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Data processing method for spectrum analyzer

A spectrum data and data processing technology, applied in the field of data processing, can solve problems such as inability to ensure the compatibility of swept spectrum analyzers

Active Publication Date: 2007-03-21
TEKTRONIX INC
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under limited measurement conditions, no FFT-based spectrum analyzer (or signal analyzer) can replace a swept spectrum analyzer because, since the FFT-based spectrum analyzer has no video filter, the FFT-based Spectrum analyzers cannot set VBW, and FFT-based analyzers cannot ensure compatibility with swept spectrum analyzers

Method used

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  • Data processing method for spectrum analyzer
  • Data processing method for spectrum analyzer
  • Data processing method for spectrum analyzer

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Embodiment Construction

[0020] Fig. 3 is a functional block diagram of a signal analyzer according to the present invention, in which blocks corresponding to those of the conventional example are denoted by the same numerals. A control device including a microprocessor, a memory, a hard disk drive, etc. controls the operation of each block according to the settings made by the user through the operation panel. A program for controlling circuit operations may be stored in advance in a storage device such as a hard disk drive or the like.

[0021] The signal analyzer according to the invention differs from the conventional signal analyzer shown in FIG. 2 in that data processing is carried out by means of a digital operation block 46 . 3 and 4 showing a signal analyzer similar to the FFT type signal analyzer shown in FIG. 2, the input variable attenuation circuit 30 adjusts the level of the input signal under test, and the input signal is Provided to mixer 32 and mixed with local signal from local osci...

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Abstract

A data processing method is provided to enable a calculation based signal analyzer, such as an FFT based spectrum analyzer, to produce results corresponding to a swept spectrum analyzer employing a video bandwidth (VBW) filter. Once a spectrum is produced the frequency axis is replace by a corresponding time axis, so that a time domain filter, such as a video bandwidth (VBW) filter can be applied. In a first example, the filter characteristics are applied by performing an FFT on display spectrum data, which has had its frequency axis replaced by a corresponding time axis, produce frequency domain data, multiplying by the frequency response to produce a filtered version, performing an inverse FFT and replacing the time axis with the original frequency axis to produce a filtered version of the display spectrum data. In another example, a filter impulse response is computed based upon the desired filter characteristics, a convolution integral of the display spectrum data, which has had its frequency axis replaced by a corresponding time axis, and the filter impulse response is conducted, and the time axis is replace by the original frequency axis to produce filtered display spectrum data.

Description

technical field [0001] The present invention relates to data processing of signal analyzers using FFT calculations, and more particularly to data processing of signal analyzers for simulating the results to be provided by swept spectrum analyzers using video filters. Background technique [0002] Figure 1 is a block diagram of an example of a swept spectrum analyzer. A control device (not shown) including a microprocessor, a memory, and a hard disk drive etc. controls block operations according to settings made by a user through an operation panel, as is well known in the art. An input variable attenuator 10 adjusts the level of the input signal under test, and a mixer 12 mixes the input signal with a local signal from a swept oscillator 14 . The frequency of the local signal varies according to the scanning signal (ramp waveform) from the scanning signal generator 16 . This processing results in a linear relationship between frequency and time variations on the synthesize...

Claims

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Application Information

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IPC IPC(8): G01R23/165G01R23/16G01R31/00G06F17/00
CPCG01R23/167G01R23/16
Inventor 细井修奈良明
Owner TEKTRONIX INC
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