Abstract: There is provided a method of measuring delay variation between first and second elementary streams in a digital audiovisual data stream, comprising detecting and storing digital audiovisual data stream timestamp values, detecting and storing elementary stream timestamp values for the first and second elementary streams, interpolating the digital audiovisual data stream timestamp values and elementary stream timestamp values to form data sets having mutual sampling points, and subtracting the interpolated data set for the first elementary data stream from the interpolated data set for the second elementary data stream to form elementary stream difference values indicative of changes in delay over time between first and second elementary streams.

Abstract: Constellation display allows a user to evaluate the quality of a signal under test with the constellation display even if the signal is a digital modulation signal that has many possible ideal phases. A signal analyzer 10 acquires time domain data of the signal under test that has N ideal phases. The signal analyzer 10 demodulates the signal under test to measure the phases ?m and amplitudes Am of the symbols of the signal. Phase differences d? between the ideal and measured phases of the measured symbols are calculated. K group phases ?gi are assigned to N of the ideal phases. The signal analyzer displays a constellation using phases ?gi+d? and the measured amplitudes Am. That is, points are plotted at locations of X=Am*cos (?gi+d?)+jAm*sin (?gi+d?) on a complex plane.

Abstract: Embodiments of the present invention provide a method of identifying inconsistent field order flags for a sequence of video frames comprising: for each frame in the sequence of video frames analyzing the frame to make an initial determination of the field order for that frame; averaging the initial determination of the field order over a predefined number of most recently analyzed frames; and determining those frames for which the averaged field order does not match the field order identified by a respective field order metadata item associated with each frame by comparing the averaged field order for each frame to the respective field order metadata item.

Abstract: A signal generator can control phase relationship between output signals of the channels without stopping clocks provided to the channels to enable the circuit operation fast. First and second channels 20 and 22 have signal generation blocks 10 and 12 that have clock phase shift circuits 26 and 28, memories, parallel to serial converters and DACs respectively. A phase comparator 24 compares data reading clocks from the signal generation blocks 10 and 12 to produce a phase difference signal wherein the data reading clocks are used to read waveform data from the memories within the signal generation blocks 10 and 12. A CPU controls the clock phase shift circuits 26 and 28 according to the phase difference signal to shift phases of the clocks provided to the signal generation blocks 10 and 12 and then makes phase relationship between the output signals of the first and second channels 20 and 22 as desired.

Abstract: Instinctive operation of editing parameters of waveform is provided. Tabs 38, 40 and 42 are displayed on a display screen 14 to show existence of parameter edit screen layers of different combinations of characters, waveforms and channels. If one of the tabs are selected the display is switched to show the corresponding parameter edit screen layer. Channel characters or waveforms are displayed on the tabs 38, 40 and 42 and are changed dynamically according to the setting so that a user can easily realize setting outlines of the respective channels at a glance.

Abstract: A waveform memory 66 stores data streams with each data stream having M-bit parallel data. A sequence memory 60 stores sequence information and data discard information on the amount of data to discard from the last data in each data stream. A sequencer 62 and a waveform memory controller 64 access the waveform memory 66 to provide the data streams using the sequence information. A barrel shifter 68 shifts data in the data stream according to the number of effective data of the last parallel data in the previous data stream if the number of the effective data is less than M. A data shift controller 100 generates data enables indicating whether the data in the data stream are effective or not based on the data discard information. A combiner 72 combines the effective data in the data stream using the data enables.

Abstract: A method of controlling a hibernation mode for a measurement instrument comprising a computer system and a computer system is provided. In a case that a power switch is turned off in a hibernation mode, contents of a memory of the computer system is transferred to a non-volatile storage device such as a hard disk drive unit under control of an operating system of the computer system and a power circuit of the measurement instrument is turned off. In a case that the power switch is turned on in the hibernation mode, the power circuit is turned on, the transferred contents stored in the non-volatile storage device is transferred to the memory under control of the operating system and the measurement device is initialized under control of application software and data stored in the memory.

Abstract: A user may easily confirm a relationship between an edited packet and the output serial data derived from the edited packet. The user may edit a packet with known method (step 104) to display a packet structure of the edited packet (step 106). A signal generator converts the packet to serial data through striping, scramble and 8b/10b conversion to display a serial data bar corresponding to the serial data derived from the packet (step 116). The user may designate a range on the serial data bar to distinctively display portions of the packet structure corresponding to the designated range (step 120).

Abstract: A signal analyzer provides frequency domain data at different time and frequency resolution. First type frequency domain data is derived from time domain data of a signal under test by first type frames and displayed as a spectrogram. A selecting box is displayed on the spectrogram for selecting the first type frames. The signal analyzer produces second type frequency domain data by treating the time domain data corresponding to the first type frequency domain data included in the selected first type frames with the selecting box as one frame by FFT calculation. The resultant second type frequency domain data are displayed as a spectrum that has different time and frequency resolution from the spectrogram.

Abstract: A time synchronized measurement system has a master device and a slave device. The master device and the slave device each have a time measurement device for assigning a corresponding time of sending and/or receiving a piece of measurement information. The master device also has a reference clock pulse-generating device for transmitting a reference clock signal to the slave device. The reference clock signal is modulated by a piece of information on a common time basis for the master device and the slave device.

Abstract: Power consumption of current sources in an amplifier circuit is reduced even during amplifier operation while keeping linearity of an output signal. The amplifier circuit is suitable for use in a signal generator that provides an output signal previously set by a user and having a known level. Positive and negative current sources receive an input voltage Vi depending on an output voltage Vo. An output resistor derives the output voltage Vo from currents provided by the positive and negative current sources. A variable bias generation circuit produces positive and negative bias voltages applied to the positive and negative current sources wherein the positive and negative bias voltages are set while the linearity of the output voltage is maintains using the known output level information.

Abstract: To produce data of an initial analysis range and a range zooming a part of it while updating them in parallel. [Means for resolution] A first frequency analysis range and a second frequency analysis range that is narrower than the first one are set with an operation panel 34, etc. A first signal path 171 produces first time domain data of a frequency converted signal under test according to a first data production rate that is set depending on the first frequency analysis range. A second signal path 172 produces second time domain data of frequency converted signal under test according to a second data production rate that is set depending on the second frequency analysis range and is slower than the first data production rate.

Abstract: A video classification method includes detecting pulldown video frames from within a sequence of video frames, for each video frame within said sequence identifying those frames containing inter-field motion, for each frame containing inter-field motion generating a corresponding top field and bottom field, separately correlating the generated top field with a top field of the video frame immediately previous to the frame containing inter-field motion and with a top field of the video frame immediately subsequent to the frame containing the inter-field motion, separately correlating the generated bottom field with a bottom field of the immediately previous video frame and with a bottom field of the immediately subsequent video frame and determining from the outcome of said correlations if the frame containing inter-field motion is a pulldown frame.

Abstract: The present invention relates to a method for locating at least one mobile radio subscriber in a mobile radio network. The mobile radio subscriber transmits a measurement report that includes an itemization identifying at least two transmitting stations. A value correlated with the receive field strength of a signal from the transmitting stations is allocated to each transmitting station. A table is organized according to geographic units of a presettable area. A pre-calculated value correlated with the receive field strength of a signal from a transmitting station is allocated to each transmitting station. The transmitting stations are organized according to the values correlated with the receive field strength of the signal from the respective transmitting station. The location of the mobile radio subscriber is determined based on the geographic unit meeting at least one presettable criterion.

Abstract: The present invention relates to a method for locating at least one mobile radio subscriber in a mobile radio network, wherein to each transmitting station a value correlated with the receive field strength of a signal from this transmitting station is allocated; including the following steps: a) from the information determined upon connection setup, a table is created per cell, in which at least one distance parameter to the transmitting station of the cell is allocated to the respective receive field strengths; b) for at least one value correlated with the receive field strength and transmitted in the measurement report, the allocated distance parameter to the transmitting station of the respective cell is read out from the table created in step a); and c) determining at least one point satisfying the distance parameter(s) read-out in step b).

Abstract: In order to easily understand the relationship between communication signals of a plurality of channels, a signal analyzer provides a display showing a stacked bar graph 100 that stacks powers of the plurality of channels in every time slot with the horizontal axis representing time. A marker 110 is displayed on the graph 100 and parameter information in the time slot corresponding to the display position of the marker 110 is also displayed in a table 112. If the display position of the marker 110 may change and the parameter information for the time slot is not displayed in the table 112, the display range of the parameters in the table 112 is changed in synchronism with the displayed marker position. Additionally, power related information of each channel in the time slot corresponding to the display position of the marker 110 may also be displayed in a display column 118.

Abstract: Power consumption of current sources in an amplifier circuit is reduced even during amplifier operation while keeping linearity of an output signal. The amplifier circuit is suitable for use in a signal generator that provides an output signal previously set by a user and having a known level. Positive and negative current sources receive an input voltage Vi depending on an output voltage Vo. An output resistor derives the output voltage Vo from currents provided by the positive and negative current sources. A variable bias generation circuit produces positive and negative bias voltages applied to the positive and negative current sources wherein the positive and negative bias voltages are set while the linearity of the output voltage is maintains using the known output level information.

Abstract: A signal generator can control phase relationship between output signals of the channels without stopping clocks provided to the channels to enable the circuit operation fast. First and second channels 20 and 22 have signal generation blocks 10 and 12 that have clock phase shift circuits 26 and 28, memories, parallel to serial converters and DACs respectively. A phase comparator 24 compares data reading clocks from the signal generation blocks 10 and 12 to produce a phase difference signal wherein the data reading clocks are used to read waveform data from the memories within the signal generation blocks 10 and 12. A CPU controls the clock phase shift circuits 26 and 28 according to the phase difference signal to shift phases of the clocks provided to the signal generation blocks 10 and 12 and then makes phase relationship between the output signals of the first and second channels 20 and 22 as desired.

Abstract: Fast data patterns with desired edge positions are provided. A pattern generator (PG) circuit 10 stores and provides data patterns and respective position control data. A delay circuit 16 delays a clock CLK to produce a position control clock according to the position control data. An output flip flop 18 provides the data patterns following to the position control clock. The position of the clock is controlled as an operation reference of the data pattern and, as a result, controls the edge positions of the output data pattern.

Abstract: A device and method for producing Inter Symbol Interference (ISI) scaling of S-Parameter Touchstone files for the generation of ISI scaling effects on serial data patterns by direct digital synthesis is described. The features of the present invention allow user to set parameters such as data rate, voltage amplitude, encoding scheme etc. as per requirements for the serial data patterns. An ISI scaling value is selected and applied to an S-Parameter Touchstone file representing transmission path effects. The serial data pattern parameters and the ISI scaling value used with the S-Parameter Touchstone file are compiled to generate a digital data waveform record file. The digital waveform record file is applied to a waveform generation circuit for converting the digital data into an analog serial data pattern with ISI scaling effects.