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






2. Voltage -> Dither -> Anti-Aliasing (Low Pass Filter) -> Sample & Hold Circuit -> Successive Approximation/Quantizer --) 100111010 (PCM Audio File)






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






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






5. 12cm plastic disc; 1.2mm thick; One- sided; Red Laser; 1.6 microns between tracks; 125 nanometer pits






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






7. Eight channel digital surround sound system by Dolby






8. 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






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






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






11. Have odd numbered harmonics






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






13. 16-Bit; 44.1 kHz; PCM; Stereo






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






15. The frequency range that is allowed through a filter






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






17. 8.75 GB; DS/SL






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






19. 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






20. The amount of energy at each wavelength






21. 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






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






23. 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






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






25. MPEG; Standardizing body of audio coding






26. 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






27. 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






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






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






30. A frequency specified for a filter (digital or electronic) the marks the point at which the frequency content of a signal is altered +/- 3dB






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






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






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






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






36. Measure of the amplitude of a longitudinal wave






37. Reduces the percieved distortion due to quantization error; Low level white noise source is introduced to make the profile of the quantization 'noise' more irregular; Useful when reducing the number of bits per word in a signal (i.e. when converting






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






39. Deviation from a normal - steady pulse or tick of a clock that contributes to misrepresentation of a signal; Result of small timing irregularities that become magnified during the transmission of digital signals as the signals are passed from one dev






40. 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






41. 'Capturing' part of digital audio; Never captures a signal perfectly






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






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






44. Subtract place values from the decimal number and place ones or zeros in the correct places






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






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






47. (Time Based) Frequency: Aliasing; Anti-Aliasing Filter; Sample Rate; Nyquist Limit






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






49. Same as 'aliasing'






50. 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







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