(19)
(11) EP 2 061 154 A8

(12) CORRECTED EUROPEAN PATENT APPLICATION
Note: Bibliography reflects the latest situation

(15) Correction information:
Corrected version no 1 (W1 A1)

(48) Corrigendum issued on:
30.09.2009 Bulletin 2009/40

(43) Date of publication:
20.05.2009 Bulletin 2009/21

(21) Application number: 07120789.8

(22) Date of filing: 15.11.2007
(51) International Patent Classification (IPC): 
H04B 1/12(2006.01)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR
Designated Extension States:
AL BA HR MK RS

(71) Applicants:
  • AISIN SEIKI KABUSHIKI KAISHA
    Kariya-shi, Aichi-ken 448-0032 (JP)

    GB FR DE 
  • IMRA Europe S.A.S.
    06904 Sophia Antipolis Cedex (FR)

    FR 

(72) Inventors:
  • Yamamoto, Tomohiro
    Kariya-shi Aichi 448-8650 (JP)
  • Furuhashi, Akira
    Kariya-shi Aichi 448-8650 (JP)
  • Horie, Takahiro
    Kariya-shi Aichi 448-8650 (JP)
  • Murukami, Yuichi
    Kariya-shi Aichi 448-8650 (JP)
  • Ono, Kazunori
    Kariya-shi Aichi 448-8605 (JP)
  • Coutant, Frederic
    06904, Sophia Antipolis Cedex (FR)
  • Aouine, Tarik
    06904, Sophia Antipolis Cedex (FR)

(74) Representative: Pautex Schneider, Nicole Véronique et al
Novagraaf International SA 25, avenue du Pailly
1220 Les Avanchets - Geneva
1220 Les Avanchets - Geneva (CH)

 
Remarks:
Amended claims in accordance with Rule 137(2) EPC.
 


(54) Apparatus for stopping adaptive filtering when valid received signal detected


(57) A digital signal receiving apparatus includes a detection-judging portion (19) having a first smoothing filter (19a) generating a first smoothed signal (A1(t)) by smoothing an auto-correlation signal (X(t)) and judging a possible presence of a desired signal when a signal level of the first smoothed signal (A1(t)) is greater than a reference level (A2(t)) and an absence of the desired signal when being smaller than the reference level (A2(t)). The smoothing filter(19a) includes a limiting portion (24) limiting a fluctuation width of the first smoothed signal (A1(t)); and an adjusting portion (21) configure to adjust the fluctuation width of the first smoothed signal (A1(t)) limited by the limiting portion (24) to be reduced while an relapsing time after the detection-judging means (19) judges the possible presence of the desired signal is increasing.