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. Allows for an internal sample rate at multiples of the input and output rates; Alleviates the need for steep 'brickwall' filters; Often combined with internal '1- bit' processing; Increases smoothing effect






2. 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






3. Waveform of a pure tone showing simple harmonic motion






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






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






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






7. 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






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






9. 8.75 GB; DS/SL






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






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






12. More aggressive lossy data reduction techniques that require further manipulation of the stereo field; Examples are 'Intensity' & 'M-S'






13. The loudest point of a Full Scale system






14. High Pressure - Part of a longitudinal wave where the particles of the medium are close together






15. 7.95 GB; SS/DL






16. Decibels Full Scale






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






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






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






20. 4.38 GB; SS/SL






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






22. Governs the frequency response of a digital system; The highest- frequency component that can be captured with a sampling rate; always 1/2 of sampling rate; Also called the limiting frequency






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






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






25. Measurement at regular intervals of the amplitude of a varying waveform (in order to convert it to digital form); There must be a minimum of 2 samples for each cycle in a waveform






26. 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






27. Represents the amplitude component of the digital sampling process; Technique of incrementing a continuous analog event into a discrete set of binary digits (bits)






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






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






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






31. 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






32. Amplitude meter that takes the square root of all instantaneous amplitudes and averages them to find a mean and squares that value; Useful with particularly complex waveforms






33. The amount of energy at each wavelength






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






35. The elapsed time it takes for a packet of data to arrive at its destination; Lagging or pause of an audio signal as digital processing occurs; Can be managed utilizing several forms of 'audio monitoring'






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






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






38. Same as 'aliasing'






39. 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






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






41. Found that aliasing was always a problem no matter how fast you sample; Less data recorded but more accurate; 2 samples per wave length.






42. 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






43. Sony sigma- delta modulation based technology that bypasses the decimation and interpolation steps found in PCM converters






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






45. EBU






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






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






48. 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






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






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