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. 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






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






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






4. 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






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






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






7. 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






8. 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






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






10. Measures the highest levels of a signal being recorded or mixed; Monitors for clipping - which occurs at 0dBFS); Does not always reflect perceived volume of signal






11. 15.9 GB; DS/DL






12. 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






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






14. Circuit that seizes voltage values with each tick of an A/D device's internal clock






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






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






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






18. Method used in digital recording and reproduction in which a signal is sampled at various points and the resulting value is translated into binary numbers






19. AES






20. MPEG; Standardizing body of audio coding






21. 8.75 GB; DS/SL






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






23. Measure of sound pressure over the frequency spectrum - for which a listener perceives a constant loudness when presented with pure steady tones






24. 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'






25. Reduces the percieved distortion due to quantization error; Low level white noise source is introduced to make the profile of the quantization 'noise' more irregular; Useful when reducing the number of bits per word in a signal (i.e. when converting






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






27. 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






28. 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






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






30. 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






31. Roughly around 1 -130 ft/s






32. Waveform of a pure tone showing simple harmonic motion






33. 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






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






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






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






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






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






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






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






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






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






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






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






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






47. 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






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






49. Decibels Full Scale






50. 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







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