Adaptive interpolation

a technology of real-time oscilloscope and interpolation, applied in the field of real-time oscilloscope, can solve the problems of truncated sinc filter failing to reject an undesired frequency, affecting the use of the maximum theoretical available bandwidth,

a technology of real-time oscilloscope and interpolation, applied in the field of real-time oscilloscope, can solve the problems of truncated sinc filter failing to reject an undesired frequency, affecting the use of the maximum theoretical available bandwidth,

US20070273567A1Active Publication Date: 2007-11-29TELEDYNE LECROY
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0035]FIG. 8 is a flowchart diagram detailing the preferred functioning of a HF adaptive upsample filter (block 80 of FIG. 11);

[0036]FIG. 9 is a graphical representation of an impulse response during various steps of a time-domain calibration process in the simplified case of flat group delay and the appearance of a brief impulse, such as the calibration pulse itself, on the instrument calibrated in accordance with an embodiment of the present invention;

[0037]FIG. 10 is a block diagram depicting various hardware elements of the DSO in the preferred embodiment of the present invention;

[0038]FIG. 11 is a block diagram depicting various software elements in accordance with a preferred embodiment of the present invention;

[0039]FIG. 12 is a block diagram showing how the inputs and DBI hardware outputs are connected to the scope front-end in accordance with a preferred embodiment of the present invention;

[0040]FIG. 13 depicts the desired arrangement of the bands and LO and sampling c...

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Abstract

A method and apparatus for acquiring an analog signal. The method of the invention comprising the steps of acquiring a first portion of the analog signal by a first channel, the first portion of the analog signal spanning a first bandwidth range, and acquiring a second portion of the analog signal by a second channel, the second portion of the analog signal spanning a second bandwidth range adjacent the first bandwidth range. At least one spur in the signal acquired by the first channel corresponding to a portion of the analog signal that should have properly been acquired by the second channel is offset with an opposite spur in the second channel.

Description

BACKGROUND OF THE INVENTION [0001] The present invention is directed to real time oscilloscopes, and more particularly to real time oscilloscopes employing a bandwidth extension scheme (i.e. Digital Bandwidth Interleaving), such as that described in U.S. patent application Ser. No. 11 / 281,075, titled HIGH BANDWIDTH OSCILLOSCOPE, filed Nov. 17, 2005 (“the '075 application”), currently pending, the entire contents thereof being incorporated herein by reference. In accordance with the disclosure of this pending patent application, each of a plurality of channels (two, for example, which will be referred to as LF (low frequency) and HF (high frequency)) receive a portion of an input signal corresponding to a specific frequency band. As described in the above application, additional processing is performed on this split signal for acquiring and digitizing the signal. In accordance with the present invention, further modification to this process of the '075 application is presented. [0002...

Claims

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Application Information

Patent Timeline
29 Nov 2007
Publication
US20070273567A1
IPC
H03M1/66
CPC
G01R13/0272
Inventors
LAMARCHE, FRANCOIS