Re: midi- note on/off

From: Monica (leungmonica_at_yahoo.com)
Date: 09/28/04 

Date: Tue, 28 Sep 2004 23:10:58 +0800

You've mentioned this...
> If you are playing midi, then various standards such as midi file
> format contain the length of each note, and software that can read and
> play from that format will do what ever they do to make it work.

I am actually writing a S/W, which read the midi binary file.. and then
convert it to my embedded system's codec format.
that's
  Playnote(frequency, amplitude, duration){}

That means I need the duration of each note specifically. Would you
please say specifically how I can calculate the duration?

Thank you!

-Monica

Malcolm Dew-Jones wrote:
> Monica (leungmonica@yahoo.com) wrote:
> : Do anyone know about the midi protocol?
>
> : I would like to know specifically how long each note is pressed?
>
> That is not part of the midi protocol. If recording, you must measure the
> time when you receive a note on event and the time when you receive a note
> off event, and compare the two times. How to do that depends on what
> platform you are using. You don't actually have to measure the timing of
> individual notes, if you simply record the time between events then you
> can play back the original stream of events with the correct time between
> the events and the length of each note will work automatically.
>
> If you are playing midi, then various standards such as midi file format
> contain the length of each note, and software that can read and play from
> that format will do what ever they do to make it work. In that case you
> must simply format a file correctly to get the output you want.
>
> If you are playing midi event for event in your own software then you must
> figure out a way to do this yourself, though it might be easy enough if
> you are using a set of library routines cause they will provide functions
> that takes care of those details.
>
>
> : say if i receive a note on message.... then a note-off message is
> : obtained.[then how long is the note pressed?]
> : how can I calculate it?
> : Thank you!

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