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 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.






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






3. The difference between the analog value and the approximated digital value due to the 'rounding' that occurs while converting the analog signal to digital






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






5. 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






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






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






8. 15.9 GB; DS/DL






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






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






11. 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






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






13. Waveform of a pure tone showing simple harmonic motion






14. 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






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






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






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






18. Ratio of magnitude of the analytical signal to the magnitude of the background noise signal






19. 'Reconstructing' part of digital audio






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






21. 1.) Taking a series of evenly- spaced measurements 2.) Signal contains no frequency components higher than half the sample rate






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






23. 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






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






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






26. Most significant lossless coding technique in current use; Measure of disorder in which long strings of data are represented by short symbols and uses the shortest symbols to represent the most common repetitive audio data maximizing data reduction






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






28. 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






29. Occurs as data is assembled into meaningful bits or information and as left & right channels are separated






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






31. Decibels Full Scale






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






33. AES






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






35. 8.75 GB; DS/SL






36. 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






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






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






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






40. 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






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






42. 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






43. Measure of the amplitude of a longitudinal wave






44. 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






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






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






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






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






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






50. Anytime bit depth is reduced the gap gets bigger so more dithering is required