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. The loudest point of a Full Scale system






2. 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






3. 8.75 GB; DS/SL






4. 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






5. 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






6. Roughly around 1 -130 ft/s






7. 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






8. 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






9. 16-Bit; 44.1 kHz; PCM; Stereo






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






11. 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






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






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






14. 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






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






16. 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






17. Unit of measurement that is equal to one millionth of a meter






18. 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






19. Found that aliasing was always a problem no matter how fast you sample; Less data recorded but more accurate; 2 samples per wave length.






20. 12.33 GB; DS/ML






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






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






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






24. 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






25. Method of sampling data at a higher resolution (higher sample rate) as a means of reducing harmonic content during D/A conversion; (x2) oversampling gets rid of all odd harmonic content






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






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






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






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






30. Each bit in the bit depth is equal to a _____ increase in dynamic range






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






32. Digital and analog processing capability is combined on a single microchip allowing for 1- bit resolution at high sample rates






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






34. Very quiet digital amplifier that produces a series of output pulses with the audio signal coded the same as the width of the output pulses; Pulses are used to represent wave forms and are either on or off; Intense signals have long pulses with short






35. 4.38 GB; SS/SL






36. 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






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






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






39. Occurs as data is assembled into meaningful bits or information and as left & right channels are separated






40. Method of representing an acoustic quantity with a series of binary numbers; Can have only specific individually distinct values






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






42. 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






43. 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






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






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






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






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






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






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