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






2. Cable used to transmit data; Inner cable is surrounded by a plastic insulator - which is surrounded by a wire mesh conductor that insulates the internal signal wire from external interference and an outer casing that functions as a ground






3. 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






4. Increases D/A sample rate from nominal rate to oversampling rate by turning series multi- bit PCM samples into 1- bit samples; (ex. => 44.1kHz sample rate converted to 2.8MHz and simultaneously converts multi- bit samples to 1- bit); Low Pass Filter






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






6. 'Reconstructing' part of digital audio






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






8. 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






9. 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






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






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






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






13. The art of deciding where to place a processor in signal flow based on how that processor will be influenced by the other processors in the path






14. Eight channel digital surround sound system by Dolby






15. Built into DAWs; Bits are added when signals are mixed together to avoid clipping






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






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






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






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






20. A frequency specified for a filter (digital or electronic) the marks the point at which the frequency content of a signal is altered +/- 3dB






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






22. MPEG; Standardizing body of audio coding






23. 12cm plastic disc; 1.2mm thick; One- sided; Red Laser; 1.6 microns between tracks; 125 nanometer pits






24. Deviation from a normal - steady pulse or tick of a clock that contributes to misrepresentation of a signal; Result of small timing irregularities that become magnified during the transmission of digital signals as the signals are passed from one dev






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






26. 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






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






28. 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






29. Single- pin RCA cable or fiber- optic TOSLINK connector used for digital transfer; 75O coaxial - 2- channel unbalanced; 'Consumer' format of AES3






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






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






32. The more bits allocated during quantization - the more accurate the measurement






33. 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






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






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






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






37. 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






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






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






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






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






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






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






44. 15.9 GB; DS/DL






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






46. 'Capturing' part of digital audio; Never captures a signal perfectly






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






48. The amount of energy at each wavelength






49. Used as the main disc from which other discs are made; Composed of ground glass with a very fine photoresistor layer; An imaging laser burns pit and land patterns in preparation for duplication






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