55results about How to "Improve output signal quality" patented technology

An apparatus and a method for raising an output efficiency in a mobile communication terminal are provided. The apparatus includes a supply modulator and a power amplifier. The supply modulator includes a DC-DC converter, a voltage regulator, and a switching regulator. The supply modulator modulates an envelope component of an input signal to generate power. The power amplifier amplifies a phase component of the input signal using the power generated by the supply modulator as a power source of a collector / drain. The DC-DC converter raises battery power of the mobile communication terminal. The voltage regulator determines an output voltage of the supply modulator using the power raised by the DC-DC converter. The switching regulator determines an output current of the supply regulator using the battery power of the mobile communication terminal.

A method and an apparatus for compensating for nonlinear distortion are provided to divide audio signals reproduced in a nonlinear speaker system into linear and nonlinear components in a time domain and a frequency domain, and then generate inversely-corrected signals by means of an inverse filtering scheme, so that it is possible to further consider a variety of nonlinear distortion characteristics such as viscous damping and structural damping which have not been reflected in the conventional lumped parameter method, and thus to obtain better sound quality.

This invention discloses an improvement to a digital Acoustic Echo Control (AEC) in hands-free telephones. It describes an additional adaptive filter referred to as a residual echo filter, which is placed after the usual echo canceller and it is used to efficiently and accurately estimate a residual echo signal b(i) and a system coupling factor β(i), which can be utilized to establish an efficient control for the AEC system and construct the appropriate filters. The invention also describes a control block means performing a joint operation control of the echo canceller, residual echo suppressor and residual echo filter for achieving more consistent echo cancellation results and enhancing output signal quality.

A position-measuring device includes a measuring graduation extending along a measuring direction, a scanning unit for scanning the measuring graduation, and a detection device of the scanning unit including a plurality of detector elements that are arranged periodically one after the other along an extension direction and that, during scanning of the measuring graduation, generate output signals able to be supplied to an evaluation unit. In each case, a plurality of adjacent detector elements are interconnected to form a detector group such that their output signals are able to be joined and supplied as a unified signal to the evaluation unit. The detector elements are combined to form detector groups, and are arranged in the form of detector groups one after the other along the extension direction such that at least one defined harmonic is eliminated from the output signals.

A rotation detecting apparatus capable of increasing the angle detecting precision without being affected by an offset signal resulting from a stress in a silicon chip. The rotation detecting apparatus includes a magnetic sensor array and a magnet rotatable in face-to-face relation with the magnetic sensor array. The magnetic sensor array includes a plurality of groups of sensor elements, each group including four sensor elements. The four sensor elements of each combined sensor element group are so arranged as to be oriented vertically and horizontally in four directions and connected parallel to each other.

The invention relates to a method and a system for edge-adaptive frame rate up-conversion. One embodiment of the system of the invention comprises a capture block; a frame buffer; an edge-adaptive interpolator; a motion detector; a blender for receiving a prior input field signal from the frame buffer, an interpolated field signal from the edge-adaptive interpolator, and a motion signal, and generating an edge and motion-interpolated field signal; a synchronization control block for processing an input vertical synchronization signal received from the capture block and generating an output synchronization signal and an output field parity signal; a comparator for receiving and comparing the output field parity signal and an input field parity signal output from the capture block; and a multiplexer for selecting, based on the output of the comparator, and providing as an up-converted output signal, either one of the set of current input field signals output from the frame buffer or the edge and motion-interpolated field signal.

The invention discloses a tera-hertz silica-based quadrupler and a frequency multiplier, belonging to the field of RFIC (Radio Frequency Integrated Circuit). The quadrupler comprises transistors (M1 and M2) and transmission lines (L1, L2 and L-1), wherein the drain ends of the transistors (M1 and M2) are respectively connected to an output port through the transmission lines (L1 and L2), source ends are connected with a ground line, grid ends are respectively connected with the signal input ends of an path (I) and the path (Q) of a baseband signal (f0); the transmission line (L-1) is connected between the output port and a power supply; and the length of the transmission lines (L1 and L2) are 1 / 4 of that of the corresponding wavelength of a signal (2f0), the length of the transmission line (L-1) is 1 / 4 of that of the corresponding wavelength of a signal (4f0). The multi-frequency multiplier comprises a 2n frequency multiplier (1), a 2n frequency multiplier (2) and a transmission line (L), wherein the output ports of the 2n frequency multiplier (1) and the 2n frequency multiplier (2) are connected to be used as the output port of a 2n+1 frequency multiplier, the transmission line (L) is connected between the output port of the 2n+1 frequency multiplier and the power supply, and the length of the transmission line (L) is 1 / 4 of that of the corresponding wavelength of a signal (2n+1f0). The tera-hertz silica-based quadrupler and the multi-frequency multiplier, provided by invention, have the advantages of high output frequency, pure frequency spectrum, low power consumption and easiness for integration.

A method and a device for clipping control are provided in the present invention. The method includes: updating a clipping factor according to a maximum absolute value FrameLev in a current frame signal; obtaining a clipping restoration filter according to the clipping factor; filtering the current frame signal according to the clipping restoration filter to obtain a filtered clipping restoration signal. With the method and device for clipping control provided in the present invention, whether a clipping phenomenon occurs may be automatically detected, and clipping restoration is performed, so that subjective quality of an output signal is improved.

A voltage converter is disclosed. The voltage converter includes a constant on time signal generator, a first and second transistors, an inductor, a feedback circuit and a ripple injection circuit. The constant on time signal generator generates a first and second driving signals for driving the first and second transistors. The voltage converter generates an output signal at an output end thereof. The feedback circuit divides the output signal to generate a feedback signal at a feedback end of the voltage converter. The ripple injection circuit gets the voltage of the feedback end and the voltage of the phase end to generate a injection signal. The constant on time signal generator generates the first and second driving signals according to the injection signal, the output signal and a reference signal.

The invention relates to an integrated circuit arrangement (10) comprising at least one digital-analogue converter (12) with a multitude of current-source transistors (N1-N8) arranged parallel to each other for providing current components (I1-I8) that in each case are predetermined in a fixed manner and are used to form an analogue current signal, wherein control inputs of the current-source transistors (N1-N8) can be subjected to a shared adjustment potential by way of an adjustment potential line (14), which adjustment potential defines the individual current components (I1-I8), and comprising an adjustment circuit (16) for providing the adjustment potential at the adjustment potential line (14). In order to drastically reduce interference, in particular noise, in the individual current components (I1-I8), the integrated circuit arrangement (10) comprises an external connection (18), which is connected to the adjustment potential line (14) for connecting an external capacitor (C0).

The invention discloses a portable giant magnetostrictive source device, which includes an impact output rod, a guide head guard, a pre-compressed stress adjustment plate, a giant magnetostrictive rod, a driving coil, an impact control circuit, a power supply module, and the impact control circuit and The driving coil is connected to the power supply module, the impact control circuit and the power supply module are installed in the shell, the impact output rod is connected with the guide guard, the shell, and the back cover in turn, the impact output rod is fixed by the guide guard, and the guide guard is a cone The bottom surface of the guide guard is connected to one end of the shell, and the giant magnetostrictive rod and the impact output rod are connected through a screw thread. The impact control circuit is placed in the middle of the cavity and connected with the driving coil and the power supply module. The power supply module is placed at the rear end of the cavity and connected with the driving coil and the impact control circuit. The invention improves the portability of the device, reduces the charging time, enhances the signal quality of the seismic source, improves the detection work efficiency, and is convenient for on-site operation and use.