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Test your basic knowledge |
Digital Audio
Start Test
Study First
Subject
:
engineering
Instructions:
Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can
study here
.
Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.
This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. Six channel (five speakers and one subwoofer for bass) digital surround sound system by Dolby
Dolby 5.1
Impulse Response
Sampling Theorem
Intensity Stereo
2. Mixing data and control characters in a single operation
Storage Conversion Steps
Interleaved
Requirements for CD Audio
Morse Code
3. Having a repeated succession of waves or curves as in a sound waveform
Sinusoidal
Internal Resolution
Pulse Code Modulation
Nyquist Frequency
4. Father of modern information theory; Solidified the Nyquist Theory by adding the concept that bits per second (binary representation of audio signals) must be at equal intervals to accurately represent data
Claude Shannon
Impulse Response
Attenuation
Conversion Buffering
5. Difference in brightness between land and pit on a CD Physical Format
Index of Reflectivity
Direct Stream Digital
Pass Band
Threshold of Hearing
6. Roughly around 1 -130 ft/s
Data Packing
Speed of Sound
Delta-Sigma Modulation
Sampling (Samples)
7. 'Capturing' part of digital audio; Never captures a signal perfectly
A/D Conversion
Floating Point
SACD
Dolby 7.1
8. HD Audio format; Lossless Compression; 24- bit/96 kHz; 5.1 Surround or 24- bit / 192 kHz stereo sound
Sample Rate
CPU Buffering
DVD-Audio
Compression
9. Improper (false) sampling of high frequencies that cause much lower frequencies to be produced when the audio is reconstructed; Foldover happens at higher frequencies as harmonics reach levels that exceed the Nyquist limit.
Significand
Aliasing
DVD-Audio
Oversampling
10. Apple Lossless; Windows Media Lossless; DTS HD Master Audio; Dolby True HD; FLAC
Red Book
Y-Axis Terminology
Lossless Formats
Footroom
11. 7.95 GB; SS/DL
Spectrum Multiplication
DVD-9
Fourier Series
Requirements for A/D Conversion
12. ABR; Codecs that encode data by determining how dense or sparse areas of the audio are while also keeping bit rate within specified limits to avoid rebuffering
Bit Rate
Average Bit Rate
dB/SPL
Footroom
13. Each bit in the bit depth is equal to a _____ increase in dynamic range
6 dB
Base 2 System
Edit Decision List
AES3
14. Number or variable that represents the number of times the base of a power is used as a factor; Defines magnitude
Exponent
Compression
Quantization Error
A/D Conversion
15. 15.9 GB; DS/DL
Buffering Locations
DVD-18
TOSLINK
Threshold of Hearing
16. AES
MONO
Exponent
Latency
Audio Engineering Society
17. 1.) Taking a series of evenly- spaced measurements 2.) Signal contains no frequency components higher than half the sample rate
Decimation Filter
Requirements for A/D Conversion
Compression
Variable Bit Rate
18. Serial Copy Management System; main difference between AES3 & S/PIDF
Dithering
Data Packing
SCMS
Motion Pictures Experts Group
19. The process of reducing the space required to store data by efficiently encoding the content.
Analog
Compression
A/D Conversion
Audio over Ethernet (AoE)
20. Most significant lossless coding technique in current use; Measure of disorder in which long strings of data are represented by short symbols and uses the shortest symbols to represent the most common repetitive audio data maximizing data reduction
Oscillation
Class - D Amplifier
Psychoacoustics
Entropy Coding
21. Rate at which energy is drawn from a source that produces a flow of electricity in a circuit; Expressed in volts
Voltage
Dynamic Range
Intensity Stereo
DVD-10
22. Signal voltage is relayed to a register from sample- and - hold circuit; Holds reference frequencies in binary form that decrease in value; Finds approximated value & assigns binary number accordingly
Anti-Aliasing Filter
Successive Approximation
Transfer Protocol
Peak Level
23. The continuous loss of signal strengths as a signal travels through a medium
Sony-Philips Digital Interface Format (S/PDIF)
Dolby 5.1
Sample Rate
Attenuation
24. ADPCM; Pulse code modulation that produces a digital signal with a lower bit rate than standard PCM; Records only the difference between samples
Logical Format
Sample- and-Hold
Adaptive Pulse Code Modulation
Playback Buffering
25. Measure of the amplitude of a longitudinal wave
Intensity
Equal Loudness Contour
CPU Buffering
Coaxial
26. DAW's and software must buffer when converting or bouncing and this latency can add up if not monitored
Conversion Buffering
Quantization Error
Fletcher- Munson Curve
Variable Bit Rate
27. A drive that can read and write on optical media that hold up to 50 GB on two layers; 24- bit/96 kHz for 8-Channel; 24- bit/192 kHz for 6-Channel
Multichannel Audio Digital Interface (MADI)
D/A Conversion
Blu-Ray
Word Clock
28. Used as the main disc from which other discs are made; Composed of ground glass with a very fine photoresistor layer; An imaging laser burns pit and land patterns in preparation for duplication
Threshold of Pain
Additive Synthesis...
Oversampling
Glass Master
29. Method used in digital recording and reproduction in which a signal is sampled at various points and the resulting value is translated into binary numbers
Fletcher- Munson Curve
Pulse Code Modulation
Threshold of Hearing
Effective Bit Depth
30. The mathematics - algorithms - and the techniques used to manipulate signals after they have been converted to digital form
Audio over Ethernet (AoE)
Digital Signal Processing
EtherSound
European Broadcasting Union
31. More aggressive lossy data reduction techniques that require further manipulation of the stereo field; Examples are 'Intensity' & 'M-S'
Joint Stereo
DVD-18
CobraNet
Lossless Formats
32. Same as 'aliasing'
Lossless Formats
Non -Compressed Audio Data Rate Formula
Foldover
Additive Synthesis...
33. Overtones that contribute to the timbre of a sound and make up a complex waveform's physical characteristics
Frames
Harmonic Content
Digital
Signal- to- Noise Ratio
34. Only 2 digits used; The value of each place (ones - hundreds - etc.) are as follows from greatest to least: 128 - 64 - 32 - 16 - 8 - 4 - 2 - 1
Base 2 System
Red Book
Coaxial
Lossy Formats
35. The frequency above or below which attenuation begins in a filter circuit
Cutoff Frequency
Acoustics
Spectrum Multiplication
Lossy
36. Visual graph that shows how loud a sound is at different frequencies
Sonogram
Sine Wave
Red Book
Lightpipe
37. AAC (Advanced Audio Coding); MP3; RA; WMA; OGG Vorbis; Dolby Digital/AC-3; DTS; ADPCM
Quantizer
Class - D Amplifier
Dolby 5.1
Lossy Formats
38. Algorithm uses matrix of a mid/side microphone pair to determine a side signal & that signal is reduced then distributed as code in stereo
Data Packing
Physical Disc Format
M-S Stereo
Buffering
39. Lossless Format; Can hold up to 25GB on a single- layer disc and 50GB on a dual- layer disc
I/O Connection Buffering
Sample Rate
Blu-Ray
Transfer Protocol
40. Method of representing an acoustic quantity with a series of binary numbers; Can have only specific individually distinct values
Digital
Threshold of Pain
Sampling Theorem
Compression
41. Take up half as many bits (50%); Algorithm can keep same quality by lossing the stereo track
Index of Reflectivity
Perceptual Coding
Ethernet
MONO
42. Ultra low- latency - 512- channel (on a gigabit network) - less flexible AoE format; Routed like audio cables...not network cables
D/A Conversion
0 dB FS
Intensity Stereo
EtherSound
43. A method of representing real numbers using a mantissa and an exponent
Glass Master
Floating Point
Footroom
Data Packing
44. High channel count; 64 channels on one cable; Coaxial cable with BNC connector or fiber optic with ST1 connector
Amplitude Accuracy
Physical Disc Format
Peak Level
Multichannel Audio Digital Interface (MADI)
45. (Amplitude Based) Amplitude: Voltage; Quantization; Bit Depth; Quantization Intervals; Quantization Noise; [Signal:Quantization Noise Ratio]; Dither; Dynamic Range
Quantization
A/D Conversion
Cutoff Frequency
Y-Axis Terminology
46. Deviation from a normal - steady pulse or tick of a clock that contributes to misrepresentation of a signal; Result of small timing irregularities that become magnified during the transmission of digital signals as the signals are passed from one dev
A/D Conversion Signal Flow
Decimation Filter
Jitter
Dolby 7.1
47. Signal that uses variable voltage to create continuous waves resulting in an inexact transmission
Pass Band
Analog
Sinusoidal
Joint Stereo
48. Anytime bit depth is reduced the gap gets bigger so more dithering is required
Redither
Successive Approximation
Footroom
Tascam Digital Interface Format (TDIF)
49. How Loud (Y-Axis) & How Fast (X-Axis)
Rarefaction
A/D Conversion Signal Flow
2 Dimensions of Sound
Intensity
50. Occurs as data is assembled into meaningful bits or information and as left & right channels are separated
Digital Signal Processing
I/O Connection Buffering
Bit Rate
Bit Depth Effect on Dynamic Range
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