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High-speed modem

A modem, high-speed technology, applied in the direction of distribution line transmission system, etc., to achieve the effect of enhancing anti-interference ability and improving reliability

Inactive Publication Date: 2011-02-09
上海益奥自控设备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a high-speed modem that can fully meet the current and future information transmission requirements of electric power automation in order to overcome the defect that the existing low-efficiency transmission modem cannot meet the information transmission requirements

Method used

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Embodiment Construction

[0011] A preferred embodiment will be given below, and the present invention will be described more clearly and completely in conjunction with the accompanying drawings.

[0012] The high-speed modem of the present invention adopts QAM (Quadrature Amplitude Modulation, quadrature amplitude modulation) technology, and QAM technology uses two modulated signals to carry out amplitude modulation to two carrier waves identical in frequency, phase quadrature exactly, then adds the modulated signal together and carries out Transmission or emission is a modulation method with high spectrum utilization. It has been widely used in medium and large capacity digital microwave communication systems, high-speed data transmission of cable television networks, satellite communication systems and other fields. When forming a chrominance signal in the NTSC (color television broadcasting standard formulated by the National Television Development Committee of the United States) system and the PAL...

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Abstract

The invention relates to a high-speed modem which comprises a setting switch, a microprocessor, a serial drive module, an FSK modulation module, a QAM (Quadrature Amplitude Modulation) module, an FSK (Frequency Shift Keying) demodulation module, a QAM demodulation module, a sending filtering equalizer, a receiving filtering equalizer, a gain amplifier, a power output operational amplifier, an input operational amplifier and a power amplifier, wherein the microprocessor comprises an I / O interface and a data register; the setting switch and the serial drive module are connected with the I / O interface; the FSK modulation module, the QAM module, the FSK demodulation module and the QAM demodulation module are connected with the microprocessor; the sending filtering equalizer is connected with the FSK modulation module and the QAM module; the sending filtering equalizer, the gain amplifier, the power output operational amplifier are sequentially connected; the receiving filtering equalizer is connected with the FSK modulation module and the QAM module; and the receiving filtering equalizer, the input operational amplifier and the power amplifier are sequentially connected. The invention meets the requirement for power automatic information transmission.

Description

technical field [0001] The invention relates to a modem, in particular to a high-speed modem. Background technique [0002] In the past, due to technical and economic reasons, most areas of my country's power system used power line carrier as the main means of communication. The entire audio frequency bandwidth of the multiplexing power line carrier machine is 300Hz ~ 3400Hz (≤ 4k Hz). In order to use the upper audio of the carrier machine to transmit data information, a modem is used. The basic function of the modem is to convert between the binary digital signal provided by the computer and the analog signal of the audio channel for long-distance data communication. Terminal equipment Connect with a remote host. The core of modulation and demodulation technology is how to increase the transmission speed of digital information in the voice channel with limited bandwidth (≤4KHz). )to measure. The modem used in the telecontrol analog channel in the power system adopts a s...

Claims

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Application Information

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IPC IPC(8): H04B3/54
Inventor 浦子耿
Owner 上海益奥自控设备有限公司
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