Abstract: Present embodiments provide methods and systems for identifying quiet and/or under utilized segments of the radio spectrum and assigning the identified spectrum to non-primary license holders. The methods and systems may include spectrum management nodes for monitoring frequency bands of the radio spectrum for transmission by a primary user. When a primary user is not transmitting, segments of the quiet spectrum may be assigned to a non-primary user.

Abstract: A method for detecting and modifying breath pauses in a speech input signal includes detecting breath pauses in a speech input signal; modifying the breath pauses by replacing the breath pauses with a predetermined input and/or attenuating the breath pauses; and outputting an output speech signal. A computer program for carrying out the method is also presented.

Abstract: A method operates a limited-bandwidth network in a differential service (DiffServ) mode with DCCP congestion control to provide high throughput with good QoS.

Abstract: A system for generating closed captions from an audio signal includes an audio pre-processor configured to correct one or more predetermined undesirable attributes from an audio signal and to output one or more speech segments. The system also includes a speech recognition module configured to generate from the one or more speech segments one or more text transcripts and a post processor configured to provide at least one pre-selected modification to the text transcripts. Further included is an encoder configured to broadcast modified text transcripts corresponding to the speech segments as closed captions.

Abstract: A system for detecting and modifying breath pauses in a speech input signal includes a breath detection unit connected to receive the speech input signal and to detect breath pauses. The system also includes a modification unit connected to receive input from the breath detection unit and to replace the breath pauses with a predetermined input and/or to attenuate the breath pauses. The breath detection unit is further configured to output an output speech signal.

Abstract: A method for enhancing speech prediction coefficient signals, including: a) receiving a set of prediction coefficient signals; b) calculating a set of amplitude spectrum coefficient signals based on the prediction coefficient signals; c) calculating a set of enhancement coefficient signals based on the amplitude spectrum coefficient signals; d) calculating a set of enhanced autocorrelation coefficient signals based on the enhancement coefficient signals; e) converting at least some of the enhanced autocorrelation coefficient signals into reflection coefficient signals; f) testing the range of values of the reflection coefficient signals; and g) converting at least some of the tested reflection coefficient signals into prediction coefficient signals.

Abstract: A method for transcoding a bit stream encoded according to a mixed-excitation linear prediction (MELP) standard to a bit stream encoded according to a linear predictive coding (LPC) standard, including: decoding a bit stream into a first set of vocoder parameters compatible with the MELP standard; transforming the first set of vocoder parameters into a second set of vocoder parameters compatible with the LPC standard without converting the first set of vocoder parameters to an analog or digital waveform representation; and encoding the second set of vocoder parameters into a bit stream compatible with the LPC vocoder standard.

Abstract: A method for transcoding a bit stream encoded according to a linear predictive coding (LPC) standard to a bit stream encoded according to a mixed-excitation linear prediction (MELP) standard, including: decoding a bit stream into a first set of vocoder parameters compatible with the LPC standard; transforming the first set of vocoder parameters into a second set of vocoder parameters compatible with the MELP standard without converting the first set of vocoder parameters to an analog or digital waveform representation; and encoding the second set of vocoder parameters into a bit stream compatible with the MELP vocoder standard.

Abstract: A method for enhancing prediction coefficient signals, including: a) receiving a set of prediction coefficient signals; b) generating a set of bandwidth expanded coefficient signals based on like prediction coefficient signals; c) converting at least some of like prediction coefficient signals and like bandwidth expanded coefficient signals into corresponding autocorrelation domain coefficient signals; d) convolving like autocorrelation domain coefficient signals; e) converting like convolved autocorrelation domain coefficient signals into reflection coefficient signals; f) determining the stability of like reflection coefficient signals; and g) converting like reflection coefficient signals into enhanced prediction coefficient signals.

Abstract: The system and method of the present invention comprises a compressed domain voice activity detector that detects the presence or absence of voice activity in a digital input signal. The method includes converting a digital input signal into parametric data. The parametric data is subsequently analyzed, and then compared against a background noise threshold to determine if voice activity is present.

Abstract: A communication system is presented. The system includes one or more transmitters configured to transmit a signal, where each of the signals generated by the one or more transmitters corresponds to a respective frequency. Further, the system includes a plurality of receiver front-ends configured to receive the signal transmitted by each of the one or more transmitters. The system also includes a plurality of remodulator modules configured to translate each of the received signals to a signal having a respective intermediate frequency. In addition, the system includes a combining module configured to combine each of the signals having respective intermediate frequencies to generate a single composite signal. Also, the system includes a single analog-to-digital converter configured to process the composite signal and generate a digital output. Additionally, the system includes a digital signal processor module configured to extract the signal transmitted by each of the one or more transmitters.

Abstract: An analog-to-digital converter compensation method includes providing at least one analog tone, converting the analog tone into digital signals, and using the digital signals to generate an error compensation model comprising a plurality of compensation values corresponding to respective digital signals. The compensation values are obtained by applying a time domain window, performing a discrete Fourier transform on digital signals within the time domain window, zeroing out transform bins except for bins within lobes on selected spurious frequencies, performing an inverse Fourier transform, and obtaining resulting signals from applying an inverse of the time domain window.

Abstract: A system for training a linearization compensation model includes a tone generator for providing at least two different RF tones, receiver path components for processing the RF tones, an analog-to-digital converter for converting the processed RF tones into digital signals, and a processor for using the digital signals to generate the linearization error compensation model. The resulting compensation model is particularly useful in a linearization system which includes a receiver for measuring a signal, an electro-optical modulator configured for converting the measured signal to an optical signal, an optical-electrical detector configured for converting the optical signal to an analog electrical signal, an analog-to-digital converter for converting the analog electrical signal into a digital signal with the processor being used for removing linearization errors from the digital signal.

Abstract: A software defined radio detects an amplitude modulated (AM) signal contained within a received signal. This detection involves first receiving a radio frequency (RF) signal that contains the AM signal modulated about a carrier frequency (fc). The RF signal is downconverted using a first local oscillator having a frequency flo. An in-phase (I) channel signal and a quadrature (Q) channel signal are produced. From the I-channel signal, a relationship between the carrier frequency and the frequency of the local oscillator is determined with a frequency detector. The downconverted carrier signal of the I-channel signal is used to create a second set of signals with proper phases and frequencies that can be used to rotate the I-channel and Q-channel signals to account for differences between the downconverted fc and DC.

Abstract: A physiological parameter monitoring system and method is described. The system includes a plurality of sensors configured to obtain from a subject at least one observable voltage containing two or more signals. The system also includes a data manager and a data auxiliary device. The data manager is in communication with the plurality of sensors and is configured to assemble and format data obtained by the plurality of sensors. The data manager is configured to isolate one of the two or more signals. The method includes placing a plurality of sensors in communication with a subject, transmitting data from the plurality of sensors to a data manager, and isolating a desired voltage signal from the plurality of voltage signals.

Abstract: A method for enhancing pace pulses is presented. The method includes providing a set of digital electrocardiogram data comprising a plurality of pulses, wherein each pulse is of a generally constant width. Furthermore, the method includes differentiating the plurality of pulses to generate a plurality of pairs of differentiated pulses, wherein each pair of differentiated pulses is separated by the generally constant width of the corresponding pulse. In addition, the method includes enhancing the plurality of pairs of differentiated pulses. Systems and computer-readable medium that afford functionality of the type defined by this method are also provided by the present technique.

Abstract: The present technique provides for the detection of pace pulses in electrocardiogram data. The technique provides for processing one or more sets of electrocardiogram data via a non-linear algorithm. Furthermore, the technique provides for detecting one or more pace pulses in the one or more sets of electrocardiogram data via a non-linear detection algorithm. Systems and computer programs that afford functionality of the type defined by this method are also provided by the present technique.

Abstract: The system and method of the present invention comprises a compressed domain universal transcoder that transcodes a bit stream representing frames of data encoded according to a first compression standard to a bit stream representing frames of data according to a second compression standard. The method includes decoding a bit stream into a first set of parameters compatible with a first compression standard. Next, the first set of parameters are transformed into a second set of parameters compatible with a second compression standard without converting the first set of parameters to an analog or digital waveform representation. Lastly, the second set of parameters are encoded into a bit stream compatible with the second compression standard.

Abstract: The system and method of the present invention comprises a compressed domain conference bridge. The method includes maintaining full intelligibility for all users even when there are multiple simultaneous talkers. The bridge also allows a user to hear a plurality of talkers over a single channel.