CN220673767U - Digital and analog signal mixed transmission transceiver - Google Patents
Digital and analog signal mixed transmission transceiver Download PDFInfo
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- CN220673767U CN220673767U CN202321429139.9U CN202321429139U CN220673767U CN 220673767 U CN220673767 U CN 220673767U CN 202321429139 U CN202321429139 U CN 202321429139U CN 220673767 U CN220673767 U CN 220673767U
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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
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- 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
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Abstract
The utility model discloses a digital and analog signal mixed transmission transceiver, and belongs to the technical field of signal transceiving devices. The system comprises a digital-analog signal generating module, a digital-analog combining module, a modulation transmitting module and a receiving demodulation module; the analog signal and the digital signal are realized by a digital-analog signal generating module, the mixed transmission is realized by a digital-analog combining module, and the modulation transmitting module and the receiving demodulation module respectively realize mixed transmission and signal reception. The utility model has the advantages of wide application range, low transmission loss, strong anti-interference capability and the like.
Description
Technical Field
The present utility model relates to a signal transceiver, and more particularly, to a digital and analog signal hybrid transmission transceiver.
Background
In order to solve the simultaneous transmission problem of mixed and overlapped digital signals and analog signals in short-distance optical communication, especially in the optical carrier wireless transmission scene of the Internet of things and the Internet of vehicles, the signal transmission method which is simple to operate, wide in application range, low in transmission loss and strong in anti-interference capability is needed.
Disclosure of Invention
In order to overcome the defects in the prior art, the utility model aims to provide the digital and analog signal mixed transmission transceiver which has the advantages of wide application range, low transmission loss and strong anti-interference capability.
In order to achieve the above purpose, the present utility model adopts the following technical scheme:
a digital and analog signal mixed transmission transceiver comprises a digital-analog signal generation module, a digital-analog combining module, a modulation transmitting module and a receiving demodulation module;
the digital-analog signal generating module comprises a signal generator and an STM32 processor, wherein the signal generator is used for generating an analog signal and a high-frequency carrier signal, and the STM32 processor is used for carrying out digital coding and FSK modulation on the input four-bit digital 24-bit code element length to obtain a digital signal which is different from a voice signal frequency band;
the digital-analog combining module combines the analog signal and the digital signal through an adder to generate a combined signal;
the modulation transmitting module carries out AM modulation on the combined signal and the high-frequency carrier signal generated by the signal generator through a multiplier, filters high-frequency harmonic waves through a low-pass filter, amplifies the high-frequency harmonic waves through a power amplifier gain, and transmits the amplified high-frequency harmonic waves to the receiving demodulation module through a band-pass filter through an antenna;
the receiving demodulation module amplifies the signal gain of the received signal through the low power amplifier, the higher harmonic component and the environmental noise are filtered through the band-pass filter, the modulation signal is recovered through the envelope detector, the digital signal and the analog signal are processed in a branching mode through the band-pass filter and the low-pass filter after passing through the AGC module, the analog signal is displayed through the oscilloscope, and the digital signal is displayed through the nixie tube after being processed through the STM32 processor.
Preferably, the modulation transmitting module and the antenna adopt an SMA plug.
Compared with the prior art, the digital and analog signal mixed transmission transceiver disclosed by the utility model has the following advantages:
1. the digital signal adopts BCD coding, each decimal digit can be represented by four digits, the digital signal is realized by utilizing the timing function of STM32, the length of the coding pulse width is variable, and the pulse width size can be set according to the requirement of the transmission rate. Compared with the FPGA programmable device, the system converts the mixed signals into pure analog signals for transmission, the complexity of the whole system is reduced, and a chip with high integration level and a special digital-analog mixed transmission chip are used, so that the hardware circuit is concise and the design cost is lower.
2. The present transceiver system employs AM modulation, an amplitude modulation technique that embeds amplitude variations of an information signal into a carrier signal. Compared to some existing modulation techniques, AM modulation has some of the following advantages:
(1) simple and easy to realize: AM modulation is a relatively simple modulation technique that is easy to implement and understand. It involves only amplitude variations of the signal and can be implemented using a simple linear modulator.
(2) The compatibility is good: AM signals are compatible with many receiving devices, including conventional tuned radios and broadcast receivers. This makes AM broadcasting a widely used broadcasting form, especially in remote areas or rural areas.
3. The whole transceiver module is simple and convenient to build and debug, has high visualization degree compared with the prior operation technology, adopts components and parts which are convenient to learn and communicate, and has low transmission loss and low power consumption.
4. The digital signal is converted into an analog signal by FSK (frequency shift keying) modulation, and is characterized in that the digital signal is transmitted by changing the carrier frequency. Taking 2FSK modulation as an example, 2FSK modulation uses different carrier frequencies to represent different digital bits, typically one frequency represents a binary "0" and the other frequency represents a binary "1". The modulation mode can realize data transmission through frequency switching. Compared to ASK (amplitude keying) modulation, FSK modulation has the following advantages:
(1) the anti-interference capability is strong: FSK modulation is relatively tolerant to noise and interference. Since the representation of the information is through a change in frequency, rather than a change in amplitude, the interference caused by the change in amplitude has less impact on the FSK during transmission.
(2) The bandwidth utilization efficiency is high: FSK modulation can generally achieve higher data transmission rates because different digital bits can be represented by different frequencies, thereby transmitting more information within the same spectrum bandwidth.
(3) The multipath fading resistance is strong: in wireless communications, multipath fading is the phase and amplitude distortion caused by the propagation of a signal through multiple paths. The effect of FSK modulation on multipath fading is relatively small, since frequency variations are insensitive to phase variations.
Overall, FSK modulation has advantages over ASK modulation in terms of interference immunity, bandwidth utilization efficiency, and multipath fading resistance.
Drawings
FIG. 1 is a flow chart of overall signal transceiving;
FIG. 2 is a signal combining flow chart;
fig. 3 is a signal modulation flow chart.
Detailed Description
The structure and principles of the present utility model are fully described in connection with specific embodiments so that those skilled in the art may fully understand and practice the utility model.
As shown in fig. 1 to 3, a digital and analog signal hybrid transmission transceiver includes a digital-analog signal generating module, a digital-analog combining module, a modulation transmitting module, and a receiving and demodulating module;
the mixed transmission is realized by a digital-analog combining module, and the mixed transmission and signal receiving are respectively realized by a transmitting module and a receiving demodulation module.
The method comprises the following steps:
the digital-analog signal generating module comprises a signal generator and an STM32 processor, wherein the signal generator is used for generating an analog signal and a high-frequency carrier signal, and the STM32 processor is used for carrying out digital coding and FSK modulation on the input four-bit digital 24-bit code element length to obtain a digital signal which is different from a voice signal frequency band;
the digital-analog combining module combines the analog signal and the digital signal through an adder to generate a combined signal;
the modulation transmitting module carries out AM modulation on the combined signal and the high-frequency carrier signal generated by the signal generator through a multiplier, filters high-frequency harmonic waves through a low-pass filter, amplifies the high-frequency harmonic waves through a power amplifier gain, and transmits the amplified high-frequency harmonic waves to the receiving demodulation module through a band-pass filter through an antenna;
the receiving demodulation module amplifies the signal gain of the received signal through the low power amplifier, the higher harmonic component and the environmental noise are filtered through the band-pass filter, the modulation signal is recovered through the envelope detector, the digital signal and the analog signal are processed in a branching mode through the band-pass filter and the low-pass filter after passing through the AGC module, the analog signal is displayed through the oscilloscope, and the digital signal is displayed through the nixie tube after being processed through the STM32 processor.
Preferably, the modulation transmitting module and the antenna adopt an SMA plug.
In a preferred embodiment, the analog signal frequency range is 100Hz-5kHz, the carrier frequency range is 20-30MHz, and the channel bandwidth is no greater than 50kHz. And (5) placing the digital signal at 8kHz-16kHz to be combined with the voice signal, and sending and receiving.
The above-described embodiments are merely preferred embodiments of the present utility model and are not intended to limit the present utility model in any way. Any person skilled in the art can make many possible variations and modifications to the technical solution of the present utility model or modifications to equivalent embodiments using the above disclosed method without departing from the technical principle and scope of the solution of the present utility model. Therefore, any combination, modification or substitution of the technical features disclosed in the present utility model according to the technical substance of the present utility model should be within the protection scope of the technical solution of the present utility model, wherever the principle or the solution of the present utility model is not deviated.
Claims (2)
1. The digital and analog signal mixed transmission transceiver is characterized by comprising a digital-analog signal generation module, a digital-analog combining module, a modulation transmitting module and a receiving and demodulating module;
the digital-analog signal generating module comprises a signal generator and an STM32 processor, wherein the signal generator is used for generating an analog signal and a high-frequency carrier signal, and the STM32 processor is used for carrying out digital coding and FSK modulation on the input four-bit digital 24-bit code element length to obtain a digital signal which is different from a voice signal frequency band;
the digital-analog combining module combines the analog signal and the digital signal through an adder to generate a combined signal;
the modulation transmitting module carries out AM modulation on the combined signal and the high-frequency carrier signal generated by the signal generator through a multiplier, filters high-frequency harmonic waves through a low-pass filter, amplifies the high-frequency harmonic waves through a power amplifier gain, and transmits the amplified high-frequency harmonic waves to the receiving demodulation module through a band-pass filter through an antenna;
the receiving demodulation module amplifies the signal gain of the received signal through the low power amplifier, the higher harmonic component and the environmental noise are filtered through the band-pass filter, the modulation signal is recovered through the envelope detector, the digital signal and the analog signal are processed in a branching mode through the band-pass filter and the low-pass filter after passing through the AGC module, the analog signal is displayed through the oscilloscope, and the digital signal is displayed through the nixie tube after being processed through the STM32 processor.
2. A mixed digital and analog signal transceiver as claimed in claim 1, wherein said modulation and transmission module and said antenna are SMA plugs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321429139.9U CN220673767U (en) | 2023-06-07 | 2023-06-07 | Digital and analog signal mixed transmission transceiver |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321429139.9U CN220673767U (en) | 2023-06-07 | 2023-06-07 | Digital and analog signal mixed transmission transceiver |
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| Publication Number | Publication Date |
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| CN220673767U true CN220673767U (en) | 2024-03-26 |
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| CN202321429139.9U Active CN220673767U (en) | 2023-06-07 | 2023-06-07 | Digital and analog signal mixed transmission transceiver |
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2023
- 2023-06-07 CN CN202321429139.9U patent/CN220673767U/en active Active
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