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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. Measure of the amplitude of a longitudinal wave
Intensity
CobraNet
Zero-Latency Monitoring
dB/SPL
2. Sony sigma- delta modulation based technology that bypasses the decimation and interpolation steps found in PCM converters
Direct Stream Digital
A/D Conversion
Codec
Analog
3. Used when the reference pressure of a sound is 20 microPa (0.00002); Sound Pressure Level; Measure of amplitude
Delta-Sigma Modulation
Coaxial
dB/SPL
Compression
4. Anytime bit depth is reduced the gap gets bigger so more dithering is required
Sawtooth Wave
Fletcher- Munson Curve
Impulse Response
Redither
5. 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
Lossy
Sawtooth Wave
Morse Code
Low-Latency Monitoring
6. Improper (false) sampling of high frequencies that cause much lower frequencies to be produced when the audio is reconstructed; Foldover happens at higher frequencies as harmonics reach levels that exceed the Nyquist limit.
Aliasing
Quantization
Claude Shannon
Internal Resolution
7. Industry Standards: -6 dB Peak = -20 RMS Meter
Sample- and-Hold
Recording Levels
Bit Rate
D/A Conversion
8. 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
PCM
Spectra
RMS Meter
CPU Buffering
9. 'Capturing' part of digital audio; Never captures a signal perfectly
Overflow
A/D Conversion
Foldover
Rarefaction
10. More aggressive lossy data reduction techniques that require further manipulation of the stereo field; Examples are 'Intensity' & 'M-S'
Square Wave
Blu-Ray
Lossy
Joint Stereo
11. Eight channel digital surround sound system by Dolby
Motion Pictures Experts Group
AES3
Dolby 7.1
Edit Decision List
12. The process of reducing the space required to store data by efficiently encoding the content.
Compression
Low-Latency Monitoring
Recording Levels
Bit Depth Effect on Dynamic Range
13. Allowance of noise floor below that which is required for the final product
Psychoacoustics
Sony-Philips Digital Interface Format (S/PDIF)
Footroom
Sample- and-Hold
14. Multi-Bit Words; (Pulse Code Modulation)
PCM
Stapedes Reflex
Audio over Ethernet (AoE)
Constant Bit Rate
15. (Time Based) Frequency: Aliasing; Anti-Aliasing Filter; Sample Rate; Nyquist Limit
Equal Loudness Contour
Lossy
X-Axis Terminology
Playback Buffering
16. 15.9 GB; DS/DL
Edit Decision List
DVD-18
Buffering Locations
Requirements for A/D Conversion
17. Uses entropy coding as the basis; Computer data compression algorithm that packages files such as .ZIP & .RAR
Latency
Rarefaction
Data Packing
Cutoff Frequency
18. Have odd numbered harmonics
Square Wave
Y-Axis Terminology
Normalizing
Frames
19. ADAT Optcal; 8- in/8- out on two cables; Fiber- optic - TOSLINK connector
Lightpipe
RMS
Threshold of Hearing
Acoustics
20. A sample- by- sample operation on two signals
Quantization
Convolution
Pass Band
D/A Conversion Signal Flow
21. 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
Glass Master
Index of Reflectivity
Zero-Latency Monitoring
22. 8- in/8- out on one cable; 25- pin D- sub connector
Tascam Digital Interface Format (TDIF)
Base 2 System
Index of Reflectivity
Audio Engineering Society
23. Branch of psychology concerned with the subjective perception of sound
Psychoacoustics
Square Wave
dB/FS
Base 2 System
24. Mixing data and control characters in a single operation
Interleaved
Physical Disc Format
Requirements for CD Audio
Motion Pictures Experts Group
25. The ability of a digital system to perform complex DSP without running into problems with overflow or loss of resolution
DVD-10
Conversion Buffering
Joint Stereo
Internal Resolution
26. Unit of measurement that is equal to one billionth of a meter
Data Packing
Optical Cable
Cutoff Frequency
Nanometer
27. Very quiet digital amplifier that produces a series of output pulses with the audio signal coded the same as the width of the output pulses; Pulses are used to represent wave forms and are either on or off; Intense signals have long pulses with short
Class - D Amplifier
2 Dimensions of Sound
Effective Bit Depth
Quantization
28. EDL; Final list of samples used in the audio editing process; Identified by time code
Algorithm
Edit Decision List
DVD-Audio
M-S Stereo
29. EBU
Frames
European Broadcasting Union
Joseph Fourier
Redither
30. 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
Stapedes Reflex
Coaxial
Recording Levels
Compression
31. High channel count; 64 channels on one cable; Coaxial cable with BNC connector or fiber optic with ST1 connector
Buffer Size
Lossless Formats
AoE Formats
Multichannel Audio Digital Interface (MADI)
32. The number of compressions or rarefactions in one second; The higher the frequency the more compressions & rarefactions per second; Measured in Hertz
EtherSound
A/D Conversion Signal Flow
Frequency
Lossless
33. Perceptual coding technique that uses louder sounds of a similar frequency to decide what information is to be saved during data reduction
Acoustics
Masking Analysis...
Zero-Latency Monitoring
2 Dimensions of Sound
34. 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
Threshold of Pain
Spectrum Multiplication
Optical Cable
Logical Format
35. Specific set of instructions for carrying out a data reduction technique that determines how to 'save' binary data information efficiently
Dolby 7.1
dBFS
Audio over Ethernet (AoE)
Algorithm
36. 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
Quantization Error
Fletcher- Munson Curve
Perceptual Coding
37. Number or variable that represents the number of times the base of a power is used as a factor; Defines magnitude
Stapedes Reflex
Pulse Code Modulation
Quantization Error
Exponent
38. 7.95 GB; SS/DL
Frequency
DVD-9
Pad Head & Tail
Noise Shaping
39. Measuring equipment in A/D conversion that processes voltage and provides a value for that voltage
Speed of Sound
Bit Depth Effect on Dynamic Range
Decimal- to-Binary Conversion
Quantizer
40. 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
Cutoff Frequency
Lossy
Pad Head & Tail
Oversampling
41. Computer program or device capable of encoding and/or decoding a digital data stream with the end result being a reduced file size
Codec
Logical Format
Requirements for CD Audio
Edit Decision List
42. CBR; Codecs encodes data at a constant rate regardless of density of the audio file
Constant Bit Rate
Photoreceptor
Entropy Coding
Dynamic Range
43. 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
Spectrum Multiplication
Foldover
Decimation Filter
Glass Master
44. Lossless Format; Can hold up to 25GB on a single- layer disc and 50GB on a dual- layer disc
Storage Conversion Steps
Blu-Ray
Joseph Fourier
Anti-Aliasing Filter
45. 1st commercially successful AoE format for the transmission of digital audio - video - and control signals over 64- channel 100Mbps Ethernet networks
CobraNet
DVD-9
AoE Formats
Word Clock
46. Defines the number of sample per second taken from a continuous signal to make a discrete signal; Governs the frequency response of digital audio
Sampling Rule
Spectra
Transfer Protocol
Sample Rate
47. Built into DAWs; Bits are added when signals are mixed together to avoid clipping
Headroom Bits
Intensity Stereo
Spectrum Multiplication
Compression
48. 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
Low-Latency Monitoring
Claude Shannon
Sonogram
Interleaved
49. Reference voltage determined by summing the voltage values of a predetermined number of previous samples; Numbers of 1 in row = waveform peak; Numbers of 0 in row = waveform trough; Basis of Sony's Direct Stream Digital (DSD)
Recording Levels
Sinusoidal
Signal- to- Noise Ratio
Pulse Density Modulation
50. Splits the input signal and mixes it with an analog copy so that no latency is present
Zero-Latency Monitoring
Analog
Overflow
Micron