DIGITAL PHASE SHIFTER - YOKOGAWA MEDICAL SYST

Title:

DIGITAL PHASE SHIFTER

Document Type and Number:

WIPO Patent Application WO/1993/013710

Kind Code:

A1

Abstract:

A digital phase shifter capable of shifting the phases of data row by steps shorter than the sampling period even though the sampling signal the phase of which is fixed or a clock signal is used. This phase shifter comprises: a memory for storing consecutively time series data sampled at given periods in addresses corresponding to the sampling times; reading means for reading from this memory consecutively the data at sampling times earlier than the current sampling time by a desired period of time in synchronism with the sampling of the time series data; a register for holding several consecutive pieces of data including the latest one with respect to those read from the memory; and means for generating interpolated data in desired divided positions at the sampling intervals of a plurality of pieces of data held in this register by adding weights to the plural pieces of data held in it.

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Inventors:

AMEMIYA SHINICHI (JP)
SUZUKI YOICHI (JP)

Application Number:

PCT/JP1993/000042

Publication Date:

July 22, 1993

Filing Date:

January 13, 1993

Export Citation:

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Assignee:

YOKOGAWA MEDICAL SYST (JP)

International Classes:

A61B8/00; G01N29/44; G01S7/52; H03H11/16; H03H17/08; (IPC1-7): A61B8/00

Foreign References:

JPS6175685A	1986-04-18
JPS63222745A	1988-09-16
JPS6476839A	1989-03-22

Other References: