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. Having a repeated succession of waves or curves as in a sound waveform






2. 16-Bit; 44.1 kHz; PCM; Stereo






3. 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






4. Based on Full Scale (dB/FS); -6dB represents a loss of one bit so account for this when calculating






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






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






7. 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






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






9. 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)






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






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






12. 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);






13. Based on psychoacoustics - these are the basis of frequency analysis for a perceptual codec;






14. 8.75 GB; DS/SL






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






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






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






18. 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.






19. Measure of the amplitude of a longitudinal wave






20. 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'






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






22. Sample Rate x Bit Depth x # of Channels






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






24. 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






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






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






27. Same as 'aliasing'






28. 'Reconstructing' part of digital audio






29. 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






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






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






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






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






34. Removes high frequency images and noise and smoothes the stair case output coming from of the sample and hold circuit; Also called a SMOOTHING FILTER






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






36. Have odd numbered harmonics






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






38. Very selective method of lowering buffer levels by halting different levels of audio processing






39. 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






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






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






42. Multi-Bit Words; (Pulse Code Modulation)






43. 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






44. 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






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






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






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






48. AES






49. 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






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