Dynamic information storage or retrieval – Binary pulse train information signal – Including sampling or a/d converting
Reexamination Certificate
2004-12-03
2008-08-05
Hindi, Nabil (Department: 2627)
Dynamic information storage or retrieval
Binary pulse train information signal
Including sampling or a/d converting
C369S059220
Reexamination Certificate
active
07408861
ABSTRACT:
The invention relates to a recording or reproduction apparatus for optical recording media having means for increasing the resolution of a digital-to-analog converter (DA), such as, for example, a digital-to-analog converter (DA) which is provided in the servo regulating circuit of a recording or reproduction apparatus and has a smaller bit width than its digital data source (DD). In order to increase the resolution or precision of the digital-to-analog converter (DA), a method and a circuit arrangement are provided by means of which less significant bits (L) of the digital data source (DD) are quantized and the quantization result is added to the value of more significant bits (H) of the digital data source (DD) with the exception of the maximum value of the more significant bits (H) for the purpose of increasing the resolution of the output signal of the digital-to-analog converter (DA). The resolution or precision of the digital-to-analog converter (DA) is improved without increasing the bit width of the digital-to-analog converter (DA) and, since the means for increasing the resolution of a digital-to-analog converter (DA) are provided exclusively in the digital domain, a smaller circuit volume is required for the digital-to-analog converter (DA) with means for increasing the resolution in comparison with the digital-to-analog converter having a corresponding bit width. The application of the invention is provided in particular for regulating circuits in which the bit width is greater than that of the digital-to-analog converter (DA).
REFERENCES:
patent: 4006475 (1977-02-01), Candy et al.
patent: 5170387 (1992-12-01), Groen
patent: 5969656 (1999-10-01), Itoku
patent: 6362764 (2002-03-01), Niimi et al.
patent: 38 54 744 (1998-12-01), None
patent: 09 083368 (1997-03-01), None
patent: WO 98/27653 (1998-06-01), None
Search Report dated Jul. 26, 2004.
European Search Report dated Jun. 29, 2005.
Hindi Nabil
Laks Joseph J.
Shedd Robert D.
Thomson Licensing
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