Via Technologies, Inc.

Other

Princeton Technology Corporation

Via Optical Solution, Inc.

Sung-Hung Li

Yi-Lin Lai

Ting-Wen Su

Wei-Chih Huang

Te-Ju Wang

Steven Su

Hsin-Chieh Lin

An AV player chip includes a TV encoder, a timing controller, a multiplexer and a plurality of digital-to-analog converters. The TV encoder is used for transforming a first image signal into a TV video signal. The timing controller is used for generating an output signal. The multiplexer includes a first set of input ends coupled to the TV encoder, a second set of input ends coupled to the timing controller, a control end and a set of output ends. The multiplexer outputs the TV video signal or the output signal to the set of output ends according to a control signal received by the control end. The plurality of digital-to-analog converters are coupled to the set of output ends of the multiplexer for transforming the TV video signal into a first playing signal and for transforming the output signal into a second playing signal.

AV player chip, AV system, and related method utilizing a multiplexer for sharing digital-to-analog converters

A wobble signal generating apparatus of an optical-electronic system. A first operation unit for generating a reference signal in response to a first input signal and a second input signal that are derived from a plurality of light signals reflected from an optical storage medium is provided. The plurality of reflected light signals is used for generating the reference signal even when the optical-electronic system is recording data onto the optical storage medium. A processing unit processes the reference signal to generate the wobble signal.

Method and apparatus for generating wobble signal

A method of determining whether an optical pick-up of an optical device passes through a data track of a storage device during track-seeking based on a radio frequency (RF) signal, a radio frequency zero cross (RFZC) signal radio and a track-seeking signal of the optical device. When the optical pick-up of the optical device passes through a data track of the storage device during track-seeking, a trigger signal is sent to a data phase locked loop of the optical device for frequency and phase adjustment. The method can activate the data phase locked loop of the optical device while the optical device is performing track-seeking.

Method of activating a data phase locked loop during track-seeking and apparatus of operating the same

An apparatus and method for controlling an operation of recording data employed in an optical storage system is disclosed. The apparatus has a sampling-and-holding circuit, an operational amplifier, a plurality of gain amplifiers, and a plurality of switches. The apparatus operates under a short-term open mode, a long-term open mode, and a closed-loop mode sequentially in response to control signals and close/open statuses of the switches. A write-control signal is initialized by using a virtual ground effect within the short-term mode. In the long-term mode, the write-control signal is charged to a voltage level suitable for recording data onto a compact disk, while the charged write-control signal is employed to record data on the compact disk within the closed-loop mode.

Apparatus and method for controlling data write operations in optical storage system

An apparatus and related operating method for generating slice levels adapted to an optical system is disclosed. The apparatus basically encompasses a multiplexer, a low-pass filter, a digital signal processor (DSP), a digital-to-analog converter, and a comparator. In the beginning of the track-crossing operation, the optical system will enter the first DAC mode that a pre-stored slice level derived from a calibration process is accessed and converted by the digital-to-analog converter before being referred as the slice level in the first DAC mode. When the low-pass filter can follow the RFRP signal variations, the low-pass filter is used to receive the RFRP signal and derive the slice level in the low-pass-filter mode. When a track-on command is given, the optical system will enter the second DAC mode and find an average value of the last peak-hold and bottom-hold values derived at the end of the low-pass-filter mode. The average value will be frozen and referred as the slice level in the second DAC mode, and even in the following mode after the current track-crossing operation.

Apparatus and method for generating RFZC signal for optical systems

A method for protecting a phase lock loop (PLL) in an optical system is disclosed. The disclosed method will determine whether the currently reading data is erroneous and then maintain the frequency currently locked by the PLL circuit when the waveform lengths of the EFM signal in a detecting window contain at least one waveform length longer than 11T and at least one waveform length shorter than 3T. Otherwise, the PLL circuit will adjust the locked frequency according to the waveform length of the detected EFM signal so that the system clock frequency can be adjusted based on the locked one. In addition, when the optical system seeks tracks for reading required data under a constant angular velocity (CAV) modulation mode, the PLL circuit will increase the locked frequency gradually as the pick-up head moves towards the outer tracks of the optical disc, and decrease the locked frequency gradually as the pick-up head moves towards the inner tracks of the optical disc. Time cost for adjusting the system clock frequency can be significantly decreased based on the disclosed method.

Method for protecting phase lock loop in optical system

The disclosed invention provides a tracking method of an optical storage. When proceeding with tracking, the optical pickup head can be moved constantly and the TE signal can be detected. Then differentiation of the TE signal is obtained. If the differentiation is less than 0, then the TE signal is masked; otherwise, the TE signal is not masked. Therefore, the TE Hysteresis signal can be determined by the TE signal and its differentiation. The TE Hysteresis signal of 0 represents that the laser beam is in the Pit, and then the tracking procedure is finished. Otherwise, the aforementioned steps are repeated until the end of the tracking procedure.

Tracking method in an optical storage

A device and method for measuring the jitters of phase locked loop signals. A phase lead or phase lag relationship between an input signal and an output signal of a phase locked loop is found. According to the phase relationship and using multiplexers, a first phase difference signal and a second phase difference signal are re-routed to a subtraction unit and produces a jitter-level output signal. The jitter-level output signal represents the absolute value of the difference of pulse width between the first phase difference signal and the second phase difference signal.

Device and method for measuring jitter in phase locked loops

The invention provides a method of adjusting a tracking location in an optical storage device. The method is illustrated as follows. Firstly, the optical pickup head reaches the first tracking location according to a tracking error (TE) signal. Secondly, the optical pickup head is finely moved to an adjusted tracking location where the value of the amplitude of RFRP signal is maximum. The method can avoid wrong tracking location by simply based on the TE signal, then enable the optical pickup head to reach the correct track center and improve the quality of data reading.

Growing community of inventors

Junghe, Taiwan

Sung-Hung Li