Freerails Home 
Home Search search Menu menu Not logged in - Login | Register
Freerails > Model Railroad Forums > R.C. The Future Now If You Desire > From The 'Toeffelholm' Laboratory For Weird Technology ...

Freerails IS ACCEPTING new Members ... To join Freerails ... See how to Register as a Member in the 'Joining Freerails' Forum

From The 'Toeffelholm' Laboratory For Weird Technology ...
 Moderated by: . Page:  First Page Previous Page  1  2   
New Topic Reply Printer Friendly
 Rating:  Rating
AuthorPost
 Posted: Fri Jul 12th, 2019 02:18 pm
  PMQuoteReply
11th Post
Toeffelholm
Registered


Joined: Sun Sep 21st, 2008
Location: Germany
Posts: 488
Status: 
Offline

Toeffelholm Sound Approach


Already described in Si's "The Replicant" thread, as it was inspired by his suggestions on sound equipment parts,
I want to add and proceed it here, as it fits perfectly to the "Laboratory For Weird Technology" title.
So nothing new, except the video showing ambient and loco sound together.


Basic Idea is to create a loco sound illusion in a special way,
with a sound module working "off board",
controlled by DelTang RC, in parallel with the loco.

As a little speaker inside a loco - also in my larger scale - can't reproduce the low frequency part really satisfying,
a low pass filter is used to extract the low frequencies and send them to a large speaker under the layout.

In parallel I send the loco sound signal via a Bluetooth connection to a speaker inside the loco.

As the low frequencies are difficult to localize for the human ear,
it's possible to achieve the illusion of "full sound" coming from the loco. 



The Soundbox




  • Top left is the DelTang Rx (RC receiver, motor and function controller, in plastic box), that controls a Phoenix loco sound device, bottom left. This Rx runs in parallel with the Rx in the loco, and delivers the velocity dependent control signal for the Phoenix sound card. Bell and whistle are controlled via 2 function outputs of the Rx. 
  • Left hand of the Rx is a relay as a kind of inductive load for the motor exit of the Rx. The  Phoenix doesn't work if there isn't a consumer. 
  • The speaker wires of the Phoenix sound card are connected to an impedance converter, to obtain a line-in signal.
  • From there the sound signal is fed to an audio Bluetooth transmitter (the black box in the lid), that transmits the sound to the loco, and to the low frequency filter.
  • Top right you see the low frequency filter I use. Cut off frequency can be adjusted between 22Hz and 300Hz and is has a built in pre-amplifier. ( Look for 12V low pass filter ). For playing the low frequencies I use an old guitar amp/speaker combo.
  • Above the impedance converter there is the audio potentiometer for volume control. It's connected in-between the Phoenix speaker output and the impedance converter. It is a motor-driven potentiometer. So I can fade in and out the sound when the loco enters or leaves the scene. The Volume potentiometer is controlled by a separate ESC (the little thing on the potentiometer).
  • Power supply is given by a 10Ah (nominal) power bank with an additional 12V output, via a connector at the rear side of the chest.


Transmitter (DelTang), that controls the loco as well as the sound box.





Bluetooth receiver and speaker in the motor hood





Sound box and under layout "bass" speaker





For details of the parts used, see here


Recently I added and ambient harbour sound, made for me by Jim Wells from Fantasonics.
Both together make a really satisfying illusion :moose:


Toeffelholm ambient and loco sound


Juergen




____________________
modelling in 1:22.5 on 32mm and 16.5mm track
Actual project: 7/8" scale on 45 mm track
Back To Top

 Posted: Fri Jul 12th, 2019 03:46 pm
  PMQuoteReply
12th Post
fallen
Registered
 

Joined: Wed Apr 3rd, 2013
Location: United Kingdom
Posts: 197
Status: 
Offline
Wow! That is an impressive setup you have there.

I tried something similar, but much simpler, a little while ago.
I model in 009, which is 4mm scale and narrow gauge.
The locos are quite small and so installing sound is difficult but not impossible.

However I put a speaker under the baseboard and fed it from a DC sound card,
which was a garden railway size soundcard running off the motor output of a Deltang RC receiver,
running in sync with the one on the loco.

It worked OK, but the sound card had to be reset to new parameters each time I ran a different loco.
I wonder if you have solved this with your system?

Frank


Back To Top

 Posted: Fri Jul 12th, 2019 04:23 pm
  PMQuoteReply
13th Post
Toeffelholm
Registered


Joined: Sun Sep 21st, 2008
Location: Germany
Posts: 488
Status: 
Offline
Thank you very much Frank.

Well, until a few weeks before,
the plan was "simply" to have a sound module and such a box setup for each loco.

:moose:

But recently I am intensively exploring the possibilities of the "Pricom Dreamplayer Pro",
to use it for all (recently planned 4) locos.

But this would mean, that I have to create the sound file parts from recordings by myself.
So, learning about working with "Audacity" will be my project for the next weeks.

It would have the benefit that I don't need the impedance converters,
and I would only need one low pass filter.
And I could get everything in one Box.

We will see. 


Juergen




____________________
modelling in 1:22.5 on 32mm and 16.5mm track
Actual project: 7/8" scale on 45 mm track
Back To Top

 Posted: Sun Jul 14th, 2019 02:20 am
  PMQuoteReply
14th Post
Rick Dow
Registered


Joined: Wed Nov 1st, 2017
Location: Ontario Canada
Posts: 163
Status: 
Offline
Juergen,  

As usual, all I can say is that you are amazing.

Rick   





____________________
When you come to a fork in the road - take it.... Yogi Berra
Back To Top

 Posted: Sun Jan 5th, 2020 04:28 pm
  PMQuoteReply
15th Post
Toeffelholm
Registered


Joined: Sun Sep 21st, 2008
Location: Germany
Posts: 488
Status: 
Offline
 
DelTang Multi-Switch


As I said previously,
I'm exploring the possibilities to use my own recorded loco sound files,
with a DreamPlayer Pro from Pricom.

In order to trigger the inputs of this board,
I have to apply the DelTang multi-position channel feature.

As this feature can not be programmed the conventional way,
I had to dig out my Prog4 module to set this feature in an Rx65,
using the CoolTerm Software on a MacBook.


Originally the Multi-Switch is intended to be used with a 12 position switch.
As this is nothing more but a 12-step voltage divider,
I can also use the loco throttle potentiometer for this feature,
so that I can control loco speed an under layout sound in parallel.

Here's a little example video of the Multi-Switch test.
Here the throttle controls 5 function outputs of the Rx65.
These are set to be 0V (ground) when activated.

The LED's have their anode connected to +5V,
and the cathode to one of the function outputs.

https://vimeo.com/381458813

to be continued.

Juergen




____________________
modelling in 1:22.5 on 32mm and 16.5mm track
Actual project: 7/8" scale on 45 mm track
Back To Top

 Posted: Sun Feb 9th, 2020 05:37 pm
  PMQuoteReply
16th Post
Toeffelholm
Registered


Joined: Sun Sep 21st, 2008
Location: Germany
Posts: 488
Status: 
Offline
 
Loco sound with self recorded Sounds

With the DelTang multi switch feature shown above,
and some intense learning in using Audacity audio processing software,
I'm able to use self recorded loco sounds.

The soundboard is a Dreamplayer Pro from Pricom.
It's basically a polyphonic WAV player with some control output features.
Not originally thought for loco sounds.  


I used Audacity for cutting single sound parts of different videos of the same loco,
for building loop-sections and trying to create transitions where I don't have a suitable recording.
Equalizing was used by try and error on some sound parts to make them fit better.





For the Dream Player, I extracted 5 tracks: 

1 - Start sequence followed by looped idle sound 

3 - Idle->shunting transition followed by looped shunting sound 

5 - shunting->travel transition followed by looped travel sound 

4 - travel->shunting transition followed by looped shunting sound 

2 - shunting-idle sound followed by looped idle sound 


With these I can realise a stepwise speed dependent loco sound.
Only with 3 steps, but sufficient for my anyway slow moving industrial style 2foot gauge loco.


The Dreamplayer is again controlled by a separate DelTang receiver,
(Loco: Rx62, Sound: Rx65) simultaneously controlled by the same transmitter.


I had to apply some additional electronic for the sequenced triggering.
Everything still in the test phase and will get smaller if once soldered down.
The Sound works so far as imagined. But I didn't match the loco movement up to now. 


Sound test video


Sound is coming from the loco alone at the moment, with the usual Bluetooth sound connection. 
Meanwhile I have a second better approach using a special feature of the Dreamplayer,
that makes the surrounding trigger electronic simpler. 

To be continued


Juergen




____________________
modelling in 1:22.5 on 32mm and 16.5mm track
Actual project: 7/8" scale on 45 mm track
Back To Top

 Posted: Tue Feb 11th, 2020 01:54 am
  PMQuoteReply
17th Post
bobquincy
Registered


Joined: Sun Jan 27th, 2013
Location: Florida USA
Posts: 303
Status: 
Offline
 
Great work!

I wish I could copy it, but I do not have the space for the Pricom,
so I am using an Adafruit Audio FX board.

It is only monophonic, the price we pay for smaller size.


Attempting to program level 12 of my Rx61 with an eFlite transmitter,
totally bricked the Rx61, David T was able to reset it.

Now I will use multiple channels to select my audio clips,
otherwise similar to yours: one transmitter controlling two receivers.

boB




____________________
Monorail modelers have a one track mind.
Back To Top

 Posted: Tue Feb 11th, 2020 03:12 pm
  PMQuoteReply
18th Post
Toeffelholm
Registered


Joined: Sun Sep 21st, 2008
Location: Germany
Posts: 488
Status: 
Offline
Hi Bob,

I'm glad that there is someone else who use own sounds.

As you said that you control your sound board with a separate Rx,
I assume you have it "off board" as well like me?

Why is the size/space a problem for you in this case?


A pity that Menu 12 programming doesn't work for you.
Is it an Rx61d ?  Rx61c wouldn't work for that.

Did David tell you what was wrong?


Juergen




____________________
modelling in 1:22.5 on 32mm and 16.5mm track
Actual project: 7/8" scale on 45 mm track
Back To Top

 Posted: Tue Feb 11th, 2020 05:52 pm
  PMQuoteReply
19th Post
bobquincy
Registered


Joined: Sun Jan 27th, 2013
Location: Florida USA
Posts: 303
Status: 
Offline
 
Hi Juergen

Not many monorail sounds are available,
so I get what I can online and load it into my audio board.

The front cab has the motor and controls, I put the audio in the rear cab,
as there is more space and I can use a larger speaker.

My models are about 48 mm wide, the Pricom Lite may fit,
but it does not have the individually addressable audio clips that the Adafruit board does.

I can get four outputs from one radio channel with the "< 2 second;> 2 second" method,
so with the two spare channels I should have enough outputs.

I considered programming a PIC to decode eight different pulse widths on a channel,
but got lazy.

;)

David figured I stumbled into a protected programming area,
which kept the Rx from ever binding with a transmitter, it just kept blinking.

He is really good about supporting his products!

boB




____________________
Monorail modelers have a one track mind.
Back To Top


 Current time is 12:46 pm
Page:  First Page Previous Page  1  2   

Freerails > Model Railroad Forums > R.C. The Future Now If You Desire > From The 'Toeffelholm' Laboratory For Weird Technology ...
Top



UltraBB 1.172 Copyright © 2007-2016 Data 1 Systems