On Wed, 28 Dec 2005 22:03:48 +0000, Joerg wrote:

Hello Rich,

It seems like, no matter how closely you try to mimic the waveform of a
real instrument,...


I have a feeling that this is exactly the problem. Engineers try to
mimic the output waveform instead of looking how the real instrument is
built. If they did that, they'd try to emulate all the individual parts
and pieces.

Regards, Joerg

http://www.analogconsultants.com

Yabbut, how many gyrators and phase shifters and stuff does it take to
model, for example, a bowed string? ;-)

Thanks!
Rich

On Thu, 29 Dec 2005 01:06:02 GMT, the renowned Rich Grise
wrote:

On Wed, 28 Dec 2005 22:03:48 +0000, Joerg wrote:

Hello Rich,

It seems like, no matter how closely you try to mimic the waveform of a
real instrument,...


I have a feeling that this is exactly the problem. Engineers try to
mimic the output waveform instead of looking how the real instrument is
built. If they did that, they'd try to emulate all the individual parts
and pieces.

Regards, Joerg

http://www.analogconsultants.com

Yabbut, how many gyrators and phase shifters and stuff does it take to
model, for example, a bowed string? ;-)

Thanks!
Rich

Whatever it is, if it has to come out of speakers it isn't going to
sound quite right.


Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com

Hello Spehro,

Whatever it is, if it has to come out of speakers it isn't going to
sound quite right.


In case of a Hammond organ it might since it has a speaker. Of course,
it's a tube amp but that is a whole other matter which alone could make
this thread balloon.

It'll take a lot of gyrators and filters but considering that one can
buy a 400MHz DSP for less than a crate of beer these days it should be
feasible. In case of our piano the DSP still couldn't win. The piano
doesn't need power. Not even light since it has its own candles.

Regards, Joerg

http://www.analogconsultants.com

On Thu, 29 Dec 2005 02:13:05 GMT, the renowned Joerg
wrote:

Hello Spehro,

Whatever it is, if it has to come out of speakers it isn't going to
sound quite right.


In case of a Hammond organ it might since it has a speaker. Of course,
it's a tube amp but that is a whole other matter which alone could make
this thread balloon.

Don't some of them have rotating speakers?

It'll take a lot of gyrators and filters but considering that one can
buy a 400MHz DSP for less than a crate of beer these days it should be
feasible. In case of our piano the DSP still couldn't win. The piano
doesn't need power. Not even light since it has its own candles.

Regards, Joerg

http://www.analogconsultants.com

Sure, but can you flip a switch and be playing the flute or er-hu?


Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com

Spehro Pefhany wrote:

Don't some of them have rotating speakers?


That is a "Leslie" speaker. I have to service the one at my church.
The bearings are shot.

--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida

Hello Michael,

That is a "Leslie" speaker. I have to service the one at my church.
The bearings are shot.


If you get stuck or need a rare part talk to Bob:
http://www.tonewheel.com/services.htm

That's where I got my Hammond oil. Very friendly and helpful. His dog
was very friendly as well, he greeted me first.

Regards, Joerg

http://www.analogconsultants.com

Hello Spehro,

In case of a Hammond organ it might since it has a speaker. Of course,
it's a tube amp but that is a whole other matter which alone could make
this thread balloon.

Don't some of them have rotating speakers?


That was an accessory item, a Leslie speaker. A huge cabinet with a
rotating speaker on slide contacts, motors, gears. We don't have one and
we wouldn't know where to put it anyway. The amp under the organ is only
20W AFAIK with a huge speaker. That's real watts, not PMPS or whatever
kids call "power" these days. Meaning it can make the sound of a large
pipe organ and not lose steam after holding the bass chord for more than
a hundred milliseconds.


Sure, but can you flip a switch and be playing the flute or er-hu?


Actually you could. Ours doesn't have the flute presets but drawbars.
With these you can set the ratio of all the harmonics and the manual
shows the settings for a lot of common instruments. Some sound real,
some don't. But we also have a small environmentally friendly (zero
electric power, made from wood) flute. Not that I can play it but my
wife can.

Regards, Joerg

http://www.analogconsultants.com

"Joerg" wrote in message
...
Hello Spehro,

In case of a Hammond organ it might since it has a speaker. Of course,
it's a tube amp but that is a whole other matter which alone could make
this thread balloon.

Don't some of them have rotating speakers?

That was an accessory item, a Leslie speaker. A huge cabinet with a
rotating speaker on slide contacts, motors, gears. We don't have one and
we wouldn't know where to put it anyway. The amp under the organ is only
20W AFAIK with a huge speaker. That's real watts, not PMPS or whatever
kids call "power" these days. Meaning it can make the sound of a large
pipe organ and not lose steam after holding the bass chord for more than a
hundred milliseconds.


Sure, but can you flip a switch and be playing the flute or er-hu?

Actually you could. Ours doesn't have the flute presets but drawbars. With
these you can set the ratio of all the harmonics and the manual shows the
settings for a lot of common instruments. Some sound real, some don't. But
we also have a small environmentally friendly (zero electric power, made
from wood) flute. Not that I can play it but my wife can.

Regards, Joerg

http://www.analogconsultants.com

The Wurlitzer down at Roaring 20s Pizza and Pipes
http://www.roaring20spizza.com/ actually plays instruments like horns and
drums.

Hello James,

The Wurlitzer down at Roaring 20s Pizza and Pipes
http://www.roaring20spizza.com/ actually plays instruments like horns and
drums.


Thanks! That is one big organ. The 20HP blower motor alone speaks
volumes. I wish we had one of these somewhere in California.

Regards, Joerg

http://www.analogconsultants.com

"Joerg" bravely wrote to "All" (29 Dec 05 18:54:44)
--- on the heady topic of " 6v & 90v DC Power supply"

Jo From: Joerg
Jo Xref: core-easynews rec.radio.amateur.homebrew:90375
Jo sci.electronics.design:535390


Jo Hello Spehro,

In case of a Hammond organ it might since it has a speaker. Of course,
it's a tube amp but that is a whole other matter which alone could make
this thread balloon.

Don't some of them have rotating speakers?


Jo That was an accessory item, a Leslie speaker. A huge cabinet with a
Jo rotating speaker on slide contacts, motors, gears.

Later on the speaker didn't rotate. The speaker was mounted face up.
Covering the speaker was a rotating funnel with 2 output horns at the
apex. The dual rotating horns gave a strong Doppler Effect that was
hard to duplicate electronically. A belt turned the rotating funnel
which was driven by a variable speed motor under user control.

A*s*i*m*o*v