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  1. Hello Everyone Has anyone here every tried this successfully? I'm trying to stream CD quality audio through an I2S interface directly to a Delta Sigma DAC, and out to the headphone jack. I can hear the audio through the head phones connected to the jack on the board but the audio sounds HORRIBLE. I've been told that I need to implement an interpolation filter in between the delta sigma dac and the I2S receiver and that I can't send the audio directly to the DAC? I noticed that there was a wave file project given away with the Pipistrello board, so I'm assuming that someone has tried this and gotten it to work? So here is my set up FPGA: Spartan 6 lx45 Pipistrello board External Bluetooth Chip Connected via an I2S interface CD Quality Audio Streaming at 44.1kHz 24bit data cropped to 16 bits ( LSB cropped ) 16bit data feed to the Delta Sigma DAC running at 75Mhz So, I need an interpolation filter, or so I'm told, so do we have any laying around here? Any other suggestions or solutions to this problem? Thanks in advance for all of your help.