Test your basic knowledge |

Digital Audio

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. The frequency above or below which attenuation begins in a filter circuit






2. Softest sound that can be heard by the average human ear (0 dB)






3. 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.






4. Voltage -> Dither -> Anti-Aliasing (Low Pass Filter) -> Sample & Hold Circuit -> Successive Approximation/Quantizer --) 100111010 (PCM Audio File)






5. Visual graph that shows how loud a sound is at different frequencies






6. A method of representing real numbers using a mantissa and an exponent






7. 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






8. Fractional part of a floating- point number; Also called the mantissa; Defines precision






9. The difference in volume between the loudest and quietest sounds of a source






10. 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






11. Splits the input signal and mixes it with an analog copy so that no latency is present






12. 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)






13. Computer program or device capable of encoding and/or decoding a digital data stream with the end result being a reduced file size






14. Pertaining to hearing or sound; Combination of the intensity of air pressure molecules with amplitude






15. Unit of measurement that is equal to one billionth of a meter






16. 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






17. Anytime bit depth is reduced the gap gets bigger so more dithering is required






18. 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






19. 'Capturing' part of digital audio; Never captures a signal perfectly






20. Playback; I/O Connections; CPU (Streaming); Conversion from DAW or Software






21. 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






22. 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






23. 8- in/8- out on one cable; 25- pin D- sub connector






24. Low Pressure; Part in a longitudinal wave where the particles are spread apart






25. Digital and analog processing capability is combined on a single microchip allowing for 1- bit resolution at high sample rates






26. Defines the number of sample per second taken from a continuous signal to make a discrete signal; Governs the frequency response of digital audio






27. 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);






28. Ultra low- latency - 512- channel (on a gigabit network) - less flexible AoE format; Routed like audio cables...not network cables






29. 7.95 GB; SS/DL






30. A sample- by- sample operation on two signals






31. 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






32. Discrete incremental distinctions made between the value of one sample and the next; Breaks down bit depth into a series of evenly spaced intervals






33. 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






34. 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






35. 'Reconstructing' part of digital audio






36. Signal that uses variable voltage to create continuous waves resulting in an inexact transmission






37. Method of representing an acoustic quantity with a series of binary numbers; Can have only specific individually distinct values






38. 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






39. More aggressive lossy data reduction techniques that require further manipulation of the stereo field; Examples are 'Intensity' & 'M-S'






40. 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






41. Circuit that interprets the meaning of the symbols as they were chosen and arranged by the encode






42. Describes various optical disc characteristics including the size and shape of the disc - the size of pits - the speed at which the disc spins - and a multitude of aspects regarding the specifications of the player itself






43. (AES/EBU); 110O - 2- channel balanced digital audio cable with an XLR connection; NOT a mic cable!!






44. 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






45. When recording you want the smallest buffer available; When mixing you want the largest buffer available






46. CBR; Codecs encodes data at a constant rate regardless of density of the audio file






47. The ability of a digital system to perform complex DSP without running into problems with overflow or loss of resolution






48. (Amplitude Based) Amplitude: Voltage; Quantization; Bit Depth; Quantization Intervals; Quantization Noise; [Signal:Quantization Noise Ratio]; Dither; Dynamic Range






49. A digital filter's time domain output sequence when the input is a single sample is input






50. French mathematician that noted that any complex sound can be broken down into a series of component pure tones






Can you answer 50 questions in 15 minutes?



Let me suggest you:

Browse all subjects

Browse all tests

Most popular tests



Major Subjects

Tests & Exams


AP
CLEP
DSST
GRE
SAT
GMAT

Browse all subjects

Browse all tests

Most popular tests