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. Unit of measurement that is equal to one billionth of a meter






2. Pertaining to hearing or sound; Combination of the intensity of air pressure molecules with amplitude






3. AES






4. Take up half as many bits (50%); Algorithm can keep same quality by lossing the stereo track






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






6. The ability of a digital system to perform complex DSP without running into problems with overflow or loss of resolution






7. Mixing data and control characters in a single operation






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






9. Waveform of a pure tone showing simple harmonic motion






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






11. 16-Bit; 44.1 kHz; PCM; Stereo






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






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






14. 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






15. 8- in/8- out on one cable; 25- pin D- sub connector






16. AAC (Advanced Audio Coding); MP3; RA; WMA; OGG Vorbis; Dolby Digital/AC-3; DTS; ADPCM






17. 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






18. Samples are duplicated and the playback sampling rate correspondingly increased; Significantly raises the Nyquist limit to a range well beyond human hearing; Processing 'pushes' the distortion resulting from quantization error into these higher frequ






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






20. The frequency above or below which attenuation begins in a filter circuit






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






22. Sample Rate x Bit Depth x # of Channels






23. Rate at which energy is drawn from a source that produces a flow of electricity in a circuit; Expressed in volts






24. Series of dots and dashes representing the letters of the alphabet; Most common letters are represented by the shortest dots and dashes; Example of entropy coding






25. 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






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






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






28. The frequency range that is allowed through a filter






29. 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






30. The loudest point of a Full Scale system






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






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






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






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






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






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






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






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






39. Computer program or device capable of encoding and/or decoding a digital data stream with the end result being a reduced file size






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






41. Allowance of noise floor below that which is required for the final product






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






43. 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






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






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






46. 7.95 GB; SS/DL






47. (Time Based) Frequency: Aliasing; Anti-Aliasing Filter; Sample Rate; Nyquist Limit






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






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






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