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






2. 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






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






4. Have odd numbered harmonics






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






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






7. Stores only one copy of a stereo signal and assigns it to both channels in order to save 50% of original bandwidth






8. Mixing data and control characters in a single operation






9. 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






10. 1st commercially successful AoE format for the transmission of digital audio - video - and control signals over 64- channel 100Mbps Ethernet networks






11. 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






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






13. 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






14. Ratio of magnitude of the analytical signal to the magnitude of the background noise signal






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






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






17. Reduces A/D sample rate from the oversampled rate to nominal rate by turning series of one- bit samples into a series of multi- bit PCM samples; (ex. => 2.8MHz sample rate converted to 44.1kHz and simultaneously converts 1-Bit samples to multi- bit);






18. 15.9 GB; DS/DL






19. The set of rules that computers use to move files from one computer to another on an internet






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






21. 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






22. The amount of energy at each wavelength






23. 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






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






25. HD Audio format; Lossless Compression; 24- bit/96 kHz; 5.1 Surround or 24- bit / 192 kHz stereo sound






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






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






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






29. 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






30. 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






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






32. 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






33. 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






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






35. 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






36. Psychoacoustic model of data reduction used for general audio compression that aims to transmit only features perceptible to the human ear; Useful for mastering streaming media






37. 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






38. Only 2 digits used; The value of each place (ones - hundreds - etc.) are as follows from greatest to least: 128 - 64 - 32 - 16 - 8 - 4 - 2 - 1






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






40. 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






41. Eight channel digital surround sound system by Dolby






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






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






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






45. 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)






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






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






48. 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






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






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