Signal generating apparatus

Details Signal generating apparatus Signal generating apparatus

1993-10-29

1996-02-27

Chin, Stephen

Pulse or digital communications

Systems using alternating or pulsating current

Angle modulation

375285, 375308, 332103, H04L 2710

Patent

active

054955041

ABSTRACT:
A signal generating apparatus comprises a mapping circuit for converting a time-sequential input signal into I and Q signals constituting a QPSK code, a signal holding circuit for dividing each of I and Q signals into a plurality of digital signals, retaining them, and outputting them in parallel, a waveform forming circuit for outputting waveform data items corresponding to the plurality of digital signals from the signal holding circuit, a D/A converter for converting the waveform data items from the waveform forming circuit into a plurality of analog signals, an adder for adding the plurality of analog signals from the D/A converter and outputting a sum signal, and a filter for eliminating unwanted frequency components from the sum signal from the adder.

REFERENCES:
patent: 4613976 (1986-09-01), Sewerinson et al.
patent: 4962510 (1990-10-01), McDavid et al.
patent: 5225795 (1993-07-01), Iinuma
patent: 5255288 (1993-10-01), Ichihara
patent: 5303412 (1994-04-01), Kushner

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