DSP Tools

[lindajillduan]

i ‘ve done with normalization coefficient lowpass filter design  use MATLAB. since the coefficient is normalized. and my input signal are sampled by the same sampling rate, for example the signal frequency are 40kHz, the sampling frequency are 640kHz, sampling frequency are 16,then when the signal frequency are 20kHz, the sampling frequency are 320kHz, sampling frequency are still 16.

then i thougt the filter can be used in different signal frequency, can it?

 but i noticed that FIR compiler have to specify the input sampling frequency, which makes the dout signal output in same frequency.  dose it can be used only in single frequency?

[vlavruhin]

Hello.

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i ‘ve done with normalization coefficient lowpass filter design  use MATLAB. since the coefficient is normalized. and my input signal are sampled by the same sampling rate, for example the signal frequency are 40kHz, the sampling frequency are 640kHz, sampling frequency are 16,then when the signal frequency are 20kHz, the sampling frequency are 320kHz, sampling frequency are still 16.

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Could you please clarify what is the sampling frequency that equals to 16?

[lindajillduan]

sorry , my fault. because it's a oversampling system, so 16 is the ratio of  sample frequency to signal frequency.