Telecommunications – Transmitter – With feedback of modulated output signal
Reexamination Certificate
2004-07-21
2008-05-27
Urban, Edward F. (Department: 2618)
Telecommunications
Transmitter
With feedback of modulated output signal
C455S127100, C455S114200, C455S114300, C455S125000, C455S115100, C375S296000, C375S297000, C330S149000
Reexamination Certificate
active
07379715
ABSTRACT:
A transmitting apparatus includes a polar signal producing circuit which produces signals corresponding to the amplitude and the phase of a transmitting modulated wave from an input signal and multiplies the amplitude signal by the phase signal by a multiplying circuit to amplitude modulate a phase-modulated wave to produce a transmitting modulated wave and radiates this transmitting modulated wave as radio wave from an antenna. An amplitude/phase detecting circuit detects an amplitude signal and a phase signal from the input of the multiplying circuit and the input of a phase-modulated signal producing circuit. A delay difference computing circuit computes a correlation function between the amplitude signal produced by the polar signal producing circuit and the amplitude signal detected by the amplitude/phase detecting circuit and a correlation function between the phase signal produced by the polar signal producing means and the phase signal detected by the amplitude/phase detecting means, and computes a delay difference between the amplitude signal and the phase signal from maximum values of the respective correlation functions. Then, a timing adjusting circuit adjusts the delay time between the amplitude signal and the phase signal on the base of the computed delay difference.
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Arayashiki Mamoru
Udagawa Masaharu
Hu RuiMeng
Pearne & Gordon LLP
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