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. 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






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






3. Rate at which energy is drawn from a source that produces a flow of electricity in a circuit; Expressed in volts






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






5. 12cm plastic disc; 1.2mm thick; One- sided; Red Laser; 1.6 microns between tracks; 125 nanometer pits






6. 15.9 GB; DS/DL






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






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






9. ADAT Optcal; 8- in/8- out on two cables; Fiber- optic - TOSLINK connector






10. Used when the reference pressure of a sound is 20 microPa (0.00002); Sound Pressure Level; Measure of amplitude






11. 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






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






13. Accuracy with which an electronic system reproduces the sound or image of its input signal






14. 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'






15. A time regulator that makes all samples and bits to align when working with interconnected digital devices; Basically a signal that all of the digital devices refer to when operating.






16. Industry Standards: -6 dB Peak = -20 RMS Meter






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






18. The loudest point of a Full Scale system






19. Based on psychoacoustics - these are the basis of frequency analysis for a perceptual codec;






20. Leaving space at beginning and ending of song for data crunching during mastering; Last step in mastering process






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






22. Lossless Format; Can hold up to 25GB on a single- layer disc and 50GB on a dual- layer disc






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






24. Sample Rate x Bit Depth x # of Channels






25. 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






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






27. Smallest interval measurable by a scientific instrument; Defined by bit rate (sample rate x bit depth)






28. 12.33 GB; DS/ML






29. More accuracy in low amplitudes and less in higher amplitudes






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






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






32. The amount of energy at each wavelength






33. AES






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






35. Circuit that seizes voltage values with each tick of an A/D device's internal clock






36. Represents the amplitude component of the digital sampling process; Technique of incrementing a continuous analog event into a discrete set of binary digits (bits)






37. 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






38. 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






39. Sum of all harmonics; Sum of sine and cosine waves which have frequencies f - 2f - 3f - 4f...






40. If a signal is sampled at a rate higher than twice the highest significant signal frequency and at evenly spaced intervals - then the samples contain all the information of the original signal






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






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






43. Same as 'aliasing'






44. The mathematics - algorithms - and the techniques used to manipulate signals after they have been converted to digital form






45. Perceptual coding technique that uses louder sounds of a similar frequency to decide what information is to be saved during data reduction






46. 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






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






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






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






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