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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. 15.9 GB; DS/DL
Nyquist Frequency
DVD-18
Fourier Series
Average Bit Rate
2. 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
Inter-Channel Redundancy
Sinusoidal
Pulse Code Modulation
Cutoff Frequency
3. Softest sound that can be heard by the average human ear (0 dB)
Threshold of Hearing
Glass Master
Analog
Pad Head & Tail
4. 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
Impulse Response
Nanometer
Inter-Channel Redundancy
Interpolation Filter
5. Low Pressure; Part in a longitudinal wave where the particles are spread apart
Equal Loudness Contour
Rarefaction
Audio over Ethernet (AoE)
Index of Reflectivity
6. The process of reducing the space required to store data by efficiently encoding the content.
Successive Approximation
Threshold of Hearing
Compression
Coaxial
7. A network communications protocol that specifies how machines will exchange data; Uses a broadcast system in which one machine transmits its message on the communication medium and the other machines listen for messages directed to them
Significand
Attenuation
Ethernet
M-S Stereo
8. Method of representing an acoustic quantity with a series of binary numbers; Can have only specific individually distinct values
Blu-Ray
Oversampling
X-Axis Terminology
Digital
9. Computer program or device capable of encoding and/or decoding a digital data stream with the end result being a reduced file size
Overflow
Latency
dB/FS
Codec
10. The difference between the analog value and the approximated digital value due to the 'rounding' that occurs while converting the analog signal to digital
Gain Staging
Quantization Error
Pass Band
Acoustics
11. Ratio of magnitude of the analytical signal to the magnitude of the background noise signal
Subbands
Signal- to- Noise Ratio
I/O Connection Buffering
X-Axis Terminology
12. Measure of the amplitude of a longitudinal wave
dB/FS
Intensity
Pass Band
Normalizing
13. RAM holds in memory audio data before it is transferred to the memory controller; Certain amount of data is processed before large amounts of data are streamed to prevent latency
Quantization Error
Spectra
Frames
Buffering
14. Sony and Philips optical disc format; Utilizes sigma delta DSD to offer higher resolution; 1- bit; 2.8224 MHz; 6-Channel
Bit Depth Effect on Dynamic Range
Physical Disc Format
SACD
Intensity Stereo
15. Number or variable that represents the number of times the base of a power is used as a factor; Defines magnitude
Frequency
CPU Buffering
DVD-Audio
Exponent
16. 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
Additive Synthesis...
Stapedes Reflex
Average Bit Rate
17. Snippets of time in which frequency analysis takes place in a perceptual codec
D/A Conversion
Threshold of Pain
Convolution
Frames
18. Voltage -> Dither -> Anti-Aliasing (Low Pass Filter) -> Sample & Hold Circuit -> Successive Approximation/Quantizer --) 100111010 (PCM Audio File)
A/D Conversion Signal Flow
RMS
Physical Disc Format
Constant Bit Rate
19. Apple Lossless; Windows Media Lossless; DTS HD Master Audio; Dolby True HD; FLAC
Voltage
Bit Depth Effect on Dynamic Range
Lossless Formats
Perceptual Coding
20. The continuous loss of signal strengths as a signal travels through a medium
Adaptive Pulse Code Modulation
Attenuation
Oversampling
Optical Cable
21. Level above which audible sounds are painful (125 - 130 db)
Average Bit Rate
Internal Resolution
Threshold of Pain
Motion Pictures Experts Group
22. 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
Threshold of Hearing
Sawtooth Wave
Base 2 System
23. Smallest interval measurable by a scientific instrument; Defined by bit rate (sample rate x bit depth)
Index of Reflectivity
Resolution
Lossless
Bit Depth
24. The act of a frequency swinging back and forth with a steady - uninterrupted rhythm
Oscillation
Claude Shannon
Psychoacoustics
Compression
25. Multi-Bit Words; (Pulse Code Modulation)
Exponent
PCM
Nyquist Frequency
Bit Depth Effect on Dynamic Range
26. 8- in/8- out on one cable; 25- pin D- sub connector
Sampling Rule
Optical Cable
Tascam Digital Interface Format (TDIF)
Bit Depth
27. Reduces A/D sample rate from the oversampled rate to nominal rate by turning series of one- bit samples into a series of multi- bit PCM samples; (ex. => 2.8MHz sample rate converted to 44.1kHz and simultaneously converts 1-Bit samples to multi- bit);
Audio over Ethernet (AoE)
Anti-Imaging Filter
Subbands
Decimation Filter
28. Splits the input signal and mixes it with an analog copy so that no latency is present
Class - D Amplifier
Sony-Philips Digital Interface Format (S/PDIF)
Coaxial
Zero-Latency Monitoring
29. Cable used to transmit data; Inner cable is surrounded by a plastic insulator - which is surrounded by a wire mesh conductor that insulates the internal signal wire from external interference and an outer casing that functions as a ground
Edit Decision List
Coaxial
Quantization
Glass Master
30. 1.) Taking a series of evenly- spaced measurements 2.) Signal contains no frequency components higher than half the sample rate
Exponent
Convolution
Requirements for A/D Conversion
Buffering
31. A method of representing real numbers using a mantissa and an exponent
Joint Stereo
Floating Point
DVD-10
Threshold of Pain
32. The ability of a digital system to perform complex DSP without running into problems with overflow or loss of resolution
Threshold of Pain
Internal Resolution
Fidelity
Pulse Width Modulation
33. CobraNet; EtherSound; Dante; AVB (currently under development)
Voltage
Bit Depth Effect on Dynamic Range
DVD-5
AoE Formats
34. Unit of measurement that is equal to one millionth of a meter
Dolby 7.1
Micron
0 dB FS
Interpolation Filter
35. Take up half as many bits (50%); Algorithm can keep same quality by lossing the stereo track
2 Dimensions of Sound
Codec
Stapedes Reflex
MONO
36. Uses entropy coding as the basis; Computer data compression algorithm that packages files such as .ZIP & .RAR
Sample- and-Hold
Data Packing
Decimal- to-Binary Conversion
Digital
37. 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
Anti-Aliasing Filter
D/A Conversion
Claude Shannon
38. Describes acceptable data - performances both offered and essential for a disc player - and the complete user experience
Sine Wave
Joseph Fourier
Logical Format
Internal Resolution
39. 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
Oversampling
Analog
Decimation Filter
Sample Rate Effect on Anti-Aliasing
40. 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
Blu-Ray
Normalizing
Perceptual Coding
Rarefaction
41. Playback; I/O Connections; CPU (Streaming); Conversion from DAW or Software
Buffering Locations
Voltage
Optical Cable
X-Axis Terminology
42. 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)
Speed of Sound
Anti-Imaging Filter
Quantizer
43. Number of bits used to represent the smallest unit of information in an audio file; Greater bit depth = better quality audio
Significand
Speed of Sound
Bit Depth
Logical Format
44. 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
Gain Staging
Playback Buffering
PCM
Lossless Formats
45. Ultra low- latency - 512- channel (on a gigabit network) - less flexible AoE format; Routed like audio cables...not network cables
EtherSound
Buffering Locations
dBFS
D/A Conversion
46. Branch of psychology concerned with the subjective perception of sound
DVD-9
Psychoacoustics
Buffering Locations
Interpolation Filter
47. Built into DAWs; Bits are added when signals are mixed together to avoid clipping
Decimation Filter
Requirements for A/D Conversion
Headroom Bits
CobraNet
48. Process of building a complex tone by starting with the fundamental frequency and adding pure tone harmonics
Anti-Aliasing Filter
Spectra
Dolby 7.1
Additive Synthesis...
49. More aggressive lossy data reduction techniques that require further manipulation of the stereo field; Examples are 'Intensity' & 'M-S'
Significand
Joint Stereo
Oversampling
AES3
50. (AES/EBU); 110O - 2- channel balanced digital audio cable with an XLR connection; NOT a mic cable!!
dB/SPL
Resolution
AES3
Sony-Philips Digital Interface Format (S/PDIF)