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Sampling a continuous-time signal at a sampling period T to obtain a discrete-time signal

, then pass through an analog reconstruction filter with cutoff frequency , its output is a continuous time signal , then there must be （）

提问人：网友wu28wu28 发布时间：2022-01-07

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更多“Sampling a continuous-time sig…”相关的问题

第1题

Sampling a continuous-time signal at a sampling period T to obtain a discrete-time signal , then pass through an analog reconstruction filter with cutoff frequency , its output is a continuous time s

此题为判断题(对，错)。

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第2题

Which of the below statements is correrct, in terms of the sampling theory in the time domain?

A、The shorter the sampling interval, the better

B、The sampling frequency must be greater than or equal to the maximum freqeuncy times two

C、It is not neccesary that the sampled signal contains all the information of the continuous-time signal

D、Discretization in the time domain corresponds to periodization in the frequency domain

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第3题

Which of the following sampling methods correctly describes systematic sampling?

A．A sampling method which is a type of value-weighted selection in which sample size,selection and evaluation results in a conclusion in monetary amounts．

B．A sampling method which involves having a constant sampling interval, the starting point for testing is determined randomly．

C．A sampling method in which the auditor selects a block of contiguous items from within the population．

D．Testing items with a certain characteristiC．

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第4题

Which of the following statement about quota sampling and stratified sampling is/are true?

A．In both of them, there exist distinctive subgroups in the population.

B．They both need a sampling frame of each of the subgroups of the target population.

C．In both of them,researchers want to ensure that all strata are included in the sample in order to enhance the representativeness of the sample and/or to enable comparisons between strA

D．Stratified sampling does not need a sampling frame to generate a stratified sampl

E．

E．In both of them,once the sample number of each subgroup is defined,samples are drawn in simple random sampling or systematic sampling metho

D．

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第5题

1. With regard to the sampling, there were a limited number of students in the 15- to 18-year age range because fewer referrals of this age group were made to sleep centers and psychologists. There were a limited number of participants from the hospital samples who were diagnosed with ARC, DSPS, or RLS in this initial study, necessitating further validation studies with larger sample sizes. Furthermore, the recent changes in diagnostic criteria for OSAS and PLMD in children require further validation studies with larger sample sizes using these new hospital diagnostic criteria.

A、Revisiting previous sections or key results

B、Relating the study results to those of existing research

C、Specifying Achievements/Contributions & Implications

D、Identifying Limitations/ Suggesting Future work & Applications

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第6题

Among the three time study methods, ______ are (is) statistical based procedure(s).

A. work sampling and elemental time study methods

B. gross time study and work sampling methods

C. only elemental time study method

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第7题

______________ sampling is a form of probability sampling in which sampling units are divided into mutually exclusive and collectively exhaustive subpopulations.

A．Judgment sampling

B．Quota sampling

C．Simple random

D．Convenienc

E．Cluster

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第8题

Which one of the choices below is most correct regarding a cause of sampling risk?

A、ineffective use of audit procedures

B、testing less than the entire population

C、use of extensive tests of controls

D、use of random sampling