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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. Unit of measurement that is equal to one billionth of a meter
Acoustics
Nanometer
Optical Cable
Joseph Fourier
2. 1st commercially successful AoE format for the transmission of digital audio - video - and control signals over 64- channel 100Mbps Ethernet networks
Voltage
Acoustics
M-S Stereo
CobraNet
3. French mathematician that noted that any complex sound can be broken down into a series of component pure tones
Algorithm
Buffer Size
Lossless
Joseph Fourier
4. Each bit in the bit depth is equal to a _____ increase in dynamic range
Buffer Size
Psychoacoustics
Codec
6 dB
5. Anytime bit depth is reduced the gap gets bigger so more dithering is required
2 Dimensions of Sound
Redither
Pad Head & Tail
Direct Monitoring
6. The set of rules that computers use to move files from one computer to another on an internet
Headroom Bits
Speed of Sound
Transfer Protocol
Dithering
7. 7.95 GB; SS/DL
Foldover
DVD-9
Aliasing
Nanometer
8. Smallest interval measurable by a scientific instrument; Defined by bit rate (sample rate x bit depth)
Rarefaction
Adaptive Pulse Code Modulation
Quantization Error
Resolution
9. A situation where a calculated value cannot fit into the number of digits reserved for it
Blu-Ray
Overflow
Requirements for A/D Conversion
Headroom Bits
10. AES
Joseph Fourier
DVD-10
Acoustics
Audio Engineering Society
11. The number of compressions or rarefactions in one second; The higher the frequency the more compressions & rarefactions per second; Measured in Hertz
Entropy Coding
Buffer Size
Frequency
Resolution
12. Lossless Format; Can hold up to 25GB on a single- layer disc and 50GB on a dual- layer disc
Blu-Ray
Fidelity
DVD-9
Sonogram
13. Full Scale; Type of metering that measures level in digital recording system; Recording and Mixing levels should NEVER exceed 0dB FS in digital audio or clipping will occur
DVD-18
Rarefaction
dB/FS
Buffering
14. Toshiba developed digital audio interface utilizes fiber optics as a transmission medium.
TOSLINK
Quantization
AES3
Sampling Theorem
15. The frequency above or below which attenuation begins in a filter circuit
Cutoff Frequency
Sawtooth Wave
0 dB FS
Quantization Error
16. Used as the main disc from which other discs are made; Composed of ground glass with a very fine photoresistor layer; An imaging laser burns pit and land patterns in preparation for duplication
2 Dimensions of Sound
Morse Code
Glass Master
Sample Rate Effect on Anti-Aliasing
17. Signal conversions are mixed with playback tracks resulting in near-zero latency
AES3
MONO
Direct Monitoring
Compression
18. Sony and Philips optical disc format; Utilizes sigma delta DSD to offer higher resolution; 1- bit; 2.8224 MHz; 6-Channel
Footroom
Optical Cable
SACD
DVD-14
19. Subtract place values from the decimal number and place ones or zeros in the correct places
European Broadcasting Union
Decimal- to-Binary Conversion
dBFS
Anti-Aliasing Filter
20. The ability of a digital system to perform complex DSP without running into problems with overflow or loss of resolution
Class - D Amplifier
Internal Resolution
Bit Depth
Direct Monitoring
21. Pertaining to hearing or sound; Combination of the intensity of air pressure molecules with amplitude
Quantization
Oscillation
Acoustics
Sample- and-Hold
22. Visual graph that shows how loud a sound is at different frequencies
Constant Bit Rate
SCMS
Sonogram
Latency
23. Six channel (five speakers and one subwoofer for bass) digital surround sound system by Dolby
Noise Shaping
Dolby 5.1
Joint Stereo
Lightpipe
24. Most significant lossless coding technique in current use; Measure of disorder in which long strings of data are represented by short symbols and uses the shortest symbols to represent the most common repetitive audio data maximizing data reduction
Quantization Error
Index of Reflectivity
Nyquist Frequency
Entropy Coding
25. Same as 'aliasing'
M-S Stereo
Additive Synthesis...
Non -Compressed Audio Data Rate Formula
Foldover
26. Based on psychoacoustics - these are the basis of frequency analysis for a perceptual codec;
DVD-18
Fidelity
DVD-9
Subbands
27. Father of modern information theory; Solidified the Nyquist Theory by adding the concept that bits per second (binary representation of audio signals) must be at equal intervals to accurately represent data
Psychoacoustics
Compression
Direct Monitoring
Claude Shannon
28. Twice as many samples as the highest frequency at minimum; Sampling rate totally controls frequency response
Quantization Error
Threshold of Hearing
Sampling Rule
Blu-Ray
29. Waveform of a pure tone showing simple harmonic motion
M-S Stereo
Convolution
Sine Wave
Claude Shannon
30. When recording you want the smallest buffer available; When mixing you want the largest buffer available
Buffer Size
DVD-9
Impulse Response
European Broadcasting Union
31. Eliminates frequencies above the Nyquist limit from becoming samples; Occurs prior to quantization
Anti-Aliasing Filter
DVD-Audio
Fletcher- Munson Curve
Quantization
32. More aggressive lossy data reduction techniques that require further manipulation of the stereo field; Examples are 'Intensity' & 'M-S'
Joint Stereo
Intensity
Nyquist Frequency
Oversampling
33. Describes acceptable data - performances both offered and essential for a disc player - and the complete user experience
Logical Format
Analog
Square Wave
Digital
34. Digital and analog processing capability is combined on a single microchip allowing for 1- bit resolution at high sample rates
M-S Stereo
Pulse Code Modulation
Delta-Sigma Modulation
CobraNet
35. 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
Spectra
Variable Bit Rate
Glass Master
Rarefaction
36. The more bits allocated during quantization - the more accurate the measurement
Photoreceptor
Spectra
Foldover
Bit Depth Effect on Dynamic Range
37. Uses entropy coding as the basis; Computer data compression algorithm that packages files such as .ZIP & .RAR
Attenuation
RMS Meter
Nanometer
Data Packing
38. A method of representing real numbers using a mantissa and an exponent
Signal- to- Noise Ratio
Compression
Floating Point
6 dB
39. Circuit that interprets the meaning of the symbols as they were chosen and arranged by the encode
Decoder
Headroom Bits
Tascam Digital Interface Format (TDIF)
Playback Buffering
40. DAW's and software must buffer when converting or bouncing and this latency can add up if not monitored
M-S Stereo
Playback Buffering
Storage Conversion Steps
Conversion Buffering
41. 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
DVD-5
Decimal- to-Binary Conversion
Bit Rate
42. More accuracy in low amplitudes and less in higher amplitudes
Entropy Coding
Conversion Buffering
Amplitude Accuracy
Noise Shaping
43. 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
AES3
Pulse Width Modulation
Zero-Latency Monitoring
Buffering
44. 4.38 GB; SS/SL
Attenuation
DVD-5
Low-Latency Monitoring
DVD-14
45. 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
Jitter
Buffering Locations
Decimation Filter
Peak Level
46. 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
Redither
Recording Levels
Impulse Response
47. How Loud (Y-Axis) & How Fast (X-Axis)
Physical Disc Format
2 Dimensions of Sound
DVD-5
Dithering
48. Allows for an internal sample rate at multiples of the input and output rates; Alleviates the need for steep 'brickwall' filters; Often combined with internal '1- bit' processing; Increases smoothing effect
Oversampling
Successive Approximation
Sampling Theorem
Inter-Channel Redundancy
49. In order to play multiple channels at one time data is buffered as read to disk; Latency happens between play command & beginning of playback
Equal Loudness Contour
Playback Buffering
A/D Conversion Signal Flow
Quantization
50. Method of sampling data at a higher resolution (higher sample rate) as a means of reducing harmonic content during D/A conversion; (x2) oversampling gets rid of all odd harmonic content
Micron
Oversampling
Delta-Sigma Modulation
Buffer Size
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