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
41		JP11276674	1974-10-02	JPS5140110A	1976-04-03	ACHIHA MASAHIKO

42		JP9990570	1970-11-12	JPS502568B1	1975-01-28

43		JP6271469	1969-08-05	JPS4921966B1	1974-06-05

44		JP5541372	1972-06-03	JPS4917214A	1974-02-15

45		JP1306865	1965-02-18	JPS4022447Y1	1965-08-02

46	Implementing combined phase and amplitude magnetic defect detection on-the-fly	US13495903	2012-06-13	US08736997B2	2014-05-27	Richard Leo Galbraith; Weldon Mark Hanson; Martin Aureliano Hassner; Travis Roger Oenning; Satoshi Yamamoto
A method, apparatus, and system are provided for implementing magnetic defect location detection on-the-fly for hard disk drives. A magnetic media readback signal of a hard disk drive is demodulated to generate phase modulation (PM) and amplitude modulation (AM) signals. A new coordinate plane defined by a combined phase modulation (PM) and amplitude modulation (AM) phasor-defect detector calculation function used to locate magnetic defects on-the-fly.
47	Magnetic recording medium, magnetic recording apparatus, and servo demodulation circuit	US11476509	2006-06-28	US20070211368A1	2007-09-13	Motomichi Shibano; Haruhiko Izumi
A signal is recorded on a magnetic recording medium by changing a magnetized state of a magnetic member. The magnetic recording medium includes a plurality of servo signal areas in which servo signals for controlling a position of a reproducing head are recorded with different recording frequencies in parallel to a predetermined track so that the servo signals are read by the reproducing head when the reproducing head reproduces the servo signals along the predetermined track.
48	Position demodulating method and circuit of disk apparatus	US10044403	2002-01-11	US06943970B2	2005-09-13	Kazuhiko Takaishi; Takeyori Hara; Eiji Okamura
Position information PosN and PosQ are compared and position information Pos1 and Pos2 in which influences of an error of a position sensitivity gain appear oppositely are calculated. Subsequently, a weight gain G1=M and a weight gain G2=(1−M) are obtained from the position information Pos1. A multiplication value obtained by multiplying the third position information Pos1 by the weight gain G1 and a multiplication value obtained by multiplying the fourth position information Pos2 by the weight gain G2 are added and synthesized, thereby calculating a decoded position.
49	Double-attribute method of encoding and decoding magnetic data	US10919821	2004-08-17	US06922297B2	2005-07-26	Kyle Kendrick Kirby
A method of encoding and decoding data involving the simultaneous application of pulse width modulation and pulse position modulation systems to data intended for storage on a magnetic disk medium.
50	Gray code decoding circuit of a hard disk drive	US853799	1997-05-09	US5920440A	1999-07-06	Ho-Yul Bang
A gray code decoding circuit of a hard disk drive includes a servo pattern area, a data pick-up device, and a pattern detecting device. The servo pattern area has data recorded as a gray code. The data pick-up device detects the recorded data, converts it into encoded read data, and outputs the encoded read data. The pattern detecting device detects a position of the servo pattern area in response to the encoded read data and outputs a reference pulse. The gray code decoding circuit also contains a gray window generating device, a synchronous signal generating device, a gray code extracting device, and a gray-binary converting device. The gray window generating device divides the encoded read data by a division ratio, converts the divided encoded read data into gray data, outputs the gray data, and generates a first synchronous signal after counting by a system clock to a first value. The synchronous signal generating device outputs first and second window signals in response to a second synchronous signal. The gray code data extracting device outputs the second synchronous signal to the synchronous signal generating device and outputs first and second information data taken from the gray data in response to the first and second window signals, respectively. The gray-binary converting device converts the gray code of the first and second information data to a binary code.
51	Method and apparatus for converting a binary signal	US58335	1987-06-04	US4847702A	1989-07-11	Julien Piot; Marcel Schneider; Thomas Saner
In order to reduce the current supply and thus the heating up of relevant components during the processing of binary signals of any desired pulse duration or width, the pulses forming the binary or first signal are converted into a pulsed or second signal which forms a pulse sequence or train consisting of short pulses having different polarities. The individual pulses of the binary signal are converted to short pulses having a first spacing in the pulsed or second signal. The transitions between the pulses of the binary or first signal are converted to pulses having any desired shortened second spacing as compared to the first spacing.
52	PCM Signal system	US273373	1981-06-15	US4425644A	1984-01-10	Werner Scholz
In a system for processing PCM signals and transmitting such signals over a channel, which system includes an input portion having a circuit for interleaving arriving data words and supplying the interleaved words to the input end of the channel, and an output portion having a circuit for de-interleaving the data words arriving at the output end of the channel so that the data words, after de-interleaving, are present in the sequence existing before interleaving, the interleaving circuit performs two successive interleaving operations on the arriving data words, and the de-interleaving circuit operates in a manner to complement the interleaving circuit.
53	Magnetic recording system	US177721	1980-08-12	US4390907A	1983-06-28	Tatsuo Fujiwara
A carrier wave at a frequency higher than the frequency of an input signal to be recorded is pulse width modulated with the input signal at the pulse width modulator, and the modulated signal thus obtained is supplied to a vertical magnetization recording head. The vertical magnetization recording head is held in contact with a magnetic tape having a rectangular hysteresis characteristic, and the modulated signal is recorded by vertical magnetization recording on the magnetic tape. The signal recorded by the vertical magnetization recording is reproduced with a reproducing head having a high sensitivity reproducing characteristic with respect to the input signal component of the pulse width modulation signal recorded on the recording medium and a low sensitivity characteristic with respect to the carrier wave component of the modulation signal.
54	Data or audio recording and playback apparatus	US3797038D	1971-04-29	US3797038A	1974-03-12	BRANDER R
Apparatus for recording and playing back either data or audio signals by use of modified pulse width modulation techniques. Triangular-shaped signals produced by a carrier generator are combined with data signals in a modulator to produce width modulated pulses containing data information that are recorded by a record head. Pulses containing audio information are also produced in the foregoing manner. However, the pulses are modified by use of a waveform modifying device that causes the peak value of the current conducted through the record head to vary in proportion to the width of the pulses produced by modulation. Recorded audio signals are picked up by a playback head and passed through an integrating amplifier and a shaper circuit which correct the frequency response characteristic of the record-playback process and reproduce the original audio signals. Recorded pulses containing data information are also played back through the playback head, integrating amplifier and shaper circuit to partially reconstruct the width modulated pulses originally produced for recording purposes. A restoring circuit that reduces the transition time of the partially reconstructed pulses is also employed. The pulses produced by the restoring circuit are filtered by a low pass filter to reproduce the original data signals.
55	Data recording system wherein data and reference pulse spacing is characteristic of the intelligence	US19334462	1962-05-08	US3212076A	1965-10-12	GUERTH FRITZ A

56	A METHOD FOR RECORDING AND PLAYING BACK INFORMATION ON MAGNETIC STRIPS AND RELATED READING/RECORDING APPARATUS	EP96937237.4	1996-10-25	EP0886855B1	2000-04-19	Zanetti, Giancarlo
A method for recording and playing back an audio and/or video signal (and associated recording and playback apparatus, comprises: A) converting an audio and/or video signal into a first series of samples, achieved by sampling at a predetermined frequency and writing to a read/write memory (46), B) forming, by the later reading of the samples from memory at a frequency that is different from that of writing and is possibly variable, a recording on a magnetic strip (43) associated with a succession of timing marks (34) which identify recording blocks and a predetermined time T for playback of each block, C) obtaining, by reading the recording and the associated succession of timing marks, a second series of samples which are written to the memory in order, and a timing signal, D) applying the second series of samples read from the memory in an order correlated with that of writing, through a filter, to a transducer, the sampling frequency of the recording or reading of the samples from memory, which varies over time, being determined by the timing signal, in such a way that each recording block is played back in the time T.
57	A METHOD FOR RECORDING AND PLAYING BACK INFORMATION ON MAGNETIC STRIPS AND RELATED READING/RECORDING APPARATUS	EP96937237	1996-10-25	EP0886855A1	1998-12-30	ZANETTI GIANCARLO
A method for recording and playing back an audio and/or video signal (and associated recording and playback apparatus, comprises: A) converting an audio and/or video signal into a first series of samples, achieved by sampling at a predetermined frequency and writing to a read/write memory (46), B) forming, by the later reading of the samples from memory at a frequency that is different from that of writing and is possibly variable, a recording on a magnetic strip (43) associated with a succession of timing marks (34) which identify recording blocks and a predetermined time T for playback of each block, C) obtaining, by reading the recording and the associated succession of timing marks, a second series of samples which are written to the memory in order, and a timing signal, D) applying the second series of samples read from the memory in an order correlated with that of writing, through a filter, to a transducer, the sampling frequency of the recording or reading of the samples from memory, which varies over time, being determined by the timing signal, in such a way that each recording block is played back in the time T.
58	Information signal recording and playback method and apparatus therefor	EP89120183.2	1989-10-31	EP0367217B1	1997-01-02	Saito, Seiichi; Takeuchi, Toshifumi; Nakamura, Masafumi; Shiokawa, Junji; Kawamae, Osamu

59	Magnetic recording system	EP80105007.1	1980-08-22	EP0025885A1	1981-04-01	Fujiwara, Tatsuo
A carrier wave at a frequency higher than the frequency of an input signal to be recorded is pulse width modulated with the input signal at the pulse width modulator (2), and the modulated signal thus obtained is supplied to a vertical magnetization recording head (4). The vertical magnetization recording head (4) is held in contact with a magnetic tape (5) having a rectangular hysteresis characteristic, and the modulated signal is recorded by vertical magnetization recording on the magnetic tape (5). The signal recorded by the vertical magnetization recording is reproduced with a reproducing head (6) having a high sensitivity reproducing characteristic with respect to the input signal component of the pulse width modulation signal recorded on the recording medium (5b) and a low sensitivity characteristic with respect to the carrier wave component of the modulation signal.
60	SIGNAL PROCESSING DEVICE, SIGNAL PROCESSING METHOD AND PROGRAM	EP18792059.0	2018-04-12	EP3618312B9	2021-08-18	FUKUI Takao

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