definition:Heterodyne

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In radio and signal processing, heterodyning is the generation of new frequencies by mixing, or multiplying, two oscillating waveforms. It is useful for modulation and demodulation of signals, or placing information of interest into a useful frequency range. This operation may be accomplished by a vacuum tube, transistor, or other signal processing device. Mixing two frequencies creates two new frequencies, according to the properties of the sine function: one at the sum of the two frequencies mixed, and the other at their difference. Typically only one of these frequencies is desired—the higher one after modulation and the lower one after demodulation. The other signal is either not passed by the tuned circuitry that follows, or may be filtered out.


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This entry was written by enjoying autumn, posted on January 16, 2009 at 11:35 pm.

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  1. Timothy Obama
    Posted January 16, 2009 at 11:36 pm | Permalink

    The cocktail party effect describes the ability to focus one’s listening attention on a single talker among a mixture of conversations and background noises, ignoring other conversations.[1] This effect reveals one of the surprising abilities of our auditory system, which enables us to talk in a noisy place.

    The cocktail party effect can occur both when we are paying attention to one of the sounds around us and when it is invoked by a stimulus which grabs our attention suddenly.

    http://en.wikipedia.org/wiki/Cocktail_party_effect

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