Abstract: A method of determining field dominance in a sequence of video frames, the method comprising: generating from a first video frame a top field and a bottom field; interpolating the top and bottom fields to produce an interpolated top field frame and an interpolated bottom field frame respectively; correlating each of the interpolated top field frame and interpolated bottom field frame with a second video frame occurring immediately previous to the first video frame in the sequence of video frames and with a third video frame occurring immediately subsequent to the first video frame in the sequence of video frames; and determining from the outcome of the correlation the field dominance of the sequence of video frames.

Abstract: Embodiments of the present invention relate to a method of measuring a test video frame. A test video input is provided, along with an artifact measurement control, a gradient change measurement is performed based upon the test video input and a gradient change measurement map is provided.

Abstract: A method is provided to predict the location of attention focus probability trajectories due to distractions in a test video. A peripheral sensitivity probability map is created base upon a nominal measurement map, and an attention probability map, which are both based on a test video input. A focus of attention probability map with distraction is produced based upon the peripheral sensitivity map, the nominal measurement map, the attention probability map and a distractibility control input.

Abstract: Systems and methods are disclosed for correlating IP flows across a NAT firewall. Data packets are captured from a first interface using a monitor probe coupled to the first interface and are correlated into a first group of session records. For each of the first group of session records, a correlation key is created using data in one of the packets in the session record. Data packets are captured from a second interface using a monitor probe coupled to the second interface and are correlated into a second group of session records. For each of the second group of session records, a correlation key is created using data in one of the packets in the session record. The correlation key for one of the first group is compared to the correlation keys for each of the second group of session records to identify session records with matching correlation keys.

Abstract: Automatic generation of a frequency domain mask is achieved by drawing a reduced waveform representing frequency domain data for an input signal as a pixel map. The reduced waveform is blurred by applying a user selected frequency offset, and from the blurred waveform data points are selected to generate upper and lower limits. The selected upper limit data points form an upper limit mask and the lower limit data points form a lower limit mask. When the upper and lower limit data masks are combined and translated back to frequency/amplitude units from the pixel map, they form an envelope mask.

Abstract: A system and method is provided enabling identification of different PN offsets values for CDMA signals without access to a GPS signal, such as when making measurements within indoor environments. When a timing reference, such as that provided by a GPS signal, is lost, the frame boundary timestamp of the CDMA signal itself is used. The parameters of the strongest available PN offset are used. The timing error is determined and the new timing reference timestamp is estimated. The strongest PN is used as the time reference and tau is corrected for. In further embodiments, a user may be able to provide identifying information allowing the estimated timing reference timestamp to be determined even when a GPS signal was never established for providing an initial timing reference.

Abstract: This invention relates to a system and method of monitoring, by establishing end to end loopback testing across one or more networks with dissimilar transport technologies. The system allows for connection in loopback mode from a standard interface on a test device to a media adaptor located on an IP-based access network, such as a standard multimedia terminal adapter (“MTA”). End-to-End Quality of service delivered over the transmit and receive path can thus be monitored. Loopback tests are initiated from designated endpoints on the network and made operational by attaching a tag to a telephone number, to allow the gateway to signal connection mode to a call agent. The system and method overcome certain inherent limitations of the MGCP/NCS architecture.

Abstract: Picture quality measurement systems and methods are provided for measuring DC blockiness within video blocks. Block boundaries are located within a test video frame. The relative AC differences within each block are measured using a reference video frame, a statistically estimated reference or a default value of the white video level divided by two. An objective DC blockiness map, a subjective DC blockiness map or both may be generated.

Abstract: A method and apparatus are provided to measure spatial distortion. Measure and remove borders; and rescale the active test image, the active reference image, or both, such that they are the same size. A representative line is obtained, or selected, from each image providing a reference representative line (ReferenceRL) and a test representative line (TestRL). A local Pearson' cross-correlation coefficient (LPCCC) image is created from both the ReferenceRL and the TestRL at different horizontal shifts. The highest average intensity line across the LPCCC image is found as the coordinates of the corresponding Hough Transform image pixel with maximum intensity is determined. The Hough Transform Theta and R are converted to spatial scale and offset. The crude and refined offsets and scale values are combined to produce total horizontal and vertical scale offset values. These spatial measurements can then be provided.

Abstract: Apparatus and methods are provided to allow multiple, possibly overlapping, regions of interest within a frequency spectrum to be defined, and managed. Each of these regions of interest may be selected for further testing or identification. Unselected regions are allowed to collapse into narrow bars so as not to interfere with the selected region. Multiple rows are provided to allow for the definition and selection of overlapping regions of interest. Furthermore, in some embodiments aid is provided for identifying the signal type by providing a list of signal type candidates based upon such parameters as region of interest bandwidth, region of interest center frequency and geographic location.

Abstract: Embodiments of the present invention relate to a method for providing ATM cells at an interface arranged between a first and a second node of a transmission system, in an order according to ATM channels.

Abstract: An analysis display has a coordinate plane of which coordinate axes are elapsed time and PCR (Program Clock Reference) time calculated using PCR extracted from header information of a transport stream packet. A box indicator representing an access unit is provided on the coordinate plane and sides of the box indicator indicate an arrival time of the access unit AU and time of time stamps PTS/DTS. It analyzes the PCR in a transport stream layer and the time stamps PTS/DTS in a PES layer in a manner of over layers, and displays an analysis result that allows easily understanding a relationship between system timing and them. Therefore, it makes it easier to check a problem on the PCR and the time stamps PTS/DTS.

Abstract: A trigger generator and trigger method are provided for determining whether or not a signal under test matches a modulation signature. The modulation signature may be provided as a magnitude signature, a phase signature or both. When the magnitude values, phase values, or both of a signal under test are the same as their respective modulation signature, an error computation will be close to zero. If this value is within a threshold value, a trigger signal or other indication of a match is produced.

Abstract: PCR jitter is improved when writing an input stream TS having a packet with a PCR in a memory 10 and reading it at a high speed. An oscillator 44 oscillates a local clock signal having a frequency of a reference clock for the input TS and a counter 46 counts the local clock signal. When a PCR detection section 38 detects the PCR in the input TS, a latch circuit 42 latches a counted value of the counter and a PCR exchange section 40 exchanges the original PCR with a result of subtracting the latched count value from the PCR of the input TS.

Abstract: Embodiments of the present invention provide a protocol tester for performing a protocol test, said protocol tester exhibiting an input for the feeding in of data, a protocol decoding device for the decoding of data, and an output for providing the decoded data, the protocol tester also comprising a device for measuring the bit error rate. A corresponding method for performing a protocol test is also provided.

Abstract: CW lock is conducted with less manual operation. A first input 22 receives a black burst (BB) signal from a key TV station. A second input 30 receives a continuous wave (CW) signal having an accurate, known frequency. A phase adjust signal generator 24 generates a reset signal having a known phase relationship with regard to the key TV station BB signal. The reset signal is used as a phase adjust signal. A PLL 32 receives the CW signal to provide clock. A counter 34 receives the clock and provides a frame pulse signal for synchronizing the key and local TV signals at a local TV station wherein the BB signal of the local station may be derived from the frame pulse signal. The counter 34 uses the reset signal to adjust the phase relationship between the key TV station BB signal and the frame pulse to a desired phase relationship based upon the key TV station BB signal.

Abstract: A signal analyzer repetitively memorizes waveform data of a signal under test to detect peaks P1-P6 of the waveform data. Waveform widths of the waveform data at a mask reference level, or a predetermined level down from the respective peaks, are evaluated as mask reference widths and then masks of the respective peaks are set using the mask reference level and mask reference widths. Hence the masks are automatically set, so a user can easily obtain time domain data and/or frequency domain data including characterizing portions in the signal under test.

Abstract: An autocorrelation trigger comprising a correlator detector for producing a correlation coefficient by correlating a signal with a time-delayed version of the signal and generating a trigger in real-time when the correlation coefficient corresponds to a predetermined condition is provided. A method of producing trigger based upon an autocorrelation measurement is also provided. The autocorrelation trigger may be used to produce a trigger based upon the degree to which the autocorrelation relates to an autocorrelation model, such as, the degree of randomness in a signal.

Abstract: A plurality of RF signals are generated with the RF signals synchronized with each other with high accuracy. Transmission data of the multiple channels are modulated, the modulated data of the channels are added to produce composite data and the composite data is stored in a data storage device. In the modulation process, the carrier frequencies are different from each other. The composite data comprises the data of the channels modulated in the frequency division multiplexing manner. The composite data is converted into an analog composite signal by a D/A converter and this analog signal is upconverted to an RF frequency by a frequency conversion circuit. A signal separation circuit produces two channel signals from the RF frequency signal. A signal output circuit generates the output signals having desired frequencies and signal levels.

Abstract: Time variation of phase noise characteristics is displayed for measurement. A peak power of a signal under test is detected to define the frequency as a reference frequency. An offset frequency from the reference frequency is repetitively changed and each time the phase noise power is integrated for a predetermined frequency width to evaluate an integration value. The integration values are divided by the predetermined frequency width. The divided values are further divided by the peak power to evaluate noise power ratios relative to the peak power. Then, relationship between the offset frequencies, noise characteristic values and time is displayed in a graph that shows the time variation of the phase noise characteristics.