On Sep 25, 2015, at 09:56 31, David Klann <[email protected]> wrote: > Which brings up the point from Aaron's original point claiming to need > to encode the audio at 192KHz. Aaron, why is it that you think you > need this high of a sample rate? 48KHz is better than CD quality which > has always been better than FM quality. Are you confusing sample rate > with compression bit-rate?
AFAICT, he’s wanting to use StereoTool to generate MPX composite, which does require 192 ksample/sec because of the ultrasonic spectral components involved (up to around 48 kHz baseband, more if the RDS encoder feature is also used). Those who have been around here for awhile may remember Dan Mills, who was one of (might have even been *the* first) original developers of this concept. IIRC, his setup involved two sound cards, each bound to a separate instance of JACK (one operating at 48 ksamples/sec for Rivendell, and another at 192 ksample/sec for the MPX generation), along with appropriate sample clock interconnection to keep both cards operating in sync. His processor talked to *both* JACK graphs. The trick as I recall was getting the two cards to clock at a precise 4:1 ratio. Not a trivial setup. I suppose you could do something similar, using JACK’s ‘dummy’ backend for the Rivendell graph, but the devil will be in getting the clocks to sync. Cheers! |----------------------------------------------------------------------| | Frederick F. Gleason, Jr. | Chief Developer | | | Paravel Systems | |----------------------------------------------------------------------| | A room without books is like a body without a soul. | | -- Cicero | |----------------------------------------------------------------------| _______________________________________________ Rivendell-dev mailing list [email protected] http://caspian.paravelsystems.com/mailman/listinfo/rivendell-dev
