Abstract: An analog-to-digital conversion device and a method thereof are provided. The analog-to-digital conversion device includes a first level adjustment unit, an analog-to-digital converter (ADC), and a linear range detection unit. The ADC converts a test signal or a first input signal to generate a test data stream or a first output data stream. In an adjustment mode, the linear range detection unit obtains a conversion curve of the ADC by using the test data stream and determines whether to adjust offset control information according to a linear range of the conversion curve. In an operation mode, the linear range detection unit continues outputting the offset control information. Additionally, before transmitting the first input signal, the first level adjustment unit adjusts a direct-current level of the first input signal according to the offset control information to allow the first input signal to be within the linear range of the conversion curve.

Abstract: A data recovery method includes the following steps. Firstly, plural sampling values are classified into a first group, a second group, a third group and a fourth group. A first channel estimation value and a second channel estimation value are generated according to the sampling values of the second group and the third group. A judging step is performed to judge whether a first sampling value of the first group is lower than the first channel estimation value or a second sampling value of the fourth group is higher than the second channel estimation value. If the judging condition is satisfied, a polarity of the first sampling value or the second sampling value is changed and then the plural sampling values are outputted. If the judging condition is not satisfied, the plural sampling values are directly outputted.

Abstract: An analog-to-digital conversion device and a method thereof are provided. The analog-to-digital conversion device includes a first level adjustment unit, an analog-to-digital converter (ADC), and a linear range detection unit. The ADC converts a test signal or a first input signal to generate a test data stream or a first output data stream. In an adjustment mode, the linear range detection unit obtains a conversion curve of the ADC by using the test data stream and determines whether to adjust offset control information according to a linear range of the conversion curve. In an operation mode, the linear range detection unit continues outputting the offset control information. Additionally, before transmitting the first input signal, the first level adjustment unit adjusts a direct-current level of the first input signal according to the offset control information to allow the first input signal to be within the linear range of the conversion curve.

Abstract: A data recovery device including a filter, a tilt detection unit, a tilt cancellation unit and a data conversion unit is provided. The filter filters a radio-frequency data stream to generate an original data stream. The tilt detection unit synthesizes a tangential push-pull data stream by employing a first to a fourth data streams, and generates a tilt direction signal according to symmetry of a curve composed by the tangential push-pull data stream. The tilt cancellation unit detects a plurality of rising areas and falling areas of the original data stream, and reconstructs a plurality of data points corresponding to the rising areas or falling areas in the original data stream so as to generate a tilt repair data stream. The data conversion unit recovers the tilt repair data stream to a modulation signal.

Abstract: A data recovery device including a filter, a tilt detection unit, a tilt cancellation unit and a data conversion unit is provided. The filter filters a radio-frequency data stream to generate an original data stream. The tilt detection unit synthesizes a tangential push-pull data stream by employing a first to a fourth data streams, and generates a tilt direction signal according to symmetry of a curve composed by the tangential push-pull data stream. The tilt cancellation unit detects a plurality of rising areas and falling areas of the original data stream, and reconstructs a plurality of data points corresponding to the rising areas or falling areas in the original data stream so as to generate a tilt repair data stream. The data conversion unit recovers the tilt repair data stream to a modulation signal.

Abstract: A data recovery method includes the following steps. Firstly, plural sampling values are classified into a first group, a second group, a third group and a fourth group. A first channel estimation value and a second channel estimation value are generated according to the sampling values of the second group and the third group. A judging step is performed to judge whether a first sampling value of the first group is lower than the first channel estimation value or a second sampling value of the fourth group is higher than the second channel estimation value. If the judging condition is satisfied, a polarity of the first sampling value or the second sampling value is changed and then the plural sampling values are outputted. If the judging condition is not satisfied, the plural sampling values are directly outputted.

Abstract: A circuit for generating a tracking error signal is provided. The circuit includes a digitizing circuit, a short signal removing circuit and phase comparator. The digitizing circuit receives first and second pick-up signals outputted from a pick-up head, and respectively compares the first and the second pick-up signals with a reference signal to obtain a first digital signal and a second digital signal. The short signal removing circuit is used for removing pulses in the first and the second digital signals, wherein the pulse width of the removed pulses are shorter than a preset time, and the first and second digital without the removed pulses are respectively served as a first determining signal and a second determining signal. The phase comparator receives the first determining signal and the second determining signal for outputting the tracking error signal according to a phase difference between the first and the second determining signals.

Abstract: A circuit for generating a tracking error signal is provided. The circuit includes a digitizing circuit, a short signal removing circuit and phase comparator. The digitizing circuit receives first and second pick-up signals outputted from a pick-up head, and respectively compares the first and the second pick-up signals with a reference signal to obtain a first digital signal and a second digital signal. The short signal removing circuit is used for removing pulses in the first and the second digital signals, wherein the pulse width of the removed pulses are shorter than a preset time, and the first and second digital without the removed pulses are respectively served as a first determining signal and a second determining signal. The phase comparator receives the first determining signal and the second determining signal for outputting the tracking error signal according to a phase difference between the first and the second determining signals.

Abstract: A circuit for generating a tracking error signal is provided. The circuit includes a digitized circuit, a short signal removing circuit and phase comparator. The digitized circuit receives first and second pick-up signals outputted from a pick-up head, and respectively compares the first and the second pick-up signals with a reference signal to obtain a first digital signal and a second digital signal. The short signal removing circuit is used for removing pulses in the first and the second digital signals, wherein the pulse width of the removed pulses are shorter than a preset time, and the first and second digital without the removed pulses are respectively served as a first determining signal and a second determining signal. The phase comparator receives the first determining signal and the second determining signal for outputting the tracking error signal according to a phase difference between the first and the second determining signals.

Abstract: An asymmetry compensator for a partial response maximum likelihood (PRML) decoder, which is utilized to remove and eliminate the asymmetric component of the regenerating signal read from the optical recording medium, thereby effectively solving the problem of the asymmetry of the optical disk regenerating signal. The compensator includes an offset controller and a gain controller. The offset controller determines the central level of the regenerating signal thus to adjust the offset of the regenerating signal while the gain controller is arranged to adjust the gain of the regenerating signal.

Abstract: A type dependency modulation method with type control is integrated with type control code words in traditional type dependency modulation. It increases the effect of DC component control in the overall encoding procedure. In this method, a specific type-control code word is inserted at certain intervals in the encoding procedure, increasing the selectable code words in subsequent encoding procedures, thereby improving the DC component control ability.

Abstract: A fixing structure for fixing a casing and a base frame of an electronic device together includes: a melt hole disposed in the base frame and a melt post formed on the casing, wherein the melt hole is provided with an opening having its diameter being gradually enlarged from inside outward, so that when combining the casing with the base frame, the melt post passes through the melt hole and is exposed by the opening. Through the design of the opening, the fixing effect upon melting can be strengthened without occupying a lot of space around the melt hole.

Abstract: The present invention proposes an engagement mechanism employed in a first assembly part and a cooperating second assembly part. The engagement mechanism comprises a pivot member assembled in the first assembly part; and an elastic member having a double-wedged surface at an endmost portion thereof which extends outwardly from the projecting portion of the first assembly part. The elastic member is employed to provide an elastic force of maintaining the projecting portion extending outwardly from the first assembly part to engage with the second assembly part. The present invention, via the design of the double-wedged surface of the projecting portion, facilitates easy engagement or disengagement of the engagement mechanism, and overcomes the problem of having to provide extra disengagement arrangement in the prior art.

Abstract: A peripheral fastening structure for fastening an upper case and a lower case of an electronic device is disclosed. The peripheral fastening structure includes a body frame, a first slot, a top stopper, a lower stopper and a second slot. The body frame has an exposed surface, a first region, a second region and a third region. The first slot is formed in the first region and has a first opening for engaging with a periphery of the upper case. The top stopper is formed in the second region and extended toward the upper case and against the periphery of the upper case. The lower stopper is formed in the second region for engaging with a cavity of the lower case. The second slot is formed in the third region and has a second opening for engaging with a supporting bar of the upper case.

Abstract: A circuit for generating a tracking error signal is provided. The circuit includes a digitized circuit, a short signal removing circuit and phase comparator. The digitized circuit receives first and second pick-up signals outputted from a pick-up head, and respectively compares the first and the second pick-up signals with a reference signal to obtain a first digital signal and a second digital signal. The short signal removing circuit is used for removing pulses in the first and the second digital signals, wherein the pulse width of the removed pulses are shorter than a preset time, and the first and second digital without the removed pulses are respectively served as a first determining signal and a second determining signal. The phase comparator receives the first determining signal and the second determining signal for outputting the tracking error signal according to a phase difference between the first and the second determining signals.

Abstract: A fastening mechanism for an electronic device for connecting upper and lower casings of an electronic device, includes: a side frame member including an exposed surface, a first surface and an opposing second surface; a wedging portion formed on the first surface, for being coupled with a protruding edge formed on the upper casing; a stopping portion formed on the second surface, for abutting against an edge of the lower casing; and at least one locking portion formed on the side frame member, and extended toward a direction opposed to the exposed surface so as to further fasten the upper casing, the side frame member and the lower casing by means of a locking element, making the upper casing, the exposed surface of the side frame member and the lower casing form a case of the electronic device.

Abstract: A hard drive connecting device for a notebook PC is installed in a case of the notebook PC for connecting a main board and a hard drive in the case, which includes a flexible board having at least a first side, at least a second side, and conductive lines for electrically connecting the first side to the second side; a first connector located in the hard drive bay electrically connected to the first side for electrically connecting the hard drive; and a second connector electrically connected to the second side for electrically connecting the main board. The flexible board facilitates electrical connection of the hard drive that allows reduction of both the size of the hard drive and the installation space required for the hard drive, thus facilitating profile miniaturization of notebook PCs.

Abstract: A key structure applicable in an electronic device for pressing an electrical button of the electronic device is disclosed. The key structure includes an annulus section for fixing the key structure in the electronic device, and a pair of key sections, each of which extends from the annulus section and has a protruding section and a retention section, wherein the protruding section protrudes out of an inner wall of the key section to prevent the key section from sinking, and the retention section extends from at least one side of the key section to prevent the key section from protruding upwards. With each key section being additionally provided with the protruding section and the retention section, the key structure efficiently prevents the key sections from protruding upwards and sinking.

Abstract: A hinging device for jointing a main body and a display unit of an electronic device is proposed. The hinging device includes a first coupling element coupled to the main body, a second coupling element coupled to the display unit, and a connecting element. The connecting element is formed with a first pivot member, a second pivot member, and a cable holding member. The first and second pivot members are coaxially disposed and pivotally connected to the first and second coupling elements respectively. The cable holding member, interposed between the first and second pivot members, holds at least one cable for connecting the main body and the display unit so as to protect the cable from damage due to rotation of the hinging device.

Abstract: A signal switching apparatus for electronic device is proposed. The switching apparatus includes a switching component, provided in the electronic device, having a control unit for switching the on/off condition of signals, and an operating component having an operating unit exposed from the electronic device and a connecting unit extending to the inside of the electronic device and coupled to the control unit.