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






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






3. Toshiba developed digital audio interface utilizes fiber optics as a transmission medium.






4. Computer program or device capable of encoding and/or decoding a digital data stream with the end result being a reduced file size






5. 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






6. Measuring equipment in A/D conversion that processes voltage and provides a value for that voltage






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






8. Method of sampling data at a higher resolution (higher sample rate) as a means of reducing harmonic content during D/A conversion; (x2) oversampling gets rid of all odd harmonic content






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






10. 7.95 GB; SS/DL






11. Sample Rate x Bit Depth x # of Channels






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






13. HD Audio format; Lossless Compression; 24- bit/96 kHz; 5.1 Surround or 24- bit / 192 kHz stereo sound






14. 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






15. Multi-Bit Words; (Pulse Code Modulation)






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






17. Found that aliasing was always a problem no matter how fast you sample; Less data recorded but more accurate; 2 samples per wave length.






18. 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






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






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






21. EBU






22. Removes high frequency images and noise and smoothes the stair case output coming from of the sample and hold circuit; Also called a SMOOTHING FILTER






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






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






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






26. Increases D/A sample rate from nominal rate to oversampling rate by turning series multi- bit PCM samples into 1- bit samples; (ex. => 44.1kHz sample rate converted to 2.8MHz and simultaneously converts multi- bit samples to 1- bit); Low Pass Filter






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






28. 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






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






30. 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






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






32. Anytime bit depth is reduced the gap gets bigger so more dithering is required






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






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






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






36. 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






37. Take up half as many bits (50%); Algorithm can keep same quality by lossing the stereo track






38. The amount of energy at each wavelength






39. The number of compressions or rarefactions in one second; The higher the frequency the more compressions & rarefactions per second; Measured in Hertz






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






41. 15.9 GB; DS/DL






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






43. 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'






44. 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






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






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






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






48. 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






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






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