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Class Information
Number: 369/124.15
Name: Dynamic information storage or retrieval > Specific detail of information handling portion of system > Radiation beam modification of or by storage medium > With details of electrical signal processing > Level detecting using reference signal
Description: Subject matter including step or structure to detect an amplitude of an information signal by comparison with a signal that provides a measuring standard.

Patents under this class:
1 2 3 4

Patent Number Title Of Patent Date Issued
5706267 Method and apparatus for retrieving data from a storage device Jan. 6, 1998
5689487 Verify-while-recording device for optical disk recording apparatus Nov. 18, 1997
5684772 Magneto-optical disc recording and reproducing system with level clamping Nov. 4, 1997
5680383 Data-transition threshold following in optical recording Oct. 21, 1997
5661709 Digital signal detection circuit Aug. 26, 1997
5629921 Level detector for detecting a voltage level of a signal May. 13, 1997
5629914 Data-transition threshold following in optical recording May. 13, 1997
5606538 Learning type signal recording and reproducing apparatus Feb. 25, 1997
5598389 Signal detector for an optical information reproducing apparatus Jan. 28, 1997
5598392 Data reproduction system synchronized by recording data Jan. 28, 1997
5596559 Information reproducing apparatus for reproducing digital information by self-clock scheme Jan. 21, 1997
5574709 Automatic gain control system and information reproduction apparatus using it Nov. 12, 1996
5563863 Information reproducing method and apparatus for reproducing digital information by determining the information in multiple bit units based on binarizer output signals Oct. 8, 1996
5517476 Digital signal reproducing apparatus using a viterbi decoder May. 14, 1996
5506827 Digital data reproducing apparatus Apr. 9, 1996
5497361 Information reproducing apparatus with a DC level correcting capability Mar. 5, 1996
5475672 Variable-length information recording with reference marks for time reference during information reading Dec. 12, 1995
5469415 Optical information recording or reproducing apparatus with asymmetry compensation Nov. 21, 1995
5467331 Recording and reproducing apparatus having arrangement for recovery of read-out data error Nov. 14, 1995
5459704 Optical reader for record carriers with different information densities Oct. 17, 1995
5455813 Digital signal reproducing apparatus Oct. 3, 1995
5453971 Recorded area detection to prevent information overwriting Sep. 26, 1995
5452279 Information recording/reproducing apparatus for recording and reproducing information in accordance with mark interval recording scheme or mark length recording scheme Sep. 19, 1995
5446717 Optical disc and recording and reproducing method for an optical disc with a high density Aug. 29, 1995
5444688 Information reproducing circuit Aug. 22, 1995
5430702 Calibration of readback threshold in an optical storage device Jul. 4, 1995
5412632 Information reproducing apparatus with a DC level correcting capability May. 2, 1995
5408456 Data reproducing method and apparatus for determining the interval between pits on a recording medium from a modulated read-out signal Apr. 18, 1995
5400318 Edge detection of information pit pattern by establishing threshold voltage from a closely spaced pit pattern Mar. 21, 1995
5398228 Photo-detecting device for reproducing information recorded on an optical disk Mar. 14, 1995
5396479 Apparatus and method for setting a threshold level to maintain duty cycle in a pulse width modulated optical recording system Mar. 7, 1995
5392270 Information recording reproducing apparatus using data conversion to provide for accurate reproduction of high density recording using an optical recording medium Feb. 21, 1995
5392268 Optical recording/reproducing apparatus for reproducing information of multiple tracks capable of correcting uneven illumination of the multiple tracks Feb. 21, 1995
5339303 Apparatus for reproducing information from optical disk on which information in recorded by mark length recording Aug. 16, 1994
5295130 Apparatus and method for signal reproduction Mar. 15, 1994
5237559 Reproduction of sound track signals by varying the detector threshold level as a function of the transverse scan position Aug. 17, 1993
5233589 Method for recording/reproducing information having a function of correcting variations in the interval in reproduced data and apparatus for realizing same Aug. 3, 1993
5231627 Apparatus for reading optically encoded soundtracks Jul. 27, 1993
5229985 Data recording/reproducing apparatus capable of detecting data recording state Jul. 20, 1993
5206853 Apparatus and method for detecting intersymbol interference Apr. 27, 1993
5204848 Adjusting amplitude detection threshold by feeding back timing-data phase errors Apr. 20, 1993
5164933 Reading signal processing circuit in optical information reproducing apparatus Nov. 17, 1992
5151891 Method and apparatus for assigning binary values to sample values of a waveform representing a pattern of recording marks on a record carrier Sep. 29, 1992
5134607 Optical memory system for generating a timing control signal for detecting a recorded region through a playback signal Jul. 28, 1992
4999824 Magneto-optical memory device Mar. 12, 1991
4961182 Information retrieving system with level clamping Oct. 2, 1990
4939710 Optical magnetic memory device utilizing non-recorded portions of recording medium to represent data Jul. 3, 1990
4847824 Readback circuits for magnetooptic players Jul. 11, 1989
4845701 Optical disc player for optically reproducing recorded information on an optical information disc into an RF signal Jul. 4, 1989
4743774 Method and apparatus for optical detection of information May. 10, 1988

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