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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. 8.75 GB; DS/SL
Physical Disc Format
DVD-10
Buffering
Data Packing
2. Based on psychoacoustics - these are the basis of frequency analysis for a perceptual codec;
Harmonic Content
Morse Code
Bit Depth
Subbands
3. AES
Coaxial
Nanometer
2 Dimensions of Sound
Audio Engineering Society
4. 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
Variable Bit Rate
Spectra
Normalizing
M-S Stereo
5. Occurs as data is assembled into meaningful bits or information and as left & right channels are separated
EtherSound
Conversion Buffering
I/O Connection Buffering
Sample Rate
6. EBU
Direct Stream Digital
Cutoff Frequency
European Broadcasting Union
Requirements for CD Audio
7. Defines the number of sample per second taken from a continuous signal to make a discrete signal; Governs the frequency response of digital audio
Pulse Density Modulation
Sonogram
Convolution
Sample Rate
8. Algorithm uses matrix of a mid/side microphone pair to determine a side signal & that signal is reduced then distributed as code in stereo
Joseph Fourier
Threshold of Pain
Significand
M-S Stereo
9. Root Mean Square; Refers to taking the square root of all instantaneous amplitudes; Takes the average of those squares; (-6 Peak Level is approximately equal to -20 RMS)
Bit Rate
Y-Axis Terminology
Normalizing
RMS
10. Serial Copy Management System; main difference between AES3 & S/PIDF
Quantization Error
SCMS
Recording Levels
Average Bit Rate
11. 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'
Voltage
Latency
TOSLINK
Frequency
12. The frequency range that is allowed through a filter
Pass Band
Attenuation
Recording Levels
D/A Conversion
13. Allowance of noise floor below that which is required for the final product
Dithering
Nyquist Frequency
Footroom
Oscillation
14. 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);
Lightpipe
Codec
Decimation Filter
Nyquist Frequency
15. Lossless Format; Can hold up to 25GB on a single- layer disc and 50GB on a dual- layer disc
Oversampling
Audio over Ethernet (AoE)
Stapedes Reflex
Blu-Ray
16. A drive that can read and write on optical media that hold up to 50 GB on two layers; 24- bit/96 kHz for 8-Channel; 24- bit/192 kHz for 6-Channel
Aliasing
2 Dimensions of Sound
Blu-Ray
Successive Approximation
17. (Amplitude Based) Amplitude: Voltage; Quantization; Bit Depth; Quantization Intervals; Quantization Noise; [Signal:Quantization Noise Ratio]; Dither; Dynamic Range
Sine Wave
Sampling Theorem
Y-Axis Terminology
Blu-Ray
18. 1.) Taking a series of evenly- spaced measurements 2.) Signal contains no frequency components higher than half the sample rate
Edit Decision List
Data Packing
Requirements for A/D Conversion
Oversampling
19. Each bit in the bit depth is equal to a _____ increase in dynamic range
Harmonic Content
MONO
6 dB
Oversampling
20. Very selective method of lowering buffer levels by halting different levels of audio processing
Low-Latency Monitoring
X-Axis Terminology
Logical Format
Threshold of Hearing
21. Having a repeated succession of waves or curves as in a sound waveform
Frames
Sinusoidal
Interleaved
Anti-Aliasing Filter
22. Difference in brightness between land and pit on a CD Physical Format
Quantization Intervals
Compression
Index of Reflectivity
Base 2 System
23. Represents the amplitude component of the digital sampling process; Technique of incrementing a continuous analog event into a discrete set of binary digits (bits)
Buffer Size
DVD-Audio
Coaxial
Quantization
24. The act of a frequency swinging back and forth with a steady - uninterrupted rhythm
Logical Format
Audio Engineering Society
Oscillation
Spectrum Multiplication
25. Governs the frequency response of a digital system; The highest- frequency component that can be captured with a sampling rate; always 1/2 of sampling rate; Also called the limiting frequency
Class - D Amplifier
Word Clock
Average Bit Rate
Nyquist Frequency
26. 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
Sampling Theorem
Word Clock
Successive Approximation
Significand
27. 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
Lossless
Micron
Pulse Code Modulation
Bit Rate
28. Number of bits used to represent the smallest unit of information in an audio file; Greater bit depth = better quality audio
Photoreceptor
Normalizing
Non -Compressed Audio Data Rate Formula
Bit Depth
29. Built into DAWs; Bits are added when signals are mixed together to avoid clipping
Peak Level
Decimal- to-Binary Conversion
Morse Code
Headroom Bits
30. 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
Pulse Width Modulation
Psychoacoustics
D/A Conversion Signal Flow
31. (AES/EBU); 110O - 2- channel balanced digital audio cable with an XLR connection; NOT a mic cable!!
Buffering
Perceptual Coding
Multichannel Audio Digital Interface (MADI)
AES3
32. 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
DVD-Audio
Coaxial
DVD-5
Internal Resolution
33. Measuring equipment in A/D conversion that processes voltage and provides a value for that voltage
Sample Rate Effect on Anti-Aliasing
CPU Buffering
Quantizer
Word Clock
34. More aggressive lossy data reduction techniques that require further manipulation of the stereo field; Examples are 'Intensity' & 'M-S'
Spectra
Micron
Sampling (Samples)
Joint Stereo
35. Unit of measurement that is equal to one millionth of a meter
Micron
Claude Shannon
Audio over Ethernet (AoE)
Digital
36. Circuit that interprets the meaning of the symbols as they were chosen and arranged by the encode
Conversion Buffering
Compression
Buffering
Decoder
37. Have odd numbered harmonics
Square Wave
Variable Bit Rate
Floating Point
Tascam Digital Interface Format (TDIF)
38. Pertaining to hearing or sound; Combination of the intensity of air pressure molecules with amplitude
Acoustics
A/D Conversion
Requirements for A/D Conversion
SCMS
39. 'Capturing' part of digital audio; Never captures a signal perfectly
Buffering Locations
0 dB FS
Sampling Theorem
A/D Conversion
40. Industry Standards: -6 dB Peak = -20 RMS Meter
Anti-Aliasing Filter
Optical Cable
Physical Disc Format
Recording Levels
41. ADAT Optcal; 8- in/8- out on two cables; Fiber- optic - TOSLINK connector
Quantization Intervals
SACD
Decimal- to-Binary Conversion
Lightpipe
42. The ability of a digital system to perform complex DSP without running into problems with overflow or loss of resolution
Joint Stereo
Micron
Cutoff Frequency
Internal Resolution
43. Describes various optical disc characteristics including the size and shape of the disc - the size of pits - the speed at which the disc spins - and a multitude of aspects regarding the specifications of the player itself
Physical Disc Format
Word Clock
Sampling Rule
Requirements for CD Audio
44. A frequency specified for a filter (digital or electronic) the marks the point at which the frequency content of a signal is altered +/- 3dB
Algorithm
M-S Stereo
Foldover
Cutoff Frequency
45. 15.9 GB; DS/DL
SCMS
DVD-18
Coaxial
Variable Bit Rate
46. 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
Delta-Sigma Modulation
Threshold of Pain
Amplitude Accuracy
Lossy
47. Digital Word -> Series of Resistors (each with assigned charges) -> Sample- and-Hold Circuit -> Anti-Imaging Filter (Smoothing Filter) -> Reconstructed Sample
Base 2 System
Psychoacoustics
Fidelity
D/A Conversion Signal Flow
48. 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
Peak Level
Algorithm
Pulse Code Modulation
Lossless Formats
49. The mathematics - algorithms - and the techniques used to manipulate signals after they have been converted to digital form
Successive Approximation
Noise Shaping
Digital Signal Processing
Spectrum Multiplication
50. 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
Playback Buffering
RMS Meter
Exponent