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 frequency above or below which attenuation begins in a filter circuit






2. Waveform of a pure tone showing simple harmonic motion






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






4. Decibels Full Scale






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






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






7. Eight channel digital surround sound system by Dolby






8. 16-Bit; 44.1 kHz; PCM; Stereo






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






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






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






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






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






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






15. 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






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






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






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






19. Six channel (five speakers and one subwoofer for bass) digital surround sound system by Dolby






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






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






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






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






24. Reduces A/D sample rate from the oversampled rate to nominal rate by turning series of one- bit samples into a series of multi- bit PCM samples; (ex. => 2.8MHz sample rate converted to 44.1kHz and simultaneously converts 1-Bit samples to multi- bit);






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






26. 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






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






28. Measure of sound pressure over the frequency spectrum - for which a listener perceives a constant loudness when presented with pure steady tones






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






30. ADPCM; Pulse code modulation that produces a digital signal with a lower bit rate than standard PCM; Records only the difference between samples






31. Circuit that seizes voltage values with each tick of an A/D device's internal clock






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






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






34. 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






35. Roughly around 1 -130 ft/s






36. 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






37. 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)






38. 7.95 GB; SS/DL






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






40. Signal voltage is relayed to a register from sample- and - hold circuit; Holds reference frequencies in binary form that decrease in value; Finds approximated value & assigns binary number accordingly






41. 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)






42. 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






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






44. When recording you want the smallest buffer available; When mixing you want the largest buffer available






45. How Loud (Y-Axis) & How Fast (X-Axis)






46. 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






47. Mixing data and control characters in a single operation






48. 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.






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






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