JP2740025B2 - Wireless communication device - Google Patents

Abstract

PURPOSE:To display reception electric field strength accurately by devising the subject equipment such that a threshold level is rewritten externally even when the dispersion in performance among equipments is present thereon. CONSTITUTION:The equipment is provided with a measuring means 322 measuring the reception electric field strength, a storage means 370 storing a threshold level, a comparison means 331 deciding the stage of the measured reception electric field strength, a detection means 452 and a write means. The reception means receives a prescribed signal whose reception electric field strength is known and a threshold level stored by the storage means 370 is rewritten based on the reception electric field strength measured by the measurement means 322 from the prescribed signal. Thus, even when the reception characteristic has the dispersion among equipments, since the reference value for the display of the reception electric field strength is set so as to compensate the dispersion, the display of the reception electric field strength is accurately attained.

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. In addition, since it is meaningful for the user to know the reception electric field strength, the reception electric field strength is often displayed on a display unit such as a liquid crystal display.

By the way, when the received electric field strength is displayed on a liquid crystal display or the like, it is often performed digitally. That is, a threshold value for determining a plurality of steps set according to the reception electric field strength is stored in advance, and the step of the reception electric field strength is determined by comparing with the stored threshold value (reference value). The decision is made and the stage is displayed on a liquid crystal display or the like.

However, conventionally, the above-described threshold is
Since the data is stored in a fixed manner in a ROM or the like, there is a problem that the display of the received electric field intensity cannot be accurately performed due to the variation of the reception characteristics between the devices.

(Problems to be Solved by the Invention) As described above, the conventional display of the received electric field strength in the wireless communication device is performed by comparison with a threshold value fixedly stored in a ROM or the like, so that the performance between the devices is reduced. There is a problem that the measurement cannot be performed accurately depending on the variation of the data.

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 capable of accurately displaying a received electric field strength.

[Configuration of the Invention] (Means for Solving the Problems) The present invention measures a receiving means for receiving a radio signal arriving via a radio line, and measures a received electric field strength of the radio signal received by the receiving means. Measuring means, storing means for storing a threshold value for determining a plurality of steps set according to the received electric field strength, and comparing the threshold value stored by the storing means with the measuring means Comparing means for determining the level of the received electric field strength measured; notifying means for notifying the level of the received electric field strength determined by the comparing means; and a storage means for storing a value based on the received electric field strength measured by the measuring means. And writing means for writing the data into the.

Further, the wireless communication apparatus having the above configuration receives a predetermined signal whose reception electric field intensity is known from the reception unit, and stores the predetermined signal in the storage unit by a value based on the reception electric field intensity measured by the measurement unit in the predetermined signal. It can be manufactured by rewriting the threshold value.

Further, another invention is a receiving means for receiving a wireless signal arriving via a wireless line, a measuring means for measuring a received electric field strength of the wireless signal received by the receiving means, and Storage means for storing a threshold value for determining a plurality of steps to be set, and a comparison for determining the level of the received electric field strength measured by the storage and measurement means by comparing the threshold value stored by the storage means Means, notifying means for notifying the level of the received electric field strength determined by the comparing means, input means for inputting a threshold value stored by the storage means, and a threshold inputted by the input means. Writing means for writing a value into the storage means.

According to still another aspect of the present invention, at least one reference value indicating at which stage the received electric field strength of a received signal corresponds to the received electric field strength of a signal received via a wireless line is displayed in a stepwise manner. A reference value setting method for displaying a received electric field strength of a wireless communication device, which is determined by using: a) generating a predetermined amount of radio waves corresponding to the reference value from outside; and b) generating the generated radio waves. Receiving; c) measuring a received electric field strength of the received radio wave; and d) storing the measured received electric field strength value as data of the reference value.

(Operation) In the present invention, the threshold value can be rewritten from the outside, so that accurate display of the received electric field strength can be performed.

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

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

The mobile telephone device 100 shown in FIG. 1 includes an antenna 200, a wireless device 300, and a telephone 400.

Here, the antenna 200 is mounted outside the car,
Radio 300 is mounted in the trunk of a car. Also,
The telephone 400 includes a telephone main body 400a and a handset 400b, and is mounted near a driver's seat in an automobile.

The wireless device 300 includes a wireless unit 310 that forms a wireless line 600 with a base station (not shown) via the antenna 200 to exchange signals, an audio / control unit 330 that performs overall control of the entire device, A voice dial unit 350 for performing voice recognition and voice synthesis, etc., and an E ² PROM 37 for storing threshold values for determining a plurality of steps set according to the received electric field strength.
0. The main part is constituted by a power supply part 390 which inputs electric power of a battery mounted on the automobile and supplies it to each part of the apparatus.

Radio section 310 includes demodulator 312, modulator 314, power amplifier 3
16, a duplexer 318, a synthesizer 320, and a received electric field strength detector 322.

The demodulator 312 demodulates a signal received from the base station, which is input via the radio line 600, the antenna 200, and the duplexer 318. The reception signal includes an audible sound signal, a control signal, and the like.

The modulator 314 modulates an audible sound signal, a control signal, and the like output from the audio / control unit 330 to generate a transmission signal.

Power amplifier 316 amplifies the transmission signal output from modulator 314.

The duplexer 318 sends a received signal input via the radio line 600 and the antenna 200 to the demodulator 312, and sends a transmission signal input via the modulator 314 and the power amplifier 316 to the antenna 200. .

Synthesizer 320 is a local oscillator for channel selection, and specifies a frequency to be demodulated by demodulator 312 and a frequency to be modulated by modulator 314.

As shown in FIG. 2, the reception field strength detection unit 322 includes a mixer 322a, a band-pass filter 322b, a local oscillator 322c,
It comprises an IF detection IC 322d and an A / D converter 322e. Then, an analog voltage corresponding to the received electric field strength is output to the IF detection IC 322d via the mixer 322a and the band-pass filter 322b. The analog voltage is converted into predetermined digital data by the A / D converter 322e, and the digital data is sent to the CPU 331.

The audio / control unit 330 includes a CPU 331 and an oscillator / divider 3
32, an address decoder 333, a ROM 334, a RAM 335, a radio section control section 336, an audio section 337, a control signal processing section 338, an audio section control section 339, a digital interface 340, a power supply section control section 341 and an interrupt controller 342. .
In the figure, reference numeral 343 denotes, for example, an 8-bit data bus, 3
44 is an address bus, and 345 is a control bus.

The CPU 331 performs overall control of the audio / control unit 330 as a whole.

The oscillator / frequency divider 332 supplies a clock to the CPU 331, divides the frequency of the clock, and supplies it to each unit as a timing signal.

The address decoder 333 outputs a predetermined operation signal to each unit according to a command signal from the CPU 331.

The ROM 334 stores various programs necessary for the operation of the CPU 331.

 The RAM 335 stores various data during the processing of the CPU 331.

The wireless unit control unit 336 controls the wireless unit 3 based on an instruction from the CPU 331.
Perform 10 controls. For example, the radio unit control unit 336 instructs the frequency to be designated by the synthesizer 320, the amplification factor to be amplified by the power amplifier 316, the modulation factor to be modulated by the modulator 314, and the like.
Out of synchronization signal, an output detection signal output from the power amplifier 316, and the like are transmitted to the CPU 331.

The audio unit 337 sends a control signal of the received signal demodulated by the demodulator 312 to the control signal processing unit 338, sends an audible sound signal to the voice dial unit 350 and the telephone 400, and is output from the control signal processing unit 338. A control signal and an audible sound signal output from telephone 400 and voice dial unit 350 are transmitted to modulator 314. Note that the audio unit 337 also has a function of shaping the waveform of the control signal sent to the control signal processing unit 338 and filtering the control signal to be sent to the modulator 314.

The control signal processing unit 338 performs bit synchronization and frame synchronization with a control signal output from the audio unit 337,
The control data from the base station included in the control signal that 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 337 as a control signal that is a serial signal. .

The audio unit control unit 339 performs various controls of the audio unit 337. For example, the audio unit control unit 339 controls the switching of sending the received signal from the audio unit 337 to the control signal processing unit 338, the voice dial 350 or the telephone 400, the control signal processing unit 338, the voice dial unit 350 or the telephone 400. Switching control for taking in any of the transmission signals output from the audio unit 337.

Digital interface 340 provides an interface between wireless device 300 and telephone 400.

The power supply unit control unit 341 controls the power supply unit 390. For example, the power supply unit control unit 341 controls the power supply unit 390 to set the voltage supplied from the battery to a predetermined voltage and supply the voltage to each unit.

The interrupt controller 342 receives an interrupt command from each unit and interrupts the CPU 331.

The telephone body 400a includes amplifiers 413 and 414, a hands-free control unit 415, attenuators 415a and 415c, switches 416 and 417, a hands-free microphone 494, a speaker 492, a hook switch (not shown), and an on / off switch (not shown). The main part is comprised from.

Amplifier 413 amplifies the audio signal transmitted from audio section 337 of wireless device 300 and outputs the amplified signal from speaker 492.

Amplifier 414 amplifies the audio signal input by hands-free microphone 494 and sends it to audio section 337.

The hands-free control unit 415 controls the attenuation rate of the attenuator 415a that attenuates the audio signal input to the amplifier 413, and controls the attenuation rate of the attenuator 415c that attenuates the audio signal output from the amplifier 414.

The switch 416 switches whether or not the audio signal transmitted from the audio unit 337 is output from the speaker 492.

Switch 417 switches whether or not to transmit an audio signal from hands-free microphone 494 to audio unit 337. Note that these switches 416 and 417 are switched by a radio
This is performed based on a control signal transmitted from the audio / control unit 330 of the 300.

A hook switch (not shown) detects on-hook or off-hook of handset 400b. The detected signal is sent to the audio / control unit 330 of the wireless unit 300.

An on / off switch (not shown) switches on / off of the entire mobile phone device 100.
This switching signal is transmitted to the audio / control unit 330 of the radio unit 300.
Sent to

The handset 400b includes a control unit 418, amplifiers 419a, 419
c, switch 423, 424, liquid crystal display 452, LCD driver 45
4. A key unit 430 including a plurality of keypads, a handset microphone 496, and a handset receiver 498.

The control unit 418 controls the handset 400b based on a control signal transmitted from the audio / control unit 330 of the wireless device 300.
In addition to performing overall control of the whole, the control signal or the like input from the key unit 430 is transmitted to the audio / control unit 330 of the wireless device 300.
To send to.

Amplifier 419a amplifies the audio signal transmitted from audio section 337 and outputs the amplified signal from handset receiver 498.

The amplifier 419c amplifies the audio signal input from the handset microphone 496 and sends the amplified audio signal to the audio unit 337.

The switch 423 switches whether to output the audio signal from the audio unit 337 from the handset receiver 498.

The switch 424 switches whether to transmit an audio signal from the handset microphone 496 to the audio unit 337. The switches 423 and 424 are switched by the control unit 41.
This is performed under the control of 8.

The liquid crystal display 452 includes a number display section of several digits, a display section for each function, and the like. For example, as shown in FIG. 3, an electric field strength signal is displayed. In this example, the electric field intensity signal is displayed in four stages, and the hatched portion indicates lighting, and the greater the number of lightings, the stronger the electric field intensity signal.

The LCD driver 454 drives the liquid crystal display 452 based on the control of the control unit 418 to perform a predetermined display.

The key unit 430 includes numeric keys “0” to “9”, “*”,
"#", "SND", "STO", "END", "RCL", "FC
"N", "CLR", "EMR", "M"
It consists of keypads such as "UTE" and "TONE" function keys.
When the keypad is pressed, the control unit 418 recognizes this.

In the mobile telephone device 100 configured as described above, the threshold value for displaying the received electric field strength is set at the manufacturing stage. Hereinafter, the setting operation will be described.

First, as shown in FIG. 1, a signal oscillator 500 that oscillates a predetermined signal whose intensity (antenna input electric field level) is known is connected instead of the antenna 200. The mobile phone device 100 is set to the threshold setting mode by a predetermined operation of the key unit 430, for example, “FNC”, “#”, “0”.

Here, the lighting of the display of the electric field intensity signal on the liquid crystal display 452 is set to “1” when the antenna input electric field level exceeds AdB.

In this case, a predetermined signal whose antenna input electric field level is AdB is input from signal oscillator 500. At this time, the A / D converter 32
It is assumed that the digital value output from 2e is "10" as shown in FIG. By a predetermined operation of the key unit 430, for example, “#” or “1”, “10” is stored in the E ² PROM 370 as a threshold value for lighting “1”.

Next, when the antenna input electric field level BdB is exceeded,
It is assumed that the lighting of the display of the electric field strength signal on the liquid crystal display 452 is set to “2”.

In this case, a predetermined signal whose antenna input electric field level is BdB is input from signal oscillator 500. At this time, the A / D converter 32
It is assumed that the digital value output from 2e is "20" as shown in FIG. By a predetermined operation of the key unit 430, for example, “#” or “2”, “20” is stored in the E ² PROM 370 as a threshold value for lighting “2”.

Hereinafter, similarly, the threshold value for lighting “3” and “4” is
Stored in E ² PROM 370.

Therefore, in the present embodiment, the threshold value for displaying the received electric field strength can be accurately set in the manufacturing stage. Therefore, the display of the received electric field strength can be accurately performed without being affected by the dispersion of the performance among the apparatuses.

Next, the display operation of the received electric field strength will be described based on the flowchart shown in FIG.

The received signal arriving via the wireless line 600 is transmitted to the antenna 2
00, and transmitted to the reception electric field strength detection unit 322 via the duplexer 318.

Then, an analog voltage corresponding to the received electric field intensity is output to the IF detection IC 322d of the received electric field intensity detection unit 322, and the analog voltage is converted into predetermined digital data by the A / D converter 322e and sent to the CPU 331.

First, the CPU 331 first sets the digital data N and E ²
A comparison is made with the threshold value "10" stored in the PROM 370 (step 501). If the digital data N is smaller than the threshold value "10", the display of the electric field strength signal on the liquid crystal display 452 is set to "0". Issue a command to say, "Step 50
2).

If the digital data N is larger than the threshold "10", the digital data N is compared with the threshold "20" (step 503). A command is issued to turn on the display of the electric field strength signal at 452 to "1" (step 504).

If the digital data N is larger than the threshold value "20", the digital data N is compared with the threshold value "30" (step 505). A command is issued to set the display of the electric field strength signal at 452 to "2" (step 506).

If the digital data N is larger than the threshold "30", the digital data N is compared with the threshold "40" (step 507). A command is issued to set the display of the electric field strength signal at 452 to "3" (step 508).

If the digital data N is larger than the threshold value "40", a command is issued to set the display of the electric field strength signal on the liquid crystal display 452 to "4" (step 509).

 Note that the present invention is not limited to the above-described embodiment.

For example, threshold values were stored using E ² PROM,
It can also be performed by a battery backup type RAM.

When setting the threshold, the signal oscillator 500 is connected to the antenna 2
Direct connection instead of 00, but signal oscillator
500 signals may be input from the antenna 200 via a wireless line. In this case, the threshold value can be set for a plurality of devices at a time, and the labor for connection can be saved.

Furthermore, although the threshold value is set in the manufacturing stage, the user may set the threshold value. That is, the threshold value is input by a predetermined operation of the key unit 430. Thereby, the user can display the electric field strength signal according to his preference. Hereinafter, the operation example will be described. First, a predetermined operation of the key unit 430, for example, "F
NC ”,“ * ”,“ 0 ”sets the mobile telephone device 100 to the threshold change mode. When it is desired to change the threshold value for lighting “1” from, for example, “10” to “12”, the predetermined operation of the key unit 430 is performed by “*”, “1”, “*”.
Perform as “1” and “2”.

[Effects of the Invention] As described above, according to the present invention, even when there are variations in the reception characteristics depending on the device, the reference value for displaying the received electric field strength is set so as to compensate for the variations. Therefore, it is possible to accurately display the received electric field strength.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an automobile telephone device according to one embodiment of the present invention, FIG. 2 is a diagram showing a configuration of a reception electric field intensity detecting section shown in FIG. 1, and FIG. 3 is a diagram shown in FIG. FIG. 4 is a diagram showing an example of displaying an electric field intensity signal by a liquid crystal display, FIG. 4 is a diagram for explaining a threshold, and FIG. 5 is a flowchart for explaining a display operation of a received electric field intensity according to the present invention. is there. 322: Received electric field strength detector, 322a: Mixer, 322b:
… Bandpass filter, 322c …… Local oscillator, 322d ……
IF detection IC, 322e ...... A / D converter, 331 ...... CPU, 370 ...... E 2
PROM, 430: Key input unit, 452: Liquid crystal display, 500:
... signal oscillator, 600 ... wireless line.

Claims (5)

(57) [Claims] 1. A receiving means for receiving a radio signal arriving via a radio line, a measuring means for measuring a received electric field strength of a radio signal received by the receiving means, and a measuring means set according to the received electric field strength Storage means for storing a threshold value for determining a plurality of steps, and comparing means for determining the level of the received electric field strength measured by the measuring means by comparing the threshold value stored by the storage means. A notification unit for notifying the level of the reception electric field strength determined by the comparison unit; and a writing unit for writing a value based on the reception electric field intensity measured by the measurement unit into the storage unit. Wireless communication device. 2. The wireless communication apparatus according to claim 1, wherein said storage means has an E ² PROM as a main part. 3. The wireless communication apparatus according to claim 1, wherein a predetermined signal having a known reception electric field strength is input from said reception means, and said predetermined signal is represented by a value based on the reception electric field strength measured by said measurement means. A method for manufacturing a wireless communication device, comprising rewriting a threshold value stored by a storage unit. 4. A receiving means for receiving a radio signal arriving via a radio line, a measuring means for measuring a received electric field strength of a radio signal received by the receiving means, and a measuring means set according to the received electric field strength. Storage means for storing a threshold value for determining a plurality of steps, and comparing means for determining the level of the received electric field strength measured by the measuring means by comparing the threshold value stored by the storage means. Notification means for notifying the level of the received electric field strength determined by the comparison means; input means for inputting a threshold value to be stored by the storage means; and threshold value input by the input means And writing means for writing in the storage means. 5. A method for displaying a received electric field strength of a signal received via a wireless line in a stepwise manner by using at least one reference value to indicate a stage of the received electric field strength of a received signal. A reference value setting method for displaying a received electric field intensity of a wireless communication apparatus, the method comprising: a) generating a predetermined amount of radio waves corresponding to the reference value from outside; and b) receiving the generated radio waves. C) measuring the received electric field strength of the received radio wave; and d) storing the measured received electric field strength value as the data of the reference value. Reference value setting method for display.