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. The mathematics - algorithms - and the techniques used to manipulate signals after they have been converted to digital form






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






3. Accuracy with which an electronic system reproduces the sound or image of its input signal






4. The frequency range that is allowed through a filter






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






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






7. Joint-Stereo Technique; Since the human brain is unable to localize sounds at high frequencies well sounds above 9 kHz threshold are encoded in mono






8. 1st commercially successful AoE format for the transmission of digital audio - video - and control signals over 64- channel 100Mbps Ethernet networks






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






10. ADAT Optcal; 8- in/8- out on two cables; Fiber- optic - TOSLINK connector






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






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






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






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






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






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






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






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






19. Contains all even and odd harmonics associated with a fundamental tone - making it a rich source for modeling other sounds; Amplitude of each overtone decreases exponentially as a ratio of the harmonic's frequency to that of the fundamental






20. 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






21. 12cm plastic disc; 1.2mm thick; One- sided; Red Laser; 1.6 microns between tracks; 125 nanometer pits






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






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






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






25. 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






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






27. 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






28. The process of reducing the space required to store data by efficiently encoding the content.






29. Reference voltage determined by summing the voltage values of a predetermined number of previous samples; Numbers of 1 in row = waveform peak; Numbers of 0 in row = waveform trough; Basis of Sony's Direct Stream Digital (DSD)






30. Method used in digital recording and reproduction in which a signal is sampled at various points and the resulting value is translated into binary numbers






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






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






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






34. Signal voltage is relayed to a register from sample- and - hold circuit; Holds reference frequencies in binary form that decrease in value; Finds approximated value & assigns binary number accordingly






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






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






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






38. 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.






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






40. Overtones that contribute to the timbre of a sound and make up a complex waveform's physical characteristics






41. Each bit in the bit depth is equal to a _____ increase in dynamic range






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






43. Fractional part of a floating- point number; Also called the mantissa; Defines precision






44. Sample Rate x Bit Depth x # of Channels






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






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






47. 8- in/8- out on one cable; 25- pin D- sub connector






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






49. Deviation from a normal - steady pulse or tick of a clock that contributes to misrepresentation of a signal; Result of small timing irregularities that become magnified during the transmission of digital signals as the signals are passed from one dev






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