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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. Based on Full Scale (dB/FS); -6dB represents a loss of one bit so account for this when calculating
Subbands
Quantization
Effective Bit Depth
DVD-Audio
2. Roughly around 1 -130 ft/s
Red Book
Joseph Fourier
Threshold of Pain
Speed of Sound
3. Serial Copy Management System; main difference between AES3 & S/PIDF
Data Packing
Equal Loudness Contour
Anti-Aliasing Filter
SCMS
4. Inner ear component that attaches to the stapes and helps to decrease the amplitude of vibrations; Causes the masking phenomenon
Stapedes Reflex
DVD-Audio
Lossless
Claude Shannon
5. Softest sound that can be heard by the average human ear (0 dB)
Sampling Theorem
2 Dimensions of Sound
Resolution
Threshold of Hearing
6. 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
Cutoff Frequency
Glass Master
Harmonic Content
Quantization Intervals
7. EDL; Final list of samples used in the audio editing process; Identified by time code
Ethernet
Edit Decision List
PCM
D/A Conversion
8. The act of a frequency swinging back and forth with a steady - uninterrupted rhythm
SCMS
Oscillation
Aliasing
DVD-9
9. CobraNet; EtherSound; Dante; AVB (currently under development)
2 Dimensions of Sound
Resolution
Audio Engineering Society
AoE Formats
10. 'Reconstructing' part of digital audio
Joint Stereo
Floating Point
D/A Conversion
Aliasing
11. Unit of measurement that is equal to one millionth of a meter
Bit Rate
Nanometer
Threshold of Pain
Micron
12. Joint-Stereo Technique; Since the human brain is unable to localize sounds at high frequencies well sounds above 9 kHz threshold are encoded in mono
Intensity Stereo
Spectra
Buffering
Threshold of Hearing
13. Digital Word -> Series of Resistors (each with assigned charges) -> Sample- and-Hold Circuit -> Anti-Imaging Filter (Smoothing Filter) -> Reconstructed Sample
Word Clock
D/A Conversion Signal Flow
Intensity Stereo
Signal- to- Noise Ratio
14. Found that aliasing was always a problem no matter how fast you sample; Less data recorded but more accurate; 2 samples per wave length.
Harry Nyquist
Perceptual Coding
Footroom
Adaptive Pulse Code Modulation
15. The frequency range that is allowed through a filter
Analog
Sawtooth Wave
Pass Band
Requirements for A/D Conversion
16. The difference in volume between the loudest and quietest sounds of a source
Dynamic Range
Digital Signal Processing
Intensity
Word Clock
17. Very selective method of lowering buffer levels by halting different levels of audio processing
Blu-Ray
Acoustics
Bit Rate
Low-Latency Monitoring
18. ADPCM; Pulse code modulation that produces a digital signal with a lower bit rate than standard PCM; Records only the difference between samples
Internal Resolution
Average Bit Rate
Adaptive Pulse Code Modulation
Requirements for A/D Conversion
19. Measures the highest levels of a signal being recorded or mixed; Monitors for clipping - which occurs at 0dBFS); Does not always reflect perceived volume of signal
M-S Stereo
Glass Master
Peak Level
Intensity Stereo
20. Twice as many samples as the highest frequency at minimum; Sampling rate totally controls frequency response
Voltage
Sampling Rule
Pass Band
Blu-Ray
21. 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
CPU Buffering
RMS Meter
D/A Conversion Signal Flow
Voltage
22. Method of representing an acoustic quantity with a series of binary numbers; Can have only specific individually distinct values
Joseph Fourier
Digital
Internal Resolution
Entropy Coding
23. The elapsed time it takes for a packet of data to arrive at its destination; Lagging or pause of an audio signal as digital processing occurs; Can be managed utilizing several forms of 'audio monitoring'
TOSLINK
Dolby 5.1
Latency
Constant Bit Rate
24. (Time Based) Frequency: Aliasing; Anti-Aliasing Filter; Sample Rate; Nyquist Limit
Sampling Theorem
Lightpipe
X-Axis Terminology
Sample Rate
25. Mixing data and control characters in a single operation
Harry Nyquist
Interleaved
Psychoacoustics
Joseph Fourier
26. A digital filter's time domain output sequence when the input is a single sample is input
Sine Wave
Impulse Response
PCM
Direct Stream Digital
27. A frequency specified for a filter (digital or electronic) the marks the point at which the frequency content of a signal is altered +/- 3dB
Cutoff Frequency
Signal- to- Noise Ratio
Morse Code
Red Book
28. 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
Successive Approximation
Average Bit Rate
Impulse Response
Buffering Locations
29. 15.9 GB; DS/DL
Signal- to- Noise Ratio
Lossless Formats
DVD-18
Class - D Amplifier
30. Eliminates frequencies above the Nyquist limit from becoming samples; Occurs prior to quantization
Anti-Aliasing Filter
Threshold of Pain
Variable Bit Rate
M-S Stereo
31. Splits the input signal and mixes it with an analog copy so that no latency is present
Significand
Successive Approximation
Zero-Latency Monitoring
Harry Nyquist
32. Number of bits used to represent the smallest unit of information in an audio file; Greater bit depth = better quality audio
Perceptual Coding
Word Clock
Base 2 System
Bit Depth
33. Discrete incremental distinctions made between the value of one sample and the next; Breaks down bit depth into a series of evenly spaced intervals
Gain Staging
Square Wave
Quantization Intervals
Stapedes Reflex
34. Anytime bit depth is reduced the gap gets bigger so more dithering is required
Quantization Intervals
Redither
Buffering Locations
Psychoacoustics
35. Algorithm uses matrix of a mid/side microphone pair to determine a side signal & that signal is reduced then distributed as code in stereo
Glass Master
RMS
M-S Stereo
Digital Signal Processing
36. 'Capturing' part of digital audio; Never captures a signal perfectly
Oscillation
DVD-14
Threshold of Pain
A/D Conversion
37. Waveform of a pure tone showing simple harmonic motion
Sine Wave
Playback Buffering
Sampling Theorem
Tascam Digital Interface Format (TDIF)
38. Number or variable that represents the number of times the base of a power is used as a factor; Defines magnitude
Conversion Buffering
Blu-Ray
Exponent
Threshold of Hearing
39. Computer program or device capable of encoding and/or decoding a digital data stream with the end result being a reduced file size
Interpolation Filter
Lossy Formats
Codec
Harry Nyquist
40. 1st commercially successful AoE format for the transmission of digital audio - video - and control signals over 64- channel 100Mbps Ethernet networks
Effective Bit Depth
Impulse Response
CobraNet
Normalizing
41. Snippets of time in which frequency analysis takes place in a perceptual codec
Anti-Imaging Filter
Zero-Latency Monitoring
Redither
Frames
42. 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
Intensity Stereo
Lossy
DVD-18
Quantization Error
43. Lossless Format; Can hold up to 25GB on a single- layer disc and 50GB on a dual- layer disc
Fourier Series
Micron
Blu-Ray
Sampling Rule
44. 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
Variable Bit Rate
SACD
Dithering
Anti-Aliasing Filter
45. Single- pin RCA cable or fiber- optic TOSLINK connector used for digital transfer; 75O coaxial - 2- channel unbalanced; 'Consumer' format of AES3
Lossless Formats
Variable Bit Rate
Sony-Philips Digital Interface Format (S/PDIF)
Index of Reflectivity
46. EBU
Floating Point
Stapedes Reflex
European Broadcasting Union
Blu-Ray
47. 8.75 GB; DS/SL
Low-Latency Monitoring
TOSLINK
Effective Bit Depth
DVD-10
48. 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
Sample Rate Effect on Anti-Aliasing
RMS
Blu-Ray
SCMS
49. Low Pressure; Part in a longitudinal wave where the particles are spread apart
Storage Conversion Steps
Equal Loudness Contour
Pulse Width Modulation
Rarefaction
50. High Pressure - Part of a longitudinal wave where the particles of the medium are close together
Compression
I/O Connection Buffering
PCM
Cutoff Frequency