Quiz Answers.docx

Quiz Answers.docx

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QuizAnswers

Chapter1QuizAnswers

1.definedatdiscreteamplitudesonly

2.modem

3.acquiringtheamplitudeofananalogsignal

4.choosesalegalamplitudeforananalogsample

5.analogtodigital

6.D/Aconversion

7.sampleandhold

8.blockshighfrequencyinformationandpasseslowfrequencyinformation

9.smoothessharpchanges

10.thefrequenciespassedbyoneareblockedbytheother

11.aliasingoccurs

12.toacquireananalogsample

13.holdsananaloglevelsteadyforonesamplingperiod

14.oneshowshowasignalchangeswithtimeandtheothershowsthesignal'sfrequencycontent

15.spectrum

16.areintegermultiplesofafundamentalfrequency

17.100Hz

18.2kHz

19.500Hz

20.abandstopfilterwithcut-offfrequenciesat3.5and4.5kHz

Chapter2QuizAnswers

1.samplingfrequencyisthesameassamplingrate

2.theNyquistrateistwicetheNyquistfrequency

3.30Hz

4.toremovefrequenciesabovehalfthesamplingrate

5.250and350Hz

6.300,500,1100,1300Hz

7.ananti-imagingfilter

8.undersamplingoccurs

9.givesthefilterasteeperroll-off

10.24kHz

11.19.5mV

12.getssmallerasthefullscaleanalograngegetssmaller

13.alimitednumberofbits

14.howwelltheconvertercandistinguishsmallandlargesignals

15.theypermitawiderangeofnumberstobepresentedatonce

16.signaltonoiseratio

17.6bits

18.2.5V

19.alloftheabove

20.convertingdigitalcodestoproportionalanaloglevels

Chapter3QuizAnswers

1.shiftedrightby2

2.dropseveryothersample

3.x[n+3]

4.x[4n]

5.0

6.2

7.1

8.-1

9.4

10.5u[3-n]

11.4.388+j2.397

12.2π/7

13.noneoftheabove

14.8samplesperdigitalperiod,collectedover3analogcycles

15.shiftedleftby3

16.0.994

17.isoneof2Nshadesofgray

18.alloftheabove

19.345600bits

20.24

Chapter4QuizAnswers

1.anamplificationfactor

2.passband

3.attenuatessignals

4.delimitedbycut-offfrequencies

5.bandpassfilter

6.alloftheabove

7.softwarefortheDSP

8.obeyssuperposition

9.filterbehaviordoesnotchangewithtime

10.causal

11.y[n]=-0.2y[n-1]+0.3y[n-2]+x[n]+0.5x[n-1]

12.itreliesonpastinputsandpastoutputs

13.bothrecursive

14.resultfromlimitednumbersofbits

15.w[n]=x[n]+0.25w[n-1];y[n]=w[n]+0.2w[n-1]

16.1,-1.3,1.04,-0.832

17.infiniteimpulseresponse

18.hasafiniteimpulseresponse

19.（x[n]+x[n-1]+x[n-2]+x[n-3]）/4

20.0.5,0.5,0.25,0.35

Chapter5QuizAnswers

1.x[n]=2.00δ[n]+1.62δ[n-1]+1.30δ[n-2]

2.mathematicallycombinesaninputandanimpulseresponse

3.alloftheabove

4.1.41

5.-4,6,12,-8,-8,2,0

6.22samples

7.noneoftheabove

8.8samples

9.18

10.infinite

11.y[n]=x[n]+0.4x[n-1]+0.16x[n-2]

12.h[n]=（-0.7）nu[n]

13.0.8

14.movingaverage

15.smoothesaninputsignal

16.3.3,5.7,7.0,4.0

17.5-termmovingaveragefilter

18.mediumandlightgrayverticalstripes

19.blurstheimage

20.126x266

Chapter6QuizAnswers

1.frequencydomain

2.whereaztransformexists

3.z/（z-0.5）

4.|z|>0.2

5.0.78z/（z2-0.356z+0.64）

6.（4z3+6）/（z7（z-1））

7.H（z）=z2/（z3+0.4z2+z+0.4）

8.y[n]=x[n]-0.2x[n-1]+0.3x[n-2]

9.H（z）=（1-0.7z-2）/（1-0.3z-1）

10.noneoftheabove

11.h[n]=（-0.4）nu[n]

12.H（z）=1/（1-0.6z-1-0.16z-2）

13.5nu[n]

14.1-z-3+z-6-z-9+...

15.y[n]=0.625（1-（0.2）n-1）u[n-1]

16.poles:

-0.2+j0.245,-0.2-j0.245;zeros:

0,-0.2

17.stable

18.5

19.thelongerthesettlingtime

20.Csettlesthefastest

Chapter7QuizAnswers

1.frequencyresponse

2.repeatsevery2πradians

3.X（Ω）=1+0.8187e-jΩ+0.6703e-j2Ω

4.H（Ω）=（1+e-jΩ）/（1+0.3e-jΩ）

5.H（Ω）=1-0.2e-j2Ω+0.5e-j3Ω

6.noneoftheabove

7.H（Ω）=1.5e-jΩ+3e-j2Ω

8.y[n]=2.8cos（n2π/5+π/4）

9.y[n]=10cos（4n+1.85）

10.alloftheabove

11.odd

12.bandwidth

13.1.6kHz

14.combfilter

15.1528Hz

16.573and1337Hz

17.lowpassandwideband

18.bandpass

19.bandstop

20.A

Chapter8QuizAnswers

1.frequencycharacteristics

2.whitenoise

3.noneoftheabove

4.discretetimeFouriertransform

5.6317Hz

6.7480Hz

7.anon-periodicsignalhasacontinuousspectrum

8.7

9.discreteFourierseries

10.repeatevery24samples

11.360Hz

12.7.2kHz

13.2000Hz

14.alloftheabove

15.twospikes

16.56

17.fourpeaks

18.571.4Hz,1000Hz,3000Hzand3428.6Hz

19.0,4,5,11,12

20.0,-π/2,0

Chapter9QuizAnswers

1.alloftheabove

2.π/9radians

3.somefrequenciestakelongerthanotherstomovethroughafilter

4.doesnotdisplayphasedistortion

5.thephasebutnotthemagnituderesponseofthefilter

6.infiniteandnon-causal

7.filtershapetodegradefromtheideal

8.thedistanceinHzbetweenpassandstopbandedgesforanyfilter

9.δp

10.themaximumgaininthestopband

11.Blackman,Hamming,rectangular

12.causedbysharpsignaltransitions

13.tomakethenumberoftermsintheimpulseresponsefinite

14.thesmallerthetransitionwidth

15.Hanningwindowwith11terms

16.Hammingwindowwith83terms

17.shiftsthespectrumtothelocationofthespike

18.itspassbandedgeat250Hzandanunknowntransitionwidth

19.connectingalowpassfilterandahighpassfilterinparallel

20.alloftheabove

Chapter10QuizAnswers

1.noneoftheabove

2.requirefewercoefficients

3.theChebyshevTypeIfilterhasripplinginthepassband

4.elliptic

5.undodistortioncausedbythebilineartransformation

6.pointsinthelefthalfofthesplane

7.4368Hz

8.1657/（s+1657）

9.0.091（1+z-1）/（1-0.455z-1）

10.thesteepertheroll-off

11.4

12.17

13.7

14.9

15.h[n]=2e-0.01n

16.highpass

17.bandstop

18.y[n]=0.765y[n-1]-y[n-2]+0.924x[n-1]

19.333Hz

20.[0.50.3750.25]

Chapter11QuizAnswers

1.selectsthetimesamplestobeanalyzed

2.periodicwithperiodN

3.theDFTsamplestheDTFT

4.theyareidentical

5.0,0.049,0.098,0.147

6.0.15,0.0168,0.4082,0.4082,0.0168

7.21.5Hz

8.7968.75Hz

9.[3j1.73-j1.73]

10.225Hz

11.91

12.64-pointDFT

13.windowintimedomain,computespectrum,sampleinfrequencydomain

14.64msec

15.mustbeminimizedtoobtainaccurateDFTresults

16.acollectionofDFTmagnitudespectra

17.regularly-spacedhorizontallines

18.multipliersintheFFT

19.acombinationofevenandoddFFTs

20.1/60asmanycalculations

Chapter12QuizAnswers

1.Harvardarchitecture

2.alloftheabove

3.aplacetostoreanumber

4.holdsdatamostlikelytobeneeded

5.permitsseveralinstructionstoexecuteatonce

6.0.125

7.0xFED4

8.32842

9.-24575

10.0.87890625

11.-0.453125

12.0x428F

13.0xD1EC

14.1.0742187x10-5

15.twoverynegativenumbersareadded

16.0100101011

17.theproductoftwonumbersisdoublethewidthofeithernumber,andthesummaycauseoverflow

18.0xEC11

19.themoreaccuratelynumberscanberepresented

20.31.25nsec

Chapter13QuizAnswers

1.16-bitfixedpointdevice

2.30MIPS

3.24bitswide

4.0x8000and0x7FFF

5.0x02AB

6.0xFE21

7.0x7852

8.0x0785

9.1.4x10-3

10.2.5x10-3

11.y[n]=0.625x[n]+0.269989013671875x[n-1]+0.1724853515625x[n-2]

12.y[n]=0.8125w[n]-0.4375w[n-1]+0.149993896484375w[n-2]

13.1.5x10-5

14.i0

15.twosignednumbersaremultiplied

16.readsavaluefromprogrammemoryintoaregister

17.0x1788

18.0xF788

19.ar=1

20.assemblyandlinking

Chapter14QuizAnswers

1.theeliminationofsamplestoreducethesamplingrate

2.theuseofmorethanonesamplingrate

3.alloftheabove

4.effectivelyincreasesthesamplingrate

5.tocapturesignalssmallerthanhalfaquantizationstep

6.reducestheeffectivesizeofthequantizationstepforsmallsignals

7.quantizesto13bits,thencompandsto8bits

8.1.41Mbps

9.128kbps

10.adjustthebitratefromonemomenttothenext

11.thesmallestspeechsounds

12.matchesthelengthsofanutteranceandatemplate

13.constructsmusicalsoundsfromshortrecordings

14.15.4

15.modelsthehumanspeechapparatus

16.arehighpointsinsubsealayers

17.0.29

18.asymmetrickeyencryptionscheme

19.oscillates

20.proportionalintegralderivative

Chapter15QuizAnswers

1.alloftheabove

2.0to255

3.21

4.0.283m2

5.morphing

6.colorblending

7.theblurriertheimage

8.asinglepixelofastronglycontrastingcolor

9.strengthenstheedgesintheimage

10.4squareunits

11.rectangular

12.circle

13.alloftheabove

14.asincenvelopealongoneofitsrows

15.phasespectrum

16.creates3Dmodelsfrom2Dinformation

17.destroyssomeoftheinformationinthefile

18.25:

1

19.assignshortcodestothemostcommonsamples

20.alloftheabove

Chapter16QuizAnswers

1.alloftheabove

2.inverselyproportionaltofrequency

3.thetimesfrequenciesoccurinasignal

4.thelengthoftimeoverwhichitisdefined

5.twohorizontalbands

6.scalingfunctions

7.s=0.5,0.25,0.125,0.0625

8.0,0.25,0.5,0.75seconds

9.23/2ϕ（8t-2）

10.2to3.5seconds

11.scalingfunctionsandwaveletfunctions

12.smallscalewavelets

13.expressesafunctionintermsofascaled-downcopyofitself

14.1024DWTcoefficients

15.alloftheabove

16.c0d0d1

17.alowpassapproximationandhorizontal,vertical,anddiagonaldetails

18.goodfrequencyresolutionatlowfrequencyandgoodtimeresolutionathighfrequency

19.zerosallDWTcoefficients

20.itdoesnotshowblockingeffects