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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. The frequency above or below which attenuation begins in a filter circuit
Buffering
Cutoff Frequency
Bit Depth Effect on Dynamic Range
DVD-14
2. Waveform of a pure tone showing simple harmonic motion
Successive Approximation
Fourier Series
Sine Wave
Masking Analysis...
3. Level above which audible sounds are painful (125 - 130 db)
Threshold of Pain
Jitter
Intensity
Inter-Channel Redundancy
4. Decibels Full Scale
dBFS
Codec
DVD-9
Dithering
5. Overtones that contribute to the timbre of a sound and make up a complex waveform's physical characteristics
Rarefaction
Index of Reflectivity
Audio Engineering Society
Harmonic Content
6. Sum of all harmonics; Sum of sine and cosine waves which have frequencies f - 2f - 3f - 4f...
Fourier Series
A/D Conversion Signal Flow
Aliasing
Tascam Digital Interface Format (TDIF)
7. Eight channel digital surround sound system by Dolby
Sampling Rule
Interleaved
Dolby 7.1
Quantization
8. 16-Bit; 44.1 kHz; PCM; Stereo
Footroom
Requirements for CD Audio
Sampling (Samples)
Harry Nyquist
9. 1.) Taking a series of evenly- spaced measurements 2.) Signal contains no frequency components higher than half the sample rate
Ethernet
Stapedes Reflex
Blu-Ray
Requirements for A/D Conversion
10. Ultra low- latency - 512- channel (on a gigabit network) - less flexible AoE format; Routed like audio cables...not network cables
Nanometer
Harmonic Content
A/D Conversion
EtherSound
11. ADAT Optcal; 8- in/8- out on two cables; Fiber- optic - TOSLINK connector
PCM
Stapedes Reflex
Successive Approximation
Lightpipe
12. AAC (Advanced Audio Coding); MP3; RA; WMA; OGG Vorbis; Dolby Digital/AC-3; DTS; ADPCM
Frequency
European Broadcasting Union
Sinusoidal
Lossy Formats
13. The difference between the analog value and the approximated digital value due to the 'rounding' that occurs while converting the analog signal to digital
Transfer Protocol
Sample Rate
Interleaved
Quantization Error
14. Sony and Philips optical disc format; Utilizes sigma delta DSD to offer higher resolution; 1- bit; 2.8224 MHz; 6-Channel
Lossless Formats
Zero-Latency Monitoring
Direct Stream Digital
SACD
15. 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
Fourier Series
Nanometer
Foldover
Buffering
16. High Pressure - Part of a longitudinal wave where the particles of the medium are close together
dB/FS
Buffering
Spectra
Compression
17. Take up half as many bits (50%); Algorithm can keep same quality by lossing the stereo track
Quantization
MONO
Compression
Transfer Protocol
18. (Amplitude Based) Amplitude: Voltage; Quantization; Bit Depth; Quantization Intervals; Quantization Noise; [Signal:Quantization Noise Ratio]; Dither; Dynamic Range
Y-Axis Terminology
Harry Nyquist
Sony-Philips Digital Interface Format (S/PDIF)
DVD-9
19. Six channel (five speakers and one subwoofer for bass) digital surround sound system by Dolby
Frames
Signal- to- Noise Ratio
Conversion Buffering
Dolby 5.1
20. A sample- by- sample operation on two signals
Codec
Sampling Rule
Convolution
Playback Buffering
21. Unit of measurement that is equal to one millionth of a meter
Micron
Word Clock
Dolby 7.1
DVD-10
22. Each bit in the bit depth is equal to a _____ increase in dynamic range
Compression
2 Dimensions of Sound
Successive Approximation
6 dB
23. A frequency specified for a filter (digital or electronic) the marks the point at which the frequency content of a signal is altered +/- 3dB
Average Bit Rate
Audio Engineering Society
Cutoff Frequency
Peak Level
24. Reduces A/D sample rate from the oversampled rate to nominal rate by turning series of one- bit samples into a series of multi- bit PCM samples; (ex. => 2.8MHz sample rate converted to 44.1kHz and simultaneously converts 1-Bit samples to multi- bit);
Multichannel Audio Digital Interface (MADI)
Lightpipe
Requirements for A/D Conversion
Decimation Filter
25. Serial Copy Management System; main difference between AES3 & S/PIDF
Dolby 7.1
Delta-Sigma Modulation
Quantization
SCMS
26. 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
Square Wave
Adaptive Pulse Code Modulation
CPU Buffering
Sinusoidal
27. Electromagnetic receptor that detects the radiation known as visible light
Photoreceptor
Variable Bit Rate
Bit Depth
Algorithm
28. Measure of sound pressure over the frequency spectrum - for which a listener perceives a constant loudness when presented with pure steady tones
Pulse Density Modulation
Equal Loudness Contour
Internal Resolution
DVD-18
29. Snippets of time in which frequency analysis takes place in a perceptual codec
Low-Latency Monitoring
Frames
European Broadcasting Union
A/D Conversion
30. ADPCM; Pulse code modulation that produces a digital signal with a lower bit rate than standard PCM; Records only the difference between samples
Pulse Density Modulation
Adaptive Pulse Code Modulation
Signal- to- Noise Ratio
Low-Latency Monitoring
31. Circuit that seizes voltage values with each tick of an A/D device's internal clock
Sampling Rule
DVD-5
Sample- and-Hold
PCM
32. Rate at which energy is drawn from a source that produces a flow of electricity in a circuit; Expressed in volts
CobraNet
TOSLINK
Equal Loudness Contour
Voltage
33. Signal conversions are mixed with playback tracks resulting in near-zero latency
Anti-Aliasing Filter
Direct Monitoring
Peak Level
Cutoff Frequency
34. 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
Lossless
Interpolation Filter
Footroom
Motion Pictures Experts Group
35. Roughly around 1 -130 ft/s
Zero-Latency Monitoring
Speed of Sound
Joseph Fourier
Index of Reflectivity
36. 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
Optical Cable
Masking Analysis...
Audio over Ethernet (AoE)
Quantization Error
37. 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)
CPU Buffering
Zero-Latency Monitoring
Bit Depth Effect on Dynamic Range
Pulse Density Modulation
38. 7.95 GB; SS/DL
Foldover
DVD-9
Algorithm
Joint Stereo
39. Digital and analog processing capability is combined on a single microchip allowing for 1- bit resolution at high sample rates
Delta-Sigma Modulation
Amplitude Accuracy
DVD-18
Audio over Ethernet (AoE)
40. 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
Oversampling
DVD-18
TOSLINK
41. 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)
Signal- to- Noise Ratio
Decimation Filter
Sampling Theorem
Fletcher- Munson Curve
42. A network communications protocol that specifies how machines will exchange data; Uses a broadcast system in which one machine transmits its message on the communication medium and the other machines listen for messages directed to them
Base 2 System
Ethernet
Signal- to- Noise Ratio
Redither
43. Ratio of magnitude of the analytical signal to the magnitude of the background noise signal
Red Book
Spectra
Signal- to- Noise Ratio
Successive Approximation
44. When recording you want the smallest buffer available; When mixing you want the largest buffer available
Spectrum Multiplication
Buffer Size
Index of Reflectivity
Sampling (Samples)
45. How Loud (Y-Axis) & How Fast (X-Axis)
2 Dimensions of Sound
Significand
Amplitude Accuracy
Bit Depth Effect on Dynamic Range
46. Removes high frequency images and noise and smoothes the stair case output coming from of the sample and hold circuit; Also called a SMOOTHING FILTER
Class - D Amplifier
Anti-Imaging Filter
A/D Conversion Signal Flow
Interleaved
47. Mixing data and control characters in a single operation
Morse Code
Word Clock
Bit Rate
Interleaved
48. 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.
Nyquist Frequency
Intensity Stereo
Aliasing
Foldover
49. Visual graph that shows how loud a sound is at different frequencies
Sonogram
Intensity Stereo
Nanometer
Micron
50. More aggressive lossy data reduction techniques that require further manipulation of the stereo field; Examples are 'Intensity' & 'M-S'
MONO
Footroom
Rarefaction
Joint Stereo