A telegraph keying signal processing system and method

Abstract

The invention discloses a telegraph keying signal processing system and method, belonging to the field of telegraph technology. The system includes computer, signal acquisition device and telegraph keying equipment. Described computer comprises: communication module, is used for parsing and obtains the data packet that represents the telegraph keying device button state of each road that described signal acquisition device collects; In one of the two states, the square wave of each key is output; the square wave correction module is used to eliminate the jitter of the key square wave and debounce; and the identification decoding module is used to identify the corrected square wave And obtain the code word represented by the key square wave; the display module displays each key square wave in the second buffer area and its corresponding code word on the display screen in real time. The invention better solves the relationship between the original signal and the correction number, and can comprehensively and accurately reflect the training situation of the students.

Description

technical field [0001] The invention relates to a telegraph keying signal processing system and method, belonging to the field of telegraph technology. Background technique [0002] Commonly used telegraph keying devices are divided into two types: hand keys and number keys. The hand keys are used to distinguish dots and strokes according to the length of the manual key press, while the number keys are automatically generated by the device according to the number pressed. interval. Hand keys are the simplest and most basic keying equipment, and hand key training is the main item in operator training. Telegraph keying equipment using hand keys in telegraph training often includes two states of "pressing the button" and "releasing" (or "lifting the key"), and its output is often a binary state of high and low levels. Usually represented by a square wave. The traditional telegraph trainer is an embedded device developed based on a single-chip microcomputer. Its data processi...

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Problems solved by technology

like figure 1 As shown, the usual hardware debounce is to use hardware circuit to filter the square wave less than a certain threshold width. The width of the square wave after debounce is smaller than the actual square wave width, but it is often only "instantaneous". Width loss, this method can also effectively eliminate the influence of "jitter", and it is also in line with the daily habit of listening to and copying, but there are situations where it cannot reflect the mistakes or irregularities in the operator's training process

[0003] In the traditional telegraph trainer, the recognition method based on the reference point of conventional decoding is often used. This method compares the square wave sequence of the collected button state with the pre-agreed reference point according to the rules of Morse code. , and then the square wave sequence realizes the division of dots and dashes, and then according to the combination of "dots" and "dashes", the corresponding codewords are obtained by looking up the table in the coding table. This traditional method has the problem of poor self-adaptive ability

In order to improve the self-adaptive ability, such as adopting the signal recognition method described in CN103414663.A "Adaptive Recognition Method of Morse Signal Based on Backtracking Method" for decoding, then there is a problem of not performing "debounce" processing on the signal. In some cases, it will affect the identification of the signal, and in severe cases it will lead to wrong decoding

Not only in the hand keys, but also in the keying equipment using digital keys, the interference of electrical signals or the circuit or program that generates dot and dash signals may also cause jitter, and there is also the problem of "debounce"

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