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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. AAC (Advanced Audio Coding); MP3; RA; WMA; OGG Vorbis; Dolby Digital/AC-3; DTS; ADPCM
Pulse Width Modulation
Sample Rate
Lossy Formats
Nyquist Frequency
2. 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
Dolby 7.1
Pulse Width Modulation
Interpolation Filter
Dithering
3. The loudest point of a Full Scale system
Physical Disc Format
0 dB FS
Sampling Theorem
Edit Decision List
4. Eight channel digital surround sound system by Dolby
Dolby 7.1
Fidelity
Edit Decision List
RMS Meter
5. Measure of sound pressure over the frequency spectrum - for which a listener perceives a constant loudness when presented with pure steady tones
Oversampling
Dithering
Adaptive Pulse Code Modulation
Equal Loudness Contour
6. Number or variable that represents the number of times the base of a power is used as a factor; Defines magnitude
Exponent
Psychoacoustics
Lightpipe
0 dB FS
7. Based on Full Scale (dB/FS); -6dB represents a loss of one bit so account for this when calculating
Signal- to- Noise Ratio
CobraNet
Data Packing
Effective Bit Depth
8. More accuracy in low amplitudes and less in higher amplitudes
Amplitude Accuracy
Effective Bit Depth
Motion Pictures Experts Group
Square Wave
9. The process of reducing the space required to store data by efficiently encoding the content.
Glass Master
Rarefaction
Compression
Low-Latency Monitoring
10. Describes acceptable data - performances both offered and essential for a disc player - and the complete user experience
Logical Format
DVD-14
Oversampling
Algorithm
11. Allows for an internal sample rate at multiples of the input and output rates; Alleviates the need for steep 'brickwall' filters; Often combined with internal '1- bit' processing; Increases smoothing effect
SCMS
Floating Point
DVD-10
Oversampling
12. Low Pressure; Part in a longitudinal wave where the particles are spread apart
Rarefaction
European Broadcasting Union
Bit Rate
Normalizing
13. 12cm plastic disc; 1.2mm thick; One- sided; Red Laser; 1.6 microns between tracks; 125 nanometer pits
Lossless Formats
D/A Conversion
RMS Meter
Red Book
14. 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
Audio over Ethernet (AoE)
Class - D Amplifier
Oversampling
Buffering
15. EDL; Final list of samples used in the audio editing process; Identified by time code
Masking Analysis...
Edit Decision List
Fletcher- Munson Curve
Class - D Amplifier
16. CBR; Codecs encodes data at a constant rate regardless of density of the audio file
Constant Bit Rate
Foldover
Spectrum Multiplication
Entropy Coding
17. The difference in volume between the loudest and quietest sounds of a source
DVD-Audio
Dynamic Range
Frequency
Harmonic Content
18. Twice as many samples as the highest frequency at minimum; Sampling rate totally controls frequency response
Sampling Rule
Variable Bit Rate
Oversampling
Successive Approximation
19. Very selective method of lowering buffer levels by halting different levels of audio processing
Bit Depth Effect on Dynamic Range
Low-Latency Monitoring
Frames
Harmonic Content
20. 15.9 GB; DS/DL
Oversampling
Low-Latency Monitoring
DVD-18
Red Book
21. 1.) Bit Rate x Sample Rate (you'll get b/sec) 2.) Multiply by 60 if converting seconds to minutes 3.) Divide by 8 to convert bits to Bytes and get B/min 4.) Divide by 1 -024 to get KB/min and keep doing it until you get desired bit rate specification
Stapedes Reflex
Index of Reflectivity
A/D Conversion Signal Flow
Storage Conversion Steps
22. A sample- by- sample operation on two signals
Glass Master
Morse Code
Redither
Convolution
23. A drive that can read and write on optical media that hold up to 50 GB on two layers; 24- bit/96 kHz for 8-Channel; 24- bit/192 kHz for 6-Channel
Redither
Impulse Response
Blu-Ray
Foldover
24. 8.75 GB; DS/SL
Buffer Size
Micron
DVD-10
Fourier Series
25. A situation where a calculated value cannot fit into the number of digits reserved for it
Overflow
Sinusoidal
Dynamic Range
Requirements for CD Audio
26. HD Audio format; Lossless Compression; 24- bit/96 kHz; 5.1 Surround or 24- bit / 192 kHz stereo sound
Additive Synthesis...
Intensity Stereo
DVD-Audio
Sample Rate Effect on Anti-Aliasing
27. 'Capturing' part of digital audio; Never captures a signal perfectly
Oversampling
Sony-Philips Digital Interface Format (S/PDIF)
Requirements for A/D Conversion
A/D Conversion
28. Multi-Bit Words; (Pulse Code Modulation)
Sinusoidal
Direct Stream Digital
PCM
Transfer Protocol
29. Rate at which energy is drawn from a source that produces a flow of electricity in a circuit; Expressed in volts
TOSLINK
Oscillation
Voltage
Dithering
30. Used when the reference pressure of a sound is 20 microPa (0.00002); Sound Pressure Level; Measure of amplitude
dB/SPL
Convolution
Psychoacoustics
Buffer Size
31. Inner ear component that attaches to the stapes and helps to decrease the amplitude of vibrations; Causes the masking phenomenon
Fidelity
Stapedes Reflex
Optical Cable
Frequency
32. The art of deciding where to place a processor in signal flow based on how that processor will be influenced by the other processors in the path
Gain Staging
Stapedes Reflex
SCMS
Algorithm
33. 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
Stapedes Reflex
Algorithm
Successive Approximation
SCMS
34. Signal that uses variable voltage to create continuous waves resulting in an inexact transmission
Analog
2 Dimensions of Sound
dB/SPL
Decimal- to-Binary Conversion
35. 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.
Spectrum Multiplication
M-S Stereo
Effective Bit Depth
Aliasing
36. The act of a frequency swinging back and forth with a steady - uninterrupted rhythm
MONO
Class - D Amplifier
Oscillation
Spectra
37. Number of bits per second processed when sampling sound; (Sampling Rate x Bit Depth) = Resolution
X-Axis Terminology
Constant Bit Rate
Sonogram
Bit Rate
38. Sum of all harmonics; Sum of sine and cosine waves which have frequencies f - 2f - 3f - 4f...
Fourier Series
Psychoacoustics
Pulse Width Modulation
DVD-Audio
39. Electromagnetic receptor that detects the radiation known as visible light
Aliasing
Photoreceptor
Digital
Analog
40. The frequency range that is allowed through a filter
Playback Buffering
Pass Band
Voltage
Sonogram
41. 1.) Taking a series of evenly- spaced measurements 2.) Signal contains no frequency components higher than half the sample rate
Requirements for A/D Conversion
Threshold of Hearing
Conversion Buffering
Successive Approximation
42. Branch of psychology concerned with the subjective perception of sound
Psychoacoustics
Photoreceptor
Pulse Width Modulation
Compression
43. Measure of the amplitude of a longitudinal wave
RMS
Red Book
Intensity
Class - D Amplifier
44. A digital filter's time domain output sequence when the input is a single sample is input
Impulse Response
Coaxial
Physical Disc Format
Index of Reflectivity
45. 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
Acoustics
Effective Bit Depth
Bit Depth
46. Stores only one copy of a stereo signal and assigns it to both channels in order to save 50% of original bandwidth
Dithering
Inter-Channel Redundancy
CobraNet
Average Bit Rate
47. Softest sound that can be heard by the average human ear (0 dB)
Anti-Imaging Filter
MONO
Compression
Threshold of Hearing
48. 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
Physical Disc Format
Harmonic Content
Intensity Stereo
49. Contains all even and odd harmonics associated with a fundamental tone - making it a rich source for modeling other sounds; Amplitude of each overtone decreases exponentially as a ratio of the harmonic's frequency to that of the fundamental
Harmonic Content
Oversampling
Acoustics
Sawtooth Wave
50. If a signal is sampled at a rate higher than twice the highest significant signal frequency and at evenly spaced intervals - then the samples contain all the information of the original signal
Sampling Theorem
Nyquist Frequency
Quantization Intervals
Oscillation