Abstract: Disclosed are an apparatus and method for creating an acoustic radiation pattern, which may improve sound focusing performance to a target position. The acoustic radiation pattern creating apparatus may process an input signal which may be output through a speaker array in a room such that at least one vertical-directional reflected wave component of the input signal may overlap a direct sound of the input signal at the target position. Then, the acoustic radiation pattern creating apparatus may replicate the processed input signal by the number of output channels of the speaker array, and may process the replicated input signals such that the replicated input signals may form a predetermined radiation pattern in a horizontal direction in the room when the replicated input signals are output through the speaker array.

Abstract: An apparatus for generating directional sound is provided. By using a time-variant beam pattern, the apparatus may generate constant direct waves in a listening area and may vary reflected waves followed by the direct waves according to time. The apparatus may convolute the time-variant beam pattern with a sound signal, may process an acoustic signal, which may be obtained through convolution, into a multi-channel signal, and may amplify and output the multi-channel signal.

Abstract: A method of controlling a power driver for LED illumination may include receiving, by a power correction unit, an AC voltage from the outside, rectifying the received AC voltage into a DC voltage, and correcting a power factor of the rectified DC voltage; and receiving, by a DC/DC converter unit, the DC voltage from the power factor correction unit and converting the received DC voltage into a DC voltage which has a magnitude different from the received DC voltage and is supplied to an LED module. A skip control unit, which is disposed in the DC/DC converter unit, may be fed back with a current flowing in the LED module driven by receiving the output from the DC/DC converter unit to detect a magnitude of the current and output a signal for a skip mode control depending on the detected magnitude of the current.

Abstract: A spatial sound energy (SSE) distribution control apparatus calculates filter coefficients for controlling distribution of the sound energy of an input signal, in consideration of a sound energy ratio between a reduction region for reducing transmission of a sound energy emitted through an array speaker and a concentration region for concentrating transmission of the sound energy and also in consideration of a sound energy efficiency of the concentration region. Also, the SSE distribution control apparatus determines an array size of a speaker in a case where the sound energy ratio is maximized, according to frequency variation of the input signal.

Abstract: A directional sound generating apparatus and a directional speaker array including the same are disclosed. The directional sound generating apparatus includes a sound transducer, a reflection plate which is located behind the sound transducer, and a blocking plate which is provided between a front portion and a back portion of the sound transducer.

Abstract: A sound focusing technique is provided to transfer sound to a particular direction. In a sound focusing apparatus, first and second speakers may be arranged to emit sound in opposite directions to form a sound zone. An amplitude and/or a phase of a received signal may be adjusted by a signal processing unit to assign the received signal and the adjusted signal to the first and second speakers, respectively.

Abstract: A sound enhancement apparatus and method which produce low IMD over a broadband frequency region and performs BSE to offer a sound which is natural to the human ears, are provided. The sound enhancement apparatus includes a preprocessor, a BSE signal generator, and a gain controller. The preprocessor divides a source signal into a high-frequency signal and a low-frequency signal and analyzes the low-frequency signal to obtain prediction information regarding a degree of distortion that will be generated by the low-frequency signal. The BSE signal generator generates a higher harmonic signal for the low-frequency signal as a BSE signal to be substituted for the low-frequency signal, wherein the order of the higher harmonic signal is adjusted based on the prediction information regarding the degree of distortion. The gain controller adjusts a synthesis ratio of the low-frequency signal and the BSE signal adaptively depending on the prediction information regarding the degree of distortion.

Abstract: There are provided a feedback control circuit and power supply apparatus using dimming adjustment and forward voltage control. The feedback control circuit includes: a voltage detection unit detecting an output voltage from a transformer and providing a detection voltage; a dimming unit generating a varied dimming signal; and a feedback circuit unit comparing the detection voltage with a reference voltage varied according to the dimming signal and providing a feedback voltage for controlling a power transmission ratio of the transformer.

Abstract: A method and an apparatus for editing a text in a mobile terminal are provided. The method includes a copying step of changing a color of at least one text selected by a copy icon if the copy step is selected while displaying texts on a display, and storing the at least one color-changed text, and a pasting step of pasting a text selected from a list including at least one text stored in the copying step to a specific location on the display if the paste step is selected.

Abstract: A spatial sound energy (SSE) distribution control apparatus calculates filter coefficients for controlling distribution of the sound energy of an input signal, in consideration of a sound energy ratio between a reduction region for reducing transmission of a sound energy emitted through an array speaker and a concentration region for concentrating transmission of the sound energy and also in consideration of a sound energy efficiency of the concentration region. Also, the SSE distribution control apparatus determines an array size of a speaker in a case where the sound energy ratio is maximized, according to frequency variation of the input signal.

Abstract: An apparatus and method for creating a personal sound zone are provided. The personal sound zone creating apparatus increases directivity in a horizontal direction by including a broadside array adapted to generate a sound beam perpendicularly to an arrangement of an array constituted by at least three transducers in a personal audio device. Also, the personal sound zone creating apparatus controls back radiation by including an end-fire array by arranging at least two arrays.

Abstract: A speaker system includes a body unit, a front panel slidably coupled to a front surface of the body unit, a first speaker unit that is provided on the front surface the body unit to output sound, and a second speaker unit that is provided on a rear surface of the front panel to output sound.

Abstract: Provided is a method of adjusting a distribution of spatial sound energy, including storing information associated with a sound transfer function from each of speakers of a speaker array to a position of at least one listener, and information associated with the sound transfer function from each of the speakers of the speaker array to a far-field position, and generating at least two sound beams maximizing a far-field sound pressure attenuation with respect to a source signal, based on information associated with the sound transfer function, in order to form a personal sound zone in the position of the at least one listener.

Abstract: A method and apparatus for reproducing a front surround sound, whereby a coefficient of at least one beamforming filter set is determined based on a sound pressure ratio of an emphasis area to a suppression area for each of the at least one channel signal included in a sound signal, where the emphasis area is an area into which the at least one channel signal is focused and the suppression area is an area within which the at least one channel signal is blocked, the at least one channel signal passes through a corresponding beamforming filter set, and the at least one filtered channel signal is output through an array speaker.

Abstract: Provided are an apparatus and method for controlling an acoustic radiation pattern output through an array of speakers. The apparatus stores a plurality of filter values for forming a plurality of corresponding control patterns set in advance from an input signal. The apparatus forms a compensation control pattern such that signals output through the array of speakers have an intended pattern in consideration of a filter value of a focusing filter. The apparatus selects at least one of the control patterns set in advance to form the compensation control pattern, and processes the input signal using a filter value corresponding to the selected control pattern.

Abstract: Disclosed are an apparatus and method for controlling output distortions of an amplifier. The apparatus for controlling output distortions of an amplifier, includes a compensation signal generator to predict a fluctuation of a supply voltage of a power supply using a prediction model which reflects fluctuations characteristics of the supply voltage, and to generate a compensation signal based on the prediction, and a compensator to transform an input signal using the compensating signal to control the output distortions.

Abstract: An apparatus and method for forming a Personal Sound Zone (PSZ) at a location of a listener are provided. An apparatus for simultaneously controlling a near sound field and a far sound field may classify the near sound field and the far sound field based on a distance between an array speaker and a listener, and may control the near sound field and the far sound field and thus, it is possible to perform focusing even when the listener is located in adjacent to the array speaker. Additionally, the apparatus may generate a directive sound source using the array speaker, and at the same time, may reduce a sound pressure in a far field, thereby reducing a sound source spreading to the far field while focusing is performed at the location of the listener.

Abstract: Provided are a method and apparatus for controlling a sound field through an array speaker. The method includes calculating a coefficient of a filter that controls sound pressure of an input signal, based on a sound pressure ratio of a suppression area that suppresses sound emitted from an array speaker and an emphasis area that emphasizes the sound, and sound pressure efficiency in the emphasis area, generating a plurality of output signals that focuses the sound to the emphasis area by filtering the input signal based on the calculated coefficient of the filter, and outputting a sound field controlled sound based on the generated plurality of output signals. Accordingly, a listener in a predetermined direction and distance from the array speaker can clearly hear sound, without wearing an earphone or a headset so as to focus the sound only to the listener.

Abstract: Described herein is an apparatus and method for estimating the amount of power that is to be consumed by an amplifier. An estimation section may be determined based on frame data of an input signal that is to be input to the amplifier. The estimation section may be stored to in a predetermined section, and the amount of power to be consumed by the amplifier may be estimated in advance based on the stored signal. The predetermined section may be determined in consideration of response a characteristic of a power supply of the amplifier. The amount of power may be calculated by assigning weight to the stored signal.

Abstract: A sound enhancement apparatus and method which produce low IMD over a broadband frequency region and performs BSE to offer a sound which is natural to the human ears, are provided. The sound enhancement apparatus includes a preprocessor, a BSE signal generator, and a gain controller. The preprocessor divides a source signal into a high-frequency signal and a low-frequency signal and analyzes the low-frequency signal to obtain prediction information regarding a degree of distortion that will be generated by the low-frequency signal. The BSE signal generator generates a higher harmonic signal for the low-frequency signal as a BSE signal to be substituted for the low-frequency signal, wherein the order of the higher harmonic signal is adjusted based on the prediction information regarding the degree of distortion. The gain controller adjusts a synthesis ratio of the low-frequency signal and the BSE signal adaptively depending on the prediction information regarding the degree of distortion.