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. Decibels Full Scale






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






3. 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






4. 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






5. 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






6. 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






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






8. 12.33 GB; DS/ML






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






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






11. 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






12. Method of representing an acoustic quantity with a series of binary numbers; Can have only specific individually distinct values






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






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






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






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






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






19. Have odd numbered harmonics






20. 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






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






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






23. Same as 'aliasing'






24. 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






25. 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






26. The loudest point of a Full Scale system






27. 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






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






29. Waveform of a pure tone showing simple harmonic motion






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






31. How Loud (Y-Axis) & How Fast (X-Axis)






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






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






34. Signal that uses variable voltage to create continuous waves resulting in an inexact transmission






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






36. The frequency range that is allowed through a filter






37. The amount of energy at each wavelength






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






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






40. 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






41. 12cm plastic disc; 1.2mm thick; One- sided; Red Laser; 1.6 microns between tracks; 125 nanometer pits






42. Removes high frequency images and noise and smoothes the stair case output coming from of the sample and hold circuit; Also called a SMOOTHING FILTER






43. The number of compressions or rarefactions in one second; The higher the frequency the more compressions & rarefactions per second; Measured in Hertz






44. HD Audio format; Lossless Compression; 24- bit/96 kHz; 5.1 Surround or 24- bit / 192 kHz stereo sound






45. 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






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






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






48. Number or variable that represents the number of times the base of a power is used as a factor; Defines magnitude






49. Six channel (five speakers and one subwoofer for bass) digital surround sound system by Dolby






50. 4.38 GB; SS/SL