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CTS-D > export_dsp terms > Flashcards

export_dsp terms Flashcards

1
Q

ERL(EchoReturnLoss)

A

Lossinlevelofthereceiveaudio(echo) betweenthemixer’soutputandthe mixer’smicrophoneinput

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2
Q

AchieveTargetLevel

A

24dBsignaltonoise

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3
Q

SameLevelToAllEars

A

+/-3dB

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4
Q

AdequateElectricalSignaltoNoise

A

> 60dB

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5
Q

CriticalDistanceGoals for Mics

A

UnidirecionalMic -
Adequate Talker
Excellent Talker

OmnidirecionalMic

Adequate Talker
Excellent Talker

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6
Q

PAG

A

Poten2alAcous2cGain

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7
Q

NAG

A

NeededAcousticGain

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8
Q

What must be higher PAG or NAG

A

ThePAGmustbegreaterthantheNAGforthesoundsystemtowork

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9
Q

When to use NC (noise Cancellation)

A

When audio level is less than 24Db of Noise floor.

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10
Q

AdverseEffectsofNoise

• Ifspeechtonoisera2ois:

A

– 0-10dB-intelligibilityisunacceptabletopoor
– 10-20dB-intelligibilityispoortofair
– 20-25dB-intelligibilityisfairtogood
– 25dB+-intelligibilityisgoodtoexcellent

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11
Q

ConvergenceRate

A

TherateatwhichtheAECfiltermodelcomestoasolu2onoradaptstotheroom
• Dependsontheamountofandcharacteris2csofthereceiveaudio
• Convergencespecsareuselesswhencomparingproductsunlessallcondi2onsareiden2cal

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12
Q

ConvergenceRules

A

Convergenceoccurswhenreceiveaudio onlyispresent.Inotherwords,whenthe farsiteistalkingandthelocalsiteisquiet

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13
Q

NLP-NonLinearProcessor

A

Becauseofroomdynamics,AECwillnotremoveallacous2cecho.NLPisused
axertheAECtosuppressresidualacous2cecho.

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14
Q

AEC ( Acous;cEchoCanceler)

A

– Isuserselectableforeachmicrophoneinput
– Mustcontaintheaudiothatoriginatesinthefarendroom(s)
– Mayoxencontaintheaudiothatfeedstheroom’sloudspeaker(s)
– Mustnevercontainitsownaudio

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15
Q

PTT

A

PushtoTalk

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16
Q

PushtoTalk(PTT)Mode

A

Must freeze AEC otherwise AEC module may send an inverse transmit signal.

17
Q

Avrave Talker SPL

A

64 dBa SPL

18
Q

How many dB does each additionl Speakers at the same SPL add?

A

3 dB SPL

19
Q

ERL

A

Echo Return Loss

20
Q

ERLE

A

echo return loss enhancement

21
Q

NOM

A

Number of Open Microphones

22
Q

AEC

A

Acoustic Echo Cancellation

23
Q

NC

A

Noise Cancellation

24
Q

AGC

A

Automatic Gain Control

25
Q

ALC

A

Automatic Level Control

26
Q

Crest Factor

A

The difference between peak and average audio levels

27
Q

SNR

A

Signal to Noise Ratio

CTS-D (12 decks)

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