Disklavier

Good morning, everyone.

I recently attended the National Pastoral Musicians Convention. At  
that convention, I met the folks from Classic Organ Works. Among  
other things, they have a product for wireless transmitting MIDI data.

Although I do not have the product myself, I would like to comment  
that it looked quite impressive. You may find out more about it at:

http://www.organworks.com/midijet/

Its advertised range is 500 feet!

Regards,
PianoBench

Hi

Get one of these and sit outside a live gig. You might even get 
yourself an "Original Artist" playing.

Midi Magic 


--- In disklavier@yahoogroups.com, "George F. Litterst" 
<PianoBench@a...> wrote:

> Good morning, everyone.
> 
> I recently attended the National Pastoral Musicians Convention. At  
> that convention, I met the folks from Classic Organ Works. Among  
> other things, they have a product for wireless transmitting MIDI data.
> 
> Although I do not have the product myself, I would like to comment  
> that it looked quite impressive. You may find out more about it at:
> 
> http://www.organworks.com/midijet/
> 
> Its advertised range is 500 feet!
> 
> Regards,
> PianoBench

On Wed, 20 Jul 2005, midi_magic2000 wrote:

> Get one of these and sit outside a live gig. You might even get
> yourself an "Original Artist" playing.


...or gain the ability to contribute to the performance.  ;)


Mark

On Wed, 20 Jul 2005, Mark A. Fontana wrote:
> On Wed, 20 Jul 2005, midi_magic2000 wrote:
>> Get one of these and sit outside a live gig. You might even get
>> yourself an "Original Artist" playing.
> ...or gain the ability to contribute to the performance.  ;)

On some of the gigs I've been playing recently I don't need wireless midi 
adapters to get people contributing to the performance - they walk right 
past the keyboards and start thumping the bottom end of the keyboard! 
Flipping drunk 18 year old school leavers! That'll teach me for playing at 
leavers balls! :-)

James

> On Wed, 20 Jul 2005, midi_magic2000 wrote:
> > Get one of these and sit outside a live gig. You might even get
> > yourself an "Original Artist" playing.
>
> ...or gain the ability to contribute to the performance.  ;)

This actually isn't possible with the MIDIjet Pro Wireless MIDI system -
the units are "bound", or "paired up" with their mate.  The receiving
unit only plays back data received from the transmitter with which it
has been bound to.

Richard Audette
Classic Organ Works (Manufacturer of MIDIjet Pro)
http://www.organworks.com/midijet/
905-475-1275

On Mon, 25 Jul 2005, richard_audette wrote:
>> On Wed, 20 Jul 2005, midi_magic2000 wrote:
>> ...or gain the ability to contribute to the performance.  ;)
> This actually isn't possible with the MIDIjet Pro Wireless MIDI system -
> the units are "bound", or "paired up" with their mate.  The receiving
> unit only plays back data received from the transmitter with which it
> has been bound to.

Richard,

This sounds really cool - does it use some form of digital signing on each 
message, or strong encryption on the data stream to prevent this?

Thanks,

James

--- In disklavier@yahoogroups.com, James Fry <groups@j...> wrote:
> This sounds really cool - does it use some form of digital signing
on each 
> message, or strong encryption on the data stream to prevent this?

It's not encryption - it's a simpler scheme.

The radio module used by MIDIjet Pro uses a "direct sequence spread
spectrum" radio interface.  DSSS generates and transmits a redundant
bit pattern for each bit to be transmitted.  So, in addition to
separating units by frequency (the 31 channels), the units are
separated by code (they can use different sets of redundant bit
patterns - sometimes called chipping codes).  

Each radio module has a unique ID.  As a part of the manufacturing
process, the receiver and transmitter are "bound" together, such that
the transmitter learns the receiver's ID.  Based on this ID, the units
coordinate with each other and pick a common chipping code.

Hence, if I go to your concert, and I have my own MIDIjet Pro
transmitter, I can't send out data to your receiver even if I'm on the
same radio channel.  My transmitter has been bound to a different
receiver, uses a different chipping code, and your receiver will not
play back the data.

Regards,
Richard Audette
Classic Organ Works
http://www.organworks.com/midijet/
905-475-1275

Hi Richard

Now I knew it was too good to be true. Thank you for your technical 
input. It stands to reason that you would not want crosstalk between 
units on stage.

Thanks
Midi Magic

> 
> It's not encryption - it's a simpler scheme.
> 
> The radio module used by MIDIjet Pro uses a "direct sequence spread
> spectrum" radio interface.  DSSS generates and transmits a redundant
> bit pattern for each bit to be transmitted.  So, in addition to
> separating units by frequency (the 31 channels), the units are
> separated by code (they can use different sets of redundant bit
> patterns - sometimes called chipping codes).  
> 
> Each radio module has a unique ID.  As a part of the manufacturing
> process, the receiver and transmitter are "bound" together, such 
that
> the transmitter learns the receiver's ID.  Based on this ID, the 
units
> coordinate with each other and pick a common chipping code.
> 
> Hence, if I go to your concert, and I have my own MIDIjet Pro
> transmitter, I can't send out data to your receiver even if I'm on 
the

> same radio channel.  My transmitter has been bound to a different
> receiver, uses a different chipping code, and your receiver will not
> play back the data.
> 
> Regards,
> Richard Audette
> Classic Organ Works
> http://www.organworks.com/midijet/
> 905-475-1275