The three components of an AV experience are _____.

A "just noticeable" change in sound pressure level, either louder or softer, requires a _____ change.

+/-3dB

A consumer line level is _____ while professional line level is about _____

0.316 V; 1.23 V

A video CD has a bit rate of _____.

1 Mbit/s

Which sequence of numbers depicts part of a logarithmic scale?

1, 10, 100, 1000

Phantom power typically ranges from _____ VDC.

12:48

If a sound has a pressure of 10 dB SPL at a distance of 10 m, how much pressure would the sound have at a distance of 5 m?

16 dB SPL

The equation which correctly states the difference in decibels for two voltages or distances is _____.

20 times the logarithm of the ratio of the two numbers being compared

A professional microphone should have an output impedance of _____ ohms or less.

200

A value with 16 possible states is referred to as _____

4-bit

If you go up one octave from 250 Hz, you arrive at _____.

500 Hz

combination

A _____ audio system includes a music and speech reinforcement system.

Low impedance microphones _____.

Allow for longer cable runs

is other than the desired signal

Ambient noise is defined as anything that _____.

To meet the Nyquist Rate criteria, the sampling rate needs to be _____.

At least twice the frequency of the signal being sampled

Which of the following is allowed by a parametric equalizer?

Center frequency and bandwidth adjustments

A brainstorming meeting in an office would fall into the characterization of

Collaboration

_____ prevent loud signals from being too loud.

Compressors

_____ are the result of a(n) _____ reflection.

Echoes, late

When participants encounter an AV experience with a characterization of _____, engagement is detected by participants making their own path through their experience.

Exploration

The simultaneous use of multiple wireless microphone systems requires _____.

Frequency coordination

What is the measurement for frequency?

Hertz

A lecture given by a prominent member of a specific field falls into the characterization of

Instruction

Many amplifiers now have a built-in _____ to protect themselves from severe clipping and overdriving of the audio signal.

Limiter

_____ are used to limit the impact of extreme sound pressure spikes, such as a dropped microphone.

Limiters

Two common digital video formats are _____.

MPEG and AVI

Propagation deals with the _____ of sound.

Movement

What is the biggest difference between a playback system and a music reinforcement system?

Music reinforcement systems use microphones

Which meter is often found in audio mixers?

PPM

Wavelength is the _____.

Physical distance between two points of a waveform that are exactly one cycle apart.

Wavelength and frequency determine the _____ of sound, while amplitude determines the _____.

Pitch; volume

A high pass filter is typically used during equalization for _____.

Removing rumble from an HVAC system.

Which of the following is one possible covering for twisted pair cable?

Rubber

The three components of an AV experience are

Space, Content, and Technology

The strength of the signal from a dynamic microphone is _____.

Stronger than a condenser microphone's signal level

An AV Expert has the highest level of control when it comes to

Technology

The conversion of energy from one form to another is called _____.

Transduction

Which types of drivers provide high frequencies within loudspeakers?

Tweeters

The _____ meter is commonly used to monitor broadcast signals.

VU

What is a codec?

a device or program that encodes and decodes file information

An octave is

a doubling of frequency

What is a decibel?

a logarithmic scale used to describe ratios with a large range of values

A crossover is _____.

an electrical frequency dividing network circuit

A signal that has many varying states is called a(n) _____ signal.

analog

In a _____ design, both conductors are used to transport the signal.

balanced

If sound energy is absorbed by the materials in the space, it has _____.

been converted to heat

Both conferencing and audioconferencing is communication _____.

between groups of people

A "mix-minus" system might be used in a(n) _____.

boardroom

In a dynamic microphone, there is a(n) _____ attached to a diaphragm and placed in a permanent magnetic field.

coil of wire

The function of an audio mixer is to _____.

combine, control, and route audio signals from inputs to outputs

In simple public address systems, loudspeakers are used for _____.

communication

The sensitivity specification in loudspeakers is concerned with _____.

converting electrical energy into acoustic energy

As noise is introduced to a(n) _____ signal, discerning circuitry can determine if the signal is intended to be high or low, and then retransmit a solid signal without the imposed noise.

digital

Sound energy can reflect in either _____ fashion.

direct or scattered

Vibration _____ molecules in the air to produce sound.

displaces

Compressors, limiters, and expanders are all _____.

dynamic processors

Audioconferencing equipment makes use of acoustic _____ technology.

echo-cancellation

Because air is a(n) _____ medium, vibrated molecules transmit motion to the molecules surrounding them.

elastic

Signal processing circuitry and cables are subject to surrounding sources of _____.

electrical noise

For the purpose of sound reinforcement, loudspeakers are at the end of the _____ path.

electrical signal

When a live microphone is placed too close to a loudspeaker, _____ will occur.

feedback

A porous absorber slows down air molecules using _____.

friction

If a technician changes the level of a signal, it is called _____.

gain adjustment

Which of the following can be used to automatically turn off unused microphones?

gates

Lower sensitivity microphones _____

handle higher sound pressure levels

What kind of facility might use a sound masking system?

hospital

The sampling rate is defined as _____.

how many samples of an analog signal are taken in a given time interval

The primary purpose of a sound masking system is to _____.

increase background noise levels to increase privacy

Sound reinforcement systems are used to perform which of the following?

increase the sound distributed over a larger area

Complex waveforms can be broken down into _____.

individual sine waves

Besides a power switch, what else can modern amplifiers have?

input sensitivity controls and digital signal processing

output impedance

is a necessary specification for a microphone.

The second conductor of an unbalanced circuit _____.

is a shield around the wire used as the electrical circuit's return path

Which of the following reinforcement systems includes full bandwidth abilities?

music

The impedance will _____ over the loudspeaker's entire frequency range

not be the same

Transmission is defined as sound energy that is _____.

not reflected or absorbed

A logarithm can be defined as the _____

number of times the numeral 10 must be multiplied by itself to get a certain value

The digital waveform is always _____.

on or off

In a digital signal, the "on" state is represented by _____, and the "off" state is represented by _____.

one; zero

What does a low pass filter do?

passes the low frequency content of a signal

An audio conference typically involves groups of _____.

people

A(n) _____ is a graphical representation of the microphone's directionality and electrical response characteristics.

polar plot

Which of the following best describes an electret, when used in a microphone?

prepolarized material

Sound _____ through a medium.

propagates

Phantom power is the _____ required to power a condenser microphone.

remote power

Numerous, persistent reflections of sound are called _____.

reverberation

Files created using lossy compression are typically _____ than files using lossless compression.

smaller

The "audio" portion of "audiovisual" refers to _____.

sound

When sound is generated, energy is spread

spherically in all directions

When sound is generated, energy is spread _____.

spherically in all directions

Bit depth is defined as the number of _____ you have in which to describe the value of a digital signal

states

The amplifier comes right before _____ in the audio system chain.

the loudspeakers

0 dB SPL describes:

the threshold of human hearing

Harmonics are _____.

the whole number multiples of a fundamental frequency

What is the main function of a graphic or parametric equalizer?

to boost or cut a specific frequency range

The quality of a file can suffer if _____.

too much data is removed

What does a gain sharing automatic mixer do?

turns up used microphone channels and turns down unused microphone channels

The cabling used with balanced circuitry uses _____ signal conductor(s) while the cabling used with unbalanced circuitry uses _____ signal conductor(s).

two; one

Intercoms are _____ located within the same building or complex of buildings.

typically

Paging systems are _____.

used to convey clear communication to a large audience

One characteristic of a playback system is its _____ bandwidth.

wide