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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. Pertaining to hearing or sound; Combination of the intensity of air pressure molecules with amplitude
Attenuation
Acoustics
Intensity Stereo
Dithering
2. 1st commercially successful AoE format for the transmission of digital audio - video - and control signals over 64- channel 100Mbps Ethernet networks
CobraNet
Noise Shaping
Lossless
Codec
3. Psychoacoustic model of data reduction used for general audio compression that aims to transmit only features perceptible to the human ear; Useful for mastering streaming media
Perceptual Coding
Cutoff Frequency
Data Packing
Transfer Protocol
4. Data reduction technique that selectively removes original information in order to significantly reduce the file size; Some data is lost; Files can be reduced up to 99% in size (90% with no perceived sound quality loss); Bit rate effects the perceive
Data Packing
Glass Master
Lossy
Psychoacoustics
5. AAC (Advanced Audio Coding); MP3; RA; WMA; OGG Vorbis; Dolby Digital/AC-3; DTS; ADPCM
Lossy Formats
Anti-Imaging Filter
Data Packing
Constant Bit Rate
6. The difference in volume between the loudest and quietest sounds of a source
Significand
Compression
Dynamic Range
Coaxial
7. The art of deciding where to place a processor in signal flow based on how that processor will be influenced by the other processors in the path
MONO
Gain Staging
Quantization Error
Quantization
8. Allowance of noise floor below that which is required for the final product
Footroom
Overflow
I/O Connection Buffering
Effective Bit Depth
9. Built into DAWs; Bits are added when signals are mixed together to avoid clipping
Headroom Bits
Photoreceptor
AoE Formats
Nyquist Frequency
10. Perceptual coding technique that uses louder sounds of a similar frequency to decide what information is to be saved during data reduction
Latency
Masking Analysis...
Fidelity
Acoustics
11. Sony and Philips optical disc format; Utilizes sigma delta DSD to offer higher resolution; 1- bit; 2.8224 MHz; 6-Channel
Intensity
Voltage
Variable Bit Rate
SACD
12. Serial Copy Management System; main difference between AES3 & S/PIDF
Micron
Multichannel Audio Digital Interface (MADI)
I/O Connection Buffering
SCMS
13. How Loud (Y-Axis) & How Fast (X-Axis)
2 Dimensions of Sound
Latency
Entropy Coding
Digital Signal Processing
14. The mathematics - algorithms - and the techniques used to manipulate signals after they have been converted to digital form
Digital Signal Processing
Jitter
Algorithm
Buffer Size
15. (Amplitude Based) Amplitude: Voltage; Quantization; Bit Depth; Quantization Intervals; Quantization Noise; [Signal:Quantization Noise Ratio]; Dither; Dynamic Range
Edit Decision List
Y-Axis Terminology
Oversampling
Lossy Formats
16. A method of representing real numbers using a mantissa and an exponent
AoE Formats
Lossless
Floating Point
Nyquist Frequency
17. CobraNet; EtherSound; Dante; AVB (currently under development)
Acoustics
Claude Shannon
Foldover
AoE Formats
18. 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
Fletcher- Munson Curve
Audio over Ethernet (AoE)
Frequency
Base 2 System
19. Used when the reference pressure of a sound is 20 microPa (0.00002); Sound Pressure Level; Measure of amplitude
MONO
Sample- and-Hold
SACD
dB/SPL
20. Reduces the percieved distortion due to quantization error; Low level white noise source is introduced to make the profile of the quantization 'noise' more irregular; Useful when reducing the number of bits per word in a signal (i.e. when converting
0 dB FS
Dithering
Decimal- to-Binary Conversion
Multichannel Audio Digital Interface (MADI)
21. Lossless Format; Can hold up to 25GB on a single- layer disc and 50GB on a dual- layer disc
Constant Bit Rate
Lightpipe
Recording Levels
Blu-Ray
22. Increases D/A sample rate from nominal rate to oversampling rate by turning series multi- bit PCM samples into 1- bit samples; (ex. => 44.1kHz sample rate converted to 2.8MHz and simultaneously converts multi- bit samples to 1- bit); Low Pass Filter
Gain Staging
Interpolation Filter
Oversampling
Headroom Bits
23. 'Capturing' part of digital audio; Never captures a signal perfectly
CobraNet
Word Clock
A/D Conversion
Sony-Philips Digital Interface Format (S/PDIF)
24. 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
Equal Loudness Contour
Aliasing
Jitter
Joseph Fourier
25. High Pressure - Part of a longitudinal wave where the particles of the medium are close together
DVD-9
Sample- and-Hold
Decimation Filter
Compression
26. Method of sampling data at a higher resolution (higher sample rate) as a means of reducing harmonic content during D/A conversion; (x2) oversampling gets rid of all odd harmonic content
Oversampling
Voltage
Dynamic Range
Red Book
27. Difference in brightness between land and pit on a CD Physical Format
Foldover
Index of Reflectivity
Sample Rate
Intensity Stereo
28. Measuring equipment in A/D conversion that processes voltage and provides a value for that voltage
CPU Buffering
Quantizer
Latency
Low-Latency Monitoring
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
Red Book
Pulse Code Modulation
Cutoff Frequency
Effective Bit Depth
30. 1.) Taking a series of evenly- spaced measurements 2.) Signal contains no frequency components higher than half the sample rate
Oversampling
Requirements for A/D Conversion
Logical Format
Gain Staging
31. Based on psychoacoustics - these are the basis of frequency analysis for a perceptual codec;
Subbands
Stapedes Reflex
Voltage
Delta-Sigma Modulation
32. 15.9 GB; DS/DL
Lossless
Analog
AoE Formats
DVD-18
33. Circuit that seizes voltage values with each tick of an A/D device's internal clock
Micron
Masking Analysis...
Sample- and-Hold
Index of Reflectivity
34. Leaving space at beginning and ending of song for data crunching during mastering; Last step in mastering process
Decimation Filter
CPU Buffering
Pad Head & Tail
Voltage
35. A time regulator that makes all samples and bits to align when working with interconnected digital devices; Basically a signal that all of the digital devices refer to when operating.
Word Clock
Index of Reflectivity
AoE Formats
Blu-Ray
36. Series of dots and dashes representing the letters of the alphabet; Most common letters are represented by the shortest dots and dashes; Example of entropy coding
Speed of Sound
Joseph Fourier
Decimation Filter
Morse Code
37. EDL; Final list of samples used in the audio editing process; Identified by time code
Red Book
Edit Decision List
Data Packing
X-Axis Terminology
38. 7.95 GB; SS/DL
Successive Approximation
DVD-9
0 dB FS
Y-Axis Terminology
39. Algorithm uses matrix of a mid/side microphone pair to determine a side signal & that signal is reduced then distributed as code in stereo
M-S Stereo
European Broadcasting Union
Latency
Pass Band
40. Sum of all harmonics; Sum of sine and cosine waves which have frequencies f - 2f - 3f - 4f...
Quantization
CPU Buffering
Digital Signal Processing
Fourier Series
41. Root Mean Square; Refers to taking the square root of all instantaneous amplitudes; Takes the average of those squares; (-6 Peak Level is approximately equal to -20 RMS)
Threshold of Pain
Quantizer
Buffer Size
RMS
42. Six channel (five speakers and one subwoofer for bass) digital surround sound system by Dolby
Dolby 5.1
Sine Wave
Audio over Ethernet (AoE)
Pulse Code Modulation
43. Number or variable that represents the number of times the base of a power is used as a factor; Defines magnitude
Red Book
Exponent
DVD-10
Successive Approximation
44. Process of building a complex tone by starting with the fundamental frequency and adding pure tone harmonics
Optical Cable
Subbands
Additive Synthesis...
SACD
45. Signal conversions are mixed with playback tracks resulting in near-zero latency
Blu-Ray
Intensity Stereo
Direct Monitoring
Threshold of Hearing
46. Circuit that interprets the meaning of the symbols as they were chosen and arranged by the encode
Cutoff Frequency
Decoder
Harmonic Content
Class - D Amplifier
47. Sample Rate x Bit Depth x # of Channels
Intensity Stereo
RMS
Non -Compressed Audio Data Rate Formula
Speed of Sound
48. The frequency above or below which attenuation begins in a filter circuit
Cutoff Frequency
Dynamic Range
European Broadcasting Union
Delta-Sigma Modulation
49. 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
Aliasing
Blu-Ray
Harry Nyquist
Compression
50. Softest sound that can be heard by the average human ear (0 dB)
Threshold of Hearing
Fidelity
Lossy
Data Packing