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. 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






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






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






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






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






6. The frequency range that is allowed through a filter






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






8. 15.9 GB; DS/DL






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






10. 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






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






12. Joint-Stereo Technique; Since the human brain is unable to localize sounds at high frequencies well sounds above 9 kHz threshold are encoded in mono






13. 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






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






15. 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






16. CBR; Codecs encodes data at a constant rate regardless of density of the audio file






17. Measure of the amplitude of a longitudinal wave






18. 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






19. 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);






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






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






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






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






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






25. 'Capturing' part of digital audio; Never captures a signal perfectly






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. 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






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






29. 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






30. 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






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






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






33. 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






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






35. Softest sound that can be heard by the average human ear (0 dB)






36. 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






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






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






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






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






41. 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






42. The set of rules that computers use to move files from one computer to another on an internet






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






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






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






46. The number of compressions or rarefactions in one second; The higher the frequency the more compressions & rarefactions per second; Measured in Hertz






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






48. The frequency above or below which attenuation begins in a filter circuit






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






50. 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