专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

51. 发明专利

JPH11134816A CODING METHOD, CODING DEVICE, DECODING METHOD, DECODING DEVICE AND INFORMATION RECORDING MEDIUM 失效
公开(公告)号：JPH11134816A
公开(公告)日：1999-05-21
申请号：JP23615098
申请日：1998-08-21
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： SHIMADA TOSHIYUKI , NAKAJIMA TAKESHI
IPC分类号： G11B20/14
摘要： PROBLEM TO BE SOLVED: To enable resynchronizing and enable realization of a synchronization code having small correlation with other data by causing a synchronization code to have a detection code part and a bit synchronizing part conforming to a predetermined rule for synchronization at the time of demodulation, and causing the detection code part to be a code arranged immediately before the bit synchronizing part and not satisfying a predetermined rule. SOLUTION: Modulation means 21 constituting a digital data coding device performs (1, 7) modulation on digital inputted thereto, and outputs the modulated data. Synchronization code generation means 22 generates a 24-bit synchronization code made up of an adjustment code part, a detection code part and a bit synchronizing part (code for synchronization). The modulated data and the generated synchronization code are switched by switching means 23. The switching means 23 replaces the output of the synchronization code generation means 22 by code data corresponding to the period of the synchronization code of the modulation means 21, and outputs the resultant data as coded data.

52. 发明专利

JPH10126401A CLOCK REPRODUCTION CIRCUIT 失效
公开(公告)号：JPH10126401A
公开(公告)日：1998-05-15
申请号：JP29590196
申请日：1996-10-18
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： NAKAJIMA TAKESHI
IPC分类号： H03L7/06 , H04B7/26 , H04L7/033 , H04L7/08
摘要： PROBLEM TO BE SOLVED: To inexpensively and fast correct a frequency of a reproduction clock by setting learning data at the time of convergence to the optimum value that is held in memory when learning data makes a big error, etc. SOLUTION: When a voltage on-detecting circuit 12 detects a PONRST signal, it outputs a voltage on-detection signal 20 to a control circuit 18 and the circuit 18 reads learning data at the time of convergence to the optimum value that is stored in memory 19 and sets it to a learning correction functional digital PLL 17. When an LVA signal (active L) is received, learning data 26 of the circuit 18 is cleared and at this moment, the memory 19 stores the learning data at the time of convergence to the optimum value. There, a hit return signal 22 from a hit detection circuit 13 is outputted, a receiving mode is switched from intermittent receiving to continuous receiving, and the circuit 18 reads the learning data at the time of convergence to the optimum value from the memory 19 with the tailing edge of the signal 22 and sets it to the PLL 17.

53. 发明专利

JPH09312564A DIGITAL PLL 失效
公开(公告)号：JPH09312564A
公开(公告)日：1997-12-02
申请号：JP12464596
申请日：1996-05-20
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： NAKAJIMA TAKESHI , ABE MITSUHARU
IPC分类号： H03L7/06 , H04J3/06 , H04L7/033 , H04L27/22
摘要： PROBLEM TO BE SOLVED: To correct frequency difference due to the stability deterioration of TCXO during a non-reception period by information of difference between a reproducing clock obtained during the reception period and a base station transmitting clock with respect to the digital PLL which generates the reproducing clock of a TDMA system movement machine. SOLUTION: Phase following is executed in order to hold synchronization with a base station by clock reference 29 which is generated by a receiving signal (IF) in the digital PLL 14, a detecting circuit 15 detects a frequency dividing variable signal, an up-down control signal 23 with a load value N is operated based on an enable signal 22 and an up-down control signal 23 and the up-down counter B17 is operated by an outputted overflow signal 24 and the up-down control signal 25. The output of the up-down counter B17 is integrated by an integrating equipment 18 by a symbol unit so that frequency difference due to the stability deterioration of TCXO by information of difference between the reproducing clock obtained during the reception period and the base station transmitting clock is corrected and synchronization with the base station is held.

54. 发明专利

JPH09148982A TRANSMISSION/RECEPTION DATA CONTROLLER 失效
公开(公告)号：JPH09148982A
公开(公告)日：1997-06-06
申请号：JP32619495
申请日：1995-11-22
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： NAKAJIMA TAKESHI
IPC分类号： H04J3/06 , H04B7/26 , H04L7/08
摘要： PROBLEM TO BE SOLVED: To realize stable communication by controlling transmission with the free-running timer of one slave machine which is designated to be a temporary master at the time of direct communication between the slave machines. SOLUTION: At the time of direct communication between the slave machines, a call-side slave machine is designated to be the temporary master, for example, and the designation and a reproduction clock are synchronized with a reproduction clock fall by the edge detection circuit of the free-running timer 15. The enable of a frequency divider 14 is set to be high. The frequency divider 14 generates a free-running clock 1 based on a transmitter clocks signal, frequency- divides it into 1/2 and generates a self-running clock 2. The counter value of a timer 13 at that time is succeeded and it is loaded on the counter of the timer 15 with the clock 2. It counts it up based on the clock 2 and outputs it, Thus, self slot transmission timing on an air interface can be generated. Thus, transmission control is executed at the absolute time of the timer 15 and a transmission/reception processing on the air interface can be executed within the self slot. Then, collision with the other slot is eliminated and stable inter-slave machine direct communication can be realized.

55. 发明专利

JPH07129959A DISK RECORDING METHOD AND DISK RECORDER 失效
公开(公告)号：JPH07129959A
公开(公告)日：1995-05-19
申请号：JP27951393
申请日：1993-11-09
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： FURUMIYA SHIGERU , NAKAJIMA TAKESHI , TAKEMURA YOSHIYA
IPC分类号： G11B7/00 , G11B7/0045
摘要： PURPOSE:To improve a reproduction error rate and to attain high density recording when the data are PWM recorded on a rewritable optical disk by compensating thermal interference between marks and a peak shift due to a frequency characteristic at the time of reproducing. CONSTITUTION:This device is constituted so that a signal equivalent to the mark of PWM recording is resolved into to a start end part with a fixed width, an intermediate part with a burst state and an end part with the fixed width by a start end pulse generation circuit 2, a burst gate generation circuit 4 and an end pulse generation circuit 6, and recording is performed by switching a binary laser output at high speed with the signals. Then, by detecting the positions of the starting part and the trailing part of the mark when a mark length is smaller and when space lengths of front and rear of the mark are smaller, and recording them changing from the positions when the mark length and the space length are longer, the peak shift due to the thermal interface and the reproducing frequency characteristic is compensated at the time of recording.

56. 发明专利

JPH06178288A PICTURE SIGNAL CODER AND RECORDING AND REPRODUCING DEVICE 失效
公开(公告)号：JPH06178288A
公开(公告)日：1994-06-24
申请号：JP32910092
申请日：1992-12-09
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： INOUE TAKASHI , NAKAJIMA TAKESHI , TAKEMURA YOSHIYA
IPC分类号： H04N5/92 , H04N19/423 , H04N19/50 , H04N19/503 , H04N19/65 , H04N19/70 , H04N19/85 , H04N7/137
摘要： PURPOSE:To provide a picture signal coder and the recording and reproducing device accessed in a short time even when a picture signal is divided into plural signal components, coded and recorded/reproduced. CONSTITUTION:The device is provided with a divider 2 dividing a digital picture signal into 4(N)-sets of signal components, four coders 3-6 coding the signal components while dividing the coding into in-picture coding picture for coding in a single picture and inter-picture coding picture for coding through prediction from the in-picture coding picture, and a code string synthesizer 11 obtaining M-sets (1

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式