Anritsu Corporation

Aiichi Katayama

Hitoshi Sekiya

Kenji Nakatsugawa

Mitsuyoshi Takano

Hiroyoshi Oka

Katsuhisa Iiyoshi

Takehiko Kawauchi

Kenichi Kon

Katsuhiko Kamiyama

Shoji Hiratsuka

Yoshifumi Imazu

Narushi Amamoto

Takahiro Wada

Takehiko Sato

Takafumi Nakamura

A measurement unit U100 measures an input signal to be measured by sweeping frequencies in a measurement range having a predetermined frequency band so as to obtain waveform data to be developed on the frequency axis such as spectrum data in, e.g., a spectrum analyzer. The waveform data obtained by the measurement of the measurement unit U100 is displayed by a display device 500 via a display data processor U20 included in a control unit U200 to be developed on the frequency axis of the display device, i.e., in correspondence with the measurement frequencies. The control unit U200 includes a measurement controller U30 for controlling the measurement unit U100 so as to display waveform data obtained by enlarging or reducing waveform data, before a measurement frequency condition is changed, at a predetermined magnification to have a predetermined point on the frequency axis as the center on the basis of a change in measurement frequency condition set by a condition setting unit U900, and an enlargement display/stable display processor U40 for controlling the display data processor U20. The enlargement display/stable display processor U40 realizes high-definition waveform observation, and has a function of controlling the display device U500 as the control unit U200.

Waveform display apparatus of frequency sweep type for facilitating

A measurement unit U100 measures an input signal to be measured by sweeping frequencies in a measurement range having a predetermined frequency band so as to obtain waveform data to be developed on the frequency axis such as spectrum data in, e.g., a spectrum analyzer. The waveform data obtained by the measurement of the measurement unit U100 is displayed by a display device 500 via a display data processor U20 included in a control unit U200 to be described later to be developed on the frequency axis of the display device, i.e., in correspondence with the measurement frequencies. The control unit U200 includes a measurement controller U30 for controlling the measurement unit U100 so as to display waveform data obtained by enlarging or reducing waveform data, before a measurement frequency condition is changed, at a predetermined magnification to have a predetermined point on the frequency axis as the center on the basis of a change in measurement frequency condition set by a condition setting unit U900, and an enlargement display/stable display processor U40 for controlling the display data processor U20. The enlargement display/stable display processor U40 realizes high-definition waveform observation as the gist of this invention, and substantially has a function of controlling the display device U500 as the control unit U200.

Waveform display apparatus for easily realizing high-definition waveform

A measuring unit converts a measuring signal into an intermediate frequency band of a predetermined bandwidth and detects the intermediate frequency band while a reception frequency is set variable by variably controlling a local oscillation frequency of a local oscillator. A waveform memory stores the magnitude of a detection signal output from the measuring unit in correspondence with the frequency. An analyzing unit analyzes a frequency component included in a signal to be measured, on the basis of a storage value of the waveform memory. An analysis target frequency data setting unit sets frequency data of a desired analysis target frequency or interval frequency data thereof. A sweep control unit changes the reception frequency of the measuring unit into the desired analysis target frequency corresponding to the frequency data set by the analysis target frequency data setting unit and outputs an address signal corresponding to the received analysis target frequency to the waveform memory every time a signal synchronized with an ON/OFF change of the signal to be measured is received.

Burst signal spectrum measuring system with stepwise sweeping

A spectrum analyzer comprising various components. In the analyzer, a high-frequency signal processing circuit frequency-converts an object signal including waves recurring for a short period of time, into an intermediate-frequency signal, by using a local oscillation signal swept continuously over a desired range of frequencies, and thereby outputs a frequency spectrum of the object signal. A demodulator demodulates the frequency spectrum output by the high-frequency signal processing circuit. A selection signal supplying section supplies a selection signal for selecting that portion of the spectrum output by the demodulator, which lies waves to be analyzed. A control section outputs said portion of the spectrum output by the demodulator, in accordance with the selection signal output from the selection signal supplying section. A display displays the frequency spectrum output by the control section. A sweep control section causes the high-frequency signal processing circuit to sweep the local oscillation signal repeatedly, each time for a period which is not an integral multiple of the cycle period of the selection signal.

Spectrum analyzer capable of displaying signals obtained during a

A frequency conversion section sweeps an object signal within a desired measurement frequency range, thereby frequency-converting the object signal. A peak detector detects a peak of an output from the frequency converting section. A measurement detector measures and detects the output from the frequency conversion section simultaneously with the peak detection by the peak detector. The measurement detector has an output characteristic lower than an output characteristic of the peak detector. A display displays an output from the peak detector and an output from the measurement detector on a single display screen, in synchronism with the sweeping by the frequency conversion section, with these outputs of the peak detector and the measurement detector being plotted along an axis representative of frequencies. In another mode of the invention, an alarm device indicates the fact that an output from the peak detector has exceeded a predetermined allowable limit level.

Spectrum analyzer having functions for simultaneously executing plural

Transition state detecting device and measuring device using the same

Display section displays, on a screen, a zone marker for indicating, on a wide-band spectrum display area, that part of a wide-band spectrum which corresponds to a selected narrow-band spectrum to be displayed, and the wide-band spectrum, as well as said narrow-band spectrum which has been enlarged. First setting section changes a center frequency or a band width of said displayed narrow-band spectrum, in accordance with the change of the position or width of the zone marker. Second setting section cooperating with the first setting section changes the position or width of the zone marker in accordance with the movement of the center frequency or band width of the displayed narrow-band spectrum. Control section for controlling a measurement resolution and a sweep time in accordance with the magnitude of the displayed spectrum, so as to satisfy the formula:

Waveform analyzer having function of simultaneously displaying wide- and

A timing signal generating circuit generates a timing signal for each sweep timing period. An address generating circuit generates an address corresponding to each sweep timing period and to the magnitude of the input signal, each time it receives the timing signal. An image memory stores data in the address generated by the address generating circuit. A computing unit performs, upon each receipt of the timing signal, a predetermined computation on that data stored in the image memory and generates a result of computation. The computation result represents the frequency of the same address generated for each sweep timing period. A display unit displays the input signal with a luminance level corresponding to the computation result.

Digital waveform measuring apparatus having a shading-tone display

A digital signal processing apparatus includes an A/D converter for converting an analog input signal to digital data, a memory having a plurality of memory blocks for storing the digital data, and a processor for processing digital data when read out from the memory. A first controller cyclically stores output digital data from the A/D converter in the blocks in the memory in a predetermined order and outputs the stored data to the processor every time a first command is generated by a first command generator. A second controller inhibits updating of a specific block designated by a second command generator, and outputs the data from the specific block to the processor every time a second command is generated by the second command generator.

Digital signal processing apparatus

A digital signal processing apparatus has: an A/D converter for A/D converting an input signal to be processed to a digital signal, an analog comparator for comparing the input signal with a predetermined threshold voltage and generating a comparison signal as a binary signal, a first input device for inputting at least binary data of a reference wave to be triggered, a discriminator for discriminating a coincidence between the binary signal from the analog comparator and the binary data entered at the first input device and generating a coincidence signal, a fetching section, triggered in response to the coincidence signal from the discriminator, for fetching the digital signal from the A/D converter, and a processor for performing predetermined processing of the digital signal fetched by the fetching device.

Waveform sequence trigger system

Digital wave observation apparatus includes first and second A/D converters to convert input signals of first and second channels into corresponding first and second digital signals. First and second delay circuits selectively delay the first and second digital signals, and a wave memory stores signals output from the first and second delay circuits for purposes of display. A first command device receives channel designating data corresponding to the first channel and desired delay value setting data, and provides first delay data to a first delay value setting device coupled to the first delay circuit. A second command device receives designating data corresponding to the second channel and desired delay value setting data, and provides second delay data to the first delay value setting device and a second delay value setting device coupled to the second delay circuit.

Digital wave observation apparatus

In a digital wave observation apparatus having an A/D converter for A/D converting an input signal, a trigger level setting device for setting a trigger level, a trigger signal generator for comparing the input signal with a set trigger level and generating a trigger signal, a wave memory for storing an A/D converted input signal in response to the trigger signal, and a display for displaying the input signal stored in the wave memory, the apparatus has a trigger level display device for displaying a horizontal line corresponding to a trigger level on the display irrespective of generation of the trigger signal.

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Isehara, Japan

Aiichi Katayama