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. Measure of the amplitude of a longitudinal wave






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






3. Used when the reference pressure of a sound is 20 microPa (0.00002); Sound Pressure Level; Measure of amplitude






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






5. 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






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






8. Channels are processed one at a time and the results are stored on multiple CPU buffers that alternately send data as DAW requests the data for playback; First few seconds are relayed to the buffer prior to processing and playback and it continuously






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






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






11. Eight channel digital surround sound system by Dolby






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






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






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






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






16. 15.9 GB; DS/DL






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






18. Have odd numbered harmonics






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






20. A sample- by- sample operation on two signals






21. A frequency specified for a filter (digital or electronic) the marks the point at which the frequency content of a signal is altered +/- 3dB






22. 8- in/8- out on one cable; 25- pin D- sub connector






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






24. Mixing data and control characters in a single operation






25. The ability of a digital system to perform complex DSP without running into problems with overflow or loss of resolution






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






27. 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






28. EDL; Final list of samples used in the audio editing process; Identified by time code






29. EBU






30. 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






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






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






33. Perceptual coding technique that uses louder sounds of a similar frequency to decide what information is to be saved during data reduction






34. 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






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






36. 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'






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






38. 7.95 GB; SS/DL






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






40. 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






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






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






43. 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






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






45. 1st commercially successful AoE format for the transmission of digital audio - video - and control signals over 64- channel 100Mbps Ethernet networks






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






47. Built into DAWs; Bits are added when signals are mixed together to avoid clipping






48. 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






49. Reference voltage determined by summing the voltage values of a predetermined number of previous samples; Numbers of 1 in row = waveform peak; Numbers of 0 in row = waveform trough; Basis of Sony's Direct Stream Digital (DSD)






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