OTOTETSU

qt sound lab.

About this app

When electric trains accelerate and decelerate, we can hear some characteristic sounds, which is caused by inverters' controlling the torque and the rotational speed of the motors.

This app simulates the waveforms generated by inverters and sounds coming from motors, and you can also design sounds of imaginary trains.

Ratings and reviews

Very nice simulation and easy to use. Suggestions: 1. Please allow the spread period of up to 200ms, so that I can recreate the Siemens Desiro UK VVVF. 2. Increase maximum speed to 500 km/h. 3. Fully customise Throttle/Brake notches. 4. Add support of DTC/DSC.

it's quite useful for VF drive enthusiasts like me to create new traction motor to the train, but otherwise it looks great, the only downside I experience (which was in new update) is the waveform acceleration, braking and cruising audio making Crackling and Popping noises that some people might complain like me, which is needed to fix a problem, other words, it needs another maintenance version which I didn't like the way crackling and popping sounds appear, otherwise, great app nevertheless!

The principle of the app is very good. It could be improved by making the waves in the sound less noticeable, and by adding DC motors.

What’s new

- The master controller can now be mounted vertically.
- You can now select the number of notches on the master controller.
- Added a feature for switching patterns automatically between acceleration and braking.
- Added support for setting the speed range for each inverter configuration using the inverter’s output frequency.