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. 1.) Taking a series of evenly- spaced measurements 2.) Signal contains no frequency components higher than half the sample rate






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






3. 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'






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






5. 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






6. Softest sound that can be heard by the average human ear (0 dB)






7. The frequency range that is allowed through a filter






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. Six channel (five speakers and one subwoofer for bass) digital surround sound system by Dolby






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






11. 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






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






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






14. 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






15. A method of representing real numbers using a mantissa and an exponent






16. Eight channel digital surround sound system by Dolby






17. Governs the frequency response of a digital system; The highest- frequency component that can be captured with a sampling rate; always 1/2 of sampling rate; Also called the limiting frequency






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






19. MPEG; Standardizing body of audio coding






20. The loudest point of a Full Scale system






21. Industry Standards: -6 dB Peak = -20 RMS Meter






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






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






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






25. Allows for an internal sample rate at multiples of the input and output rates; Alleviates the need for steep 'brickwall' filters; Often combined with internal '1- bit' processing; Increases smoothing effect






26. 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






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






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






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






30. 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);






31. 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






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






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






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






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






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






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






38. Process that begins with a fast FFT analysis of the spectra of two input signals - then the multiplication of like frequencies - and IFFT to finalize the process






39. 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






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






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






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






43. 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.






44. 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






45. EBU






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






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






48. 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






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






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