Hi,
I am using a kit which uses TMS320c5515
To be Specific : http://www.spectrumdigital.com/product_info.php?cPath=31&products_id=238
They have given an input/output Audio Jack and an expansion port for taking data into the controller. Unfortunately, I am not able to get an PCI slot for connecting the expansion port. So I thought to give the signal using the audio Jack. The signal which I am dealing with is in the range of 1Hz. only. ( I am dealing with biomedical signals). I just got a simple code which takes the input and amplifies the signal and outputs it.The code worked well with signal with >62Hz.. As the frequency of the input signal lowers, something is getting wrong and the output is not coming proper.
The audio input is taken into the processor via a codec ( is thr any issue of Low freq signal with codec ?? )
Following is the processor setting in the code
PLL frequency 100 MHz
REGISTER --- CONFIG VALUES
PLL_CNTRL1 8be8 --- 8be8
PLL_CNTRL2 080e --- 0806 Test Lock Mon will get set after PLL is up
PLL_CNTRL3 8000 --- 8000
PLL_CNTRL4 0000 --- 0000
Sampling frequency 6857 Hz Gain = 0 dBLL frequency 100 MHz
I gave the input using Matlab. A simple sine wave at different frequency sampled at 8192Hz .
Please help me out. I need to deal wil low frequency signal only.