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. Mixing data and control characters in a single operation






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






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






4. Perceptual coding technique that uses louder sounds of a similar frequency to decide what information is to be saved during data reduction






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






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






7. 'Reconstructing' part of digital audio






8. 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






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






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






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






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






13. Full Scale; Type of metering that measures level in digital recording system; Recording and Mixing levels should NEVER exceed 0dB FS in digital audio or clipping will occur






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






15. Subtract place values from the decimal number and place ones or zeros in the correct places






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






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






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






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






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






21. 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






22. 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






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






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






25. 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






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






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






28. 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






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






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






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






32. 12.33 GB; DS/ML






33. Eight channel digital surround sound system by Dolby






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






35. 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






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






37. 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






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






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






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






41. Smallest interval measurable by a scientific instrument; Defined by bit rate (sample rate x bit depth)






42. 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






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






44. Same as 'aliasing'






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






46. 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.






47. 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






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






49. Sample Rate x Bit Depth x # of Channels






50. 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