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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. More accuracy in low amplitudes and less in higher amplitudes






2. 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






3. Overtones that contribute to the timbre of a sound and make up a complex waveform's physical characteristics






4. Data reduction technique that selectively removes original information in order to significantly reduce the file size; Some data is lost; Files can be reduced up to 99% in size (90% with no perceived sound quality loss); Bit rate effects the perceive






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






6. Improper (false) sampling of high frequencies that cause much lower frequencies to be produced when the audio is reconstructed; Foldover happens at higher frequencies as harmonics reach levels that exceed the Nyquist limit.






7. Samples are duplicated and the playback sampling rate correspondingly increased; Significantly raises the Nyquist limit to a range well beyond human hearing; Processing 'pushes' the distortion resulting from quantization error into these higher frequ






8. Eight channel digital surround sound system by Dolby






9. 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






10. 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






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






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






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






15. The frequency range that is allowed through a filter






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






17. The mathematics - algorithms - and the techniques used to manipulate signals after they have been converted to digital form






18. The act of a frequency swinging back and forth with a steady - uninterrupted rhythm






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






20. AES






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






22. Eliminates frequencies above the Nyquist limit from becoming samples; Occurs prior to quantization






23. 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






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






25. Mixing data and control characters in a single operation






26. Sample Rate x Bit Depth x # of Channels






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






28. Decibels Full Scale






29. Data transmission protocol over which computer network traffic travels; Poorly suited to real- time transmission but numerous attempts have been made to harness the technology because of its flexible routing; Uses simple Cat5 cabling; Resists interfe






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






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






32. 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






33. Ratio of magnitude of the analytical signal to the magnitude of the background noise signal






34. Algorithm uses matrix of a mid/side microphone pair to determine a side signal & that signal is reduced then distributed as code in stereo






35. Signal that uses variable voltage to create continuous waves resulting in an inexact transmission






36. Roughly around 1 -130 ft/s






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






38. Series of dots and dashes representing the letters of the alphabet; Most common letters are represented by the shortest dots and dashes; Example of entropy coding






39. In order to play multiple channels at one time data is buffered as read to disk; Latency happens between play command & beginning of playback






40. 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






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






42. 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






43. MPEG; Standardizing body of audio coding






44. Splits the input signal and mixes it with an analog copy so that no latency is present






45. 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






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






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






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






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






50. The amount of energy at each wavelength







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