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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. More aggressive lossy data reduction techniques that require further manipulation of the stereo field; Examples are 'Intensity' & 'M-S'
Cutoff Frequency
RMS
Joint Stereo
Perceptual Coding
2. Uses entropy coding as the basis; Computer data compression algorithm that packages files such as .ZIP & .RAR
Impulse Response
Data Packing
Sampling Theorem
Requirements for A/D Conversion
3. Samples are duplicated and the playback sampling rate correspondingly increased; Significantly raises the Nyquist limit to a range well beyond human hearing; Processing 'pushes' the distortion resulting from quantization error into these higher frequ
Sampling (Samples)
Sonogram
Noise Shaping
Joseph Fourier
4. Branch of psychology concerned with the subjective perception of sound
Interleaved
Pass Band
Psychoacoustics
Fletcher- Munson Curve
5. When recording you want the smallest buffer available; When mixing you want the largest buffer available
Sampling Theorem
dB/SPL
Buffer Size
Pad Head & Tail
6. DAW's and software must buffer when converting or bouncing and this latency can add up if not monitored
Foldover
DVD-18
Conversion Buffering
Joseph Fourier
7. 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
Playback Buffering
Compression
Class - D Amplifier
Jitter
8. The continuous loss of signal strengths as a signal travels through a medium
Attenuation
Low-Latency Monitoring
Audio over Ethernet (AoE)
European Broadcasting Union
9. Level above which audible sounds are painful (125 - 130 db)
Fidelity
Word Clock
Zero-Latency Monitoring
Threshold of Pain
10. Serial Copy Management System; main difference between AES3 & S/PIDF
SCMS
Cutoff Frequency
Digital Signal Processing
CobraNet
11. More accuracy in low amplitudes and less in higher amplitudes
Ethernet
Digital Signal Processing
Amplitude Accuracy
Entropy Coding
12. Measuring equipment in A/D conversion that processes voltage and provides a value for that voltage
Threshold of Pain
A/D Conversion
Quantizer
Spectra
13. 8.75 GB; DS/SL
CPU Buffering
Decimation Filter
Aliasing
DVD-10
14. 7.95 GB; SS/DL
M-S Stereo
Joseph Fourier
DVD-9
RMS Meter
15. 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
Base 2 System
Lossy
Compression
Sampling Rule
16. Snippets of time in which frequency analysis takes place in a perceptual codec
Nyquist Frequency
SCMS
Interpolation Filter
Frames
17. ADAT Optcal; 8- in/8- out on two cables; Fiber- optic - TOSLINK connector
Lightpipe
Spectra
Pulse Density Modulation
Playback Buffering
18. Splits the input signal and mixes it with an analog copy so that no latency is present
Zero-Latency Monitoring
Y-Axis Terminology
Buffer Size
Digital Signal Processing
19. AES
Audio Engineering Society
AoE Formats
Adaptive Pulse Code Modulation
Stapedes Reflex
20. 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.
Aliasing
CobraNet
Cutoff Frequency
X-Axis Terminology
21. Joint-Stereo Technique; Since the human brain is unable to localize sounds at high frequencies well sounds above 9 kHz threshold are encoded in mono
Pulse Density Modulation
SACD
Intensity Stereo
Recording Levels
22. Waveform of a pure tone showing simple harmonic motion
Decimation Filter
Sine Wave
Quantization Error
Headroom Bits
23. 12.33 GB; DS/ML
Fidelity
Pass Band
DVD-14
Sawtooth Wave
24. Apple Lossless; Windows Media Lossless; DTS HD Master Audio; Dolby True HD; FLAC
Lossless Formats
Morse Code
DVD-14
Redither
25. Discrete incremental distinctions made between the value of one sample and the next; Breaks down bit depth into a series of evenly spaced intervals
dB/FS
Quantization Intervals
European Broadcasting Union
Resolution
26. Method of sampling data at a higher resolution (higher sample rate) as a means of reducing harmonic content during D/A conversion; (x2) oversampling gets rid of all odd harmonic content
Anti-Imaging Filter
Oversampling
Multichannel Audio Digital Interface (MADI)
Direct Stream Digital
27. 12cm plastic disc; 1.2mm thick; One- sided; Red Laser; 1.6 microns between tracks; 125 nanometer pits
Decoder
Audio Engineering Society
Red Book
Significand
28. Each bit in the bit depth is equal to a _____ increase in dynamic range
CPU Buffering
dB/FS
6 dB
Average Bit Rate
29. 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
Codec
Glass Master
Jitter
Decimation Filter
30. The elapsed time it takes for a packet of data to arrive at its destination; Lagging or pause of an audio signal as digital processing occurs; Can be managed utilizing several forms of 'audio monitoring'
Latency
0 dB FS
Audio over Ethernet (AoE)
Resolution
31. Process of building a complex tone by starting with the fundamental frequency and adding pure tone harmonics
Logical Format
Redither
Anti-Aliasing Filter
Additive Synthesis...
32. Low Pressure; Part in a longitudinal wave where the particles are spread apart
Bit Rate
Rarefaction
Dithering
Recording Levels
33. Found that aliasing was always a problem no matter how fast you sample; Less data recorded but more accurate; 2 samples per wave length.
Square Wave
Bit Depth
Pulse Code Modulation
Harry Nyquist
34. High Pressure - Part of a longitudinal wave where the particles of the medium are close together
Compression
Intensity Stereo
MONO
Anti-Imaging Filter
35. ADPCM; Pulse code modulation that produces a digital signal with a lower bit rate than standard PCM; Records only the difference between samples
Foldover
Signal- to- Noise Ratio
Adaptive Pulse Code Modulation
0 dB FS
36. 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)
DVD-5
Bit Depth Effect on Dynamic Range
Pulse Density Modulation
Joseph Fourier
37. The set of rules that computers use to move files from one computer to another on an internet
Sony-Philips Digital Interface Format (S/PDIF)
RMS Meter
European Broadcasting Union
Transfer Protocol
38. Signal conversions are mixed with playback tracks resulting in near-zero latency
CobraNet
Bit Depth Effect on Dynamic Range
Direct Monitoring
Ethernet
39. Difference in brightness between land and pit on a CD Physical Format
Index of Reflectivity
Sample Rate Effect on Anti-Aliasing
Lightpipe
Dolby 7.1
40. The difference between the analog value and the approximated digital value due to the 'rounding' that occurs while converting the analog signal to digital
Effective Bit Depth
AES3
Quantization Error
MONO
41. Have odd numbered harmonics
Decimation Filter
Harmonic Content
Square Wave
dB/SPL
42. 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
Transfer Protocol
Base 2 System
Psychoacoustics
43. 'Capturing' part of digital audio; Never captures a signal perfectly
A/D Conversion
Audio over Ethernet (AoE)
Recording Levels
Sony-Philips Digital Interface Format (S/PDIF)
44. 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)
Nanometer
Fletcher- Munson Curve
Stapedes Reflex
Jitter
45. 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)
CPU Buffering
Data Packing
Anti-Aliasing Filter
46. Rate at which energy is drawn from a source that produces a flow of electricity in a circuit; Expressed in volts
Sample Rate
Voltage
Sampling Theorem
Internal Resolution
47. 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
Zero-Latency Monitoring
Adaptive Pulse Code Modulation
Joint Stereo
Morse Code
48. Overtones that contribute to the timbre of a sound and make up a complex waveform's physical characteristics
DVD-10
Class - D Amplifier
Sampling (Samples)
Harmonic Content
49. 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
Nyquist Frequency
Lossy
Compression
Interpolation Filter
50. Sum of all harmonics; Sum of sine and cosine waves which have frequencies f - 2f - 3f - 4f...
Quantization Intervals
Spectrum Multiplication
Fourier Series
Footroom