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. 8.75 GB; DS/SL






2. Toshiba developed digital audio interface utilizes fiber optics as a transmission medium.






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






4. Method of representing an acoustic quantity with a series of binary numbers; Can have only specific individually distinct values






5. 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






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






7. 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






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






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






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






11. Describes various optical disc characteristics including the size and shape of the disc - the size of pits - the speed at which the disc spins - and a multitude of aspects regarding the specifications of the player itself






12. 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






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






14. Roughly around 1 -130 ft/s






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






16. 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






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






18. 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






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






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






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






22. 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






23. Have odd numbered harmonics






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






25. The loudest point of a Full Scale system






26. 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






27. 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






28. MPEG; Standardizing body of audio coding






29. Anytime bit depth is reduced the gap gets bigger so more dithering is required






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






31. Measure of the amplitude of a longitudinal wave






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






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






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






35. 12.33 GB; DS/ML






36. Softest sound that can be heard by the average human ear (0 dB)






37. 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






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






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






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






41. 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






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






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






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






45. 4.38 GB; SS/SL






46. 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






47. 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






48. Accuracy with which an electronic system reproduces the sound or image of its input signal






49. 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






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