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. 7.95 GB; SS/DL






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






3. The loudest point of a Full Scale system






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






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






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






7. 8.75 GB; DS/SL






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






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






10. Channels are processed one at a time and the results are stored on multiple CPU buffers that alternately send data as DAW requests the data for playback; First few seconds are relayed to the buffer prior to processing and playback and it continuously






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






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






13. Specific set of instructions for carrying out a data reduction technique that determines how to 'save' binary data information efficiently






14. Increases D/A sample rate from nominal rate to oversampling rate by turning series multi- bit PCM samples into 1- bit samples; (ex. => 44.1kHz sample rate converted to 2.8MHz and simultaneously converts multi- bit samples to 1- bit); Low Pass Filter






15. Having a repeated succession of waves or curves as in a sound waveform






16. Allows for an internal sample rate at multiples of the input and output rates; Alleviates the need for steep 'brickwall' filters; Often combined with internal '1- bit' processing; Increases smoothing effect






17. 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)






18. Describes acceptable data - performances both offered and essential for a disc player - and the complete user experience






19. Data is transmitted over fiber optic lines; Uses a TOSLINK connecter instead of an RCA type; Can transmit multi- channel audio; Not susceptible to ground hum and loops; Able to support far higher rates of data transfer over greater distances than coa






20. 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






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






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






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






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






25. 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






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






27. 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






28. 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






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






30. Snippets of time in which frequency analysis takes place in a perceptual codec






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






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






33. 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)






34. Eight channel digital surround sound system by Dolby






35. 15.9 GB; DS/DL






36. The act of a frequency swinging back and forth with a steady - uninterrupted rhythm






37. 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






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






39. Based on Full Scale (dB/FS); -6dB represents a loss of one bit so account for this when calculating






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






41. 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






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






43. 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.






44. Ratio of magnitude of the analytical signal to the magnitude of the background noise signal






45. Decibels Full Scale






46. 12.33 GB; DS/ML






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






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






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






50. Process of building a complex tone by starting with the fundamental frequency and adding pure tone harmonics