Midlevel carrier modulation and demodulation techniques

Details Midlevel carrier modulation and demodulation techniques Midlevel carrier modulation and demodulation techniques

1986-09-22

1991-01-29

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375 52, 375 83, 375 95, 375121, 332115, 329363, H04L 2702

Patent

active

049892193

ABSTRACT:
Several techniques are disclosed for producing modulation of a carrier signal wherein each transition of the modulated carrier signal includes a midrange level and/or two midrange characteristics, the level and/or ratio of the two midrange characteristics representing data carried by that transition. A simplified method over that disclosed in parent application Ser. No. 590,281, filed Mar. 16, 1984 now U.S. Pat. No. 4,613,974 is disclosed herein, and is referred to as a "flipped sine wave" method of producing the modulated carrier signal. Another technique, referred to as a "third harmonic modulation" technique uses the phase relationship between a fundamental and its third harmonic to produce the modulated carrier signal. A technique for storing the modulated carrier on magnetic media and correcting for offset resulting therefrom or from attenuation and advance of the third harmonic relative to the fundamental to permit accurate demodulation is disclosed.

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"Combination Leading and Trailing Edge Variable Slope Pulse Modulation", by O. E. Kruse, D. L. Lewis, & J. K. Jackson, Electronic Engineering, Mar. 1967, pp. 174-176.

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