Signal transmission apparatus and signal transmission method

Telecommunications – Transmitter – Amplitude modulation

Reexamination Certificate

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Details

C455S114200, C455S127500, C375S300000

Reexamination Certificate

active

07937048

ABSTRACT:
A signal transmission apparatus of the invention comprises: a correlator12for shaping a spectrum of a signal; and a precoder12disposed on a previous stage of the correlator and including an adder which subtracts an output signal of a feedback filter from an input signal, a modulo arithmetic unit which inputs an output signal of the adder and executes modulo arithmetic operation, and the feedback filter which inputs an output signal of the modulo arithmetic unit and is provided with a transfer function obtained by subtracting 1 from a transfer function of the correlator. The correlator may be IIR filter means having a desired notch characteristic. By disposing a correlator which can freely shape a transmission signal spectrum containing a deep notch and suppress only a specified band on a receiving side, the suppression of an external noise can also be realized.

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