Frequency spectrum analyzing apparatus and transmitter character

Details Frequency spectrum analyzing apparatus and transmitter character Frequency spectrum analyzing apparatus and transmitter character

1996-03-05

1998-01-06

Voeltz, Emanuel T.

Boots, shoes, and leggings

364484, 364576, 364726, 324 7619, 324 7621, 324 7643, 324 7645, G01R 2316

Patent

active

057062021

ABSTRACT:
In a frequency spectrum analyzing apparatus which utilizes a DFT (discrete Fourier transform) filter bank, and can detect the peak value of the amplitude of an input signal, a time sequence signal generation circuit samples an input signal to convert it into a time sequence signal. A memory stores the time sequence signal. The DFT filter bank receives a time sequence signal read out from the memory by a control device, and performs DFT filter bank processing corresponding to a plurality of desired frequencies while shifting a window function by a predetermined number of sample point units. An absolute value calculation unit calculates absolute values in units of outputs from the DFT filter bank. A peak value detection unit detects peak values in units of outputs from the absolute value calculation unit. A display device displays the frequency spectrum on the basis of these peak values.

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patent: 5475709 (1995-12-01), Futagami et al.
patent: 5563909 (1996-10-01), Nakazawa
H. Yanagawa et al; Anritsu Technical Bulletin No. 66, Sep., 1993; pp. 74-84. (Only some portions translated).
K. Nakatsugawa et al; Anritsu Technical Bulletin No. 51, Mar. 1986; pp.52-57. (Only some portions translated).
R. Crochiere et al; "Multirate Digital Signal Processing"; 1983 by Prentice-Hall, Inc., pp. 303-325.
Japan, Zaidanhoujin Musen-setsubi-kensa-kentei-kyokai (also called MKK), i.e. foundation of Radio-Equipment-Inspection-Authorization-Association in Japan, Technical Standard Matching Approval "Characteristics Test Method (Part 2) of Radio Equipment"; pp. 51-52, Jul. 1993. (no translation).

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