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Manchester code decoding method and application apparatus therefor

A decoding method and encoding technology, applied in the field of Manchester encoding decoding method and application device, can solve problems such as troublesome decoding process, increase circuit, shorten battery life, etc., achieve cost and reliability, increase communication distance, reduce product cost cost effect

Inactive Publication Date: 2006-11-22
宁波中科集成电路设计中心有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, since the transmission power of civil wireless products is limited, and since the sensor modules in the automobile tire pressure monitoring system are all powered by batteries, increasing the transmission power will undoubtedly greatly shorten the service life of the battery, so this method is not possible. taken
[0005] Improving the receiving sensitivity is a feasible solution, but the shortcoming of the current method is that some circuits need to be added, which increases the product cost
However, since the receiving chip still has clutter output when there is no data reception, this brings great problems to data decoding. If pure data sampling decoding is used, it will affect the keyboard, LCD display and sound of the tire pressure monitoring system. Light alarm and other processing devices; and the use of interrupt decoding, because the single-chip microcomputer can only respond to one interrupt, it will also bring trouble to the decoding process, so the two decoding methods currently used for Manchester encoding have defects

Method used

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  • Manchester code decoding method and application apparatus therefor
  • Manchester code decoding method and application apparatus therefor
  • Manchester code decoding method and application apparatus therefor

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Embodiment Construction

[0019] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0020] preamble

sync code

Data 1

……

data n

CRC8 checksum

code

[0021] In order to cooperate with software decoding, the preamble is designed as two bytes of data: 0xFFh, 0xFEh.

[0022] First assume that the duration of Manchester encoded data "0" and "1" is T1, and the error time of the data waveform is ±t1, then the duration of each reliable data "0" or "1" waveform is t2: (T1-t1 )<=t2<=(T1+t1).

[0023] It can be obtained from t2 that the longest duration of each data waveform is t3, t3=(T1+t1); the shortest time is t4, t4=(T1-t1).

[0024] Manchester coded "1" is defined as a falling edge The corresponding "0" is defined as a rising edge

[0025] Two special processing methods are used in specific decoding.

[0026] 1. For the preamble. Set the preamble to the two bytes of ...

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Abstract

The disclosed decoding method for Manchester code comprises: the first SCM organizes the data into a data frame with the lead code, the synchronization code and check code; before decoding, the second SCM decodes the lead code wirelessly before the synchronization code by means of interrupt method and then decides whether the lead code right; if yes, the second SCM samples the data port, or continues to monitor and receive signal combined a timing technique or else continues to monitor signal. This invention improves sensitivity and validation, reduces cost, and has wide application.

Description

technical field [0001] The present invention relates to a coding decoding method, in particular to a Manchester coding decoding method and an application device. Background technique [0002] The existing Manchester code is widely used in various low-speed communication devices, such as in the widely used automobile tire pressure monitoring system, through the sensors installed in each tire, the physical quantities such as tire air pressure and temperature can be accurately measured, and The information is wirelessly transmitted to the tire pressure monitoring system receiver installed in the cab, so that the driver can keep track of the pressure and temperature of the tires at any time, and alarm when the tire pressure and temperature are abnormal, prompting the driver Solve tire failures in time, eliminate hidden dangers of accidents, and ensure driving safety. [0003] The automobile tire pressure monitoring system transmits the data detected by the tire sensor in a wire...

Claims

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Application Information

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IPC IPC(8): G08C17/02H04L25/49
Inventor 黄菲胡仕伟
Owner 宁波中科集成电路设计中心有限公司
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