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. Measure of the amplitude of a longitudinal wave






2. When recording you want the smallest buffer available; When mixing you want the largest buffer available






3. 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)






4. 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.






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






6. 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






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






8. 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






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






10. 1st commercially successful AoE format for the transmission of digital audio - video - and control signals over 64- channel 100Mbps Ethernet networks






11. 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






12. Waveform of a pure tone showing simple harmonic motion






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






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






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






16. 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






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






18. Eight channel digital surround sound system by Dolby






19. Branch of psychology concerned with the subjective perception of sound






20. 16-Bit; 44.1 kHz; PCM; Stereo






21. Full Scale; Type of metering that measures level in digital recording system; Recording and Mixing levels should NEVER exceed 0dB FS in digital audio or clipping will occur






22. Specific set of instructions for carrying out a data reduction technique that determines how to 'save' binary data information efficiently






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






24. 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






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






26. 8- in/8- out on one cable; 25- pin D- sub connector






27. Digital Word -> Series of Resistors (each with assigned charges) -> Sample- and-Hold Circuit -> Anti-Imaging Filter (Smoothing Filter) -> Reconstructed Sample






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






29. 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






30. 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






31. 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






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






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






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






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






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






37. Serial Copy Management System; main difference between AES3 & S/PIDF






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






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






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






41. 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






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






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






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






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






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






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






48. Increases or decreases the digital signal so that the loudest sample is brought up to 0dBfs; Uses all bits from dynamic range and makes it even from track to track






49. 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






50. Low Pressure; Part in a longitudinal wave where the particles are spread apart







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