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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. Each bit in the bit depth is equal to a _____ increase in dynamic range
6 dB
dB/FS
AES3
Joint Stereo
2. Sony and Philips optical disc format; Utilizes sigma delta DSD to offer higher resolution; 1- bit; 2.8224 MHz; 6-Channel
Joseph Fourier
SACD
Requirements for CD Audio
Sampling Theorem
3. Twice as many samples as the highest frequency at minimum; Sampling rate totally controls frequency response
Bit Depth Effect on Dynamic Range
Sine Wave
Sampling Rule
Conversion Buffering
4. Number of bits per second processed when sampling sound; (Sampling Rate x Bit Depth) = Resolution
Bit Depth
Bit Rate
Decimal- to-Binary Conversion
Dynamic Range
5. 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
Buffer Size
Storage Conversion Steps
Blu-Ray
Sampling (Samples)
6. (AES/EBU); 110O - 2- channel balanced digital audio cable with an XLR connection; NOT a mic cable!!
Sawtooth Wave
Footroom
Cutoff Frequency
AES3
7. 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
Attenuation
Lossy
Aliasing
Signal- to- Noise Ratio
8. Signal conversions are mixed with playback tracks resulting in near-zero latency
Dolby 7.1
Direct Monitoring
Y-Axis Terminology
Joint Stereo
9. Uses entropy coding as the basis; Computer data compression algorithm that packages files such as .ZIP & .RAR
Dithering
Exponent
Amplitude Accuracy
Data Packing
10. Found that aliasing was always a problem no matter how fast you sample; Less data recorded but more accurate; 2 samples per wave length.
Index of Reflectivity
Exponent
Harry Nyquist
Resolution
11. Sony sigma- delta modulation based technology that bypasses the decimation and interpolation steps found in PCM converters
X-Axis Terminology
Sampling Rule
Direct Stream Digital
Acoustics
12. Sum of all harmonics; Sum of sine and cosine waves which have frequencies f - 2f - 3f - 4f...
Joseph Fourier
Significand
Fourier Series
Decimation Filter
13. Apple Lossless; Windows Media Lossless; DTS HD Master Audio; Dolby True HD; FLAC
Data Packing
Lossless Formats
Dolby 5.1
Compression
14. Splits the input signal and mixes it with an analog copy so that no latency is present
Zero-Latency Monitoring
X-Axis Terminology
RMS
Photoreceptor
15. Measure of sound pressure over the frequency spectrum - for which a listener perceives a constant loudness when presented with pure steady tones
Zero-Latency Monitoring
Equal Loudness Contour
Intensity
DVD-10
16. 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
Morse Code
Quantization Error
Buffering Locations
AoE Formats
17. 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
Frequency
Lossy
Resolution
Sample Rate Effect on Anti-Aliasing
18. CobraNet; EtherSound; Dante; AVB (currently under development)
AoE Formats
Sony-Philips Digital Interface Format (S/PDIF)
Digital
RMS
19. ADAT Optcal; 8- in/8- out on two cables; Fiber- optic - TOSLINK connector
Fletcher- Munson Curve
D/A Conversion Signal Flow
Lightpipe
Conversion Buffering
20. Visual graph that shows how loud a sound is at different frequencies
Sonogram
Psychoacoustics
Decimation Filter
Nanometer
21. Difference in brightness between land and pit on a CD Physical Format
Digital Signal Processing
Index of Reflectivity
Floating Point
Physical Disc Format
22. The set of rules that computers use to move files from one computer to another on an internet
Class - D Amplifier
Nanometer
Transfer Protocol
Average Bit Rate
23. Industry Standards: -6 dB Peak = -20 RMS Meter
Sampling Theorem
DVD-10
Headroom Bits
Recording Levels
24. Stores only one copy of a stereo signal and assigns it to both channels in order to save 50% of original bandwidth
Interpolation Filter
Buffering
Inter-Channel Redundancy
Footroom
25. 8.75 GB; DS/SL
Threshold of Pain
Morse Code
MONO
DVD-10
26. The act of a frequency swinging back and forth with a steady - uninterrupted rhythm
Oscillation
Interpolation Filter
Lossy
Coaxial
27. 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.
dB/FS
Effective Bit Depth
Aliasing
Oversampling
28. Smallest interval measurable by a scientific instrument; Defined by bit rate (sample rate x bit depth)
Resolution
Buffering
Conversion Buffering
Non -Compressed Audio Data Rate Formula
29. The number of compressions or rarefactions in one second; The higher the frequency the more compressions & rarefactions per second; Measured in Hertz
Effective Bit Depth
Frequency
Zero-Latency Monitoring
Variable Bit Rate
30. Digital Word -> Series of Resistors (each with assigned charges) -> Sample- and-Hold Circuit -> Anti-Imaging Filter (Smoothing Filter) -> Reconstructed Sample
D/A Conversion Signal Flow
Additive Synthesis...
Quantization
Harmonic Content
31. Accuracy with which an electronic system reproduces the sound or image of its input signal
Fidelity
Compression
Word Clock
Pulse Code Modulation
32. Low Pressure; Part in a longitudinal wave where the particles are spread apart
Glass Master
Rarefaction
Overflow
D/A Conversion Signal Flow
33. Overtones that contribute to the timbre of a sound and make up a complex waveform's physical characteristics
MONO
Harmonic Content
Algorithm
Cutoff Frequency
34. Subtract place values from the decimal number and place ones or zeros in the correct places
Decimal- to-Binary Conversion
European Broadcasting Union
Joint Stereo
Peak Level
35. 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-18
Pulse Density Modulation
Spectra
Dynamic Range
36. Decibels Full Scale
DVD-18
dBFS
Frequency
SACD
37. HD Audio format; Lossless Compression; 24- bit/96 kHz; 5.1 Surround or 24- bit / 192 kHz stereo sound
Normalizing
DVD-Audio
Red Book
Spectrum Multiplication
38. 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
Square Wave
Tascam Digital Interface Format (TDIF)
Exponent
Class - D Amplifier
39. The difference in volume between the loudest and quietest sounds of a source
Acoustics
Delta-Sigma Modulation
Dynamic Range
Square Wave
40. Full Scale; Type of metering that measures level in digital recording system; Recording and Mixing levels should NEVER exceed 0dB FS in digital audio or clipping will occur
Fidelity
Cutoff Frequency
Codec
dB/FS
41. The loudest point of a Full Scale system
Quantization
Claude Shannon
Sample Rate Effect on Anti-Aliasing
0 dB FS
42. 12.33 GB; DS/ML
Normalizing
Anti-Aliasing Filter
Analog
DVD-14
43. 16-Bit; 44.1 kHz; PCM; Stereo
Requirements for CD Audio
Transfer Protocol
Perceptual Coding
Resolution
44. Data transmission protocol over which computer network traffic travels; Poorly suited to real- time transmission but numerous attempts have been made to harness the technology because of its flexible routing; Uses simple Cat5 cabling; Resists interfe
Nanometer
Direct Stream Digital
Audio over Ethernet (AoE)
Noise Shaping
45. Waveform of a pure tone showing simple harmonic motion
Physical Disc Format
I/O Connection Buffering
Motion Pictures Experts Group
Sine Wave
46. Measure of the amplitude of a longitudinal wave
Overflow
Normalizing
Intensity
dB/SPL
47. Mixing data and control characters in a single operation
SACD
Sample Rate Effect on Anti-Aliasing
Oversampling
Interleaved
48. Playback; I/O Connections; CPU (Streaming); Conversion from DAW or Software
EtherSound
Buffering Locations
Pulse Density Modulation
PCM
49. Used when the reference pressure of a sound is 20 microPa (0.00002); Sound Pressure Level; Measure of amplitude
Frames
Low-Latency Monitoring
Dolby 5.1
dB/SPL
50. 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'
Headroom Bits
Harmonic Content
Latency
Intensity