Class / Patent application number | Description | Number of patent applications / Date published |
369470250 | For gain processing | 18 |
20090073830 | REPRODUCING APPARATUS AND REPRODUCTION METHOD - A reproducing apparatus includes the following elements. A reproducing head unit irradiates an optical disk with a laser beam to obtain a reproduced signal. An offset cancellation circuit cancels an offset element of the reproduced signal. An automatic gain control circuit adjusts the amplitude of the reproduced signal processed through the offset cancellation circuit. A band switching control unit detects a fingerprint period during which the reproduced signal is affected by a fingerprint on the surface of the optical disk and, for the fingerprint period, switches a frequency band in which the offset cancellation circuit and the automatic gain control circuit function to a higher frequency band than that associated with a non-fingerprint period. A decoding unit decodes the reproduced signal processed through the automatic gain control circuit to output binary data. A data reproduction processing unit performs reproduction processing on the binary data to obtain reproduced data. | 03-19-2009 |
20090213710 | REPRODUCING INFORMATION FROM ANINFORMATION CARRIER - The invention described is an apparatus for reproducing information from an information carrier ( | 08-27-2009 |
20100135135 | SYSTEM OF SAMPLING INTERFACE FOR AN OPTICAL PICK-UP HEAD - A system of sampling interface for an optical pick-up head comprises an optical pick-up head, a PMOS, a boost circuit, and a sample and hold circuit. The optical pick-up head outputs one of a reading voltage and a writing voltage. The PMOS gate receives the gate voltage and then the PMOS is turned on to pass the reading voltage to the sample and hold circuit. Moreover, the substrate of the PMOS receives a control voltage. The boost circuit is used to boost the gate voltage higher than the control voltage for turning off the PMOS and isolating the writing voltage. | 06-03-2010 |
20100157758 | Comparator and optical-disc recording/reproduction apparatus - A comparator includes a variable-gain amplifier circuit configured to vary an amplitude of an input signal by changing a gain in accordance with a control signal, and a comparison section configured to compare a slice level interlocked with a signal level received from the variable-gain amplifier circuit with an output signal received from the variable-gain amplifier circuit and generate an output signal in accordance with a comparison result. | 06-24-2010 |
20100208560 | Optical disk playback apparatus and optical disk recording/playback apparatus - Disclosed herein is an optical disk playback apparatus including: a signal playback device configured to read and decode information recorded to an optical disk through an optical pickup unit in order to reproduce the information; the signal playback device including a signal generation circuit, a first signal processing device, a second signal processing device, a modulator, a switch, an analog to digital converter, and a third signal processing device. | 08-19-2010 |
20100226224 | DISC DRIVE AND PHOTO-DETECTOR GAIN SELECTION METHOD - The present invention relates to a method of selecting a range of gain values ( | 09-09-2010 |
20100315919 | CURRENT GAIN CONTROL SYSTEM - A current gain control system is described and comprises first and second gain blocks respectively associated with the first and second input channels, wherein first and second gain blocks transmit first and second gain signals in response to receiving first and second input signals; first and second converters adapted to be respectively coupled to the first and second gain blocks, the first and second converters operative for setting gains associated with the first and second input channel and for transmitting first and second converted signals in response to receiving the first and second gain signals; and first and second switches for selectively coupling the first and second converters to first and second channel drivers, respectively, wherein the first and second channel drivers transmit channel gain signals in response to receiving the first converted signal, and the channel gain signal allows control of the gain associated with the input channel. | 12-16-2010 |
20110273974 | METHOD AND APPARATUS FOR OFFSET AND GAIN CORRECTION - Aspects of the disclosure provide a signal processing circuit that has fast response time to sudden profile changes in an electrical signal. The signal processing circuit includes a processing path configured to process an electrical signal that is generated in response to reading data on a storage medium, and a feed-forward correction module. The feed-forward correction module is configured to detect a profile variation based the electrical signal in a time window, and correct the electrical signal in the time window based on the detected profile variation. | 11-10-2011 |
20120014237 | OPTICAL DISC DEVICE - A first signal is detected from the central part of a light beam returning from a super-resolution optical disc; a second signal is detected from a peripheral part in a direction corresponding to a track on the super-resolution optical disc; a gain adjustment unit is provided to adjust the amplitude of the first signal; a subtraction unit is provided to generate a third signal by subtracting, from the second signal, the first signal with the amplitude adjusted by the gain adjustment unit; and an unit is provided to generate a reproduced signal by combining the first signal and a signal obtained by delaying the third signal. | 01-19-2012 |
20120044793 | RECORDING DEVICE AND OPTICAL OSCILLATOR DEVICE - A recording device that records information in an optical recording medium includes: a self excited oscillation semiconductor laser including a saturable absorber section to apply a bias voltage and a gain section to inject a gain current, and also emitting a laser light to record the information in the optical recording medium; a reference signal generation unit generating a master clock signal and also supplying an injection signal synchronized with the master clock signal to the gain section of the self excited oscillation semiconductor laser; and a recording signal generation unit generating a recording signal based upon the master clock signal and also applying the recording signal to the saturable absorber section of the self excited oscillation semiconductor laser as the bias voltage. | 02-23-2012 |
20130100789 | RECORDING DEVICE AND OPTICAL OSCILLATOR DEVICE - A recording device that records information in an optical recording medium includes: a self excited oscillation semiconductor laser including a saturable absorber section to apply a bias voltage and a gain section to inject a gain current, and also emitting a laser light to record the information in the optical recording medium; a reference signal generation unit generating a master clock signal and also supplying an injection signal synchronized with the master clock signal to the gain section of the self excited oscillation semiconductor laser; and a recording signal generation unit generating a recording signal based upon the master clock signal and also applying the recording signal to the saturable absorber section of the self excited oscillation semiconductor laser as the bias voltage. | 04-25-2013 |
20140112117 | OPTICAL DISC DEVICE AND OPTICAL DISC REPRODUCTION METHOD - An optical disc device is configured to reproduce an optical disc. The optical disc device includes an optical pickup, a high-frequency production component, a driver and a controller. The optical pickup includes a laser emission component configured to emit a laser beam, and a light receiver configured to receive returning light of the laser beam. The high-frequency production component is configured to produce a high-frequency signal. The driver is configured to produces a drive signal for driving the laser emission component by superposing the high-frequency signal produced by the high-frequency production component onto a specific drive signal. The controller is configured to control the high-frequency production component to adjust an amplitude of the high-frequency signal. | 04-24-2014 |
20140126342 | METHOD AND APPARATUS FOR OFFSET AND GAIN CORRECTION - Aspects of the disclosure provide a signal processing circuit that has fast response time to sudden profile changes in an electrical signal. The signal processing circuit includes a processing path configured to process an electrical signal that is generated in response to reading data on a storage medium, and a feed-forward correction module. The feed-forward correction module is configured to detect a profile variation based the electrical signal in a time window, and correct the electrical signal in the time window based on the detected profile variation. | 05-08-2014 |
369470260 | Within a frequency band | 1 |
20110158068 | OPTICAL DISC DEVICE AND PLAYING METHOD OF OPTICAL DISC - To determine the optimum amplitude of high frequency signal for the loaded disc with a simple configuration to achieve stable playing performance, there is provided an optical disc device comprising: a light source driven by a drive signal with a high frequency signal superimposed; a detector for detecting return light emitted from the light source; and a controller for controlling amplitude of the high frequency signal to be superimposed on the drive signal for the light source; the optical disc device being configured to read data on an optical disc loaded therein by a signal outputted from the detector, wherein the controller determines the amplitude of the high frequency signal to be superimposed on the drive signal based on asymmetry of the signal outputted from the detector. | 06-30-2011 |
369470270 | Using a reproduced information of specified preformat, header, or reference area | 4 |
20080316881 | Recording Apparatus and Recording Method, Reproducing Apparatus and Reproducing Method, and Program - The present invention relates a recording apparatus and a recording method, a reproducing apparatus and a reproducing method, and a program that make it possible to easily judge whether data was recorded in a recording medium by an apparatus of own model. An own model/another model information generating unit | 12-25-2008 |
20100271915 | SYSTEM AND METHOD FOR GENERATING OUTPUT SIGNALS INDICATING SPECIFIC AREAS ON AN OPTICAL DISC UTILIZING A PROTECTION MEANS - A system for generating an output signal indicating a specific area on an optical disc is disclosed. The system includes: a detecting circuit, a header signal generator, a protection circuit, a counter and an output signal generator. The detecting circuit detects pre-recorded address information on the optical disc to generate a detection signal. The header signal generator detects headers on the optical disc to generate a header signal. The protection circuit computes a first counter value and reloads the first counter value according to the detection signal and the header signal, wherein the protection circuit does not reload the first counter value twice successively due to the header signal. The counter computes a second counter value and reloads the second counter value according to the first counter value. The output signal generator generates the output signal according to the first counter value. | 10-28-2010 |
20120155236 | RECORDING AND/OR REPRODUCING APPARATUS, RECORDING AND/OR REPRODUCING METHOD AND INFORMATION STORAGE MEDIUM THEREFOR - A recording and/or reproducing apparatus, a recording and/or reproducing method, and an information storage medium, wherein the recording and/or reproducing apparatus includes: a writing and/or reading unit writing data to or reading data from an information storage medium having one or more information recording layers; and a control unit controlling the writing and/or reading unit to write the data to the information storage medium by referring to one or more disk information structures including recording related parameter information corresponding to recording characteristics of the information storage medium, and recording characteristic information to which the recording related parameters are applied. According to the apparatus and method, parameters of recording characteristics appropriate to a recording and/or reproducing apparatus and compatibility between different specifications can be achieved. | 06-21-2012 |
20120176876 | METHOD AND APPARATUS FOR DETECTING LAND PRE-PITS - Aspects of the disclosure provide a method for detecting land pre-pits. The method includes extracting a land pre-pit data stream from a signal responsive to land pre-pits on an optical medium based on a land pre-pit threshold, detecting a bit stream pattern from the land pre-pit data stream, comparing one or more bits in the land pre-pit data stream at locations relative to the bit stream pattern with pre-known bit information, and adjusting the land pre-pit threshold based on the comparison. | 07-12-2012 |