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






2. Sony and Philips optical disc format; Utilizes sigma delta DSD to offer higher resolution; 1- bit; 2.8224 MHz; 6-Channel






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






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






5. 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






6. (AES/EBU); 110O - 2- channel balanced digital audio cable with an XLR connection; NOT a mic cable!!






7. Data reduction technique that selectively removes original information in order to significantly reduce the file size; Some data is lost; Files can be reduced up to 99% in size (90% with no perceived sound quality loss); Bit rate effects the perceive






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






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






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






11. Sony sigma- delta modulation based technology that bypasses the decimation and interpolation steps found in PCM converters






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






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






14. Splits the input signal and mixes it with an analog copy so that no latency is present






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






16. Series of dots and dashes representing the letters of the alphabet; Most common letters are represented by the shortest dots and dashes; Example of entropy coding






17. As sample rate is increased more room is created for a smoother slope of the attenuation band because Nyquist limit extends well beyond range of hearing with each increase






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






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






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






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






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






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






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






25. 8.75 GB; DS/SL






26. The act of a frequency swinging back and forth with a steady - uninterrupted rhythm






27. 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.






28. Smallest interval measurable by a scientific instrument; Defined by bit rate (sample rate x bit depth)






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






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






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






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






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






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






35. 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)






36. Decibels Full Scale






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






38. 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






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






40. 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






41. The loudest point of a Full Scale system






42. 12.33 GB; DS/ML






43. 16-Bit; 44.1 kHz; PCM; Stereo






44. 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






45. Waveform of a pure tone showing simple harmonic motion






46. Measure of the amplitude of a longitudinal wave






47. Mixing data and control characters in a single operation






48. Playback; I/O Connections; CPU (Streaming); Conversion from DAW or Software






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






50. The elapsed time it takes for a packet of data to arrive at its destination; Lagging or pause of an audio signal as digital processing occurs; Can be managed utilizing several forms of 'audio monitoring'