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Hi Guys, Is it possible to defeat the pre-emphasis that the final limiting stage introduces with BBP? I run two instances of BBP one is set for hi quality full bandwidth streams on 128k mp3 & 64k aac++. The other is set for low quality (aka AM radio) type sound and frequency response. This second instance drives my 24k mp3 stream and a 64k aac++ mono feed goes to an AM TXer off site. The AM TXer over at the site has an Inovonics 222 AM Compliance limiter in front of it.
I like the peak control BBP has so I'm not keen to run BL. I also don't run the Inovonics hard at all. It's job is to roll off everything at 5khz and add the NRSC curve. Also I do it this way so there is "some" limiting when the back up music plays due to network drop out..
It's arguable that no pre-emph is needed really on streams like 128 and 64kaac++ etc. But my reason for asking is this…
The pre-emph curve that BBP is applying starts to take effect from about 800 hz and upwards. When using a stream encoded via edcast and installed as a DSP within BBP your stream always gets the de-emphed audio that is "aware" of the pre-emph curve. For what I'm doing there is double dipping going on that I'd like to stop. This is because the Inovonics 222 adds the same pre-emph curve AGAIN in how it works.
I know I "could" go back to BL and this would solve it. But BL doesn't have the peak control of BBP. But also an update for BBP with a box that says 0ms would be the answer too.
Any ideas??
You must use the output of L / R audio BPP to enter the Inovonics. This output does not have pre-emphasis.
I have understood that the DSP plugins also receive audio without prenfasis.
If you want to apply some pre-emphasis to your audio stream, you have to use the Edcast Standalone and enter the audio via the pipelines.
Regards
Holy old post bump batman.
BBP's output can have pre-emphasized, and correctly de-emphasized audio. It cannot have a fully un-emphasized output. The encoder plugin path also is always after the final pre-emphasized clipper AND with the correct de-emphasis applied to it. The minimum amount of pre-emphasis is 15 microseconds.
The peak control in the hd & streaming paths of the latest versions of Leif's Omnia products (Omnia.9, Omnia.7, Omnia.9xe, Z/IPStream 9X/2, Z/IPStream R/2) is great. It's very transparent for normal to loud audio, and if you're looking to push a codec to its limits and drive away your listeners, it'll do that with minimum impact to the sound.
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