JP3034319B2 - Mobile radio communication device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio communication apparatus such as an automobile telephone apparatus, a portable telephone apparatus and a cordless telephone apparatus, and more particularly to a reception signal or a transmission signal using a local oscillation frequency generated from a local oscillation circuit. The present invention relates to a wireless communication device that performs frequency conversion of a signal.

[0002]

2. Description of the Related Art A radio telephone apparatus generally generates a local oscillation frequency corresponding to a radio channel from a frequency synthesizer. The local oscillation frequency is converted into an intermediate frequency signal by mixing the local oscillation frequency with the received high frequency signal in the receiving circuit, and the intermediate frequency signal is amplified and then detected to reproduce the received baseband signal. Further, the transmission circuit modulates a transmission carrier signal with a transmission baseband signal, and converts the modulated transmission carrier with a local oscillation frequency generated by the frequency synthesizer to a radio channel frequency and transmits the converted signal from an antenna. It is configured as follows.

[0003] The deviation of the reception local oscillation frequency and the deviation of the transmission radio channel frequency of this type of device are determined by the frequency deviation of a reference oscillator provided for providing a reference signal to the frequency synthesizer. For this reason, a temperature-compensated crystal oscillator (TCXO) is generally used as the reference oscillator. However, even if this TCXO is used, it is not possible to compensate for a frequency shift caused by a change over time of the quartz oscillator. For this reason, after several years, the reception sensitivity of the mobile station device and the sound quality of the demodulated voice deteriorate, and the reception performance of the base station deteriorates due to the shift of the transmission frequency. When the deviation of the oscillation frequency further increases, not only does the reception sensitivity and sound quality deteriorate,
The control data cannot be received correctly, so that connection control with the base station cannot be performed, and interference with other adjacent radio channels is caused, which is very undesirable. Interference with other channels is a particularly serious problem in recent wireless telephone systems in which channel separation is being narrowed.

Therefore, conventionally, for example, when several years have passed after the start of use of a mobile station device, the device is brought into a service station, for example, and disassembled at the service station to adjust the oscillation frequency of a reference oscillator. The capacity of the trimmer capacitor was adjusted.

[0005]

However, since the components of a recent wireless telephone device are densely mounted in a complicated manner with the miniaturization, it is difficult to open the housing and adjust the internal components with high precision. It required skill and operation was very troublesome.

A digital TCX is used as a reference oscillator.
It has been considered to use O to reduce the time-dependent change of the frequency shift, or to use a crystal resonator which has been sufficiently aged to reduce the time-dependent change of the crystal. However, in these methods, the reference oscillator is extremely expensive. There was a disadvantage of becoming.

Therefore, the present invention focuses on the above circumstances, and
Simple operation without opening and just inputting measured values
Frequency adjustment can be performed quickly and accurately.
No need to install expensive parts and measuring instruments in the device
It is an object of the present invention to provide an inexpensive mobile radio communication device.

[0008]

In order to achieve the above object, the present invention provides a reference frequency generated by a voltage controlled oscillator.
Generate local oscillation frequency corresponding to wireless channel based on
Generated from the local oscillator circuit and the above voltage controlled oscillator
To store control voltage information corresponding to the reference frequency
Test mode in standby mode
Operation and password pattern input operation,
A predetermined pattern in which the input password pattern is set in advance
And if both patterns match, the local
To set the test mode for testing the vibration frequency
And the local oscillation frequency or voltage control.
To output the reference frequency generated by the control oscillator to outside the device
Output terminal and the frequency output terminal
Frequency obtained by measuring the frequency
Input means for the coordinator to manually input the measured values;
Test mode is set by test mode setting means
In this state, the measured values manually input by the input
New control voltage information is calculated and stored in the storage means.
Corrected control voltage information to this new control voltage information
And a correction control means for performing the correction .

[0009]

As a result, according to the present invention, even if the oscillating frequency of the reference oscillator changes due to aging, the coordinator performs the test with the apparatus set to the test mode by the mode setting means.
The value of the transmission frequency is detected using an external measuring instrument such as a
Input of the measured value of the existing dial keypad etc.
Control voltage information in the storage means by inputting from the means
Has been revised to new control voltage information taking into account the aging.
It is. For this reason, the coordinator disassembles the device and replaces parts.
Is very easy without the need for skill
The frequency can be corrected in a short time. Ma
In addition, expensive digital TCXO and crystal with little aging
Eliminates the need for transducers and measures frequency
It is not necessary to incorporate a measuring instrument into the
Maintains compact size, light weight, low power consumption and increases costs
Can be minimized. This effect works on mobile phones
Small and light weight and low power such as devices and cordless telephones
Power consumption is the most important issue for mobile wireless communication devices.
Is extremely important. In the present invention, the test
When setting the mode, match the password pattern.
Test mode by accident or intentionally
Test mode is actually set even if the
Don't worry.

[0010]

FIG. 1 is a circuit block diagram showing a configuration of a wireless communication apparatus according to an embodiment of the present invention. This device is
It comprises a receiving circuit system, a transmitting circuit system, a control circuit system, and a power supply circuit system.

First, in a receiving circuit system, a radio signal transmitted from a base station (not shown) is received by an antenna 1 and then received by a receiving circuit (R) via an antenna duplexer (DUP) 2.
X) to 3). The receiving circuit 3 converts the received radio signal into a frequency synthesizer (SY)
N) mixing with the first receiving local oscillation frequency generated from 11 to convert it into a first intermediate frequency signal, and then converting the second receiving local oscillation frequency generated from the local oscillator provided in the receiving circuit 3 to The signal is mixed and converted into a second intermediate frequency signal. The second intermediate frequency signal is amplified and detected to obtain a demodulated baseband signal. The demodulated baseband signal includes reception control data used for wireless channel connection control and the like and a reception voice signal. Of these, the reception control data is supplied to a control circuit 14 described later.
On the other hand, the received voice signal is received by a receiving audio circuit (RX-AU).
D) 4 The receiving audio circuit 4 performs de-emphasis and decompression processing on the received voice signal, performs band-limited amplification, and supplies the amplified signal to a speaker 5 for loudspeaker output.

On the other hand, in the transmission circuit system, the microphone 6
The transmission voice signal of the speaker converted into the electric signal by the above is introduced into the transmission audio circuit (TX-AUD) 7. The transmission audio circuit 7 performs pre-emphasis and compression processing on the transmission voice signal, performs band-limited amplification, and supplies the signal to a transmission circuit (TX) 8. The transmission circuit 8 has a modulator, which modulates a high frequency by the transmission signal output from the transmission audio circuit 7 and the transmission control data output from the control circuit 14. Then, the modulated high frequency signal is transmitted to the frequency synthesizer 11.
Is converted into a transmission frequency by mixing with the transmission local oscillation frequency generated from the above, and this transmission frequency signal is transmitted from the antenna 1 to the base station via the antenna duplexer 2.

The control circuit system includes a local oscillation circuit 10
, A control circuit (CONT) 14, a key input unit 15 including a dial key and a transmission switch, a display unit 16 composed of, for example, a liquid crystal display, and a storage circuit 17 composed of, for example, an EEPROM. A terminal 18 and a local oscillation output terminal 19 for outputting a transmission local oscillation signal to the outside of the device are provided.

The local oscillator circuit 10 includes a frequency synthesizer 11, a reference oscillator 12 for providing a reference signal to the frequency synthesizer 11, and a digital / analog converter (D / A) for providing a control voltage to the reference oscillator 12. / A) 13. Of these, the reference oscillator 12 is a voltage-controlled crystal oscillator (V
CTCXO). The storage circuit 17 stores in advance an individual number code (ID code) of the device itself used for wireless connection with a base station, a telephone number for short-shelf dialing, and control voltage data corresponding to a wireless channel. Has been written.

The control circuit 14 includes, for example, a microcomputer as a main control unit.
Normal processing such as processing of reception control data, generation of transmission control data, control of an audio path in the reception audio circuit 4 and the transmission audio circuit 7, input processing of information from the key input unit 15, display control of information on the display unit 16, and the like. In addition to the various functions described above, a local oscillation frequency correction control means 14a is provided. The correction control means 14a enters the test mode when the test mode designation terminal 18 is, for example, grounded and a predetermined test command is input by the key input unit 15, and the correction data input from the key input unit 15 in this state. In order to rewrite the control voltage data stored in the storage circuit 17 in accordance with.

The power supply circuit system includes a rechargeable battery 21 made of, for example, a nickel-cadmium battery, and supplies the output voltage Vcc of the battery 21 to each circuit system of the above-described device. 22 is a charging terminal, 23
Denotes a backflow prevention diode, and 24 denotes a charging resistance.

Next, the operation of the above-configured apparatus will be described according to the control procedure of the control circuit 14. When a power switch (not shown) is turned on, the control circuit 14
As shown in (1), first, the self-initialization is performed in step 2a, and a predetermined initial setting is performed for each circuit. For example, control voltage data is read from the storage circuit 17, and the oscillation frequency of the reference oscillator 12 is set according to the control voltage data. When the initialization is completed, the control circuit 14
Enters a standby state, and repeats call monitoring, incoming call monitoring, and monitoring of the test mode designation terminal 18 in steps 2b, 2c, and 2d, respectively. When the transmission switch is operated in this state, the process shifts to the call control. On the other hand, when the control data in which the call information is inserted arrives from the base station, the process shifts to the call control.

When the local oscillation frequency is adjusted, the following procedure is performed. That is, for example, the coordinator of the service station first supplies the local oscillation output terminal 19 with a tester 30 used to measure the transmission local oscillation frequency.
Connect. Then, the test mode designating terminal 18 is connected to a ground terminal (not shown), and a password pattern is input using the key input unit 15 in a predetermined input pattern.

In the standby state, the test mode designation terminal 1
When 8 is grounded, the control circuit 14 detects this state in step 2d and starts test control. That is, FIG.
As shown in (1), first, input monitoring of a password pattern is performed in step 3a. In this state, when a password pattern is input by the key input unit 15, the control circuit 14 checks the input pattern of the password pattern with a predetermined pattern in step 3b. If the patterns match, it is determined that the password pattern has been correctly input, and the test mode is set. On the other hand, if the password pattern is not correctly input, the system returns to the standby state. Here, as the password pattern, for example, a complicated input pattern in which the keys "2", "5", "8", and "0" are simultaneously pressed for a certain time or more is used. Therefore, even if a person other than the coordinator accidentally or intentionally grounds the test mode designation terminal 18, there is almost no problem that the test mode is actually set.

When the test mode is set, the control circuit 14 monitors the input of a test command in step 3c. In this state, when the coordinator turns on the transmission switch as a test command, the control circuit 14 proceeds to step 3d.
Sets the local oscillation circuit 10 and the transmission circuit 8 to the transmission operation state. Then, the reference oscillation frequency corresponding to the control voltage data currently stored in the storage circuit 17 is output from the reference oscillator 12, whereby the frequency synthesizer 11 generates the transmission local oscillation generated based on the reference oscillation frequency. The frequency is output. Therefore, the adjuster reads the value of the transmission local oscillation frequency with the tester 30 and determines whether or not this frequency deviates from the prescribed transmission local oscillation frequency. The correction data is input by operating the key input unit 15. For example, if the transmission local oscillation frequency generated by the frequency synthesizer 11 is shifted by -5.0 ppm from the specified frequency, "5" and "0" are input after the star key * is pressed by the key input unit 15. I do. Then, the control circuit 14 fetches the correction data in step 3e, and performs an operation based on the correction data in step 3f to calculate new control voltage data. Then, the control voltage data currently stored in the storage circuit 17 is rewritten with the calculated new control voltage data.

When the rewriting of the control voltage data is completed, the control circuit 14 proceeds to steps 3g and 3h.
Thus, the monitoring of whether the correction data has been input again and the monitoring of whether or not the test mode designation terminal 18 has been opened are repeatedly performed. Then, the transmission local oscillation frequency generated based on the new control voltage data is still deviated from the specified frequency, and when the adjuster inputs correction data again to correct this deviation, the control circuit 14 proceeds to step 3f. And the process for rewriting the control voltage data is executed again. Thereafter, the control circuit 14
The above control is repeatedly executed each time the correction data is input. On the other hand, when the transmission local oscillation frequency is corrected within a predetermined deviation from the specified frequency and the adjuster releases the ground state of the test mode designation terminal 18, the control circuit 14 detects this in step 3h and 8 is returned to the non-operation state, and then returns to the standby state.

As described above, according to the present embodiment, even if the oscillation frequency of the reference oscillator 12 deviates from the specified value due to aging, the tester 30 only requires the tester 30 to disassemble the apparatus and replace circuit parts. The oscillating frequency of the reference oscillator 12 can be corrected very simply and quickly without performing a complicated operation. For this reason, the handling of the device can be further simplified. In addition, since it is not necessary to use a special vibrator whose temperature changes with time, it is possible to use inexpensive components, thereby preventing an increase in the cost of the apparatus.

The present invention is not limited to the above embodiment. For example, in the above embodiment, the correction data is input from the key input unit 15 and the control circuit 14 calculates the new control voltage data based on the correction data, but the transmission local oscillation frequency displayed on the tester 30 is used. May be directly input from the key input unit 15, and the control circuit 14 may calculate new control voltage data based on the frequency value. In this way, the coordinator can perform the adjustment without knowing the value of the specified frequency, and there is no fear that the coordinator's calculation error or the like occurs, so that a simpler and more accurate correction can be performed. it can.

In the above embodiment, the coordinator uses the key input unit 15 to input correction data. However, a data input terminal for inputting measurement data of the tester 30 is provided, and the control circuit is connected to the tester 30. And the control voltage data may be modified based on the value. This eliminates the need for the adjuster to input any correction data or the like, so that the correction work can be further simplified.

Further, in preparation for a case where the deviation of the transmission local oscillation frequency from the specified frequency is large, a coarse adjustment step and a fine adjustment step are provided in the correction control procedure of the control circuit. May be performed.
In this manner, accurate correction can be performed in a short time even when the frequency shift is large.

In the above embodiment, the transmission local oscillation frequency generated from the frequency synthesizer 11 is measured. However, the oscillation frequency of the reference oscillator 12 may be measured. 8 or the transmission frequency output from the antenna 1 may be measured.

Also, in the above-described embodiment, an example has been described in which the apparatus is brought into a service station or the like having a tester to perform adjustment, but the adjustment is performed by exchanging data between the wireless telephone apparatus and the base station. May be performed. For example, a wireless communication line is set between the wireless telephone device to be adjusted and the base station, and in this state, the base station receives a transmission signal transmitted from the wireless telephone device and measures the frequency. I do. Then, the base station transmits the measured value or correction data representing the deviation of the measured value from the specified value as control data to the wireless telephone device. The wireless telephone device generates new control voltage data based on the correction data sent from the base station and rewrites data in the storage circuit. In this way, the owner of the wireless telephone device can easily perform the adjustment without requesting the adjustment to the service station. When performing the above adjustment, it is better to bring the wireless telephone device to a position sufficiently close to the base station in order to increase the measurement accuracy of the frequency and perform the correction with high accuracy. Further, the correction data sent from the base station is displayed on the display of the wireless telephone device, and the owner inputs the displayed data from the key input unit to correct the control voltage data of the storage circuit. You may. Further, the modification performed using the base station as described above may be performed only during the night when the communication traffic is relatively low.

In addition, the control procedure and control contents of the correction control means, the configurations of the test mode setting means and the correction information input means, and the like can be variously modified without departing from the gist of the present invention.

[0029]

As described in detail above, in the present invention, the local
Test mode setting to set the oscillation frequency test mode
Means to specify the test mode in standby mode.
Enter the password and password
A predetermined pattern in which the input password pattern is set in advance.
The local oscillation frequency when both patterns match.
Set the number test mode. Also, the local oscillation frequency or
Outputs the reference frequency generated by the voltage controlled oscillator to the outside of the device
A frequency output terminal and a measurement value input means,
The frequency output from the frequency output terminal is
And manually input the measured value with the above input means
And make corrections based on the input measurement values.
The control means calculates new control voltage information and stores it in the storage means.
Corrected control voltage information to this new control voltage information
I am trying to do it. Therefore, according to the present invention, the device
Simple operation without opening and just inputting measured values
Frequency adjustment can be performed quickly and accurately.
No need to install expensive parts and measuring instruments in the device
An inexpensive mobile radio communication device can be provided.

[Brief description of the drawings]

FIG. 1 is a circuit block diagram illustrating a configuration of a wireless communication device according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a control procedure and control contents in a control circuit of the device shown in FIG. 1;

FIG. 3 is a flowchart showing a control procedure and control contents in a control circuit of the device shown in FIG. 1;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Antenna, 2 ... Antenna duplexer (DUP), 3 ... Receiving circuit (RX), 4 ... Receiving audio circuit (RX-AU)
D), 5 speaker, 6 microphone, 7 transmission audio circuit (TX-AUD), 8 transmission circuit (TX),
10 local oscillator circuit 11 frequency synthesizer (SY
N), 12: Reference oscillator (VCTCXO), 13: Digital / analog converter (D / A), 14: Control circuit (CONT), 14a: Correction control means, 15: Key input unit, 16: Display (LCD) ), 17 ... storage circuit (EEP)
ROM), 18: test mode designation terminal, 19: local oscillation output terminal, 20: power supply circuit, 21: battery, 22 ...
Charging terminal, 23: diode for preventing backflow, 24: charging resistance, 30: tester.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04B 17/00 H04B 1/40

Claims (1)

(57) [Claims] 1. A mobile radio communication device having a frequency conversion circuit for converting a communication signal into a frequency for transmitting or receiving using a local oscillation frequency generated from a local oscillation circuit, wherein the voltage controlled oscillator is used as a reference oscillator. A local oscillation circuit for generating a local oscillation frequency corresponding to a radio channel based on a reference frequency generated from the voltage controlled oscillator, and control voltage information corresponding to the reference frequency generated from the voltage controlled oscillator Storage means for storing the test mode, a test mode designation operation and a password pattern in a standby state.
When the password input operation is performed,
The turn is checked against a predetermined pattern that has been set in advance.
Test the local oscillation frequency when the pattern matches
Test mode setting procedure to set the test mode
Stage and a reference generated by said local oscillation frequency or voltage controlled oscillator.
A frequency output terminal for outputting the frequency to the outside of the device, and a frequency output from this frequency output terminal
The adjuster manually obtains the measurement value obtained by measuring
An input unit for inputting, and a measurement value manually input by the input unit in a state where the test mode is set by the test mode setting unit.
And calculates new control voltage information based on
A mobile radio communication device comprising: a correction control unit for correcting stored control voltage information to new control voltage information .