Abstract:
PURPOSE: A device and a method for detecting binary data are provided to detect a level value for Viterbi decoding from a digital signal if at least more than two binary data values are identical, thereby more exactly detecting binary data from an analog signal. CONSTITUTION: An ADC(11) converts an inputted analog signal into a digital signal. At least one binarizer(13,15) converts the digital signal into binary data. A Viterbi decoder(16) performs a Viterbi decoding process, and detects the binary data from the digital signal. A level detector(18) receives at least more than two binary data among the digital signal, the outputted binary data of the Viterbi decoder(16) or the outputted binary data of the binarizers(13,15), and detects a level value for Viterbi decoding from the digital signal if at least more than two binary data values are identical, then outputs the detected level value.
Abstract:
PURPOSE: A PLL device and a method of a disk driver are provided to supply a PLL which does not consider a phase error for a reproduction signal having the shortest period of a disk or a period near to the shortest period in consideration of code features of the disk, thereby realizing a high disk recording density. CONSTITUTION: A period checker(203) checks a period of a signal reproduced from a disk. A phase detector(201) detects a phase difference between the reproduction signal and a system clock signal, and outputs the detected phase difference as a phase error. A loop filter(205) outputs a voltage corresponding to the phase error. A transmission processor(204) processes whether to transmit an output of the phase detector(201) to the loop filter(205) by the signal outputted from the period checker(203).
Abstract:
PURPOSE: A data recording and reproducing method, a data recording and reproducing device, and a recording medium for recording a program for realizing the method and the device are provided to modulate additional information data by using a modulation code used for recording user data, thereby forming a wobbling groove which displays the additional information data without using another modulation device. CONSTITUTION: A system receives user data and additional information data, and generates a modulation signal by using the same modulation code(410). The system receives the modulated user data and the additional information data, and creates NRZI(Non-Return to Zero Inverted) signals corresponding to the user data and the additional information data(420). The system records an NRZI signal of the user data according to the first recording method while recording an NRZI signal of the additional information data according to the second recording method(430).
Abstract:
PURPOSE: A frequency detecting apparatus for generating clocks of an optical disk and a method thereof are provided to stably obtain a frequency error even if the quality of a reproduced signal is bad and even if a frequency difference between an input signal and an oscillation frequency is big, thereby improving the stability of a PLL(Phase Locked Loop) circuit. CONSTITUTION: A signal amplifying filter(410) filters radio frequency components of a predetermined input signal, and amplifies the filtered radio frequency components. A frequency detector(420) receives the input signal of which the radio frequency components are amplified and a predetermined clock signal to detect a frequency difference between the input signal and the clock signal, and to generate a control voltage corresponding to the frequency difference.
Abstract:
PURPOSE: A device and a method for playing optical information are provided to play a read-only and a rewritable optical information storing medium that writes the data related the storing medium to a lead-in area as a wobbling pit and writes the data to a user area as a pit. CONSTITUTION: A light source irradiates a laser beam. An objective lens collects the light irradiated from the light source and focuses the collected light on the optical information storing medium. A photo detector includes the first and the second light receiving part independently converting the light reflected from the optical information storing medium into an electric signal. A data demodulator(61) demodulates a user data signal related to the playback from a sum signal of the first and the second light receiving part. A ROM-PIC(Permanent information and Control data) demodulator(63) demodulates the information related to the storing medium from the sum signal of the first and the second light receiving part.
Abstract:
PURPOSE: An optical information storage medium, and a method for recording and reproducing the same are provided to simplify a manufacturing process, improve recording and reproducing characteristics by forming pits in depth of outputting optimum signals, and maintain the consistency with other kinds of storage mediums. CONSTITUTION: An optical information storage medium includes a lead-in area, a user data area, and a lead-out area. Data are recorded on the lead-in area, the user data area, and the lead-out area in pit. Information data unchangeable to the same physical format are recorded on the whole area or a partial area of the lead-in area. The information data are recorded by a bi-phase modulation method while data of other areas are recorded by an RLL(Run Length Limit) modulation method.
Abstract:
PURPOSE: A signal reproducing method for compensating a channel distortion and a device therefor are provided to detect a section having the most errors for signals to be reproduced, and to calculate a distortion amount in the detected section to perform error correction, so as to reduce complexity of hardware and software and enhance correctness in error correction. CONSTITUTION: A maximum error generating area is decided from signals(y(k)) passing a channel(600). Whether the multiplication of signals y(n) and y(n-1) at two sampling points is not more than 0(zero) is decided to detect level transition(602). If so, level transition is decided to be generated and a transition frequency is checked(604). If the transition frequency is not more than a predetermined frequency(j), a predetermined reference signal is modeled(606). If the transition frequency is more than (j), a value adding a previously calculated final distortion amount to the reference signal calculated as in the 606 step is set as a reference signal(608). Plural error paths are detected for the signals of a maximum error generating area(610). Differences between signals in each error path and the reference signal coinciding with a level transition direction of the error paths are calculated, and an error path having the smallest absolute value from the differences is detected as an optimum error path(612). If the transition frequency is less than (j), an absolute value of a difference between an optimum error path signal and the reference signal is stored as a distortion amount(614). If the transition frequency is equal to (j), distortion amounts stored in the 614 step and current distortion amounts are added and averaged to calculate a final distortion amount(616). Error correction is performed for signals on the optimum error path(618). And the error-corrected signals are restored to original signals(620).
Abstract:
PURPOSE: A device for processing a signal of a monitor is provided to watch high resolution of signals with implementing a PIP(Picture In Picture) function on a CDT(Color Display Tube) monitor. CONSTITUTION: A device for processing a signal of a monitor includes a signal distributing element distributing an output signal of a PC(20) in analog form or digital form; a signal processing element(25) executing a PIP signal process of displaying one of the digital PC signal and the decoded input TV/video signal as a main picture and of displaying the rest as a plurality of sub-pictures, or processing the TV/video signal to be displayable; a switching element(27) switching the analog PC signal output from the signal distributing element in the case of displaying only a PC picture, and switching the signal output from the signal processing element in the case of displaying PIP and TV/video picture; and a monitor(29) amplifying the switched signal for displaying.
Abstract:
PURPOSE: An optical recording medium having recorded synch data including additional information, a method and an apparatus for recording the synch data, and a method and an apparatus for reproducing the synch data are provided to obtain recording order information of the corresponding addressing information with synch data before reading the addressing information. CONSTITUTION: In an optical recording medium having formed tracks for recording user data, the optical recording medium includes addressing information notifying record position of the user data, synch data in regard to the addressing information, additional information inserted into the synch data, wherein the addressing information and the synch data are recorded at a header region arranged between the tracks, and the additional information is inserted between a first synch data part and a second synch data part and includes information in regard to recording order of the corresponding addressing information.
Abstract:
PURPOSE: A method for generating and arranging code is provided to increase efficiency in recording density by using a short code word bit as a main conversion code word length, enable excellent DC suppression capability of code rows. CONSTITUTION: A method for generating and arranging code includes the steps of generating code words corresponding with a predetermined run length condition and grouping the code words by the run length condition(300), arranging code words to make code rows to source words have a DC control capability(310), checking whether a predetermined boundary condition is satisfied in the code rows(320), replacing with a code word satisfying the boundary condition with maintaining DC control property if the boundary condition is not satisfied(330).