I would like to merge both fir_low pass filter example and the audio play back example. Could anyone help?
Hi,
If you were trying to apply filter for all individual channels, then you need to split the ADC samples according to the channels. Do individual channels filter configuration before enabling ADC and DAC. And inside ProcessBuffers()function enable fir by calling adi_fir_EnableConfig() API next to adi_adau1979_SubmitBuffer() API and copy the output filter samples to DAC.
If this information is not meet your requirements means, please let us know which mode you are using TDM or I2S and also let us know how many channels you need to process filter.
Best Regards,
Santhakumari.K
Hi,
If you were trying to apply filter for all individual channels, then you need to split the ADC samples according to the channels. Do individual channels filter configuration before enabling ADC and DAC. And inside ProcessBuffers()function enable fir by calling adi_fir_EnableConfig() API next to adi_adau1979_SubmitBuffer() API and copy the output filter samples to DAC.
If this information is not meet your requirements means, please let us know which mode you are using TDM or I2S and also let us know how many channels you need to process filter.
Best Regards,
Santhakumari.K
in the ProcessBuffer how can i select a lowpass filter with 750 HZ?
Also, May I know how to generate a coefBuff .dat as well?
I need a two input two output system with a 750Hz low pass filter
Hi,
You can use MATLAB software to generate coefficients for 750Hz lowpass filter.
Before starting the filtering process, you have to convert ADC samples from fixed value to float value.
Please refer the attached example project. In this project, we have separated individual channel samples and converted from fixed value to float value. You can implement your filter algorithms here. Here we have just passed through those samples and converted from float to fix and sent to DAC channel output pins. Kindly use this as a base for your development.
Best Regards,
Santhakumari.K
Yeah, I have tried, but the program seems not continuous.
Also, could you please provide the code to generate that? And the file size 1024 fixed or not? please tell me what is the determination of the file size
You can use MATLAB software to generate coefficients for 750Hz lowpass filter.
Hi,
Please enable optimization in sharc core in the project that we shared to you. That application works fine and we are able to get clear sinewave from individual channels.
Here we have attached coefficients generated using Matlab software for 750Hz with sampling frequency as 48KHz and tap length 1024.
Best Regards,
Santhakumari.K
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Oh, Sorry for late reply, how to enable the optimization in sharc core?
Hi,
To enable optimization please follow the below steps :
Right click Project (SHARC core) > Properties > C/C++ Build > Settings > Tool Settings > Compiler > General > Enable optimization.
Also please refer the attached image for your reference.
Regards,
Santhakumari.K
