Digital Audio
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Digital Audio
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25 Questions

1. Subtract place values from the decimal number and place ones or zeros in the correct places

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

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

4. Serial Copy Management System; main difference between AES3 & S/PIDF

5. 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

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

7. Also known as equal loudness curves; Graph that indicates the average ear sensitivity to different frequencies at different SPL levels (as volume increases - these curves flatten out)

8. Based on psychoacoustics - these are the basis of frequency analysis for a perceptual codec;

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

10. Built into DAWs; Bits are added when signals are mixed together to avoid clipping

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

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

13. 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

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

15. 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

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

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

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

19. Unit of measurement that is equal to one millionth of a meter

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

21. 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

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

23. 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

24. 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

25. Signal voltage is relayed to a register from sample- and - hold circuit; Holds reference frequencies in binary form that decrease in value; Finds approximated value & assigns binary number accordingly

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