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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. Sum of all harmonics; Sum of sine and cosine waves which have frequencies f - 2f - 3f - 4f...
Digital
Fourier Series
Algorithm
Requirements for A/D Conversion
2. Twice as many samples as the highest frequency at minimum; Sampling rate totally controls frequency response
Audio over Ethernet (AoE)
Sampling Rule
Y-Axis Terminology
Normalizing
3. Perceptual coding technique that uses louder sounds of a similar frequency to decide what information is to be saved during data reduction
Masking Analysis...
I/O Connection Buffering
Zero-Latency Monitoring
Quantization Intervals
4. Computer program or device capable of encoding and/or decoding a digital data stream with the end result being a reduced file size
Codec
Inter-Channel Redundancy
Redither
DVD-18
5. Same as 'aliasing'
Digital
Lossy
Bit Rate
Foldover
6. Branch of psychology concerned with the subjective perception of sound
Requirements for CD Audio
Psychoacoustics
Audio over Ethernet (AoE)
Masking Analysis...
7. 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
0 dB FS
Direct Stream Digital
SACD
Interpolation Filter
8. The mathematics - algorithms - and the techniques used to manipulate signals after they have been converted to digital form
Interleaved
Impulse Response
Digital Signal Processing
D/A Conversion
9. AES
Floating Point
Audio Engineering Society
Storage Conversion Steps
Joint Stereo
10. Sample Rate x Bit Depth x # of Channels
Blu-Ray
Non -Compressed Audio Data Rate Formula
SCMS
Square Wave
11. Increases or decreases the digital signal so that the loudest sample is brought up to 0dBfs; Uses all bits from dynamic range and makes it even from track to track
AES3
Normalizing
Fletcher- Munson Curve
Amplitude Accuracy
12. Allows for an internal sample rate at multiples of the input and output rates; Alleviates the need for steep 'brickwall' filters; Often combined with internal '1- bit' processing; Increases smoothing effect
Attenuation
Oversampling
A/D Conversion Signal Flow
RMS Meter
13. Contains all even and odd harmonics associated with a fundamental tone - making it a rich source for modeling other sounds; Amplitude of each overtone decreases exponentially as a ratio of the harmonic's frequency to that of the fundamental
Audio Engineering Society
Compression
Word Clock
Sawtooth Wave
14. Measure of the amplitude of a longitudinal wave
Lossless Formats
Intensity
Sample- and-Hold
Sine Wave
15. A situation where a calculated value cannot fit into the number of digits reserved for it
Oscillation
Overflow
Direct Monitoring
Sample Rate
16. 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
dB/SPL
Acoustics
Lossless
Lossy
17. 8- in/8- out on one cable; 25- pin D- sub connector
Digital
Dynamic Range
Tascam Digital Interface Format (TDIF)
Sampling Theorem
18. 15.9 GB; DS/DL
DVD-18
Threshold of Hearing
Low-Latency Monitoring
Sampling (Samples)
19. Unit of measurement that is equal to one millionth of a meter
Frequency
Audio over Ethernet (AoE)
Micron
Equal Loudness Contour
20. Number of bits per second processed when sampling sound; (Sampling Rate x Bit Depth) = Resolution
Frequency
Spectra
M-S Stereo
Bit Rate
21. Difference in brightness between land and pit on a CD Physical Format
Index of Reflectivity
Internal Resolution
Interleaved
Constant Bit Rate
22. The loudest point of a Full Scale system
X-Axis Terminology
0 dB FS
Pulse Density Modulation
Jitter
23. Snippets of time in which frequency analysis takes place in a perceptual codec
Lossless
Buffer Size
MONO
Frames
24. Multi-Bit Words; (Pulse Code Modulation)
Sinusoidal
Constant Bit Rate
Edit Decision List
PCM
25. If a signal is sampled at a rate higher than twice the highest significant signal frequency and at evenly spaced intervals - then the samples contain all the information of the original signal
Decimal- to-Binary Conversion
Successive Approximation
Blu-Ray
Sampling Theorem
26. CobraNet; EtherSound; Dante; AVB (currently under development)
AoE Formats
Dynamic Range
Signal- to- Noise Ratio
Motion Pictures Experts Group
27. Built into DAWs; Bits are added when signals are mixed together to avoid clipping
Anti-Aliasing Filter
Base 2 System
Gain Staging
Headroom Bits
28. Algorithm uses matrix of a mid/side microphone pair to determine a side signal & that signal is reduced then distributed as code in stereo
Sample Rate Effect on Anti-Aliasing
Quantization Intervals
Anti-Aliasing Filter
M-S Stereo
29. 8.75 GB; DS/SL
DVD-10
Audio over Ethernet (AoE)
Harry Nyquist
DVD-14
30. Digital and analog processing capability is combined on a single microchip allowing for 1- bit resolution at high sample rates
Pulse Code Modulation
Acoustics
Pulse Density Modulation
Delta-Sigma Modulation
31. 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
AoE Formats
Constant Bit Rate
Decoder
Blu-Ray
32. ADAT Optcal; 8- in/8- out on two cables; Fiber- optic - TOSLINK connector
Pass Band
Internal Resolution
Lightpipe
Sonogram
33. 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
Attenuation
Lossless Formats
Perceptual Coding
Photoreceptor
34. The difference in volume between the loudest and quietest sounds of a source
Dynamic Range
Aliasing
Anti-Imaging Filter
Joint Stereo
35. Splits the input signal and mixes it with an analog copy so that no latency is present
Oscillation
Zero-Latency Monitoring
Pass Band
Bit Depth Effect on Dynamic Range
36. Pertaining to hearing or sound; Combination of the intensity of air pressure molecules with amplitude
Bit Depth
Acoustics
Sampling Rule
Significand
37. 'Capturing' part of digital audio; Never captures a signal perfectly
Adaptive Pulse Code Modulation
dB/SPL
Algorithm
A/D Conversion
38. Unit of measurement that is equal to one billionth of a meter
Sample Rate Effect on Anti-Aliasing
DVD-10
Nanometer
Aliasing
39. High Pressure - Part of a longitudinal wave where the particles of the medium are close together
Nanometer
Delta-Sigma Modulation
Headroom Bits
Compression
40. Subtract place values from the decimal number and place ones or zeros in the correct places
Decimal- to-Binary Conversion
Acoustics
MONO
Recording Levels
41. When recording you want the smallest buffer available; When mixing you want the largest buffer available
Sine Wave
Pulse Code Modulation
Buffer Size
Effective Bit Depth
42. The ability of a digital system to perform complex DSP without running into problems with overflow or loss of resolution
Y-Axis Terminology
6 dB
Rarefaction
Internal Resolution
43. 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)
Word Clock
European Broadcasting Union
Sample- and-Hold
44. Lossless Format; Can hold up to 25GB on a single- layer disc and 50GB on a dual- layer disc
Equal Loudness Contour
Word Clock
Noise Shaping
Blu-Ray
45. Occurs as data is assembled into meaningful bits or information and as left & right channels are separated
SACD
I/O Connection Buffering
Anti-Aliasing Filter
Requirements for CD Audio
46. Based on Full Scale (dB/FS); -6dB represents a loss of one bit so account for this when calculating
Claude Shannon
Additive Synthesis...
Effective Bit Depth
Significand
47. Anytime bit depth is reduced the gap gets bigger so more dithering is required
Redither
Logical Format
Harmonic Content
dBFS
48. 12.33 GB; DS/ML
Intensity
Conversion Buffering
Cutoff Frequency
DVD-14
49. Six channel (five speakers and one subwoofer for bass) digital surround sound system by Dolby
Optical Cable
Dolby 5.1
Perceptual Coding
Quantization Error
50. Apple Lossless; Windows Media Lossless; DTS HD Master Audio; Dolby True HD; FLAC
Lossless Formats
Transfer Protocol
Sonogram
Gain Staging