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






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






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






4. 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






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






6. 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






7. 'Reconstructing' part of digital audio






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






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






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






11. 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






12. 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






13. 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






14. Sample Rate x Bit Depth x # of Channels






15. Inner ear component that attaches to the stapes and helps to decrease the amplitude of vibrations; Causes the masking phenomenon






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






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






18. Amplitude meter that takes the square root of all instantaneous amplitudes and averages them to find a mean and squares that value; Useful with particularly complex waveforms






19. 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.






20. 15.9 GB; DS/DL






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






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






23. 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






24. Roughly around 1 -130 ft/s






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






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






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






28. 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






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






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






31. Difference in brightness between land and pit on a CD Physical Format






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






33. Low Pressure; Part in a longitudinal wave where the particles are spread apart






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






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






36. 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






37. 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






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






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






40. Digital and analog processing capability is combined on a single microchip allowing for 1- bit resolution at high sample rates






41. Snippets of time in which frequency analysis takes place in a perceptual codec






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






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






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






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






46. Discrete incremental distinctions made between the value of one sample and the next; Breaks down bit depth into a series of evenly spaced intervals






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






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






49. 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






50. The set of rules that computers use to move files from one computer to another on an internet