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






2. 4.38 GB; SS/SL






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






4. 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.






5. Ultra low- latency - 512- channel (on a gigabit network) - less flexible AoE format; Routed like audio cables...not network cables






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






7. 1.) Taking a series of evenly- spaced measurements 2.) Signal contains no frequency components higher than half the sample rate






8. 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






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






10. Voltage -> Dither -> Anti-Aliasing (Low Pass Filter) -> Sample & Hold Circuit -> Successive Approximation/Quantizer --) 100111010 (PCM Audio File)






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






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






13. AES






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






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






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






17. Also known as equal loudness curves; Graph that indicates the average ear sensitivity to different frequencies at different SPL levels (as volume increases - these curves flatten out)






18. 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'






19. 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






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






21. 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






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






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






24. Having a repeated succession of waves or curves as in a sound waveform






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






26. Data is transmitted over fiber optic lines; Uses a TOSLINK connecter instead of an RCA type; Can transmit multi- channel audio; Not susceptible to ground hum and loops; Able to support far higher rates of data transfer over greater distances than coa






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






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






29. 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






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






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






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






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






34. 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






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






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






37. 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






38. Waveform of a pure tone showing simple harmonic motion






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






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






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






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






43. 15.9 GB; DS/DL






44. Number of bits used to represent the smallest unit of information in an audio file; Greater bit depth = better quality audio






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






46. Same as 'aliasing'






47. 8- in/8- out on one cable; 25- pin D- sub connector






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






49. AAC (Advanced Audio Coding); MP3; RA; WMA; OGG Vorbis; Dolby Digital/AC-3; DTS; ADPCM






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