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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. Circuit that interprets the meaning of the symbols as they were chosen and arranged by the encode
SCMS
Quantization Intervals
Sawtooth Wave
Decoder
2. Apple Lossless; Windows Media Lossless; DTS HD Master Audio; Dolby True HD; FLAC
Lossless Formats
Masking Analysis...
SACD
Pad Head & Tail
3. As sample rate is increased more room is created for a smoother slope of the attenuation band because Nyquist limit extends well beyond range of hearing with each increase
Effective Bit Depth
Threshold of Pain
Sample Rate Effect on Anti-Aliasing
Nyquist Frequency
4. Accuracy with which an electronic system reproduces the sound or image of its input signal
Significand
Audio Engineering Society
Successive Approximation
Fidelity
5. Measure of sound pressure over the frequency spectrum - for which a listener perceives a constant loudness when presented with pure steady tones
Nanometer
PCM
Sample Rate Effect on Anti-Aliasing
Equal Loudness Contour
6. The ability of a digital system to perform complex DSP without running into problems with overflow or loss of resolution
Threshold of Hearing
AoE Formats
Oversampling
Internal Resolution
7. Multi-Bit Words; (Pulse Code Modulation)
Acoustics
PCM
Tascam Digital Interface Format (TDIF)
Transfer Protocol
8. Measuring equipment in A/D conversion that processes voltage and provides a value for that voltage
Quantizer
I/O Connection Buffering
Redither
Delta-Sigma Modulation
9. MPEG; Standardizing body of audio coding
Spectra
Redither
Lossy
Motion Pictures Experts Group
10. 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
Spectrum Multiplication
Sine Wave
Sampling Theorem
11. Measure of the amplitude of a longitudinal wave
Base 2 System
Intensity
Sampling Theorem
Adaptive Pulse Code Modulation
12. Found that aliasing was always a problem no matter how fast you sample; Less data recorded but more accurate; 2 samples per wave length.
Harry Nyquist
Pass Band
Storage Conversion Steps
Additive Synthesis...
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
Interleaved
Speed of Sound
Index of Reflectivity
Quantization Error
14. AAC (Advanced Audio Coding); MP3; RA; WMA; OGG Vorbis; Dolby Digital/AC-3; DTS; ADPCM
Square Wave
Lossy Formats
dB/SPL
6 dB
15. Difference in brightness between land and pit on a CD Physical Format
Dynamic Range
Index of Reflectivity
Psychoacoustics
Spectra
16. Splits the input signal and mixes it with an analog copy so that no latency is present
Fidelity
Zero-Latency Monitoring
Ethernet
Equal Loudness Contour
17. Ratio of magnitude of the analytical signal to the magnitude of the background noise signal
Oversampling
Footroom
Joseph Fourier
Signal- to- Noise Ratio
18. Stores only one copy of a stereo signal and assigns it to both channels in order to save 50% of original bandwidth
Micron
Inter-Channel Redundancy
Sinusoidal
Buffering
19. High channel count; 64 channels on one cable; Coaxial cable with BNC connector or fiber optic with ST1 connector
Intensity Stereo
M-S Stereo
Successive Approximation
Multichannel Audio Digital Interface (MADI)
20. AES
Lightpipe
Coaxial
Lossy
Audio Engineering Society
21. Ultra low- latency - 512- channel (on a gigabit network) - less flexible AoE format; Routed like audio cables...not network cables
SACD
Playback Buffering
EtherSound
Threshold of Pain
22. Rate at which energy is drawn from a source that produces a flow of electricity in a circuit; Expressed in volts
Voltage
Equal Loudness Contour
AoE Formats
Dynamic Range
23. 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
Oversampling
Interpolation Filter
Digital Signal Processing
dBFS
24. Voltage -> Dither -> Anti-Aliasing (Low Pass Filter) -> Sample & Hold Circuit -> Successive Approximation/Quantizer --) 100111010 (PCM Audio File)
Decimation Filter
A/D Conversion Signal Flow
Decoder
Harmonic Content
25. 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)
Index of Reflectivity
Fletcher- Munson Curve
Nanometer
Entropy Coding
26. Discrete incremental distinctions made between the value of one sample and the next; Breaks down bit depth into a series of evenly spaced intervals
Intensity
Quantization Intervals
2 Dimensions of Sound
Lossless
27. Electromagnetic receptor that detects the radiation known as visible light
Cutoff Frequency
Photoreceptor
Sawtooth Wave
Dithering
28. Serial Copy Management System; main difference between AES3 & S/PIDF
SCMS
Sony-Philips Digital Interface Format (S/PDIF)
Floating Point
Redither
29. 12cm plastic disc; 1.2mm thick; One- sided; Red Laser; 1.6 microns between tracks; 125 nanometer pits
Quantization Intervals
Red Book
Quantizer
Decimal- to-Binary Conversion
30. 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
Pulse Density Modulation
Physical Disc Format
DVD-18
Anti-Imaging Filter
31. A method of representing real numbers using a mantissa and an exponent
Floating Point
A/D Conversion
Lossless Formats
Bit Depth
32. Data reduction technique that does not effect quality of original audio; No effect on original quality; Typically around 50% reduction; Exact reconstruction of digital code for the audio signal
Cutoff Frequency
Multichannel Audio Digital Interface (MADI)
Decoder
Lossless
33. The frequency range that is allowed through a filter
Pass Band
SCMS
Interleaved
Word Clock
34. The more bits allocated during quantization - the more accurate the measurement
Sinusoidal
Entropy Coding
Quantization
Bit Depth Effect on Dynamic Range
35. Sony sigma- delta modulation based technology that bypasses the decimation and interpolation steps found in PCM converters
Overflow
DVD-5
Direct Stream Digital
Impulse Response
36. In order to play multiple channels at one time data is buffered as read to disk; Latency happens between play command & beginning of playback
Playback Buffering
Signal- to- Noise Ratio
Internal Resolution
Quantization Intervals
37. 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
DVD-14
Anti-Aliasing Filter
Average Bit Rate
Ethernet
38. Six channel (five speakers and one subwoofer for bass) digital surround sound system by Dolby
Dolby 5.1
Headroom Bits
Tascam Digital Interface Format (TDIF)
Sample- and-Hold
39. Perceptual coding technique that uses louder sounds of a similar frequency to decide what information is to be saved during data reduction
Masking Analysis...
CobraNet
Intensity
Buffering Locations
40. 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
dB/FS
Glass Master
Multichannel Audio Digital Interface (MADI)
Quantization Error
41. The amount of energy at each wavelength
Harmonic Content
Dynamic Range
Spectra
Gain Staging
42. HD Audio format; Lossless Compression; 24- bit/96 kHz; 5.1 Surround or 24- bit / 192 kHz stereo sound
Frames
DVD-Audio
Oversampling
Inter-Channel Redundancy
43. Process that begins with a fast FFT analysis of the spectra of two input signals - then the multiplication of like frequencies - and IFFT to finalize the process
Sample Rate Effect on Anti-Aliasing
Anti-Aliasing Filter
A/D Conversion Signal Flow
Spectrum Multiplication
44. Snippets of time in which frequency analysis takes place in a perceptual codec
Harmonic Content
Frames
Cutoff Frequency
Oscillation
45. The continuous loss of signal strengths as a signal travels through a medium
X-Axis Terminology
Attenuation
Cutoff Frequency
Sinusoidal
46. (Time Based) Frequency: Aliasing; Anti-Aliasing Filter; Sample Rate; Nyquist Limit
Fourier Series
X-Axis Terminology
Psychoacoustics
Attenuation
47. Measurement at regular intervals of the amplitude of a varying waveform (in order to convert it to digital form); There must be a minimum of 2 samples for each cycle in a waveform
Sample- and-Hold
DVD-9
Signal- to- Noise Ratio
Sampling (Samples)
48. ADAT Optcal; 8- in/8- out on two cables; Fiber- optic - TOSLINK connector
Intensity
Lightpipe
TOSLINK
Latency
49. Level above which audible sounds are painful (125 - 130 db)
SCMS
Threshold of Pain
Direct Stream Digital
Ethernet
50. Describes acceptable data - performances both offered and essential for a disc player - and the complete user experience
Nanometer
Foldover
Overflow
Logical Format