Abstract: When writing data to an optic disc with a constant linear velocity, and encountering a disc error, data is written into the defect management area of the disc without changing the rotational speed of the disc, or at least without changing the rotational speed of the disc sufficiently to maintain a constant linear velocity. This allows an increase in the rate at which data may be written to the optical disc. It also avoids or reduces the need for the rotational speed of the disc to be changed, which allows a further improvement in the time taken to write data to the disc. In order to continue writing data to the disc without changing the rotational speed, the data rate must be increased while writing to the defect management area. For this to be possible, the data must be written into an “iced” or unformatted part of the defect management area.

Abstract: A wobble signal is generated from at least two elementary signals (A,B,C,D) detected by scanning a wobbled track of a data carrier. The invention proposes a solution for eliminating the noise of various origins in the wobble signal, notably the high frequency data leakage into the wobble signal due to radial asymmetry introduced in the diffraction pattern on the detector, whatever the reason for this radial asymmetry. According to the invention, the at least two elementary signals are filtered with at least an adaptive filter (40), and said filtered elementary signals are subtracted (44) from said wobble signal (PP) thereby generating an improved wobble signal.

Abstract: The waveform equalizer (6) for obtaining a corrected signal S? by performing a waveform equalization to a read signal S read out from an information carrier (1). The waveform equalizer (6) has a first filter (61) able to perform a filtering process to said read signal S, and an amplitude limiting means (62) able to obtain an amplitude limited read signal SLIM by limiting an amplitude level of said read signal S by a predetermined amplitude limitation value. A second filter (63) is provided which is able to perform a filtering process to said amplitude limited read signal SLIM. Further, an adder (64) is present which is able to add the signals obtained by performing the filtering process by each of said first (61) and second filters (63), able to generate an addition result as said corrected read signal S?.

Abstract: An arrangement is disclosed for receiving a digital signal from a transmission medium. The arrangement comprises a variable equalizer for equalizing a received signal so as to obtain an equalized signal, and bit-detector for detecting a sequence of bits from the equalized signal. The arrangement further comprises an asynchronous sampling unit for sampling a received analog signal so as to obtain a first signal having asynchronous samples. To control the variable equalizer a control signal is generated from the values of at least one sample of a signal having asynchronous samples, at either side of a zero crossing in signal.

Abstract: An arrangement is disclosed for receiving a digital signal from a transmission medium. The arrangement comprises a variable equalizer (6) for equalizing a received signal so as to obtain an equalized signal, and a bit-detector (12) for detecting a sequence of bits from the equalized signal. The arrangement further comprises an asynchronous sampling unit (4) for sampling a received analog signal so as to obtain a first signal having asynchronous samples.