MIDI

[Marek Peca]

> No tak to tu ted zkousim, ale nejak mi to nevychazi:
> Mam tu treba (FF.51) je 645161d a vyexperimentovany vysledek je asi
> 790us/tik.
> Pritom tu mam ale FF 58 04 04 02 18 08 a tedy:
> 645161 / 24 = 26880 ale ja potrebuju mnohem min, neco kolem zminovanych 790.
> Nevite co s tim ?

Tak to nevim, uz si to nepamatuju a moje nekdejsi MIDI programy
strezi vyhorely harddisk. Nicmene, 26880/790 je neco kolem triceti,
tak me napada, jestli to tttttt neni spis v 1/32 mikrosekundy -- to
je totiz hodinova frekvence MIDI (1MHz/32 = 31250Hz).

Je tu nekdo, kdo si odpoved na tuto otazku smyslu byti a vesmiru
pamatuje?

ZdraviM.P.

> 
> ZN
> 
> 
> ----- Original Message -----
> From: "Marek Peca" <marek@tynska.cuni.cz>
> To: "HW-news" <hw-list@list.hw.cz>
> Sent: Friday, January 27, 2006 8:28 PM
> Subject: Re: MIDI
> 
> 
> Je to tady, jenom jsem slepej:
> 
> 1) Tempo
> 
> FF 51 03 tt tt tt
> 
> Indicates a tempo change. The 3 data bytes of tt tt tt are the tempo
> in microseconds per quarter note.
> 
> 2) Time Signature
> 
> FF 58 04 nn dd cc bb
> 
> Time signature is expressed as 4 numbers. nn and dd represent the
> "numerator" and "denominator" of the signature as notated on sheet
> music. The denominator is a negative power of 2: 2 = quarter note, 3
> = eighth, etc. The cc expresses the number of MIDI clocks in a
> metronome click. The bb parameter expresses the number of notated
> 32nd notes in a MIDI quarter note (24 MIDI clocks). This event allows
> a program to relate what MIDI thinks of as a quarter, to something
> entirely different. For example, 6/8 time with a metronome click
> every 3 eighth notes and 24 clocks per quarter note would be the
> following event:
> 
> FF 58 04 06 03 18 08
> 
> Jasne, takze konkretni casovy udaj musite vypocitat z tttttt a cc.
> (pocet_us_za_jednotku = tttttt/cc)
> 
> S MIDI je ale jinak krasa delat, uz se mi po tom stejska :)
> Delal jsem sqelej 32kanalovej MIDI-kontroler s AT89C2051, kterej
> misto A/D prevodniku pouzival vestavenej komparator a logaritmicky
> potenciometry na dorovnani RC exponencialy.
> 
> Ale je to masakr, kdyz krome vlastnich dat zpracovavate jeste
> prichozi odjinud, musi se davat bacha na pripadne vkladani
> prikazovejch bajtu a taky na preteceni vyrovnavaci pameti.
> 
> 
> Pekny vecer,
> Marek P.
> 
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