Elance Audio Editing Test Answers
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The psychoacoustic phenonmenon that occurs when, for example, a loud cymbal crash and a softer fragment of human speech appear simultaneously in a mix, resulting in reduced intelligibility of the speech, is known as:
Vibrato
Compression
Distortion
Masking
Low-level broadband noise is added to the signal of a 24-bit soundfile when:
Dithering down
the soundfile to 16-bit resolution
Performing hum removal on the
soundfile
Filtering out high frequency hiss
from the soundfile
Converting the sampling rate of the
soundfile
To reduce muddiness and increase bass definition when mixing a pop or rock song, it is usually a good idea to
apply a HPF to
all tracks where the bass information is not fundamental to the tone
put an equalizer on the mix bus and
cut around 1000 Hz
put an equalizer on the mix bus and
cut around 3 kHz
apply a high cut to all tracks where
the bass information is not fundamental to the tone
apply a LPF to all tracks where the
bass information is not fundamental to the tone
A digital audio soundfile with a maximum dynamic range of 96 dB is:
8-bit resolution
24-bit resolution
16-bit resolution
12-bit resolution
To bring the loudest part of a piece of audio to a specified value, without changing its relative dynamics, you would use:
Compression
Peak Normalization
Brickwall Limiting
Equalization
Maximization
A Bandpass filter:
None of the above.
mutes signals at a specified
frequency.
attenuates frequencies
outside of its specified range.
is the same as a graphic equalizer.
Approximately how much hard disk storage space is required to hold a one-hour 16 bit, 44.1 kHz stereo raw soundfile?
310 MB
620 MB
105 MB
60 MB
The digital signal processing technique for creating the most realistic sounding artificial reverberation, using impulse responses recorded in actual spaces, is known as:
Comb filtering
Convolution
Spring reverb
Multi-tap digital delay
Near-field speakers should be placed so that the tweeters are
about 1 foot above the
ears.
at ear level.
in an equilateral triangle with the
midpoint near the back wall of the room.
in the corners of a room.
Which is not a polar pattern?
Supercardioid
Cardioid
Megacardioid
Ultracardioid
Which of the following is a lossless audio format?
FLAC
MP3Pro
AAC
WMA
A limiter can be defined as
a compressor with a
ratio that is 10:1 or lower
a compressor with a ratio
that is 10:1 or higher
the best tool to put on a mix bus to
make a mix sound more professional
a compressor with a ratio that is 4:1
or higher
What is the correct voltage on Phantom Power?
48 V
18V
±48V
9V
-48V
To automatically vary the level of background music that accompanies a voice over track you would:
Apply compression to the
voice over track to keep the volume level constant
Apply auto-ducking to the
background music track based on signal input from the voice over track
Apply a limiter to the background
music track so that it never exceeds the maximum loudness of the voiceover track
Use software volume faders to
increase the level of the voice over track so that it remains audible
Parallel Compression is achieved by:
mixing two heavily
compressed versions of the same signal.
mixing two different signals with two
different types of compressors
mixing an unprocessed 'dry',
or lightly compressed signal with a heavily compressed version of the same
signal.
A client wants you to correct a song she recently recorded, saying the sound was too "boomy". If you were to EQ the song, which of these frequencies would you most likely decrease to correct this?
900 Hz
20 Hz
200 Hz
10 kHz
7 kHz
When recording, in order to minimize distortion caused by digital clipping, and to maintain consistent signal gain, it is best to use:
a compressor plug-in on
the voice over track during the mixdown process.
an outboard compressor
between the microphone signal and your audio interface.
a digital reverb plug-in during
mixdown to reduce high frequency plosives.
an outboard equalizer between the
microphone signal and your audio interface in order to boost the level of high
frequencies.
Comping is
the process of removing
noise from a track.
reducing a multi-track mix into a
stereo audio file.
upsampling audio to a higher bitrate
editing multiple takes of a
performance into a single take.
A Cardioid microphone pick up patterns are most sensitive to sound produced on
None of the above
all directions
the front side and back side of the
microphone
the front side of the
microphone
In the majority of music recording situations, what is the most critical step in the recording chain.
Microphone
placement
The master output
Understanding and utilizing the EQ to
fix recording problems
Correct application of audio
compression
Mastering
In order to eliminate or minimize clicks between soundfile edits, you should try to place your edits on:
Waves whose phase
directions are identical
The peak amplitude level of the sound
waves
A zero crossing point of the
sound waves
Which of the following combinations of digital recording bit resolution and sampling rate will yield the best audio quality?
8 bit and 192 khZ
24 bit and 44.1 kHz
24 bit and 96 kHz
16 bit and 44.1 kHz
When using a compressor, the ratio setting (such as 4:1 or 2:1) will control
the amount of gain
reduction applied when the input exceeds the threshold. The higher the ratio,
the less compression is applied.
the amount of makeup gain applied to
the compressed signal.
the amount of gain reduction
applied when the input exceeds the threshold. The higher the ratio, the more
compression is applied.
the mix between the dry and wet signal
In order to create the illusion that a passage of ADR dialogue recorded dry in a studio was actually recorded on location, you would mix in a small amount of:
Location-recorded
room tone
Studio-generated AC hum
White noise
After recording a number of digital audio soundfiles, the process used to ensure that the peak amplitude of each soundfile is maximized is called a:
Convolution
Normalization
Compression
Limiting
To avoid digital clipping on a multitrack mix you would:
Do all of these
Ensure that any applied gain boost or
signal processing effects do not cause any soundfile's maximum amplitude to
exceed 0dB
Ensure that each track is recorded with
a peak level that does not exceed 0 dB
Apply a brickwall limiter with maxium
gain of approximately -1 dB to the final output mix buss
Imagine that you are a voiceover actor/actress. What is the best way to achieve professional sound quality for your vocal performance?
Record into analog
outboard gear before feeding the audio into your DAW.
Arrange microphones and set
other equipment levels correctly so that the sound at the beginning of the
recording chain is optimum.
Use a LPF, a HPF, and other filters
to cut out unwanted frequencies.
Make sure that you record at the
highest bit rate possible.
Use the most expensive condenser
microphone that you can afford.
Which of the following is a widely used DAW by engineers today?
Logic Pro
Pro Tools
(all of these)
Ableton Live
When using a parametric equalizer, the Q setting determines
the amount of gain
applied to the band
the width of the frequency
band
the quality of the band
the center frequency of the band
The signal processing plug-in used to reduce excess vocal siblance is called a:
Vocoder
De-esser
De-limiter
De-noiser
A type of microphone requiring phantom power is a:
condenser
microphone
cardiod microphone
omnidirectional microphone
dynamic microphone
A 1:1 ratio setting on a compressor would yield
no change to
the input
a 2 DB decrease in gain
a 1 DB increase in gain
a 1 DB decrease in gain
a 2 DB increase in gain
The standard soundfile specification for CD quality audio is:
16-bit, 44.1
kHz sampling rate.
16 bit, 48 kHz sampling rate.
24-bit, 96 kHz sampling rate.
24-bit, 192 kHz sampling rate.
What bit depth of digital audio file is better for Audio processing ?
4 bit
24 bit
16 bit
8 bit
Which two instruments should you keep in mono in order to add more punch and focus to a Rock/Pop mix?
Hats and High Strings
Horns and Guitars
808 Kick and High Hats
Bass and Kick Drums
Pads and Guitars
To remove a single unwanted frequency from a digital audio signal, you would use:
A low pass filter
A mega.X.horn filter
A notch filter
A high pass filter
DAW stands for
Distortion Amp
Workstation
Digital Audio Waveform
Digital Audio Workstation
Digital Amplitude Waveform
The standard sample rate specification for CD quality audio is:
41.1 kHz
44.1 kHz
44.4 kHz
48 kHz
Which of the following mp3 file compression rates yields the best audio fidelity:
24 mbps
96 mbps
160 mbps
320 mbps
How many volts is Phantom Power?
60
42
120
48
24
Localizing a sound in within the perceived left-right stereo field requires the technique known as:
phase reversal.
digital delay.
equalization.
panning.
to hear only the output of a single track in a multichannel mix, you would use
solo
postfade
monitor
prefade
mute
What is the type of distortion that occurs when a digital signal is recorded too loudly?
Digital
clipping
Tube saturation
AC hum
Quantization noise
What does the NORMALIZE command do to an audio track?
Raises the gain
of the entire track to the point where the highest peak is just below clipping
Analyzes the track for any errors and
corrects them
Bypasses any plugins on the track,
thereby reverting it to its original state
Adjusts the track to correct polarity
During the CD mastering stage of production, you would normally:
Listen to your mixes on
a variety of speaker systems in order to ensure that they sound good on each
system
Do all of these
Perform sample rate conversion from
96 kHz to 44.1 kHz
Apply EQ, multi-band compression and
limiting in order to ensure a good overall frequency balance and consistent
volumes among songs
What does LFO stand for?
Lyte Funky Ones
Long File Order
Low Frequency Oscillator
Last Frequency Order
Long Frequency Oscilation
Which type of microphone requires phantom power?
Tube driven
Ribbon
Cardioid
Dynamic
Condenser
The best way to join two soundfiles together so that there is a smooth transition without silence between the sounds is to use:
A loop
A butt splice
A paradox
An overlapping crossfade
The term for sounds resulting from the pronunciation of "P" and "B" letters in voice recording is
Plosives
Puffs
Pops
Clipping
Buffeting
When preparing a 24 bit digital audio soundfile for audio CD production, you will need to:
Use dithering,
while reducing bit resolution to 16 bits
Increase bit resolution to 32 bits
Increase gain in order to introduce
clipping
Maintain bit resolution, while
performing sample rate conversion to 44.1 kHz
Using a sampling rate of 11 kHz when digitally recording a sound with a lot of high-frequency content can result in unwanted artifacts known as:
Clipping
Dithering
Aliasing
Hum
Any inaccuracies of a sampling frequency into and back out of the digital domain from the analog domain is referred to as:
amplitude
latency
bouncing
jitter
A single MIDI link can carry up to
32 channels of
information
8 channels of information
16 channels of information
None of the above
When Proximity effect occurs, which frequencies appear louder?
Mids
Lows
Highs
Imagine receiving a vocal audio file. Each time the vocalist stops talking, you hear an air conditioner running. What is the best way to eliminate the noise from those pauses?
Use track
automation and mute the sections with the noisy a/c.
Use track automation and only use the
compressor on the noisy section.
Use track automation and bypass the
compressor on the noisy section.
Use light compression
Use gentle compression with
side-chaining to duck the noisy section
Which of the following combinations of digital recording bit resolution and sampling rate will yield the worst audio quality?
24-bit, 192 kHz sampling
rate
32-bit, 44.1 khz sampling rate
16-bit, 1 kHz sampling rate
8-bit, 22.05 kHz sampling rate
Upon playback In a studio environment, bass frequency response tends to be weakest
closer to the floor.
at the end of the longest part of the
room.
at the halfway point of a
rectangular room.
in any given corner.
The dynamic range of a 24 bit soundfile is approximately ______dB.
144
96
48
120
What type of dynamics processor adds gain to signals that fall below the threshold setting?
Upward
compressor
Downward expander
DeEsser
Downward compressor
Upward expander
Approximately how much hard disk storage space is required to hold a fifteen-minute, eight-track digital audio session recorded at 24 bit, 192 khz?
4 MB
2 GB
8.1 GB
4 GB
Approximately how much hard disk storage space is required to hold a thirty-minute, sixteen-track digital audio session recorded at 24 bit, 96 khz?
1.7 GB
16.2 GB
8.1 GB
8.6 MB
For an mp3 file, "128 kbps" compression stands for:
128 kilobytes per sample
128 kilobytes per second
128 kilobits per sample
128 kilobits per second
From the choices below, what is the minimum sampling rate you need to use to record and perfectly reproduce a frequency of 14000 Hz?
16000
32000
22050
44100
96000
The reverberation time of a signal is:
The amount of time
required for a signal to decay by 6 dB
The amount of time required for a
signal to decay by 10 dB
The amount of time required
for a signal to decay by 60 dB
The amount of time for a signal to
reach 1/2 its original amplitude
When using a noise reduction plug-in to reduce unwanted background hiss, you would increase which plug-in parameter in order to minimize unwanted digital "bubbling" artifacts?
Smoothing
Noise threshold
Envelope release time
The electrically induced artifact in a digital audio signal, whereby the mean amplitude of the signal is above zero, and which can lead to audible distortion is known as:
White noise
DC offset
Digital clipping
AC modulation
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