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. 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






2. 12cm plastic disc; 1.2mm thick; One- sided; Red Laser; 1.6 microns between tracks; 125 nanometer pits






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






4. 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






5. Twice as many samples as the highest frequency at minimum; Sampling rate totally controls frequency response






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






7. 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






8. Psychoacoustic model of data reduction used for general audio compression that aims to transmit only features perceptible to the human ear; Useful for mastering streaming media






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






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






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






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






13. 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






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






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






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






17. The difference in volume between the loudest and quietest sounds of a source






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






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






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






21. Roughly around 1 -130 ft/s






22. A drive that can read and write on optical media that hold up to 50 GB on two layers; 24- bit/96 kHz for 8-Channel; 24- bit/192 kHz for 6-Channel






23. Reduces the percieved distortion due to quantization error; Low level white noise source is introduced to make the profile of the quantization 'noise' more irregular; Useful when reducing the number of bits per word in a signal (i.e. when converting






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






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






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






27. Same as 'aliasing'






28. Having a repeated succession of waves or curves as in a sound waveform






29. 15.9 GB; DS/DL






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






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






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






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






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






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






36. The loudest point of a Full Scale system






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






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






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






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






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






42. The amount of energy at each wavelength






43. Digital (binary) measurements of how long each pulse is either on or off; Width of increasing voltage or decreasing voltage is assigned a 1 or 0 respectively






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






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






46. 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






47. EBU






48. Cable used to transmit data; Inner cable is surrounded by a plastic insulator - which is surrounded by a wire mesh conductor that insulates the internal signal wire from external interference and an outer casing that functions as a ground






49. 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






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