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Rockbox

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FS#9496 - Deemphasis for WM8731 disabled

Attached to Project: Rockbox
Opened by Przemysław Hołubowski (p.h.) - Thursday, 16 October 2008, 21:37 GMT
Last edited by Peter D'Hoye (petur) - Saturday, 18 October 2008, 21:58 GMT
Task Type Patches
Category Drivers
Status Closed
Assigned To No-one
Operating System All players
Severity Low
Priority Normal
Reported Version Daily build (which?)
Due in Version Undecided
Due Date Undecided
Percent Complete 100%
Votes 0
Private No

Details

The patch turns off deemphasis enabled in WM8731 driver which resulted in pronounced low-pass filtering especially in the 2-10kHz frequency range.
Turning deemphasis off still does not result in a flat frequency response in H10(*), but it seems it have to be like this because H10's OF produces exactly the same frequency response.
(*) High frequencies, starting at 4kHz, are slightly boosted. Maximum boost is for 18.4kHz and has a value of 4dB.
This task depends upon

Closed by  Peter D'Hoye (petur)
Saturday, 18 October 2008, 21:58 GMT
Reason for closing:  Accepted
Comment by Przemysław Hołubowski (p.h.) - Thursday, 16 October 2008, 21:38 GMT
The patch fixes  FS#9489 .

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