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Re: kMIDIPropertyMaxSysExSpeed
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Re: kMIDIPropertyMaxSysExSpeed


  • Subject: Re: kMIDIPropertyMaxSysExSpeed
  • From: Doug Wyatt <email@hidden>
  • Date: Fri, 14 Sep 2001 10:22:11 -0700

On Friday, September 14, 2001, at 02:31 , Yoshiharu Honjo wrote:
Dear CoreAudio Team and the list,

I noticed the default value of kMIDIPropertyMaxSysExSpeed is
described as 3125 (Bytes/sec), on page 88 in the document "Audio
and MIDI on MacOS X" (coreaudio.pdf).

I think the correct value is 2500, as only 8 bits are utilized
for each 10-bit data (exclude a START bit and a STOP bit).
i.e.,
(31250 / (1 + 8 + 1)) * (8 / (1 + 8 + 1))
= 2500 (Bytes/sec)

Am I misunderstanding something?

MIDI is 31250 bits/second
= 3125 10-bit bytes/second
= 3125 (1 start bit + 8 data bits + 1 stop bit) bytes/second

Am *I* misunderstanding something? :-)

Doug

--
Doug Wyatt
work: email@hidden (CoreAudio)
personal: email@hidden http://www.sonosphere.com

"The most beautiful thing we can experience is the mysterious. It is the
source of all true art and all science. He to whom this emotion is a
stranger, who can no longer pause to wonder and stand rapt in awe, is
as good as dead: his eyes are closed."
--- Albert Einstein


  • Follow-Ups:
    • Re: kMIDIPropertyMaxSysExSpeed
      • From: Yoshiharu Honjo <email@hidden>
References: 
 >kMIDIPropertyMaxSysExSpeed (From: Yoshiharu Honjo <email@hidden>)

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