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. 1.) Taking a series of evenly- spaced measurements 2.) Signal contains no frequency components higher than half the sample rate






2. The loudest point of a Full Scale system






3. 16-Bit; 44.1 kHz; PCM; Stereo






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






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






6. 15.9 GB; DS/DL






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






8. The more bits allocated during quantization - the more accurate the measurement






9. 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






10. 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






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






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






13. 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






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






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






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






17. 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






18. Apple Lossless; Windows Media Lossless; DTS HD Master Audio; Dolby True HD; FLAC






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






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






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






22. Multi-Bit Words; (Pulse Code Modulation)






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






24. 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'






25. 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






26. High channel count; 64 channels on one cable; Coaxial cable with BNC connector or fiber optic with ST1 connector






27. 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)






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






29. The number of compressions or rarefactions in one second; The higher the frequency the more compressions & rarefactions per second; Measured in Hertz






30. DAW's and software must buffer when converting or bouncing and this latency can add up if not monitored






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






32. 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






33. 12.33 GB; DS/ML






34. Root Mean Square; Refers to taking the square root of all instantaneous amplitudes; Takes the average of those squares; (-6 Peak Level is approximately equal to -20 RMS)






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






36. EDL; Final list of samples used in the audio editing process; Identified by time code






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






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






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






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






41. 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






42. Sample Rate x Bit Depth x # of Channels






43. 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






44. Measure of the amplitude of a longitudinal wave






45. ADPCM; Pulse code modulation that produces a digital signal with a lower bit rate than standard PCM; Records only the difference between samples






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






47. Built into DAWs; Bits are added when signals are mixed together to avoid clipping






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






49. 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






50. 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