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62results about How to "Improve sound performance" patented technology

Method for playing multi-channel stereo by matching multiple mobile phones

The invention provides a method for playing multi-channel stereo by matching multiple mobile phones, which comprises the following steps of: establishing Bluetooth connection of multiple mobile phones; setting division of multiple channels of the mobile phones, wherein each mobile phone is responsible for one channel; playing the multi-channel stereo by matching the multiple mobile phones; the steps for playing the multi-channel stereo by matching the multiple mobile phones comprise the specific steps of: analyzing audio frequency data of multiple channels in an audio frequency file from a first mobile phone; transmitting the audio frequency data in the multiple channels of the first mobile phone to other mobile phones through the Bluetooth connection; starting playing the audio frequency data of the first channel by the first mobile phone; meanwhile, transmitting a synchronous time stamp to other mobile phones through the Bluetooth connection by the first mobile phone; after the other mobile phones receive the synchronous time stamp of the first mobile phone, playing audio frequency data of other channels according to the time stamp by other mobile phones; and transmitting the synchronous time stamp and correspondingly-analyzed audio frequency data of other channels to the other mobile phones at fixed time by the first mobile phone until all audio frequency data are played completely.
Owner:SHANGHAI SIMCOM LTD

BPPA (Band-Pass Phase Adjustment) digital audio processor and sound box processor using same

The invention discloses a BPPA (Band-Pass Phase Adjustment) digital audio processor and a sound box processor using the same. The digital audio processor comprises n band-pass filters, n time delayers and an n*1 mixer. In the invention, input audio signals are separated into n paths of audio signals according to different frequency bands through the n band-pass filters; the n paths of audio signals are respectively input into the n paths of time delayers; and signals output by the n paths of time delayers are simultaneously input into the n*1 audio mixer to carry out mixing output. The digital audio processor is suitable for sound box processors with a single loudspeaker, two fractional frequencies, three fractional frequencies or multiple fractional frequencies. Based on the chip design of a DSP (Digital Signal Processor), the processors can be adjusted in a large range and large amplitude, have simple operation and obviously and greatly improve the tone quality performance. In addition, the invention can correct the phase deviation of the loudspeaker and improve the frequency response and the transient response of the loudspeaker, thereby reducing the distortion and greatly improving the tone quality performance of the loudspeaker.
Owner:GUANGZHOU LEAFUN CULTURE SCI & TECH

Electric power steering apparatus

[Problem] The present invention provides a motor control apparatus that is capable of making the whole system robust not only with respect to motor parameter variations such as the temperature variation and the manufacturing unevenness but also with respect to disturbances and an electric power steering apparatus mounting the motor control apparatus thereon.[Means for Solving the Problem] The motor control apparatus comprises a current detector for detecting a current of a motor and a controller for deciding a voltage command value based on at least a current command value, the controller comprises an adaptive identifying means for identifying parameter variations of an output model of the motor, a current estimating means for estimating a current of the motor, and a voltage command value deciding means for deciding the voltage command value, and the adaptive identifying means performs the identification based on at least a current detection value detected by the current detector and a current-estimate value calculated by the current estimating means, the current estimating means calculates the current-estimate value based on at least a result of the identification and the voltage command value, the voltage command value deciding means decides the voltage command value based on the current command value and the current-estimate value.
Owner:NSK LTD

Electric power steering apparatus

[Problem]The present invention provides a motor control apparatus that is capable of making the whole system robust not only with respect to motor parameter variations such as the temperature variation and the manufacturing unevenness but also with respect to disturbances and an electric power steering apparatus mounting the motor control apparatus thereon.[Means for solving the problem]The motor control apparatus comprises a current detector for detecting a current of a motor and a controller for deciding a voltage command value based on at least a current command value, the controller comprises an adaptive identifying means for identifying parameter variations of an output model of the motor, a current estimating means for estimating a current of the motor, and a voltage command value deciding means for deciding the voltage command value, and the adaptive identifying means performs the identification based on at least a current detection value detected by the current detector and a current-estimate value calculated by the current estimating means, the current estimating means calculates the current-estimate value based on at least a result of the identification and the voltage command value, the voltage command value deciding means decides the voltage command value based on the current command value and the current-estimate value.
Owner:NSK LTD

Method of adjusting an acoustic output from a display device

A display device arranged generates a visual and an acoustic output according to an input signal (AVS) with audio (AS) and video (VS) content. The display device includes a cabinet (C) with different mounting fittings (MS, MW) arranged for different types of mounting of the display device. A display (FPD), an acoustic system including one or more loudspeakers (L), a mounting detector (SW), e.g. a microswitch, arranged to detect a type of mounting of the display device, and compensation means (AF) arranged to modify the acoustic output from the display device according to the detected type of mounting of the display device. Hereby, it is possible to adjust the frequency content of the acoustic output from the acoustic system, e.g. electronically, to correspond to the acoustic environment determined by means of sensing the type of mounting of the display device. E.g. one microswitch can be used to discriminate between wall or stand mounting, and digital coefficients for an IIR or an FIR filter can be selected accordingly to compensate the acoustic output from the display device to a desired response. Hereby sound performance of especially flat panel display devices can be improved, since such devices typically exhibit an audio performance which is highly depending on the type of mounting due.
Owner:TP VISION HLDG B V HOLDCO
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