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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. Measure of sound pressure over the frequency spectrum - for which a listener perceives a constant loudness when presented with pure steady tones
Delta-Sigma Modulation
Equal Loudness Contour
Sample- and-Hold
DVD-14
2. Digital Word -> Series of Resistors (each with assigned charges) -> Sample- and-Hold Circuit -> Anti-Imaging Filter (Smoothing Filter) -> Reconstructed Sample
Sinusoidal
D/A Conversion Signal Flow
Buffering
Physical Disc Format
3. Process of building a complex tone by starting with the fundamental frequency and adding pure tone harmonics
Compression
Additive Synthesis...
Convolution
Redither
4. 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
Pulse Code Modulation
Sample Rate Effect on Anti-Aliasing
Cutoff Frequency
Speed of Sound
5. The difference in volume between the loudest and quietest sounds of a source
Dolby 7.1
Dynamic Range
Algorithm
SCMS
6. ADAT Optcal; 8- in/8- out on two cables; Fiber- optic - TOSLINK connector
Lightpipe
Signal- to- Noise Ratio
Masking Analysis...
Digital Signal Processing
7. Perceptual coding technique that uses louder sounds of a similar frequency to decide what information is to be saved during data reduction
Sawtooth Wave
Transfer Protocol
Masking Analysis...
Quantization Intervals
8. EDL; Final list of samples used in the audio editing process; Identified by time code
Fourier Series
Direct Stream Digital
Red Book
Edit Decision List
9. Rate at which energy is drawn from a source that produces a flow of electricity in a circuit; Expressed in volts
Quantizer
Audio over Ethernet (AoE)
SCMS
Voltage
10. 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
Decoder
Threshold of Hearing
Intensity Stereo
I/O Connection Buffering
11. Used when the reference pressure of a sound is 20 microPa (0.00002); Sound Pressure Level; Measure of amplitude
dB/SPL
Acoustics
Quantizer
Sinusoidal
12. Single- pin RCA cable or fiber- optic TOSLINK connector used for digital transfer; 75O coaxial - 2- channel unbalanced; 'Consumer' format of AES3
A/D Conversion
A/D Conversion Signal Flow
Threshold of Hearing
Sony-Philips Digital Interface Format (S/PDIF)
13. Stores only one copy of a stereo signal and assigns it to both channels in order to save 50% of original bandwidth
Inter-Channel Redundancy
Pulse Code Modulation
Adaptive Pulse Code Modulation
Lightpipe
14. 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
dB/FS
Data Packing
Dolby 5.1
Jitter
15. 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
Storage Conversion Steps
Constant Bit Rate
Requirements for A/D Conversion
Coaxial
16. 'Capturing' part of digital audio; Never captures a signal perfectly
Sine Wave
A/D Conversion
Blu-Ray
Blu-Ray
17. Playback; I/O Connections; CPU (Streaming); Conversion from DAW or Software
Decimation Filter
Lossless Formats
Buffering Locations
Significand
18. Uses entropy coding as the basis; Computer data compression algorithm that packages files such as .ZIP & .RAR
Data Packing
Physical Disc Format
CobraNet
dB/SPL
19. Having a repeated succession of waves or curves as in a sound waveform
Glass Master
Recording Levels
Sinusoidal
Edit Decision List
20. The frequency range that is allowed through a filter
Stapedes Reflex
Noise Shaping
Equal Loudness Contour
Pass Band
21. Ultra low- latency - 512- channel (on a gigabit network) - less flexible AoE format; Routed like audio cables...not network cables
EtherSound
Lossy Formats
dBFS
Dolby 5.1
22. Have odd numbered harmonics
Square Wave
AES3
Compression
DVD-9
23. Method of representing an acoustic quantity with a series of binary numbers; Can have only specific individually distinct values
Coaxial
Bit Depth Effect on Dynamic Range
Logical Format
Digital
24. Defines the number of sample per second taken from a continuous signal to make a discrete signal; Governs the frequency response of digital audio
Threshold of Hearing
Significand
Conversion Buffering
Sample Rate
25. 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
Spectra
Masking Analysis...
Average Bit Rate
Morse Code
26. Represents the amplitude component of the digital sampling process; Technique of incrementing a continuous analog event into a discrete set of binary digits (bits)
Quantization
Quantizer
Fidelity
Pass Band
27. Measure of the amplitude of a longitudinal wave
Voltage
Entropy Coding
Intensity
Equal Loudness Contour
28. Unit of measurement that is equal to one billionth of a meter
Anti-Imaging Filter
Nanometer
Compression
Lossy Formats
29. The frequency above or below which attenuation begins in a filter circuit
Amplitude Accuracy
Cutoff Frequency
Constant Bit Rate
Rarefaction
30. Multi-Bit Words; (Pulse Code Modulation)
PCM
Adaptive Pulse Code Modulation
Signal- to- Noise Ratio
Buffering
31. Eliminates frequencies above the Nyquist limit from becoming samples; Occurs prior to quantization
Lossy
Masking Analysis...
Interpolation Filter
Anti-Aliasing Filter
32. Also known as equal loudness curves; Graph that indicates the average ear sensitivity to different frequencies at different SPL levels (as volume increases - these curves flatten out)
Bit Depth
Fletcher- Munson Curve
Quantizer
Anti-Aliasing Filter
33. High Pressure - Part of a longitudinal wave where the particles of the medium are close together
Direct Stream Digital
Compression
Lightpipe
X-Axis Terminology
34. Allowance of noise floor below that which is required for the final product
Quantization Error
Footroom
DVD-9
Quantizer
35. 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
Lossless
Normalizing
Stapedes Reflex
Logical Format
36. 16-Bit; 44.1 kHz; PCM; Stereo
Overflow
Requirements for CD Audio
Dynamic Range
Sawtooth Wave
37. Fractional part of a floating- point number; Also called the mantissa; Defines precision
Sinusoidal
Significand
Decimal- to-Binary Conversion
CobraNet
38. Describes acceptable data - performances both offered and essential for a disc player - and the complete user experience
Spectrum Multiplication
Intensity
Logical Format
SACD
39. Samples are duplicated and the playback sampling rate correspondingly increased; Significantly raises the Nyquist limit to a range well beyond human hearing; Processing 'pushes' the distortion resulting from quantization error into these higher frequ
Noise Shaping
Blu-Ray
Sample Rate
Peak Level
40. The difference between the analog value and the approximated digital value due to the 'rounding' that occurs while converting the analog signal to digital
Codec
Nyquist Frequency
Aliasing
Quantization Error
41. Based on Full Scale (dB/FS); -6dB represents a loss of one bit so account for this when calculating
Codec
Quantization Error
Effective Bit Depth
Word Clock
42. How Loud (Y-Axis) & How Fast (X-Axis)
2 Dimensions of Sound
Spectrum Multiplication
Class - D Amplifier
Coaxial
43. The ability of a digital system to perform complex DSP without running into problems with overflow or loss of resolution
Pass Band
Internal Resolution
Red Book
Joint Stereo
44. Ratio of magnitude of the analytical signal to the magnitude of the background noise signal
Y-Axis Terminology
Signal- to- Noise Ratio
Photoreceptor
Masking Analysis...
45. 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
Data Packing
Peak Level
D/A Conversion Signal Flow
Photoreceptor
46. The set of rules that computers use to move files from one computer to another on an internet
Transfer Protocol
Peak Level
Dolby 5.1
M-S Stereo
47. HD Audio format; Lossless Compression; 24- bit/96 kHz; 5.1 Surround or 24- bit / 192 kHz stereo sound
DVD-Audio
Base 2 System
Harmonic Content
Floating Point
48. French mathematician that noted that any complex sound can be broken down into a series of component pure tones
Harry Nyquist
Data Packing
Bit Rate
Joseph Fourier
49. 'Reconstructing' part of digital audio
D/A Conversion
Lossless
Micron
Quantization Error
50. 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
Lossless
Audio over Ethernet (AoE)
Normalizing