Subj : Re: Beginner needs help with MSB/LSB and 7bit bytes
To   : comp.programming
From : Duane Bozarth
Date : Thu Sep 29 2005 03:46 pm

Rich wrote:
> 
> Hey All,
> 
> I am trying to get my head around a particular concept. I want to write
> an editor/librarian program for my midi guitar amplifier. I have a
> description of the data pactets from the manufacturer, but I need some
> help with how the MSB affects the value of the data. Below is a bit of
> the explination from the manufacturer (This is midi sysex, which uses 7
> bit bytes):
> 
> 5E - Packed most significant bits for subsequent 7 bytes (x101 1110)
> 
> 24 - Reverb Time (6.7) using MSB 1
> 
> 56 - Reverb Dwell (4.0) using MSB 0
> 
> 7F - Reverb Diffusion (9.9) using MSB 1
> 
> 5D - Reverb Tone (8.7) using MSB 1
> 
> 5D - Modulation FX Parameter 1 (8.7) using MSB 1
> 
> 21 - Modulation FX Parameter 2 (6.6) using MSB 1
> 
> 79 - Modulation FX Parameter 3 (5.2) using MSB 0
> 
> 1D - Packed most significant bits for subsequent 7 bytes (x001 1101)
> 
> 7F - Modulation FX Parameter 4 (5.4) using MSB 0
> 
> 61 - Delay Time (510 ms) using MSB 0
> 
> I can grasp that the line saying "Packed most significant bits for
> subsequent 7 bytes" means that from right to left, the bit is the MSB
> for that byte, as they list next to byte with "using MSB 0"
> 
> But I cannot understand how the hex value 61, as in the last line can
> get to a value of 510. I mean I can translate it to binary (x110 0001),
> but I just can't see how they get 510 out of that.
> 
> remember, Im just a beginner, so I am sure I just don't understand. Any
> help would be appreciated.
> 

Looks like there's an additional level of encoding of units/encoded
value?

Seems like there needs to be another piece to the puzzle.

.