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View Diary: Overnight News Digest 10/18/2013 (42 comments)

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  •  type modulation for sound of TV (6+ / 0-)

    I don't have 'in the clear' satellite broadcast but occasionally I do have find unscrambled audio on my TV headphones ; on the 16th my headphones (on) with the TV off, heard a conference call about 'dark holes' and particles;

    http://wiki.answers.com/...

    Type of Analog Modulation used for Sound in TV?

    In: Cable Television, Satellite Television, HDTV

    Answer:

    In standard analog NTSC (North American) TV, the aural carrier is placed 4.5 MHz above the vestigial visual carrier ... which I think corresponds to 0.75 MHz from the top edge of the RF channel but I'm not sure now.

    The aural carrier is plain old FM modulated, exactly like the familiar FM radio at 88 - 108 MHz,except that its peak deviation is 25 KHz instead of 75 KHz ... or about 9.5 dB less audio out of an identical detector.

    We’re enablers. We’ve become enablers. We can’t be that anymore. ~ Minority Leader Nancy Pelosi, D-CA

    by anyname on Fri Oct 18, 2013 at 09:47:46 PM PDT

    [ Parent ]

    •  5MHz > 40GHz (6+ / 0-)

      http://wiki.answers.com/...

      What is the frequency range of optical fiber?

      40 GHz

      In: Electronics Engineering

      What is the frequency of a video frequency oscillator?

      5MHz

      In: Satellite Television | Electronics Engineering | Radio | Waves Vibrations and Oscillations

      We’re enablers. We’ve become enablers. We can’t be that anymore. ~ Minority Leader Nancy Pelosi, D-CA

      by anyname on Fri Oct 18, 2013 at 09:49:12 PM PDT

      [ Parent ]

      •  dielectric (6+ / 0-)

        http://en.wikipedia.org/...

        artificial dielectrics

        http://en.wikipedia.org/...

        dielectrics

        http://en.wikipedia.org/..._(electrical)

        insulator

        The term insulator is generally used to indicate electrical obstruction while the term dielectric is used to indicate the energy storing capacity of the material (by means of polarization).

        http://en.wikipedia.org/...
        capacitor

        Capacitors are widely used in electronic circuits for blocking direct current while allowing alternating current to pass

        http://dictionary.die.net/...
        Source: WordNet (r) 1.7

        dielectric
             n : a material such as glass or porcelain with negligible
                 electrical or thermal conductivity [syn: insulator, nonconductor]
                 [ant: conductor]

        Source: Webster's Revised Unabridged Dictionary (1913)

        Dielectric Di`e*lec"tric, n. [Pref. dia- + electric.] (Elec.)
           Any substance or medium that transmits the electric force by
           a process different from conduction, as in the phenomena of
           induction; a nonconductor. separating a body electrified by
           induction, from the electrifying body.

        materials, which interact at radio frequency, microwave and later, optical frequencies

        http://www.nae.edu/...
        Optical Antennas: A New Technology that can Enhance Light-Matter Interactions

        Antennas in the optical range will improve the efficiency of light-emitting devices.

        The purpose of optical antennas is to convert the energy of free propagating radiation to localized energy, and vice versa.

        Although this is similar to what radio wave and microwave antennas do, optical antennas exploit the unique properties of metal nanostructures, which behave as strongly coupled plasmas at optical frequencies.

        It is hoped that optical antennas can increase the efficiency of light-matter interactions in important applications, such as light-emitting devices, photovoltaics, and spectroscopy.

        http://www.answers.com/...

        optic frequency

        (physics) A frequency comparable to that of electromagnetic waves in the optical region, above about 3 × 1011 hertz.
        Read more: http://www.answers.com/...
        What is the frequency in a frequency table?

        Answer:

        The frequency in a frequency table is the number of occurrences within each class width. The total frequency is the sum of all frequency's within all the classes.

        We’re enablers. We’ve become enablers. We can’t be that anymore. ~ Minority Leader Nancy Pelosi, D-CA

        by anyname on Fri Oct 18, 2013 at 09:52:20 PM PDT

        [ Parent ]

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