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






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






3. 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






4. Used when the reference pressure of a sound is 20 microPa (0.00002); Sound Pressure Level; Measure of amplitude






5. Represents the amplitude component of the digital sampling process; Technique of incrementing a continuous analog event into a discrete set of binary digits (bits)






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






7. Decibels Full Scale






8. 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






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






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






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






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






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






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






15. Have odd numbered harmonics






16. EBU






17. 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






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






19. 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






20. 4.38 GB; SS/SL






21. 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






22. Eight channel digital surround sound system by Dolby






23. 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






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






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






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






27. Inner ear component that attaches to the stapes and helps to decrease the amplitude of vibrations; Causes the masking phenomenon






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






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






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






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






32. The loudest point of a Full Scale system






33. 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






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






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






36. Governs the frequency response of a digital system; The highest- frequency component that can be captured with a sampling rate; always 1/2 of sampling rate; Also called the limiting frequency






37. 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






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. MPEG; Standardizing body of audio coding






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






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






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






43. Mixing data and control characters in a single operation






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






45. Improper (false) sampling of high frequencies that cause much lower frequencies to be produced when the audio is reconstructed; Foldover happens at higher frequencies as harmonics reach levels that exceed the Nyquist limit.






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






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






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






49. (Time Based) Frequency: Aliasing; Anti-Aliasing Filter; Sample Rate; Nyquist Limit






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