The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 29, 2001
Filed:
Nov. 10, 1999
Fabian Wenger, Göteborg, SE;
Telefonaktiebolaget LM Ericsson (publ), Stockholm, SE;
Abstract
Device (,) for minimizing the quantization noise in conversion between analogue and digital form of a multi-carrier signal comprising an AC component (V,) with a particular RMS value (V,). The device comprises means (,) for converting between analogue and digital form with a limited number (b) of bits within a quantization range (±V,), means (,) 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 (,) for calculating a scaling factor 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,), means (,) for multiplication of the AC component by the scaling factor &agr; before the conversion (,), whereby the required ratio (V,/V,) between the RMS value of the AC component (V,) and the quantization range (V,) is obtained.