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






2. 12.33 GB; DS/ML






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






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






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






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






7. 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






8. Full Scale; Type of metering that measures level in digital recording system; Recording and Mixing levels should NEVER exceed 0dB FS in digital audio or clipping will occur






9. 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






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






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






12. 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






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






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






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






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






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






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






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






20. 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






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. 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






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






24. Very selective method of lowering buffer levels by halting different levels of audio processing






25. Anytime bit depth is reduced the gap gets bigger so more dithering is required






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






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






28. Have odd numbered harmonics






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






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






31. 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






32. 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






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






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






35. 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






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






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






38. As sample rate is increased more room is created for a smoother slope of the attenuation band because Nyquist limit extends well beyond range of hearing with each increase






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






40. 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






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






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






43. 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






44. Joint-Stereo Technique; Since the human brain is unable to localize sounds at high frequencies well sounds above 9 kHz threshold are encoded in mono






45. Digital Word -> Series of Resistors (each with assigned charges) -> Sample- and-Hold Circuit -> Anti-Imaging Filter (Smoothing Filter) -> Reconstructed Sample






46. Ratio of magnitude of the analytical signal to the magnitude of the background noise signal






47. Reduces the percieved distortion due to quantization error; Low level white noise source is introduced to make the profile of the quantization 'noise' more irregular; Useful when reducing the number of bits per word in a signal (i.e. when converting






48. 1st commercially successful AoE format for the transmission of digital audio - video - and control signals over 64- channel 100Mbps Ethernet networks






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






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