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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. CobraNet; EtherSound; Dante; AVB (currently under development)
Acoustics
Aliasing
AoE Formats
Latency
2. 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
Psychoacoustics
AES3
Average Bit Rate
Aliasing
3. Signal conversions are mixed with playback tracks resulting in near-zero latency
Direct Monitoring
Interleaved
Harmonic Content
Latency
4. The set of rules that computers use to move files from one computer to another on an internet
Quantization Intervals
Threshold of Hearing
Sine Wave
Transfer Protocol
5. Twice as many samples as the highest frequency at minimum; Sampling rate totally controls frequency response
Logical Format
Aliasing
Acoustics
Sampling Rule
6. VBR; Most common & best data reduction technique; Codecs that encode data by determining how dense or sparse areas of the audio are; Can result in buffering issues
Intensity
Variable Bit Rate
Lossless Formats
Dithering
7. 7.95 GB; SS/DL
Y-Axis Terminology
Data Packing
DVD-9
Normalizing
8. Waveform of a pure tone showing simple harmonic motion
Optical Cable
Fletcher- Munson Curve
Sine Wave
Buffering
9. More accuracy in low amplitudes and less in higher amplitudes
Requirements for CD Audio
Amplitude Accuracy
Joseph Fourier
DVD-10
10. Single- pin RCA cable or fiber- optic TOSLINK connector used for digital transfer; 75O coaxial - 2- channel unbalanced; 'Consumer' format of AES3
Sony-Philips Digital Interface Format (S/PDIF)
I/O Connection Buffering
MONO
Zero-Latency Monitoring
11. Amplitude meter that takes the square root of all instantaneous amplitudes and averages them to find a mean and squares that value; Useful with particularly complex waveforms
RMS Meter
Variable Bit Rate
DVD-Audio
Noise Shaping
12. Smallest interval measurable by a scientific instrument; Defined by bit rate (sample rate x bit depth)
Resolution
Transfer Protocol
Entropy Coding
Internal Resolution
13. 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
Fourier Series
Pulse Width Modulation
Sony-Philips Digital Interface Format (S/PDIF)
14. Built into DAWs; Bits are added when signals are mixed together to avoid clipping
DVD-5
Bit Rate
Headroom Bits
Sinusoidal
15. Occurs as data is assembled into meaningful bits or information and as left & right channels are separated
Micron
Codec
I/O Connection Buffering
Sony-Philips Digital Interface Format (S/PDIF)
16. Measure of sound pressure over the frequency spectrum - for which a listener perceives a constant loudness when presented with pure steady tones
Oversampling
RMS Meter
Quantization Intervals
Equal Loudness Contour
17. AAC (Advanced Audio Coding); MP3; RA; WMA; OGG Vorbis; Dolby Digital/AC-3; DTS; ADPCM
Buffering
Acoustics
MONO
Lossy Formats
18. Having a repeated succession of waves or curves as in a sound waveform
Audio over Ethernet (AoE)
Sinusoidal
Noise Shaping
Adaptive Pulse Code Modulation
19. 1st commercially successful AoE format for the transmission of digital audio - video - and control signals over 64- channel 100Mbps Ethernet networks
Voltage
A/D Conversion
CobraNet
Sample Rate
20. As sample rate is increased more room is created for a smoother slope of the attenuation band because Nyquist limit extends well beyond range of hearing with each increase
Constant Bit Rate
Codec
Sample Rate Effect on Anti-Aliasing
6 dB
21. Toshiba developed digital audio interface utilizes fiber optics as a transmission medium.
Psychoacoustics
Nanometer
Direct Monitoring
TOSLINK
22. Difference in brightness between land and pit on a CD Physical Format
Index of Reflectivity
DVD-Audio
Direct Stream Digital
Audio Engineering Society
23. Industry Standards: -6 dB Peak = -20 RMS Meter
Audio Engineering Society
Word Clock
Recording Levels
Nyquist Frequency
24. How Loud (Y-Axis) & How Fast (X-Axis)
Interpolation Filter
Perceptual Coding
Pulse Density Modulation
2 Dimensions of Sound
25. Allowance of noise floor below that which is required for the final product
Morse Code
Floating Point
Quantizer
Footroom
26. 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
Algorithm
DVD-18
Direct Monitoring
Jitter
27. Unit of measurement that is equal to one billionth of a meter
D/A Conversion Signal Flow
Ethernet
Nanometer
Variable Bit Rate
28. The amount of energy at each wavelength
Spectra
Compression
Cutoff Frequency
Dithering
29. Data reduction technique that does not effect quality of original audio; No effect on original quality; Typically around 50% reduction; Exact reconstruction of digital code for the audio signal
Lossless
Amplitude Accuracy
Fourier Series
A/D Conversion Signal Flow
30. Anytime bit depth is reduced the gap gets bigger so more dithering is required
Fletcher- Munson Curve
Constant Bit Rate
Redither
Lossy
31. Unit of measurement that is equal to one millionth of a meter
Micron
Quantization
Buffering
Direct Stream Digital
32. Method of representing an acoustic quantity with a series of binary numbers; Can have only specific individually distinct values
Pulse Density Modulation
Digital
Algorithm
Impulse Response
33. Have odd numbered harmonics
Anti-Imaging Filter
SCMS
DVD-5
Square Wave
34. 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)
Impulse Response
RMS
Coaxial
Micron
35. A sample- by- sample operation on two signals
AES3
Convolution
Edit Decision List
Buffering Locations
36. High channel count; 64 channels on one cable; Coaxial cable with BNC connector or fiber optic with ST1 connector
Zero-Latency Monitoring
Threshold of Pain
Multichannel Audio Digital Interface (MADI)
Redither
37. Removes high frequency images and noise and smoothes the stair case output coming from of the sample and hold circuit; Also called a SMOOTHING FILTER
Convolution
Significand
I/O Connection Buffering
Anti-Imaging Filter
38. Reference voltage determined by summing the voltage values of a predetermined number of previous samples; Numbers of 1 in row = waveform peak; Numbers of 0 in row = waveform trough; Basis of Sony's Direct Stream Digital (DSD)
Pulse Density Modulation
Morse Code
Nyquist Frequency
DVD-18
39. 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
SCMS
Claude Shannon
Buffer Size
Lossless
40. Multi-Bit Words; (Pulse Code Modulation)
PCM
Sawtooth Wave
AES3
Direct Stream Digital
41. Circuit that interprets the meaning of the symbols as they were chosen and arranged by the encode
Sony-Philips Digital Interface Format (S/PDIF)
Decoder
Quantization Intervals
Harry Nyquist
42. EDL; Final list of samples used in the audio editing process; Identified by time code
Edit Decision List
Pulse Code Modulation
PCM
Delta-Sigma Modulation
43. 12cm plastic disc; 1.2mm thick; One- sided; Red Laser; 1.6 microns between tracks; 125 nanometer pits
Fourier Series
Buffer Size
Stapedes Reflex
Red Book
44. Used when the reference pressure of a sound is 20 microPa (0.00002); Sound Pressure Level; Measure of amplitude
dB/SPL
Multichannel Audio Digital Interface (MADI)
Peak Level
Threshold of Hearing
45. A method of representing real numbers using a mantissa and an exponent
I/O Connection Buffering
Micron
Floating Point
Data Packing
46. MPEG; Standardizing body of audio coding
Zero-Latency Monitoring
SCMS
A/D Conversion
Motion Pictures Experts Group
47. The act of a frequency swinging back and forth with a steady - uninterrupted rhythm
Interpolation Filter
Jitter
Oscillation
Rarefaction
48. Visual graph that shows how loud a sound is at different frequencies
Sonogram
Lightpipe
DVD-14
Attenuation
49. 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
Morse Code
Lossless Formats
Headroom Bits
Nyquist Frequency
50. Subtract place values from the decimal number and place ones or zeros in the correct places
Latency
Decimal- to-Binary Conversion
Interleaved
Effective Bit Depth