Other

Kenji Mogi

Akio Ichikawa

A DSP&num;B executes, prior to data conversion, interpolation (see FIG. ) in order to interpolate discrete spectra obtained via the FFT processing by a DSP&num;A . In the interpolation, the DSP&num;B executes two-point interpolation if the difference between two discrete spectrum data pieces F(j) and F(j&plus;1) is greater than a predetermined threshold &egr; and four-point interpolation if the difference is smaller than &egr;.

Data processor and data processing method for wavemeter

The CPU outputs to the delay circuit delay time setting signals for setting the delay time, based on input delay time data input from an external input device. The delay circuit re-sets the delay time via new delay setting signals input from the CPU and delays the trigger signals input from the trigger circuit based on the specified delay time and outputs the resulting signals to the clock generator The clock generator outputs new sample start signals to the A/D sampler at the input timing of the delayed trigger signals input from the delay circuit thus changing the sampling start timing of interference signals in the A/D sampler.

The DSP&num;A specifies a read address for reading digital interference signal data stored in the buffer to read the data, and executes the butterfly operation including a preset hamming windowing function coefficient to convert digital interference signal data to frequency data, then outputs the frequency data to the DSP&num;B

Growing community of inventors

Osaka, Japan

Kenji Mogi