Abstract: An apparatus for efficient, precise and accurate measurement of the frequency, amplitude, and phase of a single input tone frequency and/or multiple separable input tone frequencies. Tone separability can be achieved by proper selection of the parameter N, the sample length of the DFT/FFT. Application of the invention includes but is not limited to test and measurement, tone interference removal, and communications systems, where precise and accurate measurement of tonal parameters is needed.

Abstract: An apparatus for frequency measurement (1ODMTM) which provides precise and accurate measurement of a single input tone frequency and/or multiple separable input tone frequencies. Tone separability can be achieved by proper selection of the parameter N, the sample length of the DFT/FFT.

Abstract: An apparatus for efficient, precise and accurate measurement of the frequency, amplitude, and phase of a single input tone frequency and/or multiple separable input tone frequencies. Tone separability can be achieved by proper selection of the parameter N, the sample length of the DFT/FFT. Application of the invention includes but is not limited to test and measurement, tone interference removal, and communications systems, where precise and accurate measurement of tonal parameters is needed.

Abstract: An apparatus for frequency measurement (1ODMTM) which provides precise and accurate measurement of a single input tone frequency and/or multiple separable input tone frequencies. Tone separability can be achieved by proper selection of the parameter N, the sample length of the DFT/FFT.

Abstract: An apparatus for efficient frequency measurement (JKLMTM) which provides precise and accurate measurement of a single input tone frequency and/or multiple separable input tone frequencies. Tone separability can be achieved by proper selection of the parameter N, the sample length of the DFT/FFT.

Abstract: A circuit apparatus and method for providing spectrum sensing. The invention accepts as inputs actual real-world signals in which the resulting two-dimensional output representation provides useful characteristics or features of the original time/series signal being analyzed. The invention employs both time and frequency averaging to exploit signal persistence in either domain.

Abstract: Method and apparatus for a complimentary discrete Fourier transform processor. An input signal is sampled, samples then being sequentially delayed, channelized, and processed. Synthesized outputs are provided in complimentary form. Channels are independent so as to allow for the application of gain, equalization and interference cancellation on a channel-by-channel basis. Both real and complex valued input signals may be processed. The invention optimizes computational efficiency.

Abstract: The invention disclosed herein provides a method and apparatus for analyzing periodic signals so as to determine the degree of harmonicity in real time. Harmonicity estimates are generated for each segment of a signal without the need to process subsequent segments. Harmonicity estimates can be generated in the absence of a fundamental frequency component. The invention has utility in the audio/speech domain for automated speaker identification.

Abstract: The invention disclosed herein provides a method and apparatus for analyzing periodic signals so as to determine the degree of harmonicity in real time. Harmonicity estimates are generated for each segment of a signal without the need to process subsequent segments. Harmonicity estimates can be generated in the absence of a fundamental frequency component. The invention has utility in the audio/speech domain for automated speaker identification.

Abstract: Method and apparatus for processing data sequences for the purpose of data integrity assessment, data ownership demonstration and data authentication. An input data sequence is processed to extract what could be called naturally occurring digital watermarks. More appropriately, these naturally occurring digital watermarks are referred to herein as fileprints. Fileprints are data sequences that have been extracted from the input data sequence in a repeatable manner, and are with high probability unique to that input. In this sense, a fileprint can be used to identify which data sequence it came from, just as a human fingerprint can identify a particular person to which it belongs. Because the fileprints have not been embedded, they are not actually digital watermarks. However, fileprints can be used in a like fashion to digital watermarks for information protection.

Abstract: Method and apparatus for processing data sequences for the purpose of data integrity assessment, data ownership demonstration and data authentication. An input data sequence is processed to extract what could be called naturally occurring digital watermarks. More appropriately, these naturally occurring digital watermarks are referred to herein as fileprints. Fileprints are data sequences that have been extracted from the input data sequence in a repeatable manner, and are with high probability unique to that input. In this sense, a fileprint can be used to identify which data sequence it came from, just as a human fingerprint can identify a particular person to which it belongs. Because the fileprints have not been embedded, they are not actually digital watermarks. However, fileprints can be used in a like fashion to digital watermarks for information protection.

Abstract: Apparatus and method for estimating the angle-modulation imposed on a transmitted Radio Frequency (RF) or Intermediate Frequency (IF) carrier. The method estimates angle-modulation when communications channels add distortions such as noise to transmitted signals. The system provides reconstituted frequency modulation from a feedforward demodulator. The goal is to reduce the modulation index of a desired signal and to employ a narrower band-pass filter that passes this signal while rejecting the distortion that accompanies it. A plurality of stages, 1 through M, exist within the system. Stages 2 through M contain the same components, although filter coefficients and alignment delays may differ from stage to stage. Stage 1 of the demodulator differs slightly from the remaining stages, since the only input required by Stage 1 is a complex envelope signal that contains both the desired signal and the distortion added by the channel.

Abstract: An adjustable bandwidth signal energy detector apparatus utilizing a detector processor to process serial frequency data to determine which of N frequency bins contain signal energy. The serial frequency data is processed through a series of low pass filters, each of which include a series of point delay. The data from each point delay series is summed and outputted to a detection combiner wherein a sequence of N binary number is generated.