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






2. 15.9 GB; DS/DL






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






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






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






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






7. 1st commercially successful AoE format for the transmission of digital audio - video - and control signals over 64- channel 100Mbps Ethernet networks






8. 7.95 GB; SS/DL






9. Joint-Stereo Technique; Since the human brain is unable to localize sounds at high frequencies well sounds above 9 kHz threshold are encoded in mono






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






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






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






13. The process of reducing the space required to store data by efficiently encoding the content.






14. Sample Rate x Bit Depth x # of Channels






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






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






17. 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






18. Signal that uses variable voltage to create continuous waves resulting in an inexact transmission






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






20. 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






21. A network communications protocol that specifies how machines will exchange data; Uses a broadcast system in which one machine transmits its message on the communication medium and the other machines listen for messages directed to them






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






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






24. A frequency specified for a filter (digital or electronic) the marks the point at which the frequency content of a signal is altered +/- 3dB






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






26. Lossless Format; Can hold up to 25GB on a single- layer disc and 50GB on a dual- layer disc






27. 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






28. Same as 'aliasing'






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






30. Have odd numbered harmonics






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






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






33. More aggressive lossy data reduction techniques that require further manipulation of the stereo field; Examples are 'Intensity' & 'M-S'






34. 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






35. Signal conversions are mixed with playback tracks resulting in near-zero latency






36. 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






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






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






39. 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






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






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






42. Computer program or device capable of encoding and/or decoding a digital data stream with the end result being a reduced file size






43. Number of bits used to represent the smallest unit of information in an audio file; Greater bit depth = better quality audio






44. EBU






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






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






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






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






49. 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






50. 4.38 GB; SS/SL