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. A situation where a calculated value cannot fit into the number of digits reserved for it






2. MPEG; Standardizing body of audio coding






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






4. Roughly around 1 -130 ft/s






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






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






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






8. 4.38 GB; SS/SL






9. 'Reconstructing' part of digital audio






10. Sample Rate x Bit Depth x # of Channels






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






12. Used as the main disc from which other discs are made; Composed of ground glass with a very fine photoresistor layer; An imaging laser burns pit and land patterns in preparation for duplication






13. Decibels Full Scale






14. 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.






15. A sample- by- sample operation on two signals






16. 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






17. 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






18. The loudest point of a Full Scale system






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






20. 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






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






22. 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






23. Have odd numbered harmonics






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






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






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






27. 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






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






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






30. Defines the number of sample per second taken from a continuous signal to make a discrete signal; Governs the frequency response of digital audio






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






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






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






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






35. Level above which audible sounds are painful (125 - 130 db)






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






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






38. ADPCM; Pulse code modulation that produces a digital signal with a lower bit rate than standard PCM; Records only the difference between samples






39. Very selective method of lowering buffer levels by halting different levels of audio processing






40. Splits the input signal and mixes it with an analog copy so that no latency is present






41. Industry Standards: -6 dB Peak = -20 RMS Meter






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






43. (AES/EBU); 110O - 2- channel balanced digital audio cable with an XLR connection; NOT a mic cable!!






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






45. 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






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






47. Very quiet digital amplifier that produces a series of output pulses with the audio signal coded the same as the width of the output pulses; Pulses are used to represent wave forms and are either on or off; Intense signals have long pulses with short






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






49. 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






50. 8- in/8- out on one cable; 25- pin D- sub connector