Pulse or digital communications – Repeaters – Testing
Patent
1980-05-12
1982-02-23
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
364485, 455 67, H03K 1332, H04Q 120
Patent
active
043172067
ABSTRACT:
A system for on-line detection of distortion in a received digital signal which is phase modulated at a data rate f.sub.d and which has a suppressed carrier frequency f.sub.c and without interrupting the signal. The system comprises means for multiplying a received digital signal by itself N times to produce a resultant signal comprising a reconstructed carrier signal of frequency Nf.sub.c and phase .phi..sub.1 and distortion produced upper and lower sidebands of frequencies f.sub.u =Nf.sub.c +f.sub.d and f.sub.l =Nf.sub.c -f.sub.d and also means for generating I and Q signals of frequency Nf.sub.c and of phase .phi..sub.1 and .phi..sub.1 .+-.90.degree., respectively. Further provided are means for generating a clock signal of frequency f.sub.d and a control means for mixing said I and Q signals with said clock signal to produce I/D and Q/D signals, respectively, where I/D represents the product of the I signal and said clock signal f.sub.d and Q/D represents the product of the Q signal and said clock signal D of frequency f.sub. d. The control means is further constructed to independently mix said I signal, said I/D signal, and said Q/D signal with said first signal to produce d.c. voltages which define the distortion in the received digital signal.
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Cohen Samuel
Phillion Donald W.
RCA Corporation
Safourek Benedict V.
Troike Robert L.
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