SUBJECTS
|
BROWSE
|
CAREER CENTER
|
POPULAR
|
JOIN
|
LOGIN
Business Skills
|
Soft Skills
|
Basic Literacy
|
Certifications
About
|
Help
|
Privacy
|
Terms
|
Email
Search
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. Describes acceptable data - performances both offered and essential for a disc player - and the complete user experience
DVD-5
Sonogram
Intensity
Logical Format
2. 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
Motion Pictures Experts Group
I/O Connection Buffering
Class - D Amplifier
Pass Band
3. Root Mean Square; Refers to taking the square root of all instantaneous amplitudes; Takes the average of those squares; (-6 Peak Level is approximately equal to -20 RMS)
Voltage
Variable Bit Rate
RMS
Noise Shaping
4. High Pressure - Part of a longitudinal wave where the particles of the medium are close together
Compression
Foldover
Headroom Bits
Conversion Buffering
5. Take up half as many bits (50%); Algorithm can keep same quality by lossing the stereo track
Requirements for CD Audio
Buffering
MONO
Sample Rate
6. EBU
Glass Master
European Broadcasting Union
I/O Connection Buffering
Direct Monitoring
7. 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
Quantization
RMS
DVD-18
Storage Conversion Steps
8. How Loud (Y-Axis) & How Fast (X-Axis)
Average Bit Rate
2 Dimensions of Sound
dB/FS
Pad Head & Tail
9. Found that aliasing was always a problem no matter how fast you sample; Less data recorded but more accurate; 2 samples per wave length.
Foldover
Bit Rate
Harry Nyquist
Motion Pictures Experts Group
10. 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
Overflow
Sampling Rule
Lossy
D/A Conversion Signal Flow
11. 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);
Joint Stereo
dBFS
Decimation Filter
Foldover
12. A situation where a calculated value cannot fit into the number of digits reserved for it
Jitter
Conversion Buffering
Interleaved
Overflow
13. 15.9 GB; DS/DL
Variable Bit Rate
DVD-18
Photoreceptor
Pad Head & Tail
14. Uses entropy coding as the basis; Computer data compression algorithm that packages files such as .ZIP & .RAR
Data Packing
Constant Bit Rate
Sampling (Samples)
Nyquist Frequency
15. Mixing data and control characters in a single operation
Interleaved
Bit Rate
DVD-14
Variable Bit Rate
16. French mathematician that noted that any complex sound can be broken down into a series of component pure tones
6 dB
Recording Levels
Joseph Fourier
Dolby 5.1
17. 12cm plastic disc; 1.2mm thick; One- sided; Red Laser; 1.6 microns between tracks; 125 nanometer pits
CobraNet
Variable Bit Rate
Entropy Coding
Red Book
18. 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
Jitter
Dolby 5.1
Fletcher- Munson Curve
Interpolation Filter
19. ADAT Optcal; 8- in/8- out on two cables; Fiber- optic - TOSLINK connector
Lightpipe
Playback Buffering
Sample Rate Effect on Anti-Aliasing
Acoustics
20. 7.95 GB; SS/DL
Rarefaction
DVD-10
DVD-9
Sine Wave
21. Multi-Bit Words; (Pulse Code Modulation)
PCM
European Broadcasting Union
Spectrum Multiplication
Equal Loudness Contour
22. HD Audio format; Lossless Compression; 24- bit/96 kHz; 5.1 Surround or 24- bit / 192 kHz stereo sound
Masking Analysis...
Quantization Intervals
dB/SPL
DVD-Audio
23. 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
Aliasing
RMS Meter
DVD-18
Micron
24. Twice as many samples as the highest frequency at minimum; Sampling rate totally controls frequency response
Decoder
Constant Bit Rate
Sampling Rule
Multichannel Audio Digital Interface (MADI)
25. Apple Lossless; Windows Media Lossless; DTS HD Master Audio; Dolby True HD; FLAC
Lossless Formats
Voltage
Normalizing
Speed of Sound
26. The difference in volume between the loudest and quietest sounds of a source
Dynamic Range
Pad Head & Tail
A/D Conversion
Impulse Response
27. CobraNet; EtherSound; Dante; AVB (currently under development)
Sinusoidal
AoE Formats
Threshold of Pain
Latency
28. 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
Blu-Ray
Floating Point
Pulse Code Modulation
Requirements for A/D Conversion
29. Circuit that seizes voltage values with each tick of an A/D device's internal clock
Playback Buffering
Dolby 7.1
Sample- and-Hold
Subbands
30. Used when the reference pressure of a sound is 20 microPa (0.00002); Sound Pressure Level; Measure of amplitude
Effective Bit Depth
dB/SPL
Entropy Coding
DVD-14
31. Branch of psychology concerned with the subjective perception of sound
A/D Conversion
0 dB FS
Psychoacoustics
Floating Point
32. The more bits allocated during quantization - the more accurate the measurement
I/O Connection Buffering
Bit Depth Effect on Dynamic Range
Cutoff Frequency
RMS
33. A time regulator that makes all samples and bits to align when working with interconnected digital devices; Basically a signal that all of the digital devices refer to when operating.
Cutoff Frequency
Word Clock
Blu-Ray
Frequency
34. 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
Playback Buffering
Variable Bit Rate
Cutoff Frequency
0 dB FS
35. Measuring equipment in A/D conversion that processes voltage and provides a value for that voltage
Noise Shaping
Quantizer
Joseph Fourier
Data Packing
36. The number of compressions or rarefactions in one second; The higher the frequency the more compressions & rarefactions per second; Measured in Hertz
Lossless
Playback Buffering
Frequency
Aliasing
37. Algorithm uses matrix of a mid/side microphone pair to determine a side signal & that signal is reduced then distributed as code in stereo
MONO
M-S Stereo
Jitter
I/O Connection Buffering
38. Toshiba developed digital audio interface utilizes fiber optics as a transmission medium.
RMS
TOSLINK
Additive Synthesis...
SCMS
39. 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
AES3
Playback Buffering
Sampling Theorem
Variable Bit Rate
40. More accuracy in low amplitudes and less in higher amplitudes
Signal- to- Noise Ratio
Spectrum Multiplication
Playback Buffering
Amplitude Accuracy
41. Having a repeated succession of waves or curves as in a sound waveform
Direct Stream Digital
Pulse Width Modulation
Inter-Channel Redundancy
Sinusoidal
42. 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
Bit Rate
Spectrum Multiplication
Tascam Digital Interface Format (TDIF)
Coaxial
43. Unit of measurement that is equal to one millionth of a meter
Decoder
Micron
Blu-Ray
Foldover
44. Specific set of instructions for carrying out a data reduction technique that determines how to 'save' binary data information efficiently
A/D Conversion
Attenuation
Algorithm
Spectra
45. Each bit in the bit depth is equal to a _____ increase in dynamic range
6 dB
MONO
Interpolation Filter
Tascam Digital Interface Format (TDIF)
46. Stores only one copy of a stereo signal and assigns it to both channels in order to save 50% of original bandwidth
Attenuation
Inter-Channel Redundancy
Amplitude Accuracy
Micron
47. 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
Nanometer
Fidelity
Buffering
Pulse Code Modulation
48. Overtones that contribute to the timbre of a sound and make up a complex waveform's physical characteristics
Coaxial
Harmonic Content
Jitter
TOSLINK
49. Ratio of magnitude of the analytical signal to the magnitude of the background noise signal
Psychoacoustics
Signal- to- Noise Ratio
Convolution
Sine Wave
50. (Amplitude Based) Amplitude: Voltage; Quantization; Bit Depth; Quantization Intervals; Quantization Noise; [Signal:Quantization Noise Ratio]; Dither; Dynamic Range
Analog
Buffer Size
Optical Cable
Y-Axis Terminology