Singlechip-based MDAC narrowband tracking filter and realizing method thereof

Abstract

The invention discloses a singlechip-based MDAC narrowband tracking filter and a realizing method thereof. The filter comprises a first multiplying digital-to-analog converter, a second multiplying digital-to-analog converter, a first low pass filter connected with the first multiplying digital-to-analog converter, a second low pass filter connected with the second multiplying digital-to-analog converter, and a singlechip connected with input ends of the first and second multiplying digital-to-analog converters. The realizing method comprises the following steps: receiving a basic pulse signal in common frequency with rotating speed; respectively outputting the signal after processing which comprises of receiving a pulse sequence of the basic pulse signal and responding external once and interrupting in each basic pulse cycle; timing the basic pulse signal to acquire cycle time; and respectively outputting a sinusoidal waveform and a cosine waveform by a 8-bit numbers mode in one cycle time. The filter and the method have simple hardware structure, and realize signal generation by sufficiently utilizing the singlechip to ensure that the production cost and manufacture cost are greatly reduced.

Description

technical field [0001] The invention relates to a filter and a realization method thereof, in particular to a single-chip microcomputer-based MDAC narrow-band tracking filter and a realization method thereof. Background technique [0002] Unbalance is the main cause of noise and failure of rotating machinery, and to eliminate rotor unbalance, the unbalance of rotating machinery must be measured first. The measurement of unbalance is mainly realized by detecting the vibration signal of the rotating shaft (or bearing). [0003] The vibration response caused by the unbalance is a signal with the same frequency as the rotor speed, but the actual vibration signal obtained by the vibration sensor includes not only the same frequency signal, but also the vibration caused by the influence of the rotor, bearing, basic structure and its environment. generated noise signal. For this reason, the method of filtering must be used to extract the vibration signal caused by the unbalanced ...

AI Technical Summary

Problems solved by technology

[0007] The advantage of the EPROM-based MDAC narrow-band tracking filter is that it overcomes the shortcomings of the wattmeter and the switched capacitor filter, and has good measurement accuracy. Counter 3' and EPROM sine and cosine function generators 4' and 5' are used to generate sine and cosine functions, the hardware is more complicated and the cost is high

In addition, due to the use of hardware, it is inconvenient to modify the circuit design.

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