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. 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






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






3. The amount of energy at each wavelength






4. 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






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






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






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






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






9. French mathematician that noted that any complex sound can be broken down into a series of component pure tones






10. 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






11. AAC (Advanced Audio Coding); MP3; RA; WMA; OGG Vorbis; Dolby Digital/AC-3; DTS; ADPCM






12. Roughly around 1 -130 ft/s






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






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






15. Number of bits per second processed when sampling sound; (Sampling Rate x Bit Depth) = Resolution






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






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






18. 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






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






20. The act of a frequency swinging back and forth with a steady - uninterrupted rhythm






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






22. 4.38 GB; SS/SL






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






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






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






26. 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






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






28. Single- pin RCA cable or fiber- optic TOSLINK connector used for digital transfer; 75O coaxial - 2- channel unbalanced; 'Consumer' format of AES3






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






30. The loudest point of a Full Scale system






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






32. 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.






33. 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






34. 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






35. 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






36. 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






37. 7.95 GB; SS/DL






38. 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






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






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






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






42. 16-Bit; 44.1 kHz; PCM; Stereo






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






44. 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






45. 8- in/8- out on one cable; 25- pin D- sub connector






46. Eight channel digital surround sound system by Dolby






47. VBR; Most common & best data reduction technique; Codecs that encode data by determining how dense or sparse areas of the audio are; Can result in buffering issues






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






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






50. A sample- by- sample operation on two signals