Data acquisition and storage system and method based on double sampling rates

Abstract

The invention discloses a data acquisition and storage system and method based on double sampling rates. A high-sampling-rate data stream is converted into low-sampling-rate data through a data extraction logic module, the high-sampling-rate data stream and the low-sampling-rate data stream are connected to a storage selection logic module at the same time, then one of the high-sampling-rate data stream and the low-sampling-rate data stream is selected through logical selection to be data to be stored and transmitted to a storage control logic module, and the storage control logic module stores the data to be stored in a data storage unit so that double-sampling-rate storage can be achieved. By the adoption of the system and method, high time resolution on concerned details can still be maintained on the basis that sampling time is prolonged as much as possible, and the contradiction between sampling time and sampling rate can be overcome; the high sampling rate and the low sampling rate can be set as needed, switching between the sampling rates is decided by a triggering condition set by a user, switching is conducted automatically, and the system is convenient to use.

Description

technical field [0001] The invention relates to the field of digital acquisition, in particular to a data acquisition and storage system and method based on double sampling rates. Background technique [0002] A data acquisition system usually consists of a front-end conditioning circuit, an analog / digital conversion circuit, a digital logic control circuit, and a data memory. The conditioning circuit is responsible for adjusting the input signal to the range suitable for the reception of the analog / digital circuit, the analog / digital circuit is responsible for digitizing the input analog signal, and the digital logic control circuit is responsible for receiving the digital signal output by the analog / digital circuit and controlling the data memory to convert these Signals are stored according to current system requirements. [0003] For the above-mentioned data acquisition system, sampling rate and data storage depth are very important indicators. The sampling rate refers...

AI Technical Summary

Problems solved by technology

The advantage of this storage method is that it is simple in structure, easy to implement, low in logic resource requirements, and low in storage bandwidth requirements, but its disadvantage is that since the storage space of the sampling system is fixed, if the system works at a high sampling rate, the storage space will be very fast. Overflow, the sampling time is short, but higher time resolution can be obtained. If working at a low sampling rate, although the stored sampling time is extended, due to the reduced sampling rate, some abnormal waveforms that you want to observe cannot be obtained. details at (due to sampling rate constraints)

In short, due to the limitation of the storage depth of the acquisition system, there is a contradictory relationship between the sampling time and the sampling rate for the traditional constant sampling rate data storage method, and the two cannot be improved at the same time.

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