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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. French mathematician that noted that any complex sound can be broken down into a series of component pure tones
AoE Formats
Joseph Fourier
Oversampling
Amplitude Accuracy
2. 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
RMS
Intensity
Buffering
Jitter
3. Roughly around 1 -130 ft/s
Speed of Sound
Delta-Sigma Modulation
Compression
Playback Buffering
4. Splits the input signal and mixes it with an analog copy so that no latency is present
Zero-Latency Monitoring
Footroom
Successive Approximation
Fletcher- Munson Curve
5. A method of representing real numbers using a mantissa and an exponent
Tascam Digital Interface Format (TDIF)
Sonogram
Floating Point
Harry Nyquist
6. Same as 'aliasing'
Storage Conversion Steps
Foldover
Sine Wave
Compression
7. Based on Full Scale (dB/FS); -6dB represents a loss of one bit so account for this when calculating
Exponent
Jitter
Constant Bit Rate
Effective Bit Depth
8. Defines the number of sample per second taken from a continuous signal to make a discrete signal; Governs the frequency response of digital audio
Anti-Aliasing Filter
Psychoacoustics
Sample Rate
Algorithm
9. 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
Average Bit Rate
Sony-Philips Digital Interface Format (S/PDIF)
A/D Conversion
X-Axis Terminology
10. Toshiba developed digital audio interface utilizes fiber optics as a transmission medium.
Lightpipe
TOSLINK
Rarefaction
AoE Formats
11. Low Pressure; Part in a longitudinal wave where the particles are spread apart
Rarefaction
Sampling Rule
dB/FS
A/D Conversion Signal Flow
12. Eight channel digital surround sound system by Dolby
Anti-Imaging Filter
6 dB
DVD-9
Dolby 7.1
13. 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
Bit Depth
Sampling Theorem
Low-Latency Monitoring
Frequency
14. The loudest point of a Full Scale system
RMS
Threshold of Pain
Micron
0 dB FS
15. EDL; Final list of samples used in the audio editing process; Identified by time code
Square Wave
Edit Decision List
Sony-Philips Digital Interface Format (S/PDIF)
TOSLINK
16. Allowance of noise floor below that which is required for the final product
Anti-Aliasing Filter
Footroom
Y-Axis Terminology
Bit Depth Effect on Dynamic Range
17. High channel count; 64 channels on one cable; Coaxial cable with BNC connector or fiber optic with ST1 connector
Multichannel Audio Digital Interface (MADI)
Playback Buffering
Dithering
Edit Decision List
18. DAW's and software must buffer when converting or bouncing and this latency can add up if not monitored
DVD-10
Exponent
Conversion Buffering
Psychoacoustics
19. A frequency specified for a filter (digital or electronic) the marks the point at which the frequency content of a signal is altered +/- 3dB
Lossless
Significand
Cutoff Frequency
Physical Disc Format
20. Algorithm uses matrix of a mid/side microphone pair to determine a side signal & that signal is reduced then distributed as code in stereo
Storage Conversion Steps
Codec
M-S Stereo
Signal- to- Noise Ratio
21. Industry Standards: -6 dB Peak = -20 RMS Meter
dB/SPL
Inter-Channel Redundancy
Exponent
Recording Levels
22. Unit of measurement that is equal to one millionth of a meter
Analog
Micron
Gain Staging
DVD-Audio
23. Signal conversions are mixed with playback tracks resulting in near-zero latency
Direct Monitoring
Dithering
Blu-Ray
Sonogram
24. Softest sound that can be heard by the average human ear (0 dB)
Overflow
Threshold of Hearing
Recording Levels
Quantization
25. Digital Word -> Series of Resistors (each with assigned charges) -> Sample- and-Hold Circuit -> Anti-Imaging Filter (Smoothing Filter) -> Reconstructed Sample
D/A Conversion Signal Flow
Nyquist Frequency
Pulse Width Modulation
Bit Rate
26. CobraNet; EtherSound; Dante; AVB (currently under development)
Logical Format
AoE Formats
Bit Depth Effect on Dynamic Range
Noise Shaping
27. Sony and Philips optical disc format; Utilizes sigma delta DSD to offer higher resolution; 1- bit; 2.8224 MHz; 6-Channel
DVD-18
SACD
Ethernet
Significand
28. The frequency range that is allowed through a filter
X-Axis Terminology
Compression
Successive Approximation
Pass Band
29. The mathematics - algorithms - and the techniques used to manipulate signals after they have been converted to digital form
Harmonic Content
Decimal- to-Binary Conversion
Micron
Digital Signal Processing
30. Sum of all harmonics; Sum of sine and cosine waves which have frequencies f - 2f - 3f - 4f...
Fourier Series
Pulse Density Modulation
Quantization Error
Entropy Coding
31. HD Audio format; Lossless Compression; 24- bit/96 kHz; 5.1 Surround or 24- bit / 192 kHz stereo sound
DVD-Audio
AoE Formats
Motion Pictures Experts Group
Transfer Protocol
32. 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
Overflow
Compression
Inter-Channel Redundancy
33. Method of representing an acoustic quantity with a series of binary numbers; Can have only specific individually distinct values
Digital
M-S Stereo
Amplitude Accuracy
2 Dimensions of Sound
34. Describes acceptable data - performances both offered and essential for a disc player - and the complete user experience
Dolby 5.1
Effective Bit Depth
Logical Format
Entropy Coding
35. Level above which audible sounds are painful (125 - 130 db)
Threshold of Pain
Quantization Intervals
Dolby 5.1
Noise Shaping
36. 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
Subbands
Storage Conversion Steps
M-S Stereo
Base 2 System
37. Multi-Bit Words; (Pulse Code Modulation)
PCM
Foldover
Sawtooth Wave
Inter-Channel Redundancy
38. Unit of measurement that is equal to one billionth of a meter
Nanometer
Joseph Fourier
Anti-Imaging Filter
Adaptive Pulse Code Modulation
39. Circuit that seizes voltage values with each tick of an A/D device's internal clock
Sample- and-Hold
Tascam Digital Interface Format (TDIF)
dBFS
Decoder
40. Accuracy with which an electronic system reproduces the sound or image of its input signal
Sampling Theorem
Internal Resolution
Fidelity
Sample Rate
41. 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
Sony-Philips Digital Interface Format (S/PDIF)
Threshold of Pain
Lossy
Sample- and-Hold
42. A situation where a calculated value cannot fit into the number of digits reserved for it
Overflow
CPU Buffering
Sine Wave
Joseph Fourier
43. Waveform of a pure tone showing simple harmonic motion
Sample Rate
Latency
Anti-Aliasing Filter
Sine Wave
44. Take up half as many bits (50%); Algorithm can keep same quality by lossing the stereo track
Conversion Buffering
Masking Analysis...
Optical Cable
MONO
45. Overtones that contribute to the timbre of a sound and make up a complex waveform's physical characteristics
6 dB
Harmonic Content
dBFS
Lossy Formats
46. AES
Audio Engineering Society
Analog
SACD
Digital
47. 15.9 GB; DS/DL
Pulse Density Modulation
DVD-18
Subbands
Sine Wave
48. 1st commercially successful AoE format for the transmission of digital audio - video - and control signals over 64- channel 100Mbps Ethernet networks
CobraNet
Buffering Locations
Motion Pictures Experts Group
Direct Stream Digital
49. 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
RMS
Variable Bit Rate
Pulse Width Modulation
Threshold of Pain
50. 8- in/8- out on one cable; 25- pin D- sub connector
Internal Resolution
Tascam Digital Interface Format (TDIF)
Square Wave
Ethernet