Abstract: A system for producing parameters for a bass-enhanced loudspeaker enclosure; meanwhile, a low-frequency extended frequency, a quality and quantity ratio and radius of a port need to be defined for the system. Also, the resonance frequency of a mechanical system and the quality and quantity of a mechanical system are fixed to obtain the parameters for the frequency ratio, the length of the duct and the cavity volume inside the device, etc. and to manufacture the bass-enhanced loudspeaker enclosure.

Abstract: A chrome-free corrosion inhibitor composition includes: titanium chloride; a stabilizer including a mixture of hydrogen peroxide and at least a compound selected from nitric acid, persulfate, nitrate, and chlorate; and a film-forming enhancer selected from monosaccharide, oligosaccharide, polysaccharide, derivatives of saccharide, and combinations thereof.

Abstract: A digital communication device is provided for decoding a data stream to generate a receiver output. In the digital communication device, a burst error detector determines burst noise locations corresponding to the data stream according to an error-check equation and accordingly generates a burst error indicator. Thereafter, an inner decoder decodes the data stream to generate an inner decoded stream, comprising an erasure marker for performing an erasure marking process on the inner decoded stream based on the burst error indicator to generate an erasure indicator corresponding to the inner decoded stream. An outer decoder then decodes the inner decoded stream with reference to the erasure indicator to generate the receiver output.

Abstract: A paper rack with functions of accessing and playing multimedia files is provided, wherein a circuit board has transmission junctions, sockets, and a wireless receiver and emitter for connecting with a digital information equipment, a memory card, a wireless network, and a wireless receiving and emitting device, and transmitting a digital file and a multimedia file. A hard disk for storing a digital file and a multimedia file is also included in the paper rack. Moreover, a control and data processing for the aforementioned components connected can be performed through a touch screen and a control button, and the corresponding digital files and multimedia files can be further played with the touch screen, a liquid crystal display unit, and a speaker.

Abstract: A method and an apparatus for calculating an error metric in a digital communication receiver. In the receiver, an input data stream is used to generate at least one input bit stream. The combinational logic unit performs an error-check operation on delayed and current bits of the input bit stream using a polynomial error-check equation previously determined. Finally, an accumulator is used to accumulate a number of trials with respect to the error check operation and generates a nominal error-check number based on the number of the correct trials.

Abstract: An apparatus for generating a detected punctured position in punctured convolutional codes. A delay line circuit has a plurality of delay elements connected in series, storing a finite sequence of an input bit stream. A logic gate circuit, coupled to outputs of a part of the delay elements of the delay line circuit in accordance with a parity check polynomial, performs a logic operation to output a number stream. The number stream is accumulated for possible punctured positions and the one of the possible punctured positions with a minimal accumulated number is selected and determined as the detected punctured position.

Abstract: A sound broadcasting mechanism and an electronic device using the same are provided. The sound broadcasting mechanism includes a sound box, a sound broadcasting element and a sound enhancing element. The sound broadcasting element is disposed at the surface of the sound box to generate a sound signal. The sound enhancing element is disposed at the surface of the sound box. The sound enhancing element includes a resonating film and a weight increasing element. The resonating film can resonate with the sound signal in a resonating frequency range to enhance the sound intensity of the sound signal in the resonating frequency range. The weight increasing element is attached to the surface of the resonating film. The weight of the weight increasing element is related to the resonating frequency range.

Abstract: The present invention provides a multifunctional remote control device. It characterizes that after a memory card is inserted in a memory card slot, a memory card control circuit instantly reads the audio/visual data in the memory card. Meanwhile a control button on a panel keyboard directs the commands to a control circuit through a panel circuit. The control circuit drives the memory card control circuit to send audio/visual data to a coding circuit which translates the data to wireless signals. The wireless signals are then sent by a transmitter and picked up by the receiving device of the receiver. A power source joint disposed at the rear side of the receiver is for the power supply. The panel keyboard sends audio/visual viewing commands such as forwarding, rewarding and volume through the control circuit.

Abstract: A system for detecting a regularly appearing pattern in a stream of symbols. The system comprises a detector, a first and second memory, a first and second pointer, and a processor. The detector compares detecting bits with a predetermined value, and generates a detection signal when the received symbol is equal to the predetermined value. The first memory array has K cells, and the second memory array has W cells. The first pointer circularly points to each cell of the first memory array in order. The second pointer does the same. The count value of the cell pointed to by the first or second pointer is incremented by one when the detection signal is received. The processor determines whether the regularly appearing pattern is detected or not according to the count values of the first and the second memory array.

Abstract: An apparatus and method for determining a puncture position for a de-puncturing process. A stream of received symbols that corresponds to a code is received. A slicing unit slices the stream of received symbols to determine representative bits of the code to form a first bit stream. A delay line delays the first bit stream to generate a second bit stream. A convolutional decoder de-punctures and decodes the received symbol to generate a third bit stream.

Abstract: A method for estimating channels of an OFDM signal. The method comprises the steps of deriving responses of pilot channels, deriving responses of first data channels by time and frequency domain combined linear interpolation among the responses of the pilot channels, deriving each response of boundary channels by frequency domain linear interpolation between the responses of the nearest pilot and first data channels, and deriving responses of second data channels by frequency domain extrapolation using the responses of the pilot and first data channels.

Abstract: The present invention discloses a method for parameter identification and parameter optimization of microspeakers. Measurement procedures for identifying electromechanical constants of microspeaker and a GUI are developed to facilitate estimation of electroacoustic parameters of the microspeaker under test. In light of the thus identified microspeaker parameters, a parameter optimization procedure is carried out to obtain the design that attains the best acoustic performance with minimum harmonic distortion.

Abstract: A metric generation scheme for use in OFDM receivers. In a preferred embodiment, an OFDM receiver of the invention includes a dynamic quantizer to compress a series of channel-state information values. Also, a bit de-interleaver is provided to de-interleave a series of symbol-based data inverse to interleaving operations at a transmitter end. The de-interleaved symbol-based data is further compressed by another dynamic quantizer to yield a complex signal according to a constellation scheme. Then a metric generator calculates a bit metric of a zero group and a bit metric of a one group for each received bit in which the constellation is divided into the one group and the zero group for each bit location.

Abstract: A method and system for locating packet boundaries in a bit stream. The method comprises generating a checksum from a first bit stream, and recovering the first bit stream according an intermediate result which is generated during the checksum processing. The step of generating the checksum comprises dividing the first bit stream by a first polynomial to obtain a second bit stream, delaying the second bit stream by a first delay amount to form a third bit stream, multiplying the third bit stream by a second polynomial to obtain a fourth bit stream, adding the second and fourth bit streams to form a fifth bit stream, and correlating the fifth bit stream with a preset pattern to output a sync signal. The input bit stream can be recovered according to the third bit stream. The sync signal indicates the location of the packet boundary in the delayed first bit stream.

Abstract: A motor controller includes a power source unit providing a direct current output, a drive unit including a drive coil, first and second transistor units, a voltage drop component, and a processor. The transistor units are coupled to the power source unit and the drive unit, and enable electricity to flow through the drive coil in a first direction when the first and the second transistor units are in conducting and non-conducting states respectively, and in an opposite second direction when the first and the second transistor units are in non-conducting and conducting states respectively. The voltage drop component has a first end coupled to the drive unit and a grounded second end. The processor is coupled to a junction of the drive unit and the voltage drop component, and provides first and second pulse-width-modulated signals to the first and second transistor units, respectively.

Abstract: A method for adaptively tuning an equalizer is disclosed. The method includes utilizing the equalizer to process an input signal and accordingly generate an output signal, determining whether the equalizer has converged, and adjusting an equalizer step size of the equalizer according to a result of the step of determining whether the equalizer has converged.

Abstract: A method and a related apparatus that decode an input signal to generate an output signal. The method includes determining burst noise locations corresponding to the input signal and generating a first indication signal accordingly, decoding the input signal to generate an inner-code decoded signal, selectively adopting one of a plurality of determining criteria according to the first indication signal to determine reliability information corresponding to the inner-code decoded signal and to generate a second indication signal accordingly, and decoding the inner-code decoded signal with reference to the second indication signal to generate the output signal.

Abstract: An apparatus for error-correcting an input signal to generate an output signal. The apparatus includes an unreliable-location determining module for determining unreliable-locations of the input signal and generating an indication signal accordingly, a first error-correcting module for error-correcting the input signal to generate a first candidate signal, a second error-correcting module coupled to the unreliable-location determining module for error-correcting the input signal with reference to the indication signal to generate a second candidate signal, and a selecting module coupled to the first and second error-correcting modules for selecting one of the first and second candidate signals to be the output signal.

Abstract: A briefcase with functions of accessing and playing multimedia files is provided, wherein a circuit board is provided with transmission connectors and slots for connecting with digital information equipment and a memory card, as well as mutually transmitting digital files and multimedia files. A hard disk for storing digital files and multimedia files is also included in the briefcase. Moreover, a control and data processing for the aforementioned elements connected can be performed through control buttons, and the digital files and multimedia files inside the aforementioned memory card, digital information equipment, and hard disk can be played with speakers.