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. 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






2. 12cm plastic disc; 1.2mm thick; One- sided; Red Laser; 1.6 microns between tracks; 125 nanometer pits






3. The difference between the analog value and the approximated digital value due to the 'rounding' that occurs while converting the analog signal to digital






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






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






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






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






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






9. 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






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






11. The amount of energy at each wavelength






12. The frequency range that is allowed through a filter






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






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






15. Electromagnetic receptor that detects the radiation known as visible light






16. Have odd numbered harmonics






17. 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






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






19. Decibels Full Scale






20. Mixing data and control characters in a single operation






21. Stores only one copy of a stereo signal and assigns it to both channels in order to save 50% of original bandwidth






22. 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






23. 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






24. In order to play multiple channels at one time data is buffered as read to disk; Latency happens between play command & beginning of playback






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






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






27. Single- pin RCA cable or fiber- optic TOSLINK connector used for digital transfer; 75O coaxial - 2- channel unbalanced; 'Consumer' format of AES3






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






29. HD Audio format; Lossless Compression; 24- bit/96 kHz; 5.1 Surround or 24- bit / 192 kHz stereo sound






30. 'Reconstructing' part of digital audio






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






32. Eliminates frequencies above the Nyquist limit from becoming samples; Occurs prior to quantization






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






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






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






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






37. 8.75 GB; DS/SL






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






39. 8- in/8- out on one cable; 25- pin D- sub connector






40. 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






41. Signal conversions are mixed with playback tracks resulting in near-zero latency






42. 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






43. 16-Bit; 44.1 kHz; PCM; Stereo






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






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






46. Measuring equipment in A/D conversion that processes voltage and provides a value for that voltage






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






48. Measures the highest levels of a signal being recorded or mixed; Monitors for clipping - which occurs at 0dBFS); Does not always reflect perceived volume of signal






49. 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






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