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. DAW's and software must buffer when converting or bouncing and this latency can add up if not monitored






2. The loudest point of a Full Scale system






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






4. 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






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






6. 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






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 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






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






10. CBR; Codecs encodes data at a constant rate regardless of density of the audio file






11. Measurement at regular intervals of the amplitude of a varying waveform (in order to convert it to digital form); There must be a minimum of 2 samples for each cycle in a waveform






12. 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






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






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






15. Root Mean Square; Refers to taking the square root of all instantaneous amplitudes; Takes the average of those squares; (-6 Peak Level is approximately equal to -20 RMS)






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






17. 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






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






19. 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






20. 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






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






22. 7.95 GB; SS/DL






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






24. In order to play multiple channels at one time data is buffered as read to disk; Latency happens between play command & beginning of playback






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






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






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






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






29. The continuous loss of signal strengths as a signal travels through a medium






30. Samples are duplicated and the playback sampling rate correspondingly increased; Significantly raises the Nyquist limit to a range well beyond human hearing; Processing 'pushes' the distortion resulting from quantization error into these higher frequ






31. 8.75 GB; DS/SL






32. EBU






33. Eight channel digital surround sound system by Dolby






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






35. Number or variable that represents the number of times the base of a power is used as a factor; Defines magnitude






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






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






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






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






40. 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)






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






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






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






44. Very quiet digital amplifier that produces a series of output pulses with the audio signal coded the same as the width of the output pulses; Pulses are used to represent wave forms and are either on or off; Intense signals have long pulses with short






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






46. 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






47. Decibels Full Scale






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






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






50. Method used in digital recording and reproduction in which a signal is sampled at various points and the resulting value is translated into binary numbers