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Hey,
Unfortunately, the website has been removed and it will take me a couple of weeks to get the new site up since I am traveling. BUT I have attached the source and documentation to this thread. Again note that the design is for the DE1 board.
Good luck.
Bart
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Hi Bart, thanks for quick reply :) I’m designing my own LPF Using Hamming window with passband edge of 0.5Khz, sampling frequency of 10Khz. I want to demonstrate a real time filtering on audio signal on Altera’s DE2 board. To achieve that, i need to input music signal to audio codec (WM8731) through line-in input, route the signal to FPGA (my filter is downloaded in it) for signal filtering purpose and then obtained the filtered music signal out from line-out of audio codec.
I have some questions on configuring the codec chip.
Problems Encountered (Wolfson Audio Codec)
(1) Register : R1, R2, R3, R4 for Left Line In, Right Line In, Left Headphone out, Right Headphone Out respectively.
Is it good if i set the volume control to the default value?
(2) Register R5 ((Digital Audio Path Control)
I’m using my own LPF with passband edge at 0.5Khz, sampling frequency of 10Khz (downloaded to the FPGA-cycloneII). In this case, should I disable the high pass filter that wolfson codec provides? If it should be disabled, the de-emphasis control should be disabled too?
(Based on WM8731 datasheet page55, Figure 54)
Thanks a lot for you kind help :D
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