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






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






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






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






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






6. Waveform of a pure tone showing simple harmonic motion






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






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






9. As sample rate is increased more room is created for a smoother slope of the attenuation band because Nyquist limit extends well beyond range of hearing with each increase






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






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






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






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






14. The frequency range that is allowed through a filter






15. 1st commercially successful AoE format for the transmission of digital audio - video - and control signals over 64- channel 100Mbps Ethernet networks






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






17. 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






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






19. Governs the frequency response of a digital system; The highest- frequency component that can be captured with a sampling rate; always 1/2 of sampling rate; Also called the limiting frequency






20. 16-Bit; 44.1 kHz; PCM; Stereo






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. 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






23. The continuous loss of signal strengths as a signal travels through a medium






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






25. Allows for an internal sample rate at multiples of the input and output rates; Alleviates the need for steep 'brickwall' filters; Often combined with internal '1- bit' processing; Increases smoothing effect






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






27. 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






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






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






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






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






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






33. Root Mean Square; Refers to taking the square root of all instantaneous amplitudes; Takes the average of those squares; (-6 Peak Level is approximately equal to -20 RMS)






34. 12.33 GB; DS/ML






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






36. Describes acceptable data - performances both offered and essential for a disc player - and the complete user experience






37. 7.95 GB; SS/DL






38. The difference between the analog value and the approximated digital value due to the 'rounding' that occurs while converting the analog signal to digital






39. 8- in/8- out on one cable; 25- pin D- sub connector






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






41. 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






42. CobraNet; EtherSound; Dante; AVB (currently under development)






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






44. Same as 'aliasing'






45. AES






46. The amount of energy at each wavelength






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






48. 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






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






50. 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