A lossless compression method for continuously collecting signals by a physiological sign sensor
A technology of signal acquisition and lossless compression, applied in electrical components, code conversion, etc., can solve problems such as loss of original information, achieve low computational complexity, reduce communication power consumption, ensure rationality and use value
Active Publication Date: 2017-07-04
TIANJIN ONEHAL INFORMATION TECH
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AI Technical Summary
Problems solved by technology
Although lossy compression has a high compression rate, it will lose part of the original information
Method used
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Experimental program
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Effect test
Embodiment 1
[0046] 1. The voltage range output by the pulse sensor is 200mV, and the output frequency is 500 times per second. After the amplification circuit and A / D conversion, the range of pulse output value [S m , S n ] is [0, 4096]. The signal processing device adopts a microprocessor based on 32-bit ARM Cortex M0 core architecture, the operating frequency is 50MHz, it has 256KB of Flash space and 64KB of internal RAM, and is equipped with 4MB of additional Flash.
[0047] 2. The fixed time interval T of the acquisition device for signal acquisition is 2 milliseconds, and the output voltage of the pulse sensor is obtained every 2 milliseconds, and the signal is amplified and A / D converted, and temporarily stored in sequence. Each temporarily stored physiological sign signal is stored in 2 bytes to accommodate the value range [S m , S n ] range of expression.
[0048] 3. The data processing unit compresses the temporarily stored original data every 60 seconds and transmits it to t...
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The invention discloses a lossless compression method for signals continuously collected by a physical sign sensor, and belongs to the technical field of lossless compression. The lossless compression method is characterized by comprising the following steps that (1) sign signals S are continuously collected by the sensor at the fixed time interval T to form a signal time sequence; (2) after a signal processing unit accumulates n signal data, the first signal datum is used as the benchmark datum Db of the data in a current data package, and starting from the second signal datum, the difference values D of the data relative to the last data are calculated to form a difference value sequence; (3) the difference value sequence is replaced through the predefined encoding dictionary L; (4) the difference value sequence is encoded through the encoding dictionary L to form a compressed data sequence Lt+1Lt+2...Lt+n, and the compressed data sequence Lt+1Lt+2...Lt+n and the benchmark datum Db are stored together to build a compressed data package PLW. The lossless compression method for the signals continuously collected by the physical sign sensor is low in computation complexity, and small in occupation memory space, and is used for lossless compression of the sign signals.
Description
technical field [0001] The present invention relates to a data compression method, and more specifically, to a lossless compression method for continuously collecting signals of a physiological sign sensor. Background technique [0002] With the advancement of technology and the development of smaller sensors, body area networks composed of sign sensors and their devices can be used for telemedicine and long-term health identification technology for remote and long-term collection of physiological sign signals. This working mode is becoming more and more popular. more widely accepted. [0003] Sign sensors and the sign signals they collect usually have the following characteristics: [0004] 1. High-frequency acquisition. In order to meet the basic acquisition requirements of physical sign signals, the acquisition frequency of physiological signals such as pulse and ECG is usually above 100Hz. Meet the requirements of medical clinical use. [0005] 2. Wireless transmissio...
Claims
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IPC IPC(8): H03M7/30
Inventor 陈岩曹金平何国祥
Owner TIANJIN ONEHAL INFORMATION TECH