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Machine translation
1. (WO2000028667) METHOD AND DEVICE FOR MAXIMIZING THE RATIO BETWEEN SIGNAL AND QUANTIZATION NOISE WHEN CONVERTING BETWEEN ANALOGUE AND DIGITAL FORM OF A MULTI-CARRIER SIGNAL
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/2000/028667    International Application No.:    PCT/SE1999/001974
Publication Date: 18.05.2000 International Filing Date: 03.11.1999
Chapter 2 Demand Filed:    04.05.2000    
IPC:
H03M 1/08 (2006.01), H03M 1/12 (2006.01)
Applicants: TELEFONAKTIEBOLAGET LM ERICSSON [SE/SE]; S-126 25 Stockholm (SE)
Inventors: WENGER, Fabian; (SE)
Agent: ANDERSSON, Per; Albihns Patentbyrå Göteborg AB P.O. Box 142 S-401 22 Göteborg (SE)
Priority Data:
9803856-5 11.11.1998 SE
Title (EN) METHOD AND DEVICE FOR MAXIMIZING THE RATIO BETWEEN SIGNAL AND QUANTIZATION NOISE WHEN CONVERTING BETWEEN ANALOGUE AND DIGITAL FORM OF A MULTI-CARRIER SIGNAL
(FR) PROCEDE ET DISPOSITIF PERMETTANT D'AMELIORER LE RAPPORT SIGNAL-BRUIT DE QUANTIFICATION LORS DE LA CONVERSION ANALOGIQUE-NUMERIQUE D'UN SIGNAL EN DIVERSITE DE FREQUENCE
Abstract: front page image
(EN)Device (200; 500) for minimizing the quantization noise in conversion between analogue and digital form of a multi-carrier signal comprising an AC component (V¿AC?) with a particular RMS value (V¿RMS?). The device comprises means (230; 530) for converting between analogue and digital form with a limited number (b) of bits within a quantization range (+V¿QR?), means (215, 235, 245, 255; 520) for minimizing the noise by creating an ideal ratio (VQR/VRMS) between the quantization range and the RMS value of the AC component, and means for reducing unwanted DC components in the signal and centering the signal by the wanted DC components being placed in the centre of the quantization range. The device is characterized by the fact that it comprises means (235, 245, 255; 520) for calculating a scaling factor $g(a) for the AC component which is used to create an ideal ratio between the root mean square value, the RMS value, of the signal and the quantization range (+V¿QR?), means (215; 510) for multiplication of the AC component by the scaling factor $g(a) before the conversion (230; 530), whereby the required ratio (V¿QR?/V¿RMS?) between the RMS value of the AC components (V¿RMS?) and the quantization range (V¿QR?) is obtained.
(FR)L'invention concerne un dispositif (200; 500) permettant de réduire le bruit de quantification lors de la conversion analogique-numérique d'un signal en diversité de fréquence comprenant une composante CA (V¿AC?) qui présente une valeur moyenne quadratique (V¿RMS?) particulière. Ce dispositif comprend des moyens (230; 530) de conversion analogique-numérique comprenant un nombre (b) limité de bits dans un intervalle ($m(f)u$m(g)+$m(f)/u$m(g)V¿QR?) de quantification, des moyens (215, 235, 245, 255; 520) permettant de réduire le bruit en créant un rapport (VQR/VRMS) idéal entre l'intervalle de quantification et la valeur moyenne quadratique de la composante CA et des moyens permettant de réduire les composantes CC indésirables dans le signal et de centrer le signal en plaçant les composantes CC indésirables au centre de l'intervalle de quantification. Ce dispositif est caractérisé en ce qu'il comprend des moyens (235, 245, 255; 520) permettant de calculer un facteur $g(a) de démultiplication pour la composante CA, utilisé pour créer un rapport idéal entre la valeur moyenne (valeur RMS) du signal et l'intervalle de quantification ($m(f)u$m(g)+$m(f)/u$m(g)V¿QR?), des moyens (215; 510) permettant de multiplier la composante CA par le facteur $g(a) de démultiplication avant la conversion (230; 530), ce qui permet d'obtenir le rapport (V¿QR?/V¿RMS?) requis entre la valeur (V¿RMS?) quadratique moyenne des composantes CA et l'intervalle (V¿QR?) de quantification.
Designated States: AE, AL, AM, AT, AU, AZ, BA, BB, BG, BR, BY, CA, CH, CN, CU, CZ, DE, DK, EE, ES, FI, GB, GD, GE, GH, GM, HR, HU, ID, IL, IN, IS, JP, KE, KG, KP, KR, KZ, LC, LK, LR, LS, LT, LU, LV, MD, MG, MK, MN, MW, MX, NO, NZ, PL, PT, RO, RU, SD, SE, SG, SI, SK, SL, TJ, TM, TR, TT, TZ, UA, UG, UZ, VN, YU, ZA, ZW.
African Regional Intellectual Property Organization (GH, GM, KE, LS, MW, SD, SL, SZ, TZ, UG, ZW)
Eurasian Patent Organization (AM, AZ, BY, KG, KZ, MD, RU, TJ, TM)
European Patent Office (AT, BE, CH, CY, DE, DK, ES, FI, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, GW, ML, MR, NE, SN, TD, TG).
Publication Language: English (EN)
Filing Language: English (EN)