Abstract: In many audio playback systems, frequencies below a given cut off frequency are suppressed either due to speaker constraints or safety constraints. For example, some speakers are only capable of generating signals above a certain frequency. Prolonged low frequency sound can cause damage to speakers or other components. An audio driver can be equipped with a phantom bass module which by doubling, tripling and/or quadrupling frequencies below a cutoff frequency can simulate the bass experience. The doubling, tripling and quadrupling methods disclosed provide a low complexity formulation of a frequency doubling, tripling and quadrupling. In addition, the frequency doubling, tripling and quadrupling formulations are easily adapted to multi-rate processing, where computational savings can be very high.

Abstract: Traditionally, echo cancellation has employed linear adaptive filters to cancel echoes in a two way communication system. The rate of adaptation is often dynamic and varies over time. Disclosed are novel rates of adaptation that perform well in the presence of background noise, during double talk and with echo path changes. Additionally, the echo or residual echo can further be suppressed with non-linear processing performed using joint frequency-time domain processing.

Abstract: A database system comprising a plurality of access keys stored in a first data memory device sector, each access key associated with a node value stored in a second data memory device sector. An access key processor configured to receive an input value and return the associated node value for the input value if the input value matches an access key stored in the first data memory device sector. The access key processor is configured to generate a revised input value if the input value does not match an access key stored in the first data memory device; a default node value stored in the second data memory device sector and associated with a portion of the input value, wherein the access key processor is configured to return the default node value as part of the revised input value.

Abstract: A system for booting a processor from NAND flash, comprising a NAND agnostic boot controller and a NAND flash device, wherein the NAND flash device further comprises a boot wrapper storing boot code in a predetermined format.

Abstract: Biphase mark codes (BMC) are used in digital communications. Most BMC formats use preambles for rate determination and synchronization. A decoder compares the intervals of continuous high or continuous low voltages in a BMC stream to predetermined minimum and maximum values of half cell, full cell and one-and-a-half cell intervals for all supported sampling rates. If a pattern matching a preamble is found, the sampling rate is locked in and the decoder is synchronized to the BMC stream. Once locked, the decoder uses the predetermined minimum and maximum values at the locked rate to generate half cell, full cell and one-and-a-half cell indicators for a decoding state machine which decodes data in the BMC stream or decodes expected preambles.

Abstract: Systems and methods for broadcast and multicast retransmissions within a protected wireless communications system are described. Retransmitted broadcast or multicast frames are designated by modification of fields or subfields in the MAC header of the frame which are constituent parts of the additional authentication data used to generate encryption keys. Such modifications cause legacy receivers to disregard the retransmitted frames or render legacy receivers to be unable to decrypt the retransmitted frame, avoiding the generation of duplicate frames. Non-legacy receivers recognizing the modification conventions can restore the MAC header to the original state and can reconstruct the original encryption keys and decrypt the retransmitted frames. A non-legacy transmitter can retransmit a frame without the need to re-encrypt the frame.

Abstract: High linearity is essential in audio circuitry. As sampling rates for audio applications are needed, high speed and high linearity are needed in analog and mixed signal portions of audio circuitry such as in current mirrors. A current mirror employs two current paths in an output. The first current path is driven by a fast acting transistor through a resistor. The second current path is driven by a differential amplifier coupled to another transistor through another resistor. The second current path is used to maintain linearity by causing the voltage across both transistors to be the same.

Abstract: A circuit comprising a first input transistor having a drain, a source and a gate. A first diode connected transistor having a drain, a source and a gate, wherein the gate of the first diode connected transistor is coupled to the drain of the first diode connected transistor, and the drain of the first input transistor is coupled to the drain of the first diode connected transistor. A first load transistor having a drain, a source and a gate, wherein the drain of the first load transistor is coupled to the drain of the first diode connected transistor and the source of the first load transistor is coupled to the source of the first diode connected transistor.

Abstract: A reconfigurable amplifier comprising a first operational amplifier having two inputs and an output. A second operational amplifier having two inputs and an output. A plurality of switches coupled to the two inputs and the output of the first operational amplifier and the two inputs and the output of the second operational amplifier, wherein a first configuration of the plurality of switches causes the first operational amplifier and the second operational amplifier to operate as an inverting differential input amplifier, and wherein a second configuration of the plurality of switches causes the first operational amplifier and the second operational amplifier to operate as a non-inverting differential input instrumentation amplifier.

Abstract: A dual-voltage receiver, comprising a voltage detector. A high voltage Schmitt trigger coupled to the voltage detector. A low voltage Schmitt trigger coupled to the voltage detector. A combined level shifter coupled to the high voltage Schmitt trigger and the low voltage Schmitt trigger, wherein the high voltage Schmitt trigger is on and the low voltage Schmitt trigger is off when the voltage detector outputs a high voltage detect signal.

Abstract: Modern electronic devices are getting more portable and smaller leading to smaller distances between speakers. In particular, computers are now so compact that the notebook computer is one of the most popular computer types. However, with the proliferation of media available in digital form, both music recordings and video features, the demand for high quality reproductions on computers has increased. Systems and methods for producing wider speaker effects and immersion effects disclosed can enhance a listener's experience even in a notebook computer.

Abstract: A system for application management. A plurality of applications, each having an associated precedence, an include data string and an exclude data string. A plurality of daemons, each for monitoring a data port and extracting a data stream received at the data port. A system manager for receiving the precedence, the include data string and the exclude data string for each application and an extracted data stream from one of the daemons and selecting one of the plurality of applications as a function of the precedence, the include data string and the exclude data string for each application.

Abstract: Provided is a fully differential adaptive bandwidth phase locked loop with differential supply regulation. One fully differential phase locked loop includes a differential active loop filter and regulator coupled to an output of a differential charge pump, a differential voltage-controlled oscillator coupled to differential control voltages developed by the differential active loop filter and regulator, and a bias circuit coupled to the differential control voltages and providing a bias current to the differential charge pump.

Abstract: A method for signal processing, receiving a time domain signal having a sample-rate Fs and generating N time domain signal bands, each having a bandwidth equal to Fs/N. Receiving the N signal bands and transforming a first time domain signal band to a frequency domain at a first resolution and a second time domain signal band to the frequency domain at a second resolution, where the first resolution may be different from the second resolution. Determining one or more first filter coefficients using the frequency domain components from the first signal band and one or more second filter coefficients using the frequency domain components from the second signal band. Transforming the first and second filter coefficients from the frequency domain to a time domain. Applying the first and second time domain filter coefficients to the first and second time domain signals, respectively.

Abstract: Wafer level packaging (WLP) packages semiconductor dies onto a wafer structure. After the wafer level package is complete, individual packages are obtained by singulating the wafer level package. The resulting package has a small form factor suitable for miniaturization. Unfortunately conventional WLP have poor heat dissipation. An interposer with a thermal pad can be attached to the semiconductor die to facilitate improved heat dissipation. In one embodiment, the interposer can also provide a wafer substrate for the wafer level package. Furthermore, the interposer can be constructed using well established and inexpensive processes. The thermal pad attached to the interposer can be coupled to the ground plane of a system where heat drawn from the semiconductor die can be dissipated.

Abstract: A satellite signal demodulator is configured to use frequency-based channel scanning to sense the presence of a channel and to obtain the frequency profile of the channel. Once the channel is identified and the profile is obtained, channel extraction is used to identify the frequency parameters for a given channel. A coarse parameter estimation is performed to obtain a coarse estimate of the symbol rate (SR) and the center frequency (fc) of the channel. The coarse estimation can then be followed by a fine estimation of the symbol rate and center frequency (fc), using a bit tracking loop (BTL) lock indicator.

Abstract: Presented is a method for fabricating a semiconductor package, and the associated semiconductor package. The method includes providing a compliant coverlay having a resin film disposed thereon. A plurality of metallic spheres may be placed at predetermined positions in the resin film. A top surface and a bottom surface of the metallic spheres may be flattened. Tamp blocks on opposing sides of the metallic spheres may be used. The resin film may then be cured to permanently set the metallic spheres in the resin film, and the compliant overlay may then be removed. A semiconductor die may then be placed on the plurality of metallic spheres. An encapsulating layer may then be deposited over the semiconductor die, the plurality of metallic spheres, and the resin film. The semiconductor package may then be diced. The method does not include fabricating a metal leadframe for the semiconductor die.

Abstract: A modem for use with a computer having a demodulator and a decoder, the modem comprises a hardware interface; a demodulator front-end having a first input and a first output, the first output of the demodulator front-end being configured to interface with the demodulator of the computer and to provide a demodulated front-end signal to the demodulator over the hardware interface; and a forward error correction (FEC) unit having a second input and a second output, the second input of the FEC unit being configured to interface with the demodulator of the computer and to receive a demodulated signal from the demodulator over the hardware interface, the demodulated signal being a demodulation of the demodulated front-end signal, and the second output of the FEC unit being configured to interface with the decoder of the computer and to provide an FEC signal to the decoder over the hardware interface.

Abstract: There is provided a system and method for a shielded connector module with a molded hood and an LED light pipe. There is provided a shielded connector module comprising a system-in-package (SiP) device having a surface mounted light emitting diode (LED), a metallic shield surrounding the SiP device, a molded hood surrounding the metallic shield, and an LED light pipe in a proximity with the surface mounted LED, the LED light pipe being directed through the metallic shield and the molded hood. By designing the LED light pipe with a concave surface for surrounding the surface mounted LED and by using various techniques to reduce a gap between the LED and the light pipe, light capture and transmission may be optimized for easily viewable high intensity light. A fresnel lens may be optionally attached to the light pipe for wider viewing angles.

Abstract: A system for isolating individual channels in a broadcast signal is provided. The system includes a plurality of multipliers, each having an input and an output. A summer coupled to the outputs of each of the plurality of multipliers is provided to generate an output. A multiplication factor system provides a multiplication factor to each of the multipliers to select a predetermined frequency channel of the input signal.