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JP2004187212A |
To provide a reproducing method for enhancing the reproducing speed of recorded signals which are recorded on a recording medium.In the reproducing method for applying frequency demodulation and Bi-phase demodulation in order, to the rec...
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JP2004518241A |
This invention relates to a digital modulation method and apparatus used for recording an audio or video signal, computer data, and etc on a recording medium such as an optical or magneto-optical disc. Data words of m bits are translated...
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JP3536993B2 |
PURPOSE: To correctly obtain a multivalued signal code value even when local fluctuation exists by generating a threshold value from an envelope waveform based on a voltage value corresponding to a nonzero point, a zero point estimated f...
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JP3528929B2 |
PURPOSE: To prevent possible large errors in a clock generated from a reproduction signal during the reproduction. CONSTITUTION: In the encoding of a block, a data of (m) bit is converted to a data of (n)(>m) bit and then, expressed in a...
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JP3528634B2 |
To realize non-contact optical transmission without being restricted by the number of insertion/extraction times or optical transmission by means of a fiber cable with which intermediate distance transmission is easy by executing encodin...
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JP3528117B2 |
To provide a bipolar/unipolar conversion circuit which does not adjust clock extraction and whose circuit is made into a small scale. In the conversion circuit, a clock extraction unit 2 is constituted of a digital PLL circuit containing...
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JP3527674B2 |
To well allocate the channel codes by allocating a selected shorter channel code after it's verified that several longer channel codes dependent on the shorter channel code are available for the allocation. When a longer channel code is ...
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JP2004134018A |
To solve the problem that in a conventional optical disk, recording and reproducing are hard to keep compatibility of high reliability and a low error rate.An average run length of a RLL code when a crystal state is recorded is made shor...
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JP2004513469A |
A record carrier, and method for manufacturing such record carrier, which can be copies with the aid of a copying apparatus, while the copied record carrier is unreadable. During copying with the aid of the copying apparatus, merge bits ...
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JP3522745B2 |
To provide a transmission-line coding method and decoding method that enable the correct detection of symbols during reception, without picking up the identical symbols continuously under multiple-value signal transmission, even when the...
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JP2004129072A |
To easily convert a conversion rate of a sampling frequency with a simplified structure.On the basis of a sampling frequency Fs1 of an input signal and a sampling frequency Fs2 of an output signal there are calculated a ratio R of Fs1 wi...
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JP2004511058A |
Method and apparatus for recording data on a magnetic recording medium and writing data to a computer bus in which the data is divided into words of a predetermined length, a signal is generated for each data word, having an amplitude wh...
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JP3516142B2 |
To prevent illegal copy of digital data by recording data in a data recording medium so that secret data is not copied in a personal computer or the like as it is. A data recording device is provided with a memory 23 in which a plurality...
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JP3515798B2 |
PURPOSE: To improve the stability of a waveform shaping circuit by forming the shaping circuit by integrating the functionality of an addition resistance network and a filter in a single integrated circuit together with a transmission st...
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JP3514978B2 |
To provide a digital switching amplifier whose power efficiency is satisfactory and which can obtain a sufficient S/N even if the amplitude of an input signal is small. A digital switching amplifier is provided with a quantizer 3 which Î...
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JP3508412B2 |
To accurately decode received split-phase codes and Manchester codes, etc., without requesting high performance to a reception circuit by providing a means for sampling reception data reproducing signals based on bit synchronizing signal...
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JP3509083B2 |
PURPOSE: To enlarge a geometrical distance at the viterbi decoding time in a PR. CONSTITUTION: The state of 3×3 is arranged on a plane composed of a horizontal axis and a vertical axis. A code 11 is allotted to correspond to the transit...
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JPWO2002037785A1 |
Provided is a data transmission method capable of suppressing a communication error by a simple microcomputer processing method. It consists of H level and L level, and the pulse width of one of them is specified as the first basic signa...
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JP3505149B2 |
The decoder element is used for producing an output signal having three different potentials at an output. The second potential is situated between the first potential and the third potential. The decoder element makes it possible to pro...
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JP3504119B2 |
To realize demodulation with a low bit error rate even at the time of noise or interference in the demodulation of reception data group which is encoded so as to express one symbol by plural bits in a time axis. A system is composed of a...
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JP2004507016A |
The invention relates to a method for generating a primary binary signal having a predetermined spectral shape in a predetermined frequency range, in particular having a notch in the power spectrum in a predetermined frequency range. In ...
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JP2004507030A |
The invention relates to a method of storing a number of data bits of a secondary channel ( 30 ) in the frame of a main channel ( 20 ) and to a method of decoding a stream of bits relating to a secondary channel ( 30 ) embedded in the fr...
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JPWO2002029810A1 |
The address decoder uses a PLL circuit (103) that generates a PLL clock signal PCLK that synchronizes with the external clock signal CLK, a frequency divider (104) that divides the PLL clock signal PCLK, and a binary wobble signal ADRT o...
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JPWO2002029811A1 |
Provided are a recording medium, a recording device thereof, and a playback device for data having a high effective recording density and a high error correction capability. The recording device encodes input data by a coding method incl...
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JP3498333B2 |
PURPOSE: To provide a digital video signal processor capable of stably decoding reproducing data even when a transmission rate by variable speed reproduction in a VTR is changed. CONSTITUTION: A digital VTR quantizes reproducing signals ...
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JP3492792B2 |
PURPOSE: To generate the nonreturn-to-zero(NRZ) wave-form having a quick cycle from the shaping section output by inputting the pattern generator output to a programmable data selector, outputting both patterns corresponding to both timi...
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JP2004032501A |
To generate a PWM signal more closely approximating a PWM signal with respect to a polarity inverted signal of an analog signal by interpolating a polarity inverted signal of an input digital signal to generate a second PWM signal, to ob...
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JP3487228B2 |
To realize an encoding machine that converts NRZ code data into an accurate Manchester code data which do not include hazards in spite of a small circuit area. A 1st flip-flop 11 latches NRZ code data by a 1st clock, to generate noninver...
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JP2004005901A |
To provide a means for reducing the number of bit cells per information and preventing reduction in the number of specific bit combinations.The invention relates to a method for converting an m bit information word 1 to an n bit code wor...
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JP3482212B2 |
Encoding arrangement and method for encoding (n-1) information words into n-bit channel words and decoding arrangement and method for decoding the channel words into information words. The encoding arrangement is to obtain a channel sign...
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JP3478290B2 |
To provide a duty correction circuit with a low bit error rate by means of demodulation using signals whose waveform distortion is corrected. Waveform distortion is detected by observing waveforms and the distortion is corrected. Even wh...
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JP2003536346A |
The present invention relates to method and apparatus of converting a series of data words into modulated signals. This method divides a data word, which a sync signal is to be added in front or rear of when it is written in a recording ...
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JP2003536345A |
The present invention relates to method and apparatus of converting a series of data words into modulated signals. This method divides a data word, which a sync signal is to be added in front or rear of when it is written in a recording ...
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JP2003536315A |
In a device for encoding a stream of databits of a binary source signal into a stream of databits of a binary channel signal the bitstream of the source signal is divided into n-bit source words. The device comprises converting means ada...
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JP3473135B2 |
PURPOSE: To record secret information whose copying is impossible on a recording medium and to prevent an authorized copying by using them. CONSTITUTION: Two kinds of specific pits are recorded at specific positions on an optical disk 2....
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JP2003338139A |
To provide a CD which substantially prohibited in copying.The CD includes: a recording area where the first data string is encoded by a CIRC (cross interleave Reed-solmon code) 4 system and recorded; and a recording area where the second...
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JP3467276B2 |
A sequence of m-bit information words is converted to a modulated binary signal. For each received information word from the sequence an n-bit code word is delivered. The delivered code words are converted to the modulated signal. When o...
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JP3466797B2 |
To attain the reliable and fast radio transmission of a large capacity of information even in an environment where multipath fading, shadowing, etc., exist. The state of a transmission line is estimated by a state of transmission line es...
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JP3467198B2 |
To minimize influence or other optical communication in the case of conducting optical communication. In the case of conducting infrared ray optical communication by using a subcarrier DC light is added and emitted for a time period T1 w...
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JP2003323761A |
To provide a CD which cannot reproduce an encryption key.Main data, data of information necessary to reproduce the main data and prescribed data having a DSV (Digital Versatile Disc) value outside the prescribed range are recorded in a r...
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JP3466130B2 |
To efficiently suppress the DC component with a few bits by considering the feature parameters CSV ad INV of a code word and allocating/arranging them to a code word main code group and a judgment code group for discriminating a multiple...
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JP2003318738A |
To realize a PWM device which can generate a PWM suitable for making an HDL IP and which can especially synthesize in a high-speed operation without problems and also to provide a design method therefor.1: An input terminal of an on-widt...
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JP3462084B2 |
To surely provide phase synchronism, even if there is a phase difference between an input biphase signal and a clock signal for identifying this signal. This signal identifying device is provided with a clock generating part 23 for gener...
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JP2003533120A |
A method of converting a stream of databits of a binary information signal into a stream of databits of a constrained binary channel signal, a device for encoding, a signal, a record carrier, a method for decoding, and a device for decod...
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JP2003532338A |
A device is provided for encoding a stream of data bits of a binary source signal (S) into a stream of data bits of a binary channel signal (C1), wherein the bit stream of the source signal is divided into n-bit source words (x1, X2). Th...
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JP3461914B2 |
PURPOSE: To provide a ternary input discrimination circuit capable of discriminating the three kinds of input states without the need of a third fixed potential in the input potential of an external terminal. CONSTITUTION: This ternary i...
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JP3459417B2 |
A method for converting and encoding an analog signal to a digital format and subsequently decoding and converting said digital format to recover the analog signal, comprising the steps of monitoring the physical characteristics of an an...
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JP3458782B2 |
To execute demodulation with a low bit error rate through the use of a reproduction clock with high precision and a signal with a corrected waveform distortion by inverting a reception signal when the waveform distortion is detected and ...
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JP3457093B2 |
PURPOSE: To obtain a run length limit code of a required restriction by converting a data word to a code word while referring to a conversion table with a specified constitution and rewriting a bit in a specified system in the conversion...
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JP2003529875A |
The invention relates to a method for encoding a stream of bits of a signal relating to a binary source into a stream of bits of a signal relating to a binary channel, the binary source comprising a main source and a secondary source, th...
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