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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. Digital Word -> Series of Resistors (each with assigned charges) -> Sample- and-Hold Circuit -> Anti-Imaging Filter (Smoothing Filter) -> Reconstructed Sample
dB/SPL
Anti-Aliasing Filter
Noise Shaping
D/A Conversion Signal Flow
2. EBU
dB/SPL
Bit Depth
Peak Level
European Broadcasting Union
3. Based on Full Scale (dB/FS); -6dB represents a loss of one bit so account for this when calculating
Effective Bit Depth
Latency
Square Wave
DVD-18
4. When recording you want the smallest buffer available; When mixing you want the largest buffer available
Glass Master
A/D Conversion Signal Flow
Buffer Size
Coaxial
5. 15.9 GB; DS/DL
DVD-18
Dithering
Compression
Noise Shaping
6. MPEG; Standardizing body of audio coding
Sampling (Samples)
RMS Meter
Base 2 System
Motion Pictures Experts Group
7. A method of representing real numbers using a mantissa and an exponent
Floating Point
Zero-Latency Monitoring
Algorithm
I/O Connection Buffering
8. 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
Frequency
Square Wave
X-Axis Terminology
9. High Pressure - Part of a longitudinal wave where the particles of the medium are close together
Compression
M-S Stereo
Threshold of Pain
RMS
10. ADPCM; Pulse code modulation that produces a digital signal with a lower bit rate than standard PCM; Records only the difference between samples
Logical Format
Optical Cable
Adaptive Pulse Code Modulation
Decimal- to-Binary Conversion
11. Measure of sound pressure over the frequency spectrum - for which a listener perceives a constant loudness when presented with pure steady tones
Equal Loudness Contour
DVD-18
Additive Synthesis...
Dolby 5.1
12. Very selective method of lowering buffer levels by halting different levels of audio processing
Harmonic Content
Blu-Ray
Low-Latency Monitoring
Bit Depth Effect on Dynamic Range
13. Roughly around 1 -130 ft/s
Oversampling
DVD-14
Speed of Sound
Sinusoidal
14. 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
Dolby 7.1
Variable Bit Rate
AES3
Gain Staging
15. Circuit that seizes voltage values with each tick of an A/D device's internal clock
Gain Staging
Attenuation
dB/SPL
Sample- and-Hold
16. The frequency above or below which attenuation begins in a filter circuit
Cutoff Frequency
DVD-5
Ethernet
CobraNet
17. Number of bits used to represent the smallest unit of information in an audio file; Greater bit depth = better quality audio
Equal Loudness Contour
Footroom
Foldover
Bit Depth
18. Twice as many samples as the highest frequency at minimum; Sampling rate totally controls frequency response
Inter-Channel Redundancy
Headroom Bits
Buffering Locations
Sampling Rule
19. Ultra low- latency - 512- channel (on a gigabit network) - less flexible AoE format; Routed like audio cables...not network cables
EtherSound
Aliasing
Word Clock
Footroom
20. The act of a frequency swinging back and forth with a steady - uninterrupted rhythm
Lossless
Digital Signal Processing
Oscillation
Zero-Latency Monitoring
21. Measuring equipment in A/D conversion that processes voltage and provides a value for that voltage
Decimation Filter
Storage Conversion Steps
Lossy
Quantizer
22. 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
Glass Master
Blu-Ray
Analog
Buffering
23. 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
Sinusoidal
Nyquist Frequency
Quantization
DVD-10
24. Based on psychoacoustics - these are the basis of frequency analysis for a perceptual codec;
Rarefaction
CobraNet
Subbands
Decimation Filter
25. Defines the number of sample per second taken from a continuous signal to make a discrete signal; Governs the frequency response of digital audio
D/A Conversion Signal Flow
Adaptive Pulse Code Modulation
Sample Rate
Compression
26. AAC (Advanced Audio Coding); MP3; RA; WMA; OGG Vorbis; Dolby Digital/AC-3; DTS; ADPCM
Lossy Formats
Oversampling
M-S Stereo
Digital
27. Circuit that interprets the meaning of the symbols as they were chosen and arranged by the encode
D/A Conversion
Tascam Digital Interface Format (TDIF)
Frequency
Decoder
28. Method of representing an acoustic quantity with a series of binary numbers; Can have only specific individually distinct values
Sample Rate Effect on Anti-Aliasing
Transfer Protocol
Digital
Codec
29. 1.) Taking a series of evenly- spaced measurements 2.) Signal contains no frequency components higher than half the sample rate
Convolution
Requirements for A/D Conversion
Zero-Latency Monitoring
Significand
30. Computer program or device capable of encoding and/or decoding a digital data stream with the end result being a reduced file size
Sonogram
Codec
Digital
Dolby 7.1
31. Each bit in the bit depth is equal to a _____ increase in dynamic range
Sampling Rule
DVD-5
6 dB
Variable Bit Rate
32. Algorithm uses matrix of a mid/side microphone pair to determine a side signal & that signal is reduced then distributed as code in stereo
Sinusoidal
A/D Conversion
M-S Stereo
Sine Wave
33. Overtones that contribute to the timbre of a sound and make up a complex waveform's physical characteristics
Lossless
Audio over Ethernet (AoE)
Quantization Intervals
Harmonic Content
34. Splits the input signal and mixes it with an analog copy so that no latency is present
Zero-Latency Monitoring
A/D Conversion Signal Flow
Photoreceptor
Quantization Error
35. Apple Lossless; Windows Media Lossless; DTS HD Master Audio; Dolby True HD; FLAC
Lossless Formats
Sinusoidal
PCM
D/A Conversion Signal Flow
36. 4.38 GB; SS/SL
Blu-Ray
Y-Axis Terminology
Edit Decision List
DVD-5
37. Smallest interval measurable by a scientific instrument; Defined by bit rate (sample rate x bit depth)
Intensity Stereo
EtherSound
Sampling (Samples)
Resolution
38. Rate at which energy is drawn from a source that produces a flow of electricity in a circuit; Expressed in volts
DVD-5
Voltage
PCM
Spectrum Multiplication
39. (Time Based) Frequency: Aliasing; Anti-Aliasing Filter; Sample Rate; Nyquist Limit
CobraNet
Tascam Digital Interface Format (TDIF)
X-Axis Terminology
Analog
40. Fractional part of a floating- point number; Also called the mantissa; Defines precision
Significand
AoE Formats
Class - D Amplifier
Quantizer
41. 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
0 dB FS
SCMS
Nanometer
Morse Code
42. 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
Sample Rate Effect on Anti-Aliasing
Oversampling
Base 2 System
Redither
43. 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)
Fletcher- Munson Curve
SACD
Resolution
Latency
44. Decibels Full Scale
Convolution
dBFS
Anti-Aliasing Filter
Compression
45. The continuous loss of signal strengths as a signal travels through a medium
Recording Levels
Attenuation
Floating Point
Entropy Coding
46. CobraNet; EtherSound; Dante; AVB (currently under development)
Noise Shaping
D/A Conversion Signal Flow
AoE Formats
Algorithm
47. Uses entropy coding as the basis; Computer data compression algorithm that packages files such as .ZIP & .RAR
Data Packing
Inter-Channel Redundancy
M-S Stereo
Joint Stereo
48. Found that aliasing was always a problem no matter how fast you sample; Less data recorded but more accurate; 2 samples per wave length.
Transfer Protocol
Harry Nyquist
Entropy Coding
Anti-Imaging Filter
49. Mixing data and control characters in a single operation
EtherSound
Joint Stereo
Interleaved
Sine Wave
50. Single- pin RCA cable or fiber- optic TOSLINK connector used for digital transfer; 75O coaxial - 2- channel unbalanced; 'Consumer' format of AES3
Sony-Philips Digital Interface Format (S/PDIF)
Decimal- to-Binary Conversion
A/D Conversion Signal Flow
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