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






2. Perceptual coding technique that uses louder sounds of a similar frequency to decide what information is to be saved during data reduction






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






4. 1.) Bit Rate x Sample Rate (you'll get b/sec) 2.) Multiply by 60 if converting seconds to minutes 3.) Divide by 8 to convert bits to Bytes and get B/min 4.) Divide by 1 -024 to get KB/min and keep doing it until you get desired bit rate specification






5. 1st commercially successful AoE format for the transmission of digital audio - video - and control signals over 64- channel 100Mbps Ethernet networks






6. 8.75 GB; DS/SL






7. Describes acceptable data - performances both offered and essential for a disc player - and the complete user experience






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






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






10. 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






11. 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






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






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






14. 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






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






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






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






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






20. AAC (Advanced Audio Coding); MP3; RA; WMA; OGG Vorbis; Dolby Digital/AC-3; DTS; ADPCM






21. 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






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






23. Data is transmitted over fiber optic lines; Uses a TOSLINK connecter instead of an RCA type; Can transmit multi- channel audio; Not susceptible to ground hum and loops; Able to support far higher rates of data transfer over greater distances than coa






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






25. Toshiba developed digital audio interface utilizes fiber optics as a transmission medium.






26. The frequency range that is allowed through a filter






27. Data reduction technique that does not effect quality of original audio; No effect on original quality; Typically around 50% reduction; Exact reconstruction of digital code for the audio signal






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






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






30. Occurs as data is assembled into meaningful bits or information and as left & right channels are separated






31. 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






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






33. 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






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






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






36. 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






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






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






39. Eight channel digital surround sound system by Dolby






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






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






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






43. 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






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






45. Mixing data and control characters in a single operation






46. AES






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






48. MPEG; Standardizing body of audio coding






49. Roughly around 1 -130 ft/s






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