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. Serial Copy Management System; main difference between AES3 & S/PIDF






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






3. Twice as many samples as the highest frequency at minimum; Sampling rate totally controls frequency response






4. ADPCM; Pulse code modulation that produces a digital signal with a lower bit rate than standard PCM; Records only the difference between samples






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






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






7. Decibels Full Scale






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






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






10. 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






11. Represents the amplitude component of the digital sampling process; Technique of incrementing a continuous analog event into a discrete set of binary digits (bits)






12. Digital (binary) measurements of how long each pulse is either on or off; Width of increasing voltage or decreasing voltage is assigned a 1 or 0 respectively






13. Increases or decreases the digital signal so that the loudest sample is brought up to 0dBfs; Uses all bits from dynamic range and makes it even from track to track






14. More aggressive lossy data reduction techniques that require further manipulation of the stereo field; Examples are 'Intensity' & 'M-S'






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






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






17. 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






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






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






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






21. Eight channel digital surround sound system by Dolby






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






23. Have odd numbered harmonics






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






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






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






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






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






29. Measurement at regular intervals of the amplitude of a varying waveform (in order to convert it to digital form); There must be a minimum of 2 samples for each cycle in a waveform






30. 16-Bit; 44.1 kHz; PCM; Stereo






31. 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






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






33. Amplitude meter that takes the square root of all instantaneous amplitudes and averages them to find a mean and squares that value; Useful with particularly complex waveforms






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






35. Smallest interval measurable by a scientific instrument; Defined by bit rate (sample rate x bit depth)






36. Roughly around 1 -130 ft/s






37. AES






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






39. 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






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






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






42. Electromagnetic receptor that detects the radiation known as visible light






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






44. Sum of all harmonics; Sum of sine and cosine waves which have frequencies f - 2f - 3f - 4f...






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






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






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






48. 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






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






50. 12.33 GB; DS/ML