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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. Six channel (five speakers and one subwoofer for bass) digital surround sound system by Dolby
Pulse Code Modulation
Noise Shaping
Dolby 5.1
Resolution
2. Pertaining to hearing or sound; Combination of the intensity of air pressure molecules with amplitude
Direct Monitoring
Acoustics
Y-Axis Terminology
Sonogram
3. Low Pressure; Part in a longitudinal wave where the particles are spread apart
Bit Depth
Micron
Data Packing
Rarefaction
4. The continuous loss of signal strengths as a signal travels through a medium
Attenuation
Sample Rate
Fourier Series
Interleaved
5. 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
Average Bit Rate
Motion Pictures Experts Group
Peak Level
2 Dimensions of Sound
6. The set of rules that computers use to move files from one computer to another on an internet
Buffering Locations
Spectrum Multiplication
Transfer Protocol
Inter-Channel Redundancy
7. 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
Audio Engineering Society
Gain Staging
Aliasing
Low-Latency Monitoring
8. Serial Copy Management System; main difference between AES3 & S/PIDF
Zero-Latency Monitoring
Attenuation
Dolby 7.1
SCMS
9. Inner ear component that attaches to the stapes and helps to decrease the amplitude of vibrations; Causes the masking phenomenon
Stapedes Reflex
Fidelity
CPU Buffering
Speed of Sound
10. Overtones that contribute to the timbre of a sound and make up a complex waveform's physical characteristics
Harmonic Content
Attenuation
Tascam Digital Interface Format (TDIF)
Optical Cable
11. Subtract place values from the decimal number and place ones or zeros in the correct places
Morse Code
Rarefaction
Logical Format
Decimal- to-Binary Conversion
12. 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
Physical Disc Format
DVD-5
Variable Bit Rate
13. A method of representing real numbers using a mantissa and an exponent
Adaptive Pulse Code Modulation
Motion Pictures Experts Group
Floating Point
DVD-9
14. 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
Variable Bit Rate
Pulse Width Modulation
Sonogram
Voltage
15. Take up half as many bits (50%); Algorithm can keep same quality by lossing the stereo track
dB/SPL
Multichannel Audio Digital Interface (MADI)
MONO
Sample Rate
16. Playback; I/O Connections; CPU (Streaming); Conversion from DAW or Software
Additive Synthesis...
Ethernet
Buffering Locations
Compression
17. Measure of the amplitude of a longitudinal wave
Intensity Stereo
CPU Buffering
Intensity
Red Book
18. Toshiba developed digital audio interface utilizes fiber optics as a transmission medium.
Non -Compressed Audio Data Rate Formula
Pulse Width Modulation
TOSLINK
Threshold of Hearing
19. A frequency specified for a filter (digital or electronic) the marks the point at which the frequency content of a signal is altered +/- 3dB
Cutoff Frequency
Speed of Sound
Buffer Size
Pad Head & Tail
20. Number or variable that represents the number of times the base of a power is used as a factor; Defines magnitude
Quantization Intervals
Exponent
SACD
Attenuation
21. Measurement at regular intervals of the amplitude of a varying waveform (in order to convert it to digital form); There must be a minimum of 2 samples for each cycle in a waveform
Signal- to- Noise Ratio
Psychoacoustics
Peak Level
Sampling (Samples)
22. 'Capturing' part of digital audio; Never captures a signal perfectly
DVD-5
A/D Conversion
Digital Signal Processing
Joint Stereo
23. CBR; Codecs encodes data at a constant rate regardless of density of the audio file
Algorithm
Constant Bit Rate
dBFS
CPU Buffering
24. 16-Bit; 44.1 kHz; PCM; Stereo
Requirements for CD Audio
Sonogram
Edit Decision List
Speed of Sound
25. Voltage -> Dither -> Anti-Aliasing (Low Pass Filter) -> Sample & Hold Circuit -> Successive Approximation/Quantizer --) 100111010 (PCM Audio File)
Sine Wave
A/D Conversion Signal Flow
AoE Formats
CPU Buffering
26. 1.) Bit Rate x Sample Rate (you'll get b/sec) 2.) Multiply by 60 if converting seconds to minutes 3.) Divide by 8 to convert bits to Bytes and get B/min 4.) Divide by 1 -024 to get KB/min and keep doing it until you get desired bit rate specification
Storage Conversion Steps
Playback Buffering
Compression
Frames
27. Method of representing an acoustic quantity with a series of binary numbers; Can have only specific individually distinct values
Word Clock
Digital
Perceptual Coding
Analog
28. Mixing data and control characters in a single operation
Decimation Filter
Interleaved
2 Dimensions of Sound
Sinusoidal
29. A digital filter's time domain output sequence when the input is a single sample is input
Signal- to- Noise Ratio
Impulse Response
Algorithm
Nanometer
30. Digital Word -> Series of Resistors (each with assigned charges) -> Sample- and-Hold Circuit -> Anti-Imaging Filter (Smoothing Filter) -> Reconstructed Sample
Foldover
Buffering Locations
Oversampling
D/A Conversion Signal Flow
31. EBU
D/A Conversion Signal Flow
Requirements for CD Audio
European Broadcasting Union
AoE Formats
32. Circuit that interprets the meaning of the symbols as they were chosen and arranged by the encode
Effective Bit Depth
Interleaved
Codec
Decoder
33. Visual graph that shows how loud a sound is at different frequencies
Spectrum Multiplication
Sonogram
Oscillation
Quantization Intervals
34. Sony and Philips optical disc format; Utilizes sigma delta DSD to offer higher resolution; 1- bit; 2.8224 MHz; 6-Channel
SACD
Sampling Rule
MONO
dB/FS
35. Uses entropy coding as the basis; Computer data compression algorithm that packages files such as .ZIP & .RAR
Data Packing
Nyquist Frequency
Masking Analysis...
MONO
36. Occurs as data is assembled into meaningful bits or information and as left & right channels are separated
Equal Loudness Contour
Dolby 5.1
I/O Connection Buffering
Amplitude Accuracy
37. 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
Lossless
TOSLINK
Sawtooth Wave
MONO
38. Difference in brightness between land and pit on a CD Physical Format
European Broadcasting Union
Aliasing
Sample- and-Hold
Index of Reflectivity
39. 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
Perceptual Coding
Jitter
Exponent
Ethernet
40. How Loud (Y-Axis) & How Fast (X-Axis)
2 Dimensions of Sound
MONO
Internal Resolution
Buffering Locations
41. Branch of psychology concerned with the subjective perception of sound
Buffering
Psychoacoustics
Nyquist Frequency
Dithering
42. 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
Fidelity
Sawtooth Wave
Jitter
Buffer Size
43. Level above which audible sounds are painful (125 - 130 db)
0 dB FS
Masking Analysis...
Transfer Protocol
Threshold of Pain
44. Twice as many samples as the highest frequency at minimum; Sampling rate totally controls frequency response
X-Axis Terminology
Exponent
Oscillation
Sampling Rule
45. Number of bits per second processed when sampling sound; (Sampling Rate x Bit Depth) = Resolution
Bit Rate
Frames
2 Dimensions of Sound
Digital
46. Algorithm uses matrix of a mid/side microphone pair to determine a side signal & that signal is reduced then distributed as code in stereo
M-S Stereo
Buffering Locations
Decimal- to-Binary Conversion
Analog
47. 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);
dB/FS
Decoder
DVD-10
Decimation Filter
48. Defines the number of sample per second taken from a continuous signal to make a discrete signal; Governs the frequency response of digital audio
Non -Compressed Audio Data Rate Formula
AES3
Sample Rate
Conversion Buffering
49. 12cm plastic disc; 1.2mm thick; One- sided; Red Laser; 1.6 microns between tracks; 125 nanometer pits
DVD-9
Normalizing
Red Book
Equal Loudness Contour
50. 4.38 GB; SS/SL
Sample- and-Hold
Significand
DVD-5
Class - D Amplifier