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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 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'






2. Defines the number of sample per second taken from a continuous signal to make a discrete signal; Governs the frequency response of digital audio






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






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






5. Discrete incremental distinctions made between the value of one sample and the next; Breaks down bit depth into a series of evenly spaced intervals






6. Process that begins with a fast FFT analysis of the spectra of two input signals - then the multiplication of like frequencies - and IFFT to finalize the process






7. 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






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






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






10. Circuit that interprets the meaning of the symbols as they were chosen and arranged by the encode






11. AES






12. Eight channel digital surround sound system by Dolby






13. 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






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






15. Number or variable that represents the number of times the base of a power is used as a factor; Defines magnitude






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






17. 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






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






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






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






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






22. 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






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






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






25. Contains all even and odd harmonics associated with a fundamental tone - making it a rich source for modeling other sounds; Amplitude of each overtone decreases exponentially as a ratio of the harmonic's frequency to that of the fundamental






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






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






28. Have odd numbered harmonics






29. 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.






30. Signal voltage is relayed to a register from sample- and - hold circuit; Holds reference frequencies in binary form that decrease in value; Finds approximated value & assigns binary number accordingly






31. The continuous loss of signal strengths as a signal travels through a medium






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






33. 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






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






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






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






37. 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






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






39. 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






40. 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






41. Visual graph that shows how loud a sound is at different frequencies






42. 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






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






44. 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






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






46. Only 2 digits used; The value of each place (ones - hundreds - etc.) are as follows from greatest to least: 128 - 64 - 32 - 16 - 8 - 4 - 2 - 1






47. MPEG; Standardizing body of audio coding






48. 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






49. 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






50. 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