CN116527073B - Ultra-small double-frequency-band handheld radio station - Google Patents
Ultra-small double-frequency-band handheld radio station Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/3827—Portable transceivers
- H04B1/3833—Hand-held transceivers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/3827—Portable transceivers
- H04B1/3833—Hand-held transceivers
- H04B1/3838—Arrangements for reducing RF exposure to the user, e.g. by changing the shape of the transceiver while in use
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q1/00—Details of selecting apparatus or arrangements
- H04Q1/02—Constructional details
- H04Q1/04—Frames or mounting racks for selector switches; Accessories therefor, e.g. frame cover
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention relates to a microminiature double-frequency handheld radio station, which comprises a host shell, a bottom shell, an inner core, independent keys and a battery, wherein the host shell is formed by plastic injection molding, the bottom shell is an aluminum alloy die casting, and a handheld part is in a circular arc structure; the inner core adopts an aluminum alloy bracket; the internal movement comprises a power supply processing unit, a radio frequency processing unit and a baseband processing unit; the cavity and the internal shield of the radio frequency processing unit are made of aluminum alloy materials, and are formed by adopting decomposition type numerical control processing and screw assembly; the surface of the device with the largest heating value in the inner core is stuck with a silica gel heat dissipation pad, and heat is led into the aluminum alloy bottom shell through the heat dissipation pad and is dissipated into the air through the surface of the host shell; a glue spraying port is reserved at a key position of the host shell, and a waterproof ring is arranged at a nut at the position of a battery connection probe; the components are wide temperature range and high reliability. The invention adopts miniaturized design, adopts SDR software radio technology, adopts high harmonic suppression ratio technology, adopts audio noise reduction processing technology, and has high sensitivity.
Description
Technical Field
The invention belongs to the technical field of communication, and particularly relates to a microminiature dual-band handheld radio station.
Background
The current portable dual-band radio station that army used is bigger, and weight is heavier, and its volume is 251mm x 80mm x 291mm, and weight is about 6Kg, and current portable dual-band radio station is bulky heavy, is unfavorable for carrying and use, hinders the tactics action of fighter implementation, and a miniaturized handheld dual-band radio station of urgent need.
Disclosure of Invention
The invention aims to provide a microminiature double-frequency-band handheld radio station, the shell of which adopts PC (EXL 9330), and the material has the characteristics of high strength and light weight. The inner core adopts an aluminum alloy (AL 6063)) bracket, which is convenient for grounding and heat dissipation. The hand-held position is minimum in size, and the arc design is adopted, so that the hand-held position accords with human engineering, is light in weight, and has the following overall dimension: 152mm by 61mm by 36.5mm, and the weight is less than or equal to 0.5Kg.
The invention provides a microminiature double-frequency handheld radio station, which comprises a host shell, a bottom shell, an inner core, independent keys and a battery, wherein the host shell is formed by plastic injection molding, the bottom shell is an aluminum alloy die casting, and a handheld part is in a circular arc structure; the inner machine core adopts an aluminum alloy bracket;
the internal movement adopts a modularized design and comprises a power supply processing unit, a radio frequency processing unit and a baseband processing unit, wherein the radio frequency processing unit comprises a transmitting unit, a receiving unit and a frequency combining unit, and the baseband processing unit comprises an audio unit and a display control unit;
the cavity and the internal shield of the radio frequency processing unit are made of aluminum alloy materials, and are formed by adopting decomposition type numerical control processing and screw assembly;
the device surface with the largest heating value in the inner core is stuck with a silica gel heat dissipation pad, and heat is led into the aluminum alloy bottom shell through the heat dissipation pad and is dissipated into the air through the surface of the host shell; a glue spraying port is reserved at a key position of the host shell, and a waterproof ring is arranged at a nut at a battery connection probe;
the components in the inner core are wide-temperature high-reliability components, so that national standard requirements of high and low temperature, high altitude, water resistance and impact drop are met.
Further, a CPU in the baseband processing unit is built by an ARM/DSP/FPGA together and is used for realizing the function of SDR software radio.
Further, a high harmonic suppression ratio technology is adopted, the output end of the final-stage PA adopts a balanced amplifying structure, two paths of constant-amplitude signals of 0 DEG and 180 DEG are led out through a balun, and then the two paths of signals are synthesized through the balun at the output end; the odd harmonics are restrained in a segmented mode through a segmented filter; the output end adopts a segmented structure, and an elliptic low-pass filter is introduced to inhibit third harmonic waves.
Further, the noise reduction processing process of the audio unit is as follows:
uplink: the audio MIC single end is input into a noise reduction IC, converted into an analog differential signal after audio noise reduction and gain control, input into a CODEC, converted into a digital audio IIS after audio gain control, input into a DSP, and subjected to digital noise reduction and AMAGC dynamic processing;
downlink link: the digital audio signal is transmitted to the DSP through the audio interface, the DSP transmits the digital audio signal to the CODEC in an IIS format to convert the digital audio signal into differential analog voice, the differential analog voice is transmitted to the noise reduction IC to carry out gain control and noise reduction treatment, the single-ended analog voice is transmitted to the audio power amplifier to carry out audio amplification and then respectively drive the earphone and the loudspeaker, and the noise reduction effect of the AM, the FM and the digital audio signal is enhanced through dual treatment of digital DSP and hardware noise reduction.
Further, a high gain pass device is used to reduce the noise figure of the system while reasonably distributing the link gain.
By means of the scheme, the ultra-small double-frequency-band handheld radio station has the following technical effects:
(1) By adopting a miniaturized design
The handheld dual-band radio station is small in size, light in weight and more suitable for being used by troops in a basic unit in a portable manner. The material has the characteristics of high strength and light weight. The inner core adopts an aluminum alloy (AL 6063)) bracket, which is convenient for grounding and heat dissipation. The hand-held position is minimum in size, and the arc design is adopted, so that the hand-held position accords with human engineering, is light in weight, and has the following overall dimension: 152mm by 61mm by 36.5mm, and the weight is less than or equal to 0.5Kg.
(2) Radio technology adopting SDR software
The CPU in the baseband module is built by ARM/DSP/FPGA together, so that the function of SDR software radio can be realized. According to the requirements, under the condition of not changing the hardware structure, the brand new service and function derived from the new combat concept can be conveniently and completely realized through software configuration and upgrading, and meanwhile, the newly added service and function can not influence the capability of the original system, so that the variety and quantity of communication equipment are effectively reduced. By adopting the SCA software architecture, configuration management, interface encapsulation and the like can be realized, waveform software and hardware are separated, and the expansion capacity of the system is improved; the universal software platform performs unified management on hardware platform resources and provides a consistent running environment for waveform application.
(3) By using high harmonic suppression ratio technique
The output end of the final-stage PA adopts a balanced amplifying structure, two paths of constant-amplitude signals of 0 DEG and 180 DEG are led out through the balun, and then the two paths of signals are synthesized through the balun at the output end. After adopting the balance structure, the even harmonic of the output end can be inhibited by 25 dBc. Odd harmonics (mainly third and fifth harmonics) are suppressed in sections by a section filter. The output end adopts a segmented structure, an elliptic low-pass filter is introduced, and the suppression of third harmonic can reach 30dB.
(4) An audio noise reduction processing technology is adopted.
Uplink: the audio MIC single end is input to the noise reduction IC, converted into an analog differential signal after audio noise reduction and gain control, input to the CODEC, converted into a digital audio IIS after audio gain control, and input to the DSP, and digital noise reduction and AMAGC dynamic processing can be performed. Downlink link: the digital audio signal is transmitted to the DSP through the audio interface, the DSP transmits the digital audio signal to the CODEC in an IIS format to convert the digital audio signal into differential analog voice, the differential analog voice is transmitted to the noise reduction IC to carry out gain control and noise reduction treatment, the single-ended analog voice is transmitted to the audio power amplifier to carry out audio amplification and then respectively drive the earphone and the loudspeaker, and the noise reduction effect of the AM, the FM and the digital audio signal is greatly enhanced through double treatment of digital DSP and hardware noise reduction.
(5) Has high sensitivity
The high-gain access device is adopted, so that the noise coefficient of the system is reduced, and meanwhile, the link gain can be reasonably distributed.
The foregoing description is only an overview of the present invention, and is intended to provide a better understanding of the present invention, as it is embodied in the following description, with reference to the preferred embodiments of the present invention and the accompanying drawings.
Drawings
FIG. 1 is a schematic diagram of a miniature dual-band handheld station of the present invention; a is a first view, b is a second view;
FIG. 2 is a block diagram of a microminiature dual frequency handset host according to the present invention;
FIG. 3 is a schematic block diagram of a miniature dual-frequency handset of the invention;
FIG. 4 is a signal diagram of a receiver of a miniature dual-band handset of the invention;
FIG. 5 is a schematic block diagram of a miniature dual-band handheld station transmitter of the present invention;
FIG. 6 is a schematic block diagram of a baseband module of a miniature dual-band handheld station of the present invention;
FIG. 7 is a diagram of a software architecture for a microminiature dual frequency handset in accordance with the present invention;
FIG. 8 is a diagram of an interface of a software platform of a subminiature dual-frequency handheld radio station of the present invention;
fig. 9 is a block diagram of the audio processing of a miniature dual-band handheld station of the present invention.
Detailed Description
The following describes in further detail the embodiments of the present invention with reference to the drawings and examples. The following examples are illustrative of the invention and are not intended to limit the scope of the invention.
The embodiment provides a microminiature handheld radio station, which has the following specific scheme:
1. handheld dual-band radio station structure
The handheld dual-band radio station shell adopts PC (EXL 9330), and the material has the characteristics of high strength and light weight. The inner core adopts an aluminum alloy (AL 6063)) bracket, which is convenient for grounding and heat dissipation. The hand-held position is minimum in size, and the arc design is adopted, so that the hand-held position accords with human engineering, is light in weight, and has the following overall dimension: 152mm by 61mm by 36.5mm, and the weight is less than or equal to 0.5Kg.
The host shell adopts plastic injection molding, the radio frequency/terminal module cavity and the internal shield are made of antirust aluminum alloy materials, and the host shell adopts decomposition type numerical control processing, and screws are assembled and formed, so that the processing difficulty is simplified, the assembly and disassembly are convenient, the deformation of the shell is small, the rigidity is good, and the processing precision of the shell is easy to ensure.
The bottom shell adopts an aluminum alloy die casting, so that the structural strength is high, and deformation and failure are not easy to occur; all parts are connected by screws, and the key parts are independently designed, so that the waterproof reliability is improved. The surface of the device with the largest heating value is stuck with a silica gel heat dissipation pad, and heat is led into the aluminum shell through the heat dissipation pad and finally is dissipated into the air through the surface of the rubber shell. Glue spraying ports are reserved at key positions of the face shell, and waterproof rings are added at nuts and the like at battery connection probes. Meanwhile, the components are wide-temperature high-reliability components, so that national standard requirements of high and low temperature, high altitude, water resistance and impact drop are met. The appearance of the radio station is shown in the following figure 1, and the radio station comprises an indicator lamp 1, a MIC hole 2, a display screen 3, a data interface 4, a navigation keyboard 5, a loudspeaker 6, an antenna interface 7, a frequency mode knob 8, a switch key 9, a PPT key 10, a function key 11, a battery 12 and a battery charging pole piece 13.
2. Handheld dual-band radio station mechanism assembly
The handheld dual-band radio station adopts a modularized design. The system is divided functionally and mainly comprises a receiving unit, a transmitting unit, a frequency synthesizer unit, an audio unit, a display control unit and a power supply unit. The detachable upper partition is composed of two detachable modules, namely a main board module and an auxiliary board module.
The host hardware adopts a scheme with high integration level and a miniaturized device, and the PCB layout maximizes the utilization area space. Adopts modularized design, adopts soft connection between each other, has compact structural space and high space utilization rate. The handheld dual-band radio station host computer composition module comprises a main board, an auxiliary board and an FPC board. The main functions of the main board are modulation, demodulation and control of signals, the auxiliary board mainly processes keys and interfaces, and the radio station composition block diagram is shown as 2.
3. Hand-held double-frequency-band radio station working principle
Hand-held double-frequency-band radio station host principle
The functional block diagram of the handheld dual-band station host is shown in fig. 3.
Principle of transceiver (II)
The sending process comprises the following steps: after audio amplification and filtration, in an AM mode, audio signals are subjected to AD conversion, AM modulation through a DAC and an AM modulator, and then are amplified and filtered by power and then are transmitted; for the FM mode, the audio signal is subjected to AD conversion, sent to a frequency synthesizing unit for digital frequency modulation, then outputted with an intermediate frequency modulated carrier wave, and finally filtered, amplified in power and then transmitted.
And (3) collecting: the radio frequency signals received by the antenna are converted into modulated intermediate frequency signals through radio frequency conversion, and then the modulated intermediate frequency signals are subjected to intermediate frequency digital processing and demodulation after being subjected to filtering, amplifying and other processing. And obtaining a baseband signal, decoding the signal source, amplifying the audio frequency through audio frequency filtering, and sending the audio frequency to a loudspeaker to restore the audio frequency signal.
Flow of receiving signals
The receiving path of the receiver in this embodiment adopts a superheterodyne receiving scheme, so as to improve the anti-interference capability of the receiver, and the receiver mainly includes: an RF electrically tuned Band Pass Filter (BPF), a Low Noise Amplifier (LNA), a Mixer circuit (Mixer), an intermediate frequency Filter (IF Filter), an intermediate frequency amplification (IF Amp), and an intermediate frequency processing (IF Processor) section. A receiver signal block diagram is shown in fig. 4.
The signal enters the electric tuning attenuator through the antenna and the receiving and transmitting switch, then is sent to the electric tuning filter, the filter filters out-of-band interference signals and then is sent to the low noise amplifier to obtain enough signal gain, and then the out-of-band interference signals are filtered through the electric tuning attenuator and the electric tuning filter, and the frequency conversion treatment is carried out by the mixer to output variable intermediate frequency signals. The frequency-converted signal is selected by a crystal filter, the signal of the high-gain intermediate frequency amplifier is amplified and sent to an intermediate frequency processor for sampling, and finally digital demodulation is carried out by software, and the required audio signal is obtained through restoration. Wherein the local oscillator signal is provided by a frequency synthesizer unit.
(III) transmitter Signal principle
The transmitter unit directly amplifies and outputs the local oscillation frequency. The transmitter comprises a transmitter control circuit, a power amplifier and the like, and mainly comprises the following parts: the functional block diagram of the variable gain control, the push amplifier, the power amplifier, the radio frequency segmented low-pass filter bank, the directional coupler, the transceiver switch and the like is shown in fig. 5.
Under the FM modulation mode, the frequency combining unit carries out FM modulation, and the modulated excitation signal directly enters the transmitting unit and is transmitted after passing through the variable gain control, the amplification, the receiving and transmitting switch, the filtering and the directional coupler. The forward voltage and the threshold voltage detected by the directional coupler are acted on the variable gain control circuit after passing through the ALC integrating circuit, so that the output level of the transmitting signal is ensured to meet the index requirement. In the AM modulation mode, the digitized audio signal is sent to an ALC circuit of a transmitting unit through a DAC, added to a threshold voltage to form a total control signal, and amplitude modulation is completed through acting on a variable gain control circuit.
(IV) working principle of baseband module
The display control unit is used as a control core of the whole radio station and mainly has the following functions: the method mainly completes panel display, keyboard input, whole machine control, network port communication, audio signal processing and the like. The functional block diagram is shown in fig. 6.
The CPU in the baseband module is built by ARM/DSP/FPGA together, so that the function of SDR software radio can be realized. The radio waveform is loaded. The method adopts the design concept and standard of the software radio, accords with the standard software communication system structure, has the characteristics of portability, interchangeability, interoperability, reusability, scalability, safety and the like, is compatible with various communication systems on a set of hardware platform, realizes the separation of the hardware platform and the software waveform, can conveniently and completely realize brand new services and functions derived from new combat concepts through software configuration and upgrading under the condition of not changing the hardware structure according to requirements, and simultaneously, the newly added services and functions can not influence the capability of the original system, thereby effectively reducing the variety and the quantity of communication equipment. The software architecture employed is shown in fig. 7.
Software radio architecture advantage: the SCA software architecture is adopted to realize configuration management, interface encapsulation and the like, realize the separation of waveform software and hardware and improve the expansion capability of the system; the universal software platform performs unified management on hardware platform resources and provides a consistent running environment for waveform application. The specific interfaces of the software platform are shown in fig. 8.
The ultra-small double-frequency band handheld radio station has the following technical effects:
first, miniaturizing design
The handheld dual-band radio station is small in size, light in weight and more suitable for being used by troops in a basic unit in a portable manner. The material has the characteristics of high strength and light weight. The inner core adopts an aluminum alloy (AL 6063)) bracket, which is convenient for grounding and heat dissipation. The hand-held position is minimum in size, and the arc design is adopted, so that the hand-held position accords with human engineering, is light in weight, and has the following overall dimension: 152mm by 61mm by 36.5mm, and the weight is less than or equal to 0.5Kg.
Radio technology of SDR software
The CPU in the baseband module is built by ARM/DSP/FPGA together, so that the function of SDR software radio can be realized. The software radio design is adopted to be compatible with various communication systems on a set of hardware platform, the separation of the hardware platform and the software waveform is realized, and the brand new service and function derived from new combat concepts can be conveniently and completely realized through software configuration and upgrading under the condition of not changing the hardware structure according to requirements, meanwhile, the newly added service and function can not influence the capability of the original system, and the variety and quantity of communication equipment are effectively reduced. The SCA software architecture can be used for realizing configuration management, interface encapsulation and the like, realizing the separation of waveform software and hardware and improving the expansion capability of the system; the universal software platform performs unified management on hardware platform resources and provides a consistent running environment for waveform application.
(III) high harmonic suppression ratio technique
The output end of the final-stage PA adopts a balanced amplifying structure, two paths of signals with equal amplitude of 0 DEG and 180 DEG are led out through the balun, and then the two paths of signals are synthesized through the balun at the output end. After adopting the balance structure, the even harmonic of the output end can be inhibited by 25 dBc. Odd harmonics (mainly third and fifth harmonics) are suppressed in sections by a section filter. The output end adopts a segmented structure, an elliptic low-pass filter is introduced, and the suppression of third harmonic can reach 30dB.
(IV) Audio noise reduction processing technique
The audio processing block diagram is shown in fig. 9, in which the AudioCODEC converts an analog audio signal into a digital audio signal, the noise reduction IC is an audio noise reduction process, and the AudioPA is a G-class audio power amplifier and a D-class audio power amplifier.
Uplink: the audio MIC single end is input to the noise reduction IC, converted into an analog differential signal after audio noise reduction and gain control, input to the CODEC, converted into a digital audio IIS after audio gain control, and input to the DSP, and digital noise reduction and AMAGC dynamic processing can be performed. Downlink link: the digital audio signal is transmitted to the DSP through the audio interface, the DSP transmits the digital audio signal to the CODEC in an IIS format to convert the digital audio signal into differential analog voice, the differential analog voice is transmitted to the noise reduction IC to carry out gain control and noise reduction treatment, the single-ended analog voice is transmitted to the audio power amplifier to carry out audio amplification and then respectively drive the earphone and the loudspeaker, and the noise reduction effect of the AM, the FM and the digital audio signal is greatly enhanced through double treatment of digital DSP and hardware noise reduction.
(V) high sensitivity
Ground-air communication distance is greatly benefited by high-index hardware performance, and a receiver with high sensitivity is provided. The high-efficiency sensitivity is ensured in device model selection and software algorithm processing.
The simulation calculation model of the sensitivity can know that in order to improve the receiving sensitivity of the system, the sensitivity is only improved by reducing the noise coefficient of the system on the premise of determining the channel bandwidth and the demodulation threshold. Therefore, the channel device with high gain is selected, the noise coefficient of the system is reduced, and meanwhile, the link gain is reasonably distributed. At 25kHz bandwidth, the minimum quantization power according to the post-stage ADC is about-75 dBm, and in order to ensure the quality of the demodulated signal, a margin of 10dB-15dB is usually left, so that the link gain is required to reach at least 60dB on the premise of receiving sensitivity, and the link gain meets the requirement. The dynamic range of the whole system can reach 130dB.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, and it should be noted that it is possible for those skilled in the art to make several improvements and modifications without departing from the technical principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.
Claims (1)
1. The miniature double-frequency handheld radio station is characterized by comprising a host shell, a bottom shell, an inner core, independent keys and a battery, wherein the host shell is formed by plastic injection molding, the bottom shell is an aluminum alloy die casting, and a handheld part is in a circular arc structure; the inner machine core adopts an aluminum alloy bracket;
the internal movement adopts a modularized design and comprises a power supply processing unit, a radio frequency processing unit and a baseband processing unit, wherein the radio frequency processing unit comprises a transmitting unit, a receiving unit and a frequency combining unit, and the baseband processing unit comprises an audio unit and a display control unit;
the cavity and the internal shield of the radio frequency processing unit are made of aluminum alloy materials, and are formed by adopting decomposition type numerical control processing and screw assembly;
the device surface with the largest heating value in the inner core is stuck with a silica gel heat dissipation pad, and heat is led into the aluminum alloy bottom shell through the heat dissipation pad and is dissipated into the air through the surface of the host shell; a glue spraying port is reserved at a key position of the host shell, and a waterproof ring is arranged at a nut at a battery connection probe;
the components in the inner core are wide-temperature high-reliability components, so that the requirements of national military standard of high-low temperature, high altitude, water resistance and impact drop are met;
the CPU in the baseband processing unit is built by ARM/DSP/FPGA together and is used for realizing the function of SDR software radio;
the method comprises the steps that a high harmonic suppression ratio technology is adopted, a balanced amplifying structure is adopted at the output end of a final-stage PA, two paths of constant-amplitude signals of 0-degree and 180-degree are led out through a balun, and then the two paths of signals are synthesized through the balun at the output end; the odd harmonics are restrained in a segmented mode through a segmented filter; the output end adopts a segmented structure, an elliptic low-pass filter is introduced, and third harmonic is suppressed;
the noise reduction processing process of the audio unit is as follows:
uplink: the audio MIC single end is input into a noise reduction IC, converted into an analog differential signal after audio noise reduction and gain control, input into a CODEC, converted into a digital audio IIS after audio gain control, input into a DSP, and subjected to digital noise reduction and AMAGC dynamic processing;
downlink link: the digital audio signal is transmitted to the DSP through the audio interface, the DSP transmits the digital audio signal to the CODEC in an IIS format to convert the digital audio signal into differential analog voice, the differential analog voice is transmitted to the noise reduction IC to be subjected to gain control and noise reduction treatment, the single-ended analog voice is transmitted to the audio power amplifier to be subjected to audio amplification, and then the earphone and the loudspeaker are respectively driven, and the noise reduction effect of the AM, the FM and the digital audio signal is enhanced through double noise reduction treatment of the digital DSP and hardware;
high gain pass devices are used to reduce noise figure of the system while reasonably distributing link gain.
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| CN202310259450.1A CN116527073B (en) | 2023-03-17 | 2023-03-17 | Ultra-small double-frequency-band handheld radio station |
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| CN116527073B true CN116527073B (en) | 2024-04-12 |
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| CN116527073A (en) | 2023-08-01 |
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