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






2. Algorithm uses matrix of a mid/side microphone pair to determine a side signal & that signal is reduced then distributed as code in stereo






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






4. RAM holds in memory audio data before it is transferred to the memory controller; Certain amount of data is processed before large amounts of data are streamed to prevent latency






5. Leaving space at beginning and ending of song for data crunching during mastering; Last step in mastering process






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






7. AES






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






9. 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






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






11. 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






12. Take up half as many bits (50%); Algorithm can keep same quality by lossing the stereo track






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






14. Measure of the amplitude of a longitudinal wave






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






16. 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






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






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






19. 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'






20. 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






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






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






23. 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






24. Samples are duplicated and the playback sampling rate correspondingly increased; Significantly raises the Nyquist limit to a range well beyond human hearing; Processing 'pushes' the distortion resulting from quantization error into these higher frequ






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






26. 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






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






28. Toshiba developed digital audio interface utilizes fiber optics as a transmission medium.






29. 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






30. Uses entropy coding as the basis; Computer data compression algorithm that packages files such as .ZIP & .RAR






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






32. 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






33. More accuracy in low amplitudes and less in higher amplitudes






34. 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






35. Root Mean Square; Refers to taking the square root of all instantaneous amplitudes; Takes the average of those squares; (-6 Peak Level is approximately equal to -20 RMS)






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






37. 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






38. 12cm plastic disc; 1.2mm thick; One- sided; Red Laser; 1.6 microns between tracks; 125 nanometer pits






39. Reduces A/D sample rate from the oversampled rate to nominal rate by turning series of one- bit samples into a series of multi- bit PCM samples; (ex. => 2.8MHz sample rate converted to 44.1kHz and simultaneously converts 1-Bit samples to multi- bit);






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






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






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






43. 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)






44. 1.) Bit Rate x Sample Rate (you'll get b/sec) 2.) Multiply by 60 if converting seconds to minutes 3.) Divide by 8 to convert bits to Bytes and get B/min 4.) Divide by 1 -024 to get KB/min and keep doing it until you get desired bit rate specification






45. 8.75 GB; DS/SL






46. Snippets of time in which frequency analysis takes place in a perceptual codec






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






48. If a signal is sampled at a rate higher than twice the highest significant signal frequency and at evenly spaced intervals - then the samples contain all the information of the original signal






49. In order to play multiple channels at one time data is buffered as read to disk; Latency happens between play command & beginning of playback






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