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. Have odd numbered harmonics






2. 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






3. 7.95 GB; SS/DL






4. 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






5. 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)






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






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






8. 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






9. 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






10. CBR; Codecs encodes data at a constant rate regardless of density of the audio file






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






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






13. The difference in volume between the loudest and quietest sounds of a source






14. 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






15. 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






16. Decibels Full Scale






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






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






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






21. 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






22. Sample Rate x Bit Depth x # of Channels






23. 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






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






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






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






27. AES






28. Data reduction technique that does not effect quality of original audio; No effect on original quality; Typically around 50% reduction; Exact reconstruction of digital code for the audio signal






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






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






31. The amount of energy at each wavelength






32. 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






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






34. Digital Word -> Series of Resistors (each with assigned charges) -> Sample- and-Hold Circuit -> Anti-Imaging Filter (Smoothing Filter) -> Reconstructed Sample






35. Data is transmitted over fiber optic lines; Uses a TOSLINK connecter instead of an RCA type; Can transmit multi- channel audio; Not susceptible to ground hum and loops; Able to support far higher rates of data transfer over greater distances than coa






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






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






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






39. 4.38 GB; SS/SL






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






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






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






43. 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






44. The ability of a digital system to perform complex DSP without running into problems with overflow or loss of resolution






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






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






47. 16-Bit; 44.1 kHz; PCM; Stereo






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






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






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