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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. 12cm plastic disc; 1.2mm thick; One- sided; Red Laser; 1.6 microns between tracks; 125 nanometer pits
Analog
Lossless
Red Book
Sonogram
2. The process of reducing the space required to store data by efficiently encoding the content.
Compression
Bit Depth Effect on Dynamic Range
Pass Band
2 Dimensions of Sound
3. Defines the number of sample per second taken from a continuous signal to make a discrete signal; Governs the frequency response of digital audio
Blu-Ray
Sample Rate
Acoustics
DVD-14
4. Measure of sound pressure over the frequency spectrum - for which a listener perceives a constant loudness when presented with pure steady tones
Equal Loudness Contour
EtherSound
Significand
Requirements for CD Audio
5. 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
Sample Rate Effect on Anti-Aliasing
Constant Bit Rate
Subbands
6. Accuracy with which an electronic system reproduces the sound or image of its input signal
DVD-10
D/A Conversion Signal Flow
DVD-Audio
Fidelity
7. Number or variable that represents the number of times the base of a power is used as a factor; Defines magnitude
Impulse Response
RMS Meter
Exponent
Anti-Imaging Filter
8. Multi-Bit Words; (Pulse Code Modulation)
Decoder
6 dB
PCM
Frames
9. Low Pressure; Part in a longitudinal wave where the particles are spread apart
Rarefaction
CPU Buffering
Fidelity
Decoder
10. Very selective method of lowering buffer levels by halting different levels of audio processing
Peak Level
Anti-Imaging Filter
Overflow
Low-Latency Monitoring
11. The mathematics - algorithms - and the techniques used to manipulate signals after they have been converted to digital form
Pad Head & Tail
Digital Signal Processing
DVD-Audio
Joseph Fourier
12. Eliminates frequencies above the Nyquist limit from becoming samples; Occurs prior to quantization
6 dB
Anti-Aliasing Filter
Nyquist Frequency
Blu-Ray
13. MPEG; Standardizing body of audio coding
Motion Pictures Experts Group
Lossy
Quantization Intervals
Attenuation
14. The number of compressions or rarefactions in one second; The higher the frequency the more compressions & rarefactions per second; Measured in Hertz
Frequency
DVD-10
Subbands
CobraNet
15. Eight channel digital surround sound system by Dolby
D/A Conversion
Ethernet
Speed of Sound
Dolby 7.1
16. Difference in brightness between land and pit on a CD Physical Format
Oversampling
Entropy Coding
Joseph Fourier
Index of Reflectivity
17. Sony and Philips optical disc format; Utilizes sigma delta DSD to offer higher resolution; 1- bit; 2.8224 MHz; 6-Channel
Dolby 5.1
Footroom
Lossless
SACD
18. CBR; Codecs encodes data at a constant rate regardless of density of the audio file
Gain Staging
Constant Bit Rate
Delta-Sigma Modulation
Sawtooth Wave
19. A digital filter's time domain output sequence when the input is a single sample is input
Cutoff Frequency
Impulse Response
Digital
Internal Resolution
20. 1st commercially successful AoE format for the transmission of digital audio - video - and control signals over 64- channel 100Mbps Ethernet networks
Base 2 System
CobraNet
Nyquist Frequency
Optical Cable
21. Overtones that contribute to the timbre of a sound and make up a complex waveform's physical characteristics
Digital Signal Processing
Signal- to- Noise Ratio
Harmonic Content
Square Wave
22. The difference between the analog value and the approximated digital value due to the 'rounding' that occurs while converting the analog signal to digital
Quantization Error
Signal- to- Noise Ratio
Oscillation
Internal Resolution
23. Only 2 digits used; The value of each place (ones - hundreds - etc.) are as follows from greatest to least: 128 - 64 - 32 - 16 - 8 - 4 - 2 - 1
Average Bit Rate
Base 2 System
Transfer Protocol
Resolution
24. Data transmission protocol over which computer network traffic travels; Poorly suited to real- time transmission but numerous attempts have been made to harness the technology because of its flexible routing; Uses simple Cat5 cabling; Resists interfe
Audio over Ethernet (AoE)
Sample Rate
Pad Head & Tail
Sonogram
25. 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
Perceptual Coding
Normalizing
Edit Decision List
Psychoacoustics
26. Decibels Full Scale
Blu-Ray
Quantizer
dBFS
Convolution
27. A sample- by- sample operation on two signals
Jitter
Dolby 7.1
Convolution
DVD-5
28. Playback; I/O Connections; CPU (Streaming); Conversion from DAW or Software
Buffering Locations
Interleaved
Sample Rate
Signal- to- Noise Ratio
29. Removes high frequency images and noise and smoothes the stair case output coming from of the sample and hold circuit; Also called a SMOOTHING FILTER
Anti-Aliasing Filter
Anti-Imaging Filter
dBFS
Pass Band
30. EBU
Oversampling
Oscillation
Decimal- to-Binary Conversion
European Broadcasting Union
31. 'Capturing' part of digital audio; Never captures a signal perfectly
A/D Conversion
Interpolation Filter
Sonogram
Sawtooth Wave
32. Perceptual coding technique that uses louder sounds of a similar frequency to decide what information is to be saved during data reduction
Recording Levels
Cutoff Frequency
A/D Conversion Signal Flow
Masking Analysis...
33. The ability of a digital system to perform complex DSP without running into problems with overflow or loss of resolution
Bit Depth
Internal Resolution
Class - D Amplifier
Harry Nyquist
34. Measure of the amplitude of a longitudinal wave
Intensity
Peak Level
Data Packing
Impulse Response
35. Level above which audible sounds are painful (125 - 130 db)
Subbands
European Broadcasting Union
Bit Depth Effect on Dynamic Range
Threshold of Pain
36. 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
Gain Staging
Blu-Ray
Lossy
Nyquist Frequency
37. Inner ear component that attaches to the stapes and helps to decrease the amplitude of vibrations; Causes the masking phenomenon
DVD-Audio
Stapedes Reflex
Glass Master
Cutoff Frequency
38. 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
Bit Rate
Interpolation Filter
Audio over Ethernet (AoE)
Delta-Sigma Modulation
39. Same as 'aliasing'
Frequency
Lightpipe
Lossless
Foldover
40. ADPCM; Pulse code modulation that produces a digital signal with a lower bit rate than standard PCM; Records only the difference between samples
Compression
Frequency
Adaptive Pulse Code Modulation
Sampling Theorem
41. Built into DAWs; Bits are added when signals are mixed together to avoid clipping
Headroom Bits
Equal Loudness Contour
A/D Conversion
Impulse Response
42. 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
Bit Rate
Dolby 5.1
Spectrum Multiplication
Harmonic Content
43. 16-Bit; 44.1 kHz; PCM; Stereo
Oscillation
Amplitude Accuracy
Effective Bit Depth
Requirements for CD Audio
44. 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
Variable Bit Rate
Sampling Theorem
Micron
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
Peak Level
Edit Decision List
Decoder
Variable Bit Rate
46. 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
I/O Connection Buffering
dB/FS
Intensity Stereo
Additive Synthesis...
47. Snippets of time in which frequency analysis takes place in a perceptual codec
Interleaved
Speed of Sound
Digital Signal Processing
Frames
48. 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)
RMS
Word Clock
AoE Formats
I/O Connection Buffering
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
Conversion Buffering
Perceptual Coding
Physical Disc Format
Base 2 System
50. 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
Subbands
Pad Head & Tail
Internal Resolution
Pulse Code Modulation