JPH0799681A - Wireless receiver - Google Patents

Abstract

(57) [Summary] [Object] An object of the present invention is to provide a multi-frequency compatible radio receiver that can be used in reception frequency bands in all regions. [Configuration] The CPU 23 controls the blinking display of the LED 5, the ringing operation of the speaker 24, and the vibration operation of the vibrator 25 by a calling signal input from the wireless circuit 22 to notify that the calling signal has been received, and The display unit 6 displays the received message received together with it, identifies the channel frequency set in the connected local unit 3, and receives the identified channel frequency so that the antenna circuit 21 and the wireless circuit 2 are received.
A control signal for controlling the capacitance of the variable capacitance diode D in 2 is output to the antenna circuit 21 and the radio circuit 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio receiver, and more particularly to a multi-frequency compatible radio receiver for receiving radio signals having a plurality of reception frequencies.

[0002]

2. Description of the Related Art In a conventional radio receiver such as a pager,
Some control the reception frequency of a radio signal received by a PLL (Phase Locked Loop) circuit.
ltageControlled Oscillator (voltage controlled oscillator) has a multi-frequency compatible function that receives radio signals of multiple reception channel frequencies by varying the reception channel frequency.

The variable width of the reception channel frequency covered by this VCO is limited within the frequency band of a certain area where the radio receiver is used.

FIG. 8 shows an example of an antenna tuning circuit mounted on a conventional radio receiver. The antenna tuning circuit 81 is configured so that the trimmer capacitor CT1 can be adjusted so that the line frequency (for one channel) can be tuned and matched.
1 is tuned to a specific line frequency.

[0005]

However, in such a multi-frequency compatible radio receiver using the VCO in the conventional PLL circuit, the variable width of the reception channel frequency covered by the VCO is one. Since it was limited to the reception frequency band of the usage area, it cannot be used in the usage area where the reception frequency band is different, and there is a problem that a radio receiver with the reception frequency band set for that area must be prepared separately. there were.

In the conventional antenna tuning circuit 81, the trimmer capacitor CT1 is adjusted to tune to a specific line frequency, but the synthesizer pager has a fixed capacitance because of the structure of the trimmer capacitor CT1. When used for such multi-line frequencies (multi-channel), there is a problem that antenna tuning / matching cannot be performed for the multi-line frequencies.

It is an object of the present invention to provide a multi-frequency compatible radio receiver that can be used in the reception frequency band of every region.

[0008]

The invention according to claim 1 is
The wireless receiver main body is provided with a unit part that is detachable from the wireless receiver main body and has at least frequency information storage means for storing information corresponding to the frequency. The wireless receiver main body reads the frequency information stored in the unit part and reads the frequency information. It is characterized by having control means for automatically adjusting a circuit constant relating to reception so as to match the frequency.

According to a second aspect of the present invention, the wireless receiver main body is detachably mountable to the wireless receiver main body, and further comprises a unit section having frequency information storage means for storing at least information corresponding to a frequency. It is characterized by including a variable capacitance diode for changing a circuit constant, and having a control means for adjusting the capacitance of the variable capacitance diode by reading information corresponding to the frequency stored in the unit section.

According to a third aspect of the present invention, a variable capacitance diode for changing the resonance frequency of the antenna section, setting means for setting the reception frequency, and an optimum value for receiving the reception frequency set by the setting means. And a control means for adjusting the capacitance of the variable capacitance diode.

[0011]

According to the invention described in claim 1, the radio receiver comprises:
The wireless receiver main body is provided with a unit part that is detachable from the wireless receiver main body and has at least frequency information storage means for storing information corresponding to the frequency. The wireless receiver main body reads the frequency information stored in the unit part and reads the frequency information. It has a control means for automatically adjusting a circuit constant related to reception so as to match the frequency.

According to the second aspect of the present invention, the radio receiver is provided with a unit portion that is attachable to and detachable from the radio receiver main body and has at least frequency information storage means for storing information corresponding to a frequency. The wireless receiver body includes a variable capacitance diode that changes a circuit constant related to reception,
It has a control means for adjusting the capacitance of the variable capacitance diode by reading the information corresponding to the frequency stored in the unit section.

Therefore, it is possible to realize a radio receiver that automatically corresponds to the reception frequency band of every region by replacing the unit without changing the radio receiver main body, and the multi-frequency compatible radio reception can be realized. The availability of the machine can be improved.

According to the third aspect of the invention, a variable capacitance diode for changing the resonance frequency of the antenna section and setting means for setting the reception frequency are provided, and the reception frequency set by the setting means by the control means. The capacitance of the variable capacitance diode is adjusted to an optimum value for receiving the.

Therefore, it is possible to configure an antenna tuning circuit that tunes to multiple line frequencies by setting numerical data, and to provide a radio receiver that automatically responds to the receiving frequency bands of all regions.

[0016]

EXAMPLES Examples will be described below with reference to FIGS.

1 to 4 are diagrams showing an embodiment of a pager to which the wireless receiver of the present invention is applied.

First, the structure will be described. 1 and 2 are external views of the pager 1. The pager 1 is configured such that a main body 2 and a local unit 3 are separated as shown in FIG.

In FIGS. 1 and 2, the main body 1 is composed of a battery box 4 for accommodating batteries, an LED 5 for visually notifying a call by blinking display, an LCD panel and the like for displaying a reception message and the like. And a contact pin 8 to which a pin socket 9 provided in the local unit 3 is connected, and the display unit 6 is formed on the local unit 3. A groove 10 is formed in which the groove 11 is slid and fitted.

Further, in FIG. 2, the local unit 3
A pin socket 9 for connecting to a contact pin 8 provided on the main body 1 is provided on the, and a groove 11 for slidingly fitting into the groove 10 of the main body 1 is formed on the.

FIG. 3 is a block diagram of the pager 1 shown in FIGS. 1 and 2.

In FIG. 3, the main body 2 includes an antenna circuit 21, a radio circuit 22, a CPU 23, a speaker 24,
It is composed of a vibrator 25, an LED 5 and a display 6.

The antenna circuit 21, as shown in FIG.
Antenna 31 for receiving a radio signal and variable capacitance diodes D1, CP for variably controlling the resonance frequency of antenna 31
Resistor R1 that limits the amount of current of the output signal output to U23
And a bypass capacitor C, which receives a call signal wirelessly transmitted from a pager service company (not shown) or the like and outputs it to the wireless circuit 22.

In the antenna circuit 21, the CPU 23
The capacitance of the variable capacitance diode D is controlled by the voltage control signal input from the antenna, and the resonance frequency of the antenna 31 is variably controlled.

As shown in FIG. 4, the radio circuit 22 includes an amplifier 41 that amplifies the ringing signal input from the antenna circuit 21 at a predetermined amplification factor, and a resistor R2 that limits the amount of current of the output signal output to the CPU 23. And the coupling capacitor Ca,
Cb, Cc, a coil L, and a variable capacitance diode D2. A resonance circuit 42 that sets a resonance frequency by a capacitance change of the variable capacitance diode D2 and a ringing signal input from the resonance circuit 42 are converted into a predetermined data form. CP
It is composed of a direct conversion IC 43 which outputs to the U23, and intermittently receives the calling signal input from the antenna circuit 21, amplifies and converts the received message received together with the calling signal, and outputs the amplified message to the CPU 23.

In the radio circuit 22, the variable capacitance diode D2 is supplied by the voltage control signal input from the CPU 23.
Is controlled, and the resonance frequency of the resonance circuit 42 in the wireless circuit 22 is variably controlled.

CPU (Central Processing Unit) 23
Controls each part in the pager 1 according to a control program stored in a ROM (Read Only Memory), and performs an intermittent reception process of a call signal based on address information (call number, frame information) set in the local unit 3. To execute. That is, the CPU 23 controls the blinking display of the LED 5, the ringing operation of the speaker 24, and the vibration operation of the vibrator 25 by the call signal input from the wireless circuit 22 to notify that the call signal is received, and together with the call signal. The received message received is displayed on the display 6.

The CPU 23 also identifies the channel frequency set in the connected local unit 3,
A voltage control signal that controls the capacitance of the variable capacitance diode D in the antenna circuit 21 and the radio circuit 22 so as to receive the identified channel frequency is output to the antenna circuit 21 and the radio circuit 22.

Further, the antenna circuit 21 and the radio circuit 22 are electrostatically coupled by a coupling capacitor C1, and the radio circuit 22 and the local unit 3 are electrostatically coupled by a coupling capacitor C2.

The local unit 3 is, as shown in FIG. 4, a crystal oscillator 5 for outputting a reference oscillation signal to an oscillator 52.
1, an oscillator 52 that generates an oscillation signal of a set frequency based on a reference oscillation signal input from a crystal oscillator 51 and outputs the oscillation signal to the wireless circuit 22, address information and channel frequency information, and stores the CPU 23 in the main body 2. When the pin socket 9 shown in FIG. 2 is connected to the contact pin 8 of the main body 2, the stored information and settings are stored in the main body 2 via this connection. Outputs frequency oscillation signal information.

Next, the operation of this embodiment will be described.

The frequency band of the reception channel frequency of the pager 1 set by the local unit 3 of this embodiment is, for example, 150 MHz band, 280 MHz band, 450 MHz band.
There is no limitation on the MHz band, 900 MHz band, etc., and those corresponding to all pager reception channels in all reception frequency bands are prepared.

Now, for example, a case will be described in which the local unit 3 in which the reception channel frequency of the 280 MHz band, which is the reception frequency band allocated for the Japanese pager, is set, is attached to the main body 2.

In the local unit 3, the groove 11 formed in the case and the groove 10 formed in the case of the main body 2 are fitted by sliding, and the pin socket 9 provided in the local unit 3 is provided in the main body 2. Contact pin 8
After the connection, the hook 7 provided on the main body 2 is fixed.

The CPU 23 in the main body 2 obtains electrical continuity between the contact pin 8 and the local unit 3 connected by the pin socket 9 to input from the frequency information storage unit 53 in the local unit 3. Information on the reception channel frequency is identified, a voltage control signal for controlling the resonance frequency is output to the antenna circuit 21 and the radio circuit 22, and the capacitance of each variable capacitance diode D is automatically controlled so as to match the 280 MHz band.

By controlling the capacitance of the variable capacitance diode D, the pager 1 is matched with the 280 MHz band which is the reception frequency band assigned to the Japanese pager,
Intermittent reception of a ringing signal can be performed at the reception channel frequency of the 280 MHz band.

When the pager 1 is used in the United States, the local unit 3 in which the receiving channel frequency of 900 MHz band which is the receiving frequency band allocated for the American pager is set is attached to the main body 2. Thus, similarly to the above, the CPU 23 in the main body 2 identifies the information of the set reception channel frequency, outputs a voltage control signal for controlling the resonance frequency to the antenna circuit 21 and the radio circuit 22, and outputs the 900 MHz band. The capacitance of each variable capacitance diode D is automatically controlled so that

Therefore, in the pager 1, it is possible to automatically correspond to the reception frequency band and its reception channel frequency in every region only by exchanging the local unit 3. As a result, it is possible to improve the support capability of the multi-frequency compatible radio receiver such as a multi-channel compatible pager in the usage area, and the receiver unit can be commonly used in all areas, and the hardware cost is low. Can be easily realized.

In this embodiment, the case where the present invention is applied to the pager 1 has been described, but the present invention is not limited to this.
For example, address information may not be set in the local unit 3 for broadcast reception, or information for descrambled may be set in the local unit 3 so that it cannot be received unless a contract is made.

Further, in this embodiment, the frequency information storage unit 5
Although the matching is performed based on the channel frequency information set in 3, the oscillator 5 in the local unit 3
You may make it match based on the oscillation signal of 2.

Next, another embodiment of the pager to which the radio receiver of the present invention is applied will be described with reference to FIGS.

FIG. 5 shows a circuit configuration of a pager in another embodiment.

In FIG. 5, the receiving section 66 is a circuit section for demodulating the FM signal received by the antenna 65.

The ID-ROM 68 is an EEPROM, and is a circuit section for sending the stored address information to the decoder section 67 under the control of the decoder section 67.

The receiving section 66 is driven intermittently based on the frame information in the address information fetched by the decoder section 67, and the received signal demodulated by the receiving section 66 is decoded, and it matches the calling number in the address information. At this time, the circuit unit sends a coincidence detection signal to the CPU 63.

The key input unit 69 is provided with various switches, and is a circuit unit which sends a corresponding key input signal to the CPU 63 when any one of them is operated.

The CPU 63 is a circuit for controlling each circuit section according to a built-in micro program.

The ROM 62 stores in advance a plurality of sets of data, each set including a set reception frequency, a control voltage for controlling the variable capacitance diode D1, address information, and control information for changing the reception frequency of the receiver 66.

The control information for changing the reception frequency of the receiver 66 is frequency division data for changing the frequency division ratio of the PLL synthesizer in the receiver 66.

The DA converter 64 is a circuit section for converting digital data into analog signals.

Since the resistor R1, the coupling capacitor C1, the bypass capacitor C and the variable capacitance diode D1 have been described above, the description thereof will be omitted.

Next, the operation of another embodiment will be described.

When the set reception frequency is input from the key input unit 69, the CPU 63 associates this with the ROM 62.
The control voltage data, the address data, and the control data stored in are read, and the control voltage data is output to the DA converter 64, the address data is output to the ID-ROM 68, and the control data is output to the receiving unit 66.

As a result, the receiver 66 changes the reception frequency to the set reception frequency, and the ID-ROM 68 rewrites the address data.

The DA converter 64 is also configured to convert the input control voltage data into an analog signal, output it to the variable capacitance diode D1 in the antenna tuning circuit 61, and control the capacitance thereof.

That is, the calling number, the intermittent reception timing and the reception frequency of the receiving section 66 can be changed by the address data and the control data stored in the ROM 62, and the control voltage data stored in the ROM 62 can be changed. By changing the capacitance of the variable capacitance diode D1, the resonance frequency of the antenna 65 can be changed to correspond to each set reception frequency.

Therefore, the control voltage data for setting the resonance frequency corresponding to the receiving channel is stored in the ROM 62, and C is stored according to the receiving channel designated by the user.
If the PU reads the corresponding control voltage data from the ROM 62 and transfers it to the DA converter 64, DA
The converter 64 converts the voltage control signal into the antenna tuning circuit 61.
The capacitance can be set by outputting to the variable capacitance diode D1 inside, and the resonance frequency of the antenna can be controlled so as to be tuned to the designated reception channel.

As a result, if the control voltage data corresponding to a plurality of reception channels is preset in the ROM 62, a pager corresponding to a plurality of reception channels can be provided. Further, in this embodiment, since the data is generated from the ROM, there is an advantage that the antenna tuning frequency can be automatically reset when the receiving channel is switched. There is no variation in the set voltage due to factors such as the above, frequency setting can be made highly reproducible, and highly accurate antenna tuning control can be realized.

As a result, the trimmer capacitor incorporated in the conventional pager can be omitted, and the work of adjusting the trimmer capacitor can be omitted, so that the receiving performance and reliability of the pager can be improved.

The circuit configuration of the antenna tuning circuit 61 is not limited to that shown in FIG.
An antenna tuning circuit 71 having the circuit configuration shown in FIGS. 6 and 7,
72 is also applicable.

[0061]

According to the first and second aspects of the present invention, the radio receiver automatically adapts to the reception frequency band of every region only by replacing the unit without changing the radio receiver main body. Can be realized, and the availability of the multi-frequency compatible wireless receiver can be improved.

According to the third aspect of the invention, the antenna tuning circuit that tunes to multiple line frequencies can be constructed by setting the numerical data, and the radio receiver that automatically corresponds to the receiving frequency band of every region. Can be provided.

[Brief description of drawings]

FIG. 1 is an external view of a pager to which a wireless receiver of the present invention is applied.

2 is an external view of the pager of FIG. 1 when a main body and a local unit are separated.

FIG. 3 is a block diagram of the pager in FIG.

4 is a diagram showing a circuit configuration in each block of FIG.

FIG. 5 is a configuration diagram of another embodiment of a pager to which the wireless receiver of the present invention is applied.

FIG. 6 is a diagram showing a circuit configuration of another antenna tuning circuit.

FIG. 7 is a diagram showing a circuit configuration of another antenna tuning circuit.

FIG. 8 is a diagram showing a circuit configuration of a conventional antenna tuning circuit.

[Explanation of symbols]

 1 pager 2 main body 3 local unit 4 battery box 5 LED 6 indicator 7 hook 8 contact pin 9 pin socket 10, 11 groove 21 antenna circuit 22 wireless circuit 23 CPU 24 speaker 25 vibrator 31 antenna 41 amplifier 42 resonant circuit 43 direct conversion IC 51 crystal oscillator 52 oscillator 53 frequency information storage unit 61, 71, 72 antenna tuning circuit 62 ROM 63 CPU 64 DA converter 65 antenna 66 receiving unit 67 decoder unit 68 ID-ROM 69 key input unit

Claims (3)

[Claims] 1. A unit unit that is detachable from the radio receiver main body and has a frequency information storage means for storing at least information corresponding to a frequency, and the radio receiver main body has frequency information stored in the unit unit. And a control means for automatically adjusting a circuit constant relating to reception so as to match the reading frequency. 2. A unit which is detachable from the radio receiver main body and has a frequency information storage means for storing at least information corresponding to a frequency, wherein the radio receiver main body is a variable unit for changing a circuit constant related to reception. A radio receiver comprising a capacitance diode and having control means for adjusting the capacitance of the variable capacitance diode by reading information corresponding to the frequency stored in the unit section. 3. A variable-capacitance diode for changing the resonance frequency of an antenna section, setting means for setting a reception frequency, and a capacitance of the variable-capacitance diode for an optimum value for receiving the reception frequency set by the setting means. A radio receiver comprising: a control unit that adjusts.