Title:
MIXED AREA MEASURING METHOD
Document Type and Number:
Japanese Patent JP2988750
Kind Code:
B2
Abstract:
PURPOSE: To make sampling frequency changeable by a large margin while the cut-off frequency of an aliasing preventing filter is as it is fixed at the time of measuring a transfer function or the like between a digital signal system and an analog signal system.
CONSTITUTION: At the time of measuring a transfer function of an analog circuit 28, frequency Fsa for sampling its analog output is made higher than sampling frequency Fsd of a digital system. When the cut-off frequency of an aliasing preventing filter 30 is made FLP, and frequency to be observed is made 0-Fspan, the frequency ratio of a left side is set in such a way as to obtain Fsa/Fsd≥(Fspan+FLP)/Fsdo. A measured result uninfluenced by aliasing is thereby obtained.
More Like This:
Inventors:
DAGURASU AARU WAGUNA
Application Number:
JP19848091A
Publication Date:
December 13, 1999
Filing Date:
July 12, 1991
Export Citation:
Assignee:
HEWLETT PACKARD CO
International Classes:
G01R23/16; G01R27/28; G01R31/316; (IPC1-7): G01R27/28
Domestic Patent References:
| JP5455482A | ||||
| JP5364536A |
Attorney, Agent or Firm:
Hideo Ueno
Previous Patent: PRODUCTION OF ZINC ORTHOSILICATE PRECURSOR AND PRODUCTION OF ZINC ORTHOSILICATE
Next Patent: FILM FOR ORNAMENTATION
Next Patent: FILM FOR ORNAMENTATION