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1. Near Field Sound
Definition:Typically, any point where the direct sound emission is measurably louder than the reflections of that sound. From a more accurate technical perspective, this is the point where the velocity of molecules emitted by the radiator is out of phase with the sound pressure wave. This is especially obvious when the listener is in close proximity to high frequency emissions.
Submitted on Monday, November 01, 2004 11:58:53 AM

2. Negative feedback:-The dynamic comparison of a fraction of the output signal to the input signal at the input to an amplifier in such a way that the amplifier regulates it's output signal for maximal conformity to the input signal. Negative feedback is frequently used in designing opamp circuits and audio power amplifiers.
Submitted on Friday, September 29, 2006 11:58:53 AM

3. Negative LCD:A liquid crystal display employing a dark backfield with lit elements. This results in a primarily dark display, which improves cosmetic integration with a dark colored headunit.
Submitted on Friday, July 30, 2004 11:58:53 AM

4. Neodymium Magnet:-A magnet material providing 7.5 times the magnetic strength of standard magnetic materials.
Submitted on Wednesday, October 27, 2004 11:58:53 AM

5. Net Volume
Definition:The amount of airspace that is enclosed within a speaker's enclosure. This does not include the airspace taken up by bracing, vents, or the speaker itself.
Submitted on Wednesday, August 18, 2004 11:58:53 AM

6. Noise-An unwanted electrical signal or sound. (e.g., We told Frankie to watch out for that discount amp because it had too much noise.)
Submitted on Wednesday, September 06, 2006 11:58:53 AM

7. Noise:
An unwanted electrical signal or sound. (e.g., We told Frankie to watch out for that discount amp because it had too much noise.)
Submitted on Friday, August 27, 2004 11:58:53 AM

8. Noise
Perceived sounds not in the original soundtrack. Such things as hiss, crackle, pops, hum, and buzz, are typical of the types of extraneous signals described as noise. Inherent noise in the electronic processing in any sytem is measured in decibels relative to the amplitude of the original signal.
Submitted on Friday, June 30, 2006 11:58:53 AM

9. Noise floor
Normally the lowest threshold of useful signal level (although sometimes audible signals below the noise floor may be recovered).
Submitted on Sunday, April 09, 2006 11:58:53 AM

10. Noise gate:An expander with a fixed "infinite" downward expansion ratio. Used extensively for controlling unwanted noise, such as preventing "open" microphones and "hot" instrument pick-ups from introducing extraneous sounds into the system. When the incoming audio signal drops below the user set-point (the threshold point) the expander prevents any further output by reducing the gain to "zero." The actual gain reduction is typically on the order of -80 dB, thus once audio falls below the threshold, effectively the output level becomes the residual noise of the gate. Common terminology refers to the gate "opening" and "closing." Another popular application uses noise gates to enhance musical instrument sounds, especially percussion instruments. Judicious setting of a noise gate's attack (turn-on) and release (turn-off) times adds "punch," or "tightens" the percussive sound, making it more pronounced.
Submitted on Monday, June 12, 2006 11:58:53 AM

11. Noise Reduction (DNR, Dolby B, Dolby C, etc.)
Definition:Various methods or schemes for reducing the level of noise on program material. Note that modern CDs don't require such processing. (e.g., Since most of the old cassettes were recorded with Dolby B noise reduction, you should look for a cassette deck that features Dolby B on playback.)
Submitted on Friday, April 15, 2005 11:58:53 AM

12. Noise Reduction (DNR, Dolby B, Dolby C, etc.)
Various methods or schemes for reducing the level of noise on program material. Note that modern CDs don't require such processing. (e.g., Since most of the old cassettes were recorded with Dolby B noise reduction, you should look for a cassette deck that features Dolby B on playback.)
Submitted on Sunday, April 08, 2007 11:58:53 AM

13. Nominal Impedance
Definition:The minimum impedance a loudspeaker presents to an amplifier, directly related to the power the speaker can extract from the amplifier.
Submitted on Thursday, March 03, 2005 11:58:53 AM

14. Non-Delay Play
Definition:A disc changer feature with significantly reduced silence between the time one disc is finished, and the next disc is loaded and cued.
Submitted on Sunday, March 19, 2006 11:58:53 AM

15. Nonlinearity-What goes into a system comes out changed by its passage through that system-in other words, distorted. The ideal of an audio component and an audio system is to be linear, or nondistorting, with the image on one side of the mirror identical to the image on the other side.
Submitted on Friday, December 02, 2005 11:58:53 AM

16. Non-Lossy Compression:A form of data compression which seeks out chunks of data which are identical, replacing them with markers called keys. In this way, the file is reduced in size, and when it is decompressed by the recipient, the keys are replaced with the large chunks of data that were originally there (this is called Run Length Encoding). Using non-lossy compression, the uncompressed file is identical to the original file.
Submitted on Tuesday, January 10, 2006 11:58:53 AM

17. Normal home or office background
Definition:40-60 dB
Submitted on Monday, October 23, 2006 11:58:53 AM

18. Normal speaking voice-65-70 dB
Submitted on Friday, December 23, 2005 11:58:53 AM

19. Notch filter
A special type of cut-only equalizer used to attenuate ( no boosting ) a narrow band of frequencies. Three controls
Submitted on Friday, July 21, 2006 11:58:53 AM

20. NTSC:
National Television System Committee. Refers to the standards used for video broadcast and playback signal parameters in the U.S. Japan and other countries. Alternative systems used in Europe and some Asian countries are PAL and SECAM.
Submitted on Thursday, October 19, 2006 11:58:53 AM

21. Nyquist's Theorem
Definition:This states that a sound must be sampled at at least twice its highest analog frequency in order to extract all of the information from the bandwidth and accurately represent the original acoustic energy. In practice, sampling at slightly more than twice the frequency will make up for imprecisions in filters and other components used for the conversion.
Submitted on Thursday, June 08, 2006 11:58:53 AM

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