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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. Sony and Philips optical disc format; Utilizes sigma delta DSD to offer higher resolution; 1- bit; 2.8224 MHz; 6-Channel
Sawtooth Wave
Peak Level
SACD
Sample Rate
2. A sample- by- sample operation on two signals
Convolution
dBFS
Buffering Locations
Anti-Imaging Filter
3. 7.95 GB; SS/DL
DVD-9
Delta-Sigma Modulation
Sampling (Samples)
Subbands
4. 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
Coaxial
Harmonic Content
Anti-Imaging Filter
Recording Levels
5. The loudest point of a Full Scale system
0 dB FS
Footroom
Threshold of Hearing
Frames
6. Defines the number of sample per second taken from a continuous signal to make a discrete signal; Governs the frequency response of digital audio
X-Axis Terminology
Frames
Sample Rate
Decimal- to-Binary Conversion
7. Serial Copy Management System; main difference between AES3 & S/PIDF
SCMS
Effective Bit Depth
SACD
Intensity Stereo
8. A digital filter's time domain output sequence when the input is a single sample is input
Impulse Response
Peak Level
Fourier Series
Perceptual Coding
9. Reference voltage determined by summing the voltage values of a predetermined number of previous samples; Numbers of 1 in row = waveform peak; Numbers of 0 in row = waveform trough; Basis of Sony's Direct Stream Digital (DSD)
Dolby 5.1
Delta-Sigma Modulation
Pulse Density Modulation
Stapedes Reflex
10. 12.33 GB; DS/ML
DVD-14
Successive Approximation
Intensity Stereo
Aliasing
11. Single- pin RCA cable or fiber- optic TOSLINK connector used for digital transfer; 75O coaxial - 2- channel unbalanced; 'Consumer' format of AES3
Speed of Sound
Codec
Equal Loudness Contour
Sony-Philips Digital Interface Format (S/PDIF)
12. Unit of measurement that is equal to one billionth of a meter
Nanometer
Inter-Channel Redundancy
Dithering
Threshold of Pain
13. The amount of energy at each wavelength
Pulse Density Modulation
Perceptual Coding
Decimation Filter
Spectra
14. Signal that uses variable voltage to create continuous waves resulting in an inexact transmission
PCM
Anti-Aliasing Filter
Analog
Glass Master
15. AES
Audio Engineering Society
Index of Reflectivity
Analog
Square Wave
16. Signal conversions are mixed with playback tracks resulting in near-zero latency
Direct Monitoring
EtherSound
Lossy
Impulse Response
17. 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)
Fletcher- Munson Curve
Speed of Sound
6 dB
Joseph Fourier
18. Voltage -> Dither -> Anti-Aliasing (Low Pass Filter) -> Sample & Hold Circuit -> Successive Approximation/Quantizer --) 100111010 (PCM Audio File)
Threshold of Hearing
Threshold of Pain
A/D Conversion Signal Flow
Morse Code
19. 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
Buffering
Voltage
Noise Shaping
Blu-Ray
20. 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
Dithering
AES3
Amplitude Accuracy
Nanometer
21. 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
Perceptual Coding
Pulse Code Modulation
DVD-Audio
Harmonic Content
22. A situation where a calculated value cannot fit into the number of digits reserved for it
Sample Rate Effect on Anti-Aliasing
Pulse Code Modulation
Logical Format
Overflow
23. 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
Aliasing
Lossless
Sine Wave
Noise Shaping
24. Splits the input signal and mixes it with an analog copy so that no latency is present
Zero-Latency Monitoring
2 Dimensions of Sound
DVD-14
TOSLINK
25. 12cm plastic disc; 1.2mm thick; One- sided; Red Laser; 1.6 microns between tracks; 125 nanometer pits
Fletcher- Munson Curve
Pulse Density Modulation
Quantization Error
Red Book
26. Have odd numbered harmonics
Pulse Width Modulation
Playback Buffering
Threshold of Hearing
Square Wave
27. How Loud (Y-Axis) & How Fast (X-Axis)
Lossy Formats
European Broadcasting Union
2 Dimensions of Sound
Buffering
28. Difference in brightness between land and pit on a CD Physical Format
Index of Reflectivity
Headroom Bits
Physical Disc Format
Pad Head & Tail
29. MPEG; Standardizing body of audio coding
Motion Pictures Experts Group
Harmonic Content
TOSLINK
DVD-9
30. Lossless Format; Can hold up to 25GB on a single- layer disc and 50GB on a dual- layer disc
Direct Stream Digital
Edit Decision List
Blu-Ray
Sample- and-Hold
31. 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
AoE Formats
Decimal- to-Binary Conversion
Peak Level
32. Digital (binary) measurements of how long each pulse is either on or off; Width of increasing voltage or decreasing voltage is assigned a 1 or 0 respectively
Pulse Width Modulation
Oversampling
M-S Stereo
Oversampling
33. Measure of the amplitude of a longitudinal wave
Bit Rate
Buffering Locations
Variable Bit Rate
Intensity
34. Sony sigma- delta modulation based technology that bypasses the decimation and interpolation steps found in PCM converters
Direct Stream Digital
Signal- to- Noise Ratio
Dolby 7.1
Frames
35. Having a repeated succession of waves or curves as in a sound waveform
CobraNet
Sinusoidal
Y-Axis Terminology
Aliasing
36. EBU
RMS Meter
Internal Resolution
European Broadcasting Union
Subbands
37. Waveform of a pure tone showing simple harmonic motion
Requirements for A/D Conversion
6 dB
Constant Bit Rate
Sine Wave
38. 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
Direct Monitoring
Intensity
Equal Loudness Contour
39. 'Capturing' part of digital audio; Never captures a signal perfectly
dBFS
Sine Wave
Blu-Ray
A/D Conversion
40. 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
DVD-Audio
Bit Depth
Sawtooth Wave
Footroom
41. Father of modern information theory; Solidified the Nyquist Theory by adding the concept that bits per second (binary representation of audio signals) must be at equal intervals to accurately represent data
CobraNet
Claude Shannon
Codec
Dolby 7.1
42. Visual graph that shows how loud a sound is at different frequencies
Algorithm
Sonogram
Spectrum Multiplication
SACD
43. Leaving space at beginning and ending of song for data crunching during mastering; Last step in mastering process
Sine Wave
Acoustics
Pad Head & Tail
Redither
44. Number of bits per second processed when sampling sound; (Sampling Rate x Bit Depth) = Resolution
Fidelity
Bit Rate
Square Wave
Analog
45. 8.75 GB; DS/SL
Frames
DVD-10
Analog
Playback Buffering
46. Take up half as many bits (50%); Algorithm can keep same quality by lossing the stereo track
Oversampling
Cutoff Frequency
Threshold of Hearing
MONO
47. A time regulator that makes all samples and bits to align when working with interconnected digital devices; Basically a signal that all of the digital devices refer to when operating.
Floating Point
Word Clock
DVD-5
AoE Formats
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
Quantization
Peak Level
Internal Resolution
49. 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
Bit Depth Effect on Dynamic Range
Sony-Philips Digital Interface Format (S/PDIF)
Oversampling
Pulse Code Modulation
50. A method of representing real numbers using a mantissa and an exponent
Floating Point
Glass Master
Storage Conversion Steps
CobraNet