KR20210000907U - Communication device - Google Patents

Abstract

A communication device is disclosed. The communication device includes: a radio for performing communication with another radio using a first frequency band; An FM radio receiver capable of listening to a disaster broadcast using a second frequency band different from the first frequency band; And a common speaker selectively outputting a signal received through the radio and the FM radio receiver, and the radio and the FM radio receiver may use a frequency modulation method using a phase-locked loop (PLL). .

Description

Communication device {COMMUNICATION DEVICE}

The present invention relates to a communication device, and more particularly, to a communication device in which a radio for two-way communication between individuals and an FM radio receiver capable of receiving an FM radio are integrally manufactured.

In a disaster situation, there is a high possibility that communication using the existing mobile communication network is impossible due to the destruction of the mobile communication base station or the congestion of data usage. At this time, in order to check the safety of family and acquaintances, two-way communication between individuals is possible regardless of the existing mobile communication network, and there is a need for a means for stably receiving disaster broadcasts in order to quickly cope with the disaster situation.

However, there is no product that can simultaneously utilize the FM radio that receives disaster broadcasts and the radio function that enables two-way communication between individuals in a disaster situation in which the existing communication networks and power grids have been destroyed. In addition, conventional assembly-type radios often employ analog superheterodyne technology, and stable communication may not be possible due to frequency crosstalk.

The present invention can provide a communication device capable of preparing for a sudden disaster situation by integrally manufacturing a walkie-talkie capable of two-way communication between individuals and an FM radio receiver capable of receiving FM radio.

In addition, the present invention provides a method for improving communication stability of a communication device by using a digital superheterodyne technology that utilizes a phase-locked loop (PLL) technology, not an analog superheterodyne technology. Can provide.

A communication device according to an embodiment of the present invention includes a radio for performing communication with another radio using a first frequency band; An FM radio receiver capable of listening to a disaster broadcast using a second frequency band different from the first frequency band; And a common speaker selectively outputting a signal received through the radio and the FM radio receiver, and the radio and the FM radio receiver may use a frequency modulation method using a phase-locked loop (PLL). .

When signals are simultaneously received through the radio and the FM radio receiver, the common speaker may exclude a signal from the FM radio receiver due to an output difference and output a signal from the radio.

The radio and FM radio receiver may be integrally generated in one case.

The present invention can prepare for a sudden disaster situation by fabricating an integrated radio receiver capable of receiving two-way communication between individuals and an FM radio.

In addition, according to the present invention, communication stability of a communication device can be improved by using a digital superheterodyne technology that utilizes a phase-locked loop (PLL) technology instead of an analog superheterodyne technology.

1 is a diagram showing a communication system according to an embodiment of the present invention.
2 is a diagram showing a communication device according to an embodiment of the present invention.
3 is a diagram showing the structure of a receiver of a radio and RF radio receiver using a PLL according to an embodiment of the present invention.
4 is a diagram showing the structure of a transmitter of a radio and RF radio receiver using a PLL according to an embodiment of the present invention.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. However, since various changes may be made to the embodiments, the scope of the patent application is not limited or limited by these embodiments. It is to be understood that all changes, equivalents, or substitutes to the embodiments are included in the scope of the rights.

The terms used in the examples are used for illustrative purposes only and should not be construed as limiting. Singular expressions include plural expressions unless the context clearly indicates otherwise. In the present specification, terms such as "comprise" or "have" are intended to designate the presence of features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, but one or more other features. It is to be understood that the presence or addition of elements or numbers, steps, actions, components, parts, or combinations thereof does not preclude in advance.

In addition, in the description with reference to the accompanying drawings, the same reference numerals are assigned to the same components regardless of the reference numerals, and redundant descriptions thereof will be omitted. In describing the embodiments, when it is determined that a detailed description of related known technologies may unnecessarily obscure the subject matter of the embodiments, the detailed description thereof will be omitted.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a diagram showing a communication system according to an embodiment of the present invention.

Referring to FIG. 1, when a disaster occurs, the communication device 110 constituting the communication system 100 uses a radio function capable of two-way communication between individuals and communicates with radios 120 and 130 existing in other regions. Communication can be performed. For example, when a disaster situation occurs and the existing mobile communication network cannot be used, the user may request a rescue through a radio function included in the communication device 110 or receive a rescue signal from another radio. That is, the communication device 110 provided by the present invention may include a radio that performs communication with other radios using a specific frequency band.

In a disaster situation, it is essential to receive a disaster broadcast in order to cope with an urgent and dangerous situation. Such a disaster broadcast may be transmitted from the base station 140 in various forms, such as TV broadcast or radio, to provide comprehensive information on a disaster situation to viewers or listeners. The dual communication device 110 can improve portability by allowing it to receive disaster broadcasts through a radio function. That is, the communication device 110 provided by the present invention may include an FM radio receiver capable of listening to a disaster broadcast using a frequency band different from a specific frequency band used by the radio.

In this way, the communication device 110 is an integrated radio receiver capable of receiving two-way communication between individuals and an FM radio receiver capable of receiving a disaster broadcast, thereby helping the user to actively cope with a sudden disaster situation. Can give

2 is a diagram showing a communication device according to an embodiment of the present invention.

Referring to FIG. 2, the communication device 110 of the present invention may include a radio 111, an FM radio receiver 112, a common speaker 113, a display 114, and a power supply 115. First, the radio 111 may include a push-to-talk (PTT) function that enables communication by pressing when speaking to the other party through button manipulation and releasing when listening. The user can communicate with one-to-one or one-to-many by transmitting and receiving a wireless signal with only a simple button operation through the PTT function of the radio 111.

The FM radio receiver 112 may provide a disaster broadcast to a user by receiving an FM radio signal broadcast through the base station 140 and outputting it through the common speaker 113.

At this time, the radio 111 and the FM radio receiver 112 may provide a method of accurately changing the frequency source to a desired frequency source or fixing the frequency source so that the frequency source does not shake by using a digital superheterodyne technology using PLL technology. .

Specifically, the source of trying to adjust the phase with the PLL may be digital clock synchronization. In digital signal transmission using a digital clock, it is necessary to clearly distinguish whether the incoming signal is 0 or 1. In order to do that, you need to define exactly what range distinguishes between what is 0 or 1. This in turn means that you need to know clearly where each clock starts and ends.

However, if a signal is sent somewhere over the wire or wirelessly, a delay of the signal occurs according to the signal path, and the phase changes. Therefore, the reception point must determine 0 and 1 as the start and end. It becomes ambiguous whether it is doing. Therefore, you may need something that accurately matches the start and end of the clock, that is, synchronizes it.

)과 끝(

)을 맞추어 준다는 것은, 신호가 어떻게 들어오든 결국 특정 위상 포인트에서 들어오는 것처럼 고정(lock)하는 것이다. 즉, 이렇게 주기적인 신호의 위상을 원하는 대로 흔들리지 않는　정확한 고정점으로 잡아 주기 위해 만들어진 회로가 바로 PLL이다. The beginning of a cycle (

) And the end (

Matching) means that whatever the signal comes in, it locks as if it comes from a certain phase point. In other words, the circuit created to hold the phase of the periodic signal to an accurate fixed point that does not shake as desired is the PLL.

Since PLL plays a decisive role in digital signal transmission and communication, it is a circuit configuration method widely used not only in the digital field but also in the analog electronic circuit system. The PLL, which is widely used in this way, not only fixes the transmit/receive frequency in radio frequency (RF) so as not to change, but also helps to accurately change the frequency source to a desired frequency.

The common speaker 113 may selectively output a radio signal or an FM radio signal based on the reception state of the radio 111 and the FM radio receiver 112. For example, when a user transmits a wireless signal to another radio or receives a radio signal from another radio using the radio 111, the common speaker 113 of the communication device 110 is transmitted and received through the radio 111. It is possible to preferentially output a radio signal.

In other words, when the radio signal and the radio signal are simultaneously received through the radio 111 and the FM radio receiver 112, the communication device 110 excludes the radio signal received through the FM radio receiver 112 by an output difference. And, the wireless signal received through the radio 111 may be output using the common speaker 113.

The display 114 may help a user to use the radio and FM radio receiver more conveniently by displaying a frequency or channel used by the radio or FM radio receiver.

The power supply device 115 may supply power to a plurality of components included in the communication device 110. For example, the power supply device 115 may use a lithium ion battery as a main power source and a solar cell capable of self-generation as an auxiliary power source, thereby enabling the communication device 110 to be used even in a power outage situation due to a disaster. In this case, the power supply 115 can secure low power by using a frequency modulation method using a PLL in the radio 111 and the FM radio receiver 112.

Meanwhile, in the communication device 110 of the present invention, a separate light is attached to secure visibility in a dark place in a disaster situation, and each of a plurality of components is manufactured in a module form, so that simple assembly is possible. It can be used for education because it is designed as.

3 is a diagram showing the structure of a receiver of a radio and RF radio receiver using a PLL according to an embodiment of the present invention.

First, the receiver may receive an RF signal in the air through ① antenna. Since frequencies corresponding to noise components are mixed in the RF signal received through the antenna, the receiver can perform filtering using a ② band select filter so that only the desired frequency band can be amplified. In this case, when multiple channels are used, all channels (In-band) must be passed, and when the same antenna is used, a duplexer may also serve as a band selection filter.

After that, the receiver can amplify the RF signal containing noise in the air while suppressing the amplification of noise as much as possible by using a ③ Low Noise Amplifier.

The receiver can perform bandpass filtering once again using a ④ Image Reject Filter to prevent the fatal image frequency from being transmitted to the mixer from among the ③ low noise amplifiers amplified. This ④ image removal filter additionally removes spurious frequencies and separates the RF and IF stages to improve the stability of the receiver.

The receiver can down-convert the frequency of the amplified RF signal through the ③ low-noise amplifier to the IF band by using the ⑤RF Down Mixer.

At this time, the ⑥RF Local Oscillator of the receiver can supply the LO frequency for frequency synthesis to the ⑤RF down mixer. ⑥RF local oscillator can select channel by changing LO frequency in case of communication requiring channel selection.

⑦Phase Locked Loop of the receiving part allows the output frequency of ⑥RF local oscillator to be fixed at a constant frequency without shaking, while elaborating the voltage of the VCO (voltage-regulated oscillator) used as ⑥RF local oscillator through the control input. By adjusting it, you can move and fix the output frequency of the ⑥RF local oscillator to the desired frequency. That is, the ⑦ phase locked loop may include a function of a control unit that performs frequency tuning.

Since the ⑧ channel select filter of the receiver includes all channels of RF signals converted to IF frequency, only the desired channel can be selected by bandpass filtering among them. At this time, since the spacing between the channels is mostly narrow, a filter having good skirt characteristics is required.

Since the receiver cannot sufficiently amplify the weak RF signal with only the ③ low-noise amplifier of the RF stage, it can perform a significant amount of signal amplification through the ⑨ IF amplifier after channel filtering. In this case, the receiver may use a form that can arbitrarily adjust the gain of the IF amplifier, such as VGA (Variable Gain Amplifier) or AGC (Auto Gain Control), when precise power control is required.

Afterwards, the receiver finishes channel selection and amplification at the IF stage, and downconversion mixing again using an IF Down Mixer to convert to the baseband, which is the frequency band containing the original signal by removing the carrier frequency. You can do it.

Finally, the receiver can supply the LO frequency to the ⑩IF down mixer to convert the IF signal into a baseband signal by using the ⑪IF Local Oscillator. At this time, the ⑪IF local oscillator may additionally use an IF PLL to fix the LO frequency.

4 is a diagram showing the structure of a transmitter of a radio and RF radio receiver using a PLL according to an embodiment of the present invention.

Referring to FIG. 4, since the block diagram 410 of the transmitter is almost similar to the block diagram after the low-noise amplifier of the receiver is reversed as it is, only the subsequent stages will be described.

Unlike the receiver, the transmitter may have a constant input signal, and a power amp may be used to amplify the input signal into a signal of high power. However, power amplifiers often do not have sufficient gain due to their structure, and in order for the power amplifier to amplify with sufficient power, the input signal must also have a certain level of power.

To this end, the ① drive amplifier of the transmitter can solve the lack of gain of the power amplifier and at the same time provide sufficient input power to the power amplifier. At this time, since the ① driving amplifier is an amplifier with nonlinearity, unnecessary frequency components may be output.

In order to avoid such spurious frequency components from being amplified by the power amplifier, the transmitter can perform band-pass filtering that passes only the channel bands in use by using a ② band select filter.

The ③ power amplifier of the transmitter can perform the function of amplifying power so that a signal with sufficient power can be sent out at the final stage. At this time, ③ power amplifier amplifies the signal with gain, but unlike other amplifiers, it is designed to flow a lot of current at the output, so it can digest high dBm power at the output.

The specifications of the transmitter are thoroughly determined according to the specifications of the ③ power amplifier. In the case of small terminal systems, output matching and some major components are combined with PA MMIC (Monolithic Microwave Integrated Circuit) bare chips. It is often used as an integrated PAM (Power Amp Module). Using PAM reduces the area of the transmitter while reducing the sensitivity of output matching, making it easier to implement the system, and improving the burden on the reliability of the ③ power amplifier, which is a sensitive component with high failure rate, can be improved through PAM.

Even though the transmitter is the end that sends the signal and not the end that receives the signal, there is a possibility that the signal will be reversed through the antenna, so it is necessary to fix the direction of the signal so that the signal can be transmitted only in a specific direction. .

The ④ isolator of the transmitter can cause the signal to flow in the output direction, and the signal in the reverse direction to be terminated so that it is not transmitted in the reverse direction. Through this, it is possible to prevent the ③ power amplifier from being damaged by preventing the signal from flowing in the reverse direction and disturbing the impedance of the ③ power amplifier 　 output stage.

In addition, many ③ power amplifiers mismatch the output side and perform power matching, so the reflection coefficient of the output side has a bad characteristic, and the voltage standing wave ratio (VSWR) is increased. It can also play a role of preventing damage to the ③power amplifier caused by unnecessary standing wave voltage jammed at the output stage.

Like the driving amplifier stage, nonlinear spurious frequency components may appear at the rear stage of the nonlinear amplifier. The ⑤Band Select Filter of the transmitter can cut them out and finally perform bandpass filtering to emit only the desired frequency band to the outside. If a system shares an antenna with a receiver, a duplexer can also play a corresponding role.

Finally, the ⑥ antenna of the transmitter can radiate the electric signal change on the wire to electromagnetic waves in the air.

On the other hand, the communication method performed by a communication device in which a radio capable of two-way communication between individuals and an FM radio receiver capable of receiving FM radio according to the present invention is integrally manufactured is written as a program that can be executed on a computer, and It can be implemented in a variety of recording media such as reading media and digital storage media.

Implementations of the various techniques described herein may be implemented in digital electronic circuitry, or in computer hardware, firmware, software, or combinations thereof. Implementations may include a data processing device, e.g., a programmable processor, a computer, or a computer program product, e.g., a machine-readable storage device (computer readable It can be implemented as a computer program tangibly embodied in a possible medium). Computer programs such as the above-described computer program(s) may be recorded in any type of programming language, including compiled or interpreted languages, and as a standalone program or in a module, component, subroutine, or computing environment. It can be deployed in any form, including as other units suitable for the use of. A computer program can be deployed to be processed on one computer or multiple computers at one site or to be distributed across multiple sites and interconnected by a communication network.

Processors suitable for processing a computer program include, by way of example, both general and special purpose microprocessors, and any one or more processors of any kind of digital computer. In general, the processor will receive instructions and data from read-only memory or random access memory or both. Elements of the computer may include at least one processor that executes instructions and one or more memory devices that store instructions and data. In general, a computer may include one or more mass storage devices that store data, such as magnetic, magnetic-optical disks, or optical disks, or receive data from or transmit data to them, or both. It can also be combined so as to be. Information carriers suitable for embodying computer program instructions and data are, for example, semiconductor memory devices, for example, magnetic media such as hard disks, floppy disks and magnetic tapes, Compact Disk Read Only Memory (CD-ROM). ), Optical Media such as DVD (Digital Video Disk), Magnetic-Optical Media such as Floptical Disk, ROM (Read Only Memory), RAM (RAM) , Random Access Memory), flash memory, EPROM (Erasable Programmable ROM), EEPROM (Electrically Erasable Programmable ROM), and the like. The processor and memory may be supplemented by or included in a special purpose logic circuit structure.

Further, the computer-readable medium may be any available medium that can be accessed by a computer, and may include all computer storage media.

While this specification includes details of a number of specific implementations, these should not be construed as limiting to the scope of any invention or claimable, but rather as a description of features that may be peculiar to a particular embodiment of a particular invention. It must be understood. Certain features described herein in the context of separate embodiments may be implemented in combination in a single embodiment. Conversely, various features described in the context of a single embodiment can also be implemented in multiple embodiments individually or in any suitable sub-combination. Furthermore, although features operate in a particular combination and may be initially described as so claimed, one or more features from a claimed combination may in some cases be excluded from the combination, and the claimed combination may be a sub-combination. Or sub-combination variations.

Likewise, although operations are depicted in the drawings in a specific order, it should not be understood that such operations must be performed in that particular order or sequential order shown or that all illustrated operations must be performed in order to obtain a desired result. In certain cases, multitasking and parallel processing can be advantageous. In addition, separation of the various device components in the above-described embodiments should not be understood as requiring such separation in all embodiments, and the program components and devices described are generally integrated together into a single software product or packaged in multiple software products. It should be understood that you can.

On the other hand, the embodiments of the present invention disclosed in the specification and drawings are only presented specific examples to aid understanding, and are not intended to limit the scope of the present invention. It is apparent to those of ordinary skill in the art that other modified examples based on the technical idea of the present invention may be implemented in addition to the embodiments disclosed herein.

100: communication system
110: communication device
111: walkie talkie
112: FM radio receiver
113: common speaker
114: display
115: power supply
120, 130: radios existing in different regions
140: base station

Claims (3)

A radio for performing communication with other radios using the first frequency band;
An FM radio receiver capable of listening to a disaster broadcast using a second frequency band different from the first frequency band; And
A common speaker that selectively outputs signals received through the radio and FM radio receiver
Including,
The walkie-talkie and FM radio receiver,
A communication device that uses a frequency modulation method using a phase-locked loop (PLL). The method of claim 1,
The common speaker,
When signals are simultaneously received through the radio and the FM radio receiver, a communication device for excluding the signal from the FM radio receiver by an output difference and outputting the signal from the radio. The method of claim 1,
The walkie-talkie and FM radio receiver,
A communication device that is integrally created in one case.

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