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. Anytime bit depth is reduced the gap gets bigger so more dithering is required






2. 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






3. Voltage -> Dither -> Anti-Aliasing (Low Pass Filter) -> Sample & Hold Circuit -> Successive Approximation/Quantizer --) 100111010 (PCM Audio File)






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






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






6. Defines the number of sample per second taken from a continuous signal to make a discrete signal; Governs the frequency response of digital audio






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






8. A time regulator that makes all samples and bits to align when working with interconnected digital devices; Basically a signal that all of the digital devices refer to when operating.






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






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






11. 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






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






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






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






15. Waveform of a pure tone showing simple harmonic motion






16. Lossless Format; Can hold up to 25GB on a single- layer disc and 50GB on a dual- layer disc






17. 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






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






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






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






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






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






23. 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






24. Method of representing an acoustic quantity with a series of binary numbers; Can have only specific individually distinct values






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






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






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






28. 12.33 GB; DS/ML






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






30. Circuit that interprets the meaning of the symbols as they were chosen and arranged by the encode






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






32. DAW's and software must buffer when converting or bouncing and this latency can add up if not monitored






33. ABR; Codecs that encode data by determining how dense or sparse areas of the audio are while also keeping bit rate within specified limits to avoid rebuffering






34. Contains all even and odd harmonics associated with a fundamental tone - making it a rich source for modeling other sounds; Amplitude of each overtone decreases exponentially as a ratio of the harmonic's frequency to that of the fundamental






35. Amplitude meter that takes the square root of all instantaneous amplitudes and averages them to find a mean and squares that value; Useful with particularly complex waveforms






36. 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'






37. High Pressure - Part of a longitudinal wave where the particles of the medium are close together






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






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






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






41. Digital (binary) measurements of how long each pulse is either on or off; Width of increasing voltage or decreasing voltage is assigned a 1 or 0 respectively






42. 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






43. Discrete incremental distinctions made between the value of one sample and the next; Breaks down bit depth into a series of evenly spaced intervals






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






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






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






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






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






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






50. 12cm plastic disc; 1.2mm thick; One- sided; Red Laser; 1.6 microns between tracks; 125 nanometer pits