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My cellphone plays MIDI files about 3BPM slower than I made them...


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I've been doing some arrangements on SONAR on my desktop, then uploading them via Bluetooth to my cellphone.

 

I do notice that my cellphone (MOTOROLA E815) plays these MIDI ringtones perfectly... except they are noticeably slower-- about 3 BPM slower--- than I created them on the 'puter.

 

Of course, it's not the end of the world. But why do you suppose this is?

 

 

Dave "rasputin" Brooks

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The phone probably can't handle it. I had a motorolla before that would play Mp3's as the ringtone but it couldnt handle it so they started fast and slowed down... it sounded pretty cool actually. :D

 

Just make them 3bpm faster on the computer to compensate. :thu:

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3 bpm can be a big diff, particularly at, say 90 bpm, but don't forget that all crystal controlled clocks beat at a slightly different rate depending on the precision of the crystal shaving at the heart of 'tuning.' (That's why we have to use phase locked loops to attempt to synchronize the crystal controlled clocks in most conventional digital converters when we use them in multi-converter rigs.)

 

3 bpm is a lot.

 

But I've never had a crystal controlled watch or clock that was as accurate as the old Omega watch I inherited from my grandpa (an inertial self-winder, pretty high tech for 1957, but still driven by springs and gears and such). Of course, crystals can be precisely tuned, but cost increases with precision. (Imagine.)

 

Still... kind of makes you wonder how the crystal controlled RF tuning is... I guess there's some slop built in to the overall system. (That said, I've had a couple of cheap digital tuning radios that just couldn't seem to ever get on the station.)

 

 

Let's hope they put more precision into the crystal in the tuning section of the phone...

 

 

PS... let's not forget -- this can be a two way street. Your audio interface's clocking may not be all that accurate, either. A bpm and a half this way, a bpm and a half that way... pretty soon you're talking about 3 bpm.

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Actually this is a function of what is called dielectric cancellation delay, or "climatic smear," and you can fix it with some micro azimuth adjustments, which can be accessed by going to Menu>Settings>Privacy then hitting send+2+# simultaneously to launch the hidden setting screen. Select "delay test" and then "ping." if the red bar consistently goes higher than the green bar, decrement the "Az" a couple of points, or vice versa...

 

No, nope. Just made all that up, obviously. I don't know. Out.

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