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. Six channel (five speakers and one subwoofer for bass) digital surround sound system by Dolby






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






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






4. The continuous loss of signal strengths as a signal travels through a medium






5. ABR; Codecs that encode data by determining how dense or sparse areas of the audio are while also keeping bit rate within specified limits to avoid rebuffering






6. The set of rules that computers use to move files from one computer to another on an internet






7. The art of deciding where to place a processor in signal flow based on how that processor will be influenced by the other processors in the path






8. Serial Copy Management System; main difference between AES3 & S/PIDF






9. Inner ear component that attaches to the stapes and helps to decrease the amplitude of vibrations; Causes the masking phenomenon






10. Overtones that contribute to the timbre of a sound and make up a complex waveform's physical characteristics






11. Subtract place values from the decimal number and place ones or zeros in the correct places






12. 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






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






14. Digital (binary) measurements of how long each pulse is either on or off; Width of increasing voltage or decreasing voltage is assigned a 1 or 0 respectively






15. Take up half as many bits (50%); Algorithm can keep same quality by lossing the stereo track






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






17. Measure of the amplitude of a longitudinal wave






18. Toshiba developed digital audio interface utilizes fiber optics as a transmission medium.






19. A frequency specified for a filter (digital or electronic) the marks the point at which the frequency content of a signal is altered +/- 3dB






20. Number or variable that represents the number of times the base of a power is used as a factor; Defines magnitude






21. 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






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






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






24. 16-Bit; 44.1 kHz; PCM; Stereo






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






26. 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






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






28. Mixing data and control characters in a single operation






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






30. Digital Word -> Series of Resistors (each with assigned charges) -> Sample- and-Hold Circuit -> Anti-Imaging Filter (Smoothing Filter) -> Reconstructed Sample






31. EBU






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






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






34. Sony and Philips optical disc format; Utilizes sigma delta DSD to offer higher resolution; 1- bit; 2.8224 MHz; 6-Channel






35. Uses entropy coding as the basis; Computer data compression algorithm that packages files such as .ZIP & .RAR






36. Occurs as data is assembled into meaningful bits or information and as left & right channels are separated






37. Contains all even and odd harmonics associated with a fundamental tone - making it a rich source for modeling other sounds; Amplitude of each overtone decreases exponentially as a ratio of the harmonic's frequency to that of the fundamental






38. Difference in brightness between land and pit on a CD Physical Format






39. 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






40. How Loud (Y-Axis) & How Fast (X-Axis)






41. Branch of psychology concerned with the subjective perception of sound






42. 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






43. Level above which audible sounds are painful (125 - 130 db)






44. Twice as many samples as the highest frequency at minimum; Sampling rate totally controls frequency response






45. Number of bits per second processed when sampling sound; (Sampling Rate x Bit Depth) = Resolution






46. Algorithm uses matrix of a mid/side microphone pair to determine a side signal & that signal is reduced then distributed as code in stereo






47. 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);






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






49. 12cm plastic disc; 1.2mm thick; One- sided; Red Laser; 1.6 microns between tracks; 125 nanometer pits






50. 4.38 GB; SS/SL