FS#11767 - Meier crossfeed
Opened by Bertrik Sikken (bertrik) - Sunday, 21 November 2010, 11:33 GMT
Last edited by Michael Sevakis (MikeS) - Tuesday, 01 May 2012, 08:27 GMT
Attached patch adds a new crossfeed algorithm to rockbox, emulating the basic "Meier" crossfeed (2 capacitors, 3 resistors) as discussed in http://www.meier-audio.homepage.t-online.de/passivefilter.htm
This crossfeed blends a bit of low-pass filtered L signal into the R signal (and vice versa) while adding about 300 us delay to the crossfed-signal. A difference with the crossfeed already present in rockbox, is that this algorithm keeps the total spectrum flat (the one currently in rockbox accentuates low-frequency signals, making it sound a bit muffled).
This implementation is quite lightweight, just 3 multiplies per left-right pair of samples, but only has a C implementation right now (no asm).
The crossfeed effect is quite subtle and is noticeable mostly one albums that have very strong left-right separation (e.g. one instrument only on the left, another only on the right).
In the user interface, the new crossfeed option appears as "Meier" and is not configureable. The existing crossfeed is renamed to "Custom" as it allows itself to be customised.
There is no entry for the user manual yet.
Tuesday, 01 May 2012, 08:27 GMT
Reason for closing: Out of Date
Additional comments about closing: Synced to 0dd00b33 and moved to gerrit.