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






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






3. 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.






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






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






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






7. Branch of psychology concerned with the subjective perception of sound






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






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






10. Based on Full Scale (dB/FS); -6dB represents a loss of one bit so account for this when calculating






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






12. 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






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






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






15. 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






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






17. Method of sampling data at a higher resolution (higher sample rate) as a means of reducing harmonic content during D/A conversion; (x2) oversampling gets rid of all odd harmonic content






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






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






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






21. 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






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






23. 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






24. 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






25. 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






26. 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






27. 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






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






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






30. The process of reducing the space required to store data by efficiently encoding the content.






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






32. Root Mean Square; Refers to taking the square root of all instantaneous amplitudes; Takes the average of those squares; (-6 Peak Level is approximately equal to -20 RMS)






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






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






35. Waveform of a pure tone showing simple harmonic motion






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






37. MPEG; Standardizing body of audio coding






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






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






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






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






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






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






44. 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






45. Father of modern information theory; Solidified the Nyquist Theory by adding the concept that bits per second (binary representation of audio signals) must be at equal intervals to accurately represent data






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






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






48. Eight channel digital surround sound system by Dolby






49. Level above which audible sounds are painful (125 - 130 db)






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