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






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






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






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






5. Unit of measurement that is equal to one billionth of a meter






6. 7.95 GB; SS/DL






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






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






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






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






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






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






13. Reduces the percieved distortion due to quantization error; Low level white noise source is introduced to make the profile of the quantization 'noise' more irregular; Useful when reducing the number of bits per word in a signal (i.e. when converting






14. 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






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






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






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






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






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






20. Specific set of instructions for carrying out a data reduction technique that determines how to 'save' binary data information efficiently






21. 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






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






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






24. Pertaining to hearing or sound; Combination of the intensity of air pressure molecules with amplitude






25. (AES/EBU); 110O - 2- channel balanced digital audio cable with an XLR connection; NOT a mic cable!!






26. Digital Word -> Series of Resistors (each with assigned charges) -> Sample- and-Hold Circuit -> Anti-Imaging Filter (Smoothing Filter) -> Reconstructed Sample






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






28. 'Reconstructing' part of digital audio






29. Algorithm uses matrix of a mid/side microphone pair to determine a side signal & that signal is reduced then distributed as code in stereo






30. 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






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






32. Number of bits per second processed when sampling sound; (Sampling Rate x Bit Depth) = Resolution






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






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






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






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






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






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






39. 1.) Bit Rate x Sample Rate (you'll get b/sec) 2.) Multiply by 60 if converting seconds to minutes 3.) Divide by 8 to convert bits to Bytes and get B/min 4.) Divide by 1 -024 to get KB/min and keep doing it until you get desired bit rate specification






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






41. Waveform of a pure tone showing simple harmonic motion






42. Roughly around 1 -130 ft/s






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






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






45. 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






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






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






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






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






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