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






2. Based on psychoacoustics - these are the basis of frequency analysis for a perceptual codec;






3. As sample rate is increased more room is created for a smoother slope of the attenuation band because Nyquist limit extends well beyond range of hearing with each increase






4. A situation where a calculated value cannot fit into the number of digits reserved for it






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






6. 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






7. Based on Full Scale (dB/FS); -6dB represents a loss of one bit so account for this when calculating






8. Have odd numbered harmonics






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






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






11. 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






12. Waveform of a pure tone showing simple harmonic motion






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






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






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






16. 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






17. 8- in/8- out on one cable; 25- pin D- sub connector






18. 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






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






20. Multi-Bit Words; (Pulse Code Modulation)






21. Difference in brightness between land and pit on a CD Physical Format






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






23. Eight channel digital surround sound system by Dolby






24. 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






25. Built into DAWs; Bits are added when signals are mixed together to avoid clipping






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






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






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






29. Signal conversions are mixed with playback tracks resulting in near-zero latency






30. 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






31. A digital filter's time domain output sequence when the input is a single sample is input






32. Also known as equal loudness curves; Graph that indicates the average ear sensitivity to different frequencies at different SPL levels (as volume increases - these curves flatten out)






33. 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






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






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






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






37. Toshiba developed digital audio interface utilizes fiber optics as a transmission medium.






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






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






40. 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






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






42. 12.33 GB; DS/ML






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






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






45. Most significant lossless coding technique in current use; Measure of disorder in which long strings of data are represented by short symbols and uses the shortest symbols to represent the most common repetitive audio data maximizing data reduction






46. The amount of energy at each wavelength






47. 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)






48. 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






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






50. 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