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. 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






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






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






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






5. Increases or decreases the digital signal so that the loudest sample is brought up to 0dBfs; Uses all bits from dynamic range and makes it even from track to track






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






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






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






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






10. 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






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






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






13. 4.38 GB; SS/SL






14. 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






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






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






17. Single- pin RCA cable or fiber- optic TOSLINK connector used for digital transfer; 75O coaxial - 2- channel unbalanced; 'Consumer' format of AES3






18. Visual graph that shows how loud a sound is at different frequencies






19. 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






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






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






22. Most significant lossless coding technique in current use; Measure of disorder in which long strings of data are represented by short symbols and uses the shortest symbols to represent the most common repetitive audio data maximizing data reduction






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






24. 'Capturing' part of digital audio; Never captures a signal perfectly






25. Decibels Full Scale






26. Measures the highest levels of a signal being recorded or mixed; Monitors for clipping - which occurs at 0dBFS); Does not always reflect perceived volume of signal






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






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






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






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






31. 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)






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






33. 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






34. 8.75 GB; DS/SL






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






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






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






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






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






40. 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






41. EBU






42. ADPCM; Pulse code modulation that produces a digital signal with a lower bit rate than standard PCM; Records only the difference between samples






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






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






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






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






47. AES






48. Have odd numbered harmonics






49. The more bits allocated during quantization - the more accurate the measurement






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