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






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






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






4. 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






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






6. 12.33 GB; DS/ML






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






8. Waveform of a pure tone showing simple harmonic motion






9. 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






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






11. CobraNet; EtherSound; Dante; AVB (currently under development)






12. 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)






13. ADAT Optcal; 8- in/8- out on two cables; Fiber- optic - TOSLINK connector






14. 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






15. Increases D/A sample rate from nominal rate to oversampling rate by turning series multi- bit PCM samples into 1- bit samples; (ex. => 44.1kHz sample rate converted to 2.8MHz and simultaneously converts multi- bit samples to 1- bit); Low Pass Filter






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






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






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






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






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






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






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






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






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






25. Snippets of time in which frequency analysis takes place in a perceptual codec






26. MPEG; Standardizing body of audio coding






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






28. Series of dots and dashes representing the letters of the alphabet; Most common letters are represented by the shortest dots and dashes; Example of entropy coding






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






30. The amount of energy at each wavelength






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






32. The loudest point of a Full Scale system






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






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






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






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






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






39. Measuring equipment in A/D conversion that processes voltage and provides a value for that voltage






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






41. 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






42. HD Audio format; Lossless Compression; 24- bit/96 kHz; 5.1 Surround or 24- bit / 192 kHz stereo sound






43. How Loud (Y-Axis) & How Fast (X-Axis)






44. 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






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






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






47. 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






48. ABR; Codecs that encode data by determining how dense or sparse areas of the audio are while also keeping bit rate within specified limits to avoid rebuffering






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






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