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Method for sampling multiple voltage analog signals

An analog signal and voltage technology, applied in the direction of electrical signal transmission system, signal transmission system, electrical components, etc., can solve the problems of increasing system cost, increasing cost, and low time accuracy, so as to save CPU time, reduce hardware design, and avoid The effect of time conflict

Active Publication Date: 2017-05-10
汉摩尼(江苏)光电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention adds a channel switch selection circuit and a signal conditioning circuit, which can automatically switch multiple analog input signals for analog-to-digital conversion. The timing problem of periodic sampling of voltage analog signals, the time accuracy is low
In the prior art, independent A / D converters can also be added to realize multi-channel signal sampling, but this will increase the cost of the system and make the A / D converter resources on the chip not be effectively utilized. Increase the complexity and area of ​​peripheral circuit design

Method used

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  • Method for sampling multiple voltage analog signals
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  • Method for sampling multiple voltage analog signals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] An example of a remote life monitoring system is used to illustrate that it includes two ADC sensor modules, an ECG module and a respiration module. The minimum sampling frequency of ECG is 200 Hz, and the minimum sampling frequency of respiration is 60 Hz per second, n=2.

[0044] For simplicity, take T=T'=0.0025s (the unit is s, which needs to be converted into timer counting; n takes 2, so C=0.005s), then the timer interrupt period can be taken as 0.0025s, and the ECG sampling period can be taken as 0.005s ( 200Hz, h=1), the respiration sampling period can be 0.01s (100Hz, h=2). After the system is started, the first ECG sampling is performed at the first interrupt of the timer, and the first ECG sampling is performed at the second interrupt of the timer. The first breath sampling, then the ECG sampling and breathing sampling will be performed according to their respective frequencies, and the following sequence will be generated

[0045]

[0046] Multi-channel sh...

Embodiment 2

[0051] Assume that the minimum sampling frequency of ECG is 200Hz (period less than 5ms);

[0052] The minimum breathing sampling frequency is 60Hz (period less than or equal to 16ms);

[0053] The other two signals, one of which S1 has a minimum sampling frequency of 120Hz (period less than or equal to 8ms);

[0054] Another signal, the minimum sampling frequency of S2 is 80Hz (period less than or equal to 12ms).

[0055] n=4, T=1ms, with C=4

[0056] ECG: T=4ms, h=1

[0057] Breathing: T=16ms, h=4

[0058] S1: T=8ms, h=2

[0059] S2: T=12ms, h=3

[0060] Therefore, according to this proposal, the sampling time of ECG, respiration, S1, S2 is planned as follows:

[0061]

[0062] That is, ECG is sampled at the 0th millisecond, breathing is sampled at the 1st millisecond, S1 is sampled at the 2nd millisecond, S2 is sampled at the 3rd millisecond, ECG is sampled at the 4th millisecond, ECG is sampled at the 8th millisecond, and S1 is sampled at the 10th millisecond. S1 s...

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Abstract

The invention discloses a method of sampling a plurality of voltage analog signals. By means of design of sampling frequency, frequency of a timer and sampling starting time, time conflict of sampling of a multi-channel analog to digital (A / D) converter is completely avoided, and high time accuracy is achieved.

Description

technical field [0001] The invention belongs to the field of signal sampling, and in particular relates to a method for sampling a plurality of voltage analog signals. Background technique [0002] In the data acquisition process of a multi-sensor medical system, it is sometimes necessary to sample multiple voltage analog signals. Many current MCU designs have on-chip A / D converters, which usually provide sampling for multiple A / D converter channels, but these A / D converter channels usually share one converter through a multiplexer, so only one converter can be used at the same time. Sample a channel. In occasions where multiple voltage analog signals need to be sampled periodically, it often interferes with the sampling, and the precision is low. Chinese patent (patent number CN200610109266.5) introduces a multi-channel analog-to-digital conversion device, including an analog signal input port, a control sampling circuit, and a channel switch selection circuit connected t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M1/54
Inventor 廖京生潘樱子刘元启沈昭刘立胡超彭忠宝孟庆虎
Owner 汉摩尼(江苏)光电科技有限公司