Point-to-point short message transmission device based on audio channel

Abstract

The utility model provides a point-to-point short message transmission device based on an audio channel, which is applied to the technical field of information transmission, and comprises a main control module, a data coding module, an audio interface and a data decoding module, the received decoding data are integrated and then uploaded to a superior terminal; the data coding module is used for converting the received digital signal into an audio analog signal and transmitting the audio analog signal to a mobile phone end; the audio interface is used for respectively connecting the mobile phone end with the data encoding module and the data decoding module and carrying out data interaction through a voice channel of the mobile phone end; and the data decoding module is used for converting the received audio analog signal into a digital signal and transmitting the digital signal to the main control module. Point-to-point information transmission can be carried out based on an audio channel, the frame scale is small, the operation cost is low, the system is suitable for data transmission of a power system, and data comparison at the two ends of a cable is conveniently achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of information transmission, and in particular relates to a point-to-point short message transmission device based on an audio channel. Background Art

[0002] Information transmission involves sending commands or status information from one end to the other via a communication channel, where it is received by the other end. This involves both transmission and reception. Transmission media can be either wired or wireless. Wired transmission involves telephone lines or dedicated cables, while wireless transmission utilizes radio, microwave, and satellite technologies. Information cannot be altered during transmission, nor can it be transmitted or received by itself. It requires a carrier, such as data, language, or signals, and both the transmitter and receiver must share a common understanding of the carrier.

[0003] In power systems, there are many scenarios where data comparison is required between the two ends of a cable. The amount of data is small, typically consisting only of the measured waveform amplitude and phase. Conventional measurement devices lack communication capabilities, or establishing communication is expensive.

[0004] There are currently several ways to transmit information:

[0005] (1) Wide Area Network Solution: This solution uses a 4G terminal module + server architecture and utilizes the mature 4G network for remote data transmission. However, data transmission based on the 4G network cannot achieve point-to-point direct connection and requires the support of backend servers for reception and forwarding. This type of system is too large and too redundant for the needs of short messages, and the backend operation and maintenance costs are too high.

[0006] (2) Self-built network solution: A self-built wireless transmission system based on LoRa modules and corresponding repeater types. However, the communication distance of self-built base stations such as LoRa is limited, ranging from a few hundred meters to ten kilometers. A large number of terminals are required for relaying, and the actual communication distance cannot be guaranteed due to the terrain's restrictions on LoRa signals.

[0007] (3) Traditional DTMF solution: This method uses the manual keystroke method used when dialing a phone to send data to a single-phase terminal. However, the traditional DTMF solution has relatively few high and low frequencies and is often used in scenarios requiring remote input, such as telephone banking and dialing. In such scenarios, characters such as numbers, #, and * are sufficient, but the minimum 26 letters cannot be guaranteed to be transmitted, which greatly limits the application expansion of data transmission. Utility Model Content

[0008] In view of the above-mentioned problems in the prior art, the purpose of the present utility model is to provide a point-to-point short message transmission device based on an audio channel, which can perform point-to-point information transmission based on an audio channel, has a small framework scale and low operating cost, is suitable for data transmission in the power system, and facilitates data comparison at both ends of the cable.

[0009] A point-to-point short message transmission device based on an audio channel includes: a main control module, which is used to split the data received from the upper terminal and transmit it to the data encoding module for encoding, and to integrate the decoded data received from the data decoding module and upload it to the upper terminal;

[0010] The data encoding module is used to convert the received digital signal into an audio analog signal and transmit it to the mobile phone;

[0011] The audio interface is used to connect the mobile phone to the data encoding module and the data decoding module respectively, and to perform data interaction through the voice channel of the mobile phone;

[0012] The data decoding module is used to convert the received audio analog signal into a digital signal and transmit it to the main control module.

[0013] Preferably, it further comprises a display screen, which is connected to the main control module, and the main control module drives the display screen to display the operating status of each module and the transmitted data information.

[0014] Preferably, the main control module is used to split each character in the received upper terminal data into two corresponding frequency waveforms, and generate data corresponding to the frequency waveform, the frequency waveform includes a high-frequency wave and a low-frequency wave, the frequencies of the high-frequency wave include: 1209HZ, 1336HZ, 1477HZ, 1560HZ, 1633HZ, 1740HZ; the frequencies of the low-frequency wave include: 615HZ, 697HZ, 770HZ, 852HZ, 941HZ, 995HZ; the data includes letters AZ and numbers 0-9.

[0015] Preferably, after receiving the data transmitted by the main control module, the data encoding module outputs a corresponding actual waveform according to the correspondence between the data and the frequency waveform.

[0016] Preferably, the data encoding module includes a main control chip U2, which is communicatively connected to the main control module. The output port VOUT of the main control chip U2 outputs an audio analog signal, which is transmitted to the audio interface after passing through the amplification unit and the filtering unit.

[0017] Preferably, the amplification unit includes an operational amplifier U24, the positive input end of the operational amplifier U24 is connected to a resistor R9 and a capacitor C37 in series, and the other end of the capacitor C37 is connected to the output port VOUT of the main control chip U2; the reverse input end of the operational amplifier U24 is grounded through a resistor R127, and the output end of the operational amplifier U24 is connected to the audio interface through a filtering unit; a resistor R126 is also connected between the reverse input end and the output end of the operational amplifier U24, and the positive input end of the operational amplifier U24 is also connected to a resistor R14, and the other end of the resistor R14 is connected to a resistor R128 and a capacitor C116 in parallel, the other end of the resistor R128 is connected to the reference voltage VREF, and the other end of the capacitor C116 is grounded.

[0018] Preferably, the filtering unit includes a resistor R122, a capacitor C113, and a capacitor C121, one end of the resistor R122 is connected to the output end of the operational amplifier U24, and the other end is connected to the capacitor C113 and the capacitor C121 in parallel, the other end of the capacitor C113 is grounded, and the other end of the capacitor C121 is connected to the audio interface.

[0019] The beneficial effects of the present invention are as follows: the point-to-point short message transmission device based on the audio channel utilizes the audio channel of the mobile phone end to perform point-to-point information transmission, and the framework scale of the transmission device is small, the operating cost is low, it is suitable for data transmission in the power system, and it is convenient to realize data comparison at both ends of the cable.

[0020] By encoding and decoding letters A to Z and numbers 0-9 through the correspondence between frequency waveforms and data, information transmission is achieved, thereby enabling data interaction. Compared to wide area network solutions, this transmission device is smaller in scale and has lower operating costs. Compared to self-built network solutions, this transmission device can achieve information transmission over any distance based on the mobile phone terminal. Compared to traditional DTMF solutions, this transmission device guarantees the transmission of 26 letters and expands data.

[0021] A display screen is added to display the operating status of each module and the transmitted data information, which is convenient for monitoring the operation of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0023] Figure 1 This is a principle block diagram of the utility model;

[0024] Figure 2 It is a circuit diagram of the data encoding module of the utility model;

[0025] Figure 3 This is a frequency and data correspondence chart of the utility model. DETAILED DESCRIPTION

[0026] Example 1

[0027] like Figure 1 As shown, a point-to-point short message transmission device based on an audio channel includes a main control module, a data encoding module, an audio interface, a data decoding module, and a display screen. The main control module is used to split the data received from the upper terminal and transmit it to the data encoding module for encoding, and to integrate the decoded data received from the data decoding module and upload it to the upper terminal. The upper terminal can be a phase detector, current detector, line sequence monitor, etc., which is equivalent to a peripheral host and can be selected according to actual usage requirements.

[0028] Specifically, the main control module is used to split each character in the received upper terminal data into two corresponding frequency waveforms, and generate data corresponding to the frequency waveform. The frequency waveform includes high-frequency waves and low-frequency waves. The frequencies of the high-frequency waves include: 1209HZ, 1336HZ, 1477HZ, 1560HZ, 1633HZ, 1740HZ; the frequencies of the low-frequency waves include: 615HZ, 697HZ, 770HZ, 852HZ, 941HZ, 995HZ; the data includes letters AZ and numbers 0-9.

[0029] Among them, the corresponding relationship between the frequency waveform and the data is as follows: Figure 3 As shown, for example, when the frequency of the high-frequency wave is 1209HZ and the frequency of the low-frequency wave is 615HZ, the corresponding data is the letter E; when the frequency of the high-frequency wave is 1209HZ and the frequency of the low-frequency wave is 697HZ, the corresponding number is 1; and so on, the frequencies of the frequency waveforms corresponding to other letters and numbers are not repeated.

[0030] It should be noted that Figure 3 The shaded portion is data included in the traditional DTMF solution. Compared with the traditional DTMF solution, this embodiment performs data expansion.

[0031] The data encoding module is used to convert the received digital signal into an audio analog signal and transmit it to the mobile phone. After the data encoding module receives the data transmitted by the main control module, it converts the received digital signal into an audio analog signal and transmits it to the mobile phone. Figure 3 The corresponding relationship between the data and the frequency waveform is used to output a corresponding actual waveform, which is an audio analog signal.

[0032] Please refer to Figure 2The data encoding module includes a main control chip U2, which is communicatively connected to the main control module. The output port VOUT of the main control chip U2 outputs an audio analog signal, and the audio analog signal is transmitted to the audio interface after passing through the amplification unit and the filtering unit.

[0033] In this embodiment, the amplification unit includes an operational amplifier U24, the positive input end of the operational amplifier U24 is connected to a resistor R9 and a capacitor C37 in series, and the other end of the capacitor C37 is connected to the output port VOUT of the main control chip U2; the reverse input end of the operational amplifier U24 is grounded through a resistor R127, and the output end of the operational amplifier U24 is connected to the audio interface through a filtering unit; a resistor R126 is also connected between the reverse input end and the output end of the operational amplifier U24, and the positive input end of the operational amplifier U24 is also connected to a resistor R14, and the other end of the resistor R14 is connected to a resistor R128 and a capacitor C116 in parallel, the other end of the resistor R128 is connected to the reference voltage VREF, and the other end of the capacitor C116 is grounded.

[0034] In a specific embodiment, the filtering unit includes a resistor R122, a capacitor C113, and a capacitor C121. One end of the resistor R122 is connected to the output end of the operational amplifier U24, and the other end is connected to the capacitor C113 and the capacitor C121 in parallel. The other end of the capacitor C113 is grounded, and the other end of the capacitor C121 is connected to the audio interface.

[0035] Furthermore, an audio interface connects the phone to the data encoding and decoding modules, respectively, enabling data exchange via the phone's voice channel. The data decoding module converts received analog audio signals into digital signals and transmits them to the main control module. The data decoding process is the reverse of the data encoding process and will not be detailed here. The display screen is connected to the main control module, which drives the display to display the operating status of each module and transmitted data information.

[0036] Working principle: The point-to-point short message transmission device based on the audio channel is used at both ends of the cable, which is divided into a master transmission device and a slave transmission device. The two transmission devices are respectively connected to the external host and connected to the headphone interface of the mobile phone through the audio interface.

[0037] Dial the mobile phone of both parties. After answering, start the device and enter the connection attempt mode. If the connection is successful, "Connection Successful" will be displayed on the screen for 3 seconds, and the connection success icon will be displayed in the upper left corner of the screen. If the connection is unsuccessful, it will prompt "Connection Failed, Please Try Again". At this time, please check the connection.

[0038] After a successful connection, the display will show "Waiting for Data to be Sent" and the external interface will notify the peripheral host. The peripheral host can then enter the normal data transmission and reception process, and the data being sent and the sending progress can be seen on the display. The receiving end can also see the received content and progress on the display. After the communication is completed, hang up the phone and turn off the transmission device.

[0039] The data transmission process is as follows:

[0040] The main control module splits the data transmitted by the peripheral host into two corresponding frequency waveforms and generates corresponding data. The data encoding module produces the corresponding actual waveform according to the correspondence between the data and the frequency wave. The actual waveform is then processed by the amplification unit and the filtering unit. The processed waveform is transmitted to the mobile phone through the audio interface to realize data encoding. The signal is then sent to the other device through the voice network established by the mobile phone.

[0041] The data decoding module converts the analog audio signal transmitted from the mobile phone of the other device into a digital signal and transmits it to the main control module. The main control module then outputs it to the upper terminal to complete the data decoding. Through data encoding and decoding, point-to-point information transmission is achieved, completing data interaction.

[0042] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A point-to-point short message transmission device based on an audio channel, characterized in that: include: The main control module is used to split the data received from the upper terminal and transmit it to the data encoding module for encoding, and to integrate the decoded data received from the data decoding module and upload it to the upper terminal; The data encoding module is used to convert the received digital signal into an audio analog signal and transmit it to the mobile phone; The audio interface is used to connect the mobile phone to the data encoding module and the data decoding module respectively, and to perform data interaction through the voice channel of the mobile phone; The data decoding module is used to convert the received audio analog signal into a digital signal and transmit it to the main control module.

2. The point-to-point short message transmission device based on the audio channel according to claim 1 is characterized in that: It also includes a display screen, which is connected to the main control module. The main control module drives the display screen to display the operating status of each module and the transmitted data information.

3. The point-to-point short message transmission device based on the audio channel according to claim 1 is characterized in that: The main control module is used to split each character in the received upper terminal data into two corresponding frequency waveforms and generate data corresponding to the frequency waveforms. The frequency waveforms include high-frequency waves and low-frequency waves. The frequencies of the high-frequency waves include: 1209HZ, 1336HZ, 1477HZ, 1560HZ, 1633HZ, 1740HZ; the frequencies of the low-frequency waves include: 615HZ, 697HZ, 770HZ, 852HZ, 941HZ, 995HZ; the data includes letters AZ and numbers 0-9.

4. The point-to-point short message transmission device based on the audio channel according to claim 3 is characterized in that: After receiving the data transmitted by the main control module, the data encoding module outputs a corresponding actual waveform according to the corresponding relationship between the data and the frequency waveform.

5. The point-to-point short message transmission device based on the audio channel according to claim 1, characterized in that: The data encoding module includes a main control chip U2, which is communicatively connected to the main control module. The output port VOUT of the main control chip U2 outputs an audio analog signal, which is transmitted to the audio interface after passing through an amplifying unit and a filtering unit.

6. The point-to-point short message transmission device based on the audio channel according to claim 5, characterized in that: The amplification unit includes an operational amplifier U24, the positive input end of the operational amplifier U24 is connected to a resistor R9 and a capacitor C37 in series, and the other end of the capacitor C37 is connected to the output port VOUT of the main control chip U2; the negative input end of the operational amplifier U24 is grounded through a resistor R127, and the output end of the operational amplifier U24 is connected to the audio interface through a filtering unit; A resistor R126 is further connected between the inverting input and output ends of the operational amplifier U24. The positive input end of the operational amplifier U24 is further connected to a resistor R14. The other end of the resistor R14 is connected to a resistor R128 and a capacitor C116 in parallel. The other end of the resistor R128 is connected to a reference voltage VREF, and the other end of the capacitor C116 is grounded.

7. The point-to-point short message transmission device based on the audio channel according to claim 5, characterized in that: The filtering unit includes a resistor R122, a capacitor C113, and a capacitor C121. One end of the resistor R122 is connected to the output end of the operational amplifier U24, and the other end is connected to the capacitor C113 and the capacitor C121 in parallel. The other end of the capacitor C113 is grounded, and the other end of the capacitor C121 is connected to the audio interface.

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