Apparatus for stopping adaptive filtering when valid received signal detected and for limiting signal to be demodulated

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EP 2 061 153 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:
	19.08.2009 Bulletin 2009/34

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

(21)	Application number: 07120783.1

(22)	Date of filing: 15.11.2007

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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 448-8650 (JP) DE GB FR 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 and for limiting signal to be demodulated

(57) A digital signal receiving apparatus includes: detection-judging portion (19) judging a possible presence of a desired signal when a signal level of a smoothed signal (A1(t)) is greater than a reference level (A2(t)); a filter controlling portion (20) switching an adaptive filter (16) from an adaptive mode to a non-adaptive mode when the detection-judging portion (19) judges the possible presence of the desired signal and switching from the non-adaptive mode to the adaptive mode when the detection judging portion (19) judges the absence of the desired signal; a limiting portion (18a) limiting a signal level of an auto-correlation signal (X(t)) to the signal level of the smoothed signal (A1(t)); and a demodulating portion (18b) demodulating the auto-correlation signal (X(t)) having the signal level limited by the limiting means so as to generate a demodulated signal.