Global Patent Index - EP 0902895 A4

EP 0902895 A4 2000-08-16 - INTERFEROMETRIC SIGNAL PROCESSING APPARATUS

Title (en)

INTERFEROMETRIC SIGNAL PROCESSING APPARATUS

Title (de)

INTERFEROMETRISCHE SIGNALVERARBEITUNGSVORRICHTUNG

Title (fr)

APPAREIL DE TRAITEMENT INTERFEROMETRIQUE DU SIGNAL

Publication

EP 0902895 A4 (EN)

Application

EP 97923665 A

Priority

  • AU 9700345 W
  • AU PO024296 A

Abstract (en)

[origin: WO9746890A1] An interferometric signal processing apparatus (10) producing an output signal from a first input signal (34) and a second input signal (34), said input signals (34) having substantially equal carrier frequencies, comprising: a bridge (12) having a first arm (26) and a second arm (28), each arm having a first end (30) and a second end (32), the first and second input signals (34) being input to the first end (30) of the first and second arms (26, 28), respectively; a device-under-test (36) provided the first arm (26); a carrier suppression means (14) connected to the second ends (32) of the first and second arms (26, 28) to produce a carrier-suppressed signal at its output (A); an amplifier (16) arranged to amplify said carrier-suppressed signal; and a mixing means (22, 24) responsive to the amplified carrier-suppressed signal and a carrier-dominated signal to produce the output signal; wherein the differential group delay between: the first end (30) of the first arm (26) and the output (A) of the carrier suppression means (14); and the first end (30) of the second arm (28) and the output (A) of the carrier suppression means (14) is less than or equal to 1000/fo seconds, where fo is the time-averaged mean value of the carrier frequencies of the input signals (34).

IPC 1-7 (main, further and additional classification)

G01R 17/00; G01B 9/02

IPC 8 full level (invention and additional information)

G01B 9/02 (2006.01); G01R 27/28 (2006.01); H03D 9/04 (2006.01)

CPC (invention and additional information)

H03D 9/04 (2013.01); G01R 27/28 (2013.01)

Citation (search report)

Designated contracting state (EPC)

AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

EPO simple patent family

WO 9746890 A1 19971211; AU 2944297 A 19980105; AU 736234 B2 20010726; AU PO024296 D0 19960627; CA 2256717 A1 19971211; EP 0902895 A1 19990324; EP 0902895 A4 20000816; JP 2000512010 A 20000912

INPADOC legal status


2005-08-10 [18R] REFUSED

- Effective date: 20050317

2003-07-23 [17Q] FIRST EXAMINATION REPORT

- Effective date: 20030610

2000-08-16 [A4] SUPPLEMENTARY SEARCH REPORT

- Effective date: 20000629

2000-08-16 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A4

- Designated State(s): AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

1999-03-24 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 19981224

1999-03-24 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE