Frame header detection device and method
A detection method and technology of a detection device are applied in the field of card readers, which can solve the problems of inability to meet the requirements of card reading reliability, frame header error detection, etc., so as to reduce the possibility of frame header misjudgment, improve reliability, and satisfy reading Effects of Card Reliability Requirements
Inactive Publication Date: 2015-07-01
KTMICRO ELECTRONICS
View PDF4 Cites 2 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0004] However, in the high-performance non-contact TYPE A smart card reader, the reliability of card reading is very high, and when the envelope signal is affected by noise, this method of relying on the threshold value to detect the frame header is easy to cause Error detection of the frame header, so it cannot meet the reliability requirements of the high-performance non-contact TYPE A smart card reader for card reading
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0027] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0028] Such as image 3 As shown, it is a schematic structural diagram of the first embodiment of the frame header detection device of the present invention, the device can be used for the receiving circuit of the non-contact TYPE A smart card reader, and the detailed structure of the receiving circuit of the TYPE A smart card reader see figure 1 As shown in the structural diagram, the data frame input to the frame header detection device is the combined signal MFIQ. The device may include an acquisition module 31 and a judgment module 32 .
[0029] Wherein, the acquiring module 31 is configured to acquire the maximum value of the input data frame within one symbol period and the first time point when the maximum value occurs. The judging module 32 is used to obtain the change degree of the value of the data frame in the symbol period from t...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention relates to a frame header detection device and a frame header detection method. The frame header detection method is used for receiving circuits of a contactless TYPE A type intelligent card reader-writer. The frame header detection method includes: obtaining a maximum value of an input data frame in a symbol period and a first time point corresponding to the maximum value, obtaining change degree of a value of the input data frame in the symbol period relative to the maximum value from the first timing point, and judging whether detecting a frame header according to the change degree. The frame header detection device is used for the receiving circuits of the contactless TYPE A type intelligent card reader-writer. The frame header detection device comprises an acquisition module and a judgment module, wherein the acquisition module is used for obtaining the maximum value of the input data frame in the symbol period and the first time point corresponding to the maximum value, and the judgment module is used for obtaining the change degree of the value of the input data frame in the symbol period relative to the maximum value from the first timing point, and judging whether detecting the frame header according to the change degree. The frame header detection device and the frame header detection method can improve detection reliability of the frame header.
Description
technical field [0001] The invention relates to the field of card readers, in particular to a frame header detection device and method. Background technique [0002] In the ISO / IEC 14443 protocol, the data transmission method between the contactless smart card and the reader is specified. According to the different ways of sending and receiving signals, the ISO / IEC 14443 protocol defines two card types, TYPE A and TYPE B. The difference between these two card types mainly lies in the modulation depth of the carrier wave and the encoding method of binary numbers. Among them, the TYPE A smart card transmits signals to the smart card through the 13.56MHz carrier wave on the reader, adopts the synchronous and improved Miller encoding method, and transmits through 100% ASK; when the TYPE A smart card transmits signals to the reader, use The 848KHz subcarrier transmits Manchester code. Specifically, when the TYPE A smart card transmits a data frame to the reader, the frame heade...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): G06K7/00
Inventor 李振郭爱香李坤李旭芳杨培
Owner KTMICRO ELECTRONICS