The tansversal filter - The usage of the transversal filter

The following figure shows the alignment of the frontface connectors of the card:

Name of the program, and its storage place: c:\tszuro\tszuro.exe

This program can be started with the File/Run command of Windows.

Notes about the usage of the T-filter:

• The tszuro.exe program was made by students. This program has some small defences.

• After starting tszuro.exe wait, until the "ini file not correct" message appears, and the press the "ignore" button, and continue the program.

• Do not forget to set the sampling time (417 us)! Setting can be made besides the revolving button on the numeric part of the keyboard.

• The tszuro.exe does not initialize the filter coefficients after starting. Thus it may happen, that the signal given to the filter input will appear on the output of the filter, when all the coefficients are 0. We have to move the filter coefficients to the initialization, and then set them back to 0 values, until the signal did not stop on the output of the filter. It can be checked with a filtered impulse series given to the input of the filter.

• Measuring tasks can be made with the set of the T-filter to C0 = -1! Amplifier of the DSP card connected to the PC translates the phase, and thus can compensate.

• Signal processing card connected to the PC provides a very noisy signal. We can filter the noise with and RC member of 100 kohm || 100 nF connected to the input of the oscilloscope.

• Output of the signal processing card has a capacitor coupling, thus it separates the direct current coefficient of the measuring signal. It can disturb the measurement, if the DC component of the signal changes in time.

• T-filter is a sampler digital filter, so it is recommended to fulfill the sampling theorem during its usage. We should give only filtered impulse generator signals to the input of the filter!