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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. Apple Lossless; Windows Media Lossless; DTS HD Master Audio; Dolby True HD; FLAC






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






3. The frequency range that is allowed through a filter






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






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






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






7. 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






8. Fractional part of a floating- point number; Also called the mantissa; Defines precision






9. 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






10. Deviation from a normal - steady pulse or tick of a clock that contributes to misrepresentation of a signal; Result of small timing irregularities that become magnified during the transmission of digital signals as the signals are passed from one dev






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






12. Same as 'aliasing'






13. 8- in/8- out on one cable; 25- pin D- sub connector






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






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






16. 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






17. Describes acceptable data - performances both offered and essential for a disc player - and the complete user experience






18. The act of a frequency swinging back and forth with a steady - uninterrupted rhythm






19. 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






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






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






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






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






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






25. 12cm plastic disc; 1.2mm thick; One- sided; Red Laser; 1.6 microns between tracks; 125 nanometer pits






26. 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






27. Allows for an internal sample rate at multiples of the input and output rates; Alleviates the need for steep 'brickwall' filters; Often combined with internal '1- bit' processing; Increases smoothing effect






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






29. 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






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






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






32. The loudest point of a Full Scale system






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






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






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






36. 15.9 GB; DS/DL






37. AES






38. EBU






39. 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






40. If a signal is sampled at a rate higher than twice the highest significant signal frequency and at evenly spaced intervals - then the samples contain all the information of the original signal






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






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






43. 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)






44. 4.38 GB; SS/SL






45. Waveform of a pure tone showing simple harmonic motion






46. Occurs as data is assembled into meaningful bits or information and as left & right channels are separated






47. MPEG; Standardizing body of audio coding






48. Contains all even and odd harmonics associated with a fundamental tone - making it a rich source for modeling other sounds; Amplitude of each overtone decreases exponentially as a ratio of the harmonic's frequency to that of the fundamental






49. Based on Full Scale (dB/FS); -6dB represents a loss of one bit so account for this when calculating






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







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