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






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






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






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






5. Reference voltage determined by summing the voltage values of a predetermined number of previous samples; Numbers of 1 in row = waveform peak; Numbers of 0 in row = waveform trough; Basis of Sony's Direct Stream Digital (DSD)






6. Decibels Full Scale






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






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






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






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






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






12. Electromagnetic receptor that detects the radiation known as visible light






13. Voltage -> Dither -> Anti-Aliasing (Low Pass Filter) -> Sample & Hold Circuit -> Successive Approximation/Quantizer --) 100111010 (PCM Audio File)






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






15. Allowance of noise floor below that which is required for the final product






16. 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






17. The process of reducing the space required to store data by efficiently encoding the content.






18. EDL; Final list of samples used in the audio editing process; Identified by time code






19. 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






20. Measurement at regular intervals of the amplitude of a varying waveform (in order to convert it to digital form); There must be a minimum of 2 samples for each cycle in a waveform






21. Having a repeated succession of waves or curves as in a sound waveform






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






23. If a signal is sampled at a rate higher than twice the highest significant signal frequency and at evenly spaced intervals - then the samples contain all the information of the original signal






24. EBU






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






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






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






28. 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






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






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






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






32. Accuracy with which an electronic system reproduces the sound or image of its input signal






33. 15.9 GB; DS/DL






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






35. 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






36. 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.






37. 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);






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






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






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






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






42. 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






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






44. 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






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






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






47. Samples are duplicated and the playback sampling rate correspondingly increased; Significantly raises the Nyquist limit to a range well beyond human hearing; Processing 'pushes' the distortion resulting from quantization error into these higher frequ






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






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






50. Same as 'aliasing'