A Frequency Codec Communication System Based on Serial Port Device

Abstract

The present invention provides a frequency codec communication system based on a serial port device, which includes a serial port device and a frequency codec device. The serial port device is used to send the high four bits and The index byte data corresponding to the lower four bits in the first index table; the frequency codec device is used to decode the received time width as the bit width level of the serial port device into Bit 1, decode the received level whose time width is twice the bit width of the serial port device into bit 0, and match the bit string data obtained after the data reception is completed using the second index table, and obtain Two nibbles of data are concatenated to obtain one byte of data. While ensuring the communication, the present invention makes the signal of the serial port device have only two kinds of frequencies during communication, and enables the serial port to communicate with other communication devices in the manner of frequency coding, thereby expanding the application range.

Description

technical field [0001] The invention relates to a frequency coding and decoding communication system based on a serial port device. Background technique [0002] The serial port device is a design of amplitude encoding. The data bit and parity bit are low level to indicate bit 0, and high level to indicate bit 1. It also includes a start bit (low level) and a stop bit (high level). . When the data is uncertain, there may be multiple consecutive 0 bits or multiple consecutive 1 bits, which will result in multiple frequencies in the encoded signal. In some applications, the frequency has a certain range limit, such as: audio The optimal frequency range for communication is 1.2kHz to 3.4KHz, which results in the serial port device not being able to communicate with other communication devices through frequency coding, which is limited in these applications. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a frequen...

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a frequency codec communication system based on a serial port device to solve the problem that the existing serial port signals have multiple frequencies