CN1137386C - Signal sampling method and signal detection display system - Google Patents

Signal sampling method and signal detection display system Download PDF

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Publication number
CN1137386C
CN1137386C CNB001244698A CN00124469A CN1137386C CN 1137386 C CN1137386 C CN 1137386C CN B001244698 A CNB001244698 A CN B001244698A CN 00124469 A CN00124469 A CN 00124469A CN 1137386 C CN1137386 C CN 1137386C
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signal
sampling
input
computing machine
measured
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CNB001244698A
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CN1281988A (en
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孙景琪
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Rigol Technologies Inc
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Abstract

The present invention discloses a signal sampling method and a signal detection display system, which belongs to the field of electronic measurement and automatic test instrument manufacture. The present invention is characterized in that the time interval of sampling points is nT +/-delta T (n can be 0, 1, 2, 3...), wherein T is a period of a measured signal, delta T = sT, 0 <s <1, and a sampling result is input to a computer for processing. The measurement and other processing to the high-frequency periodic signals can be realized by the method and a device by adopting the method.

Description

A kind of signal sampling method and input display system
Technical field
A kind of signal sampling method and input display system belong to electronic surveying and Automatic Test Equipment and make the field.
Background technology
In data acquisition system (DAS), signal is carried out the measurement of time domain or frequency domain, mainly use A/D (analog to digital conversion) technology.According to a kind of apple Qwest sampling thheorem, one-period the signals sampling frequency should be greater than the twice of this signal highest frequency, and in fact, sample frequency will reach 10 to 20 times of signal frequency at least, just can provide enough signal detail.Therefore, when measuring high-frequency signal, harsh requirement has been proposed A/D, sometimes, or even impossible.In order to address the above problem, adopt the high as far as possible signal of low speed A/D survey frequency, the multiple method of sampling was once proposed, two kinds of equivalent time sampling technology commonly used, i.e. Δ T method and stochastic sampling method.Δ T method is: to the sampling of N of periodic signal point is to have postponed to carry out after time of N Δ T with respect to trigger event, and the data of each sampled point are stored in the storer successively, as:
The 1st sampled point is to be benchmark with the triggering level, postpones Δ T post-sampling, and data are stored in storer;
The 2nd sampled point is to be benchmark with the triggering level, postpones 2 Δ T post-samplings, and data are stored in storer;
…………
The n sampled point is to be benchmark with the triggering level, postpones n Δ T post-sampling, and data are stored in storer.
When the restoring signal waveform, can from storer, access each sampling point value output successively and show.The difficulty of this method is to provide an accurate timing system, and will produce extremely short time delay Δ T.The stochastic sampling method is: each group sampled point is to sample constantly at random, and is irrelevant with triggering, and this method of sampling difficulty in control is bigger, also is difficult for realization.
Summary of the invention
The object of the present invention is to provide a kind of under low sampling rate condition, the method for the periodic signal that survey frequency is high as far as possible.
The method that the present invention adopts, a kind of signal sampling method is characterized in that: comprise step:
(1) measure the period T of measured signal according to the method for routine measurement signal period,
(2) according to period T, according to formula nT ± Δ T, wherein, n is an integer, Δ T=sT, and 0＜s＜1,
The time interval of calculating sampling point,
(3) according to the time interval of the sampled point that calculates, measured signal is adopted according to conventional method
Sample, and the data of storing each sampled point.
Utilize the input display device of this method, by the measured frequency unit, the A/D unit, memory buffer, sampling signal generator, computing machine constitutes, wherein, the input termination measured signal of measured frequency unit, output termination computing machine, the input termination measured signal of A/D unit, output termination memory buffer, the output termination computing machine of memory buffer, control termination computing machine, the input termination computing machine of sampling signal generator, output terminal wherein, is exported control signal by computing machine to sampling signal generator with the sampled signal input A/D unit of its generation, making its generation cycle is the sampled signal of nT ± Δ T, wherein, n is an integer, and T is the cycle of measured signal, Δ T=sT, 0＜s＜1.This device also can include a signal input part and connect that measured signal, control end link to each other with computing machine, output terminal connects the measured frequency unit respectively and the input attenuator and the amplifier of A/D unit, and input end connects the output pad and the amplifier of sampling signal generator and computing machine respectively.
In the input display device of the present invention, measured signal 9 is 2 input computing machines 4 through the measured frequency unit, measure the frequency of signal, obtain the measured signal period T, computing machine is according to the n value of T and setting, obtain nT, calculate Δ T by computing machine again, can calculate the sampling period (sample frequency) by nT ± Δ T formula, send instruction then and give sampling signal generator 5, produce sampling pulse, A/D is controlled, realization is to the sampling of measured signal 9, and the signal after the sampling deposits memory buffer 7 in, calls in that computing machine is handled and display result again.
Utilize this method and system, can use the high as far as possible periodic signal of low speed A/D frequency acquisition.
Description of drawings
For further describing the present invention in conjunction with the embodiments, show used description of drawings is as follows:
Accompanying drawing 1: the block diagram of system.
Accompanying drawing 2: the composition frame chart of input and display device.
Accompanying drawing 3: signal sampling processing procedure.
Embodiment
See Fig. 1,2,3.Measured signal 9 behind measured frequency unit 2 and computing machine 4, obtains signal period T behind input attenuator and amplifier 1, computing machine 4 is according to T value calculating sampling Δ interval time T, sampling period nT ± Δ T, sample frequency f H, sending the control signal of nT ± Δ T then to sampling signal generator 5, control sampling signal generator 5 makes its generation and provides accurate sampled signal to A/D unit 6.Sample to the output signal of input attenuator and amplifier 1 according to the gating pulse that sampling signal generator 5 provides in A/D unit 6, and deposit the data of each sampled point in memory buffer 7, computing machine 4 is sense data from buffering storer 7 successively, and carry out necessary processing, send display to recover the waveform of measured signal 9 then.
See Fig. 2, the signal that sampling signal generator 5 produces can output to output pad and amplifier 8, and the needed signal 10 of generation under the control of computing machine 4 makes it become that amplitude is controlled, the signal source of frequency adjustable.
Computing machine 4 also can carry out mathematics manipulation to the data after the sampling, obtains frequency domain characteristic and other required parameters of measured signal.
When measuring object was periodic signal, the position of initial sampled point can be set arbitrarily.Use this method to realize using the purpose of the high as far as possible periodic signal of low speed A/D frequency acquisition, greatly reduce the detection cost, and can realize the frequency detecting of high frequency periodic signal and the output of signal.

Claims (3)

1, a kind of signal sampling method is characterized in that: may further comprise the steps:
(1) measure the period T of measured signal according to the method for routine measurement signal period,
(2) according to period T, according to formula nT ± Δ T, wherein, n is an integer, Δ T=sT, and 0＜s＜1, the time interval of calculating sampling point,
(3) according to the time interval of the sampled point that calculates, according to conventional method measured signal is sampled, and store the data of each sampled point.
2, a kind of input display device that is realized according to the described signal sampling method of claim 1, it is characterized in that: this device is by measured frequency unit (2), A/D unit (6), memory buffer (7), sampling signal generator (5), computing machine (4) constitutes, wherein, the input termination measured signal (9) of measured frequency unit (2), output terminal and control termination computing machine (4), the input termination measured signal (9) of A/D unit (6), output termination memory buffer (7), control termination computing machine (4), the output terminal of memory buffer (7) and control termination computing machine (4), the input termination computing machine (4) of sampling signal generator (5), output terminal is with the sampled signal input A/D unit (6) of its generation, wherein, the cycle of being measured measured signal (9) by measured frequency unit (2) is T, is input to computing machine (4), exports control signal by computing machine (4) to sampling signal generator (5) again, making its generation cycle is the sampled signal of nT ± Δ T, and wherein n is an integer.
3, a kind of input display device that is realized according to the described signal sampling method of claim 2, it is characterized in that: this device also includes an input attenuator and amplifier (1), output pad and amplifier (8), wherein the signal input part of input attenuator and amplifier (1) connects measured signal (9), control end links to each other with computing machine (4), output terminal connects measured frequency unit (2) and A/D unit (6) respectively, and the input end of output pad and amplifier (8) connects sampling signal generator (5) and computing machine (4) respectively.
CNB001244698A 2000-09-08 2000-09-08 Signal sampling method and signal detection display system Expired - Fee Related CN1137386C (en)

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Application Number Priority Date Filing Date Title
CNB001244698A CN1137386C (en) 2000-09-08 2000-09-08 Signal sampling method and signal detection display system

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CN1137386C true CN1137386C (en) 2004-02-04

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102098051A (en) * 2010-12-31 2011-06-15 余成 Method and system for sampling high-frequency periodic signals

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104407190B (en) * 2014-11-26 2017-02-01 电子科技大学 Fully-digital random sampling method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102098051A (en) * 2010-12-31 2011-06-15 余成 Method and system for sampling high-frequency periodic signals
CN102098051B (en) * 2010-12-31 2013-09-04 余成 Method and system for sampling high-frequency periodic signals

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