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






2. Data reduction technique that does not effect quality of original audio; No effect on original quality; Typically around 50% reduction; Exact reconstruction of digital code for the audio signal






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






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






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






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






7. 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






8. Process of building a complex tone by starting with the fundamental frequency and adding pure tone harmonics






9. 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






10. Eight channel digital surround sound system by Dolby






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






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






13. 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






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






15. 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






16. Full Scale; Type of metering that measures level in digital recording system; Recording and Mixing levels should NEVER exceed 0dB FS in digital audio or clipping will occur






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






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






19. Digital (binary) measurements of how long each pulse is either on or off; Width of increasing voltage or decreasing voltage is assigned a 1 or 0 respectively






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






21. 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






22. 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






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






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






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






26. Method of sampling data at a higher resolution (higher sample rate) as a means of reducing harmonic content during D/A conversion; (x2) oversampling gets rid of all odd harmonic content






27. 16-Bit; 44.1 kHz; PCM; Stereo






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






29. 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'






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






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






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






33. Very selective method of lowering buffer levels by halting different levels of audio processing






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






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






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






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






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






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






40. 'Reconstructing' part of digital audio






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






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






43. Single- pin RCA cable or fiber- optic TOSLINK connector used for digital transfer; 75O coaxial - 2- channel unbalanced; 'Consumer' format of AES3






44. 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






45. As sample rate is increased more room is created for a smoother slope of the attenuation band because Nyquist limit extends well beyond range of hearing with each increase






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






47. Sample Rate x Bit Depth x # of Channels






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






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






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







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