mrw wrote: > Possibly also the MSP firmware. Agreed. Although the msp430 firmware is available in the 'logitech squeezeos github repo' (https://github.com/Logitech/squeezeos/tree/public/7.8/poky/meta-squeezeos/packages/msp430/files), the license in the recipe is Confidential.
mrw wrote: > Provides an ALSA control to switch on and off. This is used by > Squeezeplay in the context of headphone jack activity to automatically > disengage when headphones are plugged in, and engage (i.e. produce mono > tweeter and woofer) when headphones are removed. Perhaps providing 2 EQ curves, one for the bass crossover and another "flat" for the headphone jack and switching between them in _setEndpoint would be enough? You can create multiple alsa equals devices with distinct settings. Eventually even an applet to change the headphone curve settings could be implemented. mrw wrote: > Presumably well optimized code implementing equalization/crossover - > would the alternatives provide adequate efficiency ? So far, my only experience has been using alsaequals on a single arm processor with fpu. This would definitely need more research. mrw wrote: > I've found those. > By courtesy of the United States NSA, I used Ghidra nine or ten months > ago to see what might be seen in the dsp plugin vis-à-vis the "bass drop > out" issue[1]. On the way, I located the various filter co-efficients. > > I have now matched these up to the relevant dsp "cook-book" algorithms > (http://www.musicdsp.org/files/Audio-EQ-Cookbook.txt) plus one other. > Results agree to the penny, or, in two cases, to within a couple of > quid[2]. > > [1] And found nothing that implicated the plugin. > [2] Which, I suspect, may stem from the use of single floats instead of > double floats when the firmware was prepared. Amazing. Knowing that you have the settings, makes researching alsaequals performance on the radio a worthwhile next step. Ralphy *1*-Touch, *5*-Classics, *3*-Booms, *1*-UE Radio 'Squeezebox client builds' (https://sourceforge.net/projects/lmsclients/files/) 'donations' (https://www.paypal.com/cgi-bin/webscr?cmd=_donations&business=LL5P6365KQEXN&lc=CA&item_name=Squeezebox%20client%20builds¤cy_code=USD&bn=PP%2dDonationsBF%3abtn_donate_SM%2egif%3aNonHosted) always appreciated. ------------------------------------------------------------------------ ralphy's Profile: http://forums.slimdevices.com/member.php?userid=3484 View this thread: http://forums.slimdevices.com/showthread.php?t=111663
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