Signal sampling method, circuit and equipment

Abstract

The invention discloses a signal sampling method, a signal sampling circuit and signal sampling equipment. The signal sampling method comprises the following steps: pre-configuring a signal period T of a sampled signal and a sampling period Ts = T + delta t of a sampled signal; when the sampled signal is triggered to be generated according to the signal period, controlling the AD chip to sample the sampled signal according to the sampling period, and obtaining a sampling signal xsn = x (nT + n delta t) = x (n delta t); and according to the sampling signals [xs1, xs2, xs3,..., xsn] which are combined according to a time sequence, obtaining sampling signals taking delta t as a sampling interval. Thus, the method is based on the periodic change characteristic of the sampled signal; a signal sampled at the nT + n delta t moment can be equivalent to a signal sampled at the n delta t moment; therefore, the purpose of collecting the high-frequency signals through the low-frequency sampling signals is achieved through an equivalent sampling method, a high-frequency AD chip does not need to be used under the condition, a common low-frequency AD chip can meet the sampling requirement, and therefore the signal sampling cost is saved.

Description

technical field [0001] The invention relates to the field of signal sampling, in particular to a signal sampling method, circuit and equipment. Background technique [0002] At present, most signals in equipment are sampled, stored, analyzed and applied, including periodically changing analog signals. In the prior art, for a periodically changing analog signal, the signal sampling method usually uses an AD (Analog-to-digital, analog-digital) chip to sample the analog signal, and converts the analog signal into a digital signal for subsequent circuits. However, as the frequency of signals in the equipment becomes higher and higher, the sampling frequency requirements for these high-frequency signals are also higher and higher. Usually, the AD chip with a higher sampling frequency is used to meet the sampling requirements. However, the sampling frequency is relatively high. High AD chips are expensive, resulting in higher signal sampling costs. [0003] Therefore, how to pro...

AI Technical Summary

Problems solved by technology

However, as the frequency of signals in the equipment becomes higher and higher, the sampling frequency requirements for these high-frequency signals are also higher and higher. Usually, the AD chip with a higher sampling frequency is selected to meet the sampling requirements. However, the sampling frequency is relatively high. High AD chips are expensive, resulting in higher signal sampling costs

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