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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. 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'
Digital Signal Processing
Latency
Base 2 System
CPU Buffering
2. Uses entropy coding as the basis; Computer data compression algorithm that packages files such as .ZIP & .RAR
Data Packing
Digital Signal Processing
Pass Band
Audio over Ethernet (AoE)
3. Number of bits used to represent the smallest unit of information in an audio file; Greater bit depth = better quality audio
Bit Depth
Interpolation Filter
D/A Conversion Signal Flow
DVD-5
4. Discrete incremental distinctions made between the value of one sample and the next; Breaks down bit depth into a series of evenly spaced intervals
Internal Resolution
Amplitude Accuracy
dB/FS
Quantization Intervals
5. High Pressure - Part of a longitudinal wave where the particles of the medium are close together
Compression
Low-Latency Monitoring
Ethernet
Class - D Amplifier
6. 12.33 GB; DS/ML
Red Book
Effective Bit Depth
Normalizing
DVD-14
7. Visual graph that shows how loud a sound is at different frequencies
Convolution
Headroom Bits
Sonogram
Intensity
8. Built into DAWs; Bits are added when signals are mixed together to avoid clipping
Headroom Bits
Bit Rate
Optical Cable
A/D Conversion
9. Data is transmitted over fiber optic lines; Uses a TOSLINK connecter instead of an RCA type; Can transmit multi- channel audio; Not susceptible to ground hum and loops; Able to support far higher rates of data transfer over greater distances than coa
Sony-Philips Digital Interface Format (S/PDIF)
Blu-Ray
Optical Cable
TOSLINK
10. 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
D/A Conversion Signal Flow
Threshold of Pain
Optical Cable
Successive Approximation
11. Eliminates frequencies above the Nyquist limit from becoming samples; Occurs prior to quantization
Variable Bit Rate
Decimal- to-Binary Conversion
Anti-Aliasing Filter
2 Dimensions of Sound
12. DAW's and software must buffer when converting or bouncing and this latency can add up if not monitored
Internal Resolution
Data Packing
Pad Head & Tail
Conversion Buffering
13. Serial Copy Management System; main difference between AES3 & S/PIDF
Threshold of Hearing
Sampling (Samples)
SCMS
Attenuation
14. The number of compressions or rarefactions in one second; The higher the frequency the more compressions & rarefactions per second; Measured in Hertz
Amplitude Accuracy
Frequency
EtherSound
Latency
15. 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
Low-Latency Monitoring
Y-Axis Terminology
A/D Conversion Signal Flow
Sampling Theorem
16. The loudest point of a Full Scale system
0 dB FS
Attenuation
Delta-Sigma Modulation
Requirements for A/D Conversion
17. Rate at which energy is drawn from a source that produces a flow of electricity in a circuit; Expressed in volts
Voltage
Foldover
Redither
Algorithm
18. Process that begins with a fast FFT analysis of the spectra of two input signals - then the multiplication of like frequencies - and IFFT to finalize the process
Voltage
CobraNet
Multichannel Audio Digital Interface (MADI)
Spectrum Multiplication
19. Voltage -> Dither -> Anti-Aliasing (Low Pass Filter) -> Sample & Hold Circuit -> Successive Approximation/Quantizer --) 100111010 (PCM Audio File)
Optical Cable
Frames
A/D Conversion Signal Flow
Sample Rate Effect on Anti-Aliasing
20. Based on psychoacoustics - these are the basis of frequency analysis for a perceptual codec;
DVD-18
Fourier Series
Subbands
SACD
21. Unit of measurement that is equal to one billionth of a meter
Pulse Code Modulation
Requirements for CD Audio
Threshold of Pain
Nanometer
22. Pertaining to hearing or sound; Combination of the intensity of air pressure molecules with amplitude
Significand
Variable Bit Rate
Acoustics
Bit Depth Effect on Dynamic Range
23. Sony and Philips optical disc format; Utilizes sigma delta DSD to offer higher resolution; 1- bit; 2.8224 MHz; 6-Channel
Normalizing
SACD
Recording Levels
Pulse Density Modulation
24. 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
Fletcher- Munson Curve
Buffering
Convolution
Low-Latency Monitoring
25. Based on Full Scale (dB/FS); -6dB represents a loss of one bit so account for this when calculating
Anti-Aliasing Filter
Effective Bit Depth
Pad Head & Tail
A/D Conversion Signal Flow
26. Computer program or device capable of encoding and/or decoding a digital data stream with the end result being a reduced file size
Psychoacoustics
Pulse Density Modulation
Codec
dB/FS
27. Sony sigma- delta modulation based technology that bypasses the decimation and interpolation steps found in PCM converters
Direct Stream Digital
Lightpipe
I/O Connection Buffering
Anti-Aliasing Filter
28. Unit of measurement that is equal to one millionth of a meter
RMS Meter
Micron
Intensity
RMS
29. High channel count; 64 channels on one cable; Coaxial cable with BNC connector or fiber optic with ST1 connector
Multichannel Audio Digital Interface (MADI)
PCM
Glass Master
Joint Stereo
30. Each bit in the bit depth is equal to a _____ increase in dynamic range
Average Bit Rate
Aliasing
Quantizer
6 dB
31. Algorithm uses matrix of a mid/side microphone pair to determine a side signal & that signal is reduced then distributed as code in stereo
Digital Signal Processing
M-S Stereo
Pass Band
DVD-14
32. Twice as many samples as the highest frequency at minimum; Sampling rate totally controls frequency response
Frequency
Coaxial
Sampling Rule
Dolby 5.1
33. Difference in brightness between land and pit on a CD Physical Format
Index of Reflectivity
DVD-5
Glass Master
Quantizer
34. A method of representing real numbers using a mantissa and an exponent
Floating Point
Sonogram
M-S Stereo
Compression
35. How Loud (Y-Axis) & How Fast (X-Axis)
Compression
2 Dimensions of Sound
Edit Decision List
Sawtooth Wave
36. 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
Speed of Sound
DVD-Audio
Stapedes Reflex
Lossy
37. (Amplitude Based) Amplitude: Voltage; Quantization; Bit Depth; Quantization Intervals; Quantization Noise; [Signal:Quantization Noise Ratio]; Dither; Dynamic Range
TOSLINK
Y-Axis Terminology
Joseph Fourier
Sample Rate Effect on Anti-Aliasing
38. The amount of energy at each wavelength
RMS Meter
Audio Engineering Society
Spectra
Quantization
39. MPEG; Standardizing body of audio coding
Joint Stereo
Ethernet
Motion Pictures Experts Group
Additive Synthesis...
40. Anytime bit depth is reduced the gap gets bigger so more dithering is required
Noise Shaping
Blu-Ray
Redither
Digital Signal Processing
41. 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
Interpolation Filter
Aliasing
Blu-Ray
Compression
42. The set of rules that computers use to move files from one computer to another on an internet
Anti-Aliasing Filter
Playback Buffering
Transfer Protocol
Harry Nyquist
43. 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
Audio Engineering Society
Cutoff Frequency
Jitter
44. 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
2 Dimensions of Sound
Decoder
Requirements for A/D Conversion
Ethernet
45. Very quiet digital amplifier that produces a series of output pulses with the audio signal coded the same as the width of the output pulses; Pulses are used to represent wave forms and are either on or off; Intense signals have long pulses with short
Base 2 System
Intensity
Data Packing
Class - D Amplifier
46. Method of representing an acoustic quantity with a series of binary numbers; Can have only specific individually distinct values
Sample Rate Effect on Anti-Aliasing
Quantization Intervals
Sinusoidal
Digital
47. 'Capturing' part of digital audio; Never captures a signal perfectly
A/D Conversion
Intensity
Frames
Psychoacoustics
48. Roughly around 1 -130 ft/s
Amplitude Accuracy
Sampling Rule
Speed of Sound
Anti-Aliasing Filter
49. 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
Edit Decision List
Significand
Tascam Digital Interface Format (TDIF)
50. Used when the reference pressure of a sound is 20 microPa (0.00002); Sound Pressure Level; Measure of amplitude
Blu-Ray
Oversampling
Threshold of Pain
dB/SPL