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. Governs the frequency response of a digital system; The highest- frequency component that can be captured with a sampling rate; always 1/2 of sampling rate; Also called the limiting frequency






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






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






4. 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






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






6. A sample- by- sample operation on two signals






7. Number of bits used to represent the smallest unit of information in an audio file; Greater bit depth = better quality audio






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






9. CobraNet; EtherSound; Dante; AVB (currently under development)






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






11. 12.33 GB; DS/ML






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






13. Unit of measurement that is equal to one millionth of a meter






14. A drive that can read and write on optical media that hold up to 50 GB on two layers; 24- bit/96 kHz for 8-Channel; 24- bit/192 kHz for 6-Channel






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






16. Waveform of a pure tone showing simple harmonic motion






17. As sample rate is increased more room is created for a smoother slope of the attenuation band because Nyquist limit extends well beyond range of hearing with each increase






18. The amount of energy at each wavelength






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






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






21. 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);






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






23. Same as 'aliasing'






24. 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






25. MPEG; Standardizing body of audio coding






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






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






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






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






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






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






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






33. 4.38 GB; SS/SL






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






35. 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)






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






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






38. High Pressure - Part of a longitudinal wave where the particles of the medium are close together






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






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






41. 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






42. 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






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






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






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






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






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






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






49. The loudest point of a Full Scale system






50. 8- in/8- out on one cable; 25- pin D- sub connector