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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. Apple Lossless; Windows Media Lossless; DTS HD Master Audio; Dolby True HD; FLAC
Lossless Formats
Fidelity
Dithering
Masking Analysis...
2. Have odd numbered harmonics
Variable Bit Rate
Square Wave
Nanometer
Decimation Filter
3. 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
Oversampling
Pulse Width Modulation
Successive Approximation
Coaxial
4. A situation where a calculated value cannot fit into the number of digits reserved for it
Buffering Locations
Internal Resolution
Overflow
Oversampling
5. CBR; Codecs encodes data at a constant rate regardless of density of the audio file
Constant Bit Rate
Lossy
Internal Resolution
Direct Monitoring
6. 16-Bit; 44.1 kHz; PCM; Stereo
Oscillation
Audio Engineering Society
Requirements for CD Audio
Amplitude Accuracy
7. The act of a frequency swinging back and forth with a steady - uninterrupted rhythm
Oscillation
Class - D Amplifier
Floating Point
Spectrum Multiplication
8. Industry Standards: -6 dB Peak = -20 RMS Meter
Oversampling
A/D Conversion Signal Flow
Recording Levels
Index of Reflectivity
9. Leaving space at beginning and ending of song for data crunching during mastering; Last step in mastering process
Base 2 System
Pad Head & Tail
Glass Master
EtherSound
10. 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
CPU Buffering
Jitter
Glass Master
Footroom
11. 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
Pulse Code Modulation
RMS Meter
Interleaved
Morse Code
12. Digital Word -> Series of Resistors (each with assigned charges) -> Sample- and-Hold Circuit -> Anti-Imaging Filter (Smoothing Filter) -> Reconstructed Sample
Optical Cable
Conversion Buffering
D/A Conversion Signal Flow
Non -Compressed Audio Data Rate Formula
13. 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
Coaxial
dBFS
Sampling Theorem
6 dB
14. The loudest point of a Full Scale system
Motion Pictures Experts Group
Digital
Frequency
0 dB FS
15. The difference between the analog value and the approximated digital value due to the 'rounding' that occurs while converting the analog signal to digital
Dolby 7.1
Frames
Bit Depth Effect on Dynamic Range
Quantization Error
16. The continuous loss of signal strengths as a signal travels through a medium
Attenuation
Fidelity
Motion Pictures Experts Group
Codec
17. Each bit in the bit depth is equal to a _____ increase in dynamic range
Aliasing
dBFS
Spectrum Multiplication
6 dB
18. Serial Copy Management System; main difference between AES3 & S/PIDF
Aliasing
SCMS
Additive Synthesis...
Threshold of Pain
19. MPEG; Standardizing body of audio coding
Equal Loudness Contour
Blu-Ray
Inter-Channel Redundancy
Motion Pictures Experts Group
20. VBR; Most common & best data reduction technique; Codecs that encode data by determining how dense or sparse areas of the audio are; Can result in buffering issues
Amplitude Accuracy
Harmonic Content
Data Packing
Variable Bit Rate
21. Eliminates frequencies above the Nyquist limit from becoming samples; Occurs prior to quantization
Anti-Imaging Filter
X-Axis Terminology
Anti-Aliasing Filter
Red Book
22. 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
Motion Pictures Experts Group
Algorithm
Fidelity
Spectrum Multiplication
23. Ratio of magnitude of the analytical signal to the magnitude of the background noise signal
Signal- to- Noise Ratio
Oversampling
Dolby 7.1
Dynamic Range
24. Anytime bit depth is reduced the gap gets bigger so more dithering is required
Redither
Nanometer
0 dB FS
Tascam Digital Interface Format (TDIF)
25. Lossless Format; Can hold up to 25GB on a single- layer disc and 50GB on a dual- layer disc
Blu-Ray
Sinusoidal
Average Bit Rate
Impulse Response
26. A frequency specified for a filter (digital or electronic) the marks the point at which the frequency content of a signal is altered +/- 3dB
Floating Point
Additive Synthesis...
Index of Reflectivity
Cutoff Frequency
27. Snippets of time in which frequency analysis takes place in a perceptual codec
Class - D Amplifier
Interleaved
Frames
DVD-Audio
28. 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
Nyquist Frequency
Intensity Stereo
Storage Conversion Steps
Cutoff Frequency
29. Occurs as data is assembled into meaningful bits or information and as left & right channels are separated
Ethernet
I/O Connection Buffering
Blu-Ray
Sine Wave
30. Series of dots and dashes representing the letters of the alphabet; Most common letters are represented by the shortest dots and dashes; Example of entropy coding
EtherSound
Lossy
Morse Code
Bit Depth
31. 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
Normalizing
Square Wave
Sample- and-Hold
Compression
32. Circuit that seizes voltage values with each tick of an A/D device's internal clock
Buffering
Algorithm
Voltage
Sample- and-Hold
33. When recording you want the smallest buffer available; When mixing you want the largest buffer available
Y-Axis Terminology
Buffer Size
Spectrum Multiplication
Gain Staging
34. 12cm plastic disc; 1.2mm thick; One- sided; Red Laser; 1.6 microns between tracks; 125 nanometer pits
Subbands
DVD-Audio
Red Book
AES3
35. 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
dB/FS
Lossy
Subbands
Average Bit Rate
36. (Amplitude Based) Amplitude: Voltage; Quantization; Bit Depth; Quantization Intervals; Quantization Noise; [Signal:Quantization Noise Ratio]; Dither; Dynamic Range
Y-Axis Terminology
MONO
CobraNet
I/O Connection Buffering
37. Single- pin RCA cable or fiber- optic TOSLINK connector used for digital transfer; 75O coaxial - 2- channel unbalanced; 'Consumer' format of AES3
Zero-Latency Monitoring
Digital
Sony-Philips Digital Interface Format (S/PDIF)
Requirements for A/D Conversion
38. DAW's and software must buffer when converting or bouncing and this latency can add up if not monitored
Pass Band
Edit Decision List
Conversion Buffering
Frames
39. 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
M-S Stereo
Anti-Imaging Filter
AES3
40. 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
Quantization Error
Impulse Response
Sample Rate Effect on Anti-Aliasing
Frequency
41. Perceptual coding technique that uses louder sounds of a similar frequency to decide what information is to be saved during data reduction
Adaptive Pulse Code Modulation
Foldover
Masking Analysis...
Voltage
42. 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'
Latency
Spectra
DVD-18
Edit Decision List
43. Six channel (five speakers and one subwoofer for bass) digital surround sound system by Dolby
Fourier Series
AoE Formats
Pad Head & Tail
Dolby 5.1
44. The number of compressions or rarefactions in one second; The higher the frequency the more compressions & rarefactions per second; Measured in Hertz
Internal Resolution
Nanometer
Decimation Filter
Frequency
45. Overtones that contribute to the timbre of a sound and make up a complex waveform's physical characteristics
Overflow
Sonogram
Harmonic Content
Buffer Size
46. Low Pressure; Part in a longitudinal wave where the particles are spread apart
Buffering
Inter-Channel Redundancy
Rarefaction
Constant Bit Rate
47. (Time Based) Frequency: Aliasing; Anti-Aliasing Filter; Sample Rate; Nyquist Limit
Sample Rate
X-Axis Terminology
Photoreceptor
DVD-9
48. 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
Convolution
Entropy Coding
Impulse Response
Perceptual Coding
49. Roughly around 1 -130 ft/s
Footroom
Speed of Sound
Intensity Stereo
Bit Depth
50. More aggressive lossy data reduction techniques that require further manipulation of the stereo field; Examples are 'Intensity' & 'M-S'
Joint Stereo
D/A Conversion Signal Flow
Tascam Digital Interface Format (TDIF)
Adaptive Pulse Code Modulation