Abstract: Method for demodulating a sampling signal from a storage medium, which dispenses with the use of a PLL, and to a device for reading from and/or writing to storage media which uses such a method. Method for demodulating a sampling signal from a storage medium, the information in the sampling signal being coded in pulse lengths of an integer multiple of the period of the modulation frequency, has the steps of: determining the current pulse length and/or the current total length of two successive pulses; determining the maximum pulse length which occurs in the sampling signal and/or the maximum total length of two successive pulses, and comparing at least two of the values determined in order to determine the type of sampling signal or to establish a synchronization bit sequence.

Abstract: The present invention relates to a method for correcting the operating point of a focus control loop for a scanner for optical storage media. According to the invention, the method comprises the steps of: extracting from a focus error signal (FE) a signal component caused by vertical wobble of the optical storage medium; integrating the extracted signal component; and correcting the operating point with the aid of the integrated signal.

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).

Abstract: The invention relates to a method and an arrangement for a replay or recording appliance for optical recording media having an inclination control system for vertical alignment of the scanning beam with respect to optical recording media. In order to exclude other factors which, in addition to the inclination of the scanning beam, influence the radio-frequency signal which is detected by the recording medium, without any additional inclination sensors from the disadvantageous influence of the inclination control, an inclination control system is provided which uses the lower envelope curve signal of a radio-frequency signal which is detected by the optical recording medium and represents the dark value of the detected radio-frequency signal.

Abstract: The present invention relates to a method for correcting the operating point of a focus control loop for a scanner for optical storage media. According to the invention, the method comprises the steps of: extracting from a focus error signal (FE) a signal component caused by vertical wobble of the optical storage medium; integrating the extracted signal component; and correcting the operating point with the aid of the integrated signal.

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).

Abstract: The invention relates to a method and an arrangement for a replay or recording appliance for optical recording media having an inclination control system for vertical alignment of the scanning beam with respect to optical recording media. In order to exclude other factors which, in addition to the inclination of the scanning beam, influence the radio-frequency signal which is detected by the recording medium, without any additional inclination sensors from the disadvantageous influence of the inclination control, an inclination control system is provided which uses the lower envelope curve signal of a radio-frequency signal which is detected by the optical recording medium and represents the dark value of the detected radio-frequency signal.