Abstract: A publish-subscribe system publishes events associated with one or more objects represented by files within a file system. The files may be accessed using a file system application programming interface by both publishers and subscribers. Each file may contain an identifier and a plurality of attributes and each attribute may have a name and a value. The files and the associated objects may be persisted to compensate for restarts and failures of a computing platform hosting the system for publish-subscribe.

Abstract: A computer system having a transaction based file system is disclosed. The computer system includes file system software that manages the file data and the file system structure of files stored on a persistent data storage device and maintains a transaction file that includes a plurality of transaction records. Each of the transaction records has a header section and a data section. The header section of each transaction record includes one or more fields that are designated to store information corresponding to a file transaction that is represented by the transaction record. The file system software executes a startup process in which a reconstructed file system is generated in random access memory. The startup process skips verification of the data section of a transaction record when the transaction record meets one or more predetermined criterion.

Abstract: A speech enhancement system improves the perceptual quality of an aural signal. A receiver detects and receives an unvoiced signal, a fully voiced signal, or a mixed voice remote signal. A coherence processor identifies the similarities or differences between a local signal and the remote signal. A cancellation processor or controller dampens reflected signals that may be part of the local signal.

Abstract: A voice enhancement logic improves the perceptual quality of a processed voice. The voice enhancement system includes a passing tire hiss noise detector and a passing tire hiss noise attenuator. The passing tire hiss noise detector detects a passing tire hiss noise by modeling the passing tire hiss. The passing tire hiss noise attenuator dampens the passing tire hiss noise to improve the intelligibility of a speech signal.

Abstract: A speech enhancement system improves the speech quality and intelligibility of a speech signal. The system includes a time-to-frequency converter that converts segments of a speech signal into frequency bands. A signal detector measures the signal power of the frequency bands of each speech segment. A background noise estimator measures a background noise detected in the speech signal. A dynamic noise reduction controller dynamically models the background noise in the speech signal. The speech enhancement renders a speech signal perceptually pleasing to a listener by dynamically attenuating a portion of the noise that occurs in a portion of the spectrum of the speech signal.

Abstract: The present invention relates generally to computer operating systems, and more specifically, to operating system calls in a symmetric multiprocessing (SMP) environment. Existing SMP strategies either use a single lock or multiple locks to limit access to critical areas of the operating system to one thread at a time. These strategies suffer from a number of performance problems including slow execution, large software and execution overheads and deadlocking problems. The invention applies a single lock strategy to a micro kernel operating system design which delegates functionality to external processes. The micro kernel has a single critical area, the micro kernel itself, which executes very quickly, while the external processes are protected by proper thread management. As a result, a single lock may be used, overcoming the performance problems of the existing strategies.

Abstract: A system comprising a processor, a data storage device that is accessible by the processor, and filesystem software that is executable by the processor to organize files on the data storage device are provided. The filesystem software is executable to maintain a filename cache having variable size filename entries. The filename entries may include a filename header section and a name section storing an entire filename of a corresponding file.

Abstract: A computer system having a transaction based file system is disclosed. The computer system includes file system software that manages the file data and the file system structure of files stored on a persistent data storage device and maintains a transaction file that includes a plurality of transaction records. Each of the transaction records has a header section and a data section. The header section of each transaction record includes one or more fields that are designated to store information corresponding to a file transaction that is represented by the transaction record. The file system software executes a startup process in which a reconstructed file system is generated in random access memory. The startup process skips verification of the data section of a transaction record when the transaction record meets one or more predetermined criterion.

Abstract: A system classifies the source of an input signal. The system determines whether a sound source belongs to classes that may include human speech, musical instruments, machine noise, or other classes of sound sources. The system is robust, performing classification despite variation in sound level and noise masking. Additionally, the system consumes relatively few computational resources and adapts over time to provide consistently accurate classification.

Abstract: A voice enhancement logic improves the perceptual quality of a processed signal. The voice enhancement system includes a noise detector and a noise attenuator. The noise detector detects and models the noise associated with rain. The noise attenuator dampens or reduces the rain noise from a signal to improve the intelligibility of an unvoiced, a fully voiced, or a mixed voice segment.

Abstract: A microphone shield system captures sound in adverse conditions. The system includes a microphone positioned within a membrane. The membrane is inflated around the microphone to form an enclosure. The inflated membrane passes signals within a selected frequency range. The membrane may block or attenuate signals above and/or below the frequency range to pass a desired sound with little surrounding interference.

Abstract: A system is set forth that includes a processor, one or more memory storage units, and software code stored in the one or more memory storage units. The software code is executable by the processor to generate a plurality of adaptive partitions that are each associated with one or more process threads. Each of the plurality, of adaptive partitions has one or more corresponding scheduling attributes that are assigned to it. The software code further includes a scheduling system that is executable by the processor for selectively allocating the processor to run the process threads based on a comparison between ordering function values for each adaptive partition. The ordering function value for each adaptive partition is calculated using one or more of the scheduling attributes of the corresponding adaptive partition.

Abstract: The system describes a karaoke system that enhances the experience of singing along with music, but without the need to display the lyrics. The system includes a combination of a vocal track reducer and an echo canceller, decision logic for determining when a person is talking or singing (double-talk detector) and a method for “ducking” (i.e., attenuating) the vocal track when the singing is detected. No special CD or DVD with lyric tracks is required, making the system capable of working with CD, mp3, AM, FM, HD radio, satellite radio signals, or any other suitable content source. The result is that any content source may potentially be used as a karaoke soundtrack without any pre-modification.

Abstract: A processing system includes memory management software responsive to changes in a page table to consolidate a run of contiguous page table entries into a page table entry having a larger memory page size. The memory management software determines whether the run of contiguous page table entries may be cached using the larger memory page size in an entry of a translation lookaside buffer. The translation lookaside buffer may be a MIPS-like TLB in which multiple page table entries are cached in each TLB entry.

Abstract: A system extends the high-frequency spectrum of a narrow band audio signal in the time domain. The system extends the harmonics of vowels by introducing a non linearity in a narrow band signal. Extended consonants are generated by a random-noise generator. The system differentiates the vowels from the consonants by exploiting predetermined features of a speech signal.

Abstract: A system comprising a processor, a data storage device that is accessible by the processor, and filesystem software that is executable by the processor to organize files on the data storage device are provided. The filesystem software is executable to maintain a filename cache having variable size filename entries. The filename entries may include a filename header section and a name section storing an entire filename of a corresponding file.

Abstract: The present invention relates generally to computer graphics, and more specifically to methods of, and systems for, configuring, controlling and accessing multiple hardware graphics layers that are used to compose a single video display.

Abstract: A voice enhancement logic improves the perceptual quality of a processed voice. The voice enhancement system includes a noise detector and a noise attenuator. The noise detector detects a wind buffet and a continuous noise by modeling the wind buffet. The noise attenuator dampens the wind buffet to improve the intelligibility of an unvoiced, a fully voiced, or a mixed voice segment.

Abstract: The invention includes a method, apparatus, and computer program to selectively suppress wind noise while preserving narrow-band signals in acoustic data. Sound from one or several microphones is digitized into binary data. A time-frequency transform is applied to the data to produce a series of spectra. The spectra are analyzed to detect the presence of wind noise and narrow band signals. Wind noise is selectively suppressed while preserving the narrow band signals. The narrow band signal is interpolated through the times and frequencies when it is masked by the wind noise. A time series is then synthesized from the signal spectral estimate that can be listened to. This invention overcomes prior art limitations that require more than one microphone and an independent measurement of wind speed. Its application results in good-quality speech from data severely degraded by wind noise.

Abstract: An electronic data system comprises memory storage having stored data, file system software, and a transaction file. The transaction file is maintained by the file system software, and includes a plurality of transaction records corresponding to transactions that have been or are to be executed on one or more files and/or the or more directories of the file system. The file system software operates to organize and maintain the stored data in the files and directories and also to coalesce multiple transaction records meeting one or more criteria into fewer coalesced transaction records. The physical memory space required by the transaction file is reduced by the transaction record coalescing. The coalesced transaction records may be constructed so that they represent a logical result of applying each transaction record of a transaction record set in chronological order.