Abstract: A holographic storage system. A low over-sampling technology and an adaptable gain-controlling unit are used in the holographic storage system for unequally amplifying signals generated by a detecting apparatus. Then the amplified signals generated by the detecting apparatus are summed in order to generate summing signals, which are used to detect original image frames for raising the resolution of the images and reducing the error rate of the data.

Abstract: A decoding method for optical storage device, which decodes channel bits upon a disc by partial response maximum likelihood (PRML) detection, is proposed. Unlike the conventional skills, the present method does not decode the detected RF signals directly, but adjusts values of parts of detected RF signals to their original ideal values before channel decoding instead, thereby reducing the decoding error rate of channel bits. The decoding method includes the step of: retrieving a first sequence of RF signals; identifying if the first sequence of RF signals contains a signal combination which satisfies a particular condition; adjusting a plurality of RF signals in the first sequence of RF signals to some pre-determined RF signals' value and then forming a second sequence of RF signals; and decoding the second sequence of RF signals. In a preferred embodiment of the invention, the method is applied to an optical storage system of PR (1,2,2,2,1) channel.

Abstract: A decoding method for optical storage device, which decodes channel bits upon a disc by partial response maximum likelihood (PRML) detection, is proposed. Unlike the conventional skills, the present method does not decode the detected RF signals directly, but adjusts values of parts of detected RF signals to their original ideal values before channel decoding instead, thereby reducing the decoding error rate of channel bits. The decoding method includes the step of: retrieving a first sequence of RF signals; identifying if the first sequence of RF signals contains a signal combination which satisfies a particular condition; adjusting a plurality of RF signals in the first sequence of RF signals to some pre-determined RF signals' value and then forming a second sequence of RF signals; and decoding the second sequence of RF signals. In a preferred embodiment of the invention, the method is applied to an optical storage system of PR (1,2,2,2,1) channel.

Abstract: A method of tracking error correction, primarily for utilization in optical disc drives using single beam optical pick-up heads. Delinearization in the tracking servo of a single beam optical pick-up head, contributed to by inherent design properties, is minimized by extracting a value proportional to a tracking error signal offset component from a tracking servo demand signal, applying a scaling factor to match the scaling applied to the tracking servo demand signal with scaling applied to the amplified tracking error signal, and subtracting the product of this function from the source signal i.e. the tracking error signal. The modified source signal, following this operation, has a reduced order of tracking error offset.

Abstract: A method for determining an optimum recording condition of an optical recording/reproducing apparatus is used for recording data into an optical disc. Data is first written into a plurality of test regions of the optical disc under a plurality of recording conditions, respectively. The data written into the plurality of test regions are converted into radio-frequency (RF) signals. The RF signals are Viterbi-decoded to obtain corresponding path metric increase rates. The path metric increase rates are used to determine an optimum recording condition.

Abstract: A method for simplifying a Viterbi decoder includes receiving a partial response, and determining an amount of redundant selector modules according to a tap number of the partial response; analyzing an output signal of the redundant selector modules for determining an initial input signal; and taking Viterbi decoding process to a sequence of data in the Viterbi decoder according to a forward trace status and the initial input signal.

Abstract: A method for determining output signals of a Viterbi decoder. The method includes: (a) receiving a plurality of digital signals through a path memory module of the Viterbi decoder with decoding an input signal; (b) comparing the received digital signals in step (a) with a default number; and (c) determining an output according to the comparison result provided by step (b).

Abstract: Method and system are provided for maximum likelihood detection on information channel, especially relate to detect abnormal signal pattern and change the branch metrics weighting of maximum likelihood detector to reduce effects introduced by noises or abnormal signals, therefore improve the detection performance. The method for adjusting branch metrics weighting could been implemented by multiply the branch metrics weighting with a predetermined coefficient or adjust it in accordance to a look-up table. Also a maximum likelihood detection method applied for CD/DVD drive system has been disclosed.

Abstract: A method of tracking error correction, primarily for utilization in optical disc drives using single beam optical pick-up heads. Delinearization in the tracking servo of a single beam optical pick-up head, contributed to by inherent design properties, is minimized by extracting a value proportional to a tracking error signal offset component from a tracking servo demand signal, applying a scaling factor to match the scaling applied to the tracking servo demand signal with scaling applied to the amplified tracking error signal, and subtracting the product of this function from the source signal i.e. the tracking error signal. The modified source signal, following this operation, has a reduced order of tracking error offset.