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






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






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






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






5. 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






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






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






8. Method of sampling data at a higher resolution (higher sample rate) as a means of reducing harmonic content during D/A conversion; (x2) oversampling gets rid of all odd harmonic content






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






10. 12.33 GB; DS/ML






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






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






13. 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






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






15. Describes various optical disc characteristics including the size and shape of the disc - the size of pits - the speed at which the disc spins - and a multitude of aspects regarding the specifications of the player itself






16. Decibels Full Scale






17. Father of modern information theory; Solidified the Nyquist Theory by adding the concept that bits per second (binary representation of audio signals) must be at equal intervals to accurately represent data






18. 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






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






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






21. Sample Rate x Bit Depth x # of Channels






22. Increases or decreases the digital signal so that the loudest sample is brought up to 0dBfs; Uses all bits from dynamic range and makes it even from track to track






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






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






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






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






27. Eight channel digital surround sound system by Dolby






28. 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);






29. VBR; Most common & best data reduction technique; Codecs that encode data by determining how dense or sparse areas of the audio are; Can result in buffering issues






30. 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






31. Same as 'aliasing'






32. 12cm plastic disc; 1.2mm thick; One- sided; Red Laser; 1.6 microns between tracks; 125 nanometer pits






33. 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






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






35. Have odd numbered harmonics






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






37. 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






38. Subtract place values from the decimal number and place ones or zeros in the correct places






39. A frequency specified for a filter (digital or electronic) the marks the point at which the frequency content of a signal is altered +/- 3dB






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






41. 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'






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






43. Data reduction technique that selectively removes original information in order to significantly reduce the file size; Some data is lost; Files can be reduced up to 99% in size (90% with no perceived sound quality loss); Bit rate effects the perceive






44. 8- in/8- out on one cable; 25- pin D- sub connector






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






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






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






48. 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






49. 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






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