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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. 'Reconstructing' part of digital audio
Entropy Coding
D/A Conversion
Variable Bit Rate
Blu-Ray
2. 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
Sine Wave
Nyquist Frequency
European Broadcasting Union
Threshold of Pain
3. Ratio of magnitude of the analytical signal to the magnitude of the background noise signal
Exponent
Signal- to- Noise Ratio
Speed of Sound
Interpolation Filter
4. 12.33 GB; DS/ML
Buffering
Conversion Buffering
DVD-14
AoE Formats
5. Measure of the amplitude of a longitudinal wave
Intensity
Jitter
Requirements for A/D Conversion
Lossless Formats
6. The continuous loss of signal strengths as a signal travels through a medium
DVD-Audio
A/D Conversion Signal Flow
Glass Master
Attenuation
7. Six channel (five speakers and one subwoofer for bass) digital surround sound system by Dolby
Dolby 5.1
Buffering Locations
AoE Formats
Oversampling
8. Waveform of a pure tone showing simple harmonic motion
Blu-Ray
Overflow
Signal- to- Noise Ratio
Sine Wave
9. The ability of a digital system to perform complex DSP without running into problems with overflow or loss of resolution
Equal Loudness Contour
EtherSound
Internal Resolution
Fletcher- Munson Curve
10. Allowance of noise floor below that which is required for the final product
Normalizing
Sine Wave
Recording Levels
Footroom
11. Having a repeated succession of waves or curves as in a sound waveform
Audio Engineering Society
Sinusoidal
Non -Compressed Audio Data Rate Formula
Glass Master
12. EBU
Attenuation
Morse Code
Rarefaction
European Broadcasting Union
13. Eliminates frequencies above the Nyquist limit from becoming samples; Occurs prior to quantization
Codec
Buffering Locations
Data Packing
Anti-Aliasing Filter
14. Decibels Full Scale
DVD-14
Amplitude Accuracy
EtherSound
dBFS
15. 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
Ethernet
Pulse Density Modulation
Jitter
Exponent
16. 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
Compression
Pulse Code Modulation
Threshold of Hearing
Conversion Buffering
17. 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
Sample Rate Effect on Anti-Aliasing
Y-Axis Terminology
Pass Band
Cutoff Frequency
18. CBR; Codecs encodes data at a constant rate regardless of density of the audio file
Coaxial
Constant Bit Rate
Requirements for CD Audio
Impulse Response
19. 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
Psychoacoustics
Spectrum Multiplication
CPU Buffering
Non -Compressed Audio Data Rate Formula
20. 15.9 GB; DS/DL
Cutoff Frequency
DVD-18
Inter-Channel Redundancy
Logical Format
21. The act of a frequency swinging back and forth with a steady - uninterrupted rhythm
Stapedes Reflex
Sample Rate
Oscillation
Frames
22. Twice as many samples as the highest frequency at minimum; Sampling rate totally controls frequency response
Index of Reflectivity
Bit Rate
Variable Bit Rate
Sampling Rule
23. 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
Successive Approximation
AoE Formats
Cutoff Frequency
Sony-Philips Digital Interface Format (S/PDIF)
24. Also known as equal loudness curves; Graph that indicates the average ear sensitivity to different frequencies at different SPL levels (as volume increases - these curves flatten out)
Lossy Formats
CPU Buffering
D/A Conversion Signal Flow
Fletcher- Munson Curve
25. Found that aliasing was always a problem no matter how fast you sample; Less data recorded but more accurate; 2 samples per wave length.
Masking Analysis...
Harry Nyquist
I/O Connection Buffering
Digital
26. Sample Rate x Bit Depth x # of Channels
Joseph Fourier
AES3
Non -Compressed Audio Data Rate Formula
Foldover
27. RAM holds in memory audio data before it is transferred to the memory controller; Certain amount of data is processed before large amounts of data are streamed to prevent latency
Spectra
dB/FS
Lossless
Buffering
28. Inner ear component that attaches to the stapes and helps to decrease the amplitude of vibrations; Causes the masking phenomenon
Glass Master
Stapedes Reflex
Edit Decision List
Psychoacoustics
29. Circuit that seizes voltage values with each tick of an A/D device's internal clock
D/A Conversion
DVD-18
Decimation Filter
Sample- and-Hold
30. Unit of measurement that is equal to one billionth of a meter
Class - D Amplifier
Digital
Nanometer
Footroom
31. The difference in volume between the loudest and quietest sounds of a source
Transfer Protocol
Dynamic Range
Effective Bit Depth
D/A Conversion
32. Built into DAWs; Bits are added when signals are mixed together to avoid clipping
Frames
Sample- and-Hold
Headroom Bits
M-S Stereo
33. Circuit that interprets the meaning of the symbols as they were chosen and arranged by the encode
Motion Pictures Experts Group
Decoder
Equal Loudness Contour
Threshold of Pain
34. The mathematics - algorithms - and the techniques used to manipulate signals after they have been converted to digital form
Claude Shannon
Playback Buffering
Digital Signal Processing
A/D Conversion Signal Flow
35. 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
RMS Meter
CPU Buffering
Spectrum Multiplication
Sampling (Samples)
36. Rate at which energy is drawn from a source that produces a flow of electricity in a circuit; Expressed in volts
Dynamic Range
Voltage
EtherSound
Internal Resolution
37. Signal that uses variable voltage to create continuous waves resulting in an inexact transmission
Sample Rate
Sawtooth Wave
Analog
Lossy Formats
38. Overtones that contribute to the timbre of a sound and make up a complex waveform's physical characteristics
Harmonic Content
Requirements for CD Audio
RMS
Glass Master
39. 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
Variable Bit Rate
Lossless
Headroom Bits
Stapedes Reflex
40. How Loud (Y-Axis) & How Fast (X-Axis)
2 Dimensions of Sound
Bit Depth
Decoder
Inter-Channel Redundancy
41. Digital and analog processing capability is combined on a single microchip allowing for 1- bit resolution at high sample rates
Delta-Sigma Modulation
European Broadcasting Union
Coaxial
Sampling Rule
42. The loudest point of a Full Scale system
Pulse Code Modulation
Buffer Size
Index of Reflectivity
0 dB FS
43. The frequency above or below which attenuation begins in a filter circuit
Threshold of Pain
Cutoff Frequency
Pass Band
6 dB
44. 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
Pad Head & Tail
Nyquist Frequency
Sampling Rule
Coaxial
45. A sample- by- sample operation on two signals
DVD-18
D/A Conversion Signal Flow
Convolution
Blu-Ray
46. ADAT Optcal; 8- in/8- out on two cables; Fiber- optic - TOSLINK connector
2 Dimensions of Sound
Attenuation
Lightpipe
DVD-14
47. Subtract place values from the decimal number and place ones or zeros in the correct places
Anti-Imaging Filter
Intensity Stereo
Decimal- to-Binary Conversion
Subbands
48. 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
Sonogram
Buffering
Floating Point
49. Unit of measurement that is equal to one millionth of a meter
Sony-Philips Digital Interface Format (S/PDIF)
Micron
DVD-Audio
Playback Buffering
50. Data reduction technique that does not effect quality of original audio; No effect on original quality; Typically around 50% reduction; Exact reconstruction of digital code for the audio signal
Glass Master
Anti-Imaging Filter
Psychoacoustics
Lossless