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






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






3. A time regulator that makes all samples and bits to align when working with interconnected digital devices; Basically a signal that all of the digital devices refer to when operating.






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






5. 1st commercially successful AoE format for the transmission of digital audio - video - and control signals over 64- channel 100Mbps Ethernet networks






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






7. The loudest point of a Full Scale system






8. 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






9. 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






10. A situation where a calculated value cannot fit into the number of digits reserved for it






11. AES






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






13. Eight channel digital surround sound system by Dolby






14. Ultra low- latency - 512- channel (on a gigabit network) - less flexible AoE format; Routed like audio cables...not network cables






15. Only 2 digits used; The value of each place (ones - hundreds - etc.) are as follows from greatest to least: 128 - 64 - 32 - 16 - 8 - 4 - 2 - 1






16. French mathematician that noted that any complex sound can be broken down into a series of component pure tones






17. 16-Bit; 44.1 kHz; PCM; Stereo






18. 12cm plastic disc; 1.2mm thick; One- sided; Red Laser; 1.6 microns between tracks; 125 nanometer pits






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






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






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






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






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






24. 'Capturing' part of digital audio; Never captures a signal perfectly






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






26. Same as 'aliasing'






27. Roughly around 1 -130 ft/s






28. 12.33 GB; DS/ML






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






30. 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






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






32. 8- in/8- out on one cable; 25- pin D- sub connector






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






34. 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






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






36. 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






37. A digital filter's time domain output sequence when the input is a single sample is input






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






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






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






41. Mixing data and control characters in a single operation






42. ABR; Codecs that encode data by determining how dense or sparse areas of the audio are while also keeping bit rate within specified limits to avoid rebuffering






43. 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






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






45. 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






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






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






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






49. Anytime bit depth is reduced the gap gets bigger so more dithering is required






50. Based on psychoacoustics - these are the basis of frequency analysis for a perceptual codec;