专利检索_..脉冲调制记录或重现的（脉冲编码调制记录的入G11B20/10）专利检索_..脉冲调制记录或重现的（脉冲编码调制记录的入G11B20/10）专利检索查询_..脉冲调制记录或重现的（脉冲编码调制记录的入G11B20/10）专利检索查询分析平台

序号	专利名	申请号	申请日	公开（公告）号	公开（公告）日	发明人
261		JP12269784	1984-06-14	JPH0789425B2	1995-09-27

262		JP2452284	1984-02-14	JPH0683486B2	1994-10-19	KORUNERISU ANTONII SHOHAMERU INMINKU; RONARUDOSU MARIA AARUTSU; YOSEFUSU AANORUDOSU HENRIKUSU MARIA KAARAMU; ADORIANUSU FUIBERUTO HOOHENDEIEIKU

263	OPTICAL DISK DEVICE	JP15427092	1992-05-21	JPH05325409A	1993-12-10	SHIYUKUNAMI SHIYUUICHI; ITONAGA MAKOTO
PURPOSE:To reduce a disturbance given to a main signal component from a sub-signal component at the time of reproducing an optical disk in which a main signal and a sub-signal are subjected to multiplex modulation and recorded by using a pulse width modulating system. CONSTITUTION:This device is provided with a main signal detecting circuit 4 for extracting a main signal SM from an output of an optical pickup, a sub- signal detecting circuit 5 for extracting a sub-signal SS, a neural net 10 having a non-linear input/output characteristic and consisting of plural converting units coupled by a separate coupling coefficient, and a signal delaying circuit 20 for delaying a signal. The main signal SM is inputted to the neural net 10 through the signal delaying circuit 20, and also, the sub-signal SS is inputted to the neural net 10.
264		JP11909279	1979-09-17	JPS6228481B2	1987-06-20	FUJIWARA TATSUO

265	RECTANGULAR WAVE ADAPTED TYPE EQUALIZER	JP5431785	1985-03-20	JPS61214277A	1986-09-24	OTAKA TOSHINORI
PURPOSE:To simultaneously correct dislocation of a level change point generated at recording medium forming and a signal reading by changing adaptably an equalizer characteristic by using information changing with time of a reproducing signal as a control signal a as control signal. CONSTITUTION:A signal 10 read by a pick up is shaped in wave form to be a rectangular wave shape by using a comparator 20 based on a reference voltage to obtain a signal 14. Based on this signal 14, as a first step, by a wave shape generating circuit 22, integrators 57-A-57-D, correction value generating circuits 37-A-37-D, and an adding circuit, dislocation of the level change point generated by a filtering effect during a signal reading is corrected to obtain a signal 47. Then, as a second step, by a trapezoidal wave shape generating circuit 48, a comparator 50 and an adding circuit, the dislocation of the level change point generated at forming the recording medium is corrected and finally, a signal 51 in which the changing point correction is obtained.
266	Method and device for pcm signal reproduction	JP20819284	1984-10-05	JPS6187277A	1986-05-02	OKAMOTO HIROO; KOBAYASHI MASAHARU
PURPOSE: To reduce an error flag processing circuit and the number of times of accessing of a data memory circuit by adding an error flag in a system unit of an error detecting correction code, and writing an error flag of high- order symbol and an error flag of a low-order symbol together as one error flag error flag to a data memory circuit. CONSTITUTION: From a memory circuit 15, a data is inputted to an error detecting correction circuit 17, a first error detection and correction is carried out. In case of capable of correcting, the data stored in the memory circuit 15 is corrected. Then, a first error flag Fc ₁ is stored in the memory circuit 15. In a second error correction, a data is inputted to an error correction circuit 17 from a memory circuit 15. In case of capable of correction, the data stored in the memory circuit 15 is corrected. Further, the second error flag Fc ₂ produced during a detection and the correction of the error thereof is inputted to an error flag processing circuit 21 to produce an error flag Fc ₂'. Namely, the value of Fc ₂ of the high-order symbol and the value of Fc ₂ of the low-order symbol are stored to latch circuits 24, 25. Then, from these values, the Fc ₂' is produced by an Fc ₂' producing circuit 26. COPYRIGHT: (C)1986,JPO&Japio
267	INFORMATION RECORDING DEVICE AND INFORMATION REPRODUCING DEVICE	JP12269784	1984-06-14	JPS613363A	1986-01-09	KOBAYASHI YOSHIKAZU
PURPOSE:To obtain a picture of high quality without generating beats due to interference of two signals by recording video signals and aural signals in separate tracks and reproducing separately. CONSTITUTION:A cynchronizing signal generator 5 records each frame number of video signals, and generates signals mixed with frequency modulated aural signals synchronizing with the frame numbers. Light beams of an argon laser is bisected by a splitting device 24, and one beam is supplied to a light modulator for voice 23 and another beam is supplied to a light modulator for video 3 through a mirror 25. On the other hand, the light beam of a helium neon laser 14 is bisected by a beam splitting device 26, and one beam enters the beam splitting device 15 of an optical recording head 10 for video 10 through a mirror 27, and another beam enters the beam splitting device 55 of an optical recording head for voice through mirrors 28, 29. Video and aural signals are recorded on different areas of the same disk 9 by heads 10, 50 that move while keeping specified distances.
268	ELIMINATING CIRCUIT FOR SOUND SIGNAL NOISE	JP3992184	1984-03-01	JPS60182505A	1985-09-18	NAGANO YASUYUKI
PURPOSE:To improve the waveform fidelity by giving PAM modulation to a high frequency carrier synchronous with an RF switching pulse with a reproduced sound signal and therefore eliminating the switching noise to avoid mixture of low band noises to the sound signal. CONSTITUTION:A hold mode period is set equal to or slightly larger than the time width of a switching noise as shown by a figure A. At the same time, a control signal E is synchronous with an RF switching pulse F. Therefore the PAM modulating action is equal to a preholding action at a track changeover time point. The noise width can be estimated by the band of a reproduced sound signal route and therefore decided easily. A reproduced sound signal A containing the switching noise due to the switching by the pulse F is sampled and held with the timing as shown by E. Thus a sampling/holding output is obtained as shown by B, and a PAM modulation output is obtained as shown by C. This signal C is interpolated by an LPF to obtain a sound signal free from the switching noise as shown by D.
269		JP11940083	1983-07-30	JPS6026604U	1985-02-22

270	Record signal encoding method, record carrier and encoding/reproducing device	JP2452284	1984-02-14	JPS59172899A	1984-09-29	KORUNERISU ANTONII SHIYOUHAMER; RONARUDOUSU MARIA AARUTSU; YOSEFUSU AANORUDOUSU HENRIKUSU; ADORIANUSU FUIBERUTO HOOHENDEI

271	Two marking signals recorder/detector	JP22860983	1983-12-05	JPS59112408A	1984-06-28	PEETAA GOORUDOMAN

272	Magnetic recording and reproducing system	JP12631780	1980-09-11	JPS5750306A	1982-03-24	YAMAMORI KAZUTAKE; FUJIWARA TATSUO
PURPOSE:To make recording and reproducing of a good linearity possible, by subjecting an analogue frequency to both-edge pulse modulation by the carrier wave of a frequency higher than its frequency band and by recording it onto a recording medium in vertical magnetization. CONSTITUTION:An analogue input signal is supplied to a both-edge PWM modulator 2 through an amplifier 1 and is subjected to both-edge pulse modulation by the carrier wave of a frequency higher than the frequency of the input signal. A magnetic head 5 to which this modulated signal is given converts the signal to a recording magnetic field of an amplitude larger than that of its magnetization inverting magnetic field and recording it onto a recording medium 4, which has a rectangular hysteresis characteristic, in vertical mangetization. Next, this recording medium 4 is reproduced by a reproducing head 6 which has characteristics of a high sensitivity for input signal frequency components and of a low sensitivity for carrier frequency components. Thus, analogue signal recording and reproducing of a good linearity is performed.
273		JP4881875	1975-04-10	JPS5626168Y2	1981-06-22

274		JP7234172	1972-07-19	JPS5622191B2	1981-05-23

275		JP13232774	1974-11-15	JPS5529483B2	1980-08-04

276		JP9019573	1973-08-10	JPS5412042B2	1979-05-19

277	SYNCHRONOUS SIGNAL COMPOSITE CIRCUIT	JP7442775	1975-06-20	JPS51151114A	1976-12-25	SAGAWA AKIO
PURPOSE:The synchronous signal composite circuit shall be provided, of which recording density of data signal is not decreased by the pulse recurrence interval of an index pattern.
278		JP13232774	1974-11-15	JPS5157418A	1976-05-19	HIRASHIMA MASAYOSHI; UNO KYOICHI

279	KOTEIHETSUDO VTR KIROKUSAISEISOCHI	JP9398974	1974-08-16	JPS5122413A	1976-02-23	MISAKI TAKASHI

280	KOTEIHETSUDO VTR KIROKUSAISEISOCHI	JP9398874	1974-08-16	JPS5122412A	1976-02-23	MISAKI TAKASHI

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