above correction may be performed on a signal related to the received electric field strength in one of the paths or both paths.

Further, a means for detecting the temperature is provided, and the signal related to the received electric field strength is corrected according to the temperature, and the display of the received electric field strength is performed on the display unit 118 based on the signal related to the corrected received electric field strength. You may be comprised so that it may be made. In this case, even if the component characteristics of each unit fluctuate due to a temperature change, the display unit 118 can always display the accurate received electric field strength.

Furthermore, depending on the used channel, that is, the used frequency,
A correction may be made to the signal related to the received electric field strength, and the display unit 118 may be configured to display the received electric field strength based on the corrected signal related to the received electric field strength. In this case, even if the intensity of the received signal fluctuates due to the characteristics of the filter or the like, the display section 118 can always display the accurate received electric field intensity.

[Effects of the Invention] As described above, according to the present invention, the received electric field strength is corrected according to the usage mode of the wireless communication device, and the display is performed based on the corrected received electric field strength. Of the received electric field strength is displayed.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a radio telephone apparatus according to one embodiment of the present invention, FIG. 2 is a block diagram for explaining details of the portable radio set of FIG. 1, and FIG. 3 is a block diagram of FIG. FIG. 4 is a block diagram for explaining the details of the demodulator, and FIG. 4 is a diagram for explaining the operation of the present embodiment. 100: portable radio, 101, 201: antenna, 102: changeover switch, 103: radio unit, 130: voltage detection circuit, 13
1 Demodulator, 131i Diode, 131j A / D converter, 134 Transmitter / receiver, 161 CPU, 167 Audio unit, 200 Body unit, 205 Connection unit .

Claims (9)

(57) [Claims] A wireless communication system for receiving a radio signal arriving via a radio line, measuring a received electric field strength of the received signal, and notifying a user of information on the measured received electric field strength. In the device, a storage means for storing correction data of the received electric field strength according to the use mode of the wireless communication apparatus is provided, and when notifying the user of the information on the received electric field strength, the correction stored in the storage means is provided. A wireless communication device that corrects a received electric field strength based on data and notifies the user. 2. The wireless communication device according to claim 1, wherein the storage means stores correction data corresponding to a transmission path of a received signal in the wireless communication device. 3. The wireless communication device according to claim 1, wherein the storage unit stores correction data corresponding to an ambient temperature of the wireless communication device. 4. The wireless communication apparatus according to claim 1, wherein the storage means stores correction data corresponding to a wireless line used. 5. A receiving unit having a plurality of receiving systems, switching means for setting a signal received by one of the plurality of receiving systems to a received signal, Holding means for holding correction data for at least one, and correction means for performing correction on the received signal based on the correction data when a signal is received by a receiving system in which the correction data exists. A wireless communication device comprising: 6. The receiving section comprises first and second receiving systems, wherein the first receiving system is formed when the portable radio telephone is used alone, and wherein the second receiving system is provided with the portable radio telephone. The wireless communication device according to claim 5, wherein the wireless communication device is formed when the adapter unit is connected to the wireless telephone and used. 7. A switch for uniformly forming one of the first and second receiving systems in response to a connection state between the portable radio telephone and the adapter unit. The wireless communication device according to claim 6, further comprising means. 8. The wireless communication apparatus according to claim 5, wherein said holding means holds correction data for correcting the electric field strength of a signal received by at least one of said plurality of receiving systems. 9. An in-vehicle unit main body attached to an automobile, and a portable radio device attached to the in-vehicle unit main body to perform the function of a radio telephone and to be detached to perform the function of an independent radio telephone. In the wireless communication device, an attachment determining unit that determines whether the portable wireless device is attached to the in-vehicle unit body, and when the attachment determining unit determines that the portable wireless device is attached to the in-vehicle unit body. A first detecting means for detecting a received electric field intensity from a reception signal received from the in-vehicle unit main body, and a portable radio when the attachment determining means determines that the portable wireless device is not attached to the in-vehicle unit body. Second detection means for detecting a reception electric field strength from a reception signal received from the device side; and reception electric field strength detected by the first detection means and detected by the second detection means. And the received electric field strength
When the received signals have the same received electric field strength, storage means for storing predetermined data for obtaining the same value, based on the predetermined data stored by the storage means,
Correcting means for correcting the received electric field strength detected by the first detecting means and / or the received electric field strength detected by the second detecting means; and displaying the received electric field strength corrected by the correcting means. A wireless communication device comprising: a display unit.