System for signal path characterization with a reference signal

Details System for signal path characterization with a reference signal System for signal path characterization with a reference signal

1998-11-07

2000-10-31

Metjahic, Safet

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Parameter related to the reproduction or fidelity of a...

324626, 324627, G01R 2700

Patent

active

061408220

ABSTRACT:
A system that utilizes a reference signal for testing signal paths for complex frequency response (linear distortion), and non-linear distortion. This reference signal, which is also known as a ghost canceling reference signal or a training waveform, has excellent properties for channel characterization. The reference signal is a waveform that operates for a major time interval that is subdivided into multiple minor time intervals. During each minor time interval, a sine wave oscillates at a constant angular velocity or frequency. The sine wave frequency may take uniform steps between the minor time intervals, or it may skip a group of frequencies. The phase of the waveform may optionally be continuous between the end of one minor time interval and the start of the next minor time interval. This waveform is generated by loading the time sample values from a digital memory into a digital to analog converter (D-A), or by rapidly reprogramming a numerically-controlled oscillator. The reference signal can also be analyzed for the presence of non-linear distortion. Broadband RF channels, such as cable television channels, or baseband channels, such as telephone channels may be characterized using this waveform.

REFERENCES:
patent: 4344028 (1982-08-01), Bank et al.
patent: 5066921 (1991-11-01), Rope et al.
patent: 5121211 (1992-06-01), Koo
patent: 5179444 (1993-01-01), Koo
patent: 5510700 (1996-04-01), Pomatto
Proofing and Maintaining Upstream Cable Plant with Digital Signal Analysis Techniques, by Thomas H. Williams, 49th ARFTG Conference Digest, Spring 97 Analog Devices AD9850 Data Sheet, 1996 No Month Available.
Testing Coaxial Shielding Integrity by Sheath Current Induction by Tom Williams and David Bell SCTE Cable Tech Expo 1998 Proceedings Manual (Jun. 1998).
Product Literature from Microwave & RF Magazine Sep. 1998, p. 166.
Product Literature Downloaded from the Stanford Telecom Internet Site (www) on Nov. 10, 1998 2 pages.

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