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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. 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
Motion Pictures Experts Group
Anti-Imaging Filter
X-Axis Terminology
Sampling (Samples)
2. Stores only one copy of a stereo signal and assigns it to both channels in order to save 50% of original bandwidth
Fidelity
D/A Conversion
Interleaved
Inter-Channel Redundancy
3. Twice as many samples as the highest frequency at minimum; Sampling rate totally controls frequency response
DVD-14
Sampling Rule
Compression
Photoreceptor
4. Computer program or device capable of encoding and/or decoding a digital data stream with the end result being a reduced file size
Codec
Logical Format
Sampling (Samples)
Aliasing
5. Waveform of a pure tone showing simple harmonic motion
A/D Conversion
Sine Wave
Pulse Density Modulation
Lightpipe
6. 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
Coaxial
Peak Level
Ethernet
SACD
7. Very selective method of lowering buffer levels by halting different levels of audio processing
Analog
Adaptive Pulse Code Modulation
Low-Latency Monitoring
Fourier Series
8. Decibels Full Scale
dB/FS
Data Packing
dBFS
DVD-Audio
9. 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
Effective Bit Depth
Fourier Series
Interpolation Filter
Morse Code
10. 8.75 GB; DS/SL
Algorithm
Exponent
DVD-10
Coaxial
11. Method used in digital recording and reproduction in which a signal is sampled at various points and the resulting value is translated into binary numbers
Pulse Code Modulation
EtherSound
PCM
Motion Pictures Experts Group
12. The ability of a digital system to perform complex DSP without running into problems with overflow or loss of resolution
Variable Bit Rate
Sony-Philips Digital Interface Format (S/PDIF)
Logical Format
Internal Resolution
13. ADPCM; Pulse code modulation that produces a digital signal with a lower bit rate than standard PCM; Records only the difference between samples
Additive Synthesis...
Pass Band
TOSLINK
Adaptive Pulse Code Modulation
14. Visual graph that shows how loud a sound is at different frequencies
D/A Conversion Signal Flow
A/D Conversion
Floating Point
Sonogram
15. Most significant lossless coding technique in current use; Measure of disorder in which long strings of data are represented by short symbols and uses the shortest symbols to represent the most common repetitive audio data maximizing data reduction
Entropy Coding
Fidelity
Frequency
Oversampling
16. A frequency specified for a filter (digital or electronic) the marks the point at which the frequency content of a signal is altered +/- 3dB
Sawtooth Wave
Cutoff Frequency
Latency
CPU Buffering
17. Perceptual coding technique that uses louder sounds of a similar frequency to decide what information is to be saved during data reduction
Masking Analysis...
Attenuation
Equal Loudness Contour
Interpolation Filter
18. 12.33 GB; DS/ML
Transfer Protocol
Multichannel Audio Digital Interface (MADI)
Blu-Ray
DVD-14
19. Psychoacoustic model of data reduction used for general audio compression that aims to transmit only features perceptible to the human ear; Useful for mastering streaming media
Perceptual Coding
DVD-9
Low-Latency Monitoring
Interpolation Filter
20. The difference in volume between the loudest and quietest sounds of a source
AES3
Equal Loudness Contour
Pulse Width Modulation
Dynamic Range
21. Inner ear component that attaches to the stapes and helps to decrease the amplitude of vibrations; Causes the masking phenomenon
Stapedes Reflex
PCM
Sonogram
Noise Shaping
22. Smallest interval measurable by a scientific instrument; Defined by bit rate (sample rate x bit depth)
Oversampling
Logical Format
Resolution
dBFS
23. 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);
Voltage
Bit Depth Effect on Dynamic Range
Decimation Filter
Subbands
24. 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
dB/SPL
Blu-Ray
Storage Conversion Steps
AoE Formats
25. Softest sound that can be heard by the average human ear (0 dB)
Threshold of Hearing
Sample- and-Hold
Spectra
Multichannel Audio Digital Interface (MADI)
26. Father of modern information theory; Solidified the Nyquist Theory by adding the concept that bits per second (binary representation of audio signals) must be at equal intervals to accurately represent data
Square Wave
Oversampling
Claude Shannon
Amplitude Accuracy
27. Leaving space at beginning and ending of song for data crunching during mastering; Last step in mastering process
Normalizing
SCMS
Significand
Pad Head & Tail
28. 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
Joseph Fourier
Compression
Gain Staging
29. Based on psychoacoustics - these are the basis of frequency analysis for a perceptual codec;
Word Clock
Photoreceptor
Algorithm
Subbands
30. High Pressure - Part of a longitudinal wave where the particles of the medium are close together
Zero-Latency Monitoring
Constant Bit Rate
Compression
Overflow
31. 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
dB/FS
Internal Resolution
DVD-9
RMS Meter
32. AAC (Advanced Audio Coding); MP3; RA; WMA; OGG Vorbis; Dolby Digital/AC-3; DTS; ADPCM
RMS
Recording Levels
Lossy Formats
CobraNet
33. (Amplitude Based) Amplitude: Voltage; Quantization; Bit Depth; Quantization Intervals; Quantization Noise; [Signal:Quantization Noise Ratio]; Dither; Dynamic Range
Y-Axis Terminology
Pass Band
Analog
D/A Conversion Signal Flow
34. Subtract place values from the decimal number and place ones or zeros in the correct places
Index of Reflectivity
Resolution
Micron
Decimal- to-Binary Conversion
35. Each bit in the bit depth is equal to a _____ increase in dynamic range
Sawtooth Wave
Harmonic Content
Digital Signal Processing
6 dB
36. The more bits allocated during quantization - the more accurate the measurement
Ethernet
Joseph Fourier
CobraNet
Bit Depth Effect on Dynamic Range
37. The amount of energy at each wavelength
Sample Rate Effect on Anti-Aliasing
Spectra
Storage Conversion Steps
Blu-Ray
38. 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
Spectra
Perceptual Coding
Gain Staging
39. 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
Oversampling
Pulse Density Modulation
Blu-Ray
A/D Conversion
40. Discrete incremental distinctions made between the value of one sample and the next; Breaks down bit depth into a series of evenly spaced intervals
Digital
DVD-10
Quantization Intervals
Pulse Density Modulation
41. Toshiba developed digital audio interface utilizes fiber optics as a transmission medium.
TOSLINK
Joint Stereo
Compression
Dolby 7.1
42. Rate at which energy is drawn from a source that produces a flow of electricity in a circuit; Expressed in volts
Voltage
Fourier Series
Internal Resolution
DVD-5
43. 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
Stapedes Reflex
Sampling (Samples)
Buffering Locations
44. The process of reducing the space required to store data by efficiently encoding the content.
Compression
Noise Shaping
0 dB FS
EtherSound
45. Electromagnetic receptor that detects the radiation known as visible light
DVD-10
DVD-5
Photoreceptor
DVD-18
46. Branch of psychology concerned with the subjective perception of sound
Speed of Sound
Sample- and-Hold
Psychoacoustics
CPU Buffering
47. Defines the number of sample per second taken from a continuous signal to make a discrete signal; Governs the frequency response of digital audio
Sample Rate
Photoreceptor
Inter-Channel Redundancy
Non -Compressed Audio Data Rate Formula
48. Same as 'aliasing'
Sonogram
Foldover
Compression
Sine Wave
49. 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
Codec
Inter-Channel Redundancy
Requirements for A/D Conversion
Noise Shaping
50. Method of representing an acoustic quantity with a series of binary numbers; Can have only specific individually distinct values
Digital
Claude Shannon
Multichannel Audio Digital Interface (MADI)
Threshold of Pain