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






2. 1st commercially successful AoE format for the transmission of digital audio - video - and control signals over 64- channel 100Mbps Ethernet networks






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






4. 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






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






6. A time regulator that makes all samples and bits to align when working with interconnected digital devices; Basically a signal that all of the digital devices refer to when operating.






7. A network communications protocol that specifies how machines will exchange data; Uses a broadcast system in which one machine transmits its message on the communication medium and the other machines listen for messages directed to them






8. Circuit that interprets the meaning of the symbols as they were chosen and arranged by the encode






9. DAW's and software must buffer when converting or bouncing and this latency can add up if not monitored






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






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






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






13. 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






14. The elapsed time it takes for a packet of data to arrive at its destination; Lagging or pause of an audio signal as digital processing occurs; Can be managed utilizing several forms of 'audio monitoring'






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






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






17. 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






18. 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






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






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






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






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






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






24. Stores only one copy of a stereo signal and assigns it to both channels in order to save 50% of original bandwidth






25. 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






26. 8- in/8- out on one cable; 25- pin D- sub connector






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






28. 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






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






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






31. Uses entropy coding as the basis; Computer data compression algorithm that packages files such as .ZIP & .RAR






32. Eight channel digital surround sound system by Dolby






33. 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






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






35. 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






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






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






38. 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






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






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






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






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






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






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






45. Contains all even and odd harmonics associated with a fundamental tone - making it a rich source for modeling other sounds; Amplitude of each overtone decreases exponentially as a ratio of the harmonic's frequency to that of the fundamental






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






47. 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






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






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






50. 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