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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.
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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. 8.75 GB; DS/SL






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






3. Unit of measurement that is equal to one millionth of a meter






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






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






6. Describes various optical disc characteristics including the size and shape of the disc - the size of pits - the speed at which the disc spins - and a multitude of aspects regarding the specifications of the player itself






7. 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






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






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






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






11. 8- in/8- out on one cable; 25- pin D- sub connector






12. The loudest point of a Full Scale system






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






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






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






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






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






18. Waveform of a pure tone showing simple harmonic motion






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






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






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






23. Process of building a complex tone by starting with the fundamental frequency and adding pure tone harmonics






24. 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






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






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






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






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






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






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






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






32. CBR; Codecs encodes data at a constant rate regardless of density of the audio file






33. 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






34. 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






35. Rate at which energy is drawn from a source that produces a flow of electricity in a circuit; Expressed in volts






36. 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






37. 12.33 GB; DS/ML






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






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






41. 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






42. 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






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






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






45. Psychoacoustic model of data reduction used for general audio compression that aims to transmit only features perceptible to the human ear; Useful for mastering streaming media






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






47. A sample- by- sample operation on two signals






48. Fractional part of a floating- point number; Also called the mantissa; Defines precision






49. French mathematician that noted that any complex sound can be broken down into a series of component pure tones






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







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