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






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






3. 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






4. 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






5. Sample Rate x Bit Depth x # of Channels






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






7. Digital and analog processing capability is combined on a single microchip allowing for 1- bit resolution at high sample rates






8. 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






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






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






11. VBR; Most common & best data reduction technique; Codecs that encode data by determining how dense or sparse areas of the audio are; Can result in buffering issues






12. Mixing data and control characters in a single operation






13. 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






14. 7.95 GB; SS/DL






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






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






17. 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






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






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






20. 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






21. Same as 'aliasing'






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






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






24. 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






25. 1st commercially successful AoE format for the transmission of digital audio - video - and control signals over 64- channel 100Mbps Ethernet networks






26. The difference between the analog value and the approximated digital value due to the 'rounding' that occurs while converting the analog signal to digital






27. Reference voltage determined by summing the voltage values of a predetermined number of previous samples; Numbers of 1 in row = waveform peak; Numbers of 0 in row = waveform trough; Basis of Sony's Direct Stream Digital (DSD)






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






29. (Time Based) Frequency: Aliasing; Anti-Aliasing Filter; Sample Rate; Nyquist Limit






30. 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






31. Pertaining to hearing or sound; Combination of the intensity of air pressure molecules with amplitude






32. 15.9 GB; DS/DL






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






35. Allowance of noise floor below that which is required for the final product






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






37. 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






38. The difference in volume between the loudest and quietest sounds of a source






39. Circuit that seizes voltage values with each tick of an A/D device's internal clock






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






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






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






44. EBU






45. 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






46. Computer program or device capable of encoding and/or decoding a digital data stream with the end result being a reduced file size






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






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






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






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