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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. 1st commercially successful AoE format for the transmission of digital audio - video - and control signals over 64- channel 100Mbps Ethernet networks
AoE Formats
CobraNet
Exponent
Interleaved
2. Perceptual coding technique that uses louder sounds of a similar frequency to decide what information is to be saved during data reduction
Threshold of Pain
Masking Analysis...
Dolby 5.1
Class - D Amplifier
3. Lossless Format; Can hold up to 25GB on a single- layer disc and 50GB on a dual- layer disc
CPU Buffering
Interpolation Filter
Quantization Intervals
Blu-Ray
4. Sum of all harmonics; Sum of sine and cosine waves which have frequencies f - 2f - 3f - 4f...
Fourier Series
Motion Pictures Experts Group
Sampling (Samples)
Logical Format
5. The act of a frequency swinging back and forth with a steady - uninterrupted rhythm
D/A Conversion
Oscillation
Quantization
Anti-Aliasing Filter
6. 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)
Peak Level
RMS
Interpolation Filter
Algorithm
7. Measure of the amplitude of a longitudinal wave
Intensity
EtherSound
Resolution
Micron
8. 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
Entropy Coding
Class - D Amplifier
Amplitude Accuracy
Variable Bit Rate
9. Signal that uses variable voltage to create continuous waves resulting in an inexact transmission
Joint Stereo
Resolution
Oversampling
Analog
10. Unit of measurement that is equal to one millionth of a meter
Effective Bit Depth
Masking Analysis...
Micron
dB/FS
11. 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
Frequency
Subbands
dB/FS
Entropy Coding
12. Multi-Bit Words; (Pulse Code Modulation)
PCM
MONO
Multichannel Audio Digital Interface (MADI)
Lossless Formats
13. 'Reconstructing' part of digital audio
Sine Wave
D/A Conversion
Impulse Response
DVD-Audio
14. CobraNet; EtherSound; Dante; AVB (currently under development)
Impulse Response
AoE Formats
Cutoff Frequency
Psychoacoustics
15. Take up half as many bits (50%); Algorithm can keep same quality by lossing the stereo track
Resolution
Bit Depth Effect on Dynamic Range
A/D Conversion Signal Flow
MONO
16. Measuring equipment in A/D conversion that processes voltage and provides a value for that voltage
Intensity
Subbands
Quantizer
Fletcher- Munson Curve
17. Channels are processed one at a time and the results are stored on multiple CPU buffers that alternately send data as DAW requests the data for playback; First few seconds are relayed to the buffer prior to processing and playback and it continuously
Interpolation Filter
Footroom
CPU Buffering
Buffering Locations
18. 'Capturing' part of digital audio; Never captures a signal perfectly
dB/SPL
Glass Master
Digital
A/D Conversion
19. Serial Copy Management System; main difference between AES3 & S/PIDF
Headroom Bits
Word Clock
Buffering Locations
SCMS
20. 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
Buffering
Pulse Code Modulation
Word Clock
DVD-9
21. 8.75 GB; DS/SL
DVD-10
Floating Point
Recording Levels
Amplitude Accuracy
22. Decibels Full Scale
Optical Cable
I/O Connection Buffering
Frequency
dBFS
23. More aggressive lossy data reduction techniques that require further manipulation of the stereo field; Examples are 'Intensity' & 'M-S'
Threshold of Pain
Convolution
Algorithm
Joint Stereo
24. ADPCM; Pulse code modulation that produces a digital signal with a lower bit rate than standard PCM; Records only the difference between samples
Adaptive Pulse Code Modulation
Additive Synthesis...
Masking Analysis...
Significand
25. 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
DVD-9
Normalizing
Audio over Ethernet (AoE)
Decoder
26. Branch of psychology concerned with the subjective perception of sound
Psychoacoustics
Bit Rate
Digital Signal Processing
I/O Connection Buffering
27. Waveform of a pure tone showing simple harmonic motion
SCMS
Interpolation Filter
Sine Wave
Sample Rate Effect on Anti-Aliasing
28. Based on psychoacoustics - these are the basis of frequency analysis for a perceptual codec;
Constant Bit Rate
Lossy
Subbands
Pad Head & Tail
29. Smallest interval measurable by a scientific instrument; Defined by bit rate (sample rate x bit depth)
Sampling (Samples)
Variable Bit Rate
Resolution
Decimation Filter
30. Describes various optical disc characteristics including the size and shape of the disc - the size of pits - the speed at which the disc spins - and a multitude of aspects regarding the specifications of the player itself
Oversampling
Fletcher- Munson Curve
Variable Bit Rate
Physical Disc Format
31. Used when the reference pressure of a sound is 20 microPa (0.00002); Sound Pressure Level; Measure of amplitude
Psychoacoustics
dB/SPL
Quantization Intervals
Signal- to- Noise Ratio
32. Have odd numbered harmonics
Threshold of Pain
Bit Rate
Lossy
Square Wave
33. 15.9 GB; DS/DL
dBFS
Digital
DVD-18
Impulse Response
34. 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
Digital
Optical Cable
Adaptive Pulse Code Modulation
Average Bit Rate
35. Amplitude meter that takes the square root of all instantaneous amplitudes and averages them to find a mean and squares that value; Useful with particularly complex waveforms
RMS Meter
MONO
X-Axis Terminology
PCM
36. Built into DAWs; Bits are added when signals are mixed together to avoid clipping
Joint Stereo
Interleaved
Requirements for CD Audio
Headroom Bits
37. Industry Standards: -6 dB Peak = -20 RMS Meter
Masking Analysis...
Recording Levels
DVD-14
Interpolation Filter
38. 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
Sample- and-Hold
Jitter
Dithering
Successive Approximation
39. The process of reducing the space required to store data by efficiently encoding the content.
Compression
Quantization Error
Rarefaction
Footroom
40. MPEG; Standardizing body of audio coding
Word Clock
Rarefaction
Motion Pictures Experts Group
Joint Stereo
41. Ratio of magnitude of the analytical signal to the magnitude of the background noise signal
Threshold of Hearing
Signal- to- Noise Ratio
Voltage
DVD-10
42. Apple Lossless; Windows Media Lossless; DTS HD Master Audio; Dolby True HD; FLAC
dB/SPL
Analog
Lossless Formats
Additive Synthesis...
43. Occurs as data is assembled into meaningful bits or information and as left & right channels are separated
Algorithm
Significand
I/O Connection Buffering
DVD-14
44. Visual graph that shows how loud a sound is at different frequencies
Sonogram
Class - D Amplifier
Oscillation
Decimation Filter
45. CBR; Codecs encodes data at a constant rate regardless of density of the audio file
Normalizing
Spectra
Attenuation
Constant Bit Rate
46. The mathematics - algorithms - and the techniques used to manipulate signals after they have been converted to digital form
Glass Master
DVD-9
Spectra
Digital Signal Processing
47. The loudest point of a Full Scale system
TOSLINK
Floating Point
Constant Bit Rate
0 dB FS
48. Signal conversions are mixed with playback tracks resulting in near-zero latency
Impulse Response
Direct Monitoring
CobraNet
Sample Rate Effect on Anti-Aliasing
49. 8- in/8- out on one cable; 25- pin D- sub connector
Morse Code
Tascam Digital Interface Format (TDIF)
Square Wave
Red Book
50. 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
TOSLINK
RMS Meter
Sample Rate Effect on Anti-Aliasing
Base 2 System