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My experience is that the pira broadcast analyzer is accurate enough to sort of set the modulation, but not to verify overshoots. In fact, if you play a sine wave straight into a transmitter at 75 kHz swing, the meter will easily bounce around between 70 and 80, maybe even beyond.
///Leif
So, driving around in Thailand, I’ve been running BBP low cpu mode on my netbook in my rental car, with the headphone output (mpx out!) connected to a BW PLL+ 1 watt exciter. This is how I’m playing music in the car.. Excellent audio quality (reference settings). Tapes are so yesterday.
A 1 watt exciter creates a pretty strong signal, but occasionally there’s strong modulated noise in the background. When that happens, I usually kill the transmitter to see what’s behind — an fm station at the same frequency.. And when I do, I’m usually blasted out of the drivers seat by LOUD, distorted Thai music, easily 10dB louder than what I was playing.
I calibrated my setup before I left, to exactly 75 kHz deviation..
It’s common practice at radio stations in Thailand to run completely unprocessed into the airwaves. No processing, no nothing.. So, to be that much louder, they have to be swinging like 200 kHz on peaks. Yikes.
It’s extra fun when high frequency peaks turn to noise because the signal goes beyond the IF filter and the receiver loses lock 🙂.. This happens all the time.
These guys could really use BBP.. 🙂
///Leif
P.s. Ricardo, I will take you up on that one day!
Sounds like it could be a problem with the sound card driver. If you’re only seeing 70% cpu usage at the most, the CPU is not maxed out, so I don’t believe it’s a matter of CPU usage. You could try disabling audio realtime priority.
According to http://www.cpubenchmark.net a Pentium 4 2.4 is almost identical to an Atom N280 in performance.
The P4 gets 324 points, and the Atom N280 gets 316 points.
This is extremely impressive, I think. The Atom N280 is an *extremely* low power cpu without, and runs at just 1.66 GHz, and it’s keeping up with a P4 2.4? I’m blown away.
And on that note, I’m shutting down my server, computer and everything, and going on that road trip!
See you later, guys.
///Leif
Indeed. I’m really looking forward to hearing WHERE exactly he wants me to put that extra bass 🙂.
///Leif
Edcast is actually fixed delay, the problem is the shoutcast or icecast server, and the receiver. As far as I know there is no possible way to get fixed delay through the whole chain.
///Leif
Already done, Stuart! You can choose Low CPU mode in the I/O settings. It uses about 60% of an Atom N280.
///Leif
Guillou, possibly, but make sure not to set the bandwidth in BBP higher than the bandwidth in the encoder, as this causes overshoots and downstream clipping. If the encoder’s low pass filter is at 18000 Hz, it’s probably best to set the processor to 17500 Hz.
Parelduiker, thank you 🙂.
///Leif
Hi Dick!
Wow, that’s a new one! Breakaway in no way interferes with printers — audio and printing are completely separate things.
Please follow the troubleshooting directions in your printer manual. You may also try reinstalling the drivers. Perhaps it’s worth trying the printer on a different computer to make sure it’s not a hardware problem — printers do fail eventually.
Best regards,
///LeifKernel Streaming / WaveRT doesn’t apply to the ASIO edition. It already runs fine in Windows 7.
You’ve been able to select Left / Right MPX output from the start in the ASIO edition.17.5 kHz and 20 kHz bandwidth does apply to the ASIO version (not 18, the filters aren’t sharp enough to pull it off while protecting the pilot). However, with most customers of BBP ASIO also using RDS, this won’t do any good. So, I’m waiting until I have some other improvements to release a new ASIO version.
///Leif
I actually didn’t hear the problem with the standard settings, could you send me the exact version of the song you’re playing, along with a time inside the song where it happens?
Also, you didn’t really answer my question.. Look at the waveform — you can see that even with this adaptive bass clipper enabled, the bass on the output signal is taking up ALL the space.. It’s going all the way out to the edge..
So, if you want to more bass, where do we put it?
I mean, when I look at that oscilloscope, it looks full to me — it doesn’t look like there’s room for anything else! Or, am I missing some empty space somewhere? You know we can’t go outside the edge, that’s overmodulation. 🙂
Also, if the bass is taking up all the space already, what do we do when more treble comes in?
Best,
///LeifBAE is perfect for a 0.5 transmitter and clock radio 🙂.
It does run together with BBP if you ever need it. If you set BBP to also record from Pipeline 1, they can even process the same audio.
///Leif
